Patent Application
20250017889
The present disclosure relates to the field of biotechnology and novel compounds that inhibit the cellular activity of P-type Cu-ATPases, ATP7A and/or ATP7B. More specifically, the present disclosure relates to compositions and methods for modulating the activity of cellular copper transporters and various applications of use thereof.
ATPases play numerous roles in biological processes. P-type ATPases are a superfamily of integral membrane proteins that utilize energy derived from ATP hydrolysis to transport ions across cellular membranes. P-type ATPases are divided into five general subclasses based on the material transported, sequence similarity and overall architecture. Members of the P1B subclass of P-type ATPases are involved in the transport of transition metals and are expressed in bacteria, fungi, plants and mammals. In mammals there are two P1B-type ATPases called ATP7A and ATP7B Both ATP7A and ATP7B reside in the trans-Golgi compartment where they transport copper from the cytoplasm into the lumen of intracellular compartments of the secretory pathway including the trans-Golgi network, melanosomes, and secretory vesicles where copper is incorporated into nascent copper-dependent enzymes Copper-dependent enzymes that receive copper from ATP7A include tyrosinase, which is essential for melanogenesis; the lysyl oxidase family of enzymes, which function in collagen crosslinking in the extracellular matrix; dopamine β-hydroxylase, which converts dopamine to norepinephrine. Copper transported by ATP7B into the secretory pathway is the principal means by ceruloplasmin, a major carrier of copper in blood plasma with roles in iron homeostasis, receives its copper. Additionally, ATP7A and ATP7B are essential for maintaining whole body copper homeostasis via their copper exporting activity. ATP7A is essential for copper entry into the body by exporting dietary copper from intestinal epithelial cells into the blood ATP7A also plays a role in copper entry into the central nervous system ATP7B is essential for removing excess copper from the body via hepatobiliary excretion. Within the cytoplasm, copper is carried to the ATP7A and ATP7B proteins by ATOX1, a small cytosolic copper chaperone which binds to these transporters during copper delivery.
Copper (Cu) is an essential nutrient for all kingdoms of life and serves as a cofactor for enzymes that catalyze a diverse array of biochemical reactions. The redox properties of copper make it essential as an enzymatic cofactor. Nevertheless, excess copper is known to be cytotoxic. Consequently, cells have evolved a highly regulated network of transporters and copper-binding proteins control the distribution and homeostasis of copper. In humans, the importance of copper as an essential nutrient or as a potential cytotoxin is illustrated by genetic diseases caused by mutations in ATP7A or ATP7B. Menkes Disease is a pediatric disorder of copper deficiency caused by mutations in the gene encoding ATP7A. Menkes patients exhibit reduced absorption and tissue distribution of dietary copper, and a deficiency of copper incorporation into to copper-dependent proteins within the body. Menkes patients manifest a range of symptoms reflecting copper deficiency including severe neurological symptoms, connective tissue defects and reduced pigmentation due to loss of ATP7A-dependent copper delivery to the enzyme tyrosinase.
Wilson disease is a genetic disorder of hepatic copper overload caused by a loss of hepatobiliary copper excretion caused by mutations in the gene encoding ATP7B. The elevated hepatic accumulation of copper in Wilson patients primarily manifests as liver disease. Treatments for Wilson disease include the use of copper chelators, penicillamine or trientine, which is taken with food to block the absorption of copper in the intestine. However, such treatments may cause significant neurological deterioration in ˜30% of patients. Thus, identifying alternative treatments for Wilson disease is an important research objective.
Labrador retrievers and other dog breeds are models of Wilson disease due to a missense mutation in the canine homologue of ATP7B that confers a susceptibility to copper-associated hepatitis. Interestingly, a natural variant in the ATP7A gene that reduces ATP7A copper transport function has been identified in certain Labradors as a potential modifier of hepatic copper toxicosis this breed. Such observations provide proof of concept that a small molecule inhibitor that targets intestinal ATP7A may be therapeutic in Wilson disease by limiting dietary copper absorption.
Copper is required in higher amounts by tumor cells relative to normal cells to drive the metabolic demands of cellular proliferation. Copper levels in cancer patients and tumor-bearing animal models are significantly elevated in serum and in tumors and are correlated with poor clinical outcome and response to therapies. Recent studies have demonstrated that copper is an allosteric activator of major oncogenic kinases, including MEK1/2 and ULK1/2. Copper's unique chemistry allows it to be selectively removed from food using highly specific Cu chelators. Oral copper chelators with a clinical history in treating Wilson disease are a promising avenue of cancer treatment. A small molecule inhibitor that targets intestinal ATP7A offers an alternative means of lowering systemic copper levels in cancer patients.
Numerous studies have reported on the role of lysyl oxidases in cancer metastasis, fibrotic disease and scarring. LOX is a secreted copper-dependent amine oxidase that plays critical roles in the development of connective tissue and remodeling of the extracellular matrix by catalyzing the cross-linking of collagen. In addition to LOX, several LOX-like enzymes (LOXL1-4) have been identified that share a conserved catalytic copper-binding domain. To date, functional roles for LOX or LOXL enzymes have been documented in breast, colorectal, prostate, gastric, hepatic, pancreatic, and head and neck cancers, as well as in cancers of the skin, including melanoma. LOX and LOXL enzymes are considered major therapeutic targets for preventing tissue fibrosis and scarring. Topical application of an irreversible small molecule inhibitor of LOX and LOXL enzymes was recently shown to reduce skin scarring and fibrosis. All LOX enzymes require copper for their activity which is supplied by ATP7A during their biosynthesis in the secretory pathway. Targeted disruption of the ATP7A gene in multiple tumor cells is known to block LOX activity and suppress tumor metastasis. A small molecule inhibitor of ATP7A that blocks lysyl oxidase activity has potentially broad applications as a therapy in cancer and fibrotic diseases.
Many studies have implicated a role for ATP7A and ATP7B in the resistance to a range of clinically used chemotherapy drugs. The use of such drugs frequently leads to a loss of therapeutic efficacy due to the selection of drug resistant tumor cells in patients. Increased expression of ATP7A or ATP7B is known to confer resistance to multiple anticancer drugs including cisplatin, vincristine, paclitaxel, etoposide, doxorubicin and mitoxantron. The mechanism by these Cu-ATPases confer drug resistance is not completely understood. The chemodrugs may be directly exported from the cytoplasm by ATP7A/B. Alternatively, depletion of cellular copper levels by upregulation of ATP7A/B may increase the metabolism of these drugs. Nevertheless, targeted inhibition of ATP7A or ATP7B using a small molecule inhibitor offers a novel therapeutic strategy to suppress chemoresistance in cancer cells.
Accordingly, it is an objective of the claimed invention to provide novel compounds and pharmaceutical compositions that inhibit P1B-type copper ATPases, including ATP7A and/or ATP7B.
It is a further objective of the claimed invention to prevent and/or treat a health condition and/or disease in a subject by administering the novel compounds or pharmaceutical compositions.
It is a further objective of the claimed invention to prevent and/or treat chemotherapy resistance in a subject by administering the novel compounds or pharmaceutical compositions.
Other objects, embodiments and advantages of this disclosure will be apparent to one skilled in the art in view of the following disclosure, the drawings, and the appended claims.
The present disclosure relates to safe and effective compounds and compositions which modulate the activity of copper transporting P1B-type ATPases from any organism, including ATP7A and/or ATP7B in mammals. The compounds may be used to treat diseases or modulate copper transport and other conditions in a subject in need thereof, including any disease or biological process in which copper and/or P1B-type heavy-metal ATPases contribute.
More specifically, the disclosure provides certain small, low molecular weight compounds which inhibit the cellular activity of P1B-type Cu-ATPases. To identify said low molecular weight compounds, two molecules, MKV1 and MKV3, which share a common core scaffold, were first identified as a potential ATP7A interactor using a computer-based virtual screen. In vitro experiments later demonstrated that MKV1 and MKV3 bind to both ATP7A and ATP7B and inhibit their activities. The most potent of the two molecules, MKV3, was used to develop small, low molecular weight compounds. As disclosed below, these compounds include, but are not limited to: Formulae Ia, Ib, Ic, IIa, IIb, IIc, IIIa, IIIb, IIIc, IVa, IVb, IVc, Va, Vb, Vc, VIa, VIb, VIc, VIIa, VIIb, VIIc, VIIIa, VIIIb, VIIIc, a resonance structure thereof, and/or a pharmaceutically acceptable salt or aqueous solution or dispersion thereof. In addition, the compounds include, but are not limited to: Formulae Ia(1-3), Ib(1-3), IC(1-3), IIa(1-3), IIb(1-3), IIc(1-3), IIIa(1-3), IIIb(1-3), IIIc(1-3), IVa(1-3), IVb(1-3), IVc(1-3), Va(1-3), Vb(1-3), Vc(1-3), VIa(1-3), VIb(1-3), VIC(1-3), VIIa(1-3), VIIb(1-3), VIIc(1-3), VIIIa(1-3), VIIIb(1-3), VIIIc(1-3), a resonance structure thereof, and/or a pharmaceutically acceptable salt or aqueous solution or dispersion thereof. These compounds may inhibit P1B-type copper ATPases in different organisms, including human ATP7A and ATP7B.
In some embodiments, the herein disclosed compounds bind to an intramembraneous pocket of P1B-type copper ATPases, including ATP7A and/or ATP7B. In some embodiments, the compounds bind to the entrance of the channel of ATP7A and/or ATP7B, blocking entry of copper into ATP7A and/or ATP7B and disrupting transmembrane copper transport. In some embodiments, disrupting copper delivery via ATP7A or ATP7B inhibits the copper-dependent activity of LOX or LOXL1-4 enzymes. In other embodiments, disrupting copper export via ATP7A or ATP7B increases the sensitivity of cells to exogenous copper.
In some embodiments, competitive inhibition of the P1B-type heavy metal ATPase inhibits the copper-dependent activity of tyrosinase, thereby inhibiting melanogenesis.
In addition, the compounds may be administered to block P1B-type ATPases in microbes, thereby preventing and/or treating microbial infection or microbial resistance to silver and/or copper. In some embodiments, the compounds may be administered to augment the bactericidal or fungicidal properties of silver and copper or to prevent the development of microbial resistance to these metals.
In some embodiments, the compounds may be administered to treat a range of cancers including, but not limited to, carcinoma, blood cancers, sarcoma, mesothelioma, colorectal cancer, pancreatic cancer, head and neck cancer, skin cancer, gastric cancer, breast cancer, prostate cancer, thyroid cancer, endometrial cancer, ovarian cancer, lung cancer, hepatocellular carcinoma, kidney renal papillary cell carcinoma, esophageal cancer, pancreatic ductal adenocarcinoma.
In some embodiments, the compounds may be used to enhance the efficacy or lower the therapeutic dose of anti-cancer chemotherapy drugs, and/or to prevent or reverse resistance to anti-cancer drugs. Such drugs may include cisplatin, vincristine, paclitaxel, SN-38, etoposide, doxorubicin, mitoxantrone, and/or 7-ethyl-10-[4-(1-piperidino)-1-piperidino] carbonyloxycamptothecin (CPT-11).
In some embodiments, the compounds may be administered to treat a disease or condition with a fibrotic component, such as pulmonary fibrosis, hepatic fibrosis, kidney fibrosis, primary sclerosing cholangitis, and/or scarring of the skin or cornea. In some embodiments, the compounds may be administered to treat disorders with an underlying disturbance in copper homeostasis including Menkes disease, Wilson disease, Alzheimer's disease, Amyotrophic lateral sclerosis, Parkinson's disease, Huntington's disease; Creutzfeldt Jakob disease; MEDNIK syndrome. In other embodiments, the compounds may be administered to reduce pigmentation of the skin or to treat pigmentation disorders such as postinflammatory hyperpigmentation, melasma, solar lentigines (sun spots), ephelides (freckles), café au lait macules, vitiligo, pityriasis alba, tinea versicolor, and postinflammatory hypopigmentation.
In some embodiments the effective amount of compound is from about 10 nM to about 1 mM micromolar and the therapy may be administered by oral administration, transdermal administration, topical administration, ocular administration, sublingual administration, parenteral administration, aerosol administration, administration via inhalation, intravenous or intra-arterial administration, local administration via injection or cannula, vaginal administration, and/or rectal administration.
The compounds described herein may be used to modulate copper transport in a subject In some embodiments, the compound competitively inhibits a P1B-type heavy metal ATPase, including a P1B-type copper ATPase such as ATP7A and/or ATP7B. In some embodiments, the compound specifically binds to an intramembraneous pocket of the P1B-type copper ATPase.
While multiple embodiments are disclosed, still other embodiments will become apparent to those skilled in the art from the following detailed description, which shows and describes illustrative embodiments. Accordingly, the drawings and detailed description are to be regarded as illustrative in nature and not restrictive.
The following drawings form part of the specification and are included to further demonstrate certain embodiments. In some instances, embodiments can be best understood by referring to the accompanying figures in combination with the detailed description presented herein. The description and accompanying figures may highlight a certain specific example, or a certain embodiment. However, one skilled in the art will understand that portions of the example or embodiment may be used in combination with other examples or embodiments.
Various embodiments of the present disclosure will be described in detail with reference to the drawings, wherein like reference numerals represent like parts throughout the several views. Reference to various embodiments does not limit the scope of the disclosure. Figures represented herein are not limitations to the various embodiments according to the disclosure and are presented for exemplary illustration of the invention. An artisan of ordinary skill in the art need not view, within isolated figure(s), the near infinite number of distinct permutations of features described in the following detailed description to facilitate an understanding of the present invention.
ATP7A and ATP7B are P-type ATPases that transport copper across cell membranes. Genetic disruption of ATP7A is known to perturb copper metabolism, suppress tumor growth and metastasis, potentiate cisplatin chemotherapy, and inhibit melanin production. A small molecule inhibitor of ATP7A and/or ATP7B has potential biomedical applications in cancer, infectious disease, fibrotic scarring, Menkes disease, Wilson disease and other diseases or conditions in which copper contributes to the pathology (See
Generally, P1B-type heavy-metal ATPases are integral membrane proteins that play a key role in metal homeostasis by selectively moving heavy metals through membranes. P1B-type ATPases are highly conserved across all life forms including bacteria, plants, and animals. The ion pumps in the P-type ATPase superfamily share a common enzymatic mechanism in which ATP hydrolysis aids in transporting ions across the membrane.
P-type ATPases are a large superfamily of integral membrane proteins found in all types of living organisms that translocate a diverse set of substrates including hard metals (e.g., H+, Na+, K+, and Ca2+), soft metals (e.g., heavy metals such as Cu+, Zn2+, Cd2+), and possibly lipids. This superfamily is divided into five major branches and ten subfamilies, that differ according to the substrate being transported. All the heavy-metal pumps from bacteria, plants, and humans share significant sequence similarities and are clustered together as the P1B subfamily. P1B-type heavy-metal ATPases (HMAs) have been implicated in the transport of a range of essential as well as potentially toxic metals across cell membranes. The present disclosure contemplates inhibition of P1B-type heavy-metal ATPases in a wide range of subjects, including bacteria, plants, and humans.
HMAs directly transport copper into the body, out of the body and into metalloenzymes such as lysyl oxidase and tyrosinase. The herein disclosed HMA inhibitor compounds are contemplated to prevent or treat a wide range of diseases and conditions, including any disease in which copper or HMAs contribute to the disease pathology and any disease in which blocking copper transport is beneficial. In other embodiments, the HMA inhibitors treat or prevent metabolic diseases of copper such as Menkes disease or Wilson disease. In other embodiments, the HMA inhibitors treat or prevent cancers or augment the therapeutic efficacy of cancer treatments. In other embodiments, the HMA inhibitors treat or prevent fibrotic pathology in any tissue contributed by the activity of lysyl oxidases (LOX or LOXL1-4) such as scarring of the skin or cornea, or other fibrotic diseases such as scleroderma, rheumatoid arthritis, Crohn's disease, ulcerative colitis, myelofibrosis and systemic lupus erythematosus. Prior studies have shown that genetic deletion of ATP7A reduces angiogenesis. Thus, in another embodiment, the HMA inhibitors treat or prevent diseases associated with excess angiogenesis such as ischemic cardiovascular diseases or eye related neovascular diseases such as proliferative diabetic retinopathy, age-related macular degeneration, and retinal vein occlusion. Prior studies have shown that genetic mutations in ATP7A or ATP7B improves the pathology of mouse models of amyotrophic lateral sclerosis and Alzheimer's disease. Thus, in another embodiment, HMA inhibitors are expected to treat or prevent neurological diseases in which copper or HMAs contribute to disease pathology including amyotrophic lateral sclerosis and Alzheimer's disease.
In another embodiment, the claimed compounds inhibit growth of methicillin-resistant Staphylococcus (MRSA). Methicillin-resistant Staphylococcus aureus infection is caused by a type of Staphylococcus bacteria that has become resistant to many of the antibiotics used to treat ordinary Staphylococcus infections. MRSA infection is one of the leading causes of hospital-acquired infections and is commonly associated with significant morbidity, mortality, increased length of hospital stay, and cost burden.
In another embodiment, the claimed compounds increase the accumulation of the anti-cancer drug doxorubicin and increase the sensitivity of breast cancer cells to this drug. Recent studies have implicated ATP7A and ATP7B in the resistance to the anti-cancer drug, cisplatin (cis-diamminedichloroplatinum or DDP), which has been used in chemotherapy for various cancerous tumors, and particularly in the treatment of testicular and ovarian cancers. Cisplatin reacts with nuclear DNA and prevents normal replication which affects rapidly dividing cancer cells. Eventually, as is the case with most anticancer drugs, patients develop drug resistant cells which do not respond to this therapy. It was also reported that a higher level of ATP7B expression is often associated with tumor resistance to cisplatin. Silencing ATP7B expression was associated with decreased cell survival in the presence of cisplatin while an increase in ATP7A expression correlated with increased tumor resistance to cisplatin. ATP7A expression is also required for resistance to other chemotherapy drugs such as vincristine, paclitaxel, SN-38, etoposide, doxorubicin, mitoxantron, and 7-ethyl-10-[4-(1-piperidino)-1-piperidino]carbonyloxycamptothecin (CPT-11). Thus, in another embodiment, decreasing anti-cancer drug resistance including chemotherapy resistance (e.g., cisplatin and doxorubicin resistance) via administration of the herein described compounds is contemplated. Indeed, administration of the present compounds to a subject may lower the effective therapeutic doses of doxorubicin, cisplatin and similar anti-cancer drugs.
Notably, inhibiting the activity of the copper-transporters and other metal transporters may have implications in various treatments and therapies for ATP7A and/or ATP7B-related conditions. Reflecting copper's properties as both essential and potentially toxic, cancer cells are known to be susceptible to both copper depletion and copper excess. Drugs that lower copper concentrations (chelators) or elevate copper concentrations (ionophores) have been used in both pre-clinical and clinical cancer studies. The present compounds may be administered to block intestinal entry of copper or to enhance copper levels systemically to treat various cancers including, but not limited, to blood cancers such as leukemia, lymphoma, myeloproliferative disorder, myelodysplatic syndromes, multiple myeloma as well as solid cancers such as carcinoma, sarcoma, mesothelioma, colorectal cancer, pancreatic cancer, head and neck cancer, esophageal cancer, skin cancer, gastric cancer, breast cancer, prostate cancer, thyroid cancer, endometrial cancer, ovarian cancer, lung cancer, hepatocellular carcinoma, and/or kidney renal papillary cell carcinoma. The present compounds may be administered in combination with other therapies, or treatments that increase or decrease bioavailable copper.
In other embodiments, the present compounds may be administered to treat or prevent diseases of fibrosis in which lysyl oxidase enzymes, which require ATP7A for their activity, are known to play a role. These include pulmonary fibrosis, hepatic fibrosis, heart fibrosis, skin fibrosis, scleroderma or systemic sclerosis and/or primary sclerosing cholangitis. In other embodiments, the present compounds may be administered to block angiogenesis in neovascular diseases such as diabetic retinopathy, treat or prevent disorders of copper metabolism such as Wilson disease, to treat or prevent neurological conditions that have an underlying disruption in copper homeostasis such as Alzheimer's disease, or to reduce pigmentation and scarring of the skin.
In other embodiments, the present compounds may be used to inhibit copper transporting P-type ATPases that regulate biological processes across an array of organisms. For example, in crop plants the present compounds may be used to control fruit ripening or other processes related to the ethylene receptor which acquires copper from a P1B-type ATPase. In other embodiments, the present compounds may be used to control infections by the growing list of pathogenic organisms whose virulence is known to depend on one or more functional copper transporting P1B-type ATPases including Staphylococcus aureus, Mycobacterium tuberculosis, Acinetobacter baumannii, Salmonella typhimurium, Pseudomonas aeruginosa, Listeria Monocytogenes, Streptococcus pneumoniae, Leishmania major, Plasmodium berghei and Botrytis cinerea. Examples include the control of Staphylococcus aureus (MRSA) infections as a topical treatment to augment the antibiotic properties of silver and copper used in wound care.
So that the present disclosure may be more readily understood, certain terms are first defined. Unless otherwise defined herein, scientific and technical terms used in connection with the present disclosure shall have the meanings that are commonly understood by those of ordinary skill in the art. Further, unless otherwise required by context, singular terms shall include pluralities and plural terms shall include the singular. Generally, nomenclature used in connection with, and techniques of, cell and tissue culture, molecular biology, immunology, microbiology, genetics and protein and nucleic acid chemistry and hybridization described herein are those well-known and commonly used in the art. The methods and techniques of the present disclosure are generally performed according to conventional methods well-known in the art and as described in various general and more specific references that are cited and discussed throughout the present specification unless otherwise indicated. The nomenclature used in connection with, and the laboratory procedures and techniques of, analytical chemistry, synthetic organic chemistry, and medicinal and pharmaceutical chemistry described herein are those well-known and commonly used in the art.
It is to be understood that all terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting in any manner or scope. For example, as used in this specification and the appended claims, the singular forms “a,” “an” and “the” are used interchangeably and can include plural referents unless the content clearly indicates otherwise. Also, as used herein, “and/or” refers to and encompasses any and all possible combinations of one or more of the listed items, as well as the lack of combinations when interpreted in the alternative (“or”). Further, all units, prefixes, and symbols may be denoted in its SI accepted form.
Numeric ranges recited within the specification are inclusive of the numbers defining the range and include each integer within the defined range. Throughout this disclosure, various embodiments of this disclosure are presented in a range format. It should be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the disclosure. Accordingly, the description of a range should be considered to have specifically disclosed all the possible sub-ranges, fractions, and individual numerical values within that range. For example, description of a range such as from 1 to 6 should be considered to have specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6 etc., as well as individual numbers within that range, for example, 1, 2, 3, 4, 5, and 6, and decimals and fractions, for example, 1.2, 3.8, 1½, and 4¾. This applies regardless of the breadth of the range.
As used herein, the term “about,” refers to variation in the numerical quantity that can occur, for example, through typical measuring techniques and equipment, with respect to any quantifiable variable, including, but not limited to, mass, amount of substance, volume, time, length, diameter, percent, quantity, and concentration. Further, given solid and liquid handling procedures used in the real world, there is certain inadvertent error and variation that is likely through differences in the manufacture, source, or purity of the ingredients used to make the compositions or carry out the methods and the like. The term “about” also encompasses these variations. Whether or not modified by the term “about,” the claims include equivalents to the quantities.
All numerical designations, e.g., pH, temperature, time, concentration, and molecular weight, including ranges, are approximations which are varied (+) or (−) by increments of 0.1. It is to be understood, although not always explicitly stated that all numerical designations are preceded by the term “about”. The term “about” also includes the exact value “X” in addition to minor increments of “X” such as “X+0.1” or “X−0.1.” It also is to be understood, although not always explicitly stated, that the reagents described herein are merely exemplary and that equivalents of such are known in the art.
The terms “administration of” or “administering” an active agent should be understood to mean providing an active agent to the subject in need of treatment in a form that can be introduced into that individual's body in a therapeutically useful form and therapeutically effective amount.
The term “analog” as used herein refers to a molecular derivative of a molecule. The term is synonymous with “structural analog” or “chemical analog.”
As used herein, the term “comprising” is intended to mean that the compositions and methods include the recited elements, but not excluding others. “Consisting essentially of” when used to define compositions and methods, shall mean excluding other elements of any essential significance to the composition or method. “Consisting of” shall mean excluding more than trace elements of other ingredients for claimed compositions and substantial method steps. Embodiments defined by each of these transition terms are within the scope of this disclosure. Accordingly, it is intended that the methods and compositions can include additional steps and components (comprising) or alternatively including steps and compositions of no significance (consisting essentially of) or alternatively, intending only the stated method steps or compositions (consisting of).
As used herein, “competitive inhibition” refers to the interruption of a chemical pathway owing to one chemical substance inhibiting the effect of another by competing with it for binding or bonding. Any metabolic or chemical messenger system can potentially be affected by this principle, but several classes of competitive inhibition are especially important in biochemistry and medicine, including the competitive form of enzyme inhibition, the competitive form of receptor antagonism, the competitive form of antimetabolite activity, and the competitive form of poisoning. Relatedly, a receptor antagonist is a type of receptor ligand or drug that blocks or dampens a biological response by binding to and blocking a receptor rather than activating it like an agonist. Antagonist drugs interfere in the natural operation of receptor proteins and are sometimes referred to as “blockers”. In competitive inhibition of enzyme catalysis, binding of an inhibitor prevents binding of the target molecule of the enzyme, also known as the substrate. This is accomplished by blocking the binding site of the substrate (e.g., the “active site”) by some means.
As used herein, “condition” or “health condition” refers to an ex vivo, in vivo, or in cellulo state of a subject or organism. A health condition may relate to, for example, the presence of health-related microorganisms in a given location. In the present context, heavy metal transporters are ubiquitous in nature, and therefore the claims contemplate modulation of metal ion transport in a wide variety of contexts including application to the in vivo and ex vivo killing or modulation of bacteria, fungus, and viruses. The range of subject animal species that may suffer from a health condition is also very broad, including humans, domesticated animals, farm animals, and aquatic invertebrates. Notably, health conditions can include diseases, infections, and any metal ion homeostatic condition.
As used herein, “disease” refers to a condition of a living animal or plant body or of one of its parts that impairs normal functioning and is typically manifested by distinguishing signs and symptoms. Diseases may include bacterial infections, viral infections, resistant viral and bacterial infections, genetic disorders, cancers, any conditions that involve a copper homeostatic component, and other harmful health conditions known in the art.
As used herein, “resonance” refers to the bonding in a molecule or compound where there can be variations or combinations of several contributing structures in a resonance hybrid according to valence bonding theory. As referred to herein, resonance structures can have delocalized electrons in some molecules where bonding is not expressed by a single structure, such that contributing structures can differ by the position of delocalized electrons.
As used herein, “transporter” or “heavy metal transporter” refers to any protein or enzyme that transports metal ions. This definition also encompasses P1B-type copper ATPases such as ATP7A and/or ATP7B.
As used herein, “therapeutically effective amount” refers to the amount of a compound or pharmaceutical composition administered to improve, inhibit, or ameliorate a condition of a subject, or a symptom of a disorder, in a clinically relevant manner. Any improvement in the subject is considered sufficient to achieve treatment. In some embodiments, a therapeutically effective amount is an amount that prevents or reduces the likelihood of tumor metastasis in a statistically significant way. In some embodiments, a therapeutically effective amount is an amount that prevents or reduces the occurrence or one or more symptoms of a pathology, or is an amount that reduces the severity of, or the length of time during which a subject suffers from, one or more symptoms of the pathology (for example, by at least 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 99%, or more, relative to a control subject that is not treated with the compound or pharmaceutical composition). Moreover, the “therapeutically effective amount” will vary depending on the particular compound or pharmaceutical composition administered, on the severity of the condition being treated, individual patient parameters including age, physical condition, size and weight, concurrent treatment, frequency of treatment, and the mode of administration. These factors are well known to those of ordinary skill in the art and can be addressed with no more than routine experimentation.
As used herein, “pharmaceutically acceptable” refers to those compounds, materials, compositions, and/or dosage forms which are, within the scope of sound medical judgment, suitable for use in contact with the tissues, organs, and/or bodily fluids of human beings and animals without excessive toxicity, irritation, allergic response, or other problems or complications commensurate with a reasonable benefit/risk ratio.
As used herein, a “pharmaceutically acceptable carrier” refers to, and includes, any and all solvents, dispersion media, coatings, antibacterial and antifungal agents, isotonic and absorption delaying agents, and the like that are physiologically compatible. The compositions can include a pharmaceutically acceptable salt, e.g., an acid addition salt or a base addition salt.
As used herein, “treating” or “treatment” of a state, disorder or condition includes: (1) preventing or delaying the appearance of clinical symptoms of the state, disorder or condition developing in a subject that may be afflicted with or predisposed to the state, disorder or condition but does not yet experience or display clinical or subclinical symptoms of the state, disorder or condition, (2) inhibiting the state, disorder or condition, i.e., arresting or reducing the development of the disease or at least one clinical or subclinical symptom thereof, or (3) relieving the disease, i.e., causing regression of the state, disorder or condition or at least one of its clinical or subclinical symptoms. The benefit to a subject to be treated is either statically significant or at least perceptible to the patient or to the physician.
As used herein, “subject” refers to the living organism to which the herein disclosed compounds are administered. In the present context, potential subjects are ubiquitous in nature, including any living organism, including plants, fungi, protists, bacteria, and animals. The range of animal species that may comprise subjects is very broad and includes, for example, humans, domesticated animals, farm animals, aquatic vertebrates, and aquatic invertebrates.
Compounds that competitively inhibit a P1B-type heavy metal ATPase include the following formulae:
or absent;
Compounds that competitively inhibit a P1B-type heavy metal ATPase preferably include the following formulae Ia, Ib, Ic, IIa, IIb, IIc, IIIa, IIIb, IIIc, IVa, IVb, IVc, Va, Vb, Vc, VIa, VIb, VIc, VIIa, VIIb, VIIc, VIIIa, VIIIb, VIIIc:
or absent;
The compounds can also include resonance structures, such as shown in the following formulae Va:
or absent;
Additional examples of resonance structures are shown with exemplary formulae VIIa, VIIb, VIIIa, and VIIIb:
or absent;
In additional embodiments the compound of Formula Ia, Ib, or Ic is one of the following formulae:
or absent;
In additional embodiments the compound of Formula IIa, IIb, or IIc is one of the following formulae:
or absent;
In additional embodiments the compound of Formula IIIa, IIIb, IIIc, IVa, IVb, or IVc is one of the following formulae:
or absent;
In additional embodiments the compound of Formula Va, Vb, Vc, VIa, VIb, VIc, VIIa, VIIb, VIIc, Villa, VIIIb, or VIIIc is one of the following formulae
or absent;
In additional embodiments the compound of any one of Formulae Ia, Ib, Ic, IIa, IIb, IIc, IIIa, IIIb, IIIc, IVa, IVb, IVc, Va, Vb, Vc, VIa, VIb, VIc, VIIa, VIIb, VIIc, VIIIa, VIIIb, VIIIc, a resonance structure thereof, or a pharmaceutically acceptable salt or aqueous solution or dispersion thereof, has the formula wherein R1 is a hydroxyl and R2 and R3 are each F, Br, Cl, or I, wherein X1, X2, and X3 is hydrogen, Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent.
In additional embodiments the compound of any one of Formulae Ia, Ib, Ic, IIa, IIb, IIc, IIIa, IIIb, IIIc, IVa, IVb, IVc, Va, Vb, Vc, VIa, VIb, VIc, VIIa, VIIb, VIIc, VIIIa, VIIIb, VIIIc, a resonance structure thereof, or a pharmaceutically acceptable salt or aqueous solution or dispersion thereof, has the formula wherein R3 is a hydroxyl and R1 and R2 are each F, Br, Cl, or I, wherein X1, X2, and X3 is hydrogen, Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent.
In additional embodiments the compound of any one of Formulae Ia, Ib, Ic, IIa, IIb, IIc, IIIa, IIIb, IIIc, IVa, IVb, IVc, Va, Vb, Vc, VIa, VIb, VIc, VIIa, VIIb, VIIc, VIIIa, VIIIb, VIIIc, a resonance structure thereof, or a pharmaceutically acceptable salt or aqueous solution or dispersion thereof, has the formula wherein each of R1, R2, and R3 is independently F, Br, Cl, I, hydrogen, or absent, wherein X1, X2, and X3 is independently hydrogen, Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent.
In additional embodiments the compound of any one of Formulae Ia, Ib, Ic, IIa, IIb, IIc, IIIa, IIIb, IIIc, IVa, IVb, IVc, Va, Vb, Vc, VIa, VIb, VIc, VIIa, VIIb, VIIc, VIIIa, VIIIb, VIIIc, a resonance structure thereof, or a pharmaceutically acceptable salt or aqueous solution or dispersion thereof, has the formula wherein R2 is
and R1 and R3 are each F, Br, Cl, or I, wherein X1, X2, X3 is hydrogen, Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent.
In additional embodiments the compound of any one of Formulae Ia, Ib, Ic, IIa, IIb, IIc, IIIa, IIIb, IIIc, IVa, IVb, IVc, Va, Vb, Vc, VIa, VIb, VIc, VIIa, VIIb, VIIc, VIIIa, VIIIb, VIIIc, a resonance structure thereof, or a pharmaceutically acceptable salt or aqueous solution or dispersion thereof, has the formula wherein R1 or R3 is-NH2, wherein X1, X2, and X3 is hydrogen, Cl, Br, F, I, O, or C—O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent.
In additional embodiments the compound of any one of Formulae Ia(1-3), Ib(1-3), or Ic(1-3) has the formula wherein: (i) R1 is a hydroxyl and R2 and R3 are each F, Br, Cl, or I, wherein X is Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent; (ii) R3 is a hydroxyl and R1 and R2 are each F, Br, Cl, or I, wherein X is Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent; (iii) each of R1, R2, and R3 is F, Br, Cl, I, hydrogen, or absent, wherein X is Cl, Br, F, I, O, or C—O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent; (iv) R2 is
and R1 and R3 are each F, Br, Cl, or I, wherein X is Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent; or (v) R1 or R3 is —NH2, wherein X is Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent.
In additional embodiments the compound of any one of Formulae IIa(1-3), IIb(1-3) or IIc(1-3) has the formula wherein: (i) R1 is a hydroxyl and R2 and R3 are each F, Br, Cl, or I, wherein X is Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent; (ii) R3 is a hydroxyl and R1 and R2 are each F, Br, Cl, or I, wherein X is Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent; (iii) each of R1, R2, and R3 is F, Br, Cl, I, hydrogen, or absent, wherein X is Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent; (iv) R2 is
and R1 and R3 are each F, Br, Cl, or I, wherein X is Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent; or (v) R1 or R3 is-NH2, wherein X is Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent.
In additional embodiments the compound of any one of Formulae IIIa(1-3), IIIb(1-3), IIIc(1-3), IVa(1-3), or IVb(1-3) has the formula wherein: (i) R1 is a hydroxyl and R2 and R3 are each F, Br, Cl, or I, wherein X is Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent; (ii) R3 is a hydroxyl and R1 and R2 are each F, Br, Cl, or I, wherein X is Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent; (iii) each of R1, R2, and R3 is F, Br, Cl, I, hydrogen, or absent, wherein X is Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent; (iv) R2 is
and R1 and R3 are each F, Br, Cl, or I, wherein X is Cl, Br, F, I, O, or C—O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent; or (v) R1 or R3 is —NH2, wherein X is Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent.
In additional embodiments the compound of any one of Formulae Va(1-3), Vb(1-3), Vc(1-3), VIa(1-3), VIb(1-3), VIC(1-3), VIIa(1-3), VIIb(1-3), VIIc(1-3), VIIIa(1-3), VIIIb(1-3), VIIIc(1-3), has the formula wherein: (i) R1 is a hydroxyl and R2 and R3 are each F, Br, Cl, or I, wherein X is Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent; (ii) R3 is a hydroxyl and R1 and R2 are each F, Br, Cl, or I, wherein X is Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent; (iii) each of R1, R2, and R3 is F, Br, Cl, I, hydrogen, or absent, wherein X is Cl, Br, F, I, O, or C—O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent; (iv) R2 is
and R1 and R3 are each F, Br, Cl, or I, wherein X is Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent; or (v) R1 or R3 is —NH2, wherein X is Cl, Br, F, I, O, or C═O, wherein X4, X5, X6, and X7 individually are C or N, and wherein Y is HC≡N, CH3, CH3—CH4, C═O, hydrogen or absent.
According to an embodiment, a pharmaceutical composition is provided. A pharmaceutical composition according to the present disclosure includes a compound that competitively inhibit a P1B-type heavy metal ATPase as described herein and a pharmaceutically acceptable carrier.
By “pharmaceutical composition” the inhibitor(s) of P1B-type heavy metal ATPase of the present disclosure provide the therapeutically or biologically active agent for formulation into a suitable delivery means for administration to a subject. For the purposes of this invention, pharmaceutical compositions suitable for delivering the inhibitor(s) of P1B-type heavy metal ATPase can include, e.g., tablets, gel caps, capsules, pills, powders, granulates, suspensions, emulsions, solutions, gels, hydrogels, oral gels, pastes, eye drops, ointments, creams, plasters, drenches, delivery devices, suppositories, enemas, injectables, implants, sprays, or aerosols. Any of the aforementioned formulations can be prepared by well-known and accepted methods of art.
In an aspect, the pharmaceutical compositions comprise at least one of the inhibitors of P1B-type heavy metal ATPase and a pharmaceutically acceptable carrier or excipient. Examples of suitable pharmaceutically acceptable carriers or excipients that can be used in said pharmaceutical compositions include, but are not limited to, sugars (e.g., lactose, glucose or sucrose), starches (e.g., corn starch or potato starch), cellulose or its derivatives (e.g., sodium carboxymethyl cellulose, ethyl cellulose or cellulose acetate), oils (e.g., peanut oil, cottonseed oil, safflower oil, sesame oil, olive oil, corn oil or soybean oil), glycols (e.g., propylene glycol), buffering agents (e.g., magnesium hydroxide or aluminum hydroxide), agar, alginic acid, powdered tragacanth, malt, gelatin, talc, cocoa butter, pyrogen-free water, isotonic saline, Ringer's solution, ethanol, phosphate buffer solutions, lubricants, coloring agents, releasing agents, coating agents, sweetening, flavoring or perfuming agents, preservatives, or antioxidants.
The term “excipient” refers to additives and stabilizers typically employed in the art (all of which are termed “excipients”), including for example, buffering agents, stabilizing agents, preservatives, isotonifiers, non-ionic detergents, antioxidants and/or other miscellaneous additives. Stabilizers refer to a broad category of excipients which can range in function from a bulking agent to an additive which solubilizes the inhibitor of P1B-type heavy metal ATPase or helps to prevent denaturation of the same. Additional conventional excipients include, for example, fillers (e.g., starch), chelating agents (e.g., EDTA), antioxidants (e.g., ascorbic acid, methionine, vitamin E) and cosolvents.
The term “carrier” refers to a diluent, adjuvant, excipient, or vehicle with which the pharmaceutical composition is administered. Such pharmaceutical carriers are illustratively sterile liquids, such as water and oils, including those of petroleum, animal, vegetable or synthetic origin, such as peanut oil, soybean oil, mineral oil, sesame oil and the like. Water is a preferred carrier when the pharmaceutical composition is administered intravenously. Saline solutions and aqueous dextrose and glycerol solutions are optionally employed as liquid carriers, particularly for injectable solutions. Suitable pharmaceutical excipients include starch, glucose, lactose, sucrose, gelatin, malt, rice, flour, chalk, silica gel, sodium stearate, glycerol monostearate, talc, sodium chloride, dried skim milk, glycerol, propylene, glycol, water, ethanol and the like. The composition, if desired, also contains wetting or emulsifying agents, or pH buffering agents. These compositions optionally take the form of solutions, suspensions, emulsion, tablets, pills, capsules, powders, sustained release formulations and the like. The composition is optionally formulated as a suppository, with traditional binders and carriers such as triglycerides. Oral formulation illustratively includes standard carriers such as pharmaceutical grades of mannitol, lactose, starch, magnesium stearate, sodium saccharine, cellulose, magnesium carbonate, etc.
Pharmaceutical compositions according to the disclosure may be formulated to release the composition immediately upon administration (e.g., targeted delivery) or at any predetermined time period after administration using controlled or extended release formulations. Administration of the pharmaceutical composition in controlled or extended release formulations is useful where the composition, either alone or in combination, has (i) a narrow therapeutic index (e.g., the difference between the plasma concentration leading to harmful side effects or toxic reactions and the plasma concentration leading to a therapeutic effect is small; generally, the therapeutic index, TI, is defined as the ratio of median lethal dose (LD50) to median effective dose (ED50)); (ii) a narrow absorption window in the gastro-intestinal tract; or (iii) a short biological half-life, so that frequent dosing during a day is required in order to sustain a therapeutic level. One skilled in the art will ascertain compositions for controlled or extended release of the pharmaceutical composition. In an aspect, controlled release can be obtained by controlled release compositions and coatings which are known to those of skill in the art.
Methods for Preventing and/or Treating a Health Condition and/or Disease in a Subject
In an aspect, methods for preventing and/or treating a health condition and/or disease in a subject in need thereof are provided. In an embodiment, the method comprises administering a therapeutically effective amount of an inhibitor of a heavy metal transporter to the subject. In some embodiments, the inhibitor of the heavy metal transporter comprises an inhibitor of ATP7A and/or ATP7B.
In an embodiment, the method comprises administering to the subject a therapy comprising a therapeutically effective amount of the compounds described herein. In an embodiment, the method comprises administering to the subject a pharmaceutical composition comprising the compound and a pharmaceutically acceptable carrier.
In some embodiments, the compound administered to the subject competitively inhibits a P1B-type heavy metal ATPase. The P1B-type heavy metal ATPase may comprise a P1B-type copper ATPase. In an embodiment, the compound specifically binds to an intramembraneous pocket of P1B-type copper ATPase. In a further embodiment, the P1B-type copper ATPase is ATP7A and/or ATP7B, and the administered compound competitively inhibits ATP7A and/or ATP7B by blocking entry of copper into ATP7A and/or ATP7B. In some embodiments, the compound disrupts transmembrane copper transport.
In some embodiments, competitive inhibition of ATP7A and/or ATP7B disrupts delivery of copper to at least one lysyl oxidase (LOX), thereby inhibiting activity of the at least one LOX. In an embodiment, competitive inhibition of ATP7A comprises inhibition of LOX or LOXL1-4 enzyme activity in cancer cells, thereby suppressing cancer tumorigenesis, cancer cell migration, and cancer cell metastasis in the subject.
In some embodiments, competitive inhibition of ATP7A and/or ATP7B inhibits the copper-dependent activity of the tyrosinase enzymes, thereby inhibiting melanogenesis (See
In some embodiments, the therapeutically effective amount of the compound or the pharmaceutical composition is from about 10 nM to about 1 mM. In some embodiments, the therapeutically effective amount of the compound or the pharmaceutical composition is from about 10 nM to about 500 μM, from about 10 nM to about 400 μM, from about 10 nM to about 300 μM, from about 10 nM to about 200 μM, from about 10 nM to about 150 μM, from about 10 nM to about 100 μM, from about 10 nM to about 500 nM, or any range therein.
Dose ranges can be adjusted as necessary for the treatment of individual patients and according to the specific condition treated and the type of delivery for the administration of the compositions. Any of a number of suitable pharmaceutical formulations may be utilized as a vehicle for the administration of the compositions of the present disclosure and maybe a variety of administration routes are available. The particular mode selected will depend of course, upon the particular formulation selected, the severity of the disease, disorder, or condition being treated, and the dosage required for therapeutic efficacy. The methods of this disclosure, generally speaking, may be practiced using any mode of administration that is medically acceptable, meaning any mode that produces effective levels of the active compounds without causing clinically unacceptable adverse effects. Such modes of administration include oral, rectal, topical, nasal, transdermal or parenteral routes and the like. Accordingly, the formulations of the invention include those suitable for oral, rectal, topical, buccal, parenteral (e.g., subcutaneous, intramuscular, intradermal, inhalational or intravenous) and transdermal administration, although the most suitable route in any given case will depend on the nature and severity of the condition being treated and on the nature of the particular active product used.
In an embodiment, the therapy is administered by a variety of administration methods, including, but not limited to, oral administration, transdermal administration, topical administration, ocular administration, sublingual administration, parenteral administration, aerosol administration, administration via inhalation, intravenous or intra-arterial administration, local administration via injection or cannula, vaginal administration and/or rectal administration.
In general, the formulations of the disclosure are prepared by uniformly and intimately mixing the active compound with a liquid or finely divided solid carrier, or both, and then, if necessary, shaping the resulting mixture. For example, a tablet may be prepared by compressing or molding a powder or granules containing the active compound, optionally with one or more accessory ingredients. Compressed tablets may be prepared by compressing, in a suitable machine, the compound in a free-flowing form, such as a powder or granules optionally mixed with a binder, lubricant, inert diluent, and/or surface active/dispersing agent(s). Molded tablets may be made by molding, in a suitable machine, the powdered compound moistened with an inert liquid binder.
Formulations suitable for transdermal administration may also be presented as medicated bandages or discrete patches adapted to remain in intimate contact with the epidermis of the recipient for a prolonged period of time. Formulations suitable for transdermal administration may also be delivered by iontophoresis (passage of a small electric current to “inject” electrically charged ions into the skin) through the skin. For this, the dosage form typically takes the form of an optionally buffered aqueous solution of the active compound.
Formulations of the present disclosure suitable for parenteral administration may conveniently comprise sterile aqueous preparations of the active compound, which preparations are preferably isotonic with the blood of the intended recipient. These preparations may be administered by means of subcutaneous, intravenous, intramuscular, inhalational or intradermal injection. Such preparations may conveniently be prepared by mixing the compound with water or a glycerin buffer and rendering the resulting solution sterile and isotonic with the blood. Alternately, the extracts, fractions thereof or compounds thereof can be added to a parenteral lipid solution.
Formulations suitable for rectal administration are preferably presented as unit dose suppositories. These may be prepared by mixing the active compound with one or more conventional solid carriers, for example, cocoa butter, and then shaping the resulting mixture.
The methods disclosed herein may be used in the treatment of any health condition, disease, or pathology in which copper and/or copper metabolism plays a role in disease pathology or progression. In an embodiment, the disease treated and/or prevented includes any disease in which copper and/or P1B-type heavy-metal ATPases contribute to the disease pathology.
In an embodiment, the method is used in the prevention and/or treatment of cancer and/or fibrotic diseases. In some embodiments, the cancer comprises blood cancer, carcinoma, sarcoma, mesothelioma, colorectal cancer, pancreatic cancer, head and neck cancer, skin cancer, gastric cancer, breast cancer, prostate cancer, thyroid cancer, endometrial cancer, ovarian cancer, lung cancer, hepatocellular carcinoma, and/or kidney renal papillary cell carcinoma. In a further embodiment, the cancer is head and neck cancer comprising esophageal cancer. In a further embodiment, the cancer is pancreatic cancer comprising pancreatic ductal adenocarcinoma.
In an embodiment, the compound or pharmaceutical composition is administered as an antibiotic. The compound may be administered with a therapeutically effective amount of silver and/or copper, or in conjunction with a therapy that alters cellular concentrations of copper (eg., a copper chelator or ionophore). In some embodiments, a therapeutically effective amount of silver and/or copper is from about 1 nM to about 1 mM, from about 1 nM to about 750 μM, from about 1 nM to about 500 μM, from about 1 nM to about 400 μM, from about 1 nM to about 300 μM, from about 1 nM to about 200 μM, from about 1 nM to about 100 μM, or any range therein. A person having skill in the art will recognize the dosing will vary based on the desired use, the pathogen being treated, and the form of administration. For example, higher doses may be desirable and tolerated if the administration is topical. In some embodiments, the compound augments bactericidal or fungicidal properties of the silver and/or copper.
In some embodiments, the disease or condition treated and/or prevented comprises tissue scarring and/or tissue fibrosis; diseases of copper disturbance including Menkes disease, Wilson disease, Alzheimer's disease, Amyotrophic lateral sclerosis, Parkinson's disease, Huntington's disease, Creutzfeldt Jakob disease, MEDNIK syndrome; infection and/or microbial resistance to silver or copper; hyperpigmentation or pigmentation disorders such as postinflammatory hyperpigmentation, melasma, solar lentigines (sun spots), ephelides (freckles), café au lait macules, vitiligo, pityriasis alba, tinea versicolor, and postinflammatory hypopigmentation.
Methods for Augmenting Chemotherapy Drug Efficacy and/or Treating Chemotherapy Drug Resistance in a Subject
In an aspect, methods for augmenting chemotherapy drug efficacy or preventing and/or treating chemotherapy drug resistance in a subject in need thereof are provided. In an embodiment, the method comprises administering to the subject a compound or pharmaceutical composition described herein.
In some embodiments, the chemotherapy drug treatments and/or chemotherapy drug resistance comprises cisplatin resistance, vincristine resistance, paclitaxel resistance, SN-38 resistance, etoposide resistance, doxorubicin resistance, mitoxantrone resistance, and/or 7-ethyl-10-[4-(1-piperidino)-1-piperidino] carbonyloxycamptothecin (CPT-11) resistance. In an embodiment, the chemotherapy resistance is cisplatin resistance or doxorubicin resistance.
Copper transporting P1B-type ATPases are found in every type of living organism including archaebacteria, bacteria, protists, fungi, plants and animals. Notably, the MKV3-binding pocket is highly conserved among all P1B-type ATPases and thus the compounds disclosed herein may be applied to a wide array of organisms to modulate any biological process that is dependent on copper transport via a P1B-type ATPase. For example, fruit ripening in plants is controlled by the ethylene receptor which receives copper from a P1B-type ATPase in a manner akin to tyrosinase metallation in animal cells. Thus, the compounds and methods disclosed herein can be used to modulate non-pathological biological processes as well as disease-related or pathological processes.
In some embodiments, a method for modulating copper transport in a subject comprises administering to the subject a compound described herein. In some embodiments, the compound competitively inhibits a P1B-type heavy metal ATPase, including P1B-type copper ATPase. In some embodiments, the compound specifically binds to an intramembraneous pocket of the P1B-type copper ATPase.
In some embodiments, the P1B-type copper ATPase is ATP7A and/or ATP7B. In an embodiment, the compound competitively inhibits the P1B-type copper ATPase by blocking entry of copper into the P1B-type copper ATPase.
Embodiments of the present disclosure are further defined in the following non-limiting Examples. It should be understood that these Examples, while indicating certain embodiments of the disclosure, are given by way of illustration only. From the above discussion and these Examples, one of ordinary skill in the art can ascertain the essential characteristics of this disclosure and, without departing from the spirit and scope thereof, can make various changes and modifications of the embodiments of the disclosure to adapt it to various usages and conditions. Thus, various modifications of the embodiments of the disclosure, in addition to those shown and described herein, will be apparent to those of ordinary skill in the art from the foregoing description. Such modifications are also intended to fall within the scope of the appended claims.
Copper (Cu) is required for growth and development in all multicellular organisms. In the absence of sufficient levels of copper, pathology can result. In humans, this is illustrated by Menkes disease, a pediatric disorder of copper deficiency caused by mutations in the copper transporter, ATP7A, which is responsible for transporting copper across the basolateral membrane of intestinal enterocytes into the blood (
Previous murine models have shown that intestine-specific knockout of the ATP7A gene (ATP7Aint mice) results in lethality shortly after birth. However, ATP7Aint mice can be rescued by a single injection of CuCl2 if given within a week of birth. The rescued ATP7Aint mice at maturity exhibit normal size, behavior and life-expectancy compared to wild type mice. However, their whole-body copper status remains low throughout their life as evidenced by a lighter coat color (
In addition to controlling copper export from intestinal epithelial cells into the circulation, ATP7A also regulates the export of copper in most cells throughout the body. If copper concentrations become elevated, ATP7A traffics from the trans-Golgi network to the plasma membrane to facilitate copper export and restore copper homeostasis.
Previous studies have demonstrated the importance of ATP7A in primary tumor growth in mice. In syngeneic mouse models, ATP7A deletion reduces primary tumor growth of 4T1 mammary carcinoma cells and LLC lung carcinoma cells. Other studies have shown that ATP7A is a major contributor to the growth and survival of cancer cells carrying mutations in the KRAS gene, a major oncogenic driver in about 32% of lung cancers, about 40% of colorectal cancers, and about 85% of pancreatic cancers. Other studies have shown that ATP7A or ATP7B function in resistance to frontline cancer chemotherapy agents including cisplatin, vincristine, paclitaxel, SN-38, etoposide, doxorubicin, mitoxantrone, and 7-ethyl-10-[4-(1-piperidino)-1-piperidino] carbonyloxycamptothecin (CPT-11). ATP7A is also important in promoting the growth of blood vessels (angiogenesis) by limiting the degradation of the VEGFR2 receptor. An inhibitor of ATP7A/B would be expected to prevent or reverse the development of chemotherapy drug resistance in cancer cells and may provide therapeutic benefit in cancer patients.
Based on these results, ATP7A was selected for further study as a therapeutic target for cancer models.
The family of Cu-dependent lysyl oxidases (LOX) plays a significant role in cancer metastasis. Several oncogenic mechanisms have been attributed to LOX proteins including the activation of tumor cell migration via focal adhesion kinase and the creation of the pre-metastatic niche in distant organs that promotes seeding of tumor cells. Although there have been ongoing efforts to develop inhibitors of LOX family members, a major challenge has been finding an inhibitor of all LOX proteins.
It was hypothesized that inhibiting copper incorporation into all LOX enzymes may be an effective strategy to attenuate LOX-dependent metastasis. Since each LOX family member shares a functional requirement for copper and is secreted from cells, it was believed that ATP7A activity may be required to metalate these enzymes within the secretory pathway.
To test this hypothesis, CRISPR-Cas9 was used to generate an out-of-frame deletion in the ATP7A gene in 4T1 cells, a metastatic cell model of breast carcinoma. The 4T1 model is a highly metastatic triple-negative breast cancer cell line (i.e., ER-, PR-, HER2-) lacking the estrogen receptor, prolactin receptor and the epidermal growth factor receptor HER2. The 4T1 cells readily form primary tumors when injected orthotopically into the mammary glands of Balb/C mice, and closely model aggressive forms of human breast cancer by metastasizing to lymph nodes, lung, bone and liver. In two independent clones lacking ATP7A (C37A and C87A−), it was observed that a significant reduction of LOX activity was secreted into the medium compared to wild type 4T1 cells (
To investigate the effects of ATP7A deletion on specific LOX proteins, wild type 4T1 and C37A− cells were transfected with plasmids encoding one of three different LOX family members (LOX, LOXL1 and LOXL2) together with a GFP plasmid to control for transfection efficiency. After 24 hours the media were collected, and LOX activity was measured as a function of cellular GFP expression. For wild type cells, each LOX plasmid produced elevated LOX activity in the medium relative to cells transfected with the GFP vector alone (
Furthermore, it was demonstrated that ATP7A deletion inhibits tumor cell migration in vitro. An important mechanism of LOX-mediated metastasis is the activation of focal adhesion kinase, FAK1, a key regulator of tumor cell migration. FAK1 phosphorylation is known to regulate the assembly of proteins, including vinculin, at focal adhesion sites. The loss of ATP7A significantly reduces phosphorylation of FAK1 compared to wild type 4T1 cells, which causes an increase in vinculin-positive focal adhesions. Consistent with these changes, the loss of ATP7A resulted in a significant reduction in cell motility as demonstrated by reduced gap closure in an in vitro scratch assay (
4T1 cells undergo LOX-dependent metastasis from the primary tumor to the lungs. To test the effect of ATP7A deletion on primary tumor growth and metastasis, 4T1 cells were injected into the 4th inguinal mammary fat pads of female BALB/c mice. After 4 weeks, primary tumor growth and metastatic lung nodules were quantified. Both the C37A− and C87A− tumors lacking ATP7A were significantly smaller than wild type tumors (
P-type ATPases are a large superfamily of transporters found in all kingdoms of life that pump cations or phospholipids across membranes using the energy derived from ATP hydrolysis. ATP7A and ATP7B are the only mammalian examples of P1B-type ATPases, an evolutionarily distinct subgroup of P-type ATPases that transport Cu1+ ions (or other heavy metals in certain bacteria). Inhibitors of non-P1B ATPases have been described. For example, omeprazole is an inhibitor of the gastric H+/K+ ATPase, ouabain is an inhibitor of Na2+/K+ ATPase, and thapsigargin is an inhibitor of the SERCA Ca2+-ATPase. However, previously there were no known inhibitors of any P1B-type ATPase or any other type of heavy metal transporter.
Potential ATP7A inhibitors were screened using an in silico approach. A model of ATP7A was generated based on its homology to a bacterial Cu-transporting P1B-type ATPase from Legionella pneumophila (LCopA) whose structure has been solved in a Cu-free E2 conformation (PDB structure 3RFU). The LCopA structure revealed a “platform” at the cytosolic membrane interface that is proposed to serve as a copper loading site for entry into the channel. As copper enters the mouth of the transporter, it is thought to be coordinated by a triad of Met-Glu-Asp residues that are found in all P1B-type ATPases (M746, E798 and D935 in ATP7A) (
Using a computer-based approach, molecules predicted to bind within this pocket were screened. Out of over 8 million compounds screened, 500 of the best-fitting candidates were selected based on ‘Glide’ score, adherence to Lipinski's rule of five and visual inspection, and further analyzed using the ‘Induced Fit Docking (IFD)’ utility of the Schrödinger software suite. Ten compounds exhibiting the most favorable binding energy and Glide scores were synthesized and tested for their ability to bind and inhibit ATP7A. Two chemically related compounds, MKV1 and MKV3 (analogs of substituted N-phenyl-3-(phenylamino)-3-thioxopropanamide), were selected for further study. MKV3 is shown docked in the pocket of ATP7A in
MKV1 and MKV3 share a common molecular scaffold (
The computer-aided drug design suggested that three functional groups within MKV3 may contribute to its affinity, namely a chloro group (—Cl), a nitrile group (N) and a trifluoromethyl group (—CF3). Analyses of the MKV3-binding pocket in ATP7A reveals a deep crevice formed by residues from 4 helices (E1033, T1008, Q932 and E798) (
To evaluate the importance of these groups in MKV3, a second compound called MKV1 was generated. MKV1 was designed to lack the chloro, nitrile, and trifluoromethyl groups but retain the same core structure as MKV3 (
Analysis of the MKV binding pocket in ATP7A and ATP7B revealed a high degree of sequence conservation with only a single amino acid difference involving E1030 of ATP7A which corresponds to K1013 in ATP7B (
The chemical differences between MKV3 and MKV1 can be used to generate improved analogs using structure activity relationship (SAR) analyses.
The ability of MKV3 to block ATP7A and ATP7B function in vitro was tested using the CuS cell line in which genes for ATP7A, MT-I and MT-II were deleted to create a highly copper sensitive cell line (
Other studies of ATP7A inhibition by MKV1 and MKV3 were performed using B16 melanoma cells. As a positive control for ATP7A inhibition, CRISPR-Cas9 technology was used to disrupt the ATP7A gene in B16 melanoma cells, which resulted in a loss of tyrosinase activity (ATP7AKO) cells (
Both MKV1 and MKV3 significantly reduced tyrosinase activity in B16-WT cells (
Using complementation studies in B16 ATP7AKO cells it was shown that the activation of tyrosinase activity by expression of ATP7B is blocked by MKV3 (
Using an independent assay of ATP7A activity, it was further found that MKV3 significantly reduced LOX activity in Lewis Lung Cancer (LLC) cells (
In other studies, MKV3 was shown to block the motility of 4T1 breast cancer cells (
In other studies, MKV3 was found to block the copper-stimulated trafficking of ATP7A from the perinuclear region to cytoplasmic vesicles in 4T1 breast cancer cells (
Pilot studies were performed to test whether MKV3 blocks ATP7A-mediated tumor growth and metastasis in mice using the orthotopic 4T1 model of breast cancer. Using two different modes of administration (subcutaneous and intravenous), MKV3 significantly reduced tumor weight and metastatic burden compared to vehicle control (
Previous studies have shown that ATP7A and ATP7B are multidrug resistance proteins that confer tolerance to multiple types of anti-cancer chemotherapy drugs including cisplatin and doxorubicin (DOX). Taking advantage of the auto-fluorescent properties of DOX, it was found that MKV3 significantly reduced the accumulation DOX in 4T1 breast cancer cells (
MKV3 Inhibition of Methicillin-Resistant Staphylococcus aureus
MKV3 was also found to inhibit the growth of wild type methicillin-resistant Staphylococcus aureus (MRSA) in a Cu-dependent manner, indicating potential use of MKV3 analogs as novel antibiotics.
Wild type MRSA expresses two copper-exporting P1B-type ATPases, CopA and CopB that are required for copper tolerance (
Initial structural analysis focused on the importance of the sulfur in MKV3. The predicted MKV3 binding pocket is located in close proximity to the copper-binding triad in P1B-type ATPases. It was thought that MKV3 may provide a coordinating Cu(I) ligand as a mechanism of preventing copper movement into the channel domain. To test this hypothesis, a control compound was generated in which the sulfur atom in the thioamide was replaced with oxygen to generate a corresponding amide (MKV3-D1).
Table 1 lists the names and chemical structures of MKV3 derivative compounds, the 50% inhibitory concentration (IC50) of each compound for tyrosinase activity in B16 cells, and the affinity of each compound for ATP7A using MST analysis. The results demonstrate that the chlorine, nitrile and trifluoromethyl groups of MKV3 are important for inhibitory activity and binding to ATP7A.
It is to be understood that while the invention has been described in conjunction with the detailed description thereof, the foregoing description is intended to illustrate, and not limit the scope of the invention, which is defined by the scope of the appended claims. Other embodiments, advantages, and modifications are within the scope of the following claims. Any reference to accompanying drawings which form a part hereof, are shown, by way of illustration only. It is understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the present disclosure. All publications discussed and/or referenced herein are incorporated herein in their entirety.
The features disclosed in the foregoing description, or the following claims, or the accompanying drawings, expressed in their specific forms or in terms of a means for performing the disclosed function, or a method or process for attaining the disclosed result, as appropriate, may, separately, or in any combination of such features, be utilized for realizing the invention in diverse forms thereof.
This application claims priority under 35 U.S.C. § 119 to provisional patent application U.S. Ser. No. 63/262,611 filed Oct. 15, 2021. The provisional patent application is herein incorporated by reference in its entirety, including without limitation, the specification, claims, and abstract, as well as any figures, tables, appendices, or drawings thereof.
This invention was made with government support under NIH/NIDDK Grant No. DK116859 and NIH/NCI Grant No. CA262664. The government has certain rights in the invention.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/US2022/078099 | 10/14/2022 | WO |
| Number | Date | Country | |
|---|---|---|---|
| 63262611 | Oct 2021 | US |
