Patent Application
20210260018
The instant application contains a Sequence Listing which has been submitted electronically in ASCII format and is hereby incorporated by reference in its entirety. Said ASCII copy, created on May 4, 2021, is named CBX-00301 SL.txt and is 8,067 bytes in size.
The present invention relates to a composition for treating a fibrotic disease, which includes a benzhydryl thioacetamide compound as an active ingredient, and more particularly, to a composition for treating a fibrotic disease, which suppresses the expression of KCa2.3 channel proteins in a cell membrane, and has an excellent effect of treating, particularly, liver fibrosis and pulmonary fibrosis.
Fibrosis is a phenomenon of excessively accumulating an extracellular matrix such as collagen in tissue, and occurs during the process of tissue damage and recovery. The fibrosis may occur in all organs in the body, and it easily occurs, particularly, when an injury is severe and extensive and when the process of tissue injury and recovery is repeated as in chronic diseases. When fibrosis occurs, damaged tissue is replaced with fibrous tissue, reducing the functions of an organ. Therefore, when fibrosis occurs extensively, the organ function is greatly reduced, thereby causing various types of diseases. Particularly, when fibrosis occurs in the internal organs that directly affect life, such as the liver, lung, kidney and heart, it may have a fatal effect on health.
Generally, a process of fibrosis may include 1) the exposure to a fibrosis-inducing diseases (normally, chronic diseases) or materials, and 2) the resulting fibrotic process (inflammation, fibrosis, and angiogenesis). When inflammation and injury occur due to a fibrosis-inducing disease or material, fibrosis and angiogenesis are accelerated by growth factors and cytokines, which are secreted in cells participating in this process. Therefore, fibrotic diseases may be treated by removing fibrosis causes (diseases or materials) or suppressing the fibrotic process.
However, it is virtually impossible to completely remove the causes of fibrosis. The causes are unknown in many fibrotic diseases such as idiopathic pulmonary fibrosis. Even if the causes of fibrotic diseases, such as chronic viral hepatitis, steatohepatitis, diabetes causing heart or kidney fibrosis, and aging frequently causing various types of fibrotic diseases, are known, it is often impossible to cure the cause diseases completely. Therefore, treatment of fibrotic diseases requires concurrent treatment for inhibiting the fibrotic process (inflammation, fibrosis, angiogenesis) as well as treatment of a causative disease. However, no therapeutic agent for inhibiting the fibrotic process has been developed.
In the fibrotic process, the formation of myofibroblasts and the activation of hepatic stellate cells (in the liver, the activated hepatic stellate cells serve as myofibroblasts) are very important. The formation of myofibroblasts including the activation of hepatic stellate cells is induced by activation of fibroblasts or smooth muscle cells or endothelial-mesenchymal transition of endothelial cells. In addition, when myofibroblasts are formed, the number of the myofibroblasts greatly increases due to active cell proliferation, the production of an extracellular matrix such as collagen increases, and angiogenesis is stimulated due to active vascular endothelial cell proliferation. Such a fibrotic process, that is, myofibroblast formation (including the activation of hepatic stellate cells), myofibroblast proliferation, extracellular matrix production, the activation of vascular endothelial cells and angiogenesis occur via intracellular C2+-dependent signaling pathways. Therefore, C2+ plays a very important role in the fibrotic process.
For the increase in C2+ in fibroblasts, hepatic stellate cells and vascular endothelial cells, C2+-activated K+ channels, that is, “KCa channels” are significantly important. The K+ channel activation-induced hyperpolarization promote Ca2+ influx through Ca2+ entry channels in these cells. The KCa channels playing such a role in these cells are the KCa2.3 channel and the KCa3.1 channel. These two K+ channels are similar in structure and function, but there is a difference in cells in which these channels are distributed.
Since mRNA is found in most tissue cells, the KCa2.3 channel is possibly distributed in most tissues in the body (Na Schmiedebergs Arch Pharmacol 0.2004; 369(6):602-15), and widely distributed in the liver, nerves and vascular endothelial cells. On the other hand, the KCa3.1 channel is generally distributed in vascular endothelial cells, fibroblasts, immune cells and red blood cells (Curr Med Chem. 2007; 14(13):1437-57; Expert Opin Ther Targets. 2013; 17(10):1203-1220).
As described above, KCa2.3 or KCa3.1 channels, which are considered to significantly contribute to the progression of fibrosis via promoting Ca2+ influx through Ca2+ entry channels, are being studied as the main targets of therapeutic agents for fibrotic diseases. Particularly, it has been reported that a selective inhibitor of the KCa2.3 channel, apamin, has an inhibitory effect on endothelial-mesenchymal transition that is critical for the fibrotic process, and has a therapeutic effect on liver fibrosis and biliary fibrosis (Biochem Biophys Res Commun, 2014; 450(1): 195-201; Int J. Mol Med. 2017; 39(5):1188-1194).
The ion channel inhibitors, that have been developed so far, inhibits cell functions via inhibiting the activity of an ion channel (inhibiting the flow of ions through a channel protein). Since the number of channel proteins expressed in a cell membrane affect cell function, cell functions can also be regulated by reducing the number of channel proteins expressed in a cell membrane (inhibition of the expression of a channel protein in a cell membrane). No drug for regulating an expression level of a channel protein in a cell membrane has been developed so far, and molecules to regulate the expression level can be a new therapeutic for various diseases (Chem Med Chem. 2012; 7(10):1741-1755). Particularly, since the expression of the KCa2.3 channel is increased by growth factors in fibrotic diseases, drugs for inhibiting the expression of KCa2.3 channel proteins may be developed as therapeutic agents for fibrotic diseases.
Meanwhile, in U.S. Pat. Nos. 4,066,686 and 4,177,290, a benzhydryl sulfinyl acetamide derivative included in the present invention is suggested as drugs for treating central nervous system disorders, and this compound was developed as a medication to treat narcolepsy by Lafon, France, and is sold under the generic name “modafinil.” Adrafinil, which is known as the modafinil precursor, that is, diphenylmethyl-thioacetohydroxamic acid, was also developed as a medication having the same efficacy as modafinil (CNS Drug Reviews Vol 5, No. 3 193-212, 1999).
In addition, according to U.S. Pat. No. 4,927,855, it has been suggested that the R-isomer of modafinil (Lafon), that is, (−)-benzhydryl sulfinyl acetamide, has therapeutic effects on anti-depressant, hypersomnia and Alzheimer's disease, according to U.S. Pat. No. 6,180,678, it has been suggested that R-modafinil (Vetoquinol, France) is effective in treatment of behavioral problems of an older dog, improvement in learning effect, bladder control, and memory improvement, and according to U.S. Pat. No. 9,637,447, it has been suggested that 2-[bis(4-fluorophenyl)methanesulfinyl]acetamide, known under the generic name “lauflumide,” is effective against attention-deficit hyperactivity disorder (ADHD), narcolepsy, epilepsy, and lethargy.
In addition, the inventors have reported in Korean Patent Nos. 10-1345860 and 10-1414831 and the corresponding U.S. Pat. No. 9,259,412 that modafinil and their derivatives can be used as drugs to treat vascular diseases and KCa3.1 channel-mediated diseases, that is, cancer and autoimmune diseases by increasing cAMP to relax blood vessels, and inhibit KCa3.1 current.
In the process of studying the pharmaceutical activity of benzhydryl thioacetamide compounds including benzhydryl sulfinyl acetamide derivatives, the inventors found that such compounds surprisingly suppress the expression of the KCa2.3 channel in a cell membrane, and further have a therapeutic effect on fibrotic diseases in mouse models.
The present invention is directed to providing a novel composition for treating fibrotic diseases, which includes a benzhydryl thioacetamide compound or a pharmaceutically acceptable salt thereof as an active ingredient. For reference, the “benzhydryl thioacetamide compound” used herein is used as a concept including “benzhydryl sulfinyl acetamide compound.”
A composition for treating a fibrotic disease according to the present invention includes a benzhydryl thioacetamide compound represented by Formula. A below or a pharmaceutically acceptable salt thereof as an active ingredient.
[in Formula A, X1˜X10 may each be independently hydrogen (H) or fluorine (F), all of which may be the same as or different from each other; Y is sulfur (S) or sulfoxide (S═O), * indicates a chiral position; R1 is any one of hydrogen, a methyl group, an ethyl group, a methoxy group, an ethoxy group, a hydroxyl group, and a carbon compound having 3 to 6 carbon atoms.]
In the compound of Formula A, X1˜X10 are each independently hydrogen (H) or fluorine (F), Y is sulfur (S), and R1 is hydrogen (H).
In the compound of Formula A, X1˜X10 are each independently hydrogen (H) or fluorine (F), Y is sulfoxide (S═O), and R1 is hydrogen (H).
The compound of Formula A has an effect of suppressing the expression of the KCa2.3 channel protein in a cell membrane.
The compound of Formula A has efficacy in treating, particularly, liver fibrosis and pulmonary fibrosis.
It was confirmed that the benzhydryl thioacetamide compound according to the present invention has an effect of suppressing the expression of a KCa2.3 channel protein in an in vitro experiment for culture cells, and further has an effect of inhibiting inflammation and fibrosis and improving liver functions in an in vivo experiment for mouse models in which liver and lung diseases are induced.
Accordingly, the benzhydryl thioacetamide compound according to the present invention can be effectively used as a pharmaceutical composition for treating various types of inflammatory and fibrotic diseases that occur in the human body, and particularly, inflammatory and fibrotic diseases in the liver and lungs, and is expected to be developed as a medication for animals, if needed.
A benzhydryl thioacetamide compound according to the present invention, represented by Formula A, includes, specifically, compounds of Formulas A1 to A9 below.
The compound of Formula A1 is known under the generic name “modafinil,” and currently used as a medication to treat hypnolepsy, and clinical trials for use in treatment of other psychiatric diseases are ongoing. The chemical name of modafinil is 2-(benzhydrylsulfinyl)acetamide, and may be synthesized by a known method or commercially available.
All of the compounds of Formulas A2 to A9 have the effect of suppressing the expression of a KCa2.3 channel protein in a cell membrane according to the same mechanism as the modafinil, and further have a therapeutic effect on fibrotic diseases in the human body. Among these, the compound of Formula A9 is known under the generic name “lauflumide.”
The chemical names of the compounds of Formulas A1 to A9 are as follows. The code names listed in parentheses at the end of each chemical name are code names used in the following examples by the inventors.
1) Formula A1; 2-(benzhydrylsulfinyl)acetamide (CBM-N1)
2) Formula A2; 2-(benzhydrylthio)-N-[(tetrahydrofuran-2-yl)methyl]acetamide (CBM-N2)
3) Formula A3; 2-(benzhydrylthio)-N-phenylacetamide (CBM-N3)
4) Formula A4; 2-(benzhydrylsulfinyl)-N-methylacetamide (CBM-N4)
5) Formula A5; 2-(benzhydrylsulfinyl)-N-[(tetrahydrofuran-2-yl)methyl]acetamide (CBM-N5)
6) Formula A6; 2-(benzhydrylthio)-ene-methylacetamide (CBM-N6)
7) Formula A7; 2-[bis(2-fluorophenyl)methanesulfinyl]acetamide (CBM-N7)
8) Formula A8; 2-[bis(3-fluorophenyl)methanesulfinyl]acetamide (CBM-N8)
9) Formula A9; 2-[bis(4-fluorophenyl)methanesulfinyl]acetamide (CBM-N9)
The compounds of Formulas A2 to A6 may be synthesized by the methods disclosed in Korean Patent No. 10-1345860, or commercially available, but no effective methods of preparing the compounds of Formulas A7 to A9 are known. Thus, in the present invention, methods of preparing the compounds of Formulas A7 to A9 were described as examples.
The pharmaceutical composition according to the present invention includes a pharmaceutically acceptable salt of the compound of Formula A. Here, the “pharmaceutically acceptable salt” may commonly include a metal salt, a salt with organic base, a salt with an inorganic acid, a salt with an organic acid, or a salt with a basic or acidic amino acid. In addition, the pharmaceutical composition according to the present invention may include both of a solvate and a hydrate of the compound of Formula A, also include all of available stereoisomers, and further include a crystalline or amorphous form of each compound.
The pharmaceutical composition according to the present invention may be formulated in the form of a tablet, a pill, a powder, a granule, a capsule, a suspension, a liquid for internal use, an emulsion, a syrup, an aerosol, or a sterile injection solution according to a conventional method. In addition, the pharmaceutical composition of the present invention may be administered either orally or parenterally according to the purpose of use, and parenteral administration may be performed by dermal injection for external use, intraperitoneal injection, intrarectal injection, subcutaneous injection, intravenous injection, intramuscular injection or intracardiac injection.
A dose of the pharmaceutical composition according to the present invention may vary according to a patient's body weight, age, sex, health condition, diet, an administration duration, an administration method, an excretion rate, and the severity of a disease. A daily dose is preferably 0.2 to 20 mg/kg, and more preferably 0.5 to 10 mg/kg based on an active ingredient, and may be administered once or twice daily, but the present invention is not limited thereto.
1) Synthesis of Compounds
1-1) Synthesis of Compound of Formula A9
A method of synthesizing a compound (lauflumide) of Formula A9 will be described with reference to the following reaction scheme. 24 g of 4,4′-bisdfluoro benzhydrol (I) was put into a 500 mL round-bottom flask, dissolved in 150 mL of added trifluoroacetic acid, and stirred with 12.05 g of added thigolic acid for approximately 2 hours, followed by confirmation of the termination of the reaction by thin-layer chromatography. The reaction product was subjected to vacuum distillation to remove the trifluoroacetic acid, neutralized and extracted with an ethyl acetate organic solvent. The resulting extract was dried with magnesium sulfate, thereby obtaining 34.8 g of compound (II), which is a sticky yellow oil, with a quantitative yield.
34.8 g of the compound (II) was dissolved in 250 mL of anhydrous ethanol, and 4.2 g of concentrated sulfuric acid was added, followed by reflux for 8 hours. Subsequently, the resulting product was cooled to room temperature, concentrated to remove ethanol, dissolved in a methylene chloride solvent, and washed with water twice. The resulting product was washed again with a 5% NaHCO3 solution, and dried with anhydrous magnesium sulfate, thereby obtaining 39.1 g of compound (III), which is a yellow oil, with a quantitative yield.
34.3 g of the compound (III) was put into a round-bottom flask (500 mL), 210 mL of methanol was added, 21.4 mL of an acid catalyst (the acid catalyst was prepared by dissolving 4 g of sulfuric acid in 90 mL of isopropyl alcohol), and a 35%11202 solution was slowly added, followed by stirring overnight at room temperature. Subsequently, 70 g of sodium chloride (NaCl) was added, extracted with a methylene chloride solution three times, dried with anhydrous magnesium sulfate and concentrated, thereby obtaining compound (IV) with a quantitative yield. 5.1 g of the compound (IV) was added to a round-bottom flask (100 mL) with 13 mL of methanol, 1.3 g of ammonium chloride (NH4Cl) was added, and 98 mL of a concentrated ammonium hydroxide solution (NH4OH) was then added. After stirring overnight, a white emulsion-type solution was filtered, thereby obtaining 4 g of a solid powder. The 4 g of the solid powder was dissolved in 28 g of isopropyl alcohol, refluxed and cooled to a room temperature, thereby obtaining 2.1 g of 2-[bis(4-fluorophenyl)methanesulfinyl]acetamide, which is a white crystal compound, represented by Formula. A9.
1H NMR (DMSO-d6): δ 7.68 (bs, 1H); 7.56-7.51 (m, 4H), 7.33 (bs, 1H), 7.29-7.24 (m, 4H), 5.4 (s, 1H); 3.4 (d, J=13.6 Hz, 1H); 3.16 (d, J=13.6 Hz, 1H)
1-2) Synthesis of Compound of Formula A8
3,3′-bisfluoro benzhydrol was synthesized by a conventional method (Tetrahedron Lett, vol 58, 442, 2017, EP 1,433,744, J. Med. Chem. vol 40, 851, 1997). This compound was used as a starting material, and a compound of Formula A8, that is, 2-[bis(3-fluorophenyl)methanesulfinyl]acetamide, was synthesized by the method of synthesizing the compound of Formula A9.
1H NMR (DMSO-d6): δ 7.68 (bs, 1H); 7.5-7.2 (m, 9H), 5.4 (s, 1H); 3.4 (d, 1H); 3.16 (d, Hz, 1H)
1-3) Synthesis of Compound of Formula A7
2,2′-bisfluoro benzhydrol was synthesized by a conventional method (EP 1,661,930, 11 Med. Chem, vol 51, #4, 976, 2008). This compound was used as a starting material, and the compound of Formula A7, that is, 2-[bis(2-fluorophenyl)methanesulfinyl]acetamide, was synthesized using the method of synthesizing the compound of Formula A9.
1H NMR (DMSO-d6): δ 7.68 (bs, 1H); 7.5-7.2 (m, 9H), 7.33 (bs, 1H), 5.4 (s, 1H); 3.4 (d, 1H); 3.16 (d, 1H)
2) Experimental Method
2-1) Cell Culture
Fibroblasts (CRL-2795; American Type Culture Collection, VA) were cultured in a Dulbecco's Modified Eagle Medium (Hyclone, Logan, Utah), human uterine microvascular endothelial cells (PromoCell GmbH, Heidelberg, Germany) were cultured in an MV2 medium (PromoCell GmbH), and human hepatic stellate cells (Innoprot, Bizkia, Spain) were cultured in a P60126 medium (Innoprot).
All cells were maintained under a 5% humidified carbon dioxide condition at 37° C. The cultured cells were exposed to each of PDGF, TGFβ, and the compounds of Formulas A1 to A9 (CBM-N1 N9) for 24 hours, followed by performing experiments.
2-2) Construction of Liver Disease Mouse Models
To confirm the effects of the compounds of Formula A1 to A5 (CBM-N1˜N5) according to the present invention on liver inflammation and fibrosis, subsequent experiments were performed on C57BL/16 wild-type mouse (purchased from Orient Bio). First, to induce liver disease in mice, thioacetamide (TAA) were administered to the mice (Experiment A), or the mice were raised on a western diet inducing fatty liver disease (Experiment B). The mice were divided into a normal control, a disease-induced group, and a drug-administered group, and among these three groups, 15 to 100 mice were used in each group for Experiment A, and 10 mice were used in each group for Experiment B. A drug treatment method for the mice in each group is as follows:
(1) Normal control: The normal control in Experiment A was intraperitoneally injected three times a week with the same amount of TAA solvent used when TAA was injected into a disease-induced group, and the normal control in Experiment B was raised on a normal diet. In both of the Experiments A and B, a CM/1-N1 solvent was injected using an oral tube at the same amount as that of CBM-N1 injection five times a week. The TAA solvent was distilled water, the CBM-N1 solvent and a derivative thereof were a 1:1 mixture of DMSO and distilled water. In the accompanying drawings, C or Control refers to a normal control.
(2) Disease-induced group: The disease-induced group in the Experiment A was intraperitoneally injected with TAA at 100 mg/kg three times a week, the disease-induced group in the Experiment B was raised on a western diet (WD, 45% saturated fat, 02% cholesterol, and water containing fructose and glucose). All CBM-N1 solvents in the Experiments A and B were administered using an oral tube at the same amount as that of CBM-N1 administration five times a week. In the accompanying drawings, TAA refers to a group in which a disease is induced by TAA, and \VD refers to a group in which a disease is induced by a western diet.
(3) Drug-administered group: In the Experiment A, the compounds of Formulas 1 to 5 (50 mg/kg/day, 5 times/week e administered with TAA (100 mg/kg, 3 times/week), and in the Experiment B, CBM-N1 to N5 (50 mg/kg/day, 5 times/week) were administered with a western diet. The mice treated by the above-described method for 16 weeks were instantly killed by excessively administering an anesthetic, and then the livers and blood were extracted. In the accompanying drawings, TAA+CBM-Ni, TAA+CBM-N2, TAA+CBM-N3, TAA+CBM-N4 and TAA+CBM-N5 refer to disease-induced groups to which the compounds of Formulas A1 to A5 were administered, respectively.
2-3) Construction of Pulmonary Inflammation and Fibrosis Mouse Models
To confirm the effect of the compound of Formula A9 (CBM-N9) on pulmonary inflammation and fibrosis caused by bleomycin, the following experiments were performed on C57BL/6 wild-type mice. First, the mice were divided into a normal control, a disease-induced group, and a drug-administered group, and ten mice were included in each of the three groups. A drug treatment method for the mice in each group is as follows:
(1) Normal control: The same amount of distilled water as used when the bleomycin was applied in the disease-induced group was instilled intratracheally. In addition, a CBM-N9 solvent was intraperitoneally injected at the same amount used when CBM-N9 was administered to the disease-induced group to be described below five times a week.
(2) Disease-induced group: 1.5 units of bleomycin was instilled intratracheally. In addition, a CBM-N9 solvent was intraperitoneally injected at the same amount used in CBM-N9 administration five times a week.
(3) Drug-administered group: 1.5 units of bleomycin was intratracheally instilled. In addition, CBM-N9 (50 mg/kg) was injected intraperitoneally five times a week.
The mice treated with the drug for 4 weeks in the same manner as described above were instantly killed by excessively administering an anesthetic, and then the lungs were extracted.
2-4) Preparation of Paraffin Tissue Samples of Liver and Lung Tissues and Observation of Morphological Changes Thereof
To histologically confirm the therapeutic effect of the compound of Formula A1 (CBM-N1) or the compound of Formula A9 (CBM-N9) in each mouse model, a paraffin tissue sample was prepared. Liver and lung tissues were fixed with a paraformaldehyde solution, and sliced to a thickness of 1 to 2 mm. The sectioned tissues were embedded in paraffin, sliced to a thickness of 4 μm to remove paraffin with xylene, and the xylene was removed with ethanol, followed by washing with tap water. The resulting tissues were subjected to hematoxylin and eosin staining (H&E staining) or immunohistochemistry.
(1) H&E staining: Nuclei were first stained (blue) with a Harris hematoxylin staining solution for 5 minutes, and counter-stained (pink) with an eosin solution.
(2) Immunohistochemistry for inflammation markers: Inflammation markers (CD82 and CD45) were stained with specific antibodies, and lymphoid cells were stained brown.
(3) Immunohistochemistry for fibrosis markers: Collagen was stained by Masson's trichrome staining, or reticulin fibers were stained by reticulin staining.
2-5) Liver Function Test
Aspartic acid aminotransferase (AST, GOT) and alanine aminotransferase (ALT, GPT), total bilirubin and albumin concentrations were measured using blood collected from liver disease mouse models. A method for liver function testing is shown in Table I below.
2-6) Real-Time Polymerase Chain Reaction (Real-Time PCR) Analysis
The mRNA expression levels of inflammation or fibrosis factors in extracted liver tissue were measured by real-time PCR. RNA of the liver tissue was isolated with a TRIzol reagent (Molecular Research Center, Cincinnati, Ohio), and single-stranded cDNA was synthesized using BcaBEST polymerase (TakaraShuzo), followed by a polymerase chain reaction.
Primer sequences (SEQ ID NOs: 1 to 30) of inflammatory cytokines and fibrosis markers used herein are shown in Tables 2 to 4 below.
2-7) Western Blotting Analysis
Cells were lysed with a protein extraction buffer solution, a protein concentration in a supernatant was determined by Bradford analysis, and 30 mg of the protein was loaded on an SDS-PAGE gel and then transferred to a nitrocellulose membrane. The nitrocellulose membrane was blocked with 5% BSA-containing TEST (10 mM Tris-HCl, 150 mM NaCl, and 0.1% (v/v) Tween-20, pH 7.6) at room temperature for 1 hour. Blots were incubated overnight with primary antibodies, and then incubated with horseradish peroxidase-conjugated secondary antibodies for 1 hour. Bands were visualized by chemiluminescence. Data collection and processing were performed using an image analyzer (LAS-3000) and IMAGE GAUSE software (Fuji film, Japan).
2-8) Test Method for MTT Cell Proliferation
Cells were seeded in 96-well plates at 2×104 cells/well, and then exposed to TGFB, which promotes cell proliferation, for 24 hours. In addition, 0.1 mg of MTT was added to each well, followed by exposure for 4 hours at 37° C. Afterward, the culture medium was removed, the cells were lysed with dimethyl sulfoxide, and then absorbance was measured at 590 nm using the following devices.
2-9) Electrophysiological Analysis
A whole cell current through a cell membrane in the isolated and cultured single cells was measured using a patch-clamp technique. A voltage ramp was applied from −100 mV to +100 mV using a micro glass electrode in whole-cell voltage clamped cells, and the resulting current was amplified using an amplifier (EPC-10, HEKA, Lambrecht, Germany), followed by recording at a sampling rate of 1 to 4 kHz.
A standard external solution contained 150 mM NaCl, 6 mM KCl, 1.5 mM CaCl2), 1 mM MgCl2, 10 mM HEPES and 10 mM glucose at pH 7.4 (titrated NaOH), and a micro glass electrode (pipette) solution contained 40 mM KCl, 100 mM K-aspartate, 2 mM MgCl2, 0.1 mM EGTA, 4 mM Na2ATP and 10 mM HEPES at pH 7.2 (titrated with KOH). A free Ca2+ concentration in the pipette solution was adjusted to 1 μM by adding an appropriate amount of Ca2+ in the presence of 5 mM EGTA (calculated with CaBuf; Droogmans, Leuven, Belgium),
The KCa2.3 current was separated by the following method. Among the currents recorded by injecting 1 μM Ca2+ into whole-cell voltage clamped cells using a glass electrode and applying 1-ethyl-2-benzimidazolinone (1-EBIO, 100 μM) activating the KCa2.3 current, a current inhibited by apamin (200 nM), which is a KCa2.3 channel inhibitor, was determined as the KCa2.3 current, and the recorded current was divided by cell capacitance and normalized.
2-10) Statistical Analysis
Experimental results were expressed as mean±standard deviation (S.E.M). Statistical analysis was performed using a Student's t-test, and P≤0.05 was determined as significant difference.
3) Results of Experiments Using Cultured Cells
The experiments were performed to identify effects of the compounds of Formulas A1 to A9 (CBM-N1˜N9) according to the present invention on in vitro KCa2.3 channel expression, and whether the compounds of Formulas A1 to A9 (CBM-N1˜N9) inhibit fibrosis.
3-1) Effects of Growth Factors and CBM-N1 on KCa2.1 and KCa3.1 Channels
3-2) Inhibitory Effect of CBM-N1 on Fibrosis
3-3) Effect of CBM-N1 and its Derivatives (CBM-N2 to CBM-N9) on KCa2.3 Channel Expression and Cell Proliferation
4) Results from Liver Disease Mouse Models
To identify the therapeutic effects of the compounds of Formulas A1 to A5 (CBM-N1 to CBM-N5) in liver disease mouse models, these experiments were performed.
4-1) Histological or Immunohistological Analysis
4-2) Liver Function Test Through Blood ALT and AST Analyses
In addition,
From the test results, it can be seen that liver dysfunction induced by TAA or a western diet is significantly recovered by compounds of Formulas A1 to A5 (50 mg/kg/day).
4-3) Real Time PCR for Inflammation Markers
The mRNA level of an inflammation factor also decreased in the CBM-N2 to CBM-N5-administered groups (TAA+CBM-N2, TAA+CBM-N3, TAA+CBM-N4, and TAA+CBM-N5) compared with the disease-induced group (
In addition,
4-4) Real Time PCR for Fibrosis Markers
4-5) Effect on Protein Expression of Inflammation Marker or Fibrosis Marker Proteins
4-6) Effect on Expression of KCa2.3 Channel Protein
To identify the therapeutic effect of the compound of Formula A9 (CBM-N9) of the present invention in bleomycin-induced lung disease mouse models, this experiment was performed.
5-1) Histological or Immunohistological Analysis
5-2) Analysis of Protein Expression of Inflammation or Fibrosis Markers
6) Evaluation and Conclusion
As seen above, when culture cells were administered with the compounds of Formulas A1 to A9 according to the present invention in vitro for a long time (24 hours or 16 weeks), the effect of inhibiting fibrosis was exhibited by the decrease in expression of a KCa2.3 channel protein. Specifically, it was confirmed that, when cultured hepatic stellate cells, fibroblasts, and vascular endothelial cells were exposed to the compounds of Formulas A1 to A9 for 24 hours, the cell membrane expression of a KCa2.3 channel was inhibited, and the expression of fibrosis-related factors SMA, Col1α, etc.) and cell proliferation by growth factors inducing fibrosis were inhibited.
In addition, it was confirmed that the compounds of Formulas A1 to A9 according to the present invention have inhibitory effects on inflammation and fibrosis in a liver disease-induced group even in an in vivo experiment for mouse models. Specifically, as a result of administering the compounds of Formulas A1 to A9 to liver disease or lung disease mouse models for 16 weeks, inflammation and fibrosis were significantly inhibited.
Meanwhile, as disclosed in Korean Patent Nos. 10-1345860 and 10-1414831 and U.S. Pat. No. 9,259,412 corresponding thereto, the compounds of Formulas A1 to A5 of the present invention have effects of inhibiting the activity of a KCa3.1 channel due to KCa3.1 channel phosphorylation induced by cAMP. However, it is considered that the suppression of the activity of the KCa3.1 channel by increased cAMP will have little effect on fibrosis treatment.
The present invention relates to an effect exhibited when being exposed to the compounds of Formulas A1 to A5 for a short lime (within several minutes), and the increased cAMP due to these compounds reached the highest level in approximately 20 minutes and then dramatically decreased such that the cAMP level became similar to that before drug administration within three hours (Endocrinology 144(4):1292-1300). Therefore, this is because the effect caused by cAMP is exhibited only for a short time, for example, at most, approximately one hour, and as in the case of the presentation, is unlikely to last for 24 hours or 16 weeks.
In addition, as confirmed in
Meanwhile, in the present invention, due to realistic limitations, the above-described experiments for all of compounds belonging to the compounds of Formula A were not performed. However, in consideration of chemical activities of the compounds of Formula A and metabolic mechanisms in vivo, it is inferred that all of the compounds of Formula A have pharmacological effects the same as or similar to the compounds of Formulas A1 to A9.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2018-0110442 | Sep 2018 | KR | national |
This application is the U.S. National Phase of International Patent Application No. PCT/KR2019/011834, filed Sep. 11, 2019; which claims the benefit of priority to Korean Patent Application No. KR 10-2018-0110442, filed Sep. 14, 2018.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2019/011834 | 9/11/2019 | WO | 00 |
