Patent Application
20240165123
The present invention belongs to the field of medicine, in particular to the use of a compound containing a tricyclic heteroaryl group in the preparation of a medicament for treating a disease related to high expression or abnormal activation of JAK and SYK kinases.
JAK (namely Janus kinase) is a class of non-transmembrane non-receptor tyrosine kinases, including four subtypes: JAK1, JAK2, JAK3 and TYK2 (tyrosine kinase 2). JAK1, JAK2, and TYK2 are widely present in various tissues and cells. JAK1 participates in mediating the inflammatory signaling pathways such as IL-6 and IFN. JAK2 can independently mediate cytokine signaling pathways such as IL-3, IL-5 and EPO. JAK3 is only present in bone marrow and lymphatic system, and mediates the signaling of IL-2, IL-4, IL-7, IL-9, IL-15 and IL-21. TYK2 participates in IFN-alpha, IL-6, IL-10 and IL-12 signaling. JAK inhibitors block the cascade amplification of the above cytokines, and participate in immune regulation and other processes by specifically inhibiting the JAK-STAT (signal transducers and activators of transcription) signaling pathway.
SYK(spleen tyrosine kinase) is a non-receptor tyrosine kinase, and present in the cell matrix. SYK is widely expressed in hematopoietic cells, lymphocytes, fibroblasts and vascular endothelial cells. It is highly expressed in B lymphocytes and plays an important role in tumors and autoimmune diseases. Dectin-1/ITAM is a classical pathway of antigen stimulated immune cells to induce immune diseases. In normal B cells, when antigen induced BCR crosslinks to phosphorylate the intracellular immune receptor tyrosinase activation motif (ITAM), SYK in the cytosol is the first target recruited and activated by ITAM, and the activated SYK then activates the transcription factor NF-KB through a CARD9 dependent pathway to produce a series of inflammatory factors. In addition, this pathway can also activate Caspase-8, and the activated Caspase-8 cleaves IL-10 precursor, promotes the immature IL-1β to maturation. CARD9-independent NLRP3 signaling pathway also plays a role in the maturation of the immature IL-1β. Therefore, SYK is also an important target of autoimmune diseases.
Psoriasis is an immune-mediated chronic, recurrent, inflammatory skin disease. The prevalence rate varies significantly across the world, ranging from 0.5% to 3.15% in the United States and 0.75% to 2.9% in Europe. China reported a psoriasis prevalence rate of 0.123% in 1984, a prevalence rate of 0.47% in six cities surveyed in 2008, and a prevalence rate of 0.5% in four provinces in Southwest China in 2017. There are more than 6 million psoriasis patients in China Psoriasis can occur at any age without sex differences. About ⅔ of patients have onset before the age of 40, and most patients have severe symptom in winter and mild symptom in summer.
The etiology and pathogenesis of psoriasis have not yet been fully clarified, and may involve genetic, immune, environmental and other factors. Through the immune response mediated mainly by T lymphocytes and participated together by a variety of immune cells, psoriasis causes excessive proliferation of keratinocytes and inflammation of joint synoviocytes and chondrocytes. The typical clinical manifestation of psoriasis is scaly erythema or plaque, which is localized or widely distributed. Psoriasis can be associated with other systemic abnormalities, such as visceral and joint damage Moderate to severe patients have an increased risk of metabolic syndrome and atherosclerotic cardiovascular disease.
According to the clinical manifestations and pathological characteristics of psoriasis, it can be divided into the following types: 1. Psoriasis vulgaris: the most common type and most being acute onset. The typical manifestation is erythema with clear boundaries and various shapes and sizes, which are surrounded by inflammatory flush. There is slight infiltration and thickening, and the surface is covered by multiple layers of silver-white scales. It is easy to scratch off the scales, and when the scales are cleaned off, there is a translucent thin film that is light red and bright. If the thin film is broken, slight bleeding can be observed (Auspitz sign). Skin lesions usually occur on the head, the pars sacralis and the extensor aspect of limbs. Some patients are self-conscious of different degrees of pruritus. 2. Pustular psoriasis: divided into generalized pustular psoriasis and palmar and plantar pustula psoriasis. Generalized pustular psoriasis is characterized by clusters of superficial sterile pustules on erythema, some of which may coalesce into pustular lakes. It can occur anywhere on the body and can be seen in the flexed and wrinkled parts of the limbs more commonly, and the oral mucosa can be involved at the same time. Acute onset or sudden exacerbation is often accompanied by systemic symptoms such as chills, pyrexia, arthrodynia, general malaise, and increased white blood cell count. It appears as periodic attacks and psoriasis vulgaris lesions often appear in the remission period. The palmoplantar pustulosis lesions are limited to hands and feet, occur symmetrically, are generally in good condition, the condition is stubborn, and occur repeatedly. 3. Erythrodermic psoriasis: also known as psoriatic exfoliative dermatitis. It is a serious psoriasis. It is often caused by external use of highly irritating medicaments, long-term massive application of glucocorticoids, and rapid reduction or sudden withdrawal of medicaments. It is manifested by diffuse flushing, swelling, and desquamation of the whole body's skin, accompanied by pyrexia, chilliness, discomfort, and other systemic symptoms, swelling of superficial lymph nodes, and increased white blood cell count. 4. Psoriasis arthropathica: also known as psoriatic arthritis. Psoriasis patients have rheumatoid arthritis-like joint damage at the same time, which can involve the whole body joints, but the terminal finger (toe) intersegmental joint disease is the most characteristic. The affected joints are red-swollen and painful, and the skin around the joints is often red-swollen. Joint symptoms are often aggravated or alleviated at the same time as skin symptoms. Blood rheumatoid factor is negative.
Nowadays, there is no specific therapy for psoriasis, and the main treatment methods include a local treatment, a physical treatment, a systemic treatment, a Chinese medicine treatment and other therapies. Among them, the local treatment includes a treatment with a medicament for external use, a physical therapy, and the like. The medicament for external use mainly includes vitamin D3 analogues, glucocorticoids, anthralin, tretinoin gel and cream, tars, immunosuppressants, and the like, and other medicaments for external use such as Tacrolimus, pimecrolimus, 0.03% camptothecin ointment, 5% salicylic acid ointment, and the like. The medicament for systemic treatment includes methotrexate, tretinoins, ciclosporin, tacrolimus, mycophenolate mofetil, biological agent such as etanercept, infliximab, and antibiotics. For moderate and severe patients, a combined, alternate or sequential treatment is usually given when a single treatment is not good. The current treatments have significant short-term effects but will produce many side effects together with high recurrence rate, and the long-term effects are not satisfactory, for example: the therapeutic dose of methotrexate is very close to its toxic dose; the main side effect of tretinoins is teratogenicity; the adverse effects of ciclosporin A s include nephrotoxicity, hypertension, nausea, emesia, hypodynamia, amyostasia, urinary irritation symptoms and the like; the adverse effects of tacrolimus are similar to those of ciclosporin A; the adverse effects of mycophenolate mofetil include gastrointestinal symptoms, anemia, leucopenia, increased risk of infection and tumor induction, and the like.
Atopic dermatitis (AD), also referred to as atopic eczema and genetic allergic dermatitis, is an allergic skin disease characterized by skin pruritus and pleomorphic rash. It has different clinical manifestations at different ages. It is a chronic, recurrent, inflammatory skin disease. It is considered as a systemic disease since the patients are often concurrent with other atopic diseases such as allergic rhinitis and asthma. The prevalence of AD has gradually increased worldwide in the past 30 years. The prevalence of AD in children in developed countries has reached 10%-20%. The increase in the prevalence of AD in China is later than that in western developed countries, Japan and South Korea, but it has increased rapidly in the past 10 years. The overall prevalence of AD in school-age adolescents (6-20 years old) was 0.70% in 1998, the prevalence in preschool children (1-7 years old) in 10 cities was 2.78% in 2002, and the prevalence in children aged 3-6 years in Shanghai region was up to 8.3% in 2012. In 2014, the prevalence of AD in children aged 1-7 years in 12 cities in China reached 12.94%, and the prevalence of AD in infants aged 1-12 months reached 30.48%.
The pathogenesis of AD is closely related to genetic and environmental factors and the like. Although the exact pathogenesis is still unclear, it is currently believed that immunologic abnormality, skin barrier dysfunction, skin dysbacteriosis and other factors are important links in the pathogenesis. AD usually first occurs in infancy, patients attacked by AD before the age of 1 account for about 50% of all patients. It has a chronic course and a variety of clinical manifestations. The most basic features are xerosis cutis, chronic eczema-like skin lesions and obvious pruritus. Some patients may have other anaphylactic diseases at the same time, such as allergic asthma, allergic rhinoconjunctivitis, etc. In addition, due to the long-term chronic inflammatory reaction, patients with chronic disease course have significantly higher risk of concurrent nervous system disease, inflammatory bowel disease, rheumatoid arthritis, cardiovascular disease and lymphoma.
At present, the treatment of AD includes the basic treatment (avoiding contact allergy, etc.), the treatment with medicaments for external use (glucocorticoids for external use and calcineurin inhibitors for external use, etc.), systemic treatment (oral antihistamine medicaments, immunosuppressants, glucocorticoids, etc.), ultraviolet treatment and antimicrobial treatment, in which medicaments for external use, hormones, and immunosuppressants are predominant. A stepwise treatment mode is usually used to treat mild to moderate patients. Although the existing treatment methods can alleviate the symptoms, there are still some limitations and many adverse effects. There are still many unmet needs for prompt onset of action, pruritus control, and recurrence prevention.
Lupus erythematosus (LE) is a typical autoimmune connective tissue disease, which can be divided into discoid lupus erythematosus (DLE), subacute cutaneous lupus erythematosus (SCLE), systemic lupus erythematosus (SLE), lupus erythematosus profundus (LEP), neonatal lupus erythematosus (NLE), medicament-induced lupus erythematosus (DIL) and other subtypes.
Discoid lupus erythematosus, which mainly invades the skin, is the lightest type of lupus erythematosus. A few cases may have mild visceral damage, a few cases may turn into systemic lupus erythematosus, and most patients have skin lesions without subjective symptoms, but it is difficult to completely subside. Subacute cutaneous lupus erythematosus is a special intermediate type, which is relatively rare clinically. Skin lesions often occur repeatedly. The vast majority of patients have visceral damage, but few are serious. The main symptoms are arthralgia, myalgia, and recurrent low fever. A minority of patients have nephritis and blood system changes. Lupus erythematosus profundus, also known as lupus panniculitis and lupus erythematosus profundus, is also an intermediate type of lupus erythematosus. It is unstable in nature and can exist alone. Later, it can be transformed into either discoid lupus erythematosus or systemic lupus erythematosus, or coexists with them. Neonatal lupus erythematosus, characterized by erythema annulare on the skin and is congenital heart block, is self limiting and generally subsides within 4-6 months after birth. Cardiac lesions often persist. The main manifestations of medicament-induced lupus erythematosus are pyrexia, arthralgia, myalgia, facial butterfly erythema, dental ulcer, and possibly serositis, which gradually improves after medicament withdrawal. Patients with preponderant disease situations can be provided with medicament treatment.
Systemic lupus erythematosus (SLE) is a systemic autoimmune disease, which is the most serious type of lupus erythematosus. It is characterized by systemic multi-system and multi-organ involvement, repeated recurrence and remission, and the presence of a large number of autoantibodies in the body. If not treated in time, it will cause irreversible damage to the affected organs and eventually lead to the death of patients. There are large regional differences in the prevalence of SLE. At present, the global prevalence of SLE is 0-241/100,000, the prevalence of SLE in the mainland of China is 30-70/100,000, and the prevalence ratio of male to female is 1:10-12. The specific pathogenic factors of SLE have not yet been fully defined. It is caused by the involvement of multiple factors, and mainly related to genetic, infection, endocrine, and environmental factors. Defects in immunoregulation mechanisms, such as the clearance of apoptotic cells and immune complexes, are also important factors in the occurrence of SLE. The lost immune tolerance, the increased antigen load, the excessive T cell assistance, the defective B cell suppression, and the transition from Th1 cells to Th2 cells lead to the hyperactivation of B cells and the production of pathogenic autoantibodies. In addition, some medicaments such as methyldopa, phenytoin sodium, penicillamine, quinidine, and propranolol can directly cause medicament-induced lupus and aggravate lupus erythematosus. The vast majority of SLE patients have multisystem damage manifestations at the onset. A minority of patients develop from other types of lupus erythematosus. Some patients also have other connective tissue diseases, such as scleroderma, dermatomyositis, and Sjogren's syndrome, forming various overlap syndromes.
At present, the medicament treatment of SLE is the medication based on glucocorticoids and hydroxychloroquines. However, the treatment with the above medicaments will produce corresponding side effects, such as infection, liver and kidney function damage and metabolic abnormalities, and sometimes have to reduce the amount used or stop the medicament. At present, there is still no good medicament to control the development of the disease, and it is still necessary to continue to develop new medicaments. SYK and JAK are respectively upstream of two different signaling pathways that induce SLE, so SYK-JAK dual channel inhibitors are expected to be an effective way to treat SLE. Currently, there is no JAK-SYK dual target inhibitor approved for marketing. R333, a JAK-SYK dual target inhibitor product with DLE as the development indication, has also been terminated due to a phase II clinical failure on Oct. 24, 2013.
Therefore, there is a need to develop new medicaments for the treatment of autoimmune diseases, especially immune-mediated skin diseases and autoimmune connective tissue diseases such as psoriasis, atopic dermatitis or lupus erythematosus.
Compound (I) with the Following Structural Formula (I):
its chemical name is: (R)-4-(cyclopropylamino)-2-((3 -(cyclopropylsulfonyl)-1,2,3,4,4a,5-hexahydrobenzo[b]pyrazolo[1,2-d][1,4]oxazin-8-yl)amino)pyrimidine-5-arboxamide, which was first disclosed in the PCT international application with publication number of WO2018108084, and is known to be a highly selective JAK kinase and Syk kinase dual target inhibitor and can be used to treat cancer.
The present inventors have found through further research that Compound (I) plays a regulatory role in the cell signal transduction, division and proliferation by inhibiting JAK and SYK kinases, and has a superior effect in the treatment of autoimmune diseases, especially shows satisfactory activity and low toxicity and side effect in the treatment of immune-mediated skin diseases and autoimmune connective tissue diseases such as psoriasis, atopic dermatitis and lupus erythematosus.
The present invention provides the use of Compound (I), an optical isomer thereof or a pharmaceutically acceptable salt thereof in manufacture of a medicament for treating a disease related to high expression or abnormal activation of JAK and SYK kinases:
Preferably, in the above-mentioned use, the JAK kinase is one or more of JAK1, JAK2, JAK3 or TYK2 kinase, preferably JAK3 and/or TYK2 kinase.
Preferably, in the above-mentioned use, the disease related to high expression or abnormal activation of JAK and SYK kinase is an autoimmune disease.
Preferably, in the above-mentioned use, the autoimmune disease is an immune-mediated skin disease or an autoimmune connective tissue disease.
Preferably, in the above-mentioned use, the immune-mediated skin disease is psoriasis or atopic dermatitis, the psoriasis is preferably psoriasis vulgaris, pustular psoriasis, erythroderma psoriaticum or psoriasis arthropathica; the autoimmune connective tissue disease is lupus erythematosus, the lupus erythematosus is preferably discoid lupus erythematosus, subacute cutaneous lupus erythematosus, systemic lupus erythematosus, lupus erythematosus profundus, neonatal lupus erythematosus, medicament-induced lupus erythematosus, further preferably systemic lupus erythematosus.
Further, in the above-mentioned use, the medicament contains a therapeutically effective amount of Compound (I), an optical isomer thereof or a pharmaceutically acceptable salt thereof, and optionally a pharmaceutically acceptable excipient or carrier.
There are no special restrictions on the administration mode of the medicament of the present invention, and the representative administration mode includes but is not limited to oral, rectal, parenteral (intravenous, intramuscular or subcutaneous) and topical administration. Accordingly, the medicament of the present invention may be made into various clinically acceptable dosage forms, including oral dosage forms, injection dosage forms, topical dosage forms, external dosage forms, or the like.
Preferably, the medicament of the present invention may be clinically used alone or in combination with other therapeutic component(s). To facilitate the clinical use, Compound (I), an optical isomer thereof or a pharmaceutically acceptable salt thereof of the the present invention can be combined with other therapeutic component(s) to prepare compound medicaments or combination products.
The present invention also provides a method for using the medicament, that is, applying a therapeutically effective amount of Compound (I), an optical isomer thereof or a pharmaceutically acceptable salt thereof of the present invention to a mammal (such as human) in need thereof.
The present invention provides a method for treating a disease related to high expression or abnormal activation of JAK and SYK kinases, which is characterized by applying a therapeutically effective amount of Compound (I), an optical isomer thereof or a pharmaceutically acceptable salt thereof of the present invention to a mammal (such as human) in need thereof.
The JAK kinase of the present invention is one or more of JAK1, JAK2, JAK3 or TYK2 kinase, preferably JAK3 and/or TYK2 kinase. The disease related to high expression or abnormal activation of JAK and SYK kinase of the present invention is an autoimmune disease, such as an immune-mediated skin disease and an autoimmune connective tissue disease, the immune-mediated skin disease is psoriasis or atopic dermatitis, the psoriasis is preferably psoriasis vulgaris, pustular psoriasis, erythroderma psoriaticum or psoriasis arthropathica; the autoimmune connective tissue disease is lupus erythematosus, the lupus erythematosus is preferably discoid lupus erythematosus, subacute cutaneous lupus erythematosus, systemic lupus erythematosus, lupus erythematosus profundus, neonatal lupus erythematosus, medicament-induced lupus erythematosus, further preferably systemic lupus erythematosus.
The present invention also provides a medicament containing a therapeutically effective amount of compound (I), an optical isomer thereof or a pharmaceutically acceptable salt thereof, which is characterized in that the medicament is useful for treating a disease related to high expression or abnormal activation of JAK and SYK kinases in a subject, wherein said disease is an autoimmune disease, such as an immune-mediated skin disease and an autoimmune connective tissue disease, the immune-mediated skin disease is psoriasis or atopic dermatitis, the psoriasis is preferably psoriasis vulgaris, pustular psoriasis, erythroderma psoriaticum or psoriasis arthropathica; the autoimmune connective tissue disease is lupus erythematosus, the lupus erythematosus is preferably discoid lupus erythematosus, subacute cutaneous lupus erythematosus, systemic lupus erythematosus, lupus erythematosus profundus, neonatal lupus erythematosus, medicament-induced lupus erythematosus, further preferably systemic lupus erythematosus.
The JAK kinase is one or more of JAK1, JAK2, JAK3 or TYK2 kinase, preferably JAK3 and/or TYK2 kinase.
The present invention also provides a compound medicament or combination product, containing a therapeutically effective amount of Compound (I), an optical isomer thereof or a pharmaceutically acceptable salt thereof, and other therapeutic component(s), which is characterized in that the compound medicament or combination product is useful for treating a disease related to high expression or abnormal activation of JAK and SYK kinases in a subject, wherein said disease is an autoimmune disease, such as an immune-mediated skin disease and an autoimmune connective tissue disease, the immune-mediated skin disease is psoriasis or atopic dermatitis, the psoriasis is preferably psoriasis vulgaris, pustular psoriasis, erythroderma psoriaticum or psoriasis arthropathica; the autoimmune connective tissue disease is lupus erythematosus, the lupus erythematosus is preferably discoid lupus erythematosus, subacute cutaneous lupus erythematosus, systemic lupus erythematosus, lupus erythematosus profundus, neonatal lupus erythematosus, medicament-induced lupus erythematosus, further preferably systemic lupus erythematosus.
The JAK kinase is one or more of JAK1, JAK2, JAK3 or TYK2 kinase, preferably JAK3 and/or TYK2 kinase.
The therapeutically effective amount mentioned in the present invention refers to the pharmaceutically effective administration dose, that is, the amount of the active compound is sufficient to significantly improve the condition without causing serious side effects. For a person with a body weight of 60 kg, the daily administration dose is usually 0.01-2000 mg, preferably 1-500 mg, more preferably 10-400 mg, further preferably 15-360 mg or 15-250 mg, such as 15 mg, 45 mg, 60 mg, 90 mg, 135 mg, 180 mg, 240 mg, 300 mg, 360 mg. It can be administered in a single dose once a day, in multiple doses in a day, or at intervals. For the specific dose and the frequency of administration, the factors such as the route of administration and the health status of patients should be considered, and these can be determined by skilled physicians according to routine skills. There are no special restrictions on the administration mode, and the representative administration mode includes but is not limited to oral, rectal, parenteral (intravenous, intramuscular or subcutaneous) and topical administrations. The amount of the active compound is calculated as Compound (I).
In vivo and in vitro studies show that (1) Compound (I) of the present invention can significantly inhibit the kinase activities of JAK1, JAK2, JAK3, TYK2, and SYK in vitro, and has strong inhibitory effects on JAK3 and TYK2, with IC50s of 1.43 nM and 0.82 nM respectively. The inhibitory effects on JAK2 and SYK are slightly weaker than those on JAK3 and TYK2, with IC50s of 3-8 nM. The inhibitory effect on JAK1 is the weakest, with an IC50 of 20.04 nM. (2) Compound (I) of the present invention can improve or significantly reduce the skin thickness, the ear thickness, the spleen weight, the spleen index, the PASI scores (red swelling, scale, thickness and total score), the mouse skin epidermal thickness, the skin pathology score, and the content of IL-6 and TNF-α in the skin tissue of the IMQ-induced psoriasis model mice. (3) Compound (I) of the present invention can improve or significantly reduce the skin thickness and the skin clinical score of oxa induced atopic dermatitis model mice; and can improve the skin inflammatory cell aggregation, the edema and the telangiectasia in the modeling area, and significantly reduce the pathological score and the epidermal thickness. (4) Compound (I) of the present invention can dose-dependently improve the skin lesions of MRL/lpr lupus erythematosus model mice, alleviate the kidney injury, reduce the enlargement of the lymph nodes and spleen, and inhibit the increase of the SLE related antibodies and cytokines in the serum. Among others, after 7 weeks of the administration in the 20 mg/kg group of mice, the lymphadenectasis of the SLE mice can be effectively inhibited. The indicator evaluation results at the end of the test show that the administration at 20 mg/kg can effectively inhibit the splenomegaly and the lymphadenectasis, and the total pathological score of double kidneys in the chronic index (CI) decreases significantly, and the overexpression of IL-6 and TNF-alpha in the serum can also be inhibited. The administration at doses of 40 mg/kg and 60 mg/kg can comprehensively improve various symptoms of the SLE mice, including improving the skin lesions (the skin destruction score and the skin pathological score), alleviating the kidney injury (reducing the mouse urine protein and decreasing the kidney immune complex deposition), and inhibiting the immune organ enlargement (improving the lymph node pathological score and inhibiting the spleen and lymph node enlargement).
The above research results show that Compound (I) , an optical isomer thereof or a pharmaceutically acceptable salt thereof of the present invention can improve the skin lesions of the psoriasis mice and the atopic dermatitis mice and inhibit the immune organ enlargement; can also dose-dependently improve the skin lesions of the SLE mice, inhibit the immune organ enlargement, alleviate the renal function damage, reduce the level of inflammation, and has a certain safe therapeutic window, resulting in a good clinical application prospect.
The present invention is further described below in combination with specific examples. It should be understood that these examples are only used to illustrate the present invention and not to limit the scope of the invention. The experimental methods for which no specific conditions are indicated in the following examples are generally based on conventional conditions or according to conditions recommended by the manufacturer.
Each substance was weighed and then dissolved in an aqueous solution containing 0.4% Tween 80 and 0.5% methylcellulose; Compound (I) was prepared into the concentrations of 0.3 mg/mL, 1 mg/mL, 2 mg/mL, 3 mg/mL, 4 mg/mL and 6 mg/mL respectively; and the positive control medicaments were prepared with normal saline into the concentration of 0.3 mg/mL or 0.6 mg/mL, and diluted to the required concentration just before the use.
5.0 g of methylcellulose powder was weighed and added into a clean glass bottle, 900 mL of sterile water was added, and the mixture was stirred overnight until fully dissolved; 4.0 mL of Tween 80 was suctioned, and the mixture was fully stirred and uniformly mixed. The volume was fixed to the final volume of 1000 mL. The solution was preserved in a refrigerator at 4° C.
Preparation of acetone/olive oil (4/1) vehicle: 40 mL of acetone and 10 mL of olive oil were mixed and oscillated for 30 seconds until mixed uniformly to produce the acetone/olive oil (4/1) vehicle.
Preparation of 5% OXA: 100.00 mg of OXA was weighed, dissolved in 2.00 mL of acetone/olive oil (4/1), and oscillated for 30 seconds.
Preparation of 0.1% OXA: 15.69 mg of OXA was weighed, dissolved in 15.69 mL of acetone/olive oil (4/1), and oscillated for 30 seconds. It was prepared when used and prepared once every three days.
Protein kinase activity was determined by Mobility Shift Assay. Compound (I) was dissolved in DMSO and prepared into concentration gradients in 100% DMSO. By the dilution with the kinase buffer, 5 μL of Compound (I) (10% DMSO) was added to a 384-well plate at 5 folds of the final reaction concentration. 10 μL of 2.5-fold enzyme solution was added and the incubation was performed at room temperature for 10 min, followed by the addition of 10 μL of 2.5-fold substrate solution. The incubation was performed at 28° C. for 60 min and 30 jEL of stop solution was added to the 384-well reaction plate to terminate the reaction (100 mM HEPES, pH 7.5, 0.015% Brij-35, 0.2% Coating Reagent #3, 50 mM EDTA). The conversion data was copied from the Caliper EZ Reader, and converted into the inhibition data, % inhibition=(max-conversion)/(max-min)×100%, wherein, “min” is the conversion for the control sample well where the reaction was performed without adding the enzyme; and “max” is the conversion for the control well where DMSO was added. The curve was drawn with the compound concentration and the inhibition rate as the horizontal and vertical is coordinates, and the IC50 value was calculated by fitting with XLFit excel add-in version 5.4.0.8. Fitting equation:
Y=Bottom+(Top-Bottom)/(1+(IC50/X){circumflex over ( )}HillSlope).
The test result for the kinase inhibitory activity of Compound (I) was shown in the table below:
The purpose of this test was to evaluate the pharmacodynamics of Compound (I) in the IMQ (5% imiquimod cream cream)-induced mouse psoriasis model. One of the clinical adverse effects of imiquimod is to induce the onset of psoriasis. The imiquimod-induced mouse psoriasis model is simple to operate and easy to implement, and possesses the following advantages: complex interactions between tissues exist for skin phenotype and pathological characteristics: the model is similar to clinical psoriasis.
The animals were randomly divided into seven groups according to the body weights on the day before the start of the experiment. See Table 2 for details:
The animals were shaved on their back one day before applying the medicament, forming a skin exposure area having a size of about 2 cm×3 cm. The mice were induced by IMQ, and applied with 62.5 mg of 5% imiquimod cream on the bare back and the right ear at regular intervals every day for 14 days. Mice in the normal control group were applied with vaseline on the bare back and the right ear at regular intervals every day.
The skin thickness was measured daily from the first day of the test until the end of the test.
The skin thickness measurement method was as follows: the back skin and the subcutaneous tissue of the mouse were pinched with the thumb and the index finger of the left hand in the same direction as the mouse body; the skinfold thickness was measured 1 cm away from the pinched part of the left hand (near the center of the molding part) with a digital thickness gauge (with millesimal reading) held in the right hand (model BK-3281, manufacturer: Shanghai Niuhui). The thickness was in mm, and the actual thickness was the half of the measured thickness (the skin thickness=the measured value/2).
The test results showed that compared with the normal control group, the skin thickness of mice in the model group was significantly increased after being stimulated with 5% imiquimod cream for 14 consecutive days. At the end point of the study, the treatment with Compound (I) (3 mpk, 10 mpk, 30 mpk and 60 mpk) and dexamethasone (3 mpk) significantly inhibited the increase of the skin thickness (all 5 groups: p<0.001 vs the model group). See Table 3 for details.
The ear thickness was measured daily (at the center of the auricle).
The test results showed that compared with the normal control group, the stimulation with 5% imiquimod cream for 14 consecutive days significantly increased the right ear thickness of mice. At the end point of the study, the treatment with Compound (I) (3 mpk, 10 mpk, 30 mpk and 60 mpk) and dexamethasone (3 mpk) significantly inhibited the increase of the ear thickness (all 5 groups: p<0.001 vs the model group). Compound (I) inhibited the increase of the ear thickness in a dose-dependent manner See Table 4 for details.
Skin photographs were taken daily from the first day of the test until the end of the test.
The clinical symptoms were evaluated with the PASI evaluation standard from three indicators of the erythema (Erythema), the scale (Scaling) and the skin thickness (Thickness), and scored with 0-4 points. The total score was obtained by summing the three scores. The PASI evaluation standard was as follows: 0, asymptomatic; 1, mild; 2, moderate; 3, severe; 4, extremely severe.
Erythema: 0—no erythema visible; 1—light red; 2—red; 3—dark red; 4—extremely dark red.
Scaling: 0—no visible scale on the skin surface; 1—part of the skin lesion surface covered with scales; 2—most of the skin lesion surface covered with scales; 3—almost all of the skin lesion region covered with scales; 4—all of the skin lesion region covered with scales.
Skin thickness: 0—smooth skin without wrinkles; 1—slight wrinkles at the edges of the skin, or the rough skin; 2—slight wrinkles or slight humps appeared at all of skin lesions; 3—the wrinkle degree of the skin lesion was further deepened, or the skin lesion was significantly thickened with obvious humps; 4—the skin lesion was completely wrinkled, or the skin lesion was significantly thickened with obvious protuberances.
Dryness and pruritus are not included in the total score.
The test results showed that the PASI scores of the erythema, the scale, the skin thickness and the total score of the mice in the model group were significantly increased after being stimulated with 5% imiquimod cream for 14 consecutive days. At the end point of the study, the treatment with Compound (I) (3 mpk) significantly improved the scale score (p<0.001 vs the model group) and the total score (p<0.05 vs the model group); the treatment with Compound (I) (10 mpk and 30 mpk) significantly improved the scale score (the group of 10 mpk: p<0.01 vs the model group; the group of 30 mpk: p<0.001 vs the model group), the skin thickness score (both groups: p<0.001 vs the model group) and the total score (the group of 10 mpk: p<0.01 vs the model group; the group of 30 mpk: p<0.001 vs the model group); The treatment with Compound (I) (60 mpk) and dexamethasone (3 mpk) significantly improved the erythema score, the scale score, the skin thickness score and the total score (both groups: p<0.001 vs the model group). See Table 5 for details.
On the 14th day of the test, the spleen weight was collected.
The test results showed that the treatment of Compound (I) (10 mpk, 30 mpk and 60 mpk) and dexamethasone (3 mpk) significantly inhibited the increase in the spleen weight (the group of 10 mpk of Compound (I): p<0.05 vs the model group; all of the other three groups: p<0.001 vs the model group); and the treatment of Compound (I) (30 mpk and 60 mpk) and dexamethasone (3 mpk) significantly inhibited the increase in the spleen index (all of the three groups: p<0.001 vs the model group). See Table 6 for details.
After the test, all mice were euthanized by excessive inhalation of carbon dioxide. The skin was collected and divided into four parts, one of which was fixed in a tissue fixative solution for 24 hours for the pathological is detection. It was dehydrated, then embedded in paraffin and made into 4-micron sections. Skin sections were stained with hematoxylin eosin to observe the infiltration of the stratum corneum, the epidermal layer, the dermis layer and the inflammatory cell. When measuring the thickness of the epidermal layer, the stained skin sections were scanned with a Leca Aperio CS2 scanner at 200×magnification, and then the histopathological changes were observed and scored.
The specific criteria of the pathological score were as follows: munro microabscess found in the epidermal layer 2.0 points; hyperkeratosis 0.5 points; parakeratosis 1.0 points; the thinning or disappearing of the granular layer 1.0 points; the thickening of acanthosis 1.0 points; the extension and fluctuation of cuticular process 0.5, 1.0 and 1.5 points respectively according to the mild, moderate and severe degrees. The monocyte or coenocyte infiltration in the dermis layer 0.5, 1.0 and 1.5 points respectively according to the mild, moderate and severe degrees; the extension of mastoid process 0.5 points; and telangiectasia 0.5 points.
When measuring the thickness of the epidermal layer, the stained skin sections were scanned with a Leca Aperio CS2 scanner at 200×magnification, and then the scanned images were opened with HALO analysis software. A “typing” template in the software was used to define the skin epidermis as an annotation layer, the epidermis was divided into upper and lower segments in the annotation layer, and then about 200 thickness values in the segments were calculated with the “layer thickness” option. The epidermal thickness of each section was represented by the average value of epidermal thickness.
The test results indicated that Group 1, the normal control group showed that the intact skin structure was visible under the microscope and the cell morphology was normal without obvious abnormal changes. The skin of Group 2, the model group, showed visible Munro microabscess, hyperkeratosis or parakeratosis, and acanthosis thickening, accompanied by obvious hemangiectasis, and moderate to severe inflammatory cell infiltration. Compared with Group 1, the normal control group, the stimulation with 5% imiquimod cream for 14 consecutive days significantly increased the pathological score of skin tissue. The treatment with Compound (I) (60 mpk) and dexamethasone (3 mpk) significantly improved the pathological score of the skin tissue of the model mouse (the group of 60 mpk of Compound (I): p<0.01 vs the model group; the dexamethasone group: p<0.001 vs the model group). Compared with Group 1, the normal control group, the skin epidermal thickness of Group 2, the model group significantly increased. The treatment with Compound (I) (30 mpk and 60 mpk) and dexamethasone (3 mpk) significantly reduced the epidermal thickness of the model mouse (Group 2 of Compound (I): p<0.05 vs the model group; the dexamethasone group: p<0.001 vs the model group). See Table 7 for details.
5.6 Detection of Inflammatory Factors in Skin samples
After the test, all mice were euthanized by excessive inhalation of carbon dioxide (CO2), and the skin was collected and divided into four parts, three of which were quickly frozen in liquid nitrogen and stored in a −80° C. refrigerator for the inflammatory factor detection.
IL-6 and TNF-alpha were detected by the ELISA method.
Tissue specimen: a certain amount of skin tissue was weighed, a certain amount of PBS (pH=7.4) was added, and the specimen was sufficiently homogenized by hand or with a homogenizer. The specimen was centrifuged for 20 min (2000-3000 rpm). The supernatant was carefully collected. After subpackaging, one was to be tested, and the rest was frozen for standby.
The test results showed that Compound (I) (3 mpk, 10 mpk, 30 mpk and 60 mpk) and dexamethasone (3 mpk) significantly reduced the content of IL-6 in the skin (the groups of 3 mpk and 60 mpk of Compound (I): p<0.001 vs the model group; the groups of 10 mpk and 30 mpk of Compound (I) and the dexamethasone group: p<0.01 vs the model group) and the content of TNF-alpha in the skin (the group of 30 mpk of Compound (I): p<0.001 vs the model group; the group of 10 mpk of Compound (I): p<0.05 vs the model group; the groups of 3 mpk and 60 mpk of Compound (I) and the dexamethasone group: p<0.01 vs the model group). See Table 8 for details.
The purpose of this test was to evaluate the pharmacodynamics of Compound (I) in the OXA-induced Balb/c mouse atopic dermatitis model. Repeated OXA stimulation of the dorsal skin of mice could produce a long-term inflammatory reaction. This model was closer to the clinical skin inflammation and was a common model for screening and evaluating compounds with anti-inflammatory activity.
Tested medicament: Compound (I)
Positive control medicament: dexamethasone (Dex)
Vehicle (0.4% Tween 80/0.5% methyl cellulose).
Female Balb/c mice aged 8-9 weeks, number: 70
According to the body weight of animals in each group before administration, they were randomly divided into 7 groups with 10 animals in each group. See Table 9 for details.
Mice were randomly divided into 7 groups according to the body weight, as shown in Table 9 above. OXA induction was performed on the 7th day. The induction mode was to apply 5% OXA (dissolved in the acetone/olive oil (4/1) solvent) to the back of mice near the neck in an amount of 10 μL (1.5 cm×1.5 cm). Mice in the normal control group were applied with 10 μL of the acetone/olive oil (4/1) solvent in the same way. From the 1st da to 22nd day, the immunostimulation was performed, and 100 μL of 0.1% OXA (dissolved in the acetone/olive oil (4/1) solvent) was evenly applied on the back of mice near the neck. The application was performed every two days. Mice in the normal control group were applied with 100 μL of the acetone/olive oil (4/1) solvent in the same way. On the day of the immunostimulation, measuring the skin thickness, clinically scoring and photographing were required, and the OXA application was carried out after the above work was completed.
is The administration dose of the compound was shown in Table 9. Compound (I) was administered by gavage twice a day (PO, bid) from the 1st to 22nd day. The administration was performed in the morning and completed before measuring the skin thickness, clinically scoring, photographing, and the OXA immunostimulation. The interval between two administrations was 8 hours.
5.1 Influence of Compound (I) on the Body Weight of Mice with the OXA-Induced Atopic Dermatitis
Body weight data were recorded twice a week.
The test results showed that the OXA stimulation had no significant influence on the body weight of mice. At the end of the study, Compound (I) (3 mpk, 10 mpk, 30 mpk and 60 mpk) had no significant influence on the body weight of mice; and the body weight of mice decreased significantly after the dexamethasone treatment. See Table 10 for details.
5.2 Influence of Compound (I) on the Skin Thickness of Mice with the OXA-Induced Atopic Dermatitis
Skin thickness (1.5 cm×1.5 cm, the modeling area) was measured with a Mitutoyo digital indicator (Mitutoyo digimatic indicator, Type ID-C, USA) from the 1st to 22nd day. The measurement was performed every two days. If the skin thickness measurement and the OXA immunostimulation were performed on the same day, the skin thickness measurement would be preferred.
The test results showed that after the OXA immunostimulation, the thickness of the dorsal skin of mice (1.5 cm×1.5 cm, the modeling area) significantly increased. From the 17th day, compared with the model group, Compound (I) (30 mpk and 60 mpk) significantly inhibited the increase in the skin thickness of the modeling area (the group of 30 mpk on the 17th and 22nd days: p<0.05 vs the model group; the group of 60 mpk on the 17th and 22nd days: p<0.01 vs the model group). From the 7th day, compared with the model group, dexamethasone significantly inhibited the increase in the skin thickness (the 7th day: p<0.01 vs the model group; the 17th and 22nd days: p<0.001 vs the model group). See Table 11 for details.
5.3 Skin Clinical scoring of Compound (I) on the Mice with the OXA-Induced Atopic Dermatitis
The skin in the modeling area was clinically scored according to the skin scoring criteria in Table 12 from the 1st to 22nd day and evaluated every two days. If the skin clinical scoring and the OXA immunostimulation were performed on the same day, the skin clinical scoring would be preferred.
The test results showed that after the OXA immunostimulation, the skin clinical score in the modeling area of mice increased significantly. From the 19th day, compared with the model group, Compound (I) (30 MPK and 60 MPK) significantly inhibited the increase of skin clinical score (both p<0.05 vs model group). From the 9th day, compared with the model group, dexamethasone significantly inhibited the increase in the skin clinical score (the 9th day: p<0.05 vs the model group; the 19th and 22nd days: p<0.001 vs the model group). See Table 13 for details.
At the end of the study, the tissue in the modeling area was stained with hematoxylin eosin for the skin pathological scoring and the epidermal thickness measurement.
After the mice were sacrificed, the dorsal skin was removed and fixed in 10% neutral formalin for 24 hours. It was dehydrated, then embedded in paraffin and made into 4-micron sections. The skin sections were stained with hematoxylin eosin, and the inflammatory cell infiltration and tissue changes in the stratum corneum, the epidermis layer and the dermis layer were observed under the microscope, and the pathological scores were made. The scoring criteria were: inflammatory cell aggregation and edema, which were divided into slight 1 point, moderate 2 points, and severe 3 points; telangiectasia, which was divided into slight 1 point, moderate 2 points, and severe 3 points.
The specific scoring criteria of inflammatory cell aggregation were as follows: (1) slight-1 point: inflammatory cells occupied a small amount of <10% of the dermal area of the skin; (2) moderate-2 points: inflammatory cells occupied 10%-50% of the dermal area of the skin; (3) severe-3 points: the inflammatory cells occupied greater than 50% of the dermal area of the skin.
The specific scoring criteria of skin edema were as follows: (1) slight-1 point: there are occasionally several cell edema at the juncture between the dermis and the epidermis, and the edema cell aggregation length was less than 10% of the length of the juncture between the dermis and the epidermis; (2) moderate-2 points: the length of edema cells occupied 10%-50% of the length of the juncture between the dermis and the epidermis; (3) severe-3 points: the length of edema cells occupied greater than 50% of the length of the juncture between the dermis and the epidermis.
The specific scoring criteria of telangiectasia were as follows: (1) slight-1 point: occasionally 1-3 telangiectasias; (2) moderate-2 points: 3-6 telangiectasias; (3) severe-3 points: greater than 6 telangiectasias.
When measuring the thickness of the epidermal layer, the stained skin sections were scanned with a Leca Aperio CS2 scanner at 200 magnification, and then the scanned images were opened with HALO pathological analysis software. A “typing” template in the software was used to define the skin epidermis as an annotation layer, the epidermis was divided into upper and lower segments in the annotation layer, and then about 100 thickness values in the segments were calculated with the “layer thickness” option. The epidermal thickness of each section was represented by the average value of epidermal thickness.
The test results showed that there were inflammatory cell aggregation, edema and telangiectasia in the skin of the modeling area of the model group. According to the pathological scoring criteria mentioned in the test method, the pathological score of this group reached 6.8. Compared with the model group, Compound (I) (10 mpk, 30 mpk and 60) could significantly reduce the pathological score of the skin in this area after treatment (p<0.01 vs the model group). After the dexamethasone treatment, the pathological score was significantly reduced (p<0.001 vs the model group). The OXA-stimulation significantly increased the thickness of the skin epidermal layer in the modeling area of the mouse back. Compared with the model group, Compound (I) (10 mpk, 30 mpk and 60 mpk) could significantly reduce the epidermal thickness (p<0.05 vs the model group); After the dexamethasone treatment, the thickness of the epidermal layer in this area decreased significantly (p<0.001 vs the model group). See Table 14 for details.
According to the concentration of the serum anti-ds-DNA antibody, female MRL/lpr mice were randomly divided into five groups: model group: solvent (aqueous solution containing 0.4% Tween 80 and 0.5% methylcellulose) 10 mL/kg BID, positive control group: prednisone 6 mg/kg QD, compound (I) 20, 40 and 60 mg/kg BID groups, the administration volumes respectively: 10 mL/kg. In addition, female C57BL/6 mice served as the normal control group. The animals in the Compound (I) group and the model group were administrated with the medicament or the solvent by gavage twice a day starting from the beginning of five weeks of age with an interval of 8 hours between two administrations; prednisone was administered to the animals by gavage once a day from the beginning of five weeks of age; the administration was totally performed for 17 weeks.
Two mice in the model group died at 15 and 16 weeks of administration, respectively, and 8 mice remained at the end of the test; one mouse in the compound (I) 20 mg/kg bid group died in the later period of the 16th week of administration, and 9 mice remained at the end of the test; and no death of mice occurred in other groups.
The skin destructions on the face, ears and back of mice were observed and scored once a week for 17 times totally.
Scoring system: 1) red swelling and bleeding of the skin; 2) the extent of hair loss and skin dryness; 3) edema; 4) excoriation/corrosion; 5) lichenoid sclerotic plaque and other symptoms. The score of each item was as follows: normal=0 points; slight=1 point; moderate=2 points; severe=3 points. The severity of skin destruction was determined according to the total score of each evaluated symptom.
The results showed that compared with the model group, starting from the 14t h week of treatment, the high-dose and medium-dose groups of Compound (I) could effectively inhibit the skin destruction degree of systemic lupus erythematosus mice (the 14th-16th weeks, *p<0.05 vs the model group; the 17th week, **p<0.01 vs the model group), and the positive control medicament prednisone 6 mg/kg group also effectively inhibited the skin destruction degree of the systemic lupus erythematosus mice (the 17th week, **p<0.01 vs the model group). See Table 15 for details.
At the end of the test, the mice were dissected, the skin tissues on the back of mice were stained with HE and scored pathologically.
The results showed that each administration group could improve the skin pathology score to various degrees. The high-dose group of Compound (I) groups showed a statistical difference (**p<0.01 vs the model group), and the positive control medicament prednisone 6 mg/kg group also showed a statistical difference (***p<0.001 vs the model group). See Table 16 and
The lymph nodes of MRL/lpr mice were scored once a week for a total of 17 times during the test.
According to the lymph node diameter (cm), the score values were 0-6 points:
According to the lymph node scoring data, after 7 weeks of administration and treatment, both high and medium doses of Compound (I) could effectively inhibit the lymphadenectasis degree in mice with systemic lupus erythematosus (***p<0.001 vs the model group), while the low-dose group could significantly inhibit the lymphadenectasis in the SLE mice after 7-11 weeks of administration (the 7th-9th weeks, ***p<0.001 vs the model group; the 11th week, *p<0.05 vs the model group), but the difference was no longer obvious from the 12th week to the end of the experiment. The positive control medicament prednisone 6 mg/kg group also effectively inhibited the lymphadenectasis degree of mice with the systemic lupus erythematosus (***p<0.001 vs the model group). See Table 17 for details.
At the end of the test, mice were dissected and the lymph node tissues (submaxillary, axillary and inguinal) were weighed. From the lymph node tissue weight data, compared with the model group, both high and medium doses of Compound (I) could effectively inhibit the lymphadenectasis degree of mice with systemic lupus erythematosus (***p<0.001 vs the model group). See Table 18 and
At the end of the test, mice were dissected and the spleen tissues were weighed. Compared with the model group, all high, medium and low doses of Compound (I) could effectively inhibit the spleen enlargement degree of mice with systemic lupus erythematosus (***p<0.001 vs the model group). See Table 19 and
The urine protein contents of mice were detected during the test, once a week for 16 weeks. According to the urinary protein content at different time, the urinary protein concentration vs time curve was plotted and the area under each curve was calculated.
It could be seen that three dose groups of Compound (I) produced various degrees of improvement on the urinary protein, and the medium and high dose groups of Compound (I) had significant statistical difference in the area under the curve for the time of 16 weeks (*p<0.05 vs the model group). See Table 20 and
At the end of the test, mice were dissected and the kidney tissues were weighed. Compared with the model group, the total pathological score of both kidneys in the high-dose group of Compound (I) was extremely significantly decreased (***p<0.001 vs the model group), and the total pathological score of both kidneys in the medium dose group of Compound (I) was significantly decreased (**p<0.01 vs the model group). See Table 21 and
Kidney HE scoring criteria:
HE staining score results: compared with the model group, in the activity index (AI) score, the total pathological scores of both kidneys in the medium and high dose groups of Compound (I) were significantly decreased (**p<0.01 vs the model group); in the chronicity index (CI) score, the total pathological score of both kidneys in the high dose group of Compound (I) was significantly decreased (**p<0.01 vs the model group), the total pathological score of both kidneys in the low dose group of Compound (I) was relatively remarkably decreased (*p<0.05 vs the model group); in the tubulointerstitial lesions (TIL) score, the total pathological score of both kidneys in the high dose group of Compound (I) was significantly decreased (**p<0.01 vs the model group). See Table 22 and
The positive cell rate of IgG staining and the staining intensity were scored by IHC staining of kidney tissue.
Kidney IHC (IgG) scoring criteria:
The final scoring result was the product of the two, and 0 is negative (−); 1-3 were classified as low expression (+); 4-8 were classified as medium expression (++); 9-12 were classified as high expression (+++).
The results showed that compared with the model group, each dose group of Compound (I) improved IgG deposition in kidney tissue to various degrees, and the total IHC staining pathological score of both kidneys in the high-dose group of Compound (I) was significantly decreased (*p<0.05 vs the model group). See Table 23 and
During the test, the concentration of serum anti-ds-DNA antibody of mice were detected every 4 weeks for 16 weeks.
The results showed that the symptoms of lupus erythematosus of mice in the model group were aggravated with the test time. It could be seen from the concentration of anti-ds-DNA antibody that, after 3-4 weeks of treatment, compared with the model group, the medium dose group of Compound (I) could effectively reduce the concentration level of anti-ds-DNA antibody (16 weeks, *p<0.05 vs the model group). The positive control medicament prednisone 6 mg/kg could also effectively reduce the concentration level of anti-ds-DNA antibody. See Table 24 and
At the end of the test, the serum cytokine levels of mice were detected by ELISA. The results showed that compared with the model group, low, medium and high doses, three dose groups of Compound (I) all reduced the concentration level of TNF-α, and there were significant differences between the medium/high dose groups and the model group (***p<0.001 vs the model group). Three dose groups of Compound (I) also had a certain reduction effect on IL-6 factor, and the high dose group had a significant effect on the IL-6 reduction. See Table 25 and
According to the general toxicology study in accordance with the NMPA “Good Laboratory Practice for Non-clinical Laboratory Studies” and FDA GLP specification (21CFR Part 58), and in line with the requirements of International Conference on Harmonization of Technical Requirements for Registration of Pharmaceuticals for Human Use (ICH) and the NMPA relevant guidelines, the toxicology study on Compound (I) was carried out to provide safety data support for the use of Compound (I) in clinical patients. The administration mode and the experimental results were as follows:
Compound (I) had no effect on the central nervous system, respiratory system and cardiovascular system of animals, and was expected to have no side effects on the central nervous system, respiratory system and cardiovascular system of human. The NOAEL of single administration to rats was 2000 mg/kg, the MTD of administration to Beagle dogs was 500 mg/kg/time (1000 mg/kg/day), the NOAEL of repeated administration to rats for 28 days was 10 mg/kg/time (20 mg/kg/day), and the NOAEL of repeated administration to Beagle dogs for 28 days was 3 mg/kg/time (6 mg/kg/ day). Compound (I) had no genotoxicity. The safety window assessment was shown in the table below. The effective dose for rats was 3 mg/kg/time bid. According to the exposure, Compound (I) had 1-fold safety window in Beagles and 8-13-fold safety window in SD rats. According to the dose calculation, Compound (I) had 3-fold safety windows in both Beagle dogs and SD rats. The proposed and undetermined initial ascending dose of Compound (I) in the first-in-human trial was 15 mg. Compound (I) had a 14-fold safety window for the human equivalent dose of the NOAEL dose in the Beagle dog repeated administration toxicology study relative to the human initial dose, and a 16-fold safety window for the human equivalent dose of the NOAEL dose in the SD rat repeated is administration toxicology study relative to the human initial dose. Therefore, according to the pre-clinical toxicological study data of Compound (I), the single ascending doses of phase I clinical trial to be carried out were 15 mg, 45 mg, 60 mg, 90 mg, 135 mg, 180 mg, 240 mg, 300 mg and 360 mg.
The results of phase I clinical trial showed that when the single ascending dose came up to 240 mg, there were no safety issues above Level 3.
In conclusion, Compound (I) could improve the skin lesions of the psoriasis mice and the atopic dermatitis mice, inhibit the immune organ enlargement, and reduce the level of inflammation; it could also dose-dependently improve the skin lesions of the SLE mice, alleviate the kidney injury, inhibit the immune organ enlargement, and inhibit the increase of SLE related antibodies and cytokines in serum, and has a certain safe therapeutic window, resulting in a good clinical application prospect.
The full names for the English abbreviations used in this application and the corresponding Chinese names are as follows:
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| Number | Date | Country | Kind |
|---|---|---|---|
| 202110255275.X | Mar 2021 | CN | national |
| 202110861899.6 | Jul 2021 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2022/079887 | 3/9/2022 | WO |
