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The endocrine system to maintain calcium homeostasis involves the active vitamin D, as well as parathyloid hormone (PTH). Based on this 'classical' calcium-regulatory function, 1,25-(OH)2D3 and 1 alpha OHD3 was developed as the drug for vitamin D resistant rickets, renal dystrophy, and osteoporosis. Psoriasis is a chronic skin disease which is characterized by hyperproliferation and abnormal differentiation of epidermis. As an anti-psoriatic drug, 1,24R-(OH)2D3 has been on clinical use. The efficacy for psoriasis is explainable by the differentiation-inducing activity of this compound. 1,25-(OH)2D3 was also reported to suppress proliferation and induce differentiation of tumor cells including breast cancer, colon cancer and so forth, suggesting the possible therapy of malignant tumors. In immune system, active vitamin D3 exerts various effects; 1,25-(OH)2D3 suppresses proliferation and cytokine production in T cells and antibody production in B cells. Animal models of autoimmune diseases and skin-graft suggest active vitamin D becomes a novel immuno suppressant. Since 1,25-(OH)2D3 induces the synthesis of nerve growth factor (NGF), it will be a new therapy for the treatment of neuronal degenerative diseases.
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This anti-inflammatory agent proved to have a therapeutic margin wider than that of indomethacin. Y-8004 exhibited little effect on the central nervous system, somatic and autonomic nervous system. On the cardiovascular system in dogs, Y-8004 induced a slight transient fall in blood pressure followed by a pressor response, increase in heart rate and coronary vasodilation at a dose of 30 mg/kg given intravenously, but no remarkable change was seen on the electrocardiogram. Y-8004 showed no effect on isolated smooth muscles such as vas deferens, ileum and atria, but inhibited gastrointestinal propulsion at a dose of 100 mg/kg given orally in mice and spontaneous contractions of the pregnant uterus of rats at a concentration of more than 10(-6)M. This agent also decreased urine volume and electrolytes in rats. This property was considered to be common to other acidic nonsteroidal anti-inflammatory agents. On the other hand, in guinea pigs, Y-8004 inhibited the bradykinin-induced bronchoconstriction and the collagen-induced platelet aggregation to a greater extent than did indomethacin. These findings suggest that Y-8004 is an active compound with properties similar to acidic non-steroidal anti-inflammatory agents such as indomethacin.