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Icaritin inhibits T cell activation and prolongs skin allograft survival in mice

机译:伊卡肽抑制小鼠的T细胞活化并延长同种异体皮肤的存活

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Icaritin is a native compound from Epimedium Genus, a traditional Chinese herbal medicine which is effective in treating asthma, autoimmune diseases and viral infections. In the present paper, the immunosuppressive effects of icaritin were found through in vitro and in vivo studies. Icaritin could dose-dependently inhibit murine CD4 + T cells proliferation stimulated with mitogens or specific antigen ovabumin (OVA). Icaritin at 0.25-25 μM could down-regulate T cell activation marker CD25 expression and inhibit IL-2 production. It could also reduce the Th1 cytokine IFN-γ production significantly if the T cells were activated by ConA or anti-CD3; while the inhibition of IL-4 secretion was only seen on anti-CD3 activated T cells treated with low concentrations of icaritin. In vivo study showed that treatment of icaritin at 10 mg/kg/day on mice could suppress the immune response with prolonged allograft skin survival. Further study demonstrated that it reduced the alloantigen-induced splenocytes proliferation and Th1/Th2 cytokines. It could also increase NF-AT luciferase activity in Jurkat-NF-AT-luc T cells. The above results suggested that icaritin might be used to treat Th1 dominated immune diseases by interfering T cells activation with mechanism different to CsA.
机译:伊卡肽是来自淫羊Epi属的天然化合物,淫羊Gen属是一种中草药,可有效治疗哮喘,自身免疫性疾病和病毒感染。在本文中,通过体外和体内研究发现了icaritin的免疫抑制作用。伊立肽可以剂量依赖性地抑制有丝分裂原或特异性抗原卵清蛋白(OVA)刺激的鼠CD4 + T细胞增殖。 0.25-25μM的伊立肽可以下调T细胞活化标记CD25的表达并抑制IL-2的产生。如果T细胞被ConA或抗CD3激活,它也可以显着降低Th1细胞因子IFN-γ的产生。而IL-4分泌的抑制作用仅在用低浓度依卡替丁处理的抗CD3活化T细胞上可见。体内研究表明,在小鼠上以10 mg / kg / day的艾卡ritin处理可以抑制免疫反应,延长同种异体移植皮肤的存活时间。进一步的研究表明,它减少了同种异体抗原诱导的脾细胞增殖和Th1 / Th2细胞因子。它还可以增加Jurkat-NF-AT-luc T细胞中的NF-AT荧光素酶活性。以上结果表明,icaritin可能通过以不同于CsA的机制干扰T细胞活化来治疗Th1为主的免疫疾病。

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