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上海士鋒生物關于金屬蛋白酶組織抑制因子3又有新效用
點擊次數:818 發布時間:2013-6-22
Th1、Th2細胞是Th前體細胞 (pTh )在特定抗原刺激及多種因素綜合作用下,發生功能性極化的結果。越來越多的證據表明,Th1/Th2極化是免疫應答調節中的關鍵環節。已有的研究表明,細胞因子、抗原、抗原遞呈細胞(APC )、共刺激信號及一些基因調控因子均為Th1/Th2極化提供了重要信號。
金屬蛋白酶組織抑制因子3(TIMP-3)是能夠抑制基質金屬蛋白酶的蛋白家族中的一種,已經發現它能夠作為一種炎癥檢查的介質。
總所周知,炎癥引起了免疫反應的激活,然而,TIMP-3是否也作用于免疫系統目前還不明確。在該研究中,研究人員發現了TIMP-3新的功能:通過影響抗原呈遞細胞,影響了Th1/Th2的極化。
首先,在人樹突細胞通過p38MAPK通路發生分化的時候,TIMP-3被發現通過IL-4而顯著上調。其次,共刺激分子CD86的表達能夠被TIMP-3所抑制。而且,在樹突細胞中,IL-12的誘導以PI3K依賴的方式被顯著的抑制。
此外,在TIMP-3存在下,樹突細胞的成熟能夠刺激同種異體初始T輔助(Th)細胞表現出顯著的Th2極化。重要的是,在自體免疫疾病原發免疫性血小板減少癥患者的血液樣品里,研究發現TIMP-3與IL-4及血小板數目表現出正相關關系,但是與IFN-γ卻表現出一個負相關關系。
總的來說,該研究闡明了人體內TIMP-3對Th1/Th2極化的新功能。
Regulation of Th1/Th2 polarization by tissue inhibitor of metalloproteinase-3 via modulating dendritic cells
Tissue inhibitor of metalloproteinase-3 (TIMP-3) is one of a family of proteins inhibiting matrix metalloproteinases, which has also been identified as a mediator for checking inflammation.Meanwhile, it is well known that inflammation causes the activation of the immune response. However, it is not clear whether TIMP-3 plays a role in the immune system.In the present study, we demonstrated a novel function of TIMP-3 in Th1/Th2 polarization through its influence on the antigen-presenting cells. First, TIMP-3 was found strikingly up-regulated by IL-4 during the differentiation of human dendritic cells via the p38MAPK pathway.Second, the expression of costimulatory molecule-CD86 was repressed by TIMP-3. Besides, the induction of IL-12 in matured dendritic cells was significantly inhibited in a PI3K-dependent manner.Furthermore, dendritic cells matured in the presence of TIMP-3 could stimulate allogeneic naive T helper (Th) cells to display a prominent Th2 polarization. Importantly, in an autoimmune disorder–primary immune thrombocytopenia, TIMP-3 showed a statistically positive correlation with IL-4 and plaet count, but a negative correlation with IFN-γ in patient blood samples. Collectively, these in vitro and in vivo data clearly suggested a novel role of TIMP-3 in Th1/Th2 balance in humans.