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主题:间充质干细胞介导免疫抑制作用机制的物种间差异6 K8 Q8 B. \5 F5 l7 Q# }
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说明:原文来自Stem Cell,干细胞之家新闻小组成员deron翻译(转帖请注明)
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骨髓来源间充质干细胞(MSCs)因其免疫调节特性在治疗免疫紊乱方面具有广阔前景,但是其作用机制尚有争议。正如我们在这里介绍的一样,MSC介导的免疫抑制机制在不同物种中呈现多样化。人或猴子来源的MSCs免疫抑制通过吲哚胺2,3加双氧酶(IDO)介导,但是在相同培养条件下,鼠类MSCs利用一氧化氮(介导免疫抑制作用)。当用相应的炎性因子分别刺激人和鼠MSCs以检测其IDO和诱导性一氧化氮合酶(iNOS)的表达时,我们发现人MSCs表达非常高水平的IDO和非常低水平的iNOS,但是鼠MSCs表达丰富的INOS和非常少的IDO。正如鼠MSCs一样,人MSCs的免疫抑制特性并非其固有属性,而是由炎性因子诱导并具趋化因子依赖性。这些发现为MSCs的免疫抑制及其更好应用于免疫紊乱的治疗提供了重要的参考价值。" j% M% B6 r: x
原摘要:Bone marrow-derived mesenchymal stem cells (MSCs) hold great promise for treating immune disorders because of their immunoregulatory capacity, but the mechanism remains controversial. As we show here, the mechanism of MSC-mediated immunosuppression varies among different species. Immunosuppression by human- or monkey-derived MSCs is mediated by indoleamine 2,3-dioxygenase (IDO), whereas mouse MSCs utilize nitric oxide, under the same culture conditions. When the expression of IDO and inducible nitric oxide synthase (iNOS) were examined in human and mouse MSCs after stimulation with their respective inflammatory cytokines, we found that human MSCs expressed extremely high levels of IDO, and very low levels of iNOS, whereas mouse MSCs expressed abundant iNOS and very little IDO. Immunosuppression by human MSCs was not intrinsic, but was induced by inflammatory cytokines and was chemokine-dependent, as it is in mouse. These findings provide critical information about the immunosuppression of MSCs and for better application of MSCs in treating immune disorders.4 O4 v3 k: p8 Q
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