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主题:间充质干细胞通过一种白细胞介素-6依赖机制来抑制树突状细胞的分化
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e7 [5 H( n; ?' ~说明:原文来源自Stem Cells. 2007 Aug;25(8):2025-32. Epub 2007 May 17,由干细胞之家新闻小组成员deron翻译(转帖请注明)。
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翻译内容:
6 [7 f3 b* _& z( v2 }" B因潜在的组织工程学临床应用、以及拥有减少同种(异基因)移植中移植物抗宿主疾病的发病率和术后反应的能力,间充质干细胞(MSC)备受关注。我们先前的研究结果显示MSC介导的免疫抑制是通过刺激下诱导分泌可溶性的因子来发挥作用。本研究的目的在于识别其中相关的分子作用机制。我们发现鼠类MSC分泌高水平的IL-6和血管内皮生长因子,两者可直接抑制T细胞增殖。在加入一种中和性的抗IL-6抗体或者前列腺素E2抑制剂吲哚美辛后,T细胞活性部分恢复。有趣的是,我们没有检测到吲哚胺2,3-二氧化酶活性。本研究显示MSC降低了成熟树突状细胞(DC)主要组织相容性复合物Ⅱ类分子、CD40以及CD86协同刺激分子的表达,而这一情况也抑制了T细胞增殖。值得一提的是,我们观察到经来自MSC的上清培养后,由于分泌性IL-6的存在,骨髓前体向DC细胞的分化被部分抑制。总之,这些数据显示IL-6与MSC介导的免疫调节机制相关,但这种通过部分抑制DC分化的调节可能并不是主要机制。
) \8 q% K. B& J全文的步骤是按照:细胞培养——全RNA分离、cDNA杂交——基因序列分析——混合淋巴细胞反应——酶联免疫吸附检测量化细胞因子——吲哚胺2,3-二氧化酶活性测量——DC培养和与C3共培养——表型鉴定——统计学分析来进行9 y, L( Q3 [- |3 s" g8 l. h
得到的结果有几点7 H! i0 [( \" s- Q- q
1.在与脾细胞共培养后,MSC的IL-6和VEGF表达上调
& f6 F0 ^% O5 f" R. D0 I! A! e2.IL-6是MSC介导的免疫调节反应作用的一部分
; J- T/ D9 H% H8 h: |2 n% i* `3.PEG2与MSC诱导的抑制机制相关
9 \4 o) f6 Q. A" T$ O/ F+ N; J: L0 p4.C3 MSC不表达IDO 活性
) L R1 |$ J) k2 d4 }3 l5.MSC的免疫抑制作用可减少成熟DC细胞的数量3 `8 ~8 _, i( g5 R& l. @6 }# [+ W( v
# C( Z2 N/ e0 J2 h+ @原摘要:
& r# D! X: \5 H2 V9 dMesenchymal stem cells (MSC) are of particular interest for their potential clinical use in tissue engineering as well as for their capacity to reduce the incidence and severity of graft-versus-host disease in allogeneic transplantation. We have previously shown that MSC-mediated immune suppression acts via the secretion of soluble factor(s) induced upon stimulation. The aim of this study was to identify the molecule(s) involved and the underlying mechanism(s). We show that murine MSC secrete high levels of interleukin (IL)-6 and vascular endothelial growth factor, which are directly correlated to the inhibition of T-cell proliferation. The T-cell activation is partially restored upon addition of a neutralizing anti-IL-6 antibody or the prostaglandin E2 inhibitor indomethacin. Interestingly, no indoleamine 2,3-dioxygenase activity was detected in our conditions. Instead, we show that MSC reduce the expression of major histocompatibility complex class II, CD40, and CD86 costimulatory molecules on mature dendritic cells (DC), which was responsible for a decrease in T-cell proliferation. Moreover, we show that the differentiation of bone marrow progenitors into DC cultured with conditioned supernatants from MSC was partly inhibited through the secretion of IL-6. Altogether, these data suggest that IL-6 is involved in the immunoregulatory mechanism mediated by MSC through a partial inhibition of DC differentiation but is probably not the main mechanism. Disclosure of potential conflicts of interest is found at the end of this article.
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, i G, B2 f; k0 i1 J+ ^' L" K2 n原文:
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2 l' V5 g. O) D; F; ~* i5 }( M, J1 P附注:3 J% L" B( w/ e5 x! E+ K
虽然这是一篇相对较老的文章,可是信息量却很丰富,翻译过来,摘要中有两种需要详细介绍的物质! i( p! L4 C" h" @6 g2 s7 W
1.吲哚胺2,3-二氧化酶(Indoleamine2,3-dioxygenase,IDO)作用是清除局部微环境中的色氨酸,诱导T淋巴细胞的凋亡,通过调节性T细胞的作用抑制T细胞的克隆性增生,参于细胞免疫的调节
. |' j5 @# ^" l7 q& C* }# X2.前列腺素E2是抑制T细胞免疫活化的重要炎性介质之一,它通过对T细胞活化途径中的信号转导分子的抑制作用,使T细胞处于免疫失活或无能状态 |
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