CD40 signaling in human dendritic cells is initiated within membrane rafts

CD40 signaling in human dendritic cells is initiated within membrane rafts
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人类树突状细胞中的 CD40 信号传导在膜筏内启动

DOI:
10.1093/emboj/19.13.3304
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发表时间:
2000
期刊:
The EMBO Journal
影响因子:
--
通讯作者:
S. Manié
S. Manié
中科院分区:
--
文献类型:
--
作者:
P. Vidalain;O. Azocar;C. Servet‐Delprat;C. Rabourdin;D. Gerlier;S. Manié

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尽管CD40的S在刺激树突状细胞(DC)中发挥有效的特异性T细胞刺激作用,但其在DC中的信号转导成分仍鲜有报道。我们发现人类单核细胞来源的树突状细胞上的CD40受体与富含鞘脂和胆固醇的质膜微域相关,称为膜筏。结合后,CD40利用膜RAFT相关的Lyn Src家族激酶,以及可能的其他RAFT相关的Src家族激酶,启动细胞内底物的酪氨酸磷酸化。CD40结合还导致肿瘤坏死因子受体相关因子(TRAF3)的膜RAF-3募集到CD40的S胞浆尾部,TRAF2的募集程度较小。因此,膜筏结构在树突状细胞CD40信号的近端事件中起着不可或缺的作用。我们证明,在膜筏内刺激src家族激酶启动了一条涉及ERK激活的途径,该途径导致IL-1和IL-1Raα/β的产生,并有助于p38依赖的IL-12mRNA的产生。这些结果首次证明膜筏在DC中CD40信号的启动中起关键作用,并描绘了CD40介导的信号通路对细胞因子产生的影响。
Despite CD40's role in stimulating dendritic cells (DCs) for efficient specific T‐cell stimulation, its signal transduction components in DCs are still poorly documented. We show that CD40 receptors on human monocyte‐derived DCs associate with sphingolipid‐ and cholesterol‐rich plasma membrane microdomains, termed membrane rafts. Following engagement, CD40 utilizes membrane raft‐associated Lyn Src family kinase, and possibly other raft‐associated Src family kinases, to initiate tyrosine phosphorylation of intracellular substrates. CD40 engagement also leads to a membrane raft‐restricted recruitment of tumor necrosis factor (TNF) receptor‐associated factor (TRAF) 3 and, to a lesser extent, TRAF2, to CD40's cytoplasmic tail. Thus, the membrane raft structure plays an integral role in proximal events of CD40 signaling in DCs. We demonstrate that stimulation of Src family kinase within membrane rafts initiates a pathway implicating ERK activation, which leads to interleukin (IL)‐1α/β and IL‐1Ra mRNA production and contributes to p38‐dependent IL‐12 mRNA production. These results provide the first evidence that membrane rafts play a critical role in initiation of CD40 signaling in DCs, and delineate the outcome of CD40‐mediated pathways on cytokine production.
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