Mesenchymal Stromal Cells Rapidly Suppress TCR Signaling-Mediated Cytokine Transcription in Activated T Cells Through the ICAM-1/CD43 Interaction.

Mesenchymal Stromal Cells Rapidly Suppress TCR Signaling-Mediated Cytokine Transcription in Activated T Cells Through the ICAM-1/CD43 Interaction.
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间充质基质细胞通过 ICAM-1/CD43 相互作用快速抑制活化 T 细胞中 TCR 信号介导的细胞因子转录。

DOI:
10.3389/fimmu.2021.609544
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发表时间:
2021
影响因子:
7.3
通讯作者:
Xiang AP
Xiang AP
中科院分区:
医学2区
文献类型:
--
作者:
Zheng S;Huang K;Xia W;Shi J;Liu Q;Zhang X;Li G;Chen J;Wang T;Chen X;Xiang AP

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细胞与细胞的接触参与间充质基质细胞(MSC)介导的T细胞调节过程,从而有助于基于MSC的多种炎症性疾病(尤其是T细胞介导的疾病)的治疗。然而,间充质干细胞和T细胞之间粘附相互作用的机制仍然知之甚少。在本研究中,我们探讨了MSCs和T细胞之间的相互作用,发现活化的T细胞可以快速粘附到MSCs上,导致TNF-α和IFN-γ mRNA表达显着减少。此外,在 MSC 共培养中,活化 T 细胞中的 TCR 近端信号传导也受到显着抑制,导致 Ca2+ 信号传导减弱。 MSC 以细胞-细胞接触依赖性方式快速抑制 TCR 信号传导及其下游信号传导,部分是通过 ICAM-1/CD43 粘附相互作用。阻断 MSC 上的 ICAM-1 或 T 细胞上的 CD43 可以显着逆转 T 细胞中促炎细胞因子表达的快速抑制。从机制上讲,MSC 衍生的 ICAM-1 可能会破坏 CD43 介导的 TCR 微簇形成,从而限制 T 细胞激活。综上所述,我们的结果揭示了 MSC 抑制活化 T 细胞的快速机制,这为揭示 MSC 介导的 aGVHD 和其他严重急性 T 细胞相关疾病的免疫调节机制提供了新线索。
Cell-cell contact participates in the process of mesenchymal stromal cell (MSC)-mediated T cell modulation and thus contributes to MSC-based therapies for various inflammatory diseases, especially T cell-mediated diseases. However, the mechanisms underlying the adhesion interactions between MSCs and T cells are still poorly understood. In this study, we explored the interaction between MSCs and T cells and found that activated T cells could rapidly adhere to MSCs, leading to significant reduction of TNF-α and IFN-γ mRNA expression. Furthermore, TCR-proximal signaling in activated T cells was also dramatically suppressed in the MSC co-culture, resulting in weakened Ca2+ signaling. MSCs rapidly suppressed TCR signaling and its downstream signaling in a cell-cell contact-dependent manner, partially through the ICAM-1/CD43 adhesion interaction. Blockade of either ICAM-1 on MSCs or CD43 on T cells significantly reversed this rapid suppression of proinflammatory cytokine expression in T cells. Mechanistically, MSC-derived ICAM-1 likely disrupts CD43-mediated TCR microcluster formation to limit T cell activation. Taken together, our results reveal a fast mechanism of activated T cell inhibition by MSCs, which provides new clues to unravel the MSC-mediated immunoregulatory mechanism for aGVHD and other severe acute T cell-related diseases.
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