A critical role for protein kinase C-theta-mediated T cell survival in cardiac allograft rejection.

A critical role for protein kinase C-theta-mediated T cell survival in cardiac allograft rejection.
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DOI:
10.4049/jimmunol.181.1.513
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发表时间:
2008-07-01
影响因子:
4.4
通讯作者:
Sun, Zuoming
Sun, Zuoming
中科院分区:
医学2区
文献类型:
--
作者:
Manicassamy, Santhakumar;Yin, Dengping;Zhang, Zheng;Molinero, Luciana L.;Alegre, Marisa-Luisa;Sun, Zuoming

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蛋白激酶 C (PKC)-θ 介导 T 细胞激活所需的关键 TCR 信号。此前,我们已经证明,响应 TCR 刺激,PKC-θ−/− T 细胞会因抗凋亡分子 Bcl-xL 水平大大降低而发生凋亡。在这项研究中,我们证明 PKC-θ 调节的 Bcl-xL 表达对于 T 细胞介导的心脏同种异体移植排斥至关重要。用野生型T细胞重建的Rag1−/−小鼠很容易排斥完全不匹配的同种异体心脏移植物,而用PKC-θ−/− T细胞重建的Rag1−/−小鼠未能促进排斥。 PKC-θ -/− T 细胞中 Bcl-xL 的转基因表达足以恢复心脏同种异体移植排斥反应,表明在此过继转移模型中,T 细胞介导的心脏同种异体移植排斥反应需要 PKC-θ 调节的存活。与过继转移实验相反,完整的 PKC-θ −/− 小鼠表现出延迟但成功的心脏同种异体移植排斥反应,表明 PKC-θ 功能的潜在补偿。最后,亚治疗剂量的抗 CD154 Ab 或 CTLA4-Ig 不足以预防野生型小鼠的心脏同种异体移植排斥,但可以预防 PKC-θ −/− 小鼠的心脏排斥。因此,与其他治疗相结合,抑制 PKC-θ 可能有助于实现同种异体移植物的长期存活。
Protein kinase C (PKC)-θ mediates the critical TCR signals required for T cell activation. Previously, we have shown that in response to TCR stimulation, PKC-θ−/− T cells undergo apoptosis due to greatly reduced levels of the anti-apoptotic molecule, Bcl-xL. In this study, we demonstrate that PKC-θ-regulated expression of Bcl-xL is essential for T cell-mediated cardiac allograft rejection. Rag1−/− mice reconstituted with wild-type T cells readily rejected fully mismatched cardiac allografts, whereas Rag1−/− mice reconstituted with PKC-θ −/− T cells failed to promote rejection. Transgenic expression of Bcl-xL in PKC-θ −/− T cells was sufficient to restore cardiac allograft rejection, suggesting that PKC-θ-regulated survival is required for T cell-mediated cardiac allograft rejection in this adoptive transfer model. In contrast to adoptive transfer experiments, intact PKC-θ −/− mice displayed delayed, but successful cardiac allograft rejection, suggesting the potential compensation for PKC-θ function. Finally, a subtherapeutic dose of anti-CD154 Ab or CTLA4-Ig, which was not sufficient to prevent cardiac allograft rejection in the wild-type mice, prevented heart rejection in the PKC-θ −/− mice. Thus, in combination with other treatments, inhibition of PKC-θ may facilitate achieving long-term survival of allografts.
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