Human Semaphorin-4A drives Th2 responses by binding to receptor ILT-4.

Human Semaphorin-4A drives Th2 responses by binding to receptor ILT-4.
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DOI:
10.1038/s41467-018-03128-9
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发表时间:
2018-02-21
影响因子:
16.6
通讯作者:
Chen L
Chen L
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Lu N;Li Y;Zhang Z;Xing J;Sun Y;Yao S;Chen L

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在小鼠中,信号蛋白4a (Sema4A)参与T细胞的共刺激,并通过结合受体T细胞免疫球蛋白和粘蛋白结构域蛋白2 (Tim-2)驱动Th1免疫反应。在这里,我们发现Sema4A优先在抗原呈递细胞上表达,并共同刺激CD4+ t细胞增殖并驱动Th2反应,而不是小鼠。通过采用两种独立的克隆策略,我们证明了免疫球蛋白样转录物4 (ILT-4)是活化CD4+ T细胞上人类SEMA4A (hSEMA4A)的受体。我们还发现hSEMA4A在人哮喘肺组织中高表达,暗示其在疾病发病机制中的潜在功能。我们的研究定义了hSEMA4A与小鼠同源物不同的生物学功能,通过与il -4受体结合,共同刺激CD4+T细胞并调节Th2细胞分化。信号蛋白4a是一种已知在神经发育和免疫调节中具有功能的细胞表面蛋白,但其免疫调节机制尚不清楚。在这里,作者表明,先前在髓细胞上发现的il -4是激活人CD4 T细胞介导T细胞共刺激的Semaphorin-4A的受体。
Semaphorin-4A (Sema4A) has been implicated in the co-stimulation of T cells and drives Th1 immune responses by binding to the receptor T-cell immunoglobulin and mucin domain protein 2 (Tim-2) in mice. Here we show that human, but not murine, Sema4A is preferentially expressed on antigen-presenting cells, and co-stimulates CD4+ T-cell proliferation and drives Th2 responses. By employing two independent cloning strategies, we demonstrate that Immunoglobulin-like transcript 4 (ILT-4) is a receptor for human SEMA4A (hSEMA4A) on activated CD4+ T cells. We also find hSEMA4A to be highly expressed in human asthmatic lung tissue, implying its potential function in disease pathogenesis. Our study defines a different biological function of hSEMA4A from its murine homolog through its binding to the receptor of ILT-4 to co-stimulate CD4+T cells and regulate Th2 cells differentiation. Semaphorin-4A is a cell surface protein with known functions in neural development and immune regulation, but the mechanism for immune modulation is unclear. Here the authors show that ILT-4, previously found on myeloid cells, is the receptor of Semaphorin-4A on activate human CD4 T cells for mediating T cell co-stimulation.
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