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APOPTOSIS OF T CELLS MEDIATED BY GALECTIN-1

机译:Galectin-1介导的T细胞凋亡

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GALECTIN-1, a member of the family of beta-galactoside binding proteins(1), has growth regulatory and immunomodulatory activities(2-4). We report here that galectin-1, expressed by stromal cells in human thymus and lymph nodes(5,6), is present at sites of cell death by apoptosis during normal T-cell development and maturation, Galectin-1 induced apoptosis of activated human T cells and human T leukaemia cell lines. Resting T cells also bound galectin-1, but did not undergo apoptosis. Human endothelial cells that expressed galectin-1 induced apoptosis of bound T cells. Galectin-1-induced apoptosis required expression of CD45, and was decreased when N-glycan elongation was blocked by treatment of the cells by swainsonine(7), whereas inhibition of O-glycan elongation(8) potentiated the apoptotic effect of galectin-1. Induction of apoptosis by an endogenous mammalian lectin represents a new mechanism for regulating the immune response.
机译:GALECTIN-1是β-半乳糖苷结合蛋白家族的成员(1),具有生长调节和免疫调节活性(2-4)。我们在这里报告说,在正常的T细胞发育和成熟过程中,通过细胞凋亡在细胞死亡的部位存在由人类胸腺和淋巴结中的基质细胞表达的galectin-1,Galectin-1诱导了活化人的凋亡T细胞和人T白血病细胞系。静止的T细胞也结合galectin-1,但未发生凋亡。表达galectin-1的人内皮细胞诱导结合的T细胞凋亡。 Galectin-1诱导的细胞凋亡需要CD45的表达,而当Swainsonine处理细胞阻断N-聚糖延伸时,其表达会降低(7),而抑制O-聚糖延伸(8)则增强了Galectin-1的凋亡作用。 。内源性哺乳动物凝集素诱导细胞凋亡代表了调节免疫反应的新机制。

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