Latency associated peptide has in vitro and in vivo immune effects independent of TGF-beta1.

Latency associated peptide has in vitro and in vivo immune effects independent of TGF-beta1.
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潜伏期相关的肽具有与TGF-BETA1无关的体外和体内免疫作用。

DOI:
10.1371/journal.pone.0001914
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发表时间:
2008-04-02
期刊:
影响因子:
3.7
通讯作者:
Marsh CB
Marsh CB
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ali NA;Gaughan AA;Orosz CG;Baran CP;McMaken S;Wang Y;Eubank TD;Hunter M;Lichtenberger FJ;Flavahan NA;Lawler J;Marsh CB

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潜伏相关肽(Latency Associated Peptide,缩写LTP)与TGF-β1结合,形成潜伏复合物。目前,推测TGF-β 1仅作为活性TGF-β1的螯合剂发挥作用。以往的研究表明,顺铂可以诱导上皮细胞迁移,但对白细胞的影响还没有报道。由于TGF-β1在多种免疫过程中发挥作用,我们假设TGF-β1可以独立调节免疫应答。在单独的实验中,我们发现,在迟发型超敏反应(DTHR)的小鼠模型中,在体内,ESTA促进人类单核细胞的趋化性和阻断炎症。这些作用不涉及TGF-β1活性。进一步的研究表明,特异性LAP-血小板反应蛋白-1(TSP-1)相互作用的破坏阻止了LAP诱导的反应。雷公藤多甙对DTH的抑制作用依赖于IL-10。这些数据支持一个新的作用,调节单核细胞运输和免疫调节。
Latency Associated Peptide (LAP) binds TGF-β1, forming a latent complex. Currently, LAP is presumed to function only as a sequestering agent for active TGF-β1. Previous work shows that LAP can induce epithelial cell migration, but effects on leukocytes have not been reported. Because of the multiplicity of immunologic processes in which TGF-β1 plays a role, we hypothesized that LAP could function independently to modulate immune responses. In separate experiments we found that LAP promoted chemotaxis of human monocytes and blocked inflammation in vivo in a murine model of the delayed-type hypersensitivity response (DTHR). These effects did not involve TGF-β1 activity. Further studies revealed that disruption of specific LAP-thrombospondin-1 (TSP-1) interactions prevented LAP-induced responses. The effect of LAP on DTH inhibition depended on IL-10. These data support a novel role for LAP in regulating monocyte trafficking and immune modulation.
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