Thrombin receptor activation inhibits monocyte spreading by induction of ET(B) receptor-coupled nitric oxide release.

Thrombin receptor activation inhibits monocyte spreading by induction of ET(B) receptor-coupled nitric oxide release.
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凝血酶受体激活通过诱导 ET(B) 受体偶联一氧化氮释放来抑制单核细胞扩散。

DOI:
10.4049/jimmunol.161.9.5039
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发表时间:
1998
影响因子:
4.4
通讯作者:
H. Magazine
H. Magazine
中科院分区:
医学2区
文献类型:
--
作者:
K. D. Srivastava;H. Magazine

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The effect of thrombin receptor activation on monocyte conformation was evaluated using the human monocyte cell line, THP-1, and the thrombin mimetic peptide, Trap-14. Treatment of THP-1 cells with Trap-14 induced rapid rounding of ameboid cells adherent to fibronectin-coated slides, whereas cell rounding was abrogated in the presence of the nitric oxide synthase inhibitor, NG-nitro-L-arginine or the endothelin B receptor antagonist, BQ-788. Endothelin-1 (ET-1) levels in the culture supernatant increased markedly within minutes of Trap-14 exposure with a concomitant loss in cellular ET-1 immunoreactivity. Importantly, loss of ET-1 immunoreactivity was blocked by pretreatment with the vesicle translocation inhibitor, nocodazole. Trap-14 potently induced the release of NO from THP-1 cells, whereas NO release was ablated by preincubation with BQ-788. These data demonstrate that thrombin receptor activation may inhibit cellular spreading as a result of autocrine ET-1 release and subsequent endothelin B receptor-dependent NO production, and suggest that initial exposure of inflammatory cells to thrombin may limit cellular activation and recruitment.
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