Human lymphocytes stimulate prostacyclin synthesis in human umbilical vein endothelial cells. Involvement of endothelial cPLA2

Human lymphocytes stimulate prostacyclin synthesis in human umbilical vein endothelial cells. Involvement of endothelial cPLA2
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人淋巴细胞刺激人脐静脉内皮细胞合成前列环素。

DOI:
10.1189/jlb.68.6.881
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发表时间:
2000
影响因子:
5.5
通讯作者:
A. Prigent
A. Prigent
中科院分区:
医学3区
文献类型:
--
作者:
F. Merhi‐Soussi;Z. Domínguez;O. Macovschi;M. Dubois;A. Savany;M. Lagarde;A. Prigent

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前列环素(PGI2)具有抗血小板和扩张血管的作用,有助于维持血管的非粘附性管腔表面。在这里,我们试图确定外周血淋巴细胞(PBL)是否可以调节人脐静脉内皮细胞(HUVEC)产生PGI2。HUVEC与淋巴细胞之间的细胞-细胞接触明显促进PGI2的合成,这与加入的淋巴细胞数量有关。当淋巴细胞和HUVEC被微孔插入物分离时,这种刺激的合成完全被抑制。这不是由于前列腺素H合成酶上调所致。用PGI2合成酶抑制剂三羟环丙胺处理淋巴细胞,可部分抑制PGI2的合成(47%),提示淋巴细胞PGI2合成酶可跨细胞代谢内皮细胞前列腺素内源性过氧化产物PGH2。用[14C]花生四烯酸标记的淋巴细胞与未标记的HUVEC共孵育,以及[14C]花生四烯酸标记的HUVEC与未标记的淋巴细胞共同孵育的实验表明,用于合成PGI2的花生四烯酸完全来自内皮细胞。此外,胞浆磷脂酶A2抑制剂MAFP对PGI2的合成有强烈的抑制作用,而钙离子螯合剂BAPTA和EGTA联合使用则完全抑制PGI2的合成。总而言之,这些结果表明,淋巴细胞在内皮细胞中触发了一个由外向内的信号,涉及cPLA2的激活。总体而言,淋巴细胞诱导的PGI2合成的启动可能起到保护动脉粥样硬化血栓形成的作用。
Prostacyclin (PGI2) contributes to the maintenance of a nonadhesive luminal surface in blood vessels due to its anti‐platelet and vasodilatory properties. Here, we sought to determine whether peripheral blood lymphocytes (PBL) may regulate the PGI2 production of human umbilical vein endothelial cells (HUVEC). Cell‐cell contact between HUVEC and lymphocytes markedly enhanced PGI2 synthesis as a function of the number of lymphocytes added. This stimulated synthesis was totally suppressed when lymphocytes and HUVEC were separated by a microporous insert. It was not due to prostaglandin H synthase up‐regulation. The pretreatment of lymphocytes with the PGI2 synthase inhibitor tranylcypromine partially inhibited PGI2 synthesis (47%), suggesting a transcellular metabolism of the endothelial prostaglandin endoperoxide PGH2 by the lymphocyte PGI2 synthase. Experiments using [14C]arachidonate‐labeled lymphocytes coincubated with unlabeled HUVEC, and [14C]arachidonate‐labeled HUVEC coincubated with unlabeled lymphocytes showed that the arachidonic acid used for PGI2 synthesis was totally of endothelial origin. Furthermore, the PGI2 synthesis was strongly inhibited by the cytosolic phospholipase A2 inhibitor, MAFP and totally suppressed by the combination of the calcium chelators, BAPTA and EGTA. Collectively, these results suggest that lymphocytes trigger an outside‐in signaling in endothelial cells involving cPLA2 activation. Overall, the switch‐on for PGI2 synthesis induced by lymphocytes might serve as a protection against atherothrombogenesis.
Tranylcypromine 和 15-氢过氧花生四烯酸除了抑制小牛主动脉内皮细胞中的前列环素合成外,还影响花生四烯酸的释放。
DOI: --
发表时间: 1980
期刊: The Journal of biological chemistry
影响因子: --
作者:
Hong,SL;Carty,T;Deykin,D
通讯作者: Deykin,D
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DOI: --
发表时间: 1991
期刊: The Journal of biological chemistry
影响因子: --
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DOI: 10.1172/jci112995
发表时间: 1987-06
期刊: The Journal of clinical investigation
影响因子: --
作者:
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DOI: 10.1172/jci119129
发表时间: 1997-01-01
影响因子: 15.9
作者:
Newman, PJ
通讯作者: Newman, PJ