Endothelial prostaglandin secretion: effects of typhus rickettsiae.

Endothelial prostaglandin secretion: effects of typhus rickettsiae.
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内皮前列腺素分泌:斑疹伤寒立克次体的影响。

DOI:
10.1093/infdis/162.5.1136
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发表时间:
1990
期刊:
The Journal of infectious diseases
影响因子:
--
通讯作者:
Morgan,DA
Morgan,DA
中科院分区:
--
文献类型:
--
作者:
Walker,TS;Brown,JS;Hoover,CS;Morgan,DA

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将培养的人脐静脉来源的内皮细胞与斑疹伤寒立克次体一起孵育,并检查上清液中前列腺素 I2 (pGI2) 和 E2 (PGE2) 的存在。与代谢活跃的立克次体一起孵育的细胞比单独与缓冲液或与灭活的立克次体一起孵育的细胞分泌显着更多的PGI 2 和PGE 2 。 PGI2 的分泌量与存在的溶血活性立克次体的数量直接相关。消除立克次体溶血活性也就消除了它们对 PGI2 分泌的影响。注射致死剂量的本地斑疹伤寒立克次体的小鼠表现出循环 PGI2 水平迅速升高;给予溶血性灭活立克次体的小鼠存活下来,且血浆 PGI2 水平没有升高。最后,用立克次体感染内皮细胞,并在立克次体增殖过程中监测前列腺素的分泌;立克次体在细胞内的积累导致内皮细胞破坏以及内皮细胞PGI2和PGE2分泌的急剧增加。因此,斑疹伤寒立克次体可以增加内皮分泌花生四烯酸衍生的类毒素。
Cultured human umbilical vein-derived endothelial cells were incubated with typhus rickettsiae, and supernatants were examined for the presence of prostaglandins I2(pGI2) and E2(PGE2). Cells incubated with metabolically active rickettsiae secreted significantly more PGI2and PGE2than did those incubated with buffer alone or with killed rickettsiae. The amount of PGI2secreted was directly related to the number of hemolytically active rickettsiae present; abolishing rickettsial hemolytic activity abolished their effect on PGI2secretion. Mice injected with a lethal dose of native typhus rickettsiae exhibited a rapid rise in circulating PGI2levels; mice given hemolytically inactive rickettsiae survived and exhibited no rise in plasma PGI2levels. Finally, endothelial cells were infected with rickettsiae, and secretion of prostaglandins was monitored during rickettsial multiplication; intracellular accumulation of rickettsiae resulted in endothelial destruction and a dramatic increase in endothelial secretion of PGI2and PGE2. Therefore, typhus rickettsiae can increase endothelial secretion of arachidonate-derived autocoids.
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