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首页> 外文期刊>Parasitology >Phospholipase A1 from Trypanosoma cruzi infective stages generates lipid messengers that activate host cell protein kinase c.
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Phospholipase A1 from Trypanosoma cruzi infective stages generates lipid messengers that activate host cell protein kinase c.

机译:来自克鲁氏锥虫感染阶段的磷脂酶A1产生脂质信使,从而激活宿主细胞蛋白激酶c。

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摘要

Here we have studied phospholipase A1 (Plase A1) from Trypanosoma cruzi infective stages and it's possible role regarding the interaction with mammalian host cells. Plase A1 was mainly detected as a membrane-bound activity in the infective amastigote and trypomastigote stages, being remarkably higher with respect to the non-infective epimastigotes. It is noteworthy that only the infective stages secreted Plase A1. Moreover, along the differentiation process from epimastigotes into metacyclic trypomastigotes, the secreted enzyme activity increased simultaneously with the appearance of metacyclic forms, as expected. Since this enzyme is predominantly membrane-associated and secreted by the infective stages, Vero cell lipid profile modifications were analysed after interaction with either intact infective parasites or purified T. cruzi Plase A1. Significant changes in Vero cell lipid composition were observed, with the appearance of free fatty acids, diacylglycerol and lysophosphatidylcholine. Concomitantly with the generation of second lipid messengers, host cell protein kinase C activation was demonstrated. These results indicate that T. cruzi Plase A1 could play a critical role in the early events of parasite-host cell interaction that precede invasion.
机译:在这里,我们研究了克鲁氏锥虫感染阶段的磷脂酶A1(Plase A1),它在与哺乳动物宿主细胞相互作用中可能发挥作用。血浆A1主要被检测为在感染性鞭毛象结节和锥虫弓形虫阶段的膜结合活性,相对于非感染性表象鞭毛结节来说明显更高。值得注意的是,只有感染阶段分泌了Plase A1。此外,正如预期的那样,沿着从表鞭毛体向中间环类锥柄体的分化过程,分泌的酶活性与中间环形式同时出现。由于该酶主要是与膜相关并由感染阶段分泌,因此在与完整的感染性寄生虫或纯化的克鲁氏疟原虫A1相互作用后,分析了Vero细胞脂质谱的修饰。观察到Vero细胞脂质组成发生了显着变化,并出现了游离脂肪酸,二酰基甘油和溶血磷脂酰胆碱。伴随第二脂质信使的产生,证明了宿主细胞蛋白激酶C的活化。这些结果表明克鲁维氏锥虫A1可能在入侵之前的寄生虫-宿主细胞相互作用的早期事件中发挥关键作用。

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