Lodge Robert, Descoteaux Albert
INRS-Institut Armand-Frappier, Université du Québec, 531 boul. des Prairies, Laval QC, Canada H7V 1B7.
Clin Immunol. 2005 Mar;114(3):256-65. doi: 10.1016/j.clim.2004.07.018.
Promastigotes of the protozoan parasite Leishmania are inoculated into the mammalian host by an infected sandfly and are phagocytosed by macrophages. There, they differentiate into amastigotes, which replicate in phagolysosomes. A family of glycoconjugates, the phosphoglycans (PGs), plays an important role in the ability of promastigotes to survive the potentially microbicidal consequences of phagocytosis. Lipophosphoglycan (LPG), an abundant promastigote surface glycolipid, has received considerable attention over the past several years. Of interest for this review, lipophosphoglycan confers upon Leishmania donovani promastigotes the ability to inhibit phagolysosome biogenesis. This inhibition correlates with an accumulation of periphagosomal F-actin, which may potentially form a physical barrier that prevents L. donovani promastigote-harboring phagosomes from interacting with late endosomes and lysosomes. Thus, similar to several other pathogens, Leishmania promastigotes hijack the host cell's cytoskeleton early during the infection process. Here, we review this phenomenon and discuss the potential underlying mechanisms.
原生动物寄生虫利什曼原虫的前鞭毛体由受感染的白蛉接种到哺乳动物宿主中,并被巨噬细胞吞噬。在那里,它们分化为无鞭毛体,在吞噬溶酶体中复制。一类糖缀合物,即磷酸聚糖(PGs),在利什曼原虫前鞭毛体抵御吞噬作用可能产生的杀菌后果的生存能力中起着重要作用。脂磷壁酸聚糖(LPG)是一种丰富的前鞭毛体表面糖脂,在过去几年中受到了相当多的关注。在本综述中,值得关注的是,脂磷壁酸聚糖赋予杜氏利什曼原虫前鞭毛体抑制吞噬溶酶体生物发生的能力。这种抑制作用与吞噬体周围F-肌动蛋白的积累相关,这可能潜在地形成一个物理屏障,阻止含有杜氏利什曼原虫前鞭毛体的吞噬体与晚期内体和溶酶体相互作用。因此,与其他几种病原体类似,利什曼原虫前鞭毛体在感染过程早期劫持宿主细胞的细胞骨架。在此,我们综述这一现象并讨论潜在的机制。
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