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• W2000557046 abstract "The mechanism by which promastigotes of Leismania donovani enter hamster peritoneal macrophages was studied in vitro by light and electron microscopy. Quantitative light microscope studies showed a time-dependent increase of intracellular parasites, which had no preferable orientation during entry. Scanning and transmission electron microscopy revealed striking host-parasite surface interactions marked by the formation of whorled pseudopodia around the promastigotes in the early stage and engulfment of the parasites akin to normal phagocytosis in the later phase. Early host-parasite interactions were categorized quantitatively by scanning electron microscopy into several types, of which “head-first entry” and “tail-first entry” were approximately equal in frequency of occurrence, confirming light microscope observations. Cytochalasin B at 10 μg/ml prevented the intracellular entry of the parasites and the formation of macrophage-originated pseudopodia normally seen to seize the promastigotes. Killed, but morphologically intact, promastigotes were poorly taken up by macrophages and lacked certain types of interactions normally encountered with macrophage pseudopodia. Motility of promastigotes and their affinity to the surface of macrophages are suggested as elements of importance which parasites contribute to aid the process of their entry. The above results indicate that promastigotes of L. donovani depend on phagocytic activity of macrophages to gain intracellular entrance, but parasite-specific activities and/or properties may also play a role. It is suggested that “facilitated phagocytosis” may be used to describe this unique type of endocytosis associated with leishmania-macrophage interactions." @default.
• W2000557046 created "2016-06-24" @default.
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• W2000557046 date "1979-10-01" @default.
• W2000557046 modified "2023-09-25" @default.
• W2000557046 title "Leishmania donovani: Promastigote-macrophage surface interactions in vitro" @default.
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• W2000557046 doi "https://doi.org/10.1016/0014-4894(79)90097-3" @default.
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