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. 1996 Oct;64(10):3975–3982. doi: 10.1128/iai.64.10.3975-3982.1996

Cytolytic activity in the genus Leishmania: involvement of a putative pore-forming protein.

F S Noronha 1, F J Ramalho-Pinto 1, M F Horta 1
PMCID: PMC174325  PMID: 8926057

Abstract

We describe here that parasites of the genus Leishmania contain a cytolytic activity which acts optimally at pH 5.0 to 5.5 and at 37 degrees C in vitro. or the four species examined, Leishmania (Leishmania) amazonensis and Leishmania (Leishmania) major presented considerable hemolytic activity, whereas Leishmania (Viannia) panamensis and Leishmania (Viannia) guyanensis showed little and no hemolytic activity, respectively. The cytolytic factor of L. amazonensis promastigotes was characterized as a protein with no protease-, phospholipase-, or detergent-like activity, probably localized inside membranous vesicles. The use of osmotic protectants revealed the colloid-osmotic nature of hemolysis, which is indicative of pore formation in the membranes of target cells. This putative pore-forming protein also damaged nucleated cells, including macrophages, causing an increase in their membrane permeability with leakage of cytoplasmic proteins. Both promastigotes and amastigotes express this lytic activity, suggesting that the cytolysin may have a function in both stages of this parasite. The pH and temperature required for optimal activity indicate that it might be more effective within the mammalian host, particularly inside the macrophage parasitophorous vacuole. In promastigotes of L. amazonensis, the expression of lytic activity seems to be regulated during their growth in vitro, being maximal at the early stationary phase.

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Selected References

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