Oxidant-mediated damage of Leishmania donovani promastigotes.

Abstract:

:Dissemination of Leishmania within the host is related to parasites undergoing unchecked proliferation. We therefore studied the effects of oxidant generating systems on promastigote multiplication by (i) direct determinations of organism proliferation and (ii) the incorporation of [3H]uracil into promastigote nucleoprotein. These two parameters correlated closely as measures of organism replication as demonstrated by parallel suppression of them by the protein synthesis inhibitors puromycin and cycloheximide and the nucleic acid synthesis inhibitors actinomycin D and mitomycin C. Promastigotes showed dose-related susceptibility to reagent and generated hydrogen peroxide (H2O2) as reflected in quantitatively similar decreases in multiplication and [3H]uracil incorporation. These effects were specific for H2O2 as catalase abrogated the dimunition in multiplication. The generation of superoxide anion by acetaldehyde-xanthine oxidase (10 mU/ml) did not alter promastigote replication or nucleoprotein synthesis. These results indicate that Leishmania donovani promastigotes are damaged by H2O2 and that the incorporation of [3H]uracil into promastigote nucleoprotein may be useful for studying the interaction of this parasite with host effector cells.

journal_name

Infect Immun

journal_title

Infection and immunity

authors

Reiner NE,Kazura JW

doi

10.1128/IAI.36.3.1023-1027.1982

subject

Has Abstract

pub_date

1982-06-01 00:00:00

pages

1023-7

issue

3

eissn

0019-9567

issn

1098-5522

journal_volume

36

pub_type

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