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• W2050892758 startingPage "109" @default.
• W2050892758 abstract "Leishmania is an obligate intracellular protozoan parasite that infects cells of the reticulo-endothelial system. Host defences against Leishmania include fever and oxidant production, and the parasite has developed a number of defence mechanisms to neutralize the host response. The Leishmania donovani A2 family of proteins has been shown to be essential for survival in mammalian visceral organs. Here we provide evidence that A2 proteins protect the parasite against host defences, namely heat stress (fever) and oxidative stress. A2 is however unable to protect the cells from endoplasmic reticulum stress induced by dithiothreitol. To downregulate A2 protein expression, L. donovani was transfected with an A2 antisense RNA expressing-vector, resulting in significant reduction of A2 levels. The resulting A2-deficient cells were more sensitive to heat shock and this was associated with increased production of internal oxidants during heat shock. Moreover, axenic amastigotes with downregulated A2 expression had increased internal oxidants and decreased viability following treatment with hydrogen peroxide or a nitric oxide donor when compared to control cells. Overall, these results suggest that A2 protects L. donovani from a variety of stresses, thereby allowing it to survive in the internal organs of the mammalian host and to cause visceral disease." @default.
• W2050892758 created "2016-06-24" @default.
• W2050892758 creator A5065905534 @default.
• W2050892758 creator A5089387183 @default.
• W2050892758 date "2012-10-01" @default.
• W2050892758 modified "2023-09-23" @default.
• W2050892758 title "Involvement of the Leishmania donovani virulence factor A2 in protection against heat and oxidative stress" @default.
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• W2050892758 doi "https://doi.org/10.1016/j.exppara.2012.06.001" @default.
• W2050892758 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22691540" @default.
• W2050892758 hasPublicationYear "2012" @default.
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