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Loss of pH control in Plasmodium falciparum parasites subjected to oxidative stress


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van Schalkwyk, Donelly A., Saliba, Kevin J., Biagini, Giancarlo ORCID:, Bray, Patrick and Kirk, Kiaran (2013) 'Loss of pH control in Plasmodium falciparum parasites subjected to oxidative stress'. PLoS ONE, Vol 8, Issue 3, e58933.

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The intraerythrocytic malaria parasite is susceptible to oxidative stress and this may play a role in the mechanism of action of some antimalarial agents. Here we show that exposure of the intraerythrocytic malaria parasite to the oxidising agent hydrogen peroxide results in a fall in the intracellular ATP level and inhibition of the parasite's V-type H(+)-ATPase, causing a loss of pH control in both the parasite cytosol and the internal digestive vacuole. In contrast to the V-type H(+)-ATPase, the parasite's digestive vacuole H(+)-pyrophosphatase is insensitive to hydrogen peroxide-induced oxidative stress. This work provides insights into the effects of oxidative stress on the intraerythrocytic parasite, as well as providing an alternative possible explanation for a previous report that light-induced oxidative stress causes selective lysis of the parasite's digestive vacuole.

Item Type: Article
Subjects: QX Parasitology > Protozoa > QX 135 Plasmodia
WC Communicable Diseases > Tropical and Parasitic Diseases > WC 750 Malaria
Faculty: Department: Biological Sciences > Department of Tropical Disease Biology
Digital Object Identifer (DOI):
Depositing User: Mary Creegan
Date Deposited: 18 Jul 2014 08:18
Last Modified: 06 Feb 2018 13:07


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