TitleHost-parasite interactions revealed by Plasmodium falciparum metabolomics.
Publication TypeJournal Article
Year of Publication2009
AuthorsOlszewski, KL, Morrisey, JM, Wilinski, D, Burns, JM, Vaidya, AB, Rabinowitz, JD, Llinás, M
JournalCell Host Microbe
Volume5
Issue2
Pagination191-9
Date Published2009 Feb 19
KeywordsAnimals, Arginase, Arginine, Erythrocytes, Gene Knockout Techniques, Host-Parasite Interactions, Humans, Malaria, Mass Spectrometry, Metabolome, Mice, Ornithine, Plasmodium berghei, Plasmodium falciparum, Protozoan Proteins
Abstract

Intracellular pathogens have devised mechanisms to exploit their host cells to ensure their survival and replication. The malaria parasite Plasmodium falciparum relies on an exchange of metabolites with the host for proliferation. Here we describe a mass spectrometry-based metabolomic analysis of the parasite throughout its 48 hr intraerythrocytic developmental cycle. Our results reveal a general modulation of metabolite levels by the parasite, with numerous metabolites varying in phase with the developmental cycle. Others differed from uninfected cells irrespective of the developmental stage. Among these was extracellular arginine, which was specifically converted to ornithine by the parasite. To identify the biochemical basis for this effect, we disrupted the plasmodium arginase gene in the rodent malaria model P. berghei. These parasites were viable but did not convert arginine to ornithine. Our results suggest that systemic arginine depletion by the parasite may be a factor in human malarial hypoargininemia associated with cerebral malaria pathogenesis.

Alternate JournalCell Host Microbe