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. 1988 Aug;85(16):5956–5960. doi: 10.1073/pnas.85.16.5956

The role of lipids in Plasmodium falciparum invasion of erythrocytes: a coordinated biochemical and microscopic analysis.

R B Mikkelsen 1, M Kamber 1, K S Wadwa 1, P S Lin 1, R Schmidt-Ullrich 1
PMCID: PMC281884  PMID: 3045809

Abstract

The role of lipids in Plasmodium falciparum invasion of erythrocytes was investigated by biochemical and fluorescent microscopic analysis. Metabolic incorporation of radioactive oleate or palmitate and fractionation of radiolabeled phospholipids by thin-layer chromatography revealed no difference in the major phospholipid classes of schizonts and early ring forms after merozoite invasion. Fluorescent anthroyloxy derivatives of oleate and palmitate were also metabolically incorporated into parasite phospholipids. By microscopic analysis, the fluorescent phospholipids were seen localized in the plasma membrane and, within the merozoite, concentrated near the apical end. During invasion fluorescent phospholipid appeared to be injected from the apical end of the merozoite into the host membrane, both within and outside the parasite-host membrane junctions. After invasion fluorescent lipid was only found in the parasite plasma membrane and/or parasitophorous vacuole membrane. Parallel experiments with a fluorescent cholesterol derivative, incorporated into parasite membranes by exchange, revealed neither heterogeneous distribution of label within the parasite nor evidence for cholesterol transfer from merozoite to host cell membrane. Results suggest that during invasion no major covalent alteration of parasite lipids, such as lysophospholipid formation, occurs. However, invasion and formation of the parasitophorous vacuolar membrane apparently involves insertion of parasite phospholipids into the host membrane.

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