Increased fluidity of Plasmodium berghei-infected mouse red blood cell membranes detected by electron spin resonance spectroscopy

David R. Allred, Charles R. Sterling, Philip D. Morse

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

The fluidity of Plasmodium berghei-infected mouse red cell membranes is increased over that of uninfected cells at both 24°C and 37°C. This was demonstrated by electron spin resonance spectroscopy using the hydrocarbon spin labels 2-dodecyl-2′,5,5′-trimethyloxazolidine-N-oxyl and 2-heptyl-2′ -hexyl-5,5′-dimethyloxazolidine-N-oxyl to label regions of the bilayer near its surface, and deeper within the hydrocarbon region, respectively. Arrhenius plots of the 'empirical motion parameter' (Ri) obtained from 2-heptyl-2′-hexyl-5,5′-dimethyloxazolidine-N-oxyl-labeled cells versus temperature over the range from 0 to 45°C showed an hysteretic behavior of the spin labels in the membranes of both mature and immature uninfected cells. Such hysteretic behavior was consistently lacking in membranes of infected cells. These differences in membrane fluidity and spin label behavior are interpreted to reflect biochemical modifications of the red cell membrane which occur with infection by the malarial parasite.

Original languageEnglish (US)
Pages (from-to)27-39
Number of pages13
JournalMolecular and Biochemical Parasitology
Volume7
Issue number1
DOIs
StatePublished - Jan 1983

Keywords

  • Electron spin resonance
  • Malaria
  • Membrane fluidity
  • Plasmodium berghei
  • Red blood cell membrane
  • Spin labels

ASJC Scopus subject areas

  • Parasitology
  • Molecular Biology

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