In-vitro growth inhibition of Plasmodium falciparum by retinol at concentrations present in normal human serum

Timothy Davis, T.S. Skinner-Adams, J. Beilby

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

To assess the in vitro effect of retinol on Plasmodium falciparum, the standard isolates 3D7, D10, W2 and K1 in continuous culture were exposed to retinol added in concentrations ranging from 10(-7) to 0.1 mu mol/l. Parasite growth inhibition was assessed from H-3-hypoxanthine incorporation. Triplicate experiments were performed at physiological pH and in the case of D10, additional experiments were performed at pH 7.2 and 7.6. Final media retinol concentrations were assayed using high performance liquid chromatography. Retinol inhibited growth of both asynchronous and synchronous cultures of 3D7 and D10 and asynchronous cultures of W2 and K1. IC50 values determined from assayed media concentrations ranged from 0.2 to 3.9 mu mol/l and were comparable to concentrations in normal human serum (1.0-3.0 mu mol/l). IC50 values for asychronous D10 cultures at pH 7.2 were lower than at pH 7.4 or 7.6 (0.5, 3.9 and 5.0 mu mol/l, respectively); results from synchronous cultures were similar. These data suggest that P. falciparum is a retinol-sensitive parasite, especially at pH levels equivalent to those in an acidotic patient. Adjunctive retinol therapy may have a role in clinical management of malaria. (C) 1998 Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)111-119
JournalActa Tropica
Volume69
DOIs
Publication statusPublished - 1998

Fingerprint Dive into the research topics of 'In-vitro growth inhibition of Plasmodium falciparum by retinol at concentrations present in normal human serum'. Together they form a unique fingerprint.

  • Cite this