Accession Number:

ADA285138

Title:

Nitric Oxide-Mediated Antiplasmodial Activity in Human and Murine Hepatocytes Induced by Gamma Interferon and the Parasite Itself: Enhancement by Exogenous Tetrahydrobiopterin

Descriptive Note:

Journal article

Corporate Author:

NAVAL MEDICAL RESEARCH INST BETHESDA MD

Report Date:

1994-09-01

Pagination or Media Count:

5.0

Abstract:

Expression of inducible nitric oxide NO synthase has been shown to inhibit the development of several pathogens, including fungi, bacteria, parasites, and viruses. However, there is still controversy as to whether this effector mechanism can inhibit the development of human pathogens. We now report that gamma interferon IFN-gamma induces the elimination of Plasmodium falciparum-infected primary human hepatocytes from cultures and that the antimalarial activity is dependent on NO. Infection with the parasite alone in the absence of added IFN-gamma caused a 10-fold increase in NO formation. Both spontaneous inhibition and IFN-gamma-induced inhibition of Plasmodium yoelii- infected murine hepatocytes were increased with the addition of the NO synthase cofactor tetrahydrobiopterin, or spiapterin, which is converted to tetrahydrobiopterin. These results indicate that under in vitro conditions the parasite itself provides a signal that triggers induction of the NO pathway in human and murine hepatocytes and that NO formation in infected hepatocytes is limited by tetrahydrobiopterin availability

Subject Categories:

  • Medicine and Medical Research
  • Inorganic Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE