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The effect of nitric oxide on the growth of Plasmodium falciparum, P-chabaudi and P-berghei in vitro

Lookup NU author(s): Dr Helen PhillipsORCiD


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Protective immune mechanisms to the asexual erythrocytic stages of the malaria parasite Plasmodium chabaudi AS strain include antibody-independent mechanisms. Nitric oxide (NO) is produced during the infection and indirect evidence suggests that it can contribute to the antiparasitic mechanisms. We examined the effect of an NO producer, S-nitroso-acetyl-penicillamine (SNAP), on the growth and survival in vitro of P. chabaudi AS, P. berghei and P. falciparum. Growth of the parasites was monitored by the uptake of tritiated hypoxanthine and, in the case of P. falciparum, by morphological examination in stained blood smears. dl-penicillamine and sodium nitrite, as controls, had no inhibitory activity at the concentrations used. The results showed that at SNAP concentrations of approximately 182 mu m and above NO was cytotoxic to P. falciparum but, at lower concentrations, there was a cytostatic effect and some parasites resumed growth and division after NO production had ceased. Rings were less susceptible to NO effects than later stages in the asexual cycle. The antimalarial activity of NO from SNAP also extended to the rodent parasites but, under the experimental conditions used, they were less sensitive than the human species. In the cultures of P. chabaudi, increasing the numbers of noninfected erythrocytes present did not diminish the antimalarial activity of SNAP, suggesting that here at least haemoglobin was not scavenging NO significantly.

Publication metadata

Author(s): Phillips HM; Balmer P; Maestre AE; McMonagle FA; Phillips RS

Publication type: Article

Publication status: Published

Journal: Parasite Immunology

Year: 2000

Volume: 22

Issue: 2

Pages: 97-106

ISSN (print): 0141-9838

ISSN (electronic): 1365-3024

Publisher: Wiley-Blackwell Publishing Ltd.


DOI: 10.1046/j.1365-3024.2000.00281.x


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