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. 1985 Jan;82(2):548–551. doi: 10.1073/pnas.82.2.548

Oxidative stress and protective mechanisms in erythrocytes in relation to Plasmodium vinckei load.

R Stocker, N H Hunt, G D Buffinton, M J Weidemann, P H Lewis-Hughes, I A Clark
PMCID: PMC397077  PMID: 3855565

Abstract

The protection of mouse erythrocytes (RBC) parasitized with Plasmodium vinckei vinckei against activated oxygen species was examined in relation to the intraerythrocytic parasite load. RBC from highly infected animals were separated by density gradient centrifugation into six bands with increasing parasite content and with parasitemias ranging from 17% to 100%. Increase in parasite load was accompanied by a decrease in the activities of the enzymes superoxide dismutase (EC 1.15.1.1), catalase (EC 1.11.1.6), glutathione peroxidase (EC 1.11.1.9), glutathione reductase [NAD(P)H] (EC 1.6.4.2), and NADH-methemoglobin reductase (EC 1.6.2.2; NADH:ferricytochrome b5 oxidoreductase) in the RBC lysates. In contrast, the total amount of reduced glutathione increased in the highly parasitized bands. Furthermore, the vitamin E content of all RBC bands, including the one that contained mainly nonparasitized erythrocytes, was 3- to 5-fold higher than that of control noninfected RBC. Increasing parasite load was accompanied by an increase in the production of malonyldialdehyde, indicating enhanced lipid peroxidation. Our results indicate that oxidative stress is experienced by all RBC during a malarial infection and is accompanied by a variety of changes in the antioxidant defense mechanisms of the host and the parasite. Furthermore, it appears that the plasma membrane of the host cell is better protected against oxidative injury than are the membranes surrounding the parasite.

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Selected References

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