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Inhibition of the growth of Plasmodium falciparum in vitro by covalent modification of hemoglobin

Identifieur interne : 003635 ( Main/Exploration ); précédent : 003634; suivant : 003636

Inhibition of the growth of Plasmodium falciparum in vitro by covalent modification of hemoglobin

Auteurs : Timothy G. Geary [États-Unis] ; Edward J. Delaney [États-Unis] ; Irving M. Klotz [États-Unis] ; James B. Jensen [États-Unis]

Source :

RBID : ISTEX:743D7016D02186C01D04B17661B6B226E1627357

English descriptors

Abstract

Abstract: Antimalarial effects might be expected from compounds that modify hemoglobin. Dibromoaspirin and bis(dibromosalicyl) diesters decrease gelation of hemoglobin by specific covalent modification (acetylation and crosslinking) of this protein but do not interfere with oxygen transport. These compounds were toxic to malaria parasites when continuously present in culture, as were drugs with similar pharmacological effects such as indomethacin, ibuprofen, and phenylbutazone. Aspirin and acetaminophen were much less effective. When erythrocytes were pretreated with these compounds prior to parasite exposure, only dibromoaspirin and dibromosalicyl diesters prevented parasite development. The modified hemoglobin was highly resistant to digestion by cathepsin D and parasite proteases, suggesting that covalent modifications of hemoglobin that do not disrupt normal hemoglobin function have antimalarial effects.

Url:
DOI: 10.1016/0166-6851(83)90057-9


Affiliations:


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Le document en format XML

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<term>Antimalarial activity</term>
<term>Antimalarial effects</term>
<term>Aspirin</term>
<term>Cathepsin</term>
<term>Chloroquine</term>
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<term>Human serum</term>
<term>Ibuprofen</term>
<term>Indomethacin</term>
<term>Initial exposure</term>
<term>Klotz</term>
<term>Malaria</term>
<term>Malaria parasites</term>
<term>Modification</term>
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<term>Parasite</term>
<term>Parasite development</term>
<term>Parasite protease</term>
<term>Parasite proteases</term>
<term>Parasite survival</term>
<term>Parasitemia</term>
<term>Parasitol</term>
<term>Phenylbutazone</term>
<term>Plasmodium</term>
<term>Plasmodium falciparum</term>
<term>Plasmodiumfalciparum</term>
<term>Pretreated</term>
<term>Pretreated erythrocytes</term>
<term>Protease</term>
<term>Ring stage</term>
<term>Ring stage parasites</term>
<term>Rpmi</term>
<term>Schizonts</term>
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<div type="abstract" xml:lang="en">Abstract: Antimalarial effects might be expected from compounds that modify hemoglobin. Dibromoaspirin and bis(dibromosalicyl) diesters decrease gelation of hemoglobin by specific covalent modification (acetylation and crosslinking) of this protein but do not interfere with oxygen transport. These compounds were toxic to malaria parasites when continuously present in culture, as were drugs with similar pharmacological effects such as indomethacin, ibuprofen, and phenylbutazone. Aspirin and acetaminophen were much less effective. When erythrocytes were pretreated with these compounds prior to parasite exposure, only dibromoaspirin and dibromosalicyl diesters prevented parasite development. The modified hemoglobin was highly resistant to digestion by cathepsin D and parasite proteases, suggesting that covalent modifications of hemoglobin that do not disrupt normal hemoglobin function have antimalarial effects.</div>
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