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The chemotherapy of Plasmodium berghei. II. Antagonism of the action of drugs

Published online by Cambridge University Press:  06 April 2009

June P. Thurston
June P. Thurston
Affiliation:
The Molteno Institute, University of Cambridge, and the National Institute for Medical Research, London
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Extract

The action of pyrimethamine, sulphadiazine, proguanil and its active metabolite CPT, and 2:4-diaminopteridines against infections of Plasmodium berghei in mice was antagonized by P–aminobenzoic acid and by pteroylglutamic acid. Antagonism was in some instances detected only when P–aminobenzoic acid was given in solution in the drinking water as well as being injected subcutaneously. No antagonism was detected with a number of amino acids and nucleic acid derivatives.

As all of the above group of drugs can be antagonized by P–aminobenzoic acid and by pteroylglutamic acid, it would seem that they are alike in their mode of action. There must, however, be some differences between the mode of action or absorption of these drugs because species of Plasmodium that are very sensitive to the action of one of these drugs are frequently not very sensitive to the action of others.

As P. berghei is dependent on p–aminobenzoic acid, it is suggested that it can utilize this compound in the synthesis of pteroylglutamic acid to a greater extent than can P. gallinaceum, and that it resembles P. knowlesi more than other species of Plasmodium.

Type
Research Article
Information
Parasitology , Volume 44 , Issue 1-2 , May 1954 , pp. 99 - 110
Copyright
Copyright © Cambridge University Press 1954

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