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Antimicrobial Agents and Chemotherapy, March 1998, p. 682-686, Vol. 42, No. 3
0066-4804/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Relationship between Antimalarial Drug Activity, Accumulation, and Inhibition of Heme Polymerization in Plasmodium falciparum In Vitro

Shaun R. Hawley,1 Patrick G. Bray,2 Mathirut Mungthin,2 Jill D. Atkinson,2 Paul M. O'Neill,2 and Stephen A. Ward2,*

Department of Pharmacology and Therapeutics2 and Department of Human Anatomy and Cell Biology,1 University of Liverpool, Liverpool L69 3BX, United Kingdom

Received 25 September 1997/Returned for modification 5 November 1997/Accepted 10 December 1997

We have investigated the contribution of drug accumulation and inhibition of heme polymerization to the in vitro activities of a series of antimalarial drugs. Only those compounds exhibiting structural relatedness to the quinolines inhibited heme polymerization. We could find no direct correlation between in vitro activity against chloroquine-susceptible or chloroquine-resistant isolates and either inhibition of heme polymerization or cellular drug accumulation for the drugs studied. However, in vitro activity against a chloroquine-susceptible isolate but not a chloroquine-resistant isolate showed a significant correlation with inhibition of heme polymerization when the activity was normalized for the extent of drug accumulation. The importance of these observations to the rational design of new quinoline-type drugs and the level of agreement of these conclusions with current views on quinoline drug action and resistance are discussed.


* Corresponding author. Mailing address: Department of Pharmacology and Therapeutics, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, United Kingdom. Phone: 0151 794 8219. Fax: 0151 794 8217. E-mail: saward{at}liv.ac.uk.


Antimicrobial Agents and Chemotherapy, March 1998, p. 682-686, Vol. 42, No. 3
0066-4804/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.



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