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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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