In vitro selection of halofantrine resistance in Plasmodium falciparum is not associated with increased expression of Pgh1.

Abstract:

:Recent investigations into quinoline and phenanthrene methanol resistance in Plasmodium falciparum have described a linkage between amplification of the mdr homologue pfmdr1 and decreased susceptibility to mefloquine (MQ) and halofantrine (HF). We have examined the current theories on cross-resistance patterns and pfmdr1 gene expression by comparing the chloroquine (CQ) resistant isolate K1 with K1Hf, developed from the K1 isolate by intermittent exposure to halofantrine. Reduced halofantrine susceptibility in K1Hf was accompanied by reduced sensitivity to mefloquine and increased sensitivity to chloroquine. These sensitivity changes were reflected by changes in parasite drug accumulation. The loss of high level chloroquine resistance in K1Hf was associated with an inability of verapamil to enhance chloroquine sensitivity or accumulation. In contrast verapamil retained the chemosensitising potential against quinine in this isolate. The changes in phenotype were achieved without any amplification or increased expression of pfmdr1 or reversion of the Tyr86 mutation in the gene. Our data indicates that acquisition of halofantrine and mefloquine resistance and the loss of high level chloroquine resistance can be achieved without enhanced expression of the pfmdr1 gene product.

journal_name

Mol Biochem Parasitol

authors

Ritchie GY,Mungthin M,Green JE,Bray PG,Hawley SR,Ward SA

doi

10.1016/s0166-6851(96)02746-6

subject

Has Abstract

pub_date

1996-12-02 00:00:00

pages

35-46

issue

1

eissn

0166-6851

issn

1872-9428

pii

S0166685196027466

journal_volume

83

pub_type

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