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1996-02-26
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Document 0031
DOCN M9620031
TI Cross-resistance analysis of human immunodeficiency virus type 1
variants individually selected for resistance to five different protease
inhibitors.
DT 9602
AU Tisdale M; Myers RE; Maschera B; Parry NR; Oliver NM; Blair ED; Wellcome
Research Laboratories, Beckenham, Kent, United Kingdom.
SO Antimicrob Agents Chemother. 1995 Aug;39(8):1704-10. Unique Identifier :
AIDSLINE MED/96100736
AB Human immunodeficiency virus type 1 (HIV-1) protease inhibitor-resistant
variants, isolated on passage of HIV-1HXB2 in MT-4 cells with five
different protease inhibitors, have been examined for cross-resistance
to five inhibitors. The protease inhibitors studied were Ro 31-8959,
A-77003, XM323, L-735,524, and VX-478. Resistant variants with two to
four mutations within their protease sequence and 9- to
40-fold-decreased susceptibility were selected for all five inhibitors
within six to eight passes in cell culture. Passage of a
zidovudine-resistant mutant in Ro 31-8959 generated a dual reverse
transcriptase- and protease-resistant virus. Variants were cloned
directly into a modified pHXB2-D infectious clone for cross-resistance
analysis. Although the resistant variants selected possessed different
combinations of protease mutations for each inhibitor, many showed
cross-resistance to the other inhibitors, and one showed
cross-resistance to all five inhibitors. Interestingly, some mutants
showed increased susceptibility to some inhibitors. Further HIV passage
studies in the combined presence of two protease inhibitors demonstrated
that in vitro it was possible to delay significantly selection of
mutations producing resistance to one or both inhibitors. These studies
indicate that there may be some rationale for combining different
protease inhibitors as well as protease and reverse transcriptase
inhibitors in HIV combination therapy.
DE Amino Acid Sequence Base Sequence Cell Line Drug Resistance,
Microbial Human HIV Protease/GENETICS HIV Protease
Inhibitors/*PHARMACOLOGY HIV-1/*DRUG EFFECTS/ENZYMOLOGY/GENETICS
Molecular Sequence Data Mutation Polymerase Chain Reaction Reverse
Transcriptase Inhibitors/PHARMACOLOGY Support, Non-U.S. Gov't
Zidovudine/PHARMACOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).