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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).
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