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M94A0731.TXT
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1994-10-21
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Document 0731
DOCN M94A0731
TI DdI susceptibility of HIV-1 isolates in patients on long-term therapy.
DT 9412
AU Land S; McGavin C; Corby S; Tyssen D; Gorry P; Magliano D; Birch C;
State HIV Isolation Laboratory, Virology Department, Fairfield;
Hospital, Victoria.
SO Annu Conf Australas Soc HIV Med. 1993 Oct 28-30;5:107 (poster no. 64).
Unique Identifier : AIDSLINE ASHM5/94348924
AB Sequential HIV isolates obtained from 18 individuals receiving
dideoxyinosine (ddI) were tested for susceptibility to the drug. All
patients had received AZI before commencing ddI therapy for up to 18
months. Susceptibility assays were performed in peripheral blood
lymphocytes infected with these isolates and maintained in 0.2 to 50
microM of ddI. The dose of infectious virus was standardised for each
assay. The mean 50% inhibitory concentration of 35 pre-therapy and 48
post-therapy isolates was 3.4 microM (range, 0.1 microM to 12.5 microM)
and 7.6 microM (range 0.1 microM to > 25 microM), respectively. Isolates
from two patients showed greater than 10-fold increase in resistance to
ddI after long term therapy. However, sequential isolates from the
remaining patients showed no significant change in ddI susceptibility
after up to 18 months of therapy. The emergence of HIV resistant to AZT
occurs in about 50% of patients after 9 months of therapy. This
contrasts with the development of ddI resistance which appears rarely or
not at all after 18 months of therapy.
DE Cells, Cultured Didanosine/*THERAPEUTIC USE Dose-Response
Relationship, Drug Human HIV Infections/*DRUG THERAPY/MICROBIOLOGY
HIV-1/*DRUG EFFECTS Long-Term Care Lymphocytes/MICROBIOLOGY Microbial
Sensitivity Tests MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).