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1994-09-05
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Document 0816
DOCN M9480816
TI Intracellular activity of roxithromycin used alone and in association
with other drugs against the Mycobacterium avium complex in human
macrophages.
DT 9410
AU Rastogi N; Labrousse V; Bryskier A; Institut Pasteur, Point-a-Pitre,
Guadeloupe, French West Indies.
SO Abstr Gen Meet Am Soc Microbiol. 1994;94:9 (abstract no. A-44). Unique
Identifier : AIDSLINE ASM94/94313129
AB Activity of roxithromycin alone or in association with ethambutol,
ofloxacin, rifampin, amikacin and clofazimine against 5 clinical
isolates of MAC (3 from HIV+ and 2 from HIV- patients) growing in human
macrophages was assessed. Macrophage monolayers were allowed to
phagocytize bacteria for 4 h at 37 degrees C. After phagocytosis, fresh
medium containing drugs was refed to infected cells and the
intracellular bacteria are enumerated 5 days after the drug addition. In
accordance with our experimental model for determining intracellular
action of drugs, all the drugs are used at their reported Cmax levels;
roxithromycin, 10 micrograms/ml; ethambutol, 6 micrograms/ml; ofloxacin,
5 micrograms/ml; rifampin, 15 micrograms/ml; amikacin, 20 micrograms/ml;
and clofazimine, 2.5 micrograms/ml. The results were compared with the
intracellular growth in control, untreated macrophages. A drug used
alone or in combination was considered bactericidal intracellularly only
if it effectively reduced the bacterial viable counts in the test
samples as compared to the initial inoculum. Roxithromycin used alone
showed bactericidal activity against all the MAC isolates. Its
combination with rifampin, clofazimine or amikacin was highly
bactericidal and this bactericidal activity was further enhanced by
ethambutol.
DE Amikacin/TOXICITY AIDS-Related Opportunistic Infections/*MICROBIOLOGY
Cells, Cultured Clofazimine/TOXICITY Comparative Study
Ethambutol/TOXICITY Human *HIV Seronegativity *HIV Seropositivity
Macrophages/MICROBIOLOGY/*PHYSIOLOGY Mycobacterium avium Complex/*DRUG
EFFECTS/GROWTH & DEVELOPMENT/ ISOLATION & PURIF Ofloxacin/TOXICITY
Phagocytosis Rifampin/TOXICITY Roxithromycin/*TOXICITY MEETING
ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).