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M9490500.TXT
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1994-09-24
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Document 0500
DOCN M9490500
TI Rifabutin and sparfloxacin but not azithromycin inhibit binding of
Mycobacterium avium complex to HT-29 intestinal mucosal cells.
DT 9411
AU Bermudez LE; Young LS; Inderlied CB; Kuzell Institute for Arthritis and
Infectious Diseases,; California Pacific Medical Center Research
Institute, San; Francisco 94115.
SO Antimicrob Agents Chemother. 1994 May;38(5):1200-2. Unique Identifier :
AIDSLINE MED/94346836
AB Organisms of the Mycobacterium avium complex (MAC) cause disseminated
disease in patients with AIDS, and evidence points to the
gastrointestinal tract as the major route of infection. Since MAC can
bind to and invade intestinal mucosal cells, we examined whether
subinhibitory concentrations of antibiotics which have anti-MAC activity
in vitro affect the interaction between MAC and HT-29 intestinal mucosal
cells. MAC isolates were exposed to subinhibitory concentrations of
rifabutin (MIC, 2.6 micrograms/ml), sparfloxacin (MIC, 8.4
micrograms/ml), or azithromycin (MIC, 32 micrograms/ml) for 30 to 120
min, washed, and incubated with HT-29 cell monolayers for 2 h at 4
degrees C. HT-29 cell monolayers were then washed to remove unbound
bacteria and were subsequently lysed. The number of MAC isolates that
bound to the HT-29 cells was determined by plating the cell lysate onto
7H10 agar. Preincubation of the MAC isolates with rifabutin at
concentrations of 1 and 2 micrograms/ml reduced MAC binding to HT-29
cells by 80 to 90%, while MAC exposed to sparfloxacin at 1 and 7
micrograms/ml inhibited binding by 77 to 93%. Azithromycin at
concentrations of 2, 10, and 30 micrograms/ml had no effect on MAC
binding to HT-29 cells. Inhibition of MAC binding to the
gastrointestinal mucosa may be one underlying mechanism for the
prophylactic effects of rifabutin and quinolones.
DE Anti-Infective Agents, Fluoroquinolone/*PHARMACOLOGY
Azithromycin/*PHARMACOLOGY Bacterial Adhesion/*DRUG EFFECTS Human
Intestinal Mucosa/CYTOLOGY/*MICROBIOLOGY Mycobacterium avium
Complex/*DRUG EFFECTS Mycobacterium avium-intracellulare
Infection/MICROBIOLOGY Quinolones/*PHARMACOLOGY
Rifabutin/*PHARMACOLOGY Tumor Cells, Cultured JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).