An in vitro Investigation of the Bioactivities of Ciprofloxacin and the New Fluoroquinolone Agents Clinafloxacin (CI-960) and PD 131628 against Mycobacteriumtuberculosis in Human Macrophages
| Autor: | C. E. J. Van Rensburg, G. Jooné, Ronald Anderson |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Pharmacology
Tuberculosis medicine.drug_class Monocyte Antibiotics General Medicine Biology medicine.disease biology.organism_classification Microbiology Ciprofloxacin Mycobacterium tuberculosis chemistry.chemical_compound Infectious Diseases medicine.anatomical_structure Oncology chemistry Drug Discovery medicine Pharmacology (medical) Clinafloxacin Rifampicin Antibacterial agent medicine.drug |
| Zdroj: | Chemotherapy. 41:234-238 |
| ISSN: | 1421-9794 0009-3157 |
| DOI: | 10.1159/000239350 |
| Popis: | In this study the intracellular bioactivity of ciprofloxacin and the new fluoroquinolone agents clinafloxacin (CI-960) and PD 131628 against Mycobacterium tuberculosis (H37Rv) was compared with rifampicin using human macrophages. Monocyte-derived macrophages were infected with M. tuberculosis in the presence of 10% autologous serum and treated with the antibiotics for 2 days, either immediately after infection or 3 days post-infection. The survival of the intracellular microorganisms was determined using the BACTEC tuberculosis system. Clinafloxacin, although not as active, compared favourably with rifampicin at concentrations ranging from 0.1 to 5 µg/ml in both systems, whereas PD 131628 performed reasonably well only when added directly after infection. However, ciprofloxacin was relatively unimpressive with intracellular bioactivity detected only with the highest concentration used (5 µg/ml). The ability of clinafloxacin, but not PD 131628, to inhibit mycobacteria after most of the organisms have escaped from the fused phagosomes emphasizes the importance of using a prolonged incubation time after infection when screening new antituberculosis drugs for intracellular bioactivity. |
| Databáze: | OpenAIRE |
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