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Bacteriological investigations with beta-lactamase inhibitors
Zentralblatt Fur Bakteriologie, Mikrobiologie Und Hygiene. 1. Abt. Originale A, Medizinische Mikrobiologie, Infektionskrankheiten Und Parasitologie = International Journal of Microbiology and Hygiene. A, Medical Microbiology, Infectious
|June 1, 1982
Summary
Beta-lactamase inhibitors like clavulanic acid show synergistic effects with antibiotics against resistant bacteria. Simultaneous administration of inhibitors and penicillins is crucial for optimal efficacy.
Area of Science:
- Microbiology
- Pharmacology
- Biochemistry
Background:
- Beta-lactamase enzymes confer resistance to beta-lactam antibiotics in various bacterial pathogens.
- The emergence of antibiotic resistance necessitates the development of strategies to overcome enzymatic inactivation.
Purpose of the Study:
- To evaluate the synergistic activity of beta-lactamase inhibitors, clavulanic acid and penicillanic acid sulfone, in combination with antibiotics against beta-lactamase-producing bacteria.
- To determine the efficacy of these combinations against specific beta-lactamase types.
Main Methods:
- Minimum Inhibitory Concentrations (MICs) were determined for P. aeruginosa, E. coli, P. vulgaris, P. rettgeri, E. cloacae, K. pneumoniae, S. marcescens, and S. aureus.
- Antibiotics tested included piperacillin, amoxycillin, and penicillin G, in combination with varying concentrations of clavulanic acid and penicillanic acid sulfone.
- Bacterial growth was monitored using a biophotometer to assess synergistic effects.
Main Results:
- All tested bacterial strains exhibited resistance to the antibiotics alone.
- Piperacillin combined with clavulanic acid showed synergistic activity against Klebsiella sp., indol-positive Proteus sp., and E. coli.
- Both inhibitors demonstrated synergistic efficacy against S. aureus and were active against constitutive penicillinase, OXA-2, OXA-3, and SHV-1 beta-lactamases, with varying activity against other types.
Conclusions:
- Clavulanic acid and penicillanic acid sulfone can restore antibiotic susceptibility in beta-lactamase-producing bacteria.
- The effectiveness of inhibitors varies depending on the specific beta-lactamase enzyme.
- Simultaneous administration of beta-lactamase inhibitors and penicillins is essential for achieving optimal synergistic effects and combating antibiotic resistance.