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The neutralization of antibiotic action by metallic cations and iron chelators
Abstract:
The neutralization of the action of a variety of antibiotics on klebsiellae by moderate doses of di- and tri-valent metallic cations, was measured in vitro. Some beta-lactams tested were affected by Mg++ and by Cu++. Of six tetracyclines one was moderately neutralized by Ca++, two by Mg++, three by Cu++, and all, strongly, by Fe+++. Erythromycin was affected by Ca++, lincomycin by Ca++, Mg++ and Cu++. Aminoglycosides were affected by Ca++ and Mg++ and strongly by Fe+++. Five antibiotics (three beta-lactams and two macrolides) with high MICs for klebsiellae were tested against staphylococci: most of the reversing agents were ineffective. The microbial iron chelators, desferrioxamine and enterochelin were largely inactive, affecting only two aminoglycosides.
Insights
Metallic cations like iron and copper can neutralize antibiotic effectiveness against Klebsiella bacteria. This interaction impacts various antibiotic classes, including tetracyclines and aminoglycosides, highlighting potential challenges in antimicrobial therapy.
Area of Science:
- Microbiology
- Pharmacology
- Biochemistry
Background:
- Antibiotic resistance in bacteria, particularly Klebsiella, is a growing global health concern.
- The role of metal ions in modulating antibiotic activity is not fully understood.
- Understanding these interactions is crucial for developing effective antimicrobial strategies.
Purpose of the Study:
- To investigate the in vitro effect of di- and tri-valent metallic cations on the activity of various antibiotics against Klebsiella.
- To determine which antibiotic classes and specific metal ions are most involved in this neutralization phenomenon.
Main Methods:
- In vitro testing of antibiotic neutralization by metallic cations (Ca++, Mg++, Cu++, Fe+++).
- Evaluation of effects on different antibiotic classes: beta-lactams, tetracyclines, macrolides, and aminoglycosides.
- Testing antibiotic activity against Staphylococcus as a control, and assessing microbial iron chelators.
Main Results:
- Magnesium (Mg++) and copper (Cu++) ions affected some beta-lactam antibiotics.
- Iron (Fe+++) strongly neutralized all tested tetracyclines and aminoglycosides.
- Calcium (Ca++), magnesium (Mg++), and copper (Cu++) ions affected erythromycin and lincomycin.
Conclusions:
- Di- and tri-valent metallic cations can significantly neutralize the action of several antibiotic classes against Klebsiella.
- Iron ions demonstrate a potent neutralizing effect on tetracyclines and aminoglycosides.
- These findings highlight the complex interplay between metal ions and antibiotics, with implications for therapeutic efficacy.
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