Bactericidal antibiotics induce mitochondrial dysfunction and oxidative damage in Mammalian cells

Area of Science:

• Biomedical Science
• Pharmacology
• Cell Biology

Background:

• Prolonged antibiotic use causes side effects like ototoxicity and nephrotoxicity.
• Mechanisms of antibiotic toxicity in mammals are not fully understood.
• Bactericidal antibiotics may induce reactive oxygen species (ROS) in bacteria.

Purpose of the Study:

• Investigate if bactericidal antibiotics cause mitochondrial dysfunction and ROS overproduction in mammalian cells.
• Determine if these effects lead to oxidative damage.
• Explore strategies to mitigate antibiotic-induced oxidative stress.

Main Methods:

• Treatment of mammalian cells and mice with clinically relevant doses of bactericidal antibiotics (quinolones, aminoglycosides, β-lactams).
• Assessment of mitochondrial function, ROS production, and oxidative damage markers (DNA, proteins, lipids).
• Evaluation of N-acetyl-l-cysteine (antioxidant) and bacteriostatic antibiotics for protective effects.

Main Results:

• Bactericidal antibiotics induced mitochondrial dysfunction and ROS overproduction in mammalian cells.
• Observed oxidative damage to cellular components (DNA, proteins, lipids).
• Mice showed increased oxidative stress markers, tissue damage, and antioxidant gene expression.

Conclusions:

• Bactericidal antibiotics contribute to oxidative tissue damage in mammalian cells.
• N-acetyl-l-cysteine and bacteriostatic antibiotics can mitigate or prevent this damage.
• Findings suggest strategies to improve antibiotic safety and reduce patient side effects.