The effects of tobramycin on MG63 cell viability and function

Area of Science:

• Orthopaedic Surgery
• Biomaterials Science
• Cell Biology

Background:

• Bone infections and defects pose significant challenges in orthopaedic surgery.
• Systemic antibiotics have poor bone penetration, necessitating local delivery of antibacterials.
• Aminoglycosides like Tobramycin offer high local concentrations but have known toxicities.

Purpose of the Study:

• To investigate the effects of Tobramycin on osteoblast-like cells.
• To assess Tobramycin's impact on osteoblast metabolic function and cell viability.
• To determine potential implications for Tobramycin use in orthopaedic bone healing.

Main Methods:

• MG63 osteoblast-like cells were exposed to varying Tobramycin concentrations (0-100 microM) for 24, 48, and 72 hours.
• Cellular metabolic function was assessed using a Glutathione assay.
• Cell membrane viability was evaluated using the MDA assay.

Main Results:

• Tobramycin concentrations above the minimum inhibitory concentration (MIC) led to significant reductions in cell number by 48 hours.
• Increased cell membrane damage (MDA levels) was observed with Tobramycin treatment.
• Elevated intracellular Glutathione levels at 24 hours indicated impaired metabolic function.

Conclusions:

• Tobramycin exhibits dose-dependent toxicity to osteoblast-like cells.
• The observed toxicity may compromise osteoblast function, potentially hindering bone formation and healing.
• These findings suggest caution regarding Tobramycin's use for antibacterial prophylaxis in orthopaedic surgery.