A simple method to eliminate mycoplasma from cell cultures

Area of Science:

• Cell Biology
• Microbiology
• Pharmacology

Background:

• Chronic mycoplasma contamination poses a significant challenge in cell culture, potentially affecting experimental results.
• Mycoplasma orale II is a common contaminant in eukaryotic cell lines, including Vero cells.
• Existing treatments for mycoplasma contamination may have limitations in efficacy or cell toxicity.

Purpose of the Study:

• To evaluate the efficacy of various antibiotic treatments for eradicating Mycoplasma orale II from contaminated Vero cells.
• To identify an optimal antibiotic regimen that is effective, non-cytotoxic, and prevents recurrence.
• To assess the applicability of the identified treatment to other contaminated eukaryotic cell lines.

Main Methods:

• Vero cells chronically contaminated with Mycoplasma orale II were treated with different antibiotics (Minocycline, Kanamycin, Tylosine, Roxitromycin) at non-cytotoxic concentrations.
• Antibiotics were tested individually and in combination.
• The efficacy of the treatment regimen was assessed by monitoring mycoplasma eradication and cell viability/growth.

Main Results:

• A specific regimen involving Tylosine (250 µg/ml) for 12 days followed by Minocycline (5 µg/ml) for 10 days effectively eradicated Mycoplasma contamination.
• This treatment regimen showed no deleterious effects on cell growth.
• The treatment was effective after a single application and successfully eradicated mycoplasma from other tested eukaryotic cell lines.

Conclusions:

• The combination of Tylosine and Minocycline provides a highly effective and safe method for eliminating Mycoplasma orale II contamination in cell cultures.
• This regimen offers a reliable solution for maintaining mycoplasma-free cell lines, crucial for accurate biological research.
• The successful eradication across multiple cell lines suggests broad applicability of this treatment protocol.