Microbial contamination of cell cultures: a 2 years study

Area of Science:

• Microbiology
• Cell Biology
• Biotechnology

Background:

• Cell line contamination poses a significant threat to global cell banks, leading to the loss of critical biological products and valuable research.
• Contamination can arise from diverse sources, including chemicals, invertebrates, bacteria, fungi, parasites, viruses, and other cell lines.

Purpose of the Study:

• To investigate the prevalence and types of microbial contamination in cell lines at the Pasteur Institute of Iran (CGBRI).
• To identify the specific causative agents responsible for cell line contamination within the CGBRI cell banks.

Main Methods:

• A retrospective study was conducted over two years (2002-2004) on cell lines from various species (human, fish, insect, animal).
• Sterility tests were performed upon cell line receipt and after each sub-culture.
• Conventional microbiological techniques were employed to detect bacterial (including mycoplasmas) and fungal contamination.

Main Results:

• 39% of the examined cell line specimens showed microbial contamination.
• Mycoplasmas were the predominant contaminants (19%), followed by mixed infections (8%), fungi (8%), and bacteria (4%).
• Key bacterial contaminants included Bacillus sp., Enterococcus sp., and Staphylococcus sp. Aspergillus sp., Penicillium sp., Sepedonium sp., and Botrytis sp. were the main fungal agents.

Conclusions:

• This study provides the first report on cell culture contamination from cell banks in Iran, highlighting a substantial contamination rate.
• Mycoplasma contamination represents a major challenge for the CGBRI cell bank, necessitating improved control measures.
• Understanding specific contamination patterns is crucial for maintaining the integrity of cell banks and ensuring reliable research outcomes.