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Cytotoxicity due to a reaction between polystyrene and constituents of stool
Abstract:
Cell monolayers grown in polystyrene culture plates and in glass tubes are routinely used in virology laboratories around the world for virus isolation and identification. Monolayers of different types of cells grown in polystyrene culture plates were found to show a strange cytotoxicity when inoculated with stool samples from healthy children from Bangladesh. When inoculated with 0.2 ml of a 10% stool sample 100% (80/80) of the cell monolayers established in polystyrene plates showed cytopathy by 4 days and 60% (48/80) within first 2 hours of sample inoculation. In contrast only 4% (4/90) of samples inoculated in the same type of cell monolayers but established in glass cell culture tubes showed cytopathy by 4 days; out of these 4 only 2 (2%) showed cytopathy in the first 2 hours. Cytotoxicity could be reduced to half when the amount of inoculated stool sample was reduced by half in cases where polystyrene was used as the substrate. This difference of cytopathy under two different circumstances (polystyrene substrate versus glass substrate) was statistically significant (P less than 0.001).
Insights
Cell culture substrate significantly impacts virology results. Polystyrene plates showed high cytotoxicity with stool samples, unlike glass tubes, affecting virus isolation and identification accuracy.
Area of Science:
- Virology
- Cell Biology
- Materials Science
Background:
- Cell monolayers in polystyrene plates and glass tubes are standard for virus isolation.
- Cytotoxicity in cell cultures can hinder accurate virological analysis.
- Stool samples are commonly used for detecting viral pathogens.
Purpose of the Study:
- To investigate the cause of unexpected cytotoxicity observed in cell monolayers.
- To compare the impact of polystyrene versus glass substrates on cell culture responses to stool samples.
- To determine if substrate material influences cytopathic effects in virological assays.
Main Methods:
- Cell monolayers were cultured in both polystyrene plates and glass tubes.
- Monolayers were inoculated with stool samples from healthy children.
- Cytopathic effects were monitored over time (2 hours and 4 days).
- Statistical analysis was performed to compare results between substrate types.
Main Results:
- 100% of polystyrene-based cell monolayers exhibited cytopathy within 4 days of inoculation with stool samples.
- 60% of polystyrene cultures showed cytopathic effects within 2 hours.
- In contrast, only 4% of glass-based cell cultures showed cytopathy by 4 days.
- Reducing the stool sample volume by half on polystyrene substrates halved the observed cytotoxicity.
- The difference in cytopathy between polystyrene and glass substrates was statistically significant (P < 0.001).
Conclusions:
- The substrate material (polystyrene vs. glass) significantly influences the observed cytotoxicity when using stool samples in cell culture.
- Polystyrene culture plates are associated with a high rate of false-positive cytopathic effects, potentially interfering with accurate virus isolation and identification.
- Glass cell culture tubes offer a more reliable substrate, showing minimal cytotoxicity with the same samples.
- These findings highlight the critical importance of substrate selection in virological diagnostic assays.