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Sister chromatid exchanges in human lymphocytes treated with silica
J C Pairon1, M C Jaurand, L Kheuang
1INSERM Unité 139, Hôpital Henri Mondor, Créteil, France.
British Journal of Industrial Medicine
|February 1, 1990
Summary
Tridymite particles significantly increased sister chromatid exchanges (SCEs) in human immune cells, but only when monocytes were present. This suggests monocyte phagocytosis is key for tridymite
Area of Science:
- Environmental Health
- Toxicology
- Cell Biology
Background:
- Silica polymorphs like quartz and tridymite are common industrial and environmental exposures.
- Sister chromatid exchanges (SCEs) are indicators of DNA damage and genotoxicity.
Purpose of the Study:
- To investigate the genotoxic potential of Min U Sil quartz and tridymite particles.
- To determine if these silica particles induce sister chromatid exchanges (SCEs) in human lymphocytes.
Main Methods:
- Human lymphocytes and monocytes co-cultures were treated with varying doses of tridymite and quartz.
- Human purified lymphocytes were used as a control.
- SCE levels were measured to assess genotoxicity.
Main Results:
- Tridymite significantly enhanced SCEs in lymphocyte-monocyte co-cultures at the highest dose (50 µg/cm²).
- No significant effect on SCEs was observed in purified human lymphocytes.
- Quartz did not yield conclusive results.
- Experiments with tridymite filtrates indicated that monocyte phagocytosis is a prerequisite for SCE induction.
Conclusions:
- Tridymite exposure can induce genotoxic effects (SCEs) in human lymphocytes, but this requires the presence of monocytes.
- Monocyte phagocytosis of tridymite particles appears to be a critical mechanism for initiating genotoxicity in lymphocytes.
- The genotoxic potential of Min U Sil quartz requires further investigation.