Mutagenic activity of concentrated drinking water samples

Area of Science:

• Environmental Health
• Toxicology
• Genetics

Background:

• Drinking water chlorination can generate unknown compounds.
• These compounds may pose a genotoxic risk.

Purpose of the Study:

• To investigate the mutagenicity of drinking water extracts.
• To assess the in vitro and in vivo genotoxicity of chlorinated drinking water contaminants.

Main Methods:

• Concentrated drinking water extracts were prepared using XAD-2 resin.
• Chromosomal aberrations were analyzed in Chinese hamster ovary (CHO) cells and human lymphocytes in vitro.
• Mice were orally dosed to assess in vivo clastogenic activity in bone marrow cells.

Main Results:

• In vitro exposure induced chromosomal aberrations in CHO cells and human lymphocytes.
• Oral administration to mice did not result in detectable clastogenic activity in bone marrow cells.
• Mutagenic compounds are generated during water chlorination and bind to protein.

Conclusions:

• Drinking water extracts exhibit in vitro genotoxicity, indicating potential risks.
• The lack of in vivo bone marrow effects suggests limited systemic exposure or rapid detoxification.
• Further research is needed to identify causative agents and assess risks in the gastrointestinal tract.