Cytotoxicity assays as tools to assess water quality in the Sinos River basin.
Cytotoxicity assays using cell cultures may be an alternative to assess biological toxicity of surface waters and may help to improve the control of water quality. This study compared two methods to prepare culture media for the exposure of Hep-2 cells to water samples collected from the Rolante River, an important affluent of the Sinos River. The toxicity was evaluated using the MTT and neutral red assays. Two methods were used to prepare culture media. In method 1, the sample was diluted at 1:1, 1:10, 1:100, 1:1000, 1:10.000 (v/v, sample/medium) in a standard culture medium; in method 2, water samples were used as the solvent for the culture medium, which was prepared at concentrations of 100, 80, 60, 40 and 20%. Semi-confluent cultures were then exposed to the media test for 24 hours, and cytotoxicity was determined immediately using the MTT and NR assays. Mitochondrial activity (MTT) was significantly lower at all concentrations in both methods, except at 1:1000 in method 1. However, the lysosome viability (NR) results revealed cytotoxicity only in the 1:1 sample of method 1. Both culture preparation methods were efficient and sensitive to the MTT assay, but method 2 seemed to be more adequate for the NR assay. The Rolante River has cytotoxic contaminants to Hep-2 cells, which may be one of the explanations for the poor water quality of the Sinos River basin.
Instituto de Ciências da Saúde, Universidade Feevale, Novo Hamburgo, RS, BR.
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Trintinaglia
Universidade Feevale, Novo Hamburgo, RS, BR.
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Bianchi
Programa de Pós-Graduação em Qualidade Ambiental, Instituto de Ciências da Saúde, Universidade Feevale, Novo Hamburgo, RS, BR.
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Silva
Programa de Pós-Graduação em Qualidade Ambiental, Instituto de Ciências Exatas e Tecnológicas, Universidade Feevale, Novo Hamburgo, RS, BR.
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Nascimento
Programa de Pós-Graduação em Qualidade Ambiental, Instituto de Ciências da Saúde, Universidade Feevale, Novo Hamburgo, RS, BR.
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Spilki
Programa de Pós-Graduação em Qualidade Ambiental, Instituto de Ciências da Saúde, Universidade Feevale, Novo Hamburgo, RS, BR.
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Ziulkoski
D001938:Brazil; D018929:Cell Culture Techniques / Q000379:methods*; D045744:Cell Line, Tumor; D004784:Environmental Monitoring / Q000379:methods*; D006801:Humans; D009499:Neutral Red / Q000737:chemistry; D045483:Rivers / Q000737:chemistry*; D013778:Tetrazolium Salts / Q000737:chemistry; D013844:Thiazoles / Q000737:chemistry; D018675:Toxicity Tests; D060753:Water Quality
D013778:Tetrazolium Salts; D013844:Thiazoles; D009499:Neutral Red; C022616:thiazolyl blue