Objective To find a sensitive cytotoxic response to reflect the bio-toxicity of trace organic pollutants,the sensitivity and reliability of morphological change and proliferation inhibition of Vero cells exposed to 2,4,6-trichlorophenol(TCP) and the leachate from products related to drinking water(PRDW) were compared,and the mechanism of the morphological change in Vero cells exposed to chemical pollutants was studied.Methods Vero cells were treated by different concentration of TCP and the leachate from PRDW.Methylthiazol-2-yl-2,5-diphenyl tetrazolium bromide(MTT) assay was carried out for proliferation inhibition.Bioluminescence method was carried out as another method to test the toxicity of TCP.Flow Cytornetry assay was used to test cell Apoptosis and damage of cell-membrane.Results 0.25 mg/L TCP had an effect on cell morphology,and the proportion of morphologically changed cells increased with increasing TCP concentration.At low TCP concentrations,inhibition of cell proliferation did not seem to correlate to TCP concentration,and was negative when TCP concentration was<1.0 mg/L.After exposure to leachate from PRDW extracted at different temperatures,the percentage of morphologically changed cells increased with extracting temperature,but the inhibition of cell proliferation failed to reflect the correlation between extracting temperature and proliferation inhibition of Vero cells.Although the Sensitivity of bioluminescence method seems to be similar to morphological change in Vero cells,the bacterial in this method is not homologous enough with human body cells to reflect the toxicity to human body.These imply cell morphological change is a more sensitive and reliable method to reflect bio-toxicity of organic pollutants than proliferation inhibition.Flow cytometry analysis and cell rejuvenation experiments indicated cell membrane damage,which results in cell morphological change,was an early and sensitive cytotoxic response comparing with necrosis.Conclusion These results indicated that the cell membrane tox
TING-TING LIAO YAN-LING SHI JIAN-WEI JIA AND LEI WANG
