Co-Administration Exposure Toxicity of Isoniazid and Rifampicin in Chang Liver Cell Lines
Abstract
The study is designed to investigate the exposure toxicity of isoniazid (INH) and rifampicin (RIF) in combination on Chang liver cell lines. Each 50, 100, and 200 ng/ml of INH and RIF were co-administered to the Chang cell lines for a period of 24 hours; the untreated cell lines were served as a control. Alanine aminotransferase (ALT), Aspartate aminotransferase (AST) and alkaline phosphatase (ALP) activity in the culture medium were assayed to determine the integrity of the cell lines. β-Galactosidase and cathepsin activities were also assayed in the lysosomal fraction. A comet assay was performed to determine DNA damage in the cell lines. The mRNA expressions of CYP2E1, BAX, BCL2, P53, and caspase-3 were studied. Cells treated with INH and RIF showed abnormal levels of ALP, AST, and ALT activities in the culture medium. However, no such abnormalities were inferred in the medium of the unexposed control cells. Altered enzymatic activities were seen in the lysosomal fractions of the treated cells, whereas no such abnormalities were detected in the untreated control cell lines. 71% of DNA damage was recorded in the intoxicated cells, whereas the DNA of the control cell lines remained intact. A significant increase in the CYP2E1, P53, and caspase-3, along with alterations in BAX and BCL2 mRNA expressions, was recorded in the intoxicated cells. In contrast, the untreated control cells showed optimal mRNA expression. This study demonstrated that exposure to INH and RIF in Chang liver cell lines compromised cellular integrity, altered the mRNA expression, and induced significant DNA damage.
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