PMID: 16641871Apr 28, 2006Paper

Differences in cytochrome P450 2C19 (CYP2C19) expression in adjacent normal and tumor tissues in Chinese cancer patients

Medical Science Monitor : International Medical Journal of Experimental and Clinical Research
Minliang WuXiaohong Wu

Abstract

Cytochrome P450 2C19 (CYP2C19) exhibits polymorphic expression in humans and deficiencies in its expression have been associated with a number of different cancers. Our aim was to determine if CYP2C19 mRNA and CYP2C19 enzyme protein expression differed between various tumors and normal tissue adjacent to the tumor tissue in Han Chinese cancer patients. The level of CYP2C19 mRNA expression was examined in tumor and adjacent normal tissue from liver, colon, stomach, breast, esophagus, lung, uterus, brain, pancreas, ovary, kidney, and several cell lines by semi-quantitative RT-PCR Western immunoblots were also used to qualitatively assess CYP2C19 protein in the above tissues and cell lines. CYP2C19 mRNA was found only in normal livers, hepatic carcinomas, and hepatocarcinoma cell lines. The CYP2C19 mRNA was expressed at significantly higher levels in hepatocellular carcinomas (x +/- s: 3.72 +/- 1.21, n = 14) than in adjacent normal liver tissue (x +/- s: 1.79 +/- 0.33, n = 14, p = 0.000). CYP2C19 protein was also detected in hepatocarcinoma tissues, adjacent normal tissues, and the hepatocarcinoma cell lines HepG2, HepGA, and 7721 based on Western blotting methods. These results are in accordance with observations employing RT-PCR...Continue Reading

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