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  • Title: Sex steroids enhance insulin receptors and glucose oxidation in Chang liver cells.
    Author: Parthasarathy C, Renuka VN, Balasubramanian K.
    Journal: Clin Chim Acta; 2009 Jan; 399(1-2):49-53. PubMed ID: 18834871.
    Abstract:
    BACKGROUND: The present study was designed to assess the effect of sex steroids (testosterone and 17beta-estradiol) on insulin receptor expression, insulin binding and glucose oxidation in human liver cell line. METHODS: Non-malignant Chang liver cells were treated with different concentrations of testosterone and 17beta-estradiol dissolved in serum free medium for 24 h to identify the effective dose of both steroids for further studies. Cells with 70-80% confluency were challenged with testosterone (0.1 micromol/l), 17beta-estradiol (0.1 micromol/l) and their combination along with insulin as a positive control for 24 h. After the treatment period, insulin receptor mRNA expression, cell surface insulin binding and (14)C-glucose oxidation were assessed. RESULTS: Both testosterone and 17beta-estradiol significantly increased the insulin receptor mRNA expression, cell surface insulin binding and (14)C-glucose oxidation compared to basal, but the increase was not at par with the effect of insulin. Compared to individual effects of testosterone and 17beta-estradiol, their combination significantly increased the glucose oxidation similar to that of insulin. CONCLUSION: It is concluded from the present study that testosterone and 17beta-estradiol can directly enhance insulin receptor mRNA expression, insulin binding and glucose oxidation in Chang liver cells and thereby glucose metabolism.
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