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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Diabetes affects similarly the catalytic subunit and putative glucose-6-phosphate translocase of glucose-6-phosphatase.

The effect of streptozocin diabetes on the expression of the catalytic subunit ( p36) and the putative glucose-6-phosphate translocase (p46) of the glucose-6-phosphatase system (G6Pase) was investigated in rats. In addition to the documented effect of diabetes to increase p36 mRNA and protein in the liver and kidney, a approximately 2-fold increase in the mRNA abundance of p46 was found in liver, kidney, and intestine, and a similar increase was found in the p46 protein level in liver. In HepG2 cells, glucose caused a dose-dependent (1-25 mM) increase (up to 5-fold) in p36 and p46 mRNA and a lesser increase in p46 protein, whereas insulin (1 microM) suppressed p36 mRNA, reduced p46 mRNA level by half, and decreased p46 protein by about 33%. Cyclic AMP (100 microM) increased p36 and p46 mRNA by >2- and 1.5-fold, respectively, but not p46 protein. These data suggest that insulin deficiency and hyperglycemia might each be responsible for up-regulation of G6Pase in diabetes. It is concluded that enhanced hepatic glucose output in insulin-dependent diabetes probably involves dysregulation of both the catalytic subunit and the putative glucose-6-phosphate translocase of the liver G6Pase system.[1]


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