Abstract
DNA synthesis, cholesterogenesis and the enzymes of the hexosemonophosphate (HMP) shunt pathway were investigated in liver of diabetic rats treated with insulin and in fasted/re-fed rats. Both insulin and refeeding were found to induce liver cell proliferation, accompanied by a remarkable increase in cholesterogenesis. An enhancement of glucose-6-phosphate dehydrogenase (G6PD) and 6-phosphogluconate dehydrogenase (G6PD) activities was also found in insulin-treated diabetic rats and in re-fed rats, supporting the concept that these two enzymes are involved in the proliferative process. Since insulin did not exert the same biochemical effects in a non replicating cell population, such as in insulin-treated normal rats, these studies provide new evidence of a close correlation between DNA, cholesterol synthesis and HMP shunt enzymes during cell proliferation.
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