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Life Sci. 1996;58(14):1171-7.

Chronic effect of hyperprolactinemia on blood glucose and lipid levels in mice.

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Department of Biological Sciences, Graduate School of Science, University of Tokyo, Japan.


We studied the chronic effects of hyperprolactinemia, induced by ectopic pituitary grafting, on blood glucose and lipid levels in adult male mice. For one year after pituitary grafting, we measured the blood levels of prolactin, growth hormone (GH), insulin, glucose and free fatty acid (FFA) at various intervals. The graft caused consistent hyperprolactinemia without changes in the serum GH levels. Hypoglycemia developed at 1 and 3 months after grafting but was not accompanied by any changes of the serum insulin levels. Thereafter, the blood glucose and serum insulin levels began to increase in the pituitary-grafted (PG) mice, and at 12 months after the operation, both levels became significantly higher in PG mice than controls. The serum FFA levels and the weight of epididymal fat bodies were significantly lower in PG mice than controls from 3-12 months after the grafting. Thus, hyperprolactinemia leads to persistent hypolipidemia and biphasic changes in the blood glucose level.

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