Abstract
There have recently been increasing experimental and clinical evidences suggesting that hypothalamic dysregulation may be one of the underlying mechanisms of abnormal glucose metabolism. First, increased hypothalamic-pituitary-adrenal axis activity induced by uncontrollable excess stress may cause diabetes mellitus as well as dyslipidemia, visceral obesity, and osteoporosis with some resemblance to Cushing's disease. Second, several molecules are known to be expressed both in pancreas and hypothalamus; adenosine triphosphate-sensitive potassium channels, malonyl-CoA, glucokinase, and AMP-activated protein kinase. Those molecules appear to form an integrated hypothalamic system, which may sense hypothalamic fuel status, especially glucose level, and inhibit action of insulin on hepatic gluconeogenesis, thereby forming a brain-liver circuit. Third, hypothalamic resistance to insulin as an adiposity signal may be involved in pathogenesis of peripheral insulin resistance. The results with mice with a neuron-specific disruption of the insulin receptor gene or those lacking insulin receptor substrate 2 in hypothalamus supported this possibility. Finally, it has very recently been suggested that dysregulation of clock genes in hypotha...Continue Reading
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