A New Paradigm for Diabetes and Obesity: the Hepatic Insulin Sensitizing Substance (HISS) Hypothesis

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  • Lautt W. Wayne
    Department of Pharmacology & Therapeutics, Faculty of Medicine, University of Manitoba

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  • New Paradigm for Diabetes and Obesity the Hepatic Insulin Sensitizing Substance HISS Hypothesis

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The glucose disposal effect of insulin after a meal is accounted for in approximately equal measure by the direct action of insulin and the action of HISS (hepatic insulin sensitizing substance) released from the liver and acting on skeletal muscle to stimulate glucose storage as glycogen. The ability of insulin to cause HISS release is determined by hepatic parasympathetic nerves. Eliminating the parasympathetic signal by surgical denervation of the liver or by blockade of hepatic muscarinic receptors, hepatic nitric oxide synthase, or hepatic cyclooxygenase results in insulin resistance that can be accounted for by the absence of HISS action and is referred to as HISS-dependent insulin resistance (HDIR). Animal models in which the insulin resistance has been shown to be HDIR includes the spontaneously hypertensive rat, sucrose fed rats, animals with liver disease, adult offspring of fetal alcohol exposure, acute stress, and ageing. We suggest that HDIR accounts for the major metabolic disturbances in type 2 diabetes, including the postprandial hyperglycemia that results in the majority of pathologies related to diabetes. The observation of meal-induced insulin sensitization (MIS) and the role of HISS allows for consideration of a new paradigm relating meal processing, diabetes, obesity, and insulin resistance. New diagnostic approaches and therapeutic targets are described.<br>

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