Glucagon Signal‐Transduction Mechanisms

Exton, John H.

doi:10.1002/cphy.cp070213

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“…The resultant increase of hepatic cyclic adenosine monophosphate levels activates protein kinase A, which, in turn, phosphorylates the enzymes needed to activate liver glycogenolysis. 23…”

Section: Liver Actionmentioning

confidence: 99%

The Physiology of Glucagon

Taborsky

2010

J Diabetes Sci Technol

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This short review outlines the physiology of glucagon in vivo, with an emphasis on its neural control, the author's area of interest. Glucagon is secreted from alpha cells, which are a minority of the pancreatic islet. Anatomically, they are down stream from the majority islet beta cells. Beta-cell secretory products restrain glucagon secretion. Activation of the autonomic nerves, which innervate the islet, increases glucagon secretion. Glucagon is secreted into the portal vein and thus has its major physiologic action at the liver to break down glycogen. Glucagon thereby maintains hepatic glucose production during fasting and increases hepatic glucose production during stress, including the clinically important stress of hypoglycemia. Three different mechanisms proposed to stimulate glucagon secreted during hypoglycemia are discussed: (1) a stimulatory effect of low glucose directly on the alpha cell, (2) withdrawal of an inhibitory effect of adjacent beta cells, and (3) a stimulatory effect of autonomic activation. In type 1 diabetes (T1DM), increased glucagon secretion contributes to the elevated ketones and acidosis present in diabetic ketoacidosis (DKA). It also contributes to the hyperglycemia seen with or without DKA. The glucagon response to insulin-induced hypoglycemia is impaired soon after the development of T1DM. The mediators of this impairment include loss of beta cells and loss of sympathetic nerves from the autoimmune diabetic islet.

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“…The resultant increase of hepatic cyclic adenosine monophosphate levels activates protein kinase A, which, in turn, phosphorylates the enzymes needed to activate liver glycogenolysis. 23…”

Section: Liver Actionmentioning

confidence: 99%

The Physiology of Glucagon

Taborsky

2010

J Diabetes Sci Technol

View full text Add to dashboard Cite

show abstract

Glucagon Signal‐Transduction Mechanisms

Abstract: The sections in this article are: Glucagon Receptor Regulation of G s Regulation of Adenylate Cyclase Regulation of cAmp‐Dependent Protein Kinase Substrates of cAmp‐Dependent Protein Kinase Mechanisms of Calcium Mobilization Induced by Glucagon S… Show more

Cited by 1 publication

References 185 publications

The Physiology of Glucagon

The Physiology of Glucagon

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