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Metabolic interactions of glucagon and cortisol in man—Studies with somatostatin
Abstract
The metabolic response to pathophysiologic concentrations of glucagon, induced by glucagon infusion, has been examined in normal man before and after 36-60 hr hypercortisolaemia, induced by administration of tetracosactrin-depot. Glucagon alone increased serum insulin levels twofold but blood glucose was unaltered. Plasma NEFA and blood ketone body concentrations were decreased by glucagon infusion. Tetracosactrin produced a threefold rise in serum cortisol levels and caused mild fasting hyperglycemia and hyperinsulinaemia. Subsequent glucagon infusion had no effect on circulating insulin, glucose, NEFA or ketone body concentrations. Simultaneous infusion of somatostatin, to produce partial insulin-deficiency, unmasked a hyperglycemic action of glucagon (+ 3.8 +/- 0.2 mmol/l at 90 min, p less than 0.02). This glucagon-induced rise in blood glucose was diminished by prior tetracosactrin administration. Tetracosactrin revealed a mild lipolytic action of glucagon in partial insulin deficiency, not apparent in the euadrenal state. Glucagon was equally hyperketonemic during somatostatin infusion before and after tetracosactrin. Thus the hyperglycemic and hyperketonemic actions of glucagon at pathophysiologic levels are restricted to insulin deficiency. Hypercortisolaemia reveals a lipolytic action of glucagon in insulin-deficient man but does not potentiate the hyperglycemic or hyperketonemic effects.
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Excess cortisol induces hepatic and extrahepatic insulin resistance and alters insulin action.
“Previous studies have demonstrated that excess cortisol induces hepatic and extrahepatic insulin resistance (3,18,20,28,41,42,48).”
From Impaired basal glucose effectiveness but unaltered fasting glucose release and gluconeogenesis during short-term hypercortisolemia in healthy subjects (2004) · cites this paper as [18]
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References 43 · Cited by 18
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Metadata
- Authors
- Gill, A., Johnston, D. G., Ørskov, H., Batstone, G. F., & Alberti, K. G. M. M.
- ORCID
- Johnston, D.G.
- Venue
- Metabolism
- Publisher
- Elsevier BV
- Published
- 1982-04
- Volume
- 31
- Issue
- 4
- Pages
- 305-311
- ISSN
- 0026-0495 (ISSN-L)
- OpenAlex
- W2166204541
- Cited by
- 18
- References
- 43
- Citations by year
- 2013: 2 · 2012: 1
- FWCI
- 3.87
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Metabolism (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Pancreatic function and diabetes
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adrenal Hormones and Disorders
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Growth Hormone and Insulin-like Growth Factors
- Keywords
- glucagon, cortisol, somatostatin, hypercortisolism, tetracosactrin, insulin deficiency, hyperglycemia, hyperketonemia, lipolysis, free fatty acids
- MeSH terms
- Adult, Blood Glucose, Cosyntropin, Drug Synergism, Fatty Acids, Nonesterified, Glucagon, Humans, Hydrocortisone, Insulin, Ketone Bodies, Male, Somatostatin
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