Document Detail


Corticotropin-releasing factor in the adrenal medulla.
MedLine Citation:
PMID:  3502062     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Immunoreactive and bioactive corticotropin-releasing factor has been identified in the adrenal gland of dogs, rats and humans. Radioimmunoassay and immunohistochemical experiments have clearly demonstrated that localization of the peptide is confined to the adrenal medulla. CRF-containing cells have a characteristic appearance and are often found in close association with blood vessels. Electron microscopic studies suggest that CRF is secreted at blood vessels within the adrenal medullary vasculature. CRF has also been identified in pheochromocytomas. The amount of the peptide made by such tumors is highly variable as the CRF content of pheochromocytomas may be 20 to 100 times higher or lower than that of normal adrenal tissue. The pathophysiological importance of CRF in pheochromocytomas is unknown. Excessive secretion of the peptide into the peripheral circulation may cause prolonged activation of the pituitary adrenal axis. The peptide may also act within the tumor, although its role remains obscure. Studies on chronically cannulated, awake dogs have shown that CRF is secreted into adrenal venous blood. A gradient exists between adrenal venous and peripheral arterial blood, as CRF is undetectable peripherally under resting conditions. Hemorrhage, a hemodynamic stimulus known to activate a sympathetic adrenal response, increases the CRF secretory rate. The time course of CRF secretion in response to this stimulus parallels that of epinephrine secretion. The physiological significance of adrenal medullary CRF remains to be determined. Although CRF has been shown to affect catecholamine secretion, the peptide appears to be only a weak secretagogue for catecholamines. We suggest that CRF may affect local blood flow within the adrenal medulla and may modify catecholamine secretory rates via this mechanism. The localization of CRF cells in close apposition to blood vessels supports this hypothesis.
Authors:
T O Bruhn; W C Engeland; E L Anthony; D S Gann; I M Jackson
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Annals of the New York Academy of Sciences     Volume:  512     ISSN:  0077-8923     ISO Abbreviation:  Ann. N. Y. Acad. Sci.     Publication Date:  1987  
Date Detail:
Created Date:  1988-04-13     Completed Date:  1988-04-13     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  7506858     Medline TA:  Ann N Y Acad Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  115-28     Citation Subset:  IM    
Affiliation:
Division of Endocrinology, Rhode Island Hospital/Brown University, Providence 02902.
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MeSH Terms
Descriptor/Qualifier:
Adrenal Gland Neoplasms / analysis
Adrenal Medulla / analysis*,  cytology,  metabolism
Animals
Chromatography, High Pressure Liquid
Corticotropin-Releasing Hormone / analysis*,  immunology,  secretion
Dogs
Female
Immunohistochemistry
Male
Pheochromocytoma / analysis
Chemical
Reg. No./Substance:
9015-71-8/Corticotropin-Releasing Hormone

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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