| Catecholamine effects on cyclic AMP levels and ion secretion in rabbit ileal mucosa. | |
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MedLine Citation:
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PMID: 238408 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Effects of catecholamines on cyclic AMP (cAMP) levels and ion fluxes were examined in isolated rabbit ileal mucosa. The base-line cAMP level was unaffected by epinephrine (Epi), norepinephrine (Norepi), and isoproterenol. The theophylline-augmented cAMP level was decreased slightly be Epi in one series of experiments but not in another. Propranolol did not enhance this effect. The increase in cAMP level produced by cholera toxin was almost completely reversed by addition of Epi or Norepi. This reversal was prevented by phenoxybenzamine. Epi also partially reversed the increase in cAMP level produced by prostaglandin E1. Effects of Epi on ion fluxes were determined following addition of secretagogues. Epi significantly decreased theophylline-induced but not cAMP or cholera toxin-induced Cl secretion. A decrease in short-circuit current was nonetheless observed in the latter two instances. The observed discrepancies between alpha-adrenergic effects on cAMP levels and ion fluxes suggest the following possibilities: 1) ion transport-related cAMP is only a small fraction of total mucosal cAMP; 2) cAMP-induced active ion secretion is only slowly reversible, or 3) effects of alpha-adrenergic stimuli on ion transport are not due to inhibition of cAMP accumulation. |
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Authors:
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M Field; H E Sheerin; A Henderson; P L Smith |
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Publication Detail:
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Type: In Vitro; Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: The American journal of physiology Volume: 229 ISSN: 0002-9513 ISO Abbreviation: Am. J. Physiol. Publication Date: 1975 Jul |
Date Detail:
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Created Date: 1975-10-11 Completed Date: 1975-10-11 Revised Date: 2009-10-27 |
Medline Journal Info:
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Nlm Unique ID: 0370511 Medline TA: Am J Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 86-92 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adrenergic alpha-Agonists
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pharmacology Animals Bicarbonates / metabolism Biological Transport Catecholamines / pharmacology* Chlorides / metabolism* Cholera Cyclic AMP / metabolism* Dose-Response Relationship, Drug Electric Conductivity Ileum / metabolism* Intestinal Mucosa / metabolism* Male Phenoxybenzamine / pharmacology Phentolamine / pharmacology Propranolol / pharmacology Prostaglandins E / antagonists & inhibitors, pharmacology Rabbits Receptors, Adrenergic Sodium / metabolism* Theophylline / pharmacology Toxins, Biological / pharmacology |
| Chemical | |
Reg. No./Substance:
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0/Adrenergic alpha-Agonists; 0/Bicarbonates; 0/Catecholamines; 0/Chlorides; 0/Prostaglandins E; 0/Receptors, Adrenergic; 0/Toxins, Biological; 50-60-2/Phentolamine; 525-66-6/Propranolol; 58-55-9/Theophylline; 59-96-1/Phenoxybenzamine; 60-92-4/Cyclic AMP; 7440-23-5/Sodium |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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