| The hydroosmotic response of frog urinary bladder to serosal hypertonicity is dependent on adenylate cyclase for its maintenance and affected by [Cl-]o changes. | |
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MedLine Citation:
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PMID: 16455767 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The role of adenylate cyclase (AC) in the maintenance of the hydroosmotic response to serosal hypertonicity (SH) in anuran urinary bladder is disputed. In this study, norepinephrine (NE) significantly reversed the hydroosmotic response of Rana temporaria bladders in hypertonic medium (330 mosmol/kgH2O). The reversal was inhibited by yohimbine but was unaffected by prazosin and propranolol, indicating that NE action was mediated via alpha2-adrenergic receptors. Preincubation of bladders with indomethacin did not interfere with the inhibitory action of NE, contraindicating a role for prostaglandins. The SH hydroosmotic response was abolished in the presence of 5-n-ethyl-N-isopropyl amiloride (EIPA), but the antidiuretic hormone (ADH) hydroosmotic response was not. EIPA inhibits Na+/H+, known to be activated by cell shrinkage. An investigation of the anionic requirement of the SH hydroosmotic response revealed that replacement of bath Cl- with the nonpermeable anion gluconate reversibly abolished this response. In contrast, the hydroosmotic response to ADH was unaffected by Cl- removal; however, when Cl- was absent, it was no longer augmented in hypertonic bath. The SH response was inhibited by the Cl- channel blocker 5-nitro-2-(3-phenylpropylamino)benzoate but not by the Na/K/2Cl inhibitor bumetanide. Our results show that not only the onset but also the maintenance of the SH hydroosmotic response is dependent on AC activity and does not differ in this respect to the ADH hydroosmotic response. The effect of modifying extracellular Cl- concentration, suggests that this anion, possibly functionally linked with Na+/H+ activity, may be involved in invoking the SH hydroosmotic response in anuran urinary bladder. |
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Authors:
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Ann T Hanna-Mitchell; Elizabeth M Gebruers |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2006-02-02 |
Journal Detail:
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Title: American journal of physiology. Regulatory, integrative and comparative physiology Volume: 291 ISSN: 0363-6119 ISO Abbreviation: Am. J. Physiol. Regul. Integr. Comp. Physiol. Publication Date: 2006 Jul |
Date Detail:
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Created Date: 2006-06-08 Completed Date: 2006-07-26 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 100901230 Medline TA: Am J Physiol Regul Integr Comp Physiol Country: United States |
Other Details:
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Languages: eng Pagination: R213-23 Citation Subset: IM |
Affiliation:
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Department of Physiology, University College Cork, Cork, Ireland. ahannam@pitt.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adenylate Cyclase
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metabolism* Animals Anura / metabolism* Biological Transport Chloride Channels / metabolism Chlorides / metabolism* Epithelium / metabolism Male Norepinephrine / pharmacology Osmolar Concentration Prostaglandins / metabolism Serous Membrane / metabolism* Urinary Bladder / anatomy & histology, drug effects, enzymology* Vasopressins |
| Chemical | |
Reg. No./Substance:
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0/Chloride Channels; 0/Chlorides; 0/Prostaglandins; 11000-17-2/Vasopressins; 51-41-2/Norepinephrine; EC 4.6.1.1/Adenylate Cyclase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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