| Effect of hypotonicity on cyclic adenosine monophosphate formation and action in vasopressin target cells. | |
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MedLine Citation:
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PMID: 164579 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We have shown previously that overhydration of toads renders their urinary bladders less responsive to the antidiuretic action of vasopressin (AVP). The present study investigates the relationship between osmotic swelling of vasopressin target cells and their sensitivity to AVP and dibutyryl cyclic adenosine monophosphate (db-cAMP). Conditions which engender osmotic swelling of toad bladder epithelial cells, such as immersing bladders on both surfaces in hypotonic Ringer's fluid or subjecting them to a net mucosal-to-serosal volume flux, markedly inhibited the effectiveness of db-cAMP in raising bladder permeability to water. This inhibitory phenomenon was seen both with serosal and mucosal applications of the nucleotide. Examination of isolated epithelial cells by phase contrast microscopy showed them to behave as osmometers, doubling their volume as the effective osmolality of the incubation medium was halved. AVP was found to increase the total content of cAMP about 3.5-fold both in the swollen and the normal cells, so that the actual concentration of cAMP may have diminished as the cell volume increased. Consistent with this suggestion was the observation that increasing exogenous db-cAMP abolished, in part, the inhibitory effects of hypotonicity. These observations indicate that homeostasis of body fluids in the toad depends in part upon the osmotic regulation of anti-diuretic homone action, and that intracellular cAMP may participate in coupling changes in cell volume to the altered state of responsiveness of the vasopressin target cell. |
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Authors:
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P Eggena; J Christakis; L Deppisch |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Kidney international Volume: 7 ISSN: 0085-2538 ISO Abbreviation: Kidney Int. Publication Date: 1975 Mar |
Date Detail:
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Created Date: 1975-07-03 Completed Date: 1975-07-03 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0323470 Medline TA: Kidney Int Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 161-9 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Body Fluids / metabolism* Bufo marinus Cell Membrane Permeability / drug effects Cyclic AMP / analysis, metabolism* Female Homeostasis Hypotonic Solutions Immersion Microscopy, Phase-Contrast Osmolar Concentration Urinary Bladder / analysis, cytology, drug effects* Vasopressins / pharmacology* Water-Electrolyte Balance |
| Chemical | |
Reg. No./Substance:
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0/Hypotonic Solutions; 11000-17-2/Vasopressins; 60-92-4/Cyclic AMP |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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