Document Detail

Osmoregulatory physiology of pyloric ceca: regulated and adaptive changes in chinook salmon.
MedLine Citation:
PMID:  15945075     Owner:  NLM     Status:  MEDLINE    
Functions of the anatomically obvious, yet peculiar, pyloric ceca of the fish gut have been a source of conjecture for over two millennia since Aristotle hypothesized on digestive utilities. Here, we demonstrate regulated and adaptive changes in osmoregulatory physiology of ceca from chinook salmon (Onchorhynchus tshawytscha). Transfer of salmon from freshwater to seawater (both short- and long-term) significantly stimulated both fluid uptake from 5.1 to 8.3-9.3 microl/cm2/hr and also Na+/K+ -ATPase from 6.5 to 8.3-9.6 micromol/ADP/mg protein/hr. Similar changes were induced with implants of cortisol, which resulted in high physiological cortisol levels in plasma. Ceca, which can number about 200 in chinook salmon, were estimated to account for the majority of fluid uptake capacity of the intestine and, after long-term seawater adaptation, the proportion of uptake capacity was sixfold higher. Transport physiology of ceca is thus under environmental and endocrine control indicative of an important role in salt and water homeostasis.
Philip A Veillette; Ronald J White; Jennifer L Specker; Graham Young
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of experimental zoology. Part A, Comparative experimental biology     Volume:  303     ISSN:  1548-8969     ISO Abbreviation:  J. Exp. Zoolog. Part A Comp. Exp. Biol.     Publication Date:  2005 Jul 
Date Detail:
Created Date:  2005-06-27     Completed Date:  2005-08-08     Revised Date:  2009-10-05    
Medline Journal Info:
Nlm Unique ID:  101168223     Medline TA:  J Exp Zool A Comp Exp Biol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  608-13     Citation Subset:  IM    
Department of Zoology, University of Otago, Dunedin, New Zealand.
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MeSH Terms
Acclimatization / physiology*
Analysis of Variance
Animal Structures / anatomy & histology,  drug effects,  physiology*
Body Fluids / metabolism
Fresh Water
Hydrocortisone / blood,  pharmacology
Pylorus / anatomy & histology*
Salmon / physiology*
Sodium-Potassium-Exchanging ATPase / metabolism*
Water-Electrolyte Balance / physiology*
Reg. No./Substance:
50-23-7/Hydrocortisone; 630-60-4/Ouabain; EC ATPase

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

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