Document Detail

In vitro studies of sodium transport across the lower intestine of a desert parrot.
MedLine Citation:
PMID:  7435600     Owner:  NLM     Status:  MEDLINE    
The lower intestine (coprodeum and colon) of the Australian parrot, the galah, was mounted in Ussing chambers. Short-circuit current (SCC), electrical potential difference (PD), and unidirectional fluxes of Na and Cl were measured in birds that were fed mixed seeds or were NaCl loaded. The net Na transport of both coprodeum and colon was nearly equal to the SCC, and the flux ratio for Cl was unity. In birds which received mixed seeds, average coprodeal Na transport was 7.8 mu eq . cm-2 . h-1, and PD was 19 mV. The Km for Na was 5.7 meq/l. In colon, Na transport was reduced by 67% and PD by 70%. The ratio between unidirectional Na and Cl fluxes in the serosa-mucosa direction was 0.7. Salt loading suppressed coprodeal, but increased colonic Na transport. The coprodeal and colonic SCC and NA transport of birds receiving mixed seeds were inhibited by amiloride on the mucosal side. Colonic SCC of NaCl-loaded birds was only slightly reduced by amiloride (by 17%), but stimulated by amino acids (by 18%).
E Skadhauge; T J Dawson
Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of physiology     Volume:  239     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1980 Sep 
Date Detail:
Created Date:  1981-01-26     Completed Date:  1981-01-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  R285-90     Citation Subset:  IM    
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MeSH Terms
Amiloride / pharmacology
Biological Transport, Active / drug effects
Chlorides / metabolism
Colon / metabolism*
Dehydration / metabolism
Intestine, Large / metabolism*
Parrots / metabolism*
Psittaciformes / metabolism*
Sodium / metabolism*
Sodium Chloride / administration & dosage
Reg. No./Substance:
0/Chlorides; 2609-46-3/Amiloride; 7440-23-5/Sodium; 7647-14-5/Sodium Chloride

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

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