Document Detail


Adaptation to metabolic acidosis and its recovery are associated with changes in anion exchanger distribution and expression in the cortical collecting duct.
MedLine Citation:
PMID:  20592712     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
It is well known that acid/base disturbances modulate proton/bicarbonate transport in the cortical collecting duct. To study the adaptation further we measured the effect of three days of acidosis followed by the rapid recovery from this acidosis on the number and type of intercalated cells in the rabbit cortical collecting duct. Immunofluorescence was used to determine the expression of apical pendrin in β-intercalated cells and the basolateral anion exchanger (AE1) in α-intercalated cells. Acidosis resulted in decreased bicarbonate and increased proton secretion, which correlated with reduced pendrin expression and the number of pendrin-positive cells, as well as decreased pendrin mRNA and protein abundance in this nephron segment. There was a concomitant increase of basolateral AE1 and α-cell number. Intercalated cell proliferation did not seem to play a role in the adaptation to acidosis. Alkali loading for 6-20 h after acidosis doubled the bicarbonate secretory flux and reduced proton secretion. Pendrin and AE1 expression patterns returned to control levels, demonstrating that adaptive changes by intercalated cells are rapidly reversible. Thus, regulation of intercalated cell anion exchanger expression and distribution plays a key role in adaptation of the cortical collecting duct to perturbations of acid/base.
Authors:
Jeffrey M Purkerson; Shuichi Tsuruoka; D Zachary Suter; Aya Nakamori; George J Schwartz
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2010-06-30
Journal Detail:
Title:  Kidney international     Volume:  78     ISSN:  1523-1755     ISO Abbreviation:  Kidney Int.     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-10-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0323470     Medline TA:  Kidney Int     Country:  United States    
Other Details:
Languages:  eng     Pagination:  993-1005     Citation Subset:  IM    
Affiliation:
Department of Pediatrics, University of Rochester Medical Center, Rochester, New York, USA.
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MeSH Terms
Descriptor/Qualifier:
Grant Support
ID/Acronym/Agency:
DK-50603/DK/NIDDK NIH HHS
Comments/Corrections
Comment In:
Kidney Int. 2010 Nov;78(10):949-51   [PMID:  21030969 ]

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