Document Detail

Exercise-induced changes in plasma composition increase erythrocyte Na+,K+-ATPase, but not Na+-K+-2Cl- cotransporter, activity to stimulate net and unidirectional K+ transport in humans.
MedLine Citation:
PMID:  14528028     Owner:  NLM     Status:  MEDLINE    
We tested the hypothesis that exercise-induced changes in plasma composition result in peak stimulation of erythrocyte unidirectional K+ (JK,in) and net K+ (JK,net) transport within the first 120 s. In experimental series 1 (7 men; 2 women), plasma [K+] was continuously measured in vitro (37 degrees C) after the addition of red blood cells (RBCs) obtained from rested subjects (resting RBCs) into an exercise-simulated plasma (ESP; increased plasma osmolality, [K+], [H+], [lactate] and [adrenaline] (epinephrine)), and JK,net calculated. In experimental series 2 (7 men; 4 women), resting RBCs were incubated in true exercise plasma (TEP) obtained after two 30 s bouts of high intensity leg cycling exercise to determine JK,net and JK,in (via RBC 86Rb accumulation). JK,net of resting RBCs increased from 0.9 +/- 28.7 in resting plasma to 285 +/- 164 mmol (l RBCs)-1 h-1 in ESP and to 178 +/- 60 mmol (l RBCs)-1 h-1 after 10 s in TEP. Both JK,net and JK,in peaked within 10 s of incubation and decreased rapidly during the initial 120 s. The use of inhibitors for the Na+,K+-ATPase (ouabain) and the Na+-K+-2Cl- cotransporter (NKCC; bumetanide) indicated that rapid increases in JK,in and JK,net upon incubation of resting RBCs in TEP were due primarily to increased Na+,K+-ATPase activity; the NKCC appeared to be involved only when the Na+,K+-ATPase was blocked. It is concluded that RBCs rapidly increase JK,in and JK,net in response to exercise-induced changes in plasma composition.
Michael I Lindinger; Simon P Grudzien
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2003-10-03
Journal Detail:
Title:  The Journal of physiology     Volume:  553     ISSN:  0022-3751     ISO Abbreviation:  J. Physiol. (Lond.)     Publication Date:  2003 Dec 
Date Detail:
Created Date:  2003-12-15     Completed Date:  2004-08-31     Revised Date:  2013-06-09    
Medline Journal Info:
Nlm Unique ID:  0266262     Medline TA:  J Physiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  987-97     Citation Subset:  IM    
Department of Human Biology and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada, N1G 2W1.
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MeSH Terms
Body Weight
Bumetanide / pharmacology
Erythrocytes / drug effects,  metabolism*
Exercise / physiology*
Ouabain / pharmacology
Potassium / blood*
Sodium-Potassium-Chloride Symporters / blood*
Sodium-Potassium-Exchanging ATPase / metabolism*
Reg. No./Substance:
0/Sodium-Potassium-Chloride Symporters; 28395-03-1/Bumetanide; 630-60-4/Ouabain; 7440-09-7/Potassium; EC ATPase

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