Document Detail

Respiratory and metabolic functions of carbonic anhydrase in exercised white muscle of trout.
MedLine Citation:
PMID:  9843866     Owner:  NLM     Status:  MEDLINE    
Electrical stimulation of a trout saline-perfused trunk preparation resulted in metabolic and respiratory responses comparable to those occurring after exhaustive exercise in vivo. Recovery of intracellular acid-base status and glycogen resynthesis were faster than in vivo. Intracellular carbonic anhydrase (ICF CA) blockade elevated intracellular PCO2 relative to untreated postexercise controls, whereas extracellular CA (ECF CA) blockade did not, in contrast to previous work with muscle at rest. ECF CA blockade had only a transient effect on postexercise CO2 and ammonia efflux. The relatively small pool of membrane-associated CA appears to be overwhelmed by exercise-induced CO2 production in muscle. Transmembrane ammonia efflux appears to shift from diffusion primarily as NH3 at rest, which is facilitated by ECF CA, to movement predominantly as NH+4 after exercise, which is independent of CA. The postponed recovery of intracellular pH caused by either or both ECF and ICF CA inhibition was consistent with reduced metabolic acid and lactate excretion from muscle. Creatine phosphate resynthesis was delayed by CA inhibition, whereas ATP replenishment was not affected. Delayed glycogen recovery indicates that HCO-3-dependent pathway(s) may be involved in glyconeogenesis.
Y Wang; R P Henry; P M Wright; G J Heigenhauser; C M Wood
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of physiology     Volume:  275     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1998 Dec 
Date Detail:
Created Date:  1999-02-01     Completed Date:  1999-02-01     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  R1766-79     Citation Subset:  IM    
Division of Marine Biology and Fisheries, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida 33149, USA.
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MeSH Terms
Acid-Base Equilibrium / physiology
Ammonia / metabolism
Carbonic Anhydrase Inhibitors / pharmacology
Carbonic Anhydrases / metabolism,  physiology*
Electrolytes / metabolism
Energy Metabolism / physiology
Glycolysis / physiology
Lactic Acid / metabolism
Motor Activity*
Muscle, Skeletal / enzymology*,  physiology*
Oncorhynchus mykiss / physiology*
Phosphates / metabolism
Respiratory Physiological Phenomena*
Reg. No./Substance:
0/Carbonic Anhydrase Inhibitors; 0/Electrolytes; 0/Phosphates; 50-21-5/Lactic Acid; 7664-41-7/Ammonia; EC Anhydrases

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

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