Document Detail

Isoproterenol potentiates exercise-induction of Hsp70 in cardiac and skeletal muscle.
MedLine Citation:
PMID:  10547069     Owner:  NLM     Status:  MEDLINE    
The response to exercise stress is characterized by an increase in circulating catecholamines and rapid synthesis of the inducible member of the 70 kDa family of heat shock proteins (Hsp70). Cell culture studies indicate that Hsp70 expression is influenced by beta-adrenergic receptor intermediates including cyclic AMP (cAMP) and cAMP dependent protein kinase (PKA). Thus, in the present investigation, the effect of a beta-adrenergic agonist, isoproterenol (ISO; 10 mg/kg) and a beta-adrenergic antagonist, nadolol (NAD; 25 mg/kg), on the in vivo expression of Hsp70 in rodent cardiac and skeletal muscle following moderate (MOD; 17 m/min) and exhaustive (EXH; 30 m/min) exercise was examined. While ISO alone did not induce Hsp70 synthesis, ISO treatment potentiated Hsp70 expression following MOD in the white vastus and heart (395+/-29 and 483+/-29% greater than control respectively, P < 0.05). Furthermore, this effect was reversed with combined beta-adrenergic agonist and antagonist treatment (ISO+NAD) indicating that the isoproterenol induced increase in post-exercise Hsp70 expression was mediated via beta-adrenergic receptor activity. However, there were no differences in Hsp70 levels among treatment groups following EXH. The failure of NAD to attenuate Hsp70 accumulation following EXH suggests that beta-adrenergic receptor activity is not the main signal in the induction of Hsp70 following exercise. Hsp70 induction was dependent on exercise intensity and ISO administration prior to MOD resulted in Hsp70 levels similar to those observed following EXH. The results from the present investigation indicate that beta-adrenergic receptor stimulation does not induce Hsp70 synthesis per se, but may be one factor involved in the complex regulation of the stress response to exercise in vivo.
Z Paroo; E G Noble
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Cell stress & chaperones     Volume:  4     ISSN:  1355-8145     ISO Abbreviation:  Cell Stress Chaperones     Publication Date:  1999 Sep 
Date Detail:
Created Date:  1999-11-16     Completed Date:  1999-11-16     Revised Date:  2008-11-20    
Medline Journal Info:
Nlm Unique ID:  9610925     Medline TA:  Cell Stress Chaperones     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  199-204     Citation Subset:  IM; S    
School of Kinesiology, Faculty of Health Sciences, The University of Western Ontario, London, Canada.
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MeSH Terms
Adrenergic beta-Agonists / pharmacology*
HSP70 Heat-Shock Proteins / biosynthesis*
Heart / physiology*
Isoproterenol / pharmacology*
Muscle, Skeletal / physiology*
Physical Conditioning, Animal
Rats, Sprague-Dawley
Receptors, Adrenergic, beta / physiology
Reg. No./Substance:
0/Adrenergic beta-Agonists; 0/HSP70 Heat-Shock Proteins; 0/Receptors, Adrenergic, beta; 7683-59-2/Isoproterenol

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