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Characterisation of isoprenaline myotoxicity on slow-twitch skeletal versus cardiac muscle.

Abstract：

BACKGROUND:Elevated catecholamines are known to be cardiotoxic, but their potential injurious effects on skeletal muscles are largely unknown. We have investigated whether isoprenaline induces in vivo myocyte necrosis in rat soleus muscle, and characterised the time-course, dose-response, spatial distribution and adrenoceptor involvement of its myotoxicity, in comparison with effects on cardiomyocytes in the same animals. MATERIAL AND METHODS:Myocyte necrosis in response to subcutaneous isoprenaline was detected in vivo using a monoclonal anti-myosin antibody. Secondary immunoperoxidase staining (in vitro) facilitated the localisation of the damage and quantitative image analysis. RESULTS:Using this sensitive technique we report a novel observation that isoprenaline induces significant myocyte necrosis (5-10%) in the soleus muscle. This toxic damage was initiated at lower doses of isoprenaline than in the myocardium (1 vs. 10 microg kg(-1) s.c.), and peaked earlier (at 12 vs. 18 h post injection). Damage was distributed throughout the soleus muscle, whereas cardiomyocyte necrosis was most marked in left ventricular subendocardium where it was approximately 10 and three times greater than in the subepicardium and atria, respectively. Using selective adrenoceptor (AR) antagonism, we found that isoprenaline myotoxicity was mediated via beta(2)-AR in the soleus and via beta(1)-AR in the myocardium. CONCLUSION:The results show that the myopathic effects of isoprenaline are not confined to the heart. The involvement of skeletal muscle with different characteristics and mechanisms may have important implications in elucidating and treating the generalised myopathic processes seen in heart failure patients who have elevated levels of circulating catecholamines.

journal_name

Int J Cardiol

journal_title

International journal of cardiology

authors

Ng Y,Goldspink DF,Burniston JG,Clark WA,Colyer J,Tan LB

doi

10.1016/s0167-5273(02)00369-8

subject

Has Abstract

pub_date

2002-12-01 00:00:00

pages

299-309

issue

2-3

eissn

0167-5273

issn

1874-1754

pii

S0167527302003698

journal_volume

86

pub_type

杂志文章

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