Dose-dependent separation of the hypertrophic and myotoxic effects of the beta(2)-adrenergic receptor agonist clenbuterol in rat striated muscles.
Dose-dependent separation of the hypertrophic and myotoxic effects of the beta(2)-adrenergic receptor agonist clenbuterol in rat striated muscles.
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DOI:
10.1002/mus.20504
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发表时间:
2006-05
期刊:
影响因子:
3.4
通讯作者:
Goldspink, DF
中科院分区:
文献类型:
--
作者:
Burniston, JG;Clark, WA;Tan, LB;Goldspink, DF
Muscle growth in response to large doses (i.e., mg.kg-1) of β2-adrenergic receptor agonists has been consistently reported. However, such doses may also induce myocyte death in the heart and skeletal muscles and hence may not be applicable safe doses for humans. Here, we report the hypertrophic and myotoxic effects of different doses of clenbuterol. Rats were infused with clenbuterol (range, 1 μg to 1 mg.kg-1) for 14 days. Muscle protein content, myofiber cross-sectional area and myocyte death were then investigated. Infusions of ≥10 μg.kg-1.d-1 of clenbuterol significantly (P<0.05) increased the protein content of the heart (12-15 %), soleus (12 %), plantaris (18-29 %), and tibialis anterior (11-22 %) muscles, with concomitant myofiber hypertrophy. Larger doses (100 μg or 1 mg) induced significant (P<0.05) myocyte death in the soleus (peak 0.2 ± 0.1 % apoptosis), diaphragm (peak 0.15 ± 0.1 % apoptosis) and plantaris (peak 0.3 ± 0.05 % necrosis), and significantly (P<0.05) increased the area fraction of collagen in the myocardium. These data show that the low dose of 10 μg.kg-1.d-1 can be used to investigate the anabolic effects of clenbuterol in the absence of myocyte death.
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影响因子:
3.4
作者:
Burniston JG;Chester N;Clark WA;Tan LB;Goldspink DF
通讯作者:
Goldspink DF
影响因子:
6
作者:
Duncan, ND;Williams, DA;Lynch, GS
通讯作者:
Lynch, GS
影响因子:
2.7
作者:
Goldspink, DF;Burniston, JG;Tan, LB
通讯作者:
Tan, LB
影响因子:
3.3
作者:
Ingalls, CP;Barnes, WS;Smith, SB
通讯作者:
Smith, SB
影响因子:
3.4
作者:
MALTIN, CA;DELDAY, MI;BAILLIE, AGS
通讯作者:
BAILLIE, AGS