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
Goldspink, DF
中科院分区:
医学3区
文献类型:
--
作者:
Burniston, JG;Clark, WA;Tan, LB;Goldspink, DF

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响应大剂量的肌肉生长(即,mg.kg-1)的β2-肾上腺素能受体激动剂。然而,这些剂量也可能诱导心脏和骨骼肌中的肌细胞死亡,因此可能不是适用于人类的安全剂量。在这里,我们报告了不同剂量的盐酸克伦特罗的肥大和肌毒作用。用盐酸克伦特罗(1 μg ~ 1 mg·kg ~(-1))灌胃大鼠14天。肌肉蛋白质含量,肌纤维横截面积和肌细胞死亡进行了研究。注入≥10 μg·kg-1·d-1的克伦特罗显著(P<0.05)增加心脏(12- 15%)、比目鱼肌(12%)、跖肌(18- 29%)和胫骨前肌(11- 22%)的蛋白质含量,同时伴有肌纤维肥大。大剂量(100 μg或1 mg)可引起比目鱼肌(峰值0.2 ± 0.1%凋亡)、膈肌(峰值0.15 ± 0.1%凋亡)和跖肌(峰值0.3 ± 0.05%坏死)的显著(P<0.05)心肌细胞死亡,并显著(P<0.05)增加心肌胶原面积分数。这些数据表明,10 μg.kg-1. d-1的低剂量可用于研究在没有心肌细胞死亡的情况下克仑特罗的合成代谢作用。
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.
DOI: 10.1002/mus.20407
发表时间: 2005-12
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