Administration of a creatine analogue induces isomyosin transitions in muscle.

Administration of a creatine analogue induces isomyosin transitions in muscle.
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肌酸类似物的施用会诱导肌肉中的异肌球蛋白转变。

DOI:
10.1152/ajpcell.1989.257.4.c810
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发表时间:
1989
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Kushmerick,MJ
Kushmerick,MJ
中科院分区:
--
文献类型:
--
作者:
Moerland,TS;Wolf,NG;Kushmerick,MJ

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在雄性CD-1小鼠的食物(2% wt/wt)和水(0.5% wt/vol)中给予肌酸类似物β-胍基丙酸(β-GPA)。摄取的磷酸化类似物和消耗的磷酸肌酸在后肢肌肉进行监测,31 P核磁共振,并发现在7周内完成。在此之后,比目鱼肌,趾长伸肌(EDL),心室的异肌球蛋白组成进行了分析,焦磷酸盐凝胶电泳。发现类似物诱导比目鱼肌和趾长伸肌中表达的肌球蛋白类型的显著改变。正常比目鱼肌含有中间(IM)和慢(SM)肌球蛋白,治疗减少了约50%的IM的相对含量。在EDL中,与对照组相比,治疗使快速异肌球蛋白FM 3降低了60%。十二烷基硫酸钠凝胶电泳也显示小清蛋白在EDL中减少约50%。给药对心室肌的异肌球蛋白组成无明显影响。治疗组小鼠的体力活动水平和血清葡萄糖和甲状腺素浓度与对照组无显著差异。这些结果表明细胞内能量学在介导成熟动物肌肉表型的适应性变化中的作用。
A creatine analogue, beta-guanidinopropionic acid (beta-GPA), was administered in the food (2% wt/wt) and the water (0.5% wt/vol) of male CD-1 mice. Uptake of the phosphorylated analogue and depletion of phosphocreatine in hindlimb muscle was monitored by 31P nuclear magnetic resonance and was found to be complete within 7 wk. After this time, the isomyosin composition of soleus, extensor digitorum longus (EDL), and ventricle was analyzed by pyrophosphate gel electrophoresis. The analogue was found to induce significant alterations in the type of myosin expressed in soleus and EDL. Normal soleus contains both intermediate (IM) and slow (SM) myosins, and treatment reduced the relative content of IM by approximately 50%. In EDL, treatment decreased fast isomyosin FM3 by 60% compared with controls. Sodium dodecyl sulfate-gel electrophoresis also showed a decrease of parvalbumin in EDL by approximately 50%. Treatment had no significant effect on the isomyosin composition of heart ventricle. Levels of physical activity and concentrations of serum glucose and thyroxine of treated mice were not significantly different from controls. These results indicate a role for intracellular energetics in mediating adaptive changes in the phenotype of muscle in mature animals.
DOI: --
发表时间: 1982
期刊: The Journal of biological chemistry
影响因子: --
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通讯作者: Kushmerick,MJ
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影响因子: 15
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DOI: --
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影响因子: --
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发表时间: 1976
影响因子: 4.1
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