Time course of myosin heavy chain transitions in neonatal rats: importance of innervation and thyroid state.

Time course of myosin heavy chain transitions in neonatal rats: importance of innervation and thyroid state.
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新生大鼠肌球蛋白重链转变的时间进程:神经支配和甲状腺状态的重要性。

DOI:
10.1152/ajpregu.1999.276.4.r954
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发表时间:
1999
期刊:
The American journal of physiology.
影响因子:
--
通讯作者:
Baldwin,KM
Baldwin,KM
中科院分区:
--
文献类型:
--
作者:
Adams,GR;McCue,SA;Zeng,M;Baldwin,KM

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在出生后,大鼠肢体肌肉适应承重通过替换胚胎(Emb)和新生儿(Neo)肌球蛋白重链(MHC)的成人亚型。我们的目的是表征这一转变在骨骼肌中表达的六种MHC亚型,并确定神经支配和甲状腺激素状态对成人MHC表型的重要性。用丙基硫氧嘧啶(PTU)致新生大鼠甲状腺功能低下。在正常和PTU亚组中,腿部肌肉在15日龄时单侧失神经支配。在产后7、14、23和30天测定跖肌(PLN)和比目鱼肌(Sol)的MHC谱。在第7天,Sol的MHC谱是55%的I型,30%的Emb,和10%的Neo;在PLN中,模式是60%的Neo和25%的Emb。到第30天,Sol和PLN在对照组中基本上获得了成人MHC谱。PTU增强缓慢的MHC表达的溶胶,而在PLN它显着抑制IIb MHC保留新生儿的MHC表达。去神经钝化的PLN和I型溶胶中的IIb的上调,并转移模式,以更大的表达IIa和IIx MHC在两块肌肉。与以前的观察结果相反,这些研究结果共同表明,完整的甲状腺和神经支配状态是强制性的成人MHC表型的实现,特别是在快缩肌。
During the postnatal period, rat limb muscles adapt to weight bearing via the replacement of embryonic (Emb) and neonatal (Neo) myosin heavy chains (MHCs) by the adult isoforms. Our aim was to characterize this transition in terms of the six MHC isoforms expressed in skeletal muscle and to determine the importance of innervation and thyroid hormone status on the attainment of the adult MHC phenotype. Neonatal rats were made hypothyroid via propylthiouracil (PTU) injection. In normal and PTU subgroups, leg muscles were unilaterally denervated at 15 days of age. The MHC profiles of plantaris (PLN) and soleus (Sol) muscles were determined at 7, 14, 23, and 30 days postpartum. Atday 7, the Sol MHC profile was 55% type I, 30% Emb, and 10% Neo; in the PLN, the pattern was 60% Neo and 25% Emb. Byday 30the Sol and PLN had essentially attained an adult MHC profile in the controls. PTU augmented slow MHC expression in the Sol, whereas in the PLN it markedly repressed IIb MHC by retaining neonatal MHC expression. Denervation blunted the upregulation of IIb in the PLN and of Type I in the Sol and shifted the pattern to greater expression of IIa and IIx MHCs in both muscles. In contrast to previous observations, these findings collectively suggest that both an intact thyroid and innervation state are obligatory for the attainment of the adult MHC phenotype, particularly in fast-twitch muscles.
DOI: 10.1016/0012-1606(90)90196-p
发表时间: 1990-04-01
影响因子: 2.7
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期刊: EUROPEAN JOURNAL OF BIOCHEMISTRY
影响因子: --
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发表时间: 1988-07-01
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DOI: 10.1210/endo.132.2.7678799
发表时间: 1993
期刊: Endocrinology
影响因子: 4.8
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