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首页> 外文期刊>Cell cycle >Efficient adult skeletal muscle regeneration in mice deficient in p38beta, p38gamma and p38delta MAP kinases.
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Efficient adult skeletal muscle regeneration in mice deficient in p38beta, p38gamma and p38delta MAP kinases.

机译:p38beta,p38gamma和p38delta MAP激酶不足的小鼠体内的有效成年骨骼肌再生。

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Adult skeletal muscle is a very stable tissue containing a small population of myofiber-associated quiescent satellite cells compared with late embryoniceonatal skeletal muscle, which contains highly proliferating myoblasts and small actively growing myofibers, suggesting that specific regulatory pathways may control myogenesis at distinct developmental stages. The p38 MAPK signaling pathway is central for myogenesis, based on studies using immortalized and neonatal primary myoblasts in vitro. However, the contribution of this pathway to adult myogenesis has never been investigated. Four p38 isoforms (p38alpha, p38beta, p38gamma and p38delta) exist in mammalian cells, being p38alpha and p38gamma the most abundantly expressed isoforms in adult skeletal muscle. Given the embryoniceonatal lethality of p38alpha-deficient mice, here we investigate the relative contribution of p38beta, p38gamma and p38delta to adult myogenesis. Regeneration and myofiber growth of adult muscle proceeds with similar efficiency in mice lacking p38beta, p38gamma and p38delta as in wild-type control mice. In agreement with this, there is no difference in adult primary myoblasts behavior in vitro among the different genotypes. Importantly, the pattern of p38 activation (ascribed to p38alpha) remains unperturbed during satellite cell-mediated myogenesis in vitro and adult muscle regeneration in wild type and p38beta-, p38gamma- and p38delta-deficient mice, rendering p38alpha as the essential p38 isoform sustaining adult myogenesis. This study constitutes the first analysis addressing the functionality of p38beta, p38gamma and p38delta in satellite cell-dependent adult muscle regeneration and growth.
机译:与晚期胚胎/新生骨骼肌相比,成年骨骼肌是非常稳定的组织,包含少量的与肌纤维相关的静止卫星细胞,后者包含高度增殖的成肌细胞和小的活跃生长的肌纤维,这表明特定的调节途径可能在不同的发育过程中控制肌发生阶段。 p38 MAPK信号转导通路是成肌的关键,这是根据体外使用永生化和新生初生成肌细胞的研究得出的。然而,从未研究过该途径对成年肌生成的贡献。哺乳动物细胞中存在四种p38同工型(p38alpha,p38beta,p38gamma和p38delta),其中p38alpha和p38gamma是成年骨骼肌中表达最丰富的同工型。给定p38alpha缺陷小鼠的胚胎/新生儿致死率,在这里我们研究p38beta,p38gamma和p38delta对成年肌生成的相对贡献。在缺乏p38beta,p38gamma和p38delta的小鼠中,成年肌肉的再生和肌纤维生长以与野生型对照小鼠相似的效率进行。与此相符的是,不同基因型的体外成年成年成肌细胞的行为没有差异。重要的是,在野生型和p38beta,p38gamma和p38delta缺陷型小鼠的体外卫星细胞介导的成肌过程和成年肌肉再生过程中,p38激活的模式(归因于p38alpha)仍然不受干扰,从而使p38alpha成为维持p38亚型的必需成体肌发生。这项研究构成了针对p38beta,p38gamma和p38delta在卫星细胞依赖性成年肌肉再生和生长中功能的第一个分析。

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