通过基因激活蛋白激酶调节骨肌肉分化的不同阶段

相关实验视频

Updated: Aug 8, 2026

14:47

Identification of MyoD Interactome Using Tandem Affinity Purification Coupled to Mass Spectrometry

Published on: May 17, 2016

A M Bennett¹, N K Tonks

¹Cold Spring Harbor Laboratory, Demerec Building, 1 Bungtown Road, Post Office Box 100, Cold Spring Harbor, NY 11724, USA.

Science (New York, N.Y.)

|November 21, 1997

概括

中原激活蛋白激酶 (MAPK) 酸酶-1 (MKP-1) 调节骨肌肉的分化. MKP-1控制肌肉特异性基因表达和肌管形成,突出显示了MAPK在肌肉生成中的信号作用.

科学领域:

细胞和分子生物学细胞和分子生物学
肌肉发育和生理学
信号转导路径信号转导路径

背景情况:

连接外部刺激与肌肉细胞发育 (肌形成) 的精确信号机制仍然不清楚.
从C2C12神经细胞中提取米托基因导致p42Erk2的不活化和肌肉特异性基因上调.
线素激活蛋白激酶 (MAPK) 途径与细胞分化过程有关.

研究的目的:

研究MAPK酸酶-1 (MKP-1) 在肌肉形成调节中的作用.
确定MKP-1如何影响肌肉特异性基因表达和肌管形成.
阐明MAPKs在骨肌分化的早期和晚期阶段的功能.

主要方法:

在C2C12核细胞中MAPK酸酶-1 (MKP-1) 的过度表达.
评估p42Erk2活动.
对肌肉特异性基因表达的监测.
对肌管形成和肌重链表达的评估.

主要成果:

过度表达MKP-1抑制了p42Erk2的活性,缓解了肌肉特异性基因因子诱导的抑制.
内源MKP-1水平在肌体发生的后期阶段下降.
在分化过程中强迫MKP-1表达阻断了髓管的形成,尽管正常的髓重链表达.

结论:

肌肉特异性基因表达是必不可少的,但不足以完全结合肌管.
由MKP-1调节的MAPK信号,在骨肌肉分化早期和晚期都起着关键作用.
MKP-1 作为一个关键的调节剂,影响从分化肌细胞到功能肌管的过渡.

相关概念视频

02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...

02:38

Mitogens and the Cell Cycle

Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...

01:13

Formation of Muscle Fibers from Myoblasts

De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
Muscle progenitor cells (MPCs) are formed from the myotomes. MPCs express genes that encode the transcription factors Pax3 and Pax7. Along with Pax 3/7, other transcription factors...

01:07

MAPK Signaling Cascades

Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...

01:22

PI3K/mTOR/AKT Signaling Pathway

The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a rapamycin-insensitive companion...