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相关概念视频

The Ras Gene02:38

The Ras Gene

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The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a...
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Interactions Between Signaling Pathways01:19

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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
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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...
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Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
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Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high...
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不同的过度活跃的RAS/MAPK等位基因汇聚在共同的GABAergic内部神经元核心程序上.

Sara J Knowles1, April M Stafford2, Tariq Zaman2

  • 1School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA.

Development (Cambridge, England)
|May 31, 2023
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概括

在发育中的脑细胞中RAS/MAPK通路过度激活会改变GABAergic内部神经元程序. 这项研究揭示了突变如何影响神经发育,并可能为相关认知障碍的治疗提供信息.

关键词:
在 Nf1 的情况下.bRafaf 的意思是皮层内部神经元的内部神经元这就是MAPKK的意思.拉索病症是一种RAS病症.索马托斯塔丁是一种体质的药物.

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科学领域:

  • 神经科学是一个神经科学.
  • 遗传学 遗传学 是一个
  • 细胞生物学 细胞生物学

背景情况:

  • RAS/MAPK通路功能障碍与癌症和神经认知障碍有关.
  • 在神经发育中RAS/MAPK基因的作用比癌症的理解要少.
  • RAS/MAPK基因突变对大脑表型的影响可能会影响多种疾病.

研究的目的:

  • 为了研究皮质GABAergic内部神经元中激活RAS/MAPK通路的细胞和分子效应.
  • 为了识别由不同的RAS/MAPK基因突变改变的常见GABAergic程序.
  • 探索药理干预RAS/MAPK介导的神经发育变化的可能性.

主要方法:

  • 利用两个不同的基因来过激活皮质GABAergic内部神经元中的RAS/MAPK通路.
  • 评估了途径过度激活的细胞和分子后果.
  • 研究了药理学RAS/MAPK通路抑制的影响.

主要成果:

  • 在两个过度活跃的RAS/MAPK突变体中发现了常见的GABAergic核心程序.
  • 证明过度活跃的RAS/MAPK突变使发育中的皮质内神经元偏向于索马托斯塔丁阳性命运.
  • 表明药理上抑制RAS/MAPK信号传递可以防止索马托斯塔丁阳性内神经元的增加.

结论:

  • 在神经发育过程中,RAS/MAPK通路的过度激活趋向于GABAergic内部神经元.
  • 不同的RAS/MAPK突变可能对内部神经元发育具有共同的下游影响.
  • 研究结果提供了与RAS/MAPK通路基因相关的神经发育障碍的见解,并建议治疗点.