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相关概念视频

Negative Regulator Molecules01:23

Negative Regulator Molecules

Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
Co-activators and Co-repressors02:04

Co-activators and Co-repressors

Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
Positive Regulator Molecules02:39

Positive Regulator Molecules

Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
Cell Signaling in Plants01:25

Cell Signaling in Plants

Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
MAPK Signaling Cascades01:07

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...
Repressible Operon: trp Operon01:21

Repressible Operon: trp Operon

The trp operon in Escherichia coli exemplifies a repressible operon. It regulates the synthesis of tryptophan through repressor-mediated transcriptional control and attenuation. This dual regulatory mechanism ensures tryptophan biosynthesis occurs only when needed, conserving cellular resources.Structure of the trp OperonThe trp operon consists of five structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes for tryptophan biosynthesis. These genes are transcribed as a single...

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相关实验视频

Updated: Jul 6, 2026

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
09:32

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development

Published on: June 15, 2017

CCN 蛋白质:多功能信号调节器

Bernard Perbal1

  • 1Laboratoire d'Oncologie Virale et Moléculaire, UFR de Biochimie, Université Paris 7-D Diderot, 75005, Paris, France. perbal@ccr.jussieu.fr

Lancet (London, England)
|January 16, 2004
PubMed
概括
此摘要是机器生成的。

结合性组织生长因子 (CCN2) 作为肝星细胞的细胞粘附因子. 其独特的异构体与LRP的结合方式不同,影响细胞信号传递和生物活动.

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相关实验视频

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09:32

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08:35

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科学领域:

  • 生物化学 生物化学
  • 细胞生物学 细胞生物学
  • 分子医学是分子医学.

背景情况:

  • 矩阵蛋白,包括CCN家族 (cyr61,ctgf,nov),对于细胞信号传递,增殖和分化至关重要.
  • CCN2 (连接组织生长因子) 被确定为肝星细胞的关键细胞粘附因子.
  • 肝星细胞在接触转化生长因子β时产生不同的CCN2异型.

研究的目的:

  • 在肝星细胞中研究CCN2异型的细胞粘附性质.
  • 阐明特定的CCN2模块在与低密度脂蛋白受体相关蛋白 (LRP) 结合中的作用.
  • 了解CCN2异构体与LRP的差异性结合如何影响生物活动和信号传递.

主要方法:

  • 分析肝星细胞的CCN2异型生成.
  • 描述CCN2模块与LRP的相互作用.
  • 研究CCN2和LRP之间依赖肝素的结合机制.

主要成果:

  • CCN2 作为肝星细胞的细胞粘附因子.
  • CCN2模块3调解了对LRP的肝素依赖性结合.
  • CCN2模块4促进了LRP独立的粘附.
  • CCN2异形对LRP的差异性结合表明了取决于上下文的激进或对抗性活动.

结论:

  • CCN2异型的特定配置会影响它们的生物活动和生物可用性.
  • 了解CCN2多功能性的结构基础对于其在分子医学中的应用至关重要.
  • 对截断的CCN异形生产机制的进一步研究是必不可少的.