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Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal01:22

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Erythropoietin-producing hepatocellular carcinoma receptor (Eph) and its ligand, Eph receptor-interacting protein (Ephrin) were first discovered in the human carcinoma cell line, hence the name. Ephrin-Eph interaction guides cells to reach their appropriate location in adult tissues. They also play an essential role in the immune system by helping in immune cell migration, adhesion, and activation. Based on their structure and function, Eph is divided into two classes — EphA and EphB.
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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 affinity and are together...
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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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Assaying the Ability of Diffusible Signaling Molecules to Reorient Embryonic Spinal Commissural Axons
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Published on: March 8, 2010

Grb4 and GIT1 transduce ephrinB reverse signals modulating spine morphogenesis and synapse formation.

Inmaculada Segura1, Clara L Essmann, Stefan Weinges

  • 1Max-Planck Institute of Neurobiology, Am Klopferspitz 18, D-82152 Martinsried, Germany.

Nature Neuroscience
|February 21, 2007
PubMed
Summary

EphrinB reverse signaling is crucial for dendritic spine morphogenesis, involving Grb4 and GIT1 proteins. This pathway is essential for proper synapse formation and development in neurons.

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Published on: April 23, 2015

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Dendritic spines are critical sites for excitatory synaptic input in the brain.
  • Spine morphogenesis is vital for neural development and synaptic plasticity.
  • Cytoskeletal regulators play key roles in spine formation and maintenance.

Purpose of the Study:

  • To investigate the role of ephrinB reverse signaling in dendritic spine morphogenesis.
  • To identify the molecular pathway downstream of ephrinBs involved in spine formation.

Main Methods:

  • Utilized cultured rat hippocampal neurons.
  • Investigated the interaction between ephrinBs, Grb4, and GIT1.
  • Examined the effects of pathway disruption on spine and synapse formation.

Main Results:

  • EphrinB reverse signaling is essential for correct spine morphogenesis.
  • The adaptor protein Grb4 and GIT1 mediate this function.
  • Disruption of the ephrinB-Grb4-GIT1 pathway impairs spine and synapse formation.

Conclusions:

  • EphrinB reverse signaling plays a significant role in dendritic spine formation.
  • The downstream pathway involves Grb4 binding to phosphorylated GIT1 at Tyr392.
  • This pathway is critical for establishing neuronal structure and function.