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Imaging G-protein Coupled Receptor (GPCR)-mediated Signaling Events that Control Chemotaxis of Dictyostelium Discoideum
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Imaging G-protein Coupled Receptor (GPCR)-mediated Signaling Events that Control Chemotaxis of Dictyostelium Discoideum

Published on: September 20, 2011

Control of receptor internalization, signaling level, and precise arrival at the target in guided cell migration

Sofia Minina1, Michal Reichman-Fried, Erez Raz

  • 1Germ Cell Development, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, Göttingen, Germany.

Current Biology : CB
|June 30, 2007
PubMed

Insights

Chemokine receptor CXCR4 signaling fine-tunes cell migration. Receptor internalization and signaling control are crucial for precise cell positioning in vivo, but not for basic movement.

Area of Science:

  • Cellular and Molecular Biology
  • Developmental Biology
  • Immunology

Background:

  • The chemokine receptor CXCR4, activated by SDF1, regulates critical biological processes including development, immune response, and disease.
  • Phosphorylation of CXCR4's carboxyl terminus controls signaling and receptor internalization, processes implicated in WHIM syndrome, an immunodeficiency disorder.
  • Conflicting in vitro data exist regarding the role of CXCR4's carboxyl terminus in chemotaxis, necessitating in vivo investigation.

Purpose of the Study:

  • To investigate the physiological role of CXCR4 signaling level control and receptor internalization in SDF-1-guided cell migration.
  • To determine the necessity of these regulatory mechanisms for cell motility, directional sensing, and precise migration in vivo.

Main Methods:

  • Utilizing zebrafish as a model organism to study chemokine receptor function in a live animal setting.
  • Analyzing the impact of CXCR4 regulation on the migration of zebrafish primordial germ cells (PGCs) to their target destination.

Main Results:

  • While receptor internalization and signaling control are not essential for basic cell motility or directional sensing, they are critical for fine-tuning migration.
  • These regulatory mechanisms ensure the precise arrival of zebrafish PGCs at the developing gonad region.
  • The study highlights the in vivo importance of CXCR4 signaling modulation for accurate cell positioning.

Conclusions:

  • Control over CXCR4 signaling intensity and receptor internalization are essential for the fine-tuning of cell migration in vivo.
  • These processes enable precise spatial navigation of cells, as demonstrated by zebrafish PGC migration.
  • Understanding these mechanisms offers insights into developmental processes and diseases involving cell migration.

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