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Related Experiment Videos

CB1 cannabinoid receptor-mediated cell migration.

Z H Song1, M Zhong

  • 1Department of Pharmacology and Toxicology, University of Louisville School of Medicine, Louisville, Kentucky 40292, USA. zhsong@louisville.edu

The Journal of Pharmacology and Experimental Therapeutics
|June 28, 2000
PubMed
Summary
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Cannabinoid agonists activate CB1 receptors to induce cell migration via chemotaxis and chemokinesis. This process involves G protein signaling and mitogen-activated protein kinase pathways, but not adenylate cyclase.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Pharmacology

Background:

  • Cell migration is often regulated by G(i) protein-coupled receptors.
  • CB1 cannabinoid receptors are known to couple with pertussis toxin-sensitive G proteins.

Purpose of the Study:

  • To investigate whether CB1 cannabinoid receptors mediate cell migration.
  • To elucidate the signaling pathways involved in cannabinoid-induced cell migration.

Main Methods:

  • Modified Boyden chamber assays were used to assess cell migration.
  • Human embryonic kidney 293 cells stably expressing CB1 receptors were utilized.
  • Pertussis toxin, SR141716A (CB1 antagonist), PD098059 (MAPK inhibitor), and cAMP analogs were employed.

Main Results:

Related Experiment Videos

  • Cannabinoid agonists (HU-210, WIN55212-2, anandamide) induced concentration-dependent migration of CB1-expressing cells.
  • Pertussis toxin abolished cannabinoid-induced migration, confirming G protein mediation.
  • CB1 antagonism and MAPK pathway activation were critical for migration; cAMP signaling was not involved.

Conclusions:

  • Cannabinoid agonists induce chemotaxis and chemokinesis mediated by G protein-coupled CB1 receptors.
  • Mitogen-activated protein kinase activation is crucial for CB1-mediated cell migration.
  • Adenylate cyclase inhibition is unlikely to be involved in this migratory process.