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CB1 cannabinoid receptor-mediated tyrosine phosphorylation of focal adhesion kinase-related non-kinase

Dan Zhou1, Z H Song

  • 1Department of Pharmacology and Toxicology, School of Medicine, University of Louisville, Louisville, KY 40292, USA.

FEBS Letters
|August 7, 2002
PubMed

Insights

Cannabinoids activate the CB1 receptor to increase tyrosine phosphorylation of FRNK, but not FAK, in neuroblastoma cells. This suggests a new pathway for cannabinoid-induced cellular changes.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pharmacology

Background:

  • Focal adhesion kinase (FAK) and FAK-related non-kinase (FRNK) are key regulators of cell signaling and adhesion.
  • Cannabinoids are known to modulate various cellular functions through specific receptors.

Purpose of the Study:

  • To investigate the effect of cannabinoids on the tyrosine phosphorylation of FAK and FRNK in differentiated mouse neuroblastoma N1E-115 cells.
  • To elucidate the signaling pathway involved in cannabinoid-induced phosphorylation changes.

Main Methods:

  • Treatment of N1E-115 cells with HU-210, a cannabinoid agonist.
  • Assessment of tyrosine phosphorylation of FAK and FRNK using Western blotting.
  • Use of antisense oligodeoxynucleotide targeting the CB1 cannabinoid receptor.
  • Inhibition studies using 8-Br-cAMP.

Main Results:

  • HU-210 significantly enhanced the tyrosine phosphorylation of FRNK in a time-dependent manner, while FAK phosphorylation remained unaffected.
  • The HU-210-induced FRNK tyrosine phosphorylation was abolished by pretreatment with CB1 receptor antisense oligodeoxynucleotide.
  • Pretreatment with 8-Br-cAMP also blocked the HU-210-induced FRNK tyrosine phosphorylation.

Conclusions:

  • HU-210 activates the G(i)-coupled CB1 cannabinoid receptor to induce FRNK tyrosine phosphorylation in N1E-115 cells.
  • This cannabinoid-induced FRNK tyrosine phosphorylation represents a novel signaling mechanism potentially contributing to cannabinoid-mediated functional outcomes.

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