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Differential effects of TRPV1 receptor ligands against nicotine-induced depression-like behaviors

Tamaki Hayase1

  • 1Department of Legal Medicine, Kyoto University, Kyoto 606-8501, Japan. thayase@mri.biglobe.ne.jp

BMC Pharmacology
|July 20, 2011
PubMed
Abstract

Insights

Transient receptor potential vanilloid 1 (TRPV1) agonists show antidepressant-like effects against nicotine-induced depression in mice. These findings highlight TRPV1 receptors

Area of Science:

  • Neuroscience
  • Pharmacology
  • Behavioral Science

Background:

  • Nicotine (NC) use is linked to depression, with cannabinoid (CB) receptors, particularly CB1, implicated in its behavioral effects.
  • Transient receptor potential vanilloid 1 (TRPV1) receptors are hypothesized to mediate some of these effects, suggesting TRPV1 ligand activation as a therapeutic strategy.

Purpose of the Study:

  • To investigate the role of TRPV1 receptors in nicotine-induced depression-like behaviors in a mouse model.
  • To examine the effects of TRPV1 ligands, with and without CB1 receptor affinity, on these behaviors.

Main Methods:

  • Mice were treated with nicotine (NC) or immobilization stress (IM) to induce depression-like behaviors, assessed via forced swimming and tail suspension tests.
  • Effects of TRPV1 agonists (capsaicin, olvanil), a TRPV1 antagonist (capsazepine), endogenous CB1 agonists (anandamide, N-arachidonyldopamine), and a hybrid CB1/TRPV1 agonist (arvanil) were evaluated.

Main Results:

  • Both NC and IM induced depression-like behaviors, which were attenuated by TRPV1 agonists capsaicin and olvanil.
  • The TRPV1 antagonist capsazepine did not affect these behaviors, while endogenous CB1 agonists showed no antidepressant-like effects.
  • The hybrid agonist arvanil demonstrated significant antidepressant-like effects, not blocked by capsazepine or the CB1 antagonist AM 251.

Conclusions:

  • TRPV1 receptor agonists exhibit antidepressant-like effects in nicotine-induced depression, similar to immobilization stress.
  • The potent TRPV1 and CB1 agonist arvanil shows significant antidepressant-like effects, potentially involving non-TRPV1 or non-CB1 mechanisms.
  • These findings suggest a therapeutic role for targeting TRPV1 receptors in managing nicotine abuse and associated depressive symptoms.

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