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Diuretic effects of cannabinoids.

Carol A Paronis1, Ganesh A Thakur, Shama Bajaj

  • 1Department of Pharmaceutical Sciences, Northeastern University, Mailstop 206, 140TF 360 Huntington Avenue, Boston, MA 02115, USA. c.paronis@neu.edu

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Cannabinoid (CB) agonists, particularly CB1 agonists, significantly increase urine production (diuresis) in rats, comparable to diuretic drugs like furosemide. These diuretic effects are mediated through CB1 receptors and are dose-dependent.

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Area of Science:

  • Pharmacology
  • Neuroscience
  • Renal Physiology

Background:

  • Cannabinoid (CB) agonists are typically evaluated for locomotor activity, hypothermia, catalepsy, and analgesia.
  • Existing research has not extensively focused on the potential diuretic effects of CB agonists.

Purpose of the Study:

  • To investigate and characterize the in vivo diuretic effects of various cannabinoid (CB) agonists in rats.
  • To compare the potency of CB agonists for inducing diuresis versus hypothermia.
  • To determine the receptor mechanisms underlying cannabinoid-induced diuresis.

Main Methods:

  • Measurement of urine output and colonic temperature in female rats over 2 hours post-injection of CB agonists.
  • Dose-response assessments for several direct-acting CB1 agonists (e.g., Δ(9)-THC, WIN 55,212, AM2389, AM4054).
  • Antagonism studies using rimonabant (CB1 antagonist), capsazepine (TRPV1 antagonist), and AM630 (CB2 antagonist).

Main Results:

  • Direct-acting CB1 agonists produced dose-dependent increases in diuresis and hypothermia, with diuresis often occurring at lower doses.
  • CB1 agonists like AM4054 demonstrated robust diuretic effects comparable to furosemide and U50-488.
  • Diuretic effects were mediated by CB1 receptors, as evidenced by dose-dependent antagonism by rimonabant, and were not observed with CB2 agonists or anandamide transport inhibitors.

Conclusions:

  • Cannabinoid agonists, particularly those acting on CB1 receptors, possess significant diuretic properties in rats.
  • The diuretic effects are mediated via CB1 receptor activation.
  • These findings add diuresis to the known spectrum of in vivo effects of CB agonists.