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Research ArticleNEUROPHARMACOLOGY

Pharmacological Evaluation of Cannabinoid Receptor Ligands in a Mouse Model of Anxiety: Further Evidence for an Anxiolytic Role for Endogenous Cannabinoid Signaling

Sachin Patel and Cecilia J. Hillard
Journal of Pharmacology and Experimental Therapeutics July 2006, 318 (1) 304-311; DOI: https://doi.org/10.1124/jpet.106.101287
Sachin Patel
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Cecilia J. Hillard
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Abstract

Extracts of Cannabis sativa have been used for their calming and sedative effects for centuries. Recent developments in drug discovery have suggested that modulation of neuronal endogenous cannabinoid signaling systems could represent a novel approach to the treatment of anxiety-related disorders while minimizing the adverse effects of direct acting cannabinoid receptor agonists. In this study, we evaluated the effects of direct cannabinoid receptor agonists and antagonists and endocannabinoid-modulating drugs on anxiety-like behavior in mice using the elevated-plus maze. We found that the direct CB1 receptor agonists (1R,3R,4R)-3-[2-hydroxy-4-(1,1-dimethylheptyl)phenyl]-4-(3-hydroxypropyl)cyclohexan-1-ol (CP 55,940) (0.001-0.3 mg/kg) and 2,3-dihydro-5-methyl-3[(4-morpholinyl)methyl]pyrrolo [1,2,3-de]-1,4-benzoxazinyl]-(1-naphthalenyl)methanone mesylate) (WIN 55212-2) (0.3-10 mg/kg) increased time spent on the open arms (To) at low doses only. At the highest doses tested, both compounds altered overall locomotor activity. In contrast, Δ9-tetrahydrocannabinol (0.25-10 mg/kg) produced a dose-dependent reduction in To. The endocannabinoid uptake/catabolism inhibitor 4-hydroxyphenylarachidonylamide (AM404) (0.3-10 mg/kg) produced an increase in To at low doses and had no effect at the highest dose tested. The fatty acid amide hydrolase inhibitor cyclohexyl carbamic acid 3′-carbamoyl-biphenyl-3-yl ester (URB597) (0.03-0.3 mg/kg) produced a monophasic, dose-dependent increase in To. The CB1 receptor antagonists N-(piperidin-1-yl)-5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-methyl-1H-pyrazole-3-carboxamide HCl (SR141716) (1-10 mg/kg) and N-(piperidin-1-yl)-5-(4-iodophenyl)-1-(2,4-dichlorophenyl)-4-methyl-1H-pyrazole-3-carboxamide (AM251) (1-10 mg/kg) produced dose-related decreases in To. These data indicate that activation of CB1 cannabinoid receptors reduces anxiety-like behaviors in mice and further support an anxiolytic role for endogenous cannabinoid signaling. These results suggest that pharmacological modulation of this system could represent a new approach to the treatment of anxiety-related psychiatric disorders.

Footnotes

  • This work was supported by National Institutes of Health Grants R01 DA 016967 (to C.J.H.) and F30 DA 15575 (to S.P.)

  • Article, publication date, and citation information can be found at http://jpet.aspetjournals.org.

  • doi:10.1124/jpet.106.101287.

  • ABBREVIATIONS: CB1, cannabinoid receptor type 1; 2-AG, 2-arachidonylglycerol; AEA, N-arachidonylethanolamine; eCB, endocannabinoid; FAAH, fatty acid amide hydrolase; WIN 55212-2, 2,3-dihydro-5-methyl-3[(4-morpholinyl)methyl]pyrrolo [1,2,3-de]-1,4-benzoxazinyl]-(1-naphthalenyl)methanone mesylate); SR141716, N-(piperidin-1-yl)-5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-methyl-1H-pyrazole-3-carboxamide HCl; AM251, N-(piperidin-1-yl)-5-(4-iodophenyl)-1-(2,4-dichlorophenyl)-4-methyl-1H-pyrazole-3-carboxamide; URB597, cyclohexyl carbamic acid 3′-carbamoyl-biphenyl-3-yl ester; CP 55,940, (1R,3R,4R)-3-[2-hydroxy-4-(1,1-dimethylheptyl)phenyl]-4-(3-hydroxypropyl)cyclohexan-1-ol; AM404, 4-hydroxyphenylarachidonylamide; THC, Δ9-tetrahydrocannabinol; To, time spent on the open arms of the elevated plus maze.

    • Received January 11, 2006.
    • Accepted March 27, 2006.
  • The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics: 376 (2)
Journal of Pharmacology and Experimental Therapeutics
Vol. 376, Issue 2
1 Feb 2021
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Research ArticleNEUROPHARMACOLOGY

Pharmacological Evaluation of Cannabinoid Receptor Ligands in a Mouse Model of Anxiety: Further Evidence for an Anxiolytic Role for Endogenous Cannabinoid Signaling

Sachin Patel and Cecilia J. Hillard
Journal of Pharmacology and Experimental Therapeutics July 1, 2006, 318 (1) 304-311; DOI: https://doi.org/10.1124/jpet.106.101287

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Research ArticleNEUROPHARMACOLOGY

Pharmacological Evaluation of Cannabinoid Receptor Ligands in a Mouse Model of Anxiety: Further Evidence for an Anxiolytic Role for Endogenous Cannabinoid Signaling

Sachin Patel and Cecilia J. Hillard
Journal of Pharmacology and Experimental Therapeutics July 1, 2006, 318 (1) 304-311; DOI: https://doi.org/10.1124/jpet.106.101287
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