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Effects of Δ9-tetrahydrocannabinol in individuals with a familial vulnerability to alcoholism

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Abstract

Background and aims

A family history (FH) of alcoholism accounts for approximately 50 % of the risk of developing alcohol problems. Several lines of preclinical evidence suggest that brain cannabinoid receptor (CB1R) function may mediate the effects of alcohol and risk for developing alcoholism including the observations that reduced CB1R function decreases alcohol-related behaviors and enhanced CB1R function increases them. In this first human study, we probed CB1R function in individuals vulnerable to alcoholism with the exogenous cannabinoid Δ9-tetrahydrocannabinol (Δ9-THC).

Design, setting, and participants

Healthy volunteers (n = 30) participated in a three test day study during which they received 0.018 and 0.036 mg/kg of Δ9-THC, or placebo intravenously in a randomized, counterbalanced order under double-blind conditions.

Measurements

Primary outcome measures were subjective “high,” perceptual alterations, and memory impairment. Secondary outcome measures consisted of stimulatory and depressant subjective effects, attention, spatial memory, executive function, Δ9-THC and 11-hydroxy-THC blood levels, and other subjective effects. FH was calculated using the Family Pattern Density method and was used as a continuous variable.

Findings

Greater FH was correlated with greater “high” and perceptual alterations induced by Δ9-THC. This enhanced sensitivity with increasing FH was specific to Δ9-THC’s rewarding effects and persisted even when FH was calculated using an alternate method.

Conclusions

Enhanced sensitivity to the rewarding effects of Δ9-THC in high-FH volunteers suggests that alterations in CB1R function might contribute to alcohol misuse vulnerability.

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Acknowledgments

The authors wish to acknowledge support from the National Institute of Alcoholism and Alcohol Abuse (NIAAA), the National Institute of Mental Health (NIMH), the National Institute of Drug Abuse (NIDA), the Department of Veterans Affairs, the Yale Center for Clinical Investigation (YCCI), and the Center for the Translational Neuroscience of Alcoholism (CTNA). This research project was funded by NIAAA through R21 AA16311 to DCD. The authors also thank Angelina Genovese, R.N.C., M.B.A.; Michelle San Pedro, R.N.; Elizabeth O’Donnell, R.N.; Sonah Yoo, R.Ph.; Rachel Galvan, R.Ph.; and Willie Ford of the Neurobiological Studies Unit at the VA Connecticut Healthcare System, West Haven Campus for their central contributions to the success of this project. The authors thank John H. Krystal, MD for his contributions toward the initial conceptualization of the study hypothesis.

Financial disclosures

R. Andrew Sewell, Jacqueline Elander, Ashley Schnakenberg, Ashley Williams, and Rajiv Radhakrishnan report no financial relationships with commercial interests. Mohini Ranganathan has in the past 3 years received research grant support administered through the Yale University School of Medicine from Eli Lilly Inc. Deepak Cyril D’Souza has in the past 3 years and currently receives research grant support administered through the Yale University School of Medicine from Astra Zeneca, Abbott Laboratories, Eli Lilly Inc., Organon, Pfizer Inc., and Sanofi; he is also a consultant for Bristol Meyers Squibb.

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Correspondence to Deepak Cyril D’Souza.

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R. Andrew Sewell was deceased.

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Ranganathan, M., Sewell, R.A., Carbuto, M. et al. Effects of Δ9-tetrahydrocannabinol in individuals with a familial vulnerability to alcoholism. Psychopharmacology 231, 2385–2393 (2014). https://doi.org/10.1007/s00213-013-3402-4

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  • DOI: https://doi.org/10.1007/s00213-013-3402-4

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