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  • Title: Evaluation of the Modulatory Effects of Minor Cannabinoids and Terpenes on Delta-9-Tetrahydrocannabinol Discrimination in Rats.
    Author: Moore CF, Marusich J, Haghdoost M, Lefever TW, Bonn-Miller MO, Weerts EM.
    Journal: Cannabis Cannabinoid Res; 2023 Sep; 8(S1):S42-S50. PubMed ID: 37721992.
    Abstract:
    Introduction: Cannabis contains a multitude of phytocannabinoids and terpenes in addition to its main psychoactive constituent, delta-9-tetrahydrocannabinol (D9-THC). It is believed that the combination of minor cannabinoids and terpenes with D9-THC may impact the subjective and physiological effects of D9-THC. In this study, select minor cannabinoids (cannabigerol [CBG], cannabidivarin [CBDV], cannabichromene [CBC], tetrahydrocannabivarin [THCV], cannabigerolic acid [CBGa], and cannabidiolic acid [CBDa]) and terpenes (beta-caryophyllene and linalool) were evaluated for their potential to decrease the interoceptive effects of D9-THC using drug discrimination methods. Materials and Methods: Male and female rats (n=16; 50% female) were trained to discriminate D9-THC from vehicle. Following training, D9-THC was administered 45 min pre-session, followed by administration of a minor cannabinoid or terpene (or vehicle) 15 min pre-session. CBG, CBDV, CBC, and THCV were administered at doses of 3-30 mg/kg; CBGa and CBDa were administered at doses of 10-100 mg/kg; beta-caryophyllene and linalool were administered at doses of 10-30 mg/kg. Percentage of D9-THC responding (%) was calculated to assess changes to D9-THCs interoceptive effects. Results: CBG, CBDV, CBC, THCV, CBGa, CBDa, beta-caryophyllene, and linalool had little effect on percent D9-THC responding in either sex. No compounds lowered percent D9-THC responding to 50% or below. THCV, CBC, CBDa, and beta-caryophyllene in combination with D9-THC decreased response rates compared with D9-THC alone. Conclusions: The minor cannabinoids and terpenes examined in the current study did not alter the discriminative stimulus effects of D9-THC. These results suggest that these compounds are unlikely to lower the psychoactive effects of D9-THC in human users.
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