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- W3015097529 abstract "Synthetic cannabinoid receptor agonists (SCRAs) possess high abuse liability and complex toxicological profiles, making them serious threats to public health. EG-018 is a SCRA that has been detected in both illicit products and human samples, but it has received little attention to date. The current studies investigated EG-018 at human CB1 and CB2 receptors expressed in HEK293 cells in [3H]CP55,940 competition binding, [35S]GTPγS binding and forskolin-stimulated cAMP production. EG-018 was also tested in vivo for its ability to produce cannabimimetic and abuse-related effects in the cannabinoid tetrad and THC drug discrimination, respectively. EG-018 exhibited high affinity at CB1 (21 nM) and at CB2 (7 nM), but in contrast to typical SCRAs, behaved as a weak partial agonist in [35S]GTPγS binding, exhibiting lower efficacy but greater potency, than that of THC at CB1 and similar potency and efficacy at CB2. EG-018 inhibited forskolin-stimulated cAMP with similar efficacy but lower potency, compared to THC, which was likely due to high receptor density facilitating saturation of this signaling pathway. In mice, EG-018 (100 mg/kg, 30 min) administered intraperitoneally (i.p.) did not produce effects in the tetrad or drug discrimination nor did it shift THC's ED50 value in drug discrimination when administered before THC, suggesting EG-018 has negligible occupancy of brain CB1 receptors following i.p. administration. Following intravenous (i.v.) administration, EG-018 (56 mg/kg) produced hypomotility, catalepsy, and hypothermia, but only catalepsy was blocked by the selective CB1 antagonist rimonabant (3 mg/kg, i.v.). Additional studies of EG-018 and its structural analogues could provide further insight into how cannabinoids exert efficacy through the cannabinoid receptors." @default.
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- W3015097529 date "2020-06-01" @default.
- W3015097529 modified "2023-10-17" @default.
- W3015097529 title "In vitro and in vivo pharmacological evaluation of the synthetic cannabinoid receptor agonist EG-018" @default.
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- W3015097529 doi "https://doi.org/10.1016/j.pbb.2020.172918" @default.
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