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  • The psychomotor, reinforcin...
    Jeon, Kyung Oh; Kim, Oc-Hee; Seo, Su Yeon; Yun, Jaesuk; Jang, Choon-Gon; Lim, Ri-Na; Kim, Tae Wan; Yang, Chae Ha; Yoon, Seong Shoon; Jang, Eun Young

    European journal of pharmacology, 04/2024, Letnik: 969
    Journal Article

    The chronic use of the novel synthetic cathinone mexedrone, like other psychoactive drugs, can be considered addictive, with a high potential for abuse and the ability to cause psychological dependence in certain users. However, little is known about the neurobehavioral effects of mexedrone in association with its potential for abuse. We investigated the abuse potential for mexedrone abuse through multiple behavioral tests. In addition, serotonin transporter (SERT) levels were measured in the synaptosome of the dorsal striatum, and serotonin (5-HT) levels were measured in the dorsal striatum of acute mexedreone (50 mg/kg)-treated mice. To clarify the neuropharmacological mechanisms underlying the locomotor response of mexedrone, the 5-HT2A receptor antagonist M100907 (0.5 or 1.0 mg/kg) was administered prior to the acute injection of mexedrone in the locomotor activity experiment in mice. Mexedrone (10–50 mg/kg) produced a significant place preference in mice and mexedrone (0.1–0.5 mg/kg/infusion) maintained self-administration behavior in rats in a dose-dependent manner. In the drug discrimination experiment, mexedrone (5.6–32 mg/kg) was fully substituted for the discriminative stimulus effects of cocaine in rats. Mexedrone increased locomotor activity, and these effects were reversed by pretreatment with M100907. Acute mexedrone significantly increased c-Fos expression in the dorsal striatum and decreased SERT levels in the synaptosome of the dorsal striatum of mice, resulting in an elevation of 5-HT levels. Taken together, our results provide the possibility that mexedrone has abuse potential, which might be mediated, at least in part, by the activation of the serotonergic system in the dorsal striatum. •Mexedrone produces addictive-like behaviors similar to methamphetamine in rodents.•Mexedrone increases 5-HT levels via inhibition of SERT in the dorsal striatum.•M100907 attenuates acute mexedrone-induced hyperlocomotion.