Competitive and noncompetitive NMDA antagonists block sensitization to methamphetamine

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Abstract

The present study examined the effects of both competitive (D-CPP-ene) and noncompetitive (MK-801) NMDA antagonists on behavioral sensitization to methamphetamine (MA). Behavioral effects of repeated administration of NMDA antagonists were also examined. Rats treated with MA according to an escalating dose schedule (2.5, 5, 7.5, and 10.0 mg/kg, SC, twice a day on days 1, 3, 5, and 7, respectively) indicated behavioral supersensitivity. Pretreatment with either MK-801 (0.5 mg/kg, IP) or D-CPP-ene (20 mg/kg, IP) prior to MA administration prevented the development of the supersensitivity. Rats treated with MK-801 showed a decrease in the motor activity when subsequently challenged with MK-801 compared with saline-treated rats. Likewise, rats administered with D-CPP-ene showed decreased motor activity when challenged with D-CPP-ene. There was no cross-sensitization nor tolerance between MA and MK-801 or D-CPP-ene. These results suggest that both competitive and noncompetitive NMDA antagonists block sensitization to MA and that repeated administration with NMDA antagonists results in behavioral tolerance.

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    Indeed, although the exact molecular mechanisms underlying the behavioral sensitization remain to be clarified (Ujike et al., 2002a; 2002b; Kawasaki et al., 2004; Landa et al., 2014), there is ample experimental evidence showing that the NMDA glutamate receptor plays an essential role in sensitization phenomena, especially in the sensitization (or reverse tolerance) to psychostimulants (Landa et al., 2014) that results in manic-like behaviors in animals and humans. Its stimulation is, in fact, necessary for the sensitization of amphetamine (Wolf et al., 1994; Ohmori et al., 1994; Vezina and Queen, 2000; Battisti et al., 2000; Pacchioni et al., 2002; Grönig et al., 2004), methylphenidate (Gaytan et al., 2000), cocaine (Li et al., 2000; Heusner and Palmiter, 2005; Rompré et al., 2006; Kim et al., 1996), apomorphine (Võikar et al., 1999; Acerbo et al., 2004) and other dopamine mimetics (Kalivas, 1995; Rockhold, 1998), nicotine (Kelsey et al., 2002), morphine (Jeziorski et al., 1994; Trujillo, 2002) and ethanol (Broadbent and Weitemier, 1999; Camarini et al., 2000; Kotlinska et al., 2006), as well as several types of stress such as, for instance, ‘restraint stress’ (Pacchioni et al., 2002) and ‘social defeat stress’ (Yap et al., 2005). Incidentally, it is worth recalling that the sensitization (also called reverse tolerance) to psychostimulants (amphetamine-cocaine) results in manic-like behaviors in animals and in manic-like syndromes in humans (indeed, the so called “ amphetamine psychosis” considered for a long time as “paranoid schizophrenia”, can be considered, in accordance with the more recent nosography, a manic episode with psychotic symptoms).

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