Differential regulation by stimulants of neocortical expression of <i>mrt1</i>, <i>arc</i>, and <i>homer1a</i> mRNA in the rats treated with repeated methamphetamine

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<jats:title>Abstract</jats:title><jats:p>The present work was conducted to obtain clues for the possible roles of a novel stimulant‐inducible gene <jats:italic>mrt1</jats:italic> (methamphetamine‐responsive transcript 1) encoding a PDZ‐PX protein in stimulant‐induced behavioral sensitization. In the young adult rats, repeated daily treatment with methamphetamine (4 mg/kg, intraperitoneally, once a day) for 5 days caused an enhanced behavioral response to methamphetamine: behavioral sensitization. The 5‐day intermittent administration of MAP upregulated the basal expression of <jats:italic>mrt1</jats:italic> transcripts and eliminated the increasing effects of a challenge dose of MAP (1.6 mg/kg, i.p.) or cocaine (30 mg/kg, i.p.) on <jats:italic>mrt1</jats:italic> expression on day 14 of withdrawal in the neocortex that has been considered to be composed of a neuron circuit implicated in the sensitization phenomenon. In contrast, the basal expression of other stimulant‐inducible and plasticity‐related genes <jats:italic>arc</jats:italic> and <jats:italic>homer1a</jats:italic> and the ability of MAP or cocaine challenge to augment the amounts of their transcripts were not affected by the repeated MAP regimen in the cortical area. These findings suggest the differential regulation by stimulant of neocortical <jats:italic>mrt1, arc,</jats:italic> and <jats:italic>homer1a</jats:italic> expression in the behaviorally sensitized animals and supports the view that stimulant induction of <jats:italic>mrt1</jats:italic> may be involved in the early molecular signalings for stimulant sensitization. Synapse 49:143–149, 2003. © 2003 Wiley‐Liss, Inc.</jats:p>

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  • Synapse

    Synapse 49 (3), 143-149, 2003-05-09

    Wiley

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