These findings should be taken into account when planning trials with CXCR3 antagonists. Laboratory Investigation (2012) 92, 724-734;

doi:10.1038/labinvest.2012.48; published online 19 March 2012″
“Intravenous infusions of nicotine appear to exert little primary reinforcing effects in adult rats but, instead, maintain self-administration behavior at least, in part, by increasing the intrinsic Selleck KPT-8602 reinforcing effects of drug-paired sensory stimuli. The present study examined instead the impact of a motivationally neutral cue on self-administration.

Adult male Long-Evans rats were permitted to self-administer nicotine (0.015 mg/kg IV given over 30 s, 2 h/day) or saline presented with or without a sensory stimulus (light, white noise). Fixed and progressive ratio reinforcement schedules of nicotine reinforcement were tested. Experiment 2 determined whether noncontingent nicotine or mecamylamine (nicotinic antagonist) would induce lever pressing for either sensory stimulus. Experiment 3 tested whether the white noise stimulus alone could maintain responding after repeated pairing with self-administered Silmitasertib clinical trial nicotine. Finally, the sensory stimuli were assessed for possible aversive properties.

Nicotine infusions

alone were at best weakly reinforcing. The white noise stimulus, presented alone, was neither reinforcing nor aversive, whereas the white light appeared marginally reinforcing. Both stimuli, however, facilitated intravenous nicotine self-administration. Neither nicotine nor mecamylamine challenge rendered the white noise reinforcing. The white noise, after being self-administered with nicotine, failed to maintain self-administration behavior on its own.

Even a motivationally neutral sensory stimulus, lacking detectable primary or secondary reinforcing properties, can facilitate self-administration of nicotine. Possibly, drug-paired stimuli provide a “”response marker”" or serve as a temporal bridge between the operant response and drug effect. Motivationally neutral stimuli may therefore serve to isolate primary reinforcing effects of nicotine.”
“Bipolar disorder

(BD) is a chronic and highly disabling mood disorder, associated with the highest suicide rate among psychiatric disorders. Even though neurobiological bases oxyclozanide of BD have still to be further elucidated, recent neuroimaging studies provided compelling evidence about functional correlates of cognitive deficits in BD patients, with working memory (WM) impairment being one of the most commonly reported findings. Such dysfunctions are likely to persist beyond acute phases of the illness, so they qualify as endophenotypic markers for the disorder. This review sought to synthesize, through a MEDLINE search up to December 2012, published functional magnetic resonance imaging (fMRI) studies on WM networks, conducted through N-back task in euthymic BD I patients and including a control comparison group. Eight studies meeting the search criteria were identified.