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The etiopathogenic mechanisms of schizophrenia are to date unknown, although several hypotheses have been suggested. Accumulating evidence suggests that excessive free radical production or oxidative stress may be involved in the pathophysiology of schizophrenia as evidenced by increased production of reactive oxygen or decreased antioxidant protection in(More)
OBJECTIVE The α7 nicotinic acetylcholine receptor (nAChR) is associated with cognitive and P50 auditory gating deficits in schizophrenia, and α7 nAChR agonists can potentially reverse these deficits. The authors examined multiple dosages of tropisetron, a partial agonist at the nAChR, for short-term effects on cognition and P50 deficits in schizophrenia. (More)
Accumulating evidence suggests BDNF as a molecule involved in the pathophysiology of schizophrenia. To examine the BDNF levels and the relationship between BDNF levels and psychopathology in patients with schizophrenia, 81 physically healthy patients with schizophrenia were compared with 45 age-, sex- matched normal controls. The psychopathology of patients(More)
Extracellular gradients of secreted guidance factors are known to guide axon pathfinding and neuronal migration. These factors are likely to bind to cell surfaces or extracellular matrix, but whether and how they may act in bound gradients remains mostly unclear. In this study, we have developed a new technique for rapid production of stable microscopic(More)
Several lines of evidence suggest that brain-derived neurotrophic factor (BDNF) plays a critical role in activity-dependent neuroplasticity underlying learning and memory in the hippocampus. Schizophrenia has a range of cognitive deficits that may evolve from decreased BDNF, and this study examines this association of BDNF with cognitive deficits in(More)
We showed previously that neonatal isolation (ISO) enhances acquisition of cocaine self-administration in adult male rats without altering acquisition of food responding. Female rats show poorer performance in learning tasks and are differentially affected by stress compared to male rats. Thus, we investigated whether ISO alters acquisition of operant(More)
Accumulating evidence showed that brain-derived neurotrophic factor (BDNF) may be involved in the pathophysiology of schizophrenia. Recent studies have reported that the Val66Met polymorphism of the BDNF gene may be associated with susceptibility for schizophrenia and age of onset of this disease, with mix results. In the present study, the BDNF Val66Met(More)
Our research demonstrates that neonatal isolation (ISO; 1 h/day isolation; postnatal days 2-9) enhances extracellular, ventral striatal dopamine (DA) responses to psychostimulants in infant and juvenile rats. In adult rats, we find ISO facilitates acquisition and maintenance of cocaine self-administration. We now test whether ISO enhances cocaine-induced(More)
Previously, we demonstrated that the early life stress of neonatal isolation facilitates acquisition of cocaine and food self-administration in adult female rats. We now test whether it enhances responding for these reinforcers after operant performance is established. Adult female rats were derived from litters that were either subjected to neonatal(More)
RATIONALE Previously, we demonstrated that neonatal isolation increases acquisition of cocaine self-administration in adult male rats. OBJECTIVE Now we examine whether neonatal isolation enhances maintenance and cocaine-induced reinstatement of extinguished self-administration behavior. To test the specificity of the effect, a separate study examined(More)