Antipsychotics

769 Words2 Pages

Cognitive deficits represent a particularly important point of intervention for the treatment of schizophrenia, a debilitating psychiatric disease that affects approximately 1% of the population (McGrath et al., 2008). These deficits are present in unmedicated (Saykin et al., 1991) and first episode patients with schizophrenia (Bilder et al., 1991; Hoff et al., 2005). Cognitive deficits are present throughout the lifetime of a patient with schizophrenia (Aylward et al., 1984) and remain stable through at least 10 years of illness (Hoff et al., 2005). Amelioration of the cognitive deficits, more than positive and negative symptoms, predict a satisfactory functional outcome in terms of full time employment and therefore represent an important target for therapeutic intervention (Green, 1996; Green, 2006). However, current typical antipsychotics generate little if any improvement in cognitive deficits in schizophrenia and therefore novel compounds are needed as indicated by the initiative sponsored by the National Institute of Mental Health called Measurement and Treatment Research to Improve Cognition in Schizophrenia (MATRICS) (Keefe et al., 2007; Young et al., 2009).

The MATRICS initiative details many animal models of schizophrenia for the purpose of investigating novel compounds with therapeutic efficacy toward the cognitive deficits of schizophrenia. N-methyl-D-aspartate (NMDA) receptor noncompetitive antagonists are appropriate compounds utilized in order to model schizophrenia based on the evidence that pharmacological agents that block the NMDA receptor calcium channel, such as phencyclidine (PCP), ketamine, and MK-801, produce positive and negative symptoms along with cognitive deficits in healthy volunteers, in addi...

... middle of paper ...

...osage after menopause (Seeman, 1983). Moreover, women have more severe psychotic symptoms when estrogen levels are low such as during the low-estrogen phases of the menstrual cycle, during menopause, and the postpartum period (Seeman, 1996). When the estrogen estradiol has been administered in conjunction with an atypical antipsychotic, estradiol reduced positive and negative symptoms and also improved the cognitive deficits in women with schizophrenia (Kulkani et al., 1996, Lindamer et al., 2001, Kulkarni et al., 2001, Kulkarni et al., 2008).

In the current study, we investigated whether 17-β estradiol, an estrogen, could reverse the phencyclidine-induced deficits in the NORT in female rats. We report that chronic estradiol treatment alleviated the sub-chronic PCP induced deficits in the NORT in ovariectomized female rats both therapeutically and protectively.

Open Document