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BACKGROUND Clinical trials indicate that glycine site agonists of the N-methyl-D-aspartate (NMDA) receptors may reduce negative and cognitive symptoms in treatment-resistant schizophrenia when used as adjuvants to conventional antipsychotics but possibly not to clozapine. In this study, we assessed whether high-dose glycine may also be therapeutically(More)
BACKGROUND D-serine, a selective full agonist at the glycine site of N-methyl-D-aspartate glutamate receptor, might presently be the compound of choice for counteracting the hypothesized dysfunction of this receptor class in schizophrenia. Studies performed with Taiwanese patients indicate that D-serine significantly improves schizophrenia symptoms when(More)
OBJECTIVE Altered glycine and homocysteine levels may contribute to N-methyl-D-aspartate receptor dysfunction in schizophrenia. The authors measured plasma levels of these amino acids in a group of patients with chronic schizophrenia and related them to the patients' symptom profiles and types of antipsychotic medication. METHOD Plasma levels of amino(More)
OBJECTIVE The authors investigated the clinical effects of D-cycloserine when added to treatment with conventional neuroleptics, olanzapine, or risperidone for treatment-resistant schizophrenia. METHOD Twenty-four patients participated in a double-blind, placebo-controlled, 6-week crossover trial with D-cycloserine, 50 mg/day, added to their fixed dose of(More)
Prepulse inhibition (PPI) of the startle reflex, a measure of sensorimotor gating, is decreased in schizophrenia. The validity of a glutamatergic, N-methyl-d-aspartate receptor (NMDAR)-mediated model of PPI disruption is presently equivocal. The NMDAR antagonist ketamine disrupts PPI in rodents, but may increase PPI in healthy volunteers. Glycine (GLY),(More)
BACKGROUND The Kraepelinian concept of pfropfschizophrenia refers to the intertwined coexistence of mental retardation and schizophrenia. Patients with this syndrome are relatively treatment resistant and are often harmed by diverging policies and cost cuts within the framework of mental health care services. Thus, a better understanding of this syndrome(More)
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