At a glance
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Acute Glycine Pharmacodynamic Study
In Brief
A clinical study evaluating Glycine administration for Schizophrenia and Psychotic Disorders. Completed, enrolled 21 participants across 1 site.
Detailed Summary
The purpose of this study is to use proton magnetic resonance spectroscopy (MRS) at 4 Tesla to measure brain glycine levels noninvasively at baseline and for 2 hours after a single oral dose of a concentrated glycine-containing beverage, and to compare MRS glycine measurements to glycine blood levels in samples obtained after each MRS spectrum. The investigators hypothesize that they will observe a high correlation between the magnitude increases in brain and plasma glycine levels over this time frame. The investigators also hypothesize that we will observe large intersubject variability in glycine uptake rates into brain and blood. The investigators also hypothesize that subjects with a glycine decarboxylase (GLDC) mutation (triplication) will have lower baseline plasma and brain glycine levels and will experience smaller brain and plasma glycine increases after glycine consumption than controls or family members without the GLDC mutation.
Study Details
Timeline
Interventions
Glycine will be administered once as a 250 cc lemon-flavored beverage based on each subject's body weight. The drink concentration will be 0.4 g/kg glycine (not to exceed 30 grams). Subjects will have 10 minutes to consume the beverage.