Antipsychotic drug effects on left prefrontal phospholipid metabolism: A follow-up 31P-2D-CSI study of haloperidol and risperidone in acutely ill chronic schizophrenia patients

Schizophrenia Research, 04/23/2012

Risperidone seems to stimulate neuronal and synaptic phospholipid remodeling in left frontal and prefrontal regions, and to a lesser extent also in temporal and insular cortices. The authors discuss these effects with respect to clinical effects on negative and cognitive symptoms, as well as interaction of phospholipid metabolism with glutamatergic neurotransmission.

Methods

  • The authors applied 2D-CSI MR spectroscopy in 17 recurrent-episode schizophrenia patients off antipsychotics at baseline and at follow-up after 6weeks, during which 7 patients were treated with haloperidol (10–16mg/d) and 10 with risperidone (4–6mg/d).
  • Psychopathology changes were assessed using PANSS, BPRS and CGI scores.

Results

  • Follow-up analysis using repeated measure ANOVA revealed different effects of both antipsychotic agents: while risperidone generally increased metabolite levels, haloperidol showed a tendency to decrease them.
  • This diverging effect was significant for ATP levels in the left lateral frontal cortex.
  • Furthermore, risperidone increased ATP in the left dorsolateral prefrontal cortex, left anterior temporal cortex and left insular cortex, basal ganglia, and anterior cerebellum, along with left frontal and prefrontal increase of PCr, PDE and PME in these brain regions.

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