Elevated dopa decarboxylase activity in living brain of patients with psychosis

J. Reith, C. Benkelfat, A. Sherwin, Y. Yasuhara, Hiroto Kuwabara, F. Andermann, S. Bachneff, P. Cumming, M. Diksic, S. E. Dyve, P. Etienne, A. C. Evans, S. Lal, M. Shevell, G. Savard, Dean Foster Wong, G. Chouinard, A. Gjedde

Research output: Contribution to journalArticle

Abstract

The hypofrontality theory of the pathogenesis of schizophrenia predicts that cortical lesions cause psychosis. During a search for abnormalities of catecholaminergic neurotransmission in patients with complex partial seizures of the mesial temporal lobe, we discovered an increase of the rate of metabolism of an exogenous dopa tracer (6-[18F]fluoro-L-dopa) in the neostriatum of a subgroup of patients with a history of psychosis. When specifically assayed for this abnormality, patients with schizophrenia revealed the same significant increase of the rate of metabolism in the striatum. The finding is consistent with the theory that a state of psychosis arises when episodic dopamine excess is superimposed on a trait of basic dopamine deficiency in the striatum. The finding is explained by the hypothesis that cortical insufficiency, a proposed pathogenetic mechanism of both disorders, causes an up-regulation of the enzymes responsible for dopa turnover in the neostriatum as well as the receptors mediating dopaminergic neurotransmission.

Original languageEnglish (US)
Pages (from-to)11651-11654
Number of pages4
JournalProceedings of the National Academy of Sciences of the United States of America
Volume91
Issue number24
DOIs
StatePublished - Nov 22 1994

Fingerprint

Dopa Decarboxylase
Psychotic Disorders
Neostriatum
Dihydroxyphenylalanine
Synaptic Transmission
Dopamine
Schizophrenia
Brain
Levodopa
Temporal Lobe
Seizures
Up-Regulation
Enzymes

Keywords

  • 6-fluoro-L-dopa
  • dopamine
  • epilepsy
  • positron emission tomography
  • schizophrenia

ASJC Scopus subject areas

  • Genetics
  • General

Cite this

Elevated dopa decarboxylase activity in living brain of patients with psychosis. / Reith, J.; Benkelfat, C.; Sherwin, A.; Yasuhara, Y.; Kuwabara, Hiroto; Andermann, F.; Bachneff, S.; Cumming, P.; Diksic, M.; Dyve, S. E.; Etienne, P.; Evans, A. C.; Lal, S.; Shevell, M.; Savard, G.; Wong, Dean Foster; Chouinard, G.; Gjedde, A.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 91, No. 24, 22.11.1994, p. 11651-11654.

Research output: Contribution to journalArticle

Reith, J, Benkelfat, C, Sherwin, A, Yasuhara, Y, Kuwabara, H, Andermann, F, Bachneff, S, Cumming, P, Diksic, M, Dyve, SE, Etienne, P, Evans, AC, Lal, S, Shevell, M, Savard, G, Wong, DF, Chouinard, G & Gjedde, A 1994, 'Elevated dopa decarboxylase activity in living brain of patients with psychosis', Proceedings of the National Academy of Sciences of the United States of America, vol. 91, no. 24, pp. 11651-11654. https://doi.org/10.1073/pnas.91.24.11651
Reith, J. ; Benkelfat, C. ; Sherwin, A. ; Yasuhara, Y. ; Kuwabara, Hiroto ; Andermann, F. ; Bachneff, S. ; Cumming, P. ; Diksic, M. ; Dyve, S. E. ; Etienne, P. ; Evans, A. C. ; Lal, S. ; Shevell, M. ; Savard, G. ; Wong, Dean Foster ; Chouinard, G. ; Gjedde, A. / Elevated dopa decarboxylase activity in living brain of patients with psychosis. In: Proceedings of the National Academy of Sciences of the United States of America. 1994 ; Vol. 91, No. 24. pp. 11651-11654.
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