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Mitochondrial involvement in schizophrenia and other functional psychoses

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Abstract

Gene expression has been studied in post-mortem frontal cortex samples from patients who had suffered from schizophrenia and depressive illness. mRNA was extracted and characterised by translation and separation of the products by 2D gel electrophoresis. Post-mortem artefacts and the agonal experience did not affect the size distribution or amount of specific translation products. Four expression products were specifically reduced in samples from schizophrenics compared with normals. The expression of six products was altered in affective disorder, one in common with schizophrenia, two the same as schizophrenia but increased. cDNA libraries were produced from the mRNA samples and 5 clones present at abnormal levels in schizophrenia identified by differential screening, isolated and sequenced. All the sequences encode mitochondrial transcripts; four encode mitochondrial rRNA and one the amino acid sequence of cytochrome oxidase sub-unit II. Increased cytochrome oxidase transcripts were found in a further set of mRNA extracts from schizophrenic patients including two who had not received neuroleptic medication. The effects of neuroleptic administration as exemplified by α-flupenthixol compared with the ineffective β-flupenthixol were studied in experimental animals. It was found that 13 out of 28 clones whose levels were altered were mitochondrial in origin including rRNA, COX I & II and the NADH-Q reductase. Those encoding respiratory enzymes were at abnormally low levels as a result of α-flupenthixol administration. Measurements of the enzymic activity of cytochrome c oxidase in post-mortem frontal cortex of schizophrenics did not indicate any differences in overall activity but there was a decreased sensitivity to azide that was abolished by neuroleptics. Studies on NADH-cytochrome c reductase showed that schizophrenics whether medicated or not had a reduced rotenone sensitive activity that was compensated for by increased rotenone insensitive activity. We conclude that changes in mitochondrial gene expression are involved in schizophrenia and probably other functional psychoses.

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Authors and Affiliations

  1. Department of Neuroscience, Institute of Psychiatry, Denmark Hill, SE5 8AF, London, UK

    S. A. Whatley & R. M. Marchbanks

  2. Istituto di Farmacologia, Universita di Pavia, Piazza Botta 11, 27100, Pavia, Italy

    D. Curti

Authors
  1. S. A. Whatley
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  2. D. Curti
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  3. R. M. Marchbanks
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Special issue dedicated to Dr. Herman Bachelard.

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Whatley, S.A., Curti, D. & Marchbanks, R.M. Mitochondrial involvement in schizophrenia and other functional psychoses. Neurochem Res 21, 995–1004 (1996). https://doi.org/10.1007/BF02532409

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