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Synaptic density marker SV2A is reduced in schizophrenia patients and unaffected by antipsychotics in rats

Research output: Contribution to journalArticle

Ellis Chika Onwordi, Els F. Halff, Thomas Whitehurst, Ayla Mansur, Marie-Caroline Cotel, Lisa A Wells, Hannah Creeney, David R. Bonsall, Maria Rogdaki, Eugenii Rabiner, Sridhar Natesan, Tiago Reis Marques, Roger N. Gunn, Ekaterina Shatalina, Anthony Christopher Vernon, Oliver David Howes

Original languageEnglish
Article number246
Pages (from-to)1-11
Number of pages11
JournalNature Communications
Volume11
Issue number1
DOIs
Publication statusPublished - 14 Jan 2020

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Abstract

Synaptic dysfunction is hypothesised to play a key role in schizophrenia pathogenesis, but this has not been tested directly in vivo. Here, we investigated synaptic vesicle glycoprotein 2A (SV2A) levels and their relationship to symptoms and structural brain measures using [11C]UCB-J positron emission tomography in 18 patients with schizophrenia and 18 controls. We found significant group and group-by-region interaction effects on volume of distribution (VT). [11C]UCB-J VT was significantly lower in the frontal and anterior cingulate cortices in schizophrenia with large effect sizes (Cohen's d = 0.8-0.9), but there was no significant difference in the hippocampus. We also investigated the effects of antipsychotic drug administration on SV2A levels in Sprague-Dawley rats using western blotting, [3H]UCB-J autoradiography and immunostaining with confocal microscopy, finding no significant effects on any measure. These findings indicate that there are lower synaptic terminal protein levels in schizophrenia in vivo and that antipsychotic drug exposure is unlikely to account for them.

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