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Elevated ubiquitinated proteins in brain and blood of individuals with schizophrenia.

Abstract：

:Dysregulation of the ubiquitin proteasome system (UPS) has been linked to schizophrenia but it is not clear if this dysregulation is detectable in both brain and blood. We examined free mono-ubiquitin, ubiquitinated proteins, catalytic ubiquitination, and proteasome activities in frozen postmortem OFC tissue from 76 (38 schizophrenia, 38 control) matched individuals, as well as erythrocytes from 181 living participants, who comprised 30 individuals with recent onset schizophrenia (mean illness duration = 1 year), 63 individuals with 'treatment-resistant' schizophrenia (mean illness duration = 17 years), and 88 age-matched participants without major psychiatric illness. Ubiquitinated protein levels were elevated in postmortem OFC in schizophrenia compared to controls (p = <0.001, AUC = 74.2%). Similarly, individuals with 'treatment-resistant' schizophrenia had higher levels of ubiquitinated proteins in erythrocytes compared to those with recent onset schizophrenia (p < 0.001, AUC = 65.5%) and controls (p < 0.001, AUC = 69.4%). The results could not be better explained by changes in proteasome activity, demographic, medication, or tissue factors. Our results suggest that ubiquitinated protein formation may be abnormal in both the brain and erythrocytes of those with schizophrenia, particularly in the later stages or specific sub-groups of the illness. A derangement in protein ubiquitination may be linked to pathogenesis or neurotoxicity in schizophrenia, and its manifestation in the blood may have prognostic utility.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Bousman CA,Luza S,Mancuso SG,Kang D,Opazo CM,Mostaid MS,Cropley V,McGorry P,Shannon Weickert C,Pantelis C,Bush AI,Everall IP

doi

10.1038/s41598-019-38490-1

subject

Has Abstract

pub_date

2019-02-19 00:00:00

pages

2307

issue

1

issn

2045-2322

pii

10.1038/s41598-019-38490-1

journal_volume

9

pub_type

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