Abnormalities of oligodendrocyte clusters in supra- and infragranular layers of the prefrontal cortex in schizophrenia

Kolomeets N.S.; Vostrikov V.M.; Uranova N.A.

doi:https://doi.org/10.17116/jnevro201911912162

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Abstract:

Objective. A deficit of cortical gray matter myelination in the frontal lobes has been reported in schizophrenia in neuroimaging studies. Previously the decrease in the numerical density (Nv) of oligodendrocytes (NvOl) in layers 3 and 5 in area 10 of the prefrontal cortex (PFC) has been reported in schizophrenia. Oligodendrocyte progenitors proliferate in the adult human brain and form oligodendrocyte clusters for functional-dependent adaptive myelination. We aimed to estimate the NvOl and Nv of oligodendrocyte clusters (NvOlC) in supra- and infragranular sublayers of the PFC in schizophrenia and healthy controls. Material and methods. 17 chronic schizophrenia subjects and 20 healthy matched controls were studied in Nissl-stained sections in sublayers 3a- 3c and 5a of the PFC by stereological optical dissector method. Results and conclusion. The NvOl and the NvOlC were significantly decreased in supra- (32%, p<0.02) and infragranular sublayers (50%, p<0.001) of the PFC in the schizophrenia group as compared to controls. The Nv OlC/Nv Ol ratio decreased significantly in the schizophrenia group only in sublayers 3a (p=0.015) and 5a (p<0.001). In the control group, the NvOlC was positively correlated with the NvOl in sublayers 3b, 3c and 5a (R≥0.59; p≤0.006). In the schizophrenia group, a significant correlation between the parameters was found only in sublayer 5a (R=0.8; p<0.001). The deficit of oligodendrocyte clusters might be associated with altered proliferation and/or maturation of oligodendrocyte progenitors in schizophrenia. Specific alterations of the Nv OlC/Nv Ol ratio might be due to different connectivity of supra- and infragranular sublayers of the PFC and their disturbances in schizophrenia.

Keywords:

schizophrenia

oligodendrocyte clusters

prefrontal cortex

morphometry

Authors:

Kolomeets N.S.

Nauchnyĭ tsentr psikhicheskogo zdorov'ia RAMN, Moskva

Vostrikov V.M.

FGBU "Nauchnyĭ tsentr psikhicheskogo zdorov'ia" RAMN, Moskva

Uranova N.A.

Nauchnyĭ tsentr psikhicheskogo zdorov'ia RAMN, Moskva

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