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Monocyte count in schizophrenia and related disorders: a systematic review and meta-analysis

Published online by Cambridge University Press:  17 March 2020

Mario Gennaro Mazza Open the ORCID record for Mario Gennaro Mazza [Opens in a new window] ,
Martina Capellazzi ,
Sara Lucchi ,
Ilaria Tagliabue ,
Aurora Rossetti  and
Massimo Clerici
Mario Gennaro Mazza*
Affiliation:
Department of Medicine and Surgery, University of Milano Bicocca, Monza, MB, Italy
Martina Capellazzi
Affiliation:
Department of Medicine and Surgery, University of Milano Bicocca, Monza, MB, Italy
Sara Lucchi
Affiliation:
Department of Medicine and Surgery, University of Milano Bicocca, Monza, MB, Italy
Ilaria Tagliabue
Affiliation:
Department of Medicine and Surgery, University of Milano Bicocca, Monza, MB, Italy
Aurora Rossetti
Affiliation:
Department of Medicine and Surgery, University of Milano Bicocca, Monza, MB, Italy
Massimo Clerici
Affiliation:
Department of Medicine and Surgery, University of Milano Bicocca, Monza, MB, Italy
*
Author for correspondence: Mario Gennaro Mazza, Email: m.mazza31@campus.unimib.it
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Abstract

Objective:

Increasing evidence suggests that immunological and inflammatory dysfunctions may play an important role in predisposition, onset, and progression of schizophrenia and related psychosis. The activation of cells of the mononuclear phagocyte system, especially microglia and monocytes, has been reported in schizophrenia. We carried out this systematic review and meta-analysis to investigate if there are significant differences in monocyte count comparing healthy controls with people suffering from schizophrenia and related disorders.

Methods:

We searched main electronic databases; nine records met all our criteria and were included in the meta-analysis. Meta-analyses based on random effects models have been carried out generating pooled standardised mean differences (SMDs) of monocyte count in peripheral blood between schizophrenia and related psychosis and healthy controls. Heterogeneity was estimated. Relevant sensitivity and subgroup analyses were conducted.

Results:

Patients showed higher monocyte count as compared with healthy control (SMD = 0.393; p = 0.001). Heterogeneity across studies was from moderate to high (I2 = 65.952%); sensitivity analysis leaving out two studies responsible for most of the heterogeneity showed a slightly higher SMD. Subgroup analyses confirmed this result, showing no significant differences in the effect size across different study characteristics.

Conclusions:

Monocyte count can be considered an indirect marker of microglia activation in the central nervous system. Thus, the observed higher monocyte count in patients could be considered as a possible peripheral marker of microgliaʼs activation in schizophrenia disorder.

Keywords

meta-analysisschizophreniamonocytesmicrogliainflammation
Type
Review Article
Information
Acta Neuropsychiatrica , Volume 32 , Issue 5 , October 2020 , pp. 229 - 236
Copyright
© Scandinavian College of Neuropsychopharmacology 2020

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