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Psychiatry Investig > Epub ahead of print
[Epub ahead of print]
DOI: https://doi.org/10.30773/pi.2018.12.19.1    Published online March 7, 2019.
Peripheral Biomarkers for First-Episode Psychosis—Opportunities from the Neuroinflammatory Hypothesis of Schizophrenia
Nuno Trovão1,2,3, Joana Prata1,2,3, Orlando VonDoellinger2,4, Susana Santos2,5, Mário Barbosa2,5,6, Rui Coelho2,3
1Department of Psychiatry, Vila Nova de Gaia/ Espinho Hospital Center, Vila Nova de Gaia, Portugal
2Instituto de Investigação e Inovação em Saúde, University of Porto, Porto, Portugal
3Department of Psychiatry, Faculty of Medicine of University of Porto, Porto, Portugal
4Department of Psychiatry, Tâmega e Sousa Hospital Center, Penafiel, Portugal
5Instituto de Engenharia Biomédica, University of Porto, Porto, Portugal
6Instituto de Ciências Biomédicas Abel Salazar, University of Porto, Porto, Portugal
Correspondence: Nuno Trovão ,Tel: +351914691409, Fax: +351227865174, Email: nuno.trovao@chvng.min-saude.pt
Received: September 7, 2018   Revised: December 18, 2018   Accepted: December 19, 2018   Published online: March 7, 2019
Abstract

Objective
Schizophrenia is a disabling disorder of unknown aetiology, lacking definite diagnostic method and cure. A reliable biological marker of schizophrenia is highly demanded, for which traceable immune mediators in blood could be promising candidates. We aimed to gather the best findings of neuroinflammatory markers for first-episode psychosis (FEP).
Methods
We performed an extensive narrative review of online literature on inflammation-related markers found in human FEP patients only.
Results
Changes to cytokine levels have been increasingly reported in schizophrenia. The peripheral levels of IL-1 (or its receptor antagonist), soluble IL-2 receptor, IL-4, IL-6, IL-8, and TNF-α have been frequently reported as increased in FEP, in a suggestive continuum from high-risk stages for psychosis. Microglia and astrocytes establish the link between this immune signalling and the synthesis of noxious tryptophan catabolism products, that cause structural damage and directly hamper normal neurotransmission. Amongst these, only 3-hydroxykynurenine has been consistently described in the blood of FEP patients.
Conclusion
Peripheral molecules stemming from brain inflammation might provide insightful biomarkers of schizophrenia, as early as FEP or even prodromal phases, although more time- and clinically-adjusted studies are essential for their validation.
Key words   Immune, Neuroinflammation, Schizophrenia, First-episode psychosis, Biomarkers
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