Cytokines in Schizophrenia: Predisposing Factors and Inflammatory Responses

Abstract

Schizophrenia is a multifactorial disease that may be triggered by environmental disorders, mental stress, or physical illness in a person who is genetically predisposed to it. Recent research has extremely evaluated the role of inflammatory cytokines in schizophrenia. The current study attempted to find any association between cytokines and schizophrenia. This narrative study was conducted through a literature review in Scopus, PubMed, and Web of Science databases using keywords related to schizophrenia and cytokines without any time limitation. This review focused on discussing the relationship between various symptoms of disease and cytokine levels. Environmental factors such as embryonical infections were found to be associated with alternations in mothers’ blood cytokines and further effects on schizophrenia probability in children. Heritable factors including disrupted-in-schizophrenia 1 (DISC1) and neuregulin 1 (NRG1) genes were shown to be linked with immunological responses, as well as Toll-like receptors or AKT1/p13k activation and following alternations in the cytokine profile. Based on the findings, the cytokines and inflammatory responses of the body were reported to be involved in many psychological disorders and schizophrenia. Various interleukins (ILs), as well as IL-6, IL-8, and IL-2R are known to be associated with the severity of schizophrenia symptoms. Although various data exist regarding different cytokines and their association with schizophrenia, no study has so far formulated research fields on specific types of cytokines that have the potential to be further studied for therapeutic hope.