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- W3012863670 abstract "Abstract Background In the last decade, there has been growing evidence that an interaction exists between inflammation and the kynurenine pathway in schizophrenia. Additionally, many authors found microglial activation in cases of schizophrenia due to inflammatory mechanisms related mostly to an increase of pro-inflammatory cytokines. In order to gain new insights into the pathophysiology of schizophrenia, it is important to incorporate the latest published evidence concerning inflammatory mechanisms and kynurenine metabolism. This systematic review aims to collect reliable recent findings within the last decade supporting such a theory. Methods A structured search of electronic databases was conducted for publications between 2008 and 2018 to identify eligible studies investigating patients with schizophrenia/psychosis and the relationship between inflammation and kynurenine pathway. Applicable studies were systematically scored using the NIH Quality Assessment Tools. Two researchers independently extracted data on diagnosis (psychosis/schizophrenia), inflammation, and kynurenine/tryptophan metabolites. Results Ten eligible articles were identified where seven studies assessed blood samples and three assessed cerebrospinal fluid in schizophrenic patients. Of these articles: Four investigated the relationship between immunoglobulins and the kynurenine pathway and found correlations between IgA-mediated responses and levels of tryptophan metabolites (i.e., kynurenine pathway). Five examined the correlation between cytokines and kynurenine metabolites where three showed a relationship between elevated IL-6, TNF-α concentrations, and the kynurenine pathway. Only one study discovered correlations between IL-8 and the kynurenine pathway. Two studies showed correlations with lower concentrations of IL-4 and the kynurenine pathway. Moreover, this systematic review did not find a significant correlation between CRP ( n = 1 study), IFN-γ ( n = 3 studies), and the kynurenine pathway in schizophrenia. Interpretation These results emphasize how different inflammatory markers can unbalance the tryptophan/kynurenine pathway in schizophrenia. Several tryptophan/kynurenine pathway metabolites are produced which can, in turn, underlie different psychotic and cognitive symptoms via neurotransmission modulation. However, due to heterogeneity and the shortage of eligible articles, they do not robustly converge to the same findings. Hence, we recommend further studies with larger sample sizes to elucidate the possible interactions between the various markers, their blood vs. CSF ratios, and their correlation with schizophrenia symptoms." @default.
- W3012863670 created "2020-03-27" @default.
- W3012863670 creator A5000245598 @default.
- W3012863670 creator A5001648943 @default.
- W3012863670 creator A5026610554 @default.
- W3012863670 creator A5057718747 @default.
- W3012863670 date "2020-02-15" @default.
- W3012863670 modified "2023-10-18" @default.
- W3012863670 title "Effects of inflammation on the kynurenine pathway in schizophrenia — a systematic review" @default.
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