Yann Quidé1,2, Chiara C Bortolasci3, Briana Spolding3, Srisaiyini Kidnapillai3, Oliver J Watkeys1,2, Sarah Cohen-Woods4, Michael Berk5,6,7,8, Vaughan J Carr1,2,9, Ken Walder3, Melissa J Green1,2. 1. School of Psychiatry, University of New South Wales, Sydney, NSW, Australia. 2. Neuroscience Research Australia, Randwick, NSW, Australia. 3. Centre for Molecular and Medical Research, School of Medicine, Deakin University, Geelong, VIC, Australia. 4. School of Psychology, Flinders University, Adelaide, SA, Australia. 5. Department of Psychiatry, University of Melbourne, Parkville, VIC, Australia. 6. Florey Institute for Neuroscience and Mental Health, Parkville, VIC, Australia. 7. Orygen, The National Centre of Excellence in Youth Mental Health, Parkville, VIC, Australia. 8. Deakin University, Impact Strategic Research Centre, Barwon Health, Geelong, VIC, Australia. 9. Department of Psychiatry, School of Clinical Sciences, Monash University, Clayton, VIC, Australia.
Abstract
BACKGROUND: Elevated levels of pro-inflammatory cytokines are consistently reported in schizophrenia (SZ) and bipolar-I disorder (BD), as well as among individuals who have been exposed to childhood trauma. However, higher levels of inflammatory markers in these disorders are yet to be investigated with respect to levels of exposure to different types of childhood trauma. METHODS: Participants were 68 cases with a diagnosis of schizophrenia/schizoaffective disorder (SZ), 69 cases with a diagnosis of psychotic BD and 72 healthy controls (HC). Serum levels of interleukin 6 (IL-6), tumour necrosis factor-α (TNF-α) and C-reactive protein (CRP) were quantified, and childhood trauma exposure was assessed with the Childhood Trauma Questionnaire. RESULTS: The SZ group had significantly higher levels of IL-6, TNF-α and CRP when compared with the HC group (all p < 0.05, d = 0.41-0.63), as well as higher levels of TNF-α when compared with the BD group (p = 0.014, d = 0.50); there were no differences between the BD and HC groups for any markers. Exposure to sexual abuse was positively associated (standardised β = 0.326, t = 2.459, p = 0.018) with levels of CRP in the SZ group, but there were no significant associations between any form of trauma exposure and cytokine levels in the HC or BD groups. CONCLUSIONS: These results contribute to the evidence for a chronic state of inflammation in SZ but not BD cases. Differential associations between trauma exposure and levels of pro-inflammatory cytokines across the diagnostic categories suggest that trauma may impact biological (stress and immune) systems differently in these patient groups.
BACKGROUND: Elevated levels of pro-inflammatory cytokines are consistently reported in schizophrenia (SZ) and bipolar-I disorder (BD), as well as among individuals who have been exposed to childhood trauma. However, higher levels of inflammatory markers in these disorders are yet to be investigated with respect to levels of exposure to different types of childhood trauma. METHODS:Participants were 68 cases with a diagnosis of schizophrenia/schizoaffective disorder (SZ), 69 cases with a diagnosis of psychotic BD and 72 healthy controls (HC). Serum levels of interleukin 6 (IL-6), tumour necrosis factor-α (TNF-α) and C-reactive protein (CRP) were quantified, and childhood trauma exposure was assessed with the Childhood Trauma Questionnaire. RESULTS: The SZ group had significantly higher levels of IL-6, TNF-α and CRP when compared with the HC group (all p < 0.05, d = 0.41-0.63), as well as higher levels of TNF-α when compared with the BD group (p = 0.014, d = 0.50); there were no differences between the BD and HC groups for any markers. Exposure to sexual abuse was positively associated (standardised β = 0.326, t = 2.459, p = 0.018) with levels of CRP in the SZ group, but there were no significant associations between any form of trauma exposure and cytokine levels in the HC or BD groups. CONCLUSIONS: These results contribute to the evidence for a chronic state of inflammation in SZ but not BD cases. Differential associations between trauma exposure and levels of pro-inflammatory cytokines across the diagnostic categories suggest that trauma may impact biological (stress and immune) systems differently in these patient groups.
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