Abstract
Bipolar disorder (BD) is a severe psychiatric disorder of complex physiopathology that has been associated with a pro-inflammatory state. The aim of the present study was to investigate intracellular pathways associated with inflammatory signaling, assessing the phosphorylation levels of transcription factor nuclear factor kappa B (NF-κB) and mitogen-activated protein kinase (MAPKs) in peripheral blood mononuclear cells of euthymic BD patients and healthy controls. Fifteen BD euthymic type I patients, and 12 healthy controls matched by age and gender were enrolled in this study. All subjects were assessed by the Mini-International Neuropsychiatry Interview and the patients also by the Young Mania Rating Scale and the Hamilton Depression Rating Scale. Phosphorylation levels of p65 NF-κB subunit, and MAPK ERK1/2, and p38 were assessed by Western blot and flow cytometry. Plasma cytokines (IL-2, IL-4, IL6, IL-10, IFN-γ, TNF-α, and IL-17A) were measured using cytometric bead arrays. Western blot and flow cytometry analyses showed increased phosphorylation levels of p65 NF-κB subunit, and MAPKs ERK1/2, and p38 in BD patients in euthymia in comparison with controls. BD patients presented increased pro-inflammatory cytokines levels in comparison with controls, and TNF-α correlated with the levels of phosphorylated p65 NF-κB. The present study found increased activation of MAPK and NF-κB pathways in BD patients, which is in line with a pro-inflammatory status.
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