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• W2520908617 abstract "High mobility group box 1 (HMGB1) has been implicated as a key factor in several neuroinflammatory conditions. Our previous study suggested that the release of central HMGB1 acts as a late-phase mediator in lipopolysaccharide (LPS)-induced depression. Recent findings indicate that the redox state of HMGB1 is a critical determinant of its immunomodulatory properties. Here, we aimed to investigate the potential mechanisms that link the redox states of HMGB1 to depression in mice. Distinct redox forms of recombinant HMGB1 (rHMGB1) were used that included fully reduced HMGB (fr-HMGB1), which acted as a chemokine, and disulfide-HMGB1 (ds-HMGB1), which possessed cytokine activity. Fr-HMGB1 in vivo was partially oxidized into ds-HMGB1; thus, the mutant protein non-oxidizable chemokine-HMGB (nonoxid-HMGB1) was applied. Concurrent with depressive behavior induced by four-week stress exposure, the HMGB1 concentrations in the serum and cerebral cortex substantially increased. Therefore, a single dose of rHMGB1 (200ng/5μl/mice) or vehicle was administered to mice via intracerebroventricular (i.c.v.) injection. The receptor inhibitors of TLR4/RAGE/CXCR4 (TAK-242/FPS-ZM1/AMD3100) (3mg/kg) were intraperitoneally injected 30min prior to rHMGB1 treatment. Depressive-like behavior was measured 20h post i.c.v. injection. Administration of fr-HMGB1 prolonged the immobility duration in the tail suspension test (TST) and decreased sucrose preference. In addition to depressive behavior, the hippocampal TNF-α protein slightly increased. These depressive behaviors and upregulation of hippocampal TNF-α were alleviated or abrogated by pretreatment with the inhibitors AMD3100, FPS-ZM1, and TAK-242. Alternatively, nonoxid-HMGB1 failed to induce TNF-α protein or prolong the immobility duration. As expected, ds-HMGB1 administration substantially upregulated hippocampal TNF-α protein, increased the immobility time in the TST and decreased sucrose preference. Moreover, both glycyrrhizin and TAK-242 improved ds-HMGB1-induced depressive behavior. Furthermore, TAK-242 significantly blocked the upregulation of hippocampal TNF-α protein and protected hippocampal myelin basic protein from ds-HMGB1-induced reduction. These drugs had no effect on the total or central distance in the open field test. Collectively, this initial experiment demonstrates the role and receptor mechanisms of HMGB1 under different redox states on the induction of depressive-like behavior. Both ds-HMGB1 and fr-HMGB1 may induce depressive-like behavior in vivo mainly via neuroinflammatory response activation." @default.
• W2520908617 created "2016-09-23" @default.
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• W2520908617 date "2017-01-01" @default.
• W2520908617 modified "2023-10-18" @default.
• W2520908617 title "Ds-HMGB1 and fr-HMGB induce depressive behavior through neuroinflammation in contrast to nonoxid-HMGB1" @default.
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• W2520908617 doi "https://doi.org/10.1016/j.bbi.2016.09.017" @default.
• W2520908617 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27647532" @default.
• W2520908617 hasPublicationYear "2017" @default.
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