Abstract
High-mobility group box 1 (HMGB1), a highly conserved non-histone chromosomal protein, was found to act as a potent proinflammatory cytokine and a mediator that participated in the development of systemic inflammatory response. Forty wild type C57BL/6 male (25-30gms) mice were randomly divided into three groups: saline control group; anti-HMGB1 antibody treated group and untreated group. Each group received intratracheal instillation twice per week for 4 consecutive months. 24 hours after the last exposure, anaesthetize the mice with chloral hydrate, bronchoalveolar lavage fluid was collected for cytokines analysis were measured by enzyme linked immunosorbent assay (ELISA). The level of the HMGB1 in lung tissue was determined by real-time PCR and western blot. Lung were fixed with 4% paraformaldehyde for histopathological detection. The serum level of HMGB1 increased after lung injury [peaked 2-5 hr] after lung injury, furthermore this upregulation in HMGB1 associated with increased proinflammatory cytokines [TNF-α, IL-6, IL-1β]. The injection of anti-HMGB1 antibody suppressed inflammatory reaction and improved the survival rate compared with control mice [71.3% vs. 29.4% P=0.031]
Keywords: HMGB1; TNF-α; IL-6; IL-1β; Survival rate
Copyright © 2015 by The American Society for BioMedicine and BM-Publisher, Inc.
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