Effects of Hyperbaric Oxygen Therapy on Inflammasome Signaling after Traumatic Brain Injury

Objective: Neuroinflammation plays an important role in secondary tissue damage after traumatic brain injury (TBI). Recently, the inflammasome-mediated inflammatory pathway has been observed in the inflammatory response of TBI. In this study, we investigated the influence of hyperbaric oxygen therapy (HBOT) on inflammasome activation after TBI. Methods: The experimental mice were randomly divided into 4 groups as follows: sham-operated normobaric air (21% O-2 at one absolute atmosphere), HBOT only, TBI + normobaric air and TBI + HBOT. Following the evaluation of motor deficits and brain edema, the expression of inflammasome components and effectors was measured by qRT-PCR and Western blotting. Moreover, alterations in IL-1 beta, IL-18 and high-mobility group box 1 (HMGB1) were calculated by enzyme-linked immunosorbent assay at each time point after injury. Results: HBOT improved motor score and reduced brain edema. Furthermore, it suppressed protein expression of inflammasome components and reduced the levels of IL-1 beta and IL-18, accompanied by the reduction of HMGB1 in brain tissues and serum. Conclusion: These results suggest that HBOT may alleviate the inflammatory response after TBI by inhibiting the activation of inflammasome signaling. (C) 2016 S. Karger AG, Basel