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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Therapeutic hypothermia attenuates tissue damage and cytokine expression after traumatic brain injury by inhibiting necroptosis in the rat.
Scientific Reports 2016 April 16
Necroptosis has been shown as an alternative form of cell death in many diseases, but the detailed mechanisms of the neuron loss after traumatic brain injury (TBI) in rodents remain unclear. To investigate whether necroptosis is induced after TBI and gets involved in the neuroprotecton of therapeutic hypothermia on the TBI, we observed the pathological and biochemical change of the necroptosis in the fluid percussion brain injury (FPI) model of the rats. We found that receptor-interacting protein (RIP) 1 and 3, and mixed lineage kinase domain-like protein (MLKL), the critical downstream mediators of necroptosis recently identified in vivo, as well as HMGB1 and the pro-inflammation cytokines TNF-α, IL-6 and IL-18, were increased at an early phase (6 h) in cortex after TBI. Posttraumatic hypothermia (33 °C) led to the decreases in the necroptosis regulators, inflammatory factors and brain tissue damage in rats compared with normothermia-treated TBI animals. Immunohistochemistry studies showed that posttraumatic hypothermia also decreased the necroptosis-associated proteins staining in injured cortex and hippocampal CA1. Therefore, we conclude that the RIP1/RIP3-MLKL-mediated necroptosis occurs after experimental TBI and therapeutic hypothermia may protect the injured central nervous system from tissue damage and the inflammatory responses by targeting the necroptosis signaling after TBI.
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