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. 2013 Mar 13;4(3):163–167. doi: 10.1007/s13238-012-2118-2

Regulation of HMGB1 release by inflammasomes

Ben Lu 12118,22118, Haichao Wang 32118, Ulf Andersson 42118, Kevin J Tracey 12118,✉
PMCID: PMC4533838  NIHMSID: NIHMS488454  PMID: 23483477

Abstract

High mobility group box 1 (HMGB1) is an evolutionarily conserved non-histone chromatin-binding protein. During infection or injury, activated immune cells and damaged cells release HMGB1 into the extracellular space, where HMGB1 functions as a proinflammatory mediator and contributes importantly to the pathogenesis of inflammatory diseases. Recent studies reveal that inflammasomes, intracellular protein complexes, critically regulate HMGB1 release from activated immune cells in response to a variety of exogenous and endogenous danger signals. Double stranded RNA dependent kinase (PKR), an intracellular danger-sensing molecule, physically interacts with inflammasome components and is important for inflammasome activation and HMGB1 release. Together, these studies not only unravel novel mechanisms of HMGB1 release during inflammation, but also provide potential therapeutic targets to treat HMGB1-related inflammatory diseases.

Keywords: HMGB1, inflammasome, PKR

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