GEF-H1 upon microtubule destabilization drives ZBP1-dependent necroptosis
Xufei Zhang1,2, Xuanheng Li3, Yiyu Yang2
1Department of General Surgery, Nanjing Drum Tower Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing, China.
None:
It remains unclear for the role of microtubule-associated proteins or signaling in necroptosis. Here, we conducted high-throughput screening using a cytoskeleton compound library and identified that release of guanine nucleotide exchange factor-H1 (GEF-H1) upon microtubule destabilization triggers necroptosis. Immunoprecipitation and mass spectrometry revealed that GEF-H1 interacts with DExH-Box helicase 9 (DHX9) and protein-protein interaction network analysis indicated DHX9 is associated with necroptosis. Deficiency of either GEF-H1 or DHX9 significantly inhibits necroptosis. Mechanistically, upon microtubule destabilization, GEF-H1 is translocated to the nucleus and recruits DHX9 and RNA Pol II to the Z-DNA binding protein 1 (ZBP1) promoter region. Subsequently, increasing expression of ZBP1 drives necroptosis. In addition, GEF-H1 signaling upon microtubule destabilization also plays a positive role in lipopolysaccharide-induced cell death and inflammation. Collectively, these findings uncover an important role for GEF-H1 signaling in necroptosis and inflammation.
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