Kinases Mst1 and Mst2 positively regulate phagocytic induction of reactive oxygen species and bactericidal activity

Jing Geng, Xiufeng Sun, Ping Wang, Shihao Zhang, Xiaozhen Wang, Hongtan Wu, Lixin Hong, Changchuan Xie, Xun Li, Hao Zhao, Qingxu Liu, Mingting Jiang, Qinghua Chen, Jinjia Zhang, Yang Li, Siyang Song, Hong Rui Wang, Rongbin Zhou, Randy L. Johnso, Kun Yi ChienSheng Cai Lin, Jiahuai Han, Joseph Avruch, Lanfen Chen*, Dawang Zhou

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

221 Scopus citations

Abstract

Mitochondria need to be juxtaposed to phagosomes for the synergistic production of ample reactive oxygen species (ROS) in phagocytes to kill pathogens. However, how phagosomes transmit signals to recruit mitochondria has remained unclear. Here we found that the kinases Mst1 and Mst2 functioned to control ROS production by regulating mitochondrial trafficking and mitochondrion-phagosome juxtaposition. Mst1 and Mst2 activated the GTPase Rac to promote Toll-like receptor (TLR)-triggered assembly of the TRAF6-ECSIT complex that is required for the recruitment of mitochondria to phagosomes. Inactive forms of Rac, including the human Rac2 D57N mutant, disrupted the TRAF6-ECSIT complex by sequestering TRAF6 and substantially diminished ROS production and enhanced susceptibility to bacterial infection. Our findings demonstrate that the TLR-Mst1-Mst2-Rac signaling axis is critical for effective phagosome-mitochondrion function and bactericidal activity.

Original languageEnglish
Pages (from-to)1142-1152
Number of pages11
JournalNature Immunology
Volume16
Issue number11
DOIs
StatePublished - 20 10 2015

Bibliographical note

Publisher Copyright:
© 2015 Nature America, Inc.

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