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The kinase MST4 limits inflammatory responses through direct phosphorylation of the adaptor TRAF6

Shi Jiao1, Zhen Zhang1, Chuanchuan Li1

  • 1National Center for Protein Science Shanghai, State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China.

Nature Immunology
|February 3, 2015
PubMed

Insights

Germinal center kinase MST4 negatively regulates inflammation by inhibiting TRAF6. MST4 phosphorylation of TRAF6 prevents its activation, crucial for controlling immune responses and preventing host damage during infection.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Signaling

Background:

  • Immune responses require strict regulation to prevent excessive inflammation and tissue damage.
  • Dysregulated inflammation is implicated in various pathological conditions.

Purpose of the Study:

  • To investigate the role of germinal center kinase MST4 in regulating inflammatory responses.
  • To elucidate the molecular mechanism by which MST4 controls inflammation, focusing on its interaction with TRAF6.

Main Methods:

  • Investigated MST4's dynamic response to bacterial infection.
  • Examined MST4's direct interaction with and phosphorylation of TRAF6 using biochemical assays.
  • Utilized Traf6 knockout embryonic fibroblasts and a phosphorylation-deficient TRAF6 mutant to assess MST4's inhibitory function.
  • Analyzed inflammatory responses and survival rates in a mouse model of septic shock with MST4 knockdown and Traf6 heterozygous deletion.

Main Results:

  • MST4 was identified as a negative regulator of inflammation, responding dynamically to bacterial infection.
  • MST4 directly phosphorylates TRAF6, preventing its oligomerization and autoubiquitination.
  • MST4's inhibitory effect on lipopolysaccharide-induced cytokine production was dependent on TRAF6 phosphorylation sites.
  • MST4 knockdown in septic shock mice exacerbated inflammation and reduced survival, effects mitigated by Traf6 heterozygous deletion.

Conclusions:

  • MST4 plays a critical role in limiting inflammatory responses through the regulation of TRAF6.
  • The phosphorylation of TRAF6 by MST4 is a key mechanism for controlling inflammation.
  • Targeting MST4 could offer therapeutic strategies for managing inflammatory diseases.

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