Hectd3 promotes pathogenic Th17 lineage through Stat3 activation and Malt1 signaling in neuroinflammation

Jonathan J. Cho, Zhiwei Xu, Upasana Parthasarathy, Theodore T. Drashansky, Eric Y. Helm, Ashley N. Zuniga, Kyle J. Lorentsen, Samira Mansouri, Joshua Y. Cho, Mariola J. Edelmann, Duc M. Duong, Torben Gehring, Thomas Seeholzer, Daniel Krappmann, Mohammad N. Uddin, Danielle Califano, Rejean L. Wang, Lei Jin, Hongmin Li, Dongwen LvDaohong Zhou, Liang Zhou, Dorina Avram

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Polyubiquitination promotes proteasomal degradation, or signaling and localization, of targeted proteins. Here we show that the E3 ubiquitin ligase Hectd3 is necessary for pathogenic Th17 cell generation in experimental autoimmune encephalomyelitis (EAE), a mouse model for human multiple sclerosis. Hectd3-deficient mice have lower EAE severity, reduced Th17 program and inefficient Th17 cell differentiation. However, Stat3, but not RORγt, has decreased polyubiquitination, as well as diminished tyrosine-705 activating phosphorylation. Additionally, non-degradative polyubiquitination of Malt1, critical for NF-κB activation and Th17 cell function, is reduced. Mechanistically, Hectd3 promotes K27-linked and K29-linked polyubiquitin chains on Malt1, and K27-linked polyubiquitin chains on Stat3. Moreover, Stat3 K180 and Malt1 K648 are targeted by Hectd3 for non-degradative polyubiquitination to mediate robust generation of RORγt + IL-17A hi effector CD4 + T cells. Thus, our studies delineate a mechanism connecting signaling related polyubiquitination of Malt1 and Stat3, leading to NF-kB activation and RORγt expression, to pathogenic Th17 cell function in EAE.

Original languageEnglish (US)
Article number701
JournalNature communications
Volume10
Issue number1
DOIs
StatePublished - Dec 1 2019
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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