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IL-10 signaling modulates PRKN methylation and influences STAT3 activity to drive regulatory macrophage

Lihuan Wang1, Lingzhi Xu2, Shuo Song3

  • 1Department of Allergy Medicine & Pulmonary and Critical Care Medicine, Third Hospital of Shanxi Medical University, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Taiyuan, China.

Biochimica Et Biophysica Acta. Molecular Basis of Disease
|December 29, 2024
PubMed

Insights

Inhibition of PRKN (E3 ubiquitin protein ligase) increases regulatory macrophages (Mregs), suppressing airway allergy. This finding offers potential therapeutic strategies for immune disorders.

Area of Science:

  • Immunology
  • Molecular Biology
  • Allergy Research

Background:

  • Immune disorders often involve regulatory macrophage dysfunction, but the underlying mechanisms remain unclear.
  • Regulatory macrophages (Mregs) play a crucial role in immune homeostasis and suppressing excessive immune responses.
  • Understanding how Mreg development is controlled is vital for developing treatments for immune-related diseases.

Purpose of the Study:

  • To investigate the mechanism by which PRKN (E3 ubiquitin protein ligase) inhibits the development of regulatory macrophages (Mregs).
  • To explore the role of PRKN in the context of airway allergy (AA) pathogenesis.
  • To determine the translational potential of targeting Mreg regulation for immune disorder treatment.

Main Methods:

  • Establishment of an airway allergy (AA) mouse model using dust mite antigens.
  • Isolation and analysis of airway macrophages using flow cytometry cell sorting.
  • Assessment of Mreg function, Th2 polarization suppression, and STAT3 (signal transducer and transcriptional activator-3) ubiquitination status.

Main Results:

  • Prkn gene inhibition significantly increased the number of Mregs in airway macrophages.
  • Mregs derived from Prkn-deficient macrophages showed enhanced suppression of Th2 polarization, with IL-10 playing a critical role.
  • PRKN was found to be essential for maintaining the hyperubiquitination of STAT3 in macrophages, and its inhibition mitigated experimental AA.
  • IL-10 suppressed PRKN expression via promoter hypermethylation, while PRKN inhibited IL-10 expression.

Conclusions:

  • PRKN maintains STAT3 hyperubiquitination and restricts IL-10 expression in macrophages, thereby compromising their immune suppressive functions.
  • Inhibition of PRKN promotes Mreg development and ameliorates airway allergy.
  • Targeting Mreg regulation, specifically through PRKN inhibition, holds promise for treating immune disorders like AA.
Keywords:
Airway allergyEpigeneticsIL-10Immune regulationMacrophageUbiquitination

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