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PKA regulatory IIα subunit is essential for PGD2-mediated resolution of inflammation

Deping Kong1, Yujun Shen2, Guizhu Liu1

  • 1Key Laboratory of Food Safety Research, CAS Center for Excellence in Molecular Cell Science, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China.

The Journal of Experimental Medicine
|September 14, 2016
PubMed

Insights

Prostaglandin D2 receptor 1 (DP1) activation on macrophages promotes anti-inflammatory M2 polarization and tissue repair after myocardial infarction (MI). DP1 signaling resolves inflammation by suppressing M1 polarization via PRKAR2A and JAK2/STAT1 pathways.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cardiovascular Research

Background:

  • Macrophage polarization (M1/M2) is crucial for resolving inflammation and healing after myocardial infarction (MI).
  • The precise molecular mechanisms governing the M1-to-M2 phenotype transition remain incompletely understood.

Purpose of the Study:

  • To elucidate the role of prostaglandin (PG) D2 receptor 1 (DP1) in macrophage polarization and inflammatory resolution.
  • To investigate the signaling pathways involved in DP1-mediated macrophage responses.

Main Methods:

  • Utilized genetic deletion models of DP1 and PRKAR2A in macrophages.
  • Analyzed gene expression, cytokine production, and inflammatory resolution in various models, including a myocardial infarction model.
  • Investigated the interaction between PRKAR2A, IFN-γ receptor, and JAK2/STAT1 signaling.

Main Results:

  • DP1 deletion in macrophages impaired M2 polarization, anti-inflammatory cytokine production, and resolution in inflammatory models, including MI.
  • DP1 deletion upregulated pro-inflammatory genes via JAK2/STAT1 signaling.
  • DP1 activation promoted M2 polarization and resolution by facilitating PRKAR2A binding to the IFN-γ receptor, suppressing the JAK2-STAT1 pathway.
  • PRKAR2A deficiency abrogated DP1-mediated M2 polarization and resolution.

Conclusions:

  • The PGD2-DP1 axis drives M2 polarization, facilitating inflammation resolution through PRKAR2A-mediated suppression of JAK2/STAT1 signaling.
  • Macrophage DP1 activation is a potential therapeutic strategy for inflammation-associated diseases, including post-MI healing.

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