eLife (Mar 2021)

Wnt signaling enhances macrophage responses to IL-4 and promotes resolution of atherosclerosis

  • Ada Weinstock,
  • Karishma Rahman,
  • Or Yaacov,
  • Hitoo Nishi,
  • Prashanthi Menon,
  • Cyrus A Nikain,
  • Michela L Garabedian,
  • Stephanie Pena,
  • Naveed Akbar,
  • Brian E Sansbury,
  • Sean P Heffron,
  • Jianhua Liu,
  • Gregory Marecki,
  • Dawn Fernandez,
  • Emily J Brown,
  • Kelly V Ruggles,
  • Stephen A Ramsey,
  • Chiara Giannarelli,
  • Matthew Spite,
  • Robin P Choudhury,
  • P'ng Loke,
  • Edward A Fisher

DOI
https://doi.org/10.7554/eLife.67932
Journal volume & issue
Vol. 10

Abstract

Read online

Atherosclerosis is a disease of chronic inflammation. We investigated the roles of the cytokines IL-4 and IL-13, the classical activators of STAT6, in the resolution of atherosclerosis inflammation. Using Il4-/-Il13-/- mice, resolution was impaired, and in control mice, in both progressing and resolving plaques, levels of IL-4 were stably low and IL-13 was undetectable. This suggested that IL-4 is required for atherosclerosis resolution, but collaborates with other factors. We had observed increased Wnt signaling in macrophages in resolving plaques, and human genetic data from others showed that a loss-of-function Wnt mutation was associated with premature atherosclerosis. We now find an inverse association between activation of Wnt signaling and disease severity in mice and humans. Wnt enhanced the expression of inflammation resolving factors after treatment with plaque-relevant low concentrations of IL-4. Mechanistically, activation of the Wnt pathway following lipid lowering potentiates IL-4 responsiveness in macrophages via a PGE2/STAT3 axis.

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