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Area of Science:

  • Cardiovascular Biology
  • Immunology
  • Cellular Biology

Background:

  • Inflammation is a key factor in cardiovascular disease development and progression.
  • Macrophages, particularly cardiac resident macrophages (CRMs), are crucial in cardiac remodeling.
  • The exact mechanisms by which CRMs influence heart failure remodeling are not fully understood.

Purpose of the Study:

  • To investigate the role of cardiac resident macrophages (CRMs) in heart failure.
  • To identify the specific molecules and pathways by which CRMs regulate cardiac remodeling.
  • To explore the therapeutic potential of targeting CRM-derived factors in heart failure.

Main Methods:

  • Utilized in vivo and ex vivo models, including pressure overload (transverse aortic constriction) in mice.
  • Generated CCL24-deficient and fibroblast-specific CCR3-deficient mice using CRISPR/Cas9 technology.
  • Investigated the direct effects of CCL24 on cardiac fibroblasts and downstream signaling pathways (PI3K, TGF-β).

Main Results:

  • Identified a subpopulation of CRMs expressing high levels of CCL24 during pressure overload.
  • CCL24 deficiency ameliorated cardiac fibrosis and improved cardiac function post-injury.
  • CCL24 directly activated cardiac fibroblasts via CCR3, promoting proliferation and fibrosis through PI3K and TGF-β.
  • Fibroblast-specific CCR3 deletion or pharmacological blockade of the CCL24-CCR3 axis improved cardiac function in pressure-overloaded mice.

Conclusions:

  • Macrophage-derived CCL24 exacerbates cardiac fibrosis and impairs cardiac function in heart failure through the CCR3 receptor.
  • The CCL24-CCR3 signaling axis represents a promising therapeutic target for mitigating adverse cardiac remodeling in heart failure.