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Area of Science:

  • Cardiovascular immunology
  • Cancer therapy side effects
  • Macrophage biology

Background:

  • Heart failure and ischemic heart disease are major causes of death in cancer survivors.
  • Conventional chemotherapies' impact on the cardiac immune system is poorly understood.
  • DNA-damaging agents are widely used in cancer treatment.

Purpose of the Study:

  • To investigate the effects of DNA-damaging chemotherapies on cardiac-resident macrophages.
  • To understand the mechanisms of cardiac immune system reconstitution after chemotherapy.
  • To explore the protective functions of newly recruited cardiac macrophages.

Main Methods:

  • Mouse models of chemotherapy exposure.
  • Genetic lineage tracing to track cell origins.
  • Transcriptomic profiling to analyze gene expression.
  • Functional assays to assess cardiac injury and protection.

Main Results:

  • DNA-damaging agents induce p53-dependent depletion of cardiac-resident macrophages via necroptosis and apoptosis.
  • Recruited monocytes repopulate the cardiac macrophage compartment.
  • Monocyte-derived macrophages are transcriptionally distinct from embryonic-derived macrophages.
  • These monocyte-derived macrophages protect against hypertensive and ischemic cardiac injury.
  • They suppress inflammation and adverse remodeling through type I interferon signaling.

Conclusions:

  • DNA-damaging chemotherapies profoundly alter the cardiac immune landscape by depleting resident macrophages.
  • Monocyte plasticity allows for the reconstitution of a protective cardiac macrophage pool.
  • These findings enhance understanding of chemotherapy cardiotoxicity and macrophage dynamics.