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Related Experiment Video

Updated: Aug 31, 2025

Quantification of Monocyte Chemotactic Activity In Vivo and Characterization of Blood Monocyte Derived Macrophages
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Intimal macrophages develop from circulating monocytes during vasculitis.

Angus T Stock1, Sarah Parsons2,3, Varun J Sharma4,5,6

  • 1Walter and Eliza Hall Institute of Medical Research Parkville VIC Australia.

Clinical & Translational Immunology
|August 22, 2022
PubMed
Summary
This summary is machine-generated.

In Kawasaki disease (KD), intimal macrophages originate from circulating monocytes. These monocytes infiltrate the coronary artery intima via transluminal migration during inflammation.

Keywords:
Kawasaki diseaseintimal hyperplasiamacrophagesmonocytesvasculitis

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Area of Science:

  • Cardiovascular Pathology
  • Immunology
  • Pediatric Rheumatology

Background:

  • Vasculitis involves blood vessel inflammation, with intimal layer involvement posing significant clinical concern due to thrombosis risk.
  • Intimal inflammation in vasculitis is poorly understood, particularly the origin of macrophages in this immune-privileged site.

Purpose of the Study:

  • To investigate the origin and development of macrophages within the intimal layer during vasculitis, specifically Kawasaki disease (KD).
  • To elucidate the cellular mechanisms driving intimal macrophage accumulation in the coronary arteries during KD.

Main Methods:

  • Confocal microscopy and flow cytometry were used to analyze macrophages in coronary artery intima from KD patients and a mouse model.
  • Adoptive transfer experiments were employed to trace the developmental pathway of intimal macrophages.

Main Results:

  • Kawasaki disease (KD) patients exhibited significant macrophage infiltration and intimal hyperplasia in coronary arteries.
  • Intimal macrophages in KD lacked resident cardiac macrophage markers (e.g., Lyve-1) and expressed Ccr2, indicating a monocytic origin.
  • Circulating monocytes were observed to migrate directly into the intima via transluminal migration during active disease.

Conclusions:

  • Intimal macrophages in Kawasaki disease (KD) are derived from circulating monocytes.
  • These monocytes infiltrate the inflamed coronary artery intima through transluminal migration during active KD.