Angiogenesis in fatal acute Kawasaki disease coronary artery and myocardium

Area of Science:

• Cardiovascular Research
• Pediatric Pathology
• Vascular Biology

Background:

• Kawasaki disease (KD) is an acute febrile illness causing inflammation in young children.
• Coronary artery aneurysms (CA) are a serious complication of KD, particularly in the chronic phase.
• Inflammation is known to influence angiogenesis, the formation of new blood vessels.

Purpose of the Study:

• To investigate the role of angiogenesis mediators in the acute phase of KD.
• To determine if inflammation in acute KD CA aneurysms leads to dysregulated angiogenesis and neovascularization.
• To assess the timing and extent of neovascularization in acute KD.

Main Methods:

• Immunohistochemical staining of acute fatal KD cardiac tissues for angiogenic inducers and inhibitors.
• Quantification of microvessel density.
• Assessment of the degree of inflammation in affected tissues.

Main Results:

• Significant inflammation and angiogenesis were observed in acute KD CA aneurysms and myocardium.
• Peak microvessel density occurred 2-3 weeks after disease onset.
• Proangiogenic protein expression exceeded inhibitor expression in KD tissues, with mediators localized to inflammatory cells.

Conclusions:

• Neovascularization occurs early in acute KD CA aneurysms and myocardium, earlier than previously reported.
• Multiple angiogenesis factors are involved in the pathogenesis of KD vasculopathy.
• Dysregulation of angiogenesis is a key contributor to the vascular damage seen in Kawasaki disease.