GATA2 Mediates Macrophage Proliferation During Atherosclerosis

Area of Science:

• Cardiovascular Biology
• Immunology
• Molecular Biology

Background:

• Atherosclerosis involves lipid-laden macrophages in vascular intima.
• Monocyte recruitment, proliferation, and differentiation drive lesion development.
• Signals controlling atheroma macrophage proliferation are poorly understood.

Purpose of the Study:

• Identify transcriptional regulators of atheroma macrophage proliferation.
• Investigate the role of GATA2 in macrophage behavior within atherosclerotic plaques.

Main Methods:

• Transcriptomic and histological analysis of human atherosclerotic plaques.
• In vitro models of macrophage function were utilized.
• Assessed GATA2 expression in relation to macrophage proliferation and disease severity.

Main Results:

• A subpopulation of macrophages expressing GATA2 was identified in plaques.
• GATA2 expression correlated with macrophage proliferation in all disease stages.
• GATA2 upregulation by oxidized LDL is necessary and sufficient for macrophage proliferation, mediated by MYB.
• GATA2 decreases sensitivity to unfolded protein response-induced apoptosis.

Conclusions:

• GATA2 is a key transcription factor mediating macrophage proliferation in atherosclerosis.
• GATA2 is upregulated by atherogenic stimuli, promoting plaque growth.
• Targeting GATA2 may offer a therapeutic strategy for atherosclerosis.