Integration of flow-dependent endothelial phenotypes by Kruppel-like factor 2

Area of Science:

• Vascular Biology
• Molecular Biology
• Cardiovascular Research

Background:

• Atherosclerosis develops despite systemic risk factors, with certain arterial regions showing resistance.
• Endothelial cells in these atheroprotected regions are influenced by biomechanical cues, but regulatory mechanisms are unclear.

Purpose of the Study:

• To elucidate the mechanisms by which endothelial cells in atheroprotected arterial regions resist atherosclerosis.
• To identify key transcription factors and signaling pathways involved in flow-mediated endothelial protection.

Main Methods:

• Investigated Kruppel-like factor 2 (KLF2) induction in endothelial cells under flow conditions mimicking atheroprotected sites.
• Utilized MEK5/ERK5/MEF2 signaling pathway analysis.
• Performed KLF2 overexpression and silencing experiments.
• Conducted genome-wide gene expression analyses.

Main Results:

• KLF2 is selectively induced by biomechanical stimuli in endothelial cells from atheroprotected human carotid regions via the MEK5/ERK5/MEF2 pathway.
• KLF2 induction orchestrates transcriptional programs regulating inflammation, thrombosis, vascular tone, and development.
• KLF2 globally modulates Interleukin-1 beta (IL-1beta)-mediated endothelial activation.

Conclusions:

• KLF2 acts as a critical mechano-activated transcription factor in endothelial cells.
• KLF2 integrates multiple endothelial functions that confer resistance to atherogenesis in specific arterial regions.