Disturbed flow-enhanced endothelial turnover in atherosclerosis

Area of Science:

• Cardiovascular Biology
• Endothelial Cell Biology
• Atherosclerosis Research

Background:

• Endothelial dysfunction and death are early events in atherosclerosis, particularly in areas with disturbed blood flow.
• Rapid endothelial cell turnover and repair mechanisms are observed in atherosclerosis-prone regions.
• Altered blood flow influences endothelial cell fate through various signaling pathways.

Purpose of the Study:

• To review recent advancements in understanding endothelial cell turnover in response to disturbed blood flow.
• To discuss the molecular mechanisms underlying endothelial cell death and proliferation in atherosclerosis development.

Main Methods:

• Literature review of studies on endothelial cell turnover and signaling pathways.
• Analysis of mechanisms involving endoplasmic reticulum stress, apoptosis, and cell survival pathways.
• Focus on key signaling molecules like X-box binding protein 1, Akt, and histone deacetylase 3.

Main Results:

• Disturbed blood flow triggers distinct signaling pathways for endothelial apoptosis (e.g., ER stress-XBP1-caspase) and survival (e.g., VEGFR-HDAC3-Akt).
• Endothelial cells in atherosclerosis-prone areas exhibit a dynamic turnover involving both death and repair processes.
• Specific molecular pathways mediate the balance between endothelial cell death and proliferation under flow alterations.

Conclusions:

• Endothelial cell turnover is a critical determinant in the development of atherosclerosis.
• Understanding the signaling pathways involved in endothelial response to disturbed flow is essential for therapeutic strategies.
• Targeting these pathways may offer novel approaches to prevent or treat atherosclerosis.