FLRT2 prevents endothelial cell senescence and vascular aging by regulating the ITGB4/mTORC2/p53 signaling pathway

Area of Science:

• Vascular biology
• Cellular senescence
• Aging research

Background:

• The function of fibronectin leucine-rich transmembrane protein 2 (FLRT2) in health and disease remains largely undefined.
• Endothelial cell senescence and vascular aging are critical factors in age-related cardiovascular diseases.

Purpose of the Study:

• To investigate the role of FLRT2 in endothelial cell senescence and vascular aging.
• To elucidate the molecular mechanisms by which FLRT2 influences these processes.

Main Methods:

• Quantitative analysis of FLRT2 expression in senescent endothelial cells and aged vascular tissues.
• Investigation of FLRT2's role in senescence pathways, including mTORC2, AKT, and p53.
• Assessment of FLRT2's interaction with integrin subunit beta 4 (ITGB4).
• In vivo studies using FLRT2 silencing and overexpression in mouse models of vascular aging.

Main Results:

• FLRT2 expression is decreased in senescent endothelial cells and aged vascular tissues.
• FLRT2 regulates endothelial cell senescence through the mTORC2, AKT, and p53 signaling pathway.
• FLRT2 directly interacts with ITGB4, promoting its phosphorylation, which is crucial for senescence induction upon FLRT2 depletion.
• FLRT2 deficiency accelerates vascular aging in mice, while its overexpression ameliorates premature aging phenotypes.

Conclusions:

• FLRT2 plays a protective role against endothelial cell senescence and vascular aging.
• Targeting FLRT2 may offer a novel therapeutic strategy for preventing senescence-associated vascular aging and related cardiovascular conditions.