Enhancer-Associated LncRNA-ITGA2 Promotes Vascular Remodeling Through ITGA2

Area of Science:

• Vascular Biology
• Epigenetics
• Molecular Mechanisms of Disease

Background:

• Vascular smooth muscle cell (VSMC) proliferation and migration are critical in vascular remodeling.
• Enhancer-associated long noncoding RNAs (elncRNAs) are implicated in cell fate, but their role in VSMC dysfunction is unclear.

Purpose of the Study:

• To identify and characterize novel elncRNAs involved in VSMC dysfunction.
• To elucidate the regulatory mechanisms of elncRNAs in vascular remodeling.

Main Methods:

• Multiomics profiling (CUT&Tag, Hi-C, microarray) to identify LncRNA-ITGA2.
• In vivo carotid artery wire injury model and in vitro VSMC culture.
• RNA sequencing, CRISPR-Cas9, ChIP-seq, ChIRP, and RIP to investigate mechanisms.

Main Results:

• LncRNA-ITGA2 is upregulated in proliferative VSMCs and atherosclerotic tissues.
• Overexpression of LncRNA-ITGA2 promotes VSMC proliferation, migration, and neointimal hyperplasia.
• LncRNA-ITGA2 enhances ITGA2 expression by facilitating enhancer-promoter interaction and H3K27 acetylation, dependent on NONO.

Conclusions:

• LncRNA-ITGA2 promotes VSMC proliferation and migration via a NONO-dependent mechanism, linking enhancer-ITGA2 and promoter-ITGA2.
• This elncRNA is a potential diagnostic and therapeutic target for proliferative vascular diseases.