lncRNA H19 facilitates vascular neointima formation by targeting miR-125a-3p/FLT1 axis

Area of Science:

• Cardiovascular Biology
• Molecular Biology
• RNA Therapeutics

Background:

• Aberrant vascular smooth muscle cell (VSMC) proliferation and migration are key drivers of neointima formation in vascular restenosis.
• Understanding the regulatory mechanisms of VSMC behavior is crucial for developing effective restenosis therapies.

Purpose of the Study:

• To investigate the role of the long noncoding RNA H19 (lncRNA H19) in neointima formation.
• To elucidate the molecular mechanism by which lncRNA H19 influences VSMC behavior and vascular restenosis.

Main Methods:

• Establishment of a mouse carotid ligation model for in vivo studies.
• Utilizing human VSMCs as an in vitro cell model.
• Employing molecular biology techniques to assess gene and microRNA expression, cell proliferation, migration, and target interactions.

Main Results:

• Overexpression of lncRNA H19 significantly promoted VSMC proliferation and migration.
• lncRNA H19 was found to potentially bind to miR-125a-3p, with Fms-like tyrosine kinase-1 (FLT1) identified as a potential target of miR-125a-3p.
• Upregulation of miR-125a-3p counteracted the pro-proliferative and pro-migratory effects of lncRNA H19 on VSMCs.
• Rescue experiments demonstrated that miR-125a-3p attenuated lncRNA H19-induced FLT1 expression.
• lncRNA H19 overexpression exacerbated neointima formation in the mouse model.

Conclusions:

• lncRNA H19 acts as a competing endogenous RNA (ceRNA) by sponging miR-125a-3p, thereby stimulating VSMC proliferation and migration.
• This mechanism highlights lncRNA H19's significant contribution to neointima formation in vascular restenosis.
• lncRNA H19 emerges as a potential therapeutic target for the treatment of vascular restenosis.