MicroRNA-210 Enhances Fibrous Cap Stability in Advanced Atherosclerotic Lesions

Area of Science:

• Cardiovascular Biology
• Molecular Medicine
• Genomics

Background:

• MicroRNAs (miRNAs) are key regulators in vascular disease.
• Identifying specific miRNAs can reveal therapeutic targets for cardiovascular conditions.

Purpose of the Study:

• Investigate microRNAs in patients with unstable carotid stenosis.
• Determine the role of specific miRNAs in stroke risk associated with carotid plaques.

Main Methods:

• miRNA expression profiling using PCR-based arrays on plasma from carotid lesion sites.
• Laser capture microdissection and in situ hybridization for miRNA localization.
• In vitro and in vivo studies in rodent models to assess miR-210 function.

Main Results:

• Eight miRNAs were deregulated in unstable carotid plaques, with miR-210 being significantly downregulated.
• miR-210 was localized to fibrous caps and directly targets the APC gene, influencing Wnt signaling and smooth muscle cell survival.
• Modulating miR-210 improved fibrous cap stability in preclinical models.

Conclusions:

• Low miR-210 expression is a marker of unstable carotid plaques and stroke risk.
• miR-210 promotes plaque stability by inhibiting APC and supporting smooth muscle cell survival.
• Local delivery of miR-210 presents a novel therapeutic strategy for preventing atherothrombotic events.