Telomere Shortening Drives Atrial Fibrillation Through VCAM-1 Mediated Atrial Electrical and Structural Remodeling

Area of Science:

• Cardiology
• Aging Research
• Molecular Biology

Background:

• Telomere shortening is a hallmark of aging and linked to cardiovascular disease.
• The specific mechanisms connecting telomere length to atrial fibrillation (AF) are not well understood.

Purpose of the Study:

• To investigate the mechanistic link between telomere shortening and atrial fibrillation.
• To identify potential therapeutic targets for age-related AF.

Main Methods:

• Developed a high-throughput assay to quantify leukocyte telomere length (LTL).
• Utilized age-stratified analyses in humans and telomerase-deficient mice models.
• Performed transcriptomic profiling and validated findings through functional inhibition of VCAM-1.

Main Results:

• Shorter LTL was associated with AF in individuals younger than 70 years.
• Telomere dysfunction in mice led to increased AF inducibility, slowed atrial conduction, and fibrosis.
• VCAM-1 inhibition reversed electrophysiological abnormalities, reduced fibrosis, and decreased AF susceptibility by 30%.

Conclusions:

• A telomere-VCAM-1 axis drives atrial remodeling and arrhythmogenesis in aging.
• VCAM-1 is a potential mediator linking telomere shortening to AF.
• VCAM-1 represents a promising therapeutic target for age-related atrial fibrillation.