Molecular and Cellular Mechanisms of Atrial Fibrosis in Atrial Fibrillation

JACC. Clinical Electrophysiology
Stanley Nattel

Abstract

Atrial fibrillation (AF) is the most common arrhythmia in clinical practice. Atrial fibrosis has emerged as an important pathophysiological contributor and has been linked to AF recurrences, resistance to therapy and complications. Here, the author reviews the molecular and cellular mechanisms that control atrial fibrosis. It is important to note that not all tissue fibrosis is identical. For example, reactive (interstitial) fibrosis increases the amount of collagen between cardiac muscle bundles without fundamentally altering muscle bundle architecture. Replacement (reparative) fibrosis replaces dead cardiomyocytes with extracellular matrix tissue and fibroblasts, preserving tissue integrity at the expense of muscle bundle continuity. Replacement fibrosis may be much more disruptive to electric conduction and more difficult to reverse than reactive fibrosis. The author reviews the complex signaling systems that cause fibrosis, including those connected to connective tissue growth factor, angiotensin-II, platelet-derived growth factor, and transforming growth factor-β. The author then considers the molecular constitution of fibrous tissue, including the production and maturation of collagen and the roles of important extracellu...Continue Reading

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Citations

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