Fibroblasts in the Infarcted, Remodeling, and Failing Heart

Area of Science:

• Cardiovascular Biology
• Cellular Biology
• Cardiac Pathophysiology

Background:

• Fibroblast activation post-cardiac injury is crucial for repair but linked to adverse cardiac remodeling and fibrosis.
• Traditional views consider fibroblasts primarily as contributors to fibrosis and diastolic dysfunction.
• Recent evidence suggests a more complex, multifaceted role for cardiac fibroblasts.

Purpose of the Study:

• To discuss the dynamic alterations and diverse functions of cardiac fibroblasts in failing and remodeling myocardium.
• To explore emerging concepts regarding fibroblast heterogeneity and their impact on cardiac health.
• To highlight the protective roles of activated fibroblasts in addition to their fibrotic contributions.

Main Methods:

• Review and synthesis of current literature on cardiac fibroblast biology.
• Analysis of dynamic changes in fibroblasts within failing and remodeling cardiac tissue.
• Integration of emerging concepts on fibroblast phenotypic heterogeneity.

Main Results:

• Cardiac fibroblasts exhibit dynamic alterations in response to injury, influencing repair and remodeling.
• Activated fibroblasts possess diverse functions, including extracellular matrix preservation, cardiomyocyte survival signaling, and regulation of inflammation and angiogenesis.
• Fibroblast heterogeneity is proposed as the basis for their varied functional activities.

Conclusions:

• Cardiac fibroblasts are not solely fibrotic contributors but play complex, heterogeneous roles in cardiac repair and pathology.
• Understanding fibroblast functional diversity is critical for developing targeted therapies for cardiac injury and dysfunction.
• Phenotypic heterogeneity underlies the protective and detrimental actions of cardiac fibroblasts in the myocardium.