Focal Adhesion's Role in Cardiomyocytes Function: From Cardiomyogenesis to Mechanotransduction

Area of Science:

• Cellular Mechanobiology
• Cardiovascular Research
• Molecular Cell Biology

Background:

• Mechanotransduction is the cellular process of converting mechanical stimuli into biochemical signals.
• Focal adhesions (FAs) are multiprotein complexes essential for linking intracellular actin to the extracellular matrix (ECM).
• FAs regulate critical cellular functions including adhesion, migration, differentiation, and force transmission.

Purpose of the Study:

• To review the molecular and mechanical mechanisms of focal adhesion (FA) mediated mechanotransduction in cardiac differentiation.
• To elucidate the role of FA signaling in cardiomyogenesis and cardiac muscle response to mechanical stimuli.
• To highlight key signaling molecules and pathways involved in FA mechanotransduction within the heart.

Main Methods:

• Literature review focusing on mechanotransduction, focal adhesions, and cardiac development.
• Analysis of signaling pathways including integrins, Focal Adhesion Kinase (FAK), PI3K/AKT, and Wnt/β-catenin.
• Examination of the role of FA components in cellular processes like proliferation and heart tube looping.

Main Results:

• Focal adhesion signaling molecules (FAK, integrins, vinculin, paxillin) are pivotal in cardiomyogenesis.
• Cardiomyocytes sense ECM stiffness via integrins, modulating PI3K/AKT and Wnt/β-catenin pathways.
• FAK/Src complex activation mediates cardiac hypertrophic growth and survival in response to mechanical loads.

Conclusions:

• Focal adhesions are central to the mechanotransduction processes governing cardiac differentiation and development.
• Understanding FA-mediated signaling is critical for comprehending cardiac muscle adaptation to mechanical cues.
• This review consolidates knowledge on the interplay between focal adhesions and cardiac responses to mechanical forces.