Profilin-1 promotes the development of hypertension-induced cardiac hypertrophy

Area of Science:

• Cardiovascular Biology
• Molecular Cardiology
• Hypertension Research

Background:

• Cardiac hypertrophy is a significant risk factor for heart failure and sudden cardiac death in hypertensive patients.
• Understanding the molecular mechanisms underlying cardiac hypertrophy is crucial for developing effective therapeutic strategies.

Purpose of the Study:

• To investigate the role of profilin-1 in the development of cardiac hypertrophy induced by hypertension.
• To elucidate the molecular pathways through which profilin-1 influences cardiac structure and function in hypertensive conditions.

Main Methods:

• Adenovirus-mediated knockdown or overexpression of profilin-1 in spontaneous hypertensive rats (SHRs).
• Assessment of systolic blood pressure, cardiac mass index, and cardiac histology (hematoxylin-eosin, sirius red).
• Evaluation of cardiac ultrastructure, actin filament organization, caveolin-3 expression, and endothelial nitric oxide synthase (eNOS) activity.

Main Results:

• Profilin-1 expression was elevated in the hypertrophic myocardium of SHRs compared to normotensive controls.
• Reducing profilin-1 attenuated cardiac hypertrophy, fibrosis, and preserved myofibrils, sarcolemmal caveolae, caveolin-3, and eNOS activity.
• Overexpression of profilin-1 exacerbated cardiac hypertrophy, fibrosis, and reduced sarcolemmal caveolae, caveolin-3, and eNOS activity and nitric oxide production.

Conclusions:

• Profilin-1 plays a critical role in promoting hypertension-induced cardiac hypertrophy.
• Profilin-1 interferes with sarcolemmal caveolae formation and attenuates the eNOS/NO pathway, contributing to cardiac remodeling.
• Targeting profilin-1 may represent a novel therapeutic approach for managing hypertensive cardiac hypertrophy.