Role of defective Ca²⁺ signaling in skeletal muscle weakness: Pharmacological implications

Area of Science:

• Muscle physiology and pathophysiology
• Calcium signaling in cellular function
• Molecular mechanisms of muscular disorders

Background:

• Aberrant calcium (Ca²⁺) signaling is implicated in numerous muscle disorders, including myopathies, cachexia, sarcopenia, heart failure, and muscular dystrophy.
• Disruptions in Ca²⁺ homeostasis are a common underlying factor in these conditions, affecting muscle function and integrity.

Purpose of the Study:

• To review the role of Ca²⁺ signaling pathways in the pathogenesis of muscle disorders.
• To elucidate the function and remodeling of key calcium regulatory channels and pumps.
• To explore potential therapeutic strategies targeting calcium ion channels for muscle atrophy.

Main Methods:

• Literature review focusing on calcium flux regulating signaling channels.
• Detailed examination of ryanodine receptor complex (RyR1), SERCA, DHPR (Cav1.1), and Na+/Ca²⁺ exchange pump.
• Analysis of how channel remodeling impacts calcium homeostasis.

Main Results:

• Remodeling of calcium channels, including RyR1, SERCA, DHPR (Cav1.1), and Na+/Ca²⁺ exchange pump, significantly contributes to disturbed calcium homeostasis.
• These alterations in calcium flux are central to the development and progression of various muscle disorders.

Conclusions:

• Understanding the intricate calcium signaling pathways and channel remodeling is crucial for developing novel therapeutic interventions.
• Targeting calcium ion channels and associated proteins offers a promising avenue for preventing and treating muscle atrophy, particularly under stress conditions.