Exercise-Regulated Mitochondrial and Nuclear Signalling Networks in Skeletal Muscle.

Area of Science:

• Exercise Physiology
• Molecular Biology
• Biochemistry

Background:

• Exercise disrupts skeletal muscle energy balance, activating cellular signaling networks.
• Previous research focused on limited protein kinases (AMPK, PKA, CaMK, MAPK) and their substrates in exercise signaling.
• Global phosphoproteomic approaches reveal a more extensive network of exercise-regulated signaling pathways and protein modifications.

Purpose of the Study:

• To review recent advances in understanding molecular events in skeletal muscle signaling during acute endurance exercise.
• To focus on phosphorylation as a key post-translational modification in exercise-induced signaling.
• To highlight the role of mitochondrial and nuclear protein phosphorylation in adaptive responses.

Main Methods:

• Review of recent scientific literature.
• Focus on phosphoproteomic studies.
• Analysis of exercise-regulated signaling pathways and protein kinases.

Main Results:

• Acute exercise activates a complex network of signaling pathways and kinases in skeletal muscle.
• Phosphorylation of mitochondrial and nuclear proteins is a key event in exercise adaptation.
• Beyond traditional kinases, a wider array of signaling molecules are involved in exercise response.

Conclusions:

• Acute endurance exercise stimulates skeletal muscle mitochondrial biogenesis through intricate signaling pathways.
• Phosphorylation and translocation of mitochondrial and nuclear proteins are crucial for exercise-induced adaptations.
• Understanding these complex molecular events contributes to knowledge of exercise's health and fitness benefits.