Protein arginine methyltransferases coordinate mitochondrial stress adaptation and neuromuscular function

Area of Science:

• Aging research
• Mitochondrial biology
• Neuroscience

Background:

• Sarcopenia and neuromuscular degeneration are major causes of functional decline in aging.
• Mitochondrial dysfunction, including impaired oxidative phosphorylation and redox imbalance, contributes to muscle weakness and motor neuron degeneration.
• The upstream mechanisms driving the shift from adaptive responses to degenerative processes are not fully understood.

Purpose of the Study:

• To investigate the role of Protein Arginine Methyltransferases (PRMTs) in regulating mitochondrial and metabolic stress signaling.
• To explore how PRMTs influence pathways like AMPK-FOXO and mTOR in the context of neuromuscular aging.
• To elucidate the function of distinct PRMT family members in maintaining neuromuscular resilience.

Main Methods:

• Analysis of PRMTs' role in modulating mitochondrial function and stress adaptation.
• Investigation of PRMT interactions with key metabolic signaling pathways (AMPK-FOXO, mTOR).
• Examination of PRMT functions across different neuromuscular components (muscle fibers, satellite cells, motor neurons).

Main Results:

• PRMTs are identified as critical modulators of mitochondrial and metabolic stress signaling.
• PRMTs influence mitochondrial biogenesis, autophagy, proteostasis, and anabolic restraint.
• Distinct PRMTs have non-redundant roles in shaping neuromuscular stress resilience.

Conclusions:

• PRMTs act as molecular rheostats, directing cellular responses to mitochondrial stress.
• PRMT-regulated metabolic signaling is proposed as a unifying mechanism for sarcopenia and compromised healthspan.
• Targeting PRMTs may offer therapeutic strategies for age-related neuromuscular decline.