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RPLP2 Mediates the Beneficial Effects of Exercise on Stress Resistance Through Muscle-Brain Communication
Summary
Exercise reduces anxiety by releasing acidic ribosomal protein P2 (RPLP2) from muscles. This protein enhances brain cell growth and function, revealing a new muscle-brain pathway for stress resistance.
Area of Science:
- Neuroscience
- Molecular Biology
- Exercise Physiology
Background:
- Anxiety disorders represent a significant public health challenge.
- Exercise is recognized for its benefits in managing anxiety, but its molecular underpinnings are not fully understood.
- Previous research indicated exercise reduces anxiety and increases circulating acidic ribosomal protein P2 (RPLP2).
Purpose of the Study:
- To elucidate the molecular mechanisms by which exercise alleviates anxiety.
- To investigate the role of acidic ribosomal protein P2 (RPLP2) in exercise-induced anxiolysis.
- To explore the connection between muscle-derived RPLP2 and hippocampal neurogenesis.
Main Methods:
- An 8-week randomized controlled trial in humans to assess exercise effects on anxiety and RPLP2 levels.
- Experiments in mice to confirm the anxiolytic effects of skeletal muscle-derived RPLP2.
- Molecular analyses to determine RPLP2's mechanism in promoting neurogenesis and synaptic plasticity.
Main Results:
- Exercise significantly reduced anxiety levels and increased circulating RPLP2.
- Elevated RPLP2 levels were inversely correlated with anxiety severity.
- Skeletal muscle-derived RPLP2 administration in mice facilitated hippocampal neurogenesis and synaptic maturation, leading to anxiolytic effects.
Conclusions:
- A novel muscle-brain axis mediated by RPLP2 has been identified.
- RPLP2 enhances local protein synthesis, supporting the development and integration of new neurons in the hippocampus.
- These findings provide mechanistic insights into exercise-induced stress resistance and highlight RPLP2 as a potential therapeutic target.
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