Translation regulation in sleep: Making experience last.

Area of Science:

• Neuroscience
• Molecular Biology
• Sleep Science

Background:

• Sleep is crucial for cognitive functions and brain plasticity.
• Experience-dependent synaptic plasticity involves gene and protein expression.
• mRNA translation at synapses is vital for persistent plasticity and memory.

Purpose of the Study:

• To investigate the molecular mechanisms of sleep-dependent cortical plasticity consolidation.
• To determine the role of protein synthesis and the mTOR pathway in ocular dominance plasticity (ODP).

Main Methods:

• Utilized a developing cat model for in vivo ocular dominance plasticity (ODP).
• Investigated the involvement of protein synthesis during sleep in plasticity consolidation.
• Examined the activation of the mammalian target of rapamycin (mTOR) pathway.
• Assessed the translation of synaptic plasticity proteins like ARC and BDNF.

Main Results:

• Sleep is required for the consolidation of ODP in vivo.
• Protein synthesis during sleep is essential for this consolidation process.
• Activation of the mTOR pathway is necessary for sleep-dependent ODP consolidation.
• Sleep specifically promotes the translation, not transcription, of ARC and BDNF proteins.

Conclusions:

• Sleep facilitates cortical plasticity consolidation through a novel molecular mechanism.
• The mTOR pathway and targeted mRNA translation during sleep are critical for strengthening synaptic plasticity.
• This study uncovers a new role for sleep in regulating protein synthesis for in vivo brain plasticity.