CREB selectively controls learning-induced structural remodeling of neurons

Area of Science:

• Neuroscience
• Molecular Biology
• Cognitive Science

Background:

• Synaptic plasticity, regulated by dendritic spine changes, underlies learning and memory.
• The transcription factor CREB (cAMP response element binding protein) is implicated in memory but its role in learning-induced neuronal structural remodeling is unclear.

Purpose of the Study:

• To investigate the role of CREB in learning-induced structural adaptations of neurons, specifically dendritic spine remodeling.

Main Methods:

• Utilized transgenic mice expressing a dominant-negative CREB mutant (CREBS133A: mCREB).
• Assessed effects of CREB inhibition on spine density, morphology, and actin polymerization in CA1 neurons.
• Evaluated contextual fear conditioning performance and rescue by blocking mCREB expression with doxycycline.

Main Results:

• CREB inhibition did not affect naive neuron spine density, morphology, or actin levels.
• Impaired contextual fear conditioning and induced spine collapse were observed upon CREB inhibition during learning.
• Doxycycline-mediated blockade of mCREB expression rescued memory and normalized learning-induced spine patterns.

Conclusions:

• CREB signaling is essential for the structural plasticity of neurons during memory formation.
• CREB controls activity-dependent changes in dendritic spines and actin polymerization linked to learning.
• Targeting CREB function offers a potential avenue for understanding and modulating memory processes.