Cpeb1 remodels cell type-specific translational program to promote fear extinction

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Protein translation is essential for fear extinction, a key adaptive behavior.
• Cell-specific mechanisms regulating protein translation during fear extinction are not fully understood.

Purpose of the Study:

• To investigate the role of cell-specific protein translation in fear extinction.
• To explore the function of cytoplasmic polyadenylation element binding protein 1 (Cpeb1) in regulating translational programs during fear extinction.

Main Methods:

• Utilized a Tet-On 3G genetic system for temporal control of protein translation in the infralimbic medial prefrontal cortex (IL).
• Analyzed the effects of Cpeb1 disruption on cell type-specific translational programs in neurons and microglia.

Main Results:

• Cpeb1 deficiency altered neuronal and microglial translational programs, impacting fear extinction.
• In neurons, Cpeb1 loss increased heterochromatin protein 1 binding protein 3 translation, enhancing microRNA networks.
• In microglia, Cpeb1 loss suppressed chemokine receptor 1 (Cx3cr1) translation, inducing an aged-like phenotype and impairing spine formation and plasticity.

Conclusions:

• Cell type-specific protein translation, regulated by Cpeb1, is critical for fear extinction.
• Targeting Cpeb1-mediated translational control offers potential therapeutic strategies for disorders involving extinction deficits.