Nuclear factor κB-dependent histone acetylation is specifically involved in persistent forms of memory

Area of Science:

• Neuroscience
• Epigenetics
• Molecular Biology

Background:

• Memory consolidation involves gene expression and chromatin modifications like histone acetylation.
• Histone acetylation's role in memory persistence, particularly differentiating between memory strengths, remains unclear.

Purpose of the Study:

• To investigate whether histone acetylation is specifically associated with enduring memories.
• To explore the role of histone acetylases, deacetylases, and Nuclear Factor κB (NF-κB) in memory persistence.

Main Methods:

• Utilized varying training strengths in a novel object recognition task in mice.
• Administered inhibitors for histone acetylase and deacetylase in the hippocampus.
• Inhibited the Nuclear Factor κB (NF-κB) transcription factor.

Main Results:

• Strong training induced long-lasting memory and increased hippocampal histone H3 acetylation.
• Inhibiting histone acetylase impaired memory persistence; inhibiting histone deacetylase promoted weak memory persistence.
• NF-κB inhibition reduced H3 acetylation and impaired memory persistence, with specific effects on the Camk2d gene promoter.

Conclusions:

• Histone acetylation is a specific molecular signature of enduring memories.
• NF-κB-mediated histone acetylation at specific gene promoters is crucial for memory persistence.