Endogenous BDNF is required for long-term memory formation in the rat parietal cortex

Area of Science:

• Neuroscience
• Molecular Biology
• Cognitive Science

Background:

• Memory formation is a complex, time-dependent process involving various brain structures.
• Cortical plasticity is vital for long-term memory storage, but molecular mechanisms in the neocortex are not fully understood.
• Brain-derived neurotrophic factor (BDNF) influences synaptic plasticity in both hippocampal and cortical neurons.

Purpose of the Study:

• To investigate the role of BDNF in the parietal cortex (PCx) for short-term memory (STM) and long-term memory (LTM) formation.
• To explore the involvement of CREB activation in BDNF-mediated memory processes within the PCx.

Main Methods:

• Rats were trained on a one-trial fear-motivated inhibitory avoidance task.
• Function-blocking anti-BDNF antibodies or recombinant human BDNF were infused into the PCx.
• Western blotting was used to assess CREB phosphorylation levels.

Main Results:

• Infusion of anti-BDNF antibodies into the PCx significantly impaired both STM and LTM retention.
• Anti-BDNF treatment decreased the phosphorylation state of CREB in the PCx.
• Administration of recombinant BDNF facilitated LTM and increased CREB activation.
• Inhibitory avoidance training rapidly increased the phospho-CREB/total CREB ratio in the PCx.

Conclusions:

• Endogenous BDNF in the parietal cortex is essential for the formation of both STM and LTM in inhibitory avoidance learning.
• BDNF's role in memory consolidation likely involves the activation of CREB-dependent pathways.
• Neocortical regions, including early sensory areas, are critical components of memory formation networks.