from Section III - Neuronal regulation
Published online by Cambridge University Press: 07 September 2011
Summary
The data outlined in this chapter provides evidence to support a concept that the activation of pontine-wave (P-wave) generating neurons plays a critical role in long-term memory formation. The P-wave, generated by the phasic activation of glutamatergic neurons in the pons, is one of the most prominent phasic events of REM sleep. These P-wave generating neurons project to the hippocampus, amygdala, entorhinal cortex and many other regions of the brain known to be involved in cognitive processing. These P-wave generating glutamatergic neurons remain silent during wakefulness and slow-wave sleep (SWS), but during the transition from SWS to REM sleep and throughout REM sleep these neurons discharge high-frequency spike bursts in the background of tonically increased firing rates. Activation of these P-wave generating neurons increases glutamate release and activates postsynaptic N-methyl-D-aspartic acid (NMDA) receptors in the dorsal hippocampus. Activation of P-wave generating neurons increases phosphorylation of transcription factor cAMP response element binding protein (CREB) in the dorsal hippocampus and amygdala by activating intracellular protein kinase A (PKA). The P-wave generating neurons activation-dependent PKA-CREB phosphorylation increases the expression of activity-regulated cytoskeletal-associated protein (Arc), brain-derived neurotrophic factor (BDNF), and early growth response-1 (Egr-1) genes in the dorsal hippocampus and amygdala. The P-wave generator activation-induced increased activation of PKA and expression of pCREB, Arc, BDNF, and Egr-1 in the dorsal hippocampus is shown to be necessary for REM sleep-dependent memory processing. Continued research on P-wave generation and its functions may provide new advances in understanding memory and treating its disorders.
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