Brain rhythm attractor breakdown in Alzheimer's disease: Functional and pathologic implications.

Area of Science:

• Neuroscience
• Sleep Medicine
• Alzheimer's Disease Research

Background:

• Emerging evidence suggests a bidirectional relationship between Alzheimer's disease (AD) and sleep disorders.
• A novel perspective models this connection through brain rhythm attractor breakdown.

Purpose of the Study:

• To explain behavioral-cognitive changes in AD across the sleep-wake cycle.
• To propose a causal link between early brainstem tau pathology and subsequent amyloid-beta (Aβ) accumulation.
• To explore the role of disrupted sleep-wake regulation in AD pathogenesis.

Main Methods:

• Conceptual modeling integrating evidence on tau pathology, sleep-wake cycles, and Aβ deposition.
• Analysis of brain rhythm attractor dynamics in the context of AD.
• Examination of the impact of disrupted sleep on synaptic plasticity and memory consolidation.

Main Results:

• Early tau dysregulation in brainstem-hypothalamic nuclei disrupts sleep-wake attractor networks, leading to a "twilight zone" of constant brain activity.
• This sustained cortical activity promotes activity-dependent Aβ accumulation, particularly in the medial prefrontal cortex.
• Breakdown of hippocampal-medial prefrontal cortex connectivity during sleep impairs memory consolidation via synaptic plasticity dysregulation.

Conclusions:

• The brain rhythm attractor breakdown model provides a framework for understanding AD-sleep disorder interplay.
• Therapeutic strategies targeting attractor consolidation, such as slow-wave sleep enhancers, may delay AD progression.
• This perspective highlights the critical role of sleep regulation in AD pathogenesis and offers potential therapeutic avenues.