Transcranial near infrared therapy reprograms metabolism to rescue sleep and place cell functionality

Area of Science:

• Neuroscience
• Biomedical Engineering
• Gerontology

Background:

• Sleep disturbances accelerate Alzheimer's disease (AD) pathology, leading to cognitive decline and memory impairment.
• Chronic sleep deprivation (SD) significantly impacts hippocampal function, a key area for memory.

Purpose of the Study:

• To investigate the therapeutic potential of transcranial near-infrared (tNIR) therapy on hippocampal dysfunction induced by chronic sleep deprivation in a mouse model of AD.
• To assess the effects of tNIR on neural activity, metabolic function, and sleep architecture in the context of AD-related sleep disturbances.

Main Methods:

• Utilized a tauopathy mouse model of Alzheimer's disease subjected to chronic sleep deprivation.
• Administered targeted 808 nm transcranial near-infrared (tNIR) therapy.
• Assessed cerebral blood flow, metabolic activity, ionic homeostasis, hippocampal oscillatory dynamics, and sleep architecture.

Main Results:

• tNIR therapy restored cerebral blood flow, enhanced oxidative phosphorylation, and reestablished ionic homeostasis.
• Significant improvements were observed in hippocampal theta, gamma, and delta power, synchronized sharp-wave ripples (SWRs), and place cell activity.
• tNIR therapy refined spatial encoding precision and reorganized sleep architecture, increasing slow-wave sleep and reducing REM sleep disturbances.

Conclusions:

• Transcranial near-infrared therapy is a promising non-invasive intervention for mitigating sleep deprivation-induced cognitive and neural impairments in Alzheimer's disease.
• tNIR therapy offers a novel approach to address sleep-related neurodegeneration and improve hippocampal function in AD models.