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Far-Infrared Radiation Ameliorates the Cognitive Dysfunction in an Alzheimer's Disease Transgenic Mouse via Modulating Jak-2/Stat3 and Nrf-2/HO-1 Pathways

Abstract

This study applied a far-infrared (FIR) irradiation protocol using the patented EEFIT LITE® device, which emits a precisely defined and stabilized spectrum within the 4–20 μm range, a bandwidth known for its specific biological effects. The accurate spectral output serves as the core technical parameter of this device. The aim of this research was to systematically evaluate its neuroprotective effects.

Objective

Alzheimer's disease currently has no cure, and existing medications can only temporarily alleviate symptoms, often accompanied by side effects. Researchers have been seeking safe, non-pharmacological adjunctive therapies. This study investigated whether FIR irradiation can improve memory and learning abilities in a mouse model of Alzheimer's disease and explored the underlying mechanisms of action.

Methods

The research team adopted a non-pharmacological physical therapy approach, using TgCRND8 transgenic mice, which spontaneously develop brain pathologies similar to those seen in human Alzheimer's disease. The mice received daily FIR irradiation with a specific spectral bandwidth for 28 days. At the end of the treatment period, memory function was assessed using the Morris water maze test to evaluate the therapeutic effects on Alzheimer's disease pathology.

Key Findings

1. Improvement in learning and memory impairments

Alzheimer's disease mice that received FIR irradiation with a specific spectral bandwidth showed significantly faster target-finding speeds in memory tests, with notable improvements in spatial learning and memory abilities. Their performance in the tests approached that of normal wild-type mice, indicating clear benefits in cognitive function.

FIR-irradiated mice spent a comparable amount of time in the platform-containing quadrant as normal mice, demonstrating improved memory performance.

2. Reduction of Aβ plaque deposits in the brain and inhibition of Aβ plaque formation, contributing to improved cognitive function related to spatial memory
FIR irradiation reduced the accumulation of amyloid-beta (Aβ) plaques in the brain, while simultaneously decreasing the production of Aβ protein and enhancing its clearance efficiency, thereby inhibiting abnormal plaque formation through two complementary pathways.

FIR-irradiated mice showed a significant reduction in Aβ protein plaques, which contributed to improved cognitive function related to spatial memory.

3. Inhibition of tau protein phosphorylation in the brain, helping to reduce neurodegeneration
FIR irradiation reduced hyperphosphorylation of tau protein in the brain, which helped decrease the formation of neurofibrillary tangles and provided protection to neurons.

FIR-irradiated mice exhibited markedly reduced tau protein phosphorylation in the hippocampal region of the brain, helping to mitigate neurodegeneration.

4. Inhibition of neuroinflammation in the brain
FIR irradiation prevented excessive activation of brain immune cells, reduced the production of inflammatory mediators, and effectively alleviated neuroinflammation. It achieved this by both blocking pro-inflammatory signaling pathways and activating cellular antioxidant pathways, thereby suppressing neuroinflammation through the regulation of two key signaling routes.

FIR-irradiated mice had significantly lower densities of inflammatory cells in the cerebral cortex and hippocampus, contributing to the suppression of neuroinflammation in the brain.

Conclusion

This study demonstrates that FIR irradiation within a specific spectral band can simultaneously regulate multiple pathological pathways—including Aβ deposition, Tau phosphorylation, and neuroinflammation—through physical intervention, exerting synergistic ameliorative effects. It helps improve learning and memory deficits, enhances cognitive function related to spatial memory, reduces neurodegeneration, and suppresses neuroinflammation in the brain. These findings highlight its significant potential as a non-pharmacological therapeutic approach for Alzheimer's disease.

Read the paper: Far-Infrared Radiation Ameliorates the Cognitive Dysfunction in an Alzheimer's Disease Transgenic Mouse via Modulating Jak-2/Stat3 and Nrf-2/HO-1 Pathways