Abstract
It has been described that using noninvasive exposure to 40-Hz white light LED reduces amyloid-beta, a peptide thought to initiate neurotoxic events in Alzheimer’s disease (AD). However, the mechanisms remain to be identified. Since AD impairs mitochondrial potassium channels and respiratory chain activity, the objectives of the current study were to determine the effect of 40-Hz white light LED on structure–function of mitoKATP channel and brain mitochondrial respiratory chain activity, production of reactive oxygen species (ROS), and ΔΨm in AD. Single mitoKATP channel was considered using a channel incorporated into the bilayer lipid membrane and expression of mitoKATP-Kir6.1 subunit as a pore-forming subunit of the channel was determined using a western blot analysis in Aβ1-42 toxicity and light-treated rats. Our results indicated a severe decrease in mito-KATP channel permeation and Kir6.1 subunit expression coming from the Aβ1-42-induced neurotoxicity. Furthermore, we found that Aβ1-42-induced neurotoxicity decreased activities of complexes I and IV and increased ROS production and ΔΨm. Surprisingly, light therapy increased channel permeation and mitoKATP-Kir6.1 subunit expression. Noninvasive 40-Hz white light LED treatment also increased activities of complexes I and IV and decreased ROS production and ΔΨm up to ~ 70%. Here, we report that brain mito-KATP channel and respiratory chain are, at least in part, novel targets of 40-Hz white light LED therapy in AD.
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Data Availability
Data and material are available upon request to the corresponding author.
Abbreviations
- AD:
-
Alzheimer’s disease
- Aβ:
-
Beta amyloid
- PBMT:
-
Photobiomodulation therapy
- LED:
-
Light-emitting diode
- MitoKATP channel:
-
Mitochondrial ATP-sensitive potassium channel
- ROS:
-
Reactive oxygen species
- ΔΨm :
-
Mitochondrial membrane potential
- ICV:
-
Intracerebroventricular
- STL:
-
Step-through latency
- TDC:
-
Time spent in the dark compartment
- TLC:
-
Thin-layer chromatography
- BLM:
-
Bilayer lipid membrane
- COX:
-
Cytochrome oxidase
- ETC:
-
Electron transport chain
- Complex I:
-
NADH-CoQ oxidoreductase
- Complex IV:
-
Cytochrome c oxidase
- CoQ:
-
Coenzyme Q
- DCFH-DA:
-
2′,7′-Dichlorofluorescein diacetate
- Rh 123:
-
Rhodamine 123
- Po:
-
Open probability
- V 1/2 :
-
Voltage for half-maximal activation
- z d :
-
Equivalent gating charge
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This work was supported by a grant from the Neurophysiology Research Center of Shahid Beheshti University of Medical Sciences.
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M.N.: investigation, formal analysis, resources, writing original draft; T.V-S.: software, resources; NT: formal analysis, resources; J.F-B: formal analysis; R.S.: resources; F.K.: resources, project administration; A.E.: conceptualization, supervision, writing—review and editing, project administration.
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All experiments were conducted according to the Guide for Care and Use of Laboratory Animals (National Institutes of Health Publication No. 80–23, revised 1996). Additionally, all procedures were reviewed and confirmed by the Research and Ethics Committee of Shahid Beheshti University of Medical Sciences (IR.SBMU.MSP.REC.1398.109).
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Highlights
• Structure–function of brain mitoKATP channel is severely damaged in an Aβ toxicity model.
• Our study suggests certain mechanisms account for the effects of Aβ toxicity on mitochondria.
• Forty-Hertz white light therapy modifies mitoKATP structure–function in Aβ toxicity rats.
• Forty-Hertz white light improves respiratory chain activity, ROS, and ΔΨm in Aβ toxicity rats.
• Our study suggests a mechanism for the efficacy of 40-Hz light therapy in Aβ toxicity rats.
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Nazari, M., Vajed-Samiei, T., Torabi, N. et al. The 40-Hz White Light-Emitting Diode (LED) Improves the Structure–Function of the Brain Mitochondrial KATP Channel and Respiratory Chain Activities in Amyloid Beta Toxicity. Mol Neurobiol 59, 2424–2440 (2022). https://doi.org/10.1007/s12035-021-02681-7
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DOI: https://doi.org/10.1007/s12035-021-02681-7