Related Experiment Video
Updated: Apr 18, 2026
Intracerebroventricular Injection of Amyloid-β Peptides in Normal Mice to Acutely Induce Alzheimer-like Cognitive Deficits
Published on: March 16, 2016
Methylene Blue Improves Brain Mitochondrial ABAD Functions and Decreases Aβ in a Neuroinflammatory Alzheimer's
Aya Zakaria1, Nabila Hamdi1, Reham Mahmoud Abdel-Kader2
1Department of Pharmacology & Toxicology, Faculty of Pharmacy and Biotechnology, German University in Cairo, Cairo, Egypt.
Abstract:
Methylene blue (MB) phase II clinical trials reported improvements in cognitive functions of Alzheimer's disease (AD) patients. Regarding MB mechanism of action, its antioxidant and mitochondrial protective effects have been previously described. In relation to AD, it has been recently reported that MB reduced amyloid beta (Aβ) levels in AD models. The mitochondrial enzyme amyloid-binding alcohol dehydrogenase (ABAD) has been shown to bind Aβ inducing mitochondrial dysfunction, providing a direct relation between Aβ toxicity and mitochondrial dysfunction occurring in AD. Since it has been reported that inhibiting ABAD protects mitochondrial functions and prevents Aβ-induced toxicity, the aim of the current study was to investigate if the protective effects of MB could be associated with an effect on ABAD levels and functions. The current study shows that MB is able to enhance cell viability, reduce both reactive oxygen species levels and importantly Aβ oligomers in a lipopolysaccharide (LPS) mouse model. Interestingly, ABAD levels were increased in the brains of the LPS mouse model and MB treatment was able to reduce its levels. Given that regulation of the estradiol level is a well-established function of ABAD, brain estradiol level was compared in LPS mouse model and in MB-treated mice. The results of the current study show that MB treatment is able to improve significantly the LPS-induced decrease of estradiol levels in mice brains, indicating its ability to modulate both levels and function of ABAD. These results give a new insight to possible mechanisms of MB in AD.
Insights
Methylene blue (MB) shows promise for Alzheimer's disease (AD) by reducing amyloid beta and improving cognitive function. This study reveals MB modulates the ABAD enzyme, potentially restoring brain estradiol levels.
Area of Science:
- Neuroscience
- Pharmacology
- Biochemistry
Background:
- Methylene blue (MB) clinical trials suggest cognitive benefits for Alzheimer's disease (AD) patients.
- MB exhibits antioxidant and mitochondrial protective effects, and has been shown to reduce amyloid beta (Aβ) in AD models.
- The enzyme amyloid-binding alcohol dehydrogenase (ABAD) binds Aβ, causing mitochondrial dysfunction relevant to AD pathogenesis.
Purpose of the Study:
- To investigate if Methylene blue's protective effects in Alzheimer's disease models are linked to its influence on ABAD levels and function.
- To explore the relationship between MB, Aβ, mitochondrial dysfunction, and ABAD in an Alzheimer's disease context.
Main Methods:
- Utilized a lipopolysaccharide (LPS) mouse model to mimic aspects of Alzheimer's disease.
- Assessed cell viability, reactive oxygen species (ROS) levels, Aβ oligomers, ABAD levels, and brain estradiol levels.
- Administered Methylene blue (MB) treatment to the LPS-induced mouse model.
Main Results:
- Methylene blue (MB) enhanced cell viability and reduced ROS and Aβ oligomers in the LPS mouse model.
- Increased ABAD levels in LPS-treated mice were significantly reduced by MB treatment.
- MB treatment normalized the decrease in brain estradiol levels observed in the LPS model, indicating modulation of ABAD activity.
Conclusions:
- Methylene blue (MB) demonstrates neuroprotective effects in an Alzheimer's disease model, partly through modulating ABAD levels and function.
- MB's ability to reduce Aβ oligomers and restore estradiol levels offers new insights into its therapeutic mechanisms for AD.
- These findings highlight a potential therapeutic pathway for Alzheimer's disease involving the ABAD enzyme and Methylene blue.
More Related Videos
10:52Correlative Light and Electron Microscopy to Study Microglial Interactions with β-Amyloid Plaques
Published on: June 1, 2016
06:41Quantitative Analysis of Mitochondria-Associated Endoplasmic Reticulum Membrane (MAM) Stabilization in a Neural Model of Alzheimer's Disease (AD)
Published on: January 10, 2025