Green tea polyphenolic compounds, (-)-epigallocatechin (EGC) and (-)-epicatechin-3-gallate (ECG), can diminish harmful Alzheimer's disease linked Aβ aggregates and ameliorate symptoms.
Green tea compounds EGC and ECG were tested for their effects on Cu/Zn-induced or self-assembled Aβ aggregation involved in Alzheimer's disease. To do so, a combination of thioflavine T fluorescent spectrometry, inductively coupled plasma mass spectrometry, UV-Vis spectroscopy, transmission electron microscopy, silver staining, immunohistochemistry, and immunofluorescence assays were utilized. Findings indicate that these compounds bind mildly to Cu and Zn and reduce their caused or self-assembled Aβ aggregates. Moreover, these compounds were shown to manage neurotoxicity in mouse neuroblastoma Neuro-2a cells by decreasing the production of reactive oxygen species (ROS).
From the findings, the EGC and ECG in green tea showed potential in reducing the toxicity of Aβ oligomers and fibrils which are heavily linked to Alzheimer's disease. Notably, ECG has the ability to traverse the blood-brain barrier and reduce Aβ plaques within the mouse brain, showcasing its potential for neuron protection. This study highlights the potential of green tea - specifically, its polyphenolic compounds - in the prevention or reduction of Alzheimer's disease symptoms.
