Abstract
The purified oxindole alkaloids, isomitraphylline and mitraphylline from Uncaria perrottetii, revealed their ability to break amyloid aggregates in vitro suggesting their therapeutic potentials in Alzheimer's disease (AD). Thioflavin-T assay for assessing amyloid-beta (Aβ) aggregation of these alkaloids exhibited inhibitions at 60.321% ± 2.61 (50μM) for isomitraphylline and 43.17% ± 3.48 (50μM) for mitraphylline. Neuroprotective effects were elaborated against Aβ-induced SH-SY5Y cells at 20μM and 10μM for isomitraphylline, and 20μM for mitraphylline. In addition, both alkaloids attenuated and protected the H2O2-induced SH-SY5Y cell cytotoxicity at 20μM. The intracellular ROS levels of SH-SY5Y cells from H2O2-induced oxidative stress were reduced at 20μM and 10μM, and the mitochondrial membrane potentials of Aβ-induced SH-SY5Y cells were protected at 20μM. The overall results suggested the potentials of both alkaloids to target certain pathological biomarkers of AD and could be further investigated as therapeutic or preventive drug leads against AD.
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