Abstract
Aggregation of amyloid-beta protein (Aβ) is a key pathogenic event in Alzheimer’s disease (AD). Curcumin, a constituent of the Indian spice Turmeric is structurally similar to Congo Red and has been demonstrated to bind Aβ amyloid and prevent further oligomerization of Aβ monomers onto growing amyloid β-sheets. Reasoning that oligomerization kinetics and mechanism of amyloid formation are similar in Parkinson’s disease (PD) and AD, we investigated the effect of curcumin on α-synuclein (AS) protein aggregation. In vitro model of AS aggregation was developed by treatment of purified AS protein (wild-type) with 1 mM Fe3+ (Fenton reaction). It was observed that the addition of curcumin inhibited aggregation in a dose-dependent manner and increased AS solubility. The aggregation-inhibiting effect of curcumin was next investigated in cell culture utilizing catecholaminergic SH-SY5Y cell line. A model system was developed in which the red fluorescent protein (DsRed2) was fused with A53T mutant of AS and its aggregation examined under different concentrations of curcumin. To estimate aggregation in an unbiased manner, a protocol was developed in which the images were captured automatically through a high-throughput cell-based screening microscope. The obtained images were processed automatically for aggregates within a defined dimension of 1–6 μm. Greater than 32% decrease in mutant α-synuclein aggregation was observed within 48 h subsequent to curcumin addition. Our data suggest that curcumin inhibits AS oligomerization into higher molecular weight aggregates and therefore should be further explored as a potential therapeutic compound for PD and related disorders.
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Abbreviations
- AS:
-
alpha-Synuclein
- PD:
-
Parkinson’s disease
- DLB:
-
Dementia with Lewy bodies
- AD:
-
Alzheimer’s disease
- Aβ:
-
Amyloid beta-protein
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Acknowledgments
We would like to thank Dr. Michele Goedert for the AS construct. We are grateful to Dr. John Trojanowski for antibodies. We would like to thank Dr. Alfred Heller for gifting the MN9D cell line. This work was supported by grants from the American Federation on Aging Research and the National Institute on Aging (K08 AG20764). Dr. Galvin is a recipient of the Paul Beeson Physician Faculty Scholar Award in Aging Research. This project was also supported by generous gifts from the Alan A. and Edith L. Wolff Charitable Trust and the Blue Gator Foundation. Dr. Pandey was partly supported by Missouri Alzheimer Disease and Related Disorder Program for this work.
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Pandey, N., Strider, J., Nolan, W.C. et al. Curcumin inhibits aggregation of α-synuclein. Acta Neuropathol 115, 479–489 (2008). https://doi.org/10.1007/s00401-007-0332-4
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DOI: https://doi.org/10.1007/s00401-007-0332-4