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Title: Polyphenolic compounds are novel protective agents against lipid membrane damage by alpha-synuclein aggregates in vitro
Authors: Caruana, Mario
Neuner, Johanna
Hogen, Tobias
Schmidt, Felix
Famp, Frits
Scerri, Charles
Giese, Armin
Vassallo, Neville
Keywords: Polyphenols
Parkinson's disease
Issue Date: 2012
Publisher: Elsevier BV
Citation: Caruana, M., Neuner, J., Hogen, T., Schmidt, F., Famp, F., Scerri, C., Giese, A., & Vassallo, N. (2012). Polyphenolic compounds are novel protective agents against lipid membrane damage by alpha-synuclein aggregates in vitro. Biochimica et Biophysica Acta (BBA) – Biomembranes, 1818(11), 2502-2510.
Abstract: Cumulative evidence now suggests that the abnormal aggregation of the protein α-synuclein (αS) is a critical factor in triggering neurodegeneration in Parkinson's disease (PD). In particular, a fundamental pathogenetic mechanism appears to involve targeting of neuronal membranes by soluble oligomeric intermediates of αS, leading to their disruption or permeabilisation. Therefore, a model assay was developed in which fluorophore-loaded unilamellar vesicles were permeabilised by soluble oligomers, the latter formed by aggregation of human recombinant αS protein. The αS oligomers induced an impairment of membrane integrity similar to that of the pore-forming bacterial peptide gramicidin. The lipid vesicle permeabilisation assay was then utilised to screen 11 natural polyphenolic compounds, 8 synthetic N′-benzylidene-benzohydrazide compounds and black tea extract for protection against membrane damage by wild-type and mutant (A30P, A53T) synuclein aggregates. A select group of potent inhibitory compounds included apigenin, baicalein, morin, nordihydroguaiaretic acid, and black tea extract. Structure–activity analysis further suggests that a 5,7-dihydroxy-chromen-4-one moiety appears to be favourable for the inhibition reaction. In conclusion, we have identified a group of polyphenols that can effectively hinder membrane damage by αS aggregates. These may serve as a viable source of lead compounds for the development and design of novel therapeutic agents in PD.
Appears in Collections:Scholarly Works - FacM&SPat
Scholarly Works - FacM&SPB

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