TY - JOUR
T1 - Antagonistic Activity of Naphthoquinone-Based Hybrids toward Amyloids Associated with Alzheimer's Disease and Type-2 Diabetes
AU - Paul, Ashim
AU - Viswanathan, Guru Krishnakumar
AU - Mahapatra, Satabdee
AU - Balboni, Gianfranco
AU - Pacifico, Salvatore
AU - Gazit, Ehud
AU - Segal, Daniel
N1 - Publisher Copyright: Copyright © 2019 American Chemical Society.
PY - 2019/8/21
Y1 - 2019/8/21
N2 - Protein misfolding and amyloid formation are associated with various human diseases including Alzheimer's disease (AD), Parkinson's disease (PD), and Type-2 Diabetes mellitus (T2DM). No disease-modifying therapeutics are available for them. Despite the lack of sequence homology between the corresponding proteins, aromatic residues are recognized as common key motifs in the formation and stabilization of amyloid structures via π-πstacking. Thus, targeting aromatic recognition interfaces could be a useful approach for inhibiting amyloid formation as well as disrupting the preformed amyloid fibrils. Combining experimental and computational approaches, we demonstrated the anti-amyloidogenic effect of naphthoquinone-tryptophan-based hybrid molecules toward PHF6 (τ-derived aggregative peptide), Amyloid β (Aβ42), and human islet amyloid polypeptide (hIAPP) implicated in AD and T2DM, respectively. These hybrid molecules significantly inhibited the aggregation and disrupted their preformed fibrillar aggregates in vitro, in a dose-dependent manner as evident from Thioflavin T/S binding assay, CD spectroscopy, and electron microscopy. Dye leakage assay from LUVs and cell-based experiments indicated that the hybrid molecules inhibit membrane disruption and cytotoxicity induced by these amyloids. Furthermore, in silico studies provided probable mechanistic insights into the interaction of these molecules with the amyloidogenic proteins in their monomeric or aggregated forms, including the role of hydrophobic interaction, hydrogen bond formation, and packing during inhibition of aggregation and fibril disassembly. Our findings may help in designing novel therapeutics toward AD, T2DM, and other proteinopathies based on the naphthoquinone derived hybrid molecules.
AB - Protein misfolding and amyloid formation are associated with various human diseases including Alzheimer's disease (AD), Parkinson's disease (PD), and Type-2 Diabetes mellitus (T2DM). No disease-modifying therapeutics are available for them. Despite the lack of sequence homology between the corresponding proteins, aromatic residues are recognized as common key motifs in the formation and stabilization of amyloid structures via π-πstacking. Thus, targeting aromatic recognition interfaces could be a useful approach for inhibiting amyloid formation as well as disrupting the preformed amyloid fibrils. Combining experimental and computational approaches, we demonstrated the anti-amyloidogenic effect of naphthoquinone-tryptophan-based hybrid molecules toward PHF6 (τ-derived aggregative peptide), Amyloid β (Aβ42), and human islet amyloid polypeptide (hIAPP) implicated in AD and T2DM, respectively. These hybrid molecules significantly inhibited the aggregation and disrupted their preformed fibrillar aggregates in vitro, in a dose-dependent manner as evident from Thioflavin T/S binding assay, CD spectroscopy, and electron microscopy. Dye leakage assay from LUVs and cell-based experiments indicated that the hybrid molecules inhibit membrane disruption and cytotoxicity induced by these amyloids. Furthermore, in silico studies provided probable mechanistic insights into the interaction of these molecules with the amyloidogenic proteins in their monomeric or aggregated forms, including the role of hydrophobic interaction, hydrogen bond formation, and packing during inhibition of aggregation and fibril disassembly. Our findings may help in designing novel therapeutics toward AD, T2DM, and other proteinopathies based on the naphthoquinone derived hybrid molecules.
KW - Alzheimer's disease
KW - Aβ
KW - IAPP
KW - Type 2 diabetes
KW - aggregation
KW - τ-protein
UR - http://www.scopus.com/inward/record.url?scp=85071708252&partnerID=8YFLogxK
U2 - https://doi.org/10.1021/acschemneuro.9b00123
DO - https://doi.org/10.1021/acschemneuro.9b00123
M3 - مقالة
SN - 1948-7193
VL - 10
SP - 3510
EP - 3520
JO - ACS Chemical Neuroscience
JF - ACS Chemical Neuroscience
IS - 8
ER -