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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
Amyloid deposits were observed as early as 1639 in the liver and the spleen.   In 1854, Rudolph Virchow performed iodine staining,...
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A Spectroscopic Marker for Structural Transitions Associated with Amyloid-β Aggregation.

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A novel fluorescent dye, TPE-TPP, distinguishes between amyloid-beta (Aβ) aggregation intermediates, including toxic species relevant to Alzheimer's disease. This dye offers a new diagnostic tool for studying amyloid formation and screening potential inhibitors.

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Materials Science

Background:

  • Amyloid aggregates, implicated in diseases like Alzheimer's, form through various intermediates with distinct structures and toxicities.
  • Early oligomeric amyloid-beta (Aβ) species are highly cytotoxic but challenging to identify due to their transient nature.
  • Conventional methods like thioflavin T lack specificity in differentiating Aβ aggregation stages.

Purpose of the Study:

  • To introduce a novel fluorescent dye, bis(triphenylphosphonium) tetraphenylethene (TPE-TPP), for identifying and characterizing Aβ aggregation intermediates.
  • To demonstrate the capability of TPE-TPP to differentiate between various Aβ aggregate species based on their fluorescence properties.
  • To explore the potential of TPE-TPP as a diagnostic tool for amyloid aggregation and inhibitor screening.

Main Methods:

  • Utilized the fluorescent dye TPE-TPP to monitor amyloid-beta (Aβ) aggregation.
  • Analyzed steady state fluorescence and fluorescence lifetime characteristics of TPE-TPP in the presence of different Aβ species.
  • Correlated TPE-TPP fluorescence data with known structural features of Aβ intermediates from solid-state NMR spectroscopy.

Main Results:

  • TPE-TPP identified at least three distinct Aβ aggregation intermediates.
  • Distinct fluorescence signatures (emission maxima and lifetimes) were observed for small oligomers, intermediate species, and fibrils.
  • Small oligomers: λmax = 465 nm, τFl = 3.58 ± 0.04 ns; Intermediates: λmax = 452 nm, τFl = 3.00 ± 0.03 ns; Fibrils: λmax = 406 nm, τFl = 5.19 ± 0.08 ns.

Conclusions:

  • TPE-TPP serves as a sensitive probe for distinguishing between different amyloid-beta (Aβ) aggregation states.
  • This fluorescence-based method provides a valuable diagnostic tool for studying toxic Aβ aggregates.
  • TPE-TPP holds promise for screening compounds that inhibit amyloid aggregation, potentially aiding in Alzheimer's disease research.