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Anthraquinones Inhibit Insulin Amyloidosis in Crowded Environments.

Jiaxing Zhang1,2, Wen Wang1, Zubiyan Yibula3

  • 1Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.

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Natural anthraquinones effectively inhibit insulin amyloid aggregation in dilute and crowded conditions. This research highlights their potential therapeutic value for protein misfolding diseases.

Keywords:
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Area of Science:

  • Biochemistry and Molecular Biology
  • Pharmacology

Background:

  • Natural anthraquinones exhibit diverse biological activities.
  • Limited research exists on their anti-amyloidogenic properties.
  • Amyloid protein aggregation is linked to various diseases.

Purpose of the Study:

  • To investigate the anti-amyloidogenic potential of five natural anthraquinones (emodin, anthraflavin, aloe-emodin, alizarin, purpurin).
  • To explore their inhibitory mechanisms on insulin amyloid fibrillation in dilute and crowded environments.
  • To correlate structural features with inhibitory capacity.

Main Methods:

  • Insulin amyloid fibrillation model.
  • Analysis in dilute and crowded environments (PEG 2000, PEG 4000).
  • Fluorescence spectroscopy and molecular simulations.

Main Results:

  • All five anthraquinones inhibited insulin amyloid fibrillation.
  • Crowded agents also suppressed aggregation but reduced anthraquinone efficacy, except for purpurin.
  • Anthraquinones bind to aggregation-prone insulin regions via hydrogen bonding and hydrophobic interactions.

Conclusions:

  • Natural anthraquinones possess significant anti-amyloidogenic activity.
  • Their efficacy is influenced by environmental conditions.
  • These compounds show promise for developing therapeutics against amyloid-associated proteinopathies.