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Cross-sequence interactions between human and rat islet amyloid polypeptides.

Rundong Hu1, Mingzhen Zhang, Kunal Patel

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Summary
This summary is machine-generated.

Rat IAPP initially inhibits human IAPP aggregation but later promotes hybrid fibril formation. This cross-interaction increases toxicity, offering insights into type 2 diabetes pathogenesis.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • Human islet amyloid polypeptide (hIAPP) aggregation into toxic species is linked to type 2 diabetes.
  • Rat IAPP (rIAPP), despite sequence similarity, is non-amyloidogenic, but its interaction with hIAPP is poorly understood.

Purpose of the Study:

  • To investigate the impact of cross-sequence interactions between hIAPP and rIAPP on amyloid formation, aggregation kinetics, and cellular toxicity.
  • To elucidate the role of rIAPP in modulating hIAPP aggregation pathways.

Main Methods:

  • Combined computational (Molecular Dynamics simulations) and experimental approaches.
  • Analysis of hybrid amyloid structures, aggregation kinetics, and cell viability assays.

Main Results:

  • rIAPP initially inhibits hIAPP aggregation and nuclei formation.
  • hIAPP seeds can recruit both peptides, leading to hybrid fibril formation and promoting ultimate fibrillation.
  • Coincubation decreases cell viability, suggesting the formation of toxic hybrid oligomers.
  • MD simulations indicate cross-interactions stabilize beta-sheet structures, promoting fibrillization.

Conclusions:

  • rIAPP exhibits a dual role in hIAPP aggregation, initially inhibitory but ultimately promoting hybrid fibril formation.
  • Cross-amyloid interactions between hIAPP and rIAPP contribute to increased toxicity and provide critical insights into protein aggregation mechanisms.