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Human islet amyloid polypeptide (IAPP) aggregation impairs islet transplantation. Porcine IAPP resists fibrillization due to structural differences, offering insights into xenotransplantation success.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Endocrinology

Background:

  • Islet transplantation is a potential therapy for type 2 diabetes.
  • Graft loss, often due to human islet amyloid polypeptide (hIAPP) aggregation, limits transplant success.
  • Porcine IAPP (pIAPP) may resist aggregation, explaining xenotransplant efficacy.

Purpose of the Study:

  • To investigate the molecular mechanisms behind differential IAPP aggregation.
  • To compare the folding dynamics and structural properties of hIAPP and pIAPP.

Main Methods:

  • Comparative replica-exchange molecular dynamics simulations.
  • Utilized Charmm22* force field and TIP4P/Ew explicit solvation.
  • Analyzed peptide structures and hydrogen bonding at physiological temperatures.

Main Results:

  • Both hIAPP and pIAPP predominantly adopt random-coil structures.
  • hIAPP showed a minor α-helix to β-sheet conversion, absent in pIAPP.
  • pIAPP's amyloidogenic segment 20-29 is depleted of β-sheet structures, unlike hIAPP, with more 3-helix contacts.

Conclusions:

  • pIAPP's structural features, particularly in the amyloidogenic region, confer resistance to aggregation.
  • These differences in pIAPP structure correlate with the absence of a β-sheet rich intermediate that drives hIAPP oligomerization.
  • Understanding these molecular differences is crucial for improving islet transplantation therapies.