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Incretins include glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP), which stimulate insulin secretion post-meals. In type 2 diabetes, GIP's efficacy is reduced, making GLP-1 a viable drug target. GIP originates from preproGIP.
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Deciphering the Molecular Dance: Exploring the Dynamic Interplay Between Mouse Insulin B9-23 Peptides and their

Aleksandra Antevska1, Kayla A Hess2, Connor C Long3

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Type 1 diabetes involves T cells attacking insulin peptides. We studied how mouse insulin B9-23 peptides and mutants aggregate, finding distinct behaviors that impact autoimmunity and EGCG inhibition.

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Area of Science:

  • Immunology
  • Biochemistry
  • Structural Biology

Background:

  • Type 1 diabetes stems from autoimmune destruction of pancreatic beta cells.
  • Autoreactive T cells recognize specific insulin B-chain peptides, like B9-23, as antigens.
  • Understanding the aggregation properties of these peptides is crucial for developing therapeutic strategies.

Purpose of the Study:

  • To investigate the aggregation behavior of mouse insulin B9-23 peptides and their mutants.
  • To explore the impact of these aggregation differences on interactions with epigallocatechin gallate (EGCG).
  • To establish a correlation between peptide aggregation and anti-islet autoimmunity.

Main Methods:

  • Characterization of mouse insulin 1 B9-23 (Ins1 B9-23), insulin 2 B9-23 (Ins2 B9-23), and mutants (Ins2 B9-23 Y16A, Ins2 B9-23 C19S).
  • Utilized drift tube ion mobility spectrometry-mass spectrometry (DTIMS-MS).
  • Employed transmission electron microscopy (TEM) and two-dimensional infrared spectroscopy (2D-IR).

Main Results:

  • Ins1 B9-23 and Ins2 Y16A mutant showed rapid fibril formation.
  • Ins2 B9-23 and Ins2 C19S mutant exhibited slower fibrillization with structural rearrangement.
  • EGCG effectively disrupted fibrils of Ins1 B9-23 and Y16A mutant but not Ins2 B9-23 and C19S mutant.

Conclusions:

  • Peptide aggregation behavior significantly influences interactions with amyloid inhibitors like EGCG.
  • Distinct aggregation patterns of insulin B9-23 peptides correlate with divergent effects on anti-islet autoimmunity.
  • These findings provide insights into the structural basis of autoimmune responses in Type 1 diabetes.