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Regulation of insulin receptor functions by a peptide derived from a major histocompatibility complex class I antigen

J Stagsted1, G M Reaven, T Hansen

  • 1Receptron, Inc., Concord, California 94520.

Cell
|July 27, 1990
PubMed

Insights

A peptide from MHC class I molecules enhances glucose uptake and insulin effects by preventing receptor internalization. This suggests a non-immune role for MHC molecules in regulating cellular signaling.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cellular Biology

Background:

  • Major Histocompatibility Complex (MHC) class I molecules primarily known for immune functions.
  • Insulin signaling is crucial for glucose homeostasis.
  • Insulin receptor internalization regulates cellular response to insulin.

Purpose of the Study:

  • To investigate the non-immunological functions of MHC class I molecules.
  • To determine the effect of a specific MHC peptide (Dk-(61-85)) on insulin signaling and glucose uptake.
  • To elucidate the mechanism by which the peptide affects insulin receptor dynamics.

Main Methods:

  • Peptide synthesis and purification.
  • Measurement of cellular glucose uptake.
  • Analysis of insulin binding and receptor internalization.
  • In vivo studies in rats.

Main Results:

  • Dk-(61-85) peptide enhanced insulin-dependent glucose uptake by up to 50%.
  • The peptide prolonged insulin's effect and inhibited insulin receptor internalization, increasing plasma membrane receptors 2-3 fold.
  • Dk-(61-85) did not directly bind to glucose transporters and caused hypoglycemia in rats.

Conclusions:

  • MHC class I molecules possess non-immunological functions impacting ligand-activated receptor activity.
  • The Dk-(61-85) peptide modulates insulin signaling pathways, suggesting a novel role for MHC molecules in metabolic regulation.
  • These findings open new avenues for understanding MHC function beyond immunity.

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