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Differentiation-stage specific self-peptides bound by major histocompatibility complex class I molecules

P E Harris1, F Lupu, B Hong

  • 1College of Physicians and Surgeons of Columbia University, Department of Pathology, New York 10032.

The Journal of Experimental Medicine
|March 1, 1993
PubMed
Summary

Cellular differentiation involves presenting new peptides on major histocompatibility complex (MHC) class I molecules. This study shows U937 cells express differentiation-specific peptides during macrophage development, indicating a link between cellular development and MHC presentation.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Phenotypic changes during cellular development are often linked to altered protein expression.
  • Major histocompatibility complex (MHC) class I molecules present peptides on cell surfaces, crucial for immune surveillance.
  • The U937 cell line differentiates from monoblasts to macrophage-like cells upon phorbol myristate acetate (PMA) treatment.

Purpose of the Study:

  • To investigate whether phenotypic differentiation is accompanied by the expression of differentiation-stage specific peptides bound to MHC class I molecules.
  • To identify specific peptides presented by U937 cells during PMA-induced differentiation.

Main Methods:

  • U937 cells were cultured with and without PMA to induce differentiation.
  • MHC class I molecules were purified from treated and untreated cells.

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  • Peptides eluted from MHC class I molecules were analyzed using high-performance liquid chromatography (HPLC).
  • Eluted peptides were chemically sequenced to identify their origin.

    • Main Results:

    • HPLC profiles of eluted peptides differed between PMA-treated and untreated U937 cells.
    • A cytomegalovirus-derived peptide was identified in both groups.
    • A peptide derived from interleukin 1 beta was uniquely identified in PMA-treated cells.
    • This indicates the presentation of a differentiation-stage specific peptide.

    Conclusions:

    • Cellular differentiation, exemplified by U937 cell maturation, is associated with the presentation of specific peptides on MHC class I molecules.
    • Similar to viral infection, cellular development and transformation involve the de novo synthesis and presentation of proteins on MHC class I.
    • This finding suggests a broader role for MHC class I antigen presentation in monitoring cellular status beyond pathogen detection.