Tolerance to p53 by A2.1-restricted cytotoxic T lymphocytes

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Yeast As a Chassis for Developing Functional Assays to Study Human P53
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Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

M Theobald1, J Biggs, J Hernández

  • 1Department of Immunology, Scripps Research Institute, La Jolla, California 92037, USA.

The Journal of Experimental Medicine
|March 3, 1997
PubMed

Insights

T cell tolerance can hinder p53 immunotherapy. Researchers found that high-avidity T cells targeting wild-type p53 epitopes were eliminated in mice, suggesting a need to overcome this tolerance for effective cancer immunotherapy.

Area of Science:

  • Immunology
  • Oncology
  • Molecular Biology

Background:

  • The p53 protein is a tumor suppressor found in about 50% of human cancers, making it a promising target for cancer immunotherapy.
  • T cell tolerance to wild-type p53 antigens, due to low expression in normal tissues, presents a significant challenge for developing p53-specific immunotherapies and vaccines.

Purpose of the Study:

  • To investigate whether T cells are functionally tolerant of self-peptides derived from wild-type p53.
  • To explore the implications of this tolerance for the development of p53-targeted cancer immunotherapies.

Main Methods:

  • Utilized a mouse model combining p53-deficient (p53-/-) and wild-type (p53+/+) HLA-A2.1/Kb transgenic mice.
  • Assessed the generation and avidity of cytotoxic T lymphocytes (CTLs) specific for two distinct p53 self-epitopes (residues 187-197 and 261-269).

Main Results:

  • CTLs specific for the p53 epitope (187-197) were completely absent in p53+/+ mice, indicating functional tolerance.
  • CTLs specific for the p53 epitope (261-269) were detected in both p53-/- and p53+/+ mice, but with 10-fold lower avidity in p53+/+ mice.
  • These findings suggest the elimination of high-avidity CTLs specific for wild-type p53 epitopes.

Conclusions:

  • Functional tolerance to wild-type p53 epitopes can occur, particularly affecting high-avidity T cells.
  • Overcoming this T cell tolerance is likely essential for optimizing immunotherapies targeting p53 epitopes, especially in the context of HLA-A2.1 restriction.
  • This research provides critical insights for designing more effective cancer immunotherapies aimed at the p53 tumor suppressor protein.

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