Prostate-specific antigen-derived epitopes capable of inducing cellular and humoral responses in HLA-A24+ prostate cancer patients

Prostate. 2003 Oct 1;57(2):152-9. doi: 10.1002/pros.10280.

Abstract

Background: We tried to identify prostate-specific antigen (PSA)-derived epitopes immunogenic in HLA-A24+ prostate cancer patients.

Methods: Peripheral blood mononuclear cells (PBMCs) were in vitro stimulated with each of four different PSA peptides carrying the HLA-A24 binding motif, and their HLA-A24-restricted anti-tumor responses were examined using a parental HLA-A24-negative prostate cancer cell line (PC93) and its HLA-A24-expressing transfectant line (PC93-A24). Serum levels of immunoglobulin G (IgG) against PSA peptides were measured by enzyme-linked immunosorbent assay (ELISA).

Results: PBMCs, which were in vitro stimulated with either the PSA(152-160) or PSA(248-257) peptide, showed higher levels of IFN-gamma production and cytotoxicity against the PC93-A24 than against the PC93. IgG against the PSA(248-257) peptide was detected in half of the prostate cancer patients tested.

Conclusions: The PSA(152-160) and PSA(248-257) peptides could be appropriate target molecules in use for specific immunotherapy of HLA-A24+ prostate cancer patients.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antibody Formation
  • Epitopes*
  • HLA-A Antigens / analysis*
  • HLA-A24 Antigen
  • Humans
  • Immunity, Cellular
  • Immunoglobulin G / analysis
  • Immunoglobulin G / immunology
  • Male
  • Peptide Fragments / immunology
  • Prostate-Specific Antigen / chemistry
  • Prostate-Specific Antigen / immunology*
  • Prostatic Neoplasms / immunology*
  • T-Lymphocytes, Cytotoxic / immunology
  • Tissue Donors

Substances

  • Epitopes
  • HLA-A Antigens
  • HLA-A24 Antigen
  • Immunoglobulin G
  • Peptide Fragments
  • Prostate-Specific Antigen