T cell-mediated cytotoxicity against p53-protein derived peptides in bulk and limiting dilution cultures of healthy donors

TY - JOUR

T1 - T cell-mediated cytotoxicity against p53-protein derived peptides in bulk and limiting dilution cultures of healthy donors

AU - Röpke, M

AU - Regner, M

AU - Claesson, M H

AU - Claesson, Mogens Helweg

PY - 1995/7/1

Y1 - 1995/7/1

N2 - The p53 tumour suppressor gene product plays an important role in the development of most human cancers. Point mutations in the p53 gene are common in malignant states and results in over-expression of wild type and mutant determinants of the p53 protein. This process might generate MHC-I restricted epitopes for T cell recognition and p53-derived peptides have been suggested as targets for tumour-specific cytotoxic T lymphocytes (CTL). Our primary aim was to estimate the frequencies of p53-peptide reactive CTL precursors (CTLp) in peripheral blood from healthy young individuals. We selected wild type and mutated peptides derived from the p53 sequence with a binding motif for HLA-A2.1 molecules. Peripheral blood mononuclear cells (PBMC) from healthy HLA-A2 donors were stimulated in vitro in bulk cultures as well as in limiting dilution cultures using autologous cells pulsed with p53 peptides as stimulator cells. T cell reactivity was observed towards both wild type and mutated p53 peptide epitopes with CTL precursor frequencies varying from 1:2 x 10(4) to 1:1.5 x 10(5). These results might suggest the presence of an ongoing immune response in normal individuals against cells expressing increased levels of p53 protein.

AB - The p53 tumour suppressor gene product plays an important role in the development of most human cancers. Point mutations in the p53 gene are common in malignant states and results in over-expression of wild type and mutant determinants of the p53 protein. This process might generate MHC-I restricted epitopes for T cell recognition and p53-derived peptides have been suggested as targets for tumour-specific cytotoxic T lymphocytes (CTL). Our primary aim was to estimate the frequencies of p53-peptide reactive CTL precursors (CTLp) in peripheral blood from healthy young individuals. We selected wild type and mutated peptides derived from the p53 sequence with a binding motif for HLA-A2.1 molecules. Peripheral blood mononuclear cells (PBMC) from healthy HLA-A2 donors were stimulated in vitro in bulk cultures as well as in limiting dilution cultures using autologous cells pulsed with p53 peptides as stimulator cells. T cell reactivity was observed towards both wild type and mutated p53 peptide epitopes with CTL precursor frequencies varying from 1:2 x 10(4) to 1:1.5 x 10(5). These results might suggest the presence of an ongoing immune response in normal individuals against cells expressing increased levels of p53 protein.

KW - Adult

KW - Amino Acid Sequence

KW - Cells, Cultured

KW - Cytotoxicity Tests, Immunologic

KW - Epitopes

KW - HLA-A2 Antigen

KW - Humans

KW - Lymphocyte Count

KW - Molecular Sequence Data

KW - Protein Binding

KW - T-Lymphocytes, Cytotoxic

KW - Tumor Suppressor Protein p53

M3 - Journal article

C2 - 7543215

SN - 0301-6323

VL - 42

SP - 98

EP - 103

JO - Scandinavian Journal of Immunology, Supplement

JF - Scandinavian Journal of Immunology, Supplement

IS - 1

ER -