Abstract
Purpose: There is evidence that some tumor patients are able to generate tumor-associated antigen (TAA)-specific T-cell immunity spontaneously. However, little is understood about the existence and nature of self-reactive T-cells that recognize TAA in healthy donors (HD). Methods: Human mucin (MUC-1), a highly glycosylated transmembrane protein, is a well characterized TAA expressed by epithelial tumors. We compared endogenous MUC-1-specific T-cell immunity of breast cancer patients (BCP) and healthy volunteers using two MUC-1-derived HLA-A*0201-restricted peptides (MUC-1950–958, MUC-112–20). Antigen-dependent interferon (IFN)-γ and Granzyme B expression of T-cells were analysed by a reverse transcription-polymerase chain reaction (qRT-PCR)-based assay. Results: A 32% of BCP and 43% of healthy volunteers revealed pre-existent CD8+ T-cells specific for MUC-1950–958 but not for MUC-112–20. In patients, MUC-1-specific T-cells have been detected mainly in early stage disease prior adjuvant therapy. Those T-cells showed MUC-1-dependent IFN-γ production after short-term stimulation but no clear Granzyme B expression. However, after repetitive in vitro stimulations using peptide-pulsed CD40-stimulated B-cell lines as autologous antigen presenting cells (APC) T-cell lines exhibited lytic capacity against HLA-A*0201+/MUC-1+ tumor cells. Conclusion: MUC-1950–958 is a dominant tumor antigen against which CD8+ T-cells were found frequently in BCP as well as in HD. Until now, this was only known for MelanA/MART-1. In contrast to previous reports, MUC-1-specific immunity was not linked to gender or number of pregnancies in women. Whether MUC-1950–958-related immunity highlights a yet unknown cross-reactivity in HD remains unclear. The presence of MUC-1-specific T-cells in some BCP may reflect a balance between immune tolerance and immune defence during aetiopathology.
Abbreviations
- APC:
-
Antigen presenting cell
- BCP:
-
Breast cancer patient
- Cpm:
-
Counts per minute
- CTL:
-
Cytotoxic T-Lymphocytes
- DC:
-
Dendritic cell
- DMSO:
-
Dimethylsulfoxid
- EBV:
-
Ebstein/barr virus
- F:
-
Female
- FCS:
-
Fetal calf serum
- HCMV:
-
Human cytomegaly virus
- HD:
-
Healthy donor
- HLA:
-
Human leucocyte antigen
- IFN:
-
Interferon
- IL:
-
Interleukin
- M:
-
Male
- MUC-1:
-
Mucin-1
- n.t.:
-
Not tested
- PBL:
-
Peripheral blood lymphocytes
- PBMC:
-
Peripheral blood mononuclear cells
- qRT-PCR:
-
Quantitative real time polymerase chain reaction
- TAA:
-
Tumor associated antigen
- TxNxMx:
-
Clinical classification concerning tumor-, nodal-, and metastases-status
- VNTR:
-
Variable number of tandem repeat
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Acknowledgments
We thank Cécile Gouttefangeas for support, input and helpful discussions. We further acknowledge the expert technical assistance of Beatrice Hoffmann. Our thanks to all the patients and healthy volunteers who agreed to participate in this study. Supported by Grants from the Angewandte Klinische Forschung (AKF)-Programm of the University of Tübingen (Grant 64-0-0) and from the Deutsche Forschungsgemeinschaft (Grant GU 511/2-1).
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Brigitte Gückel and Christine Rentzsch contributed equally to this study.
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Gückel, B., Rentzsch, C., Nastke, MD. et al. Pre-existing T-cell immunity against mucin-1 in breast cancer patients and healthy volunteers. J Cancer Res Clin Oncol 132, 265–274 (2006). https://doi.org/10.1007/s00432-005-0064-6
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DOI: https://doi.org/10.1007/s00432-005-0064-6