Abstract
The recent success of checkpoint inhibitors in the treatment of Merkel cell carcinoma (MCC) confirms that MCC tumors can be immunogenic. However, no treatment directly targeting the tumor is available for use in combination with these checkpoint inhibitors to enhance their efficacity. This study was carried out to characterize MCC line sensitivity to cellular lysis and to identify cell surface antigens that could be used for direct targeting of this tumor. For five representative MCC lines, the absence or low expression of MICA, MICB, HLA-I, and ICAM-1 was associated with low level of recognition by NK cells and T lymphocytes. However, expression of HLA-I and ICAM-1 and sensitivity to cellular lysis could be restored or increased after exposure to INFγ. We tested 41 antibodies specific for 41 different antigens using a novel antibody-dependent cellular cytotoxicity (ADCC) screening system for target antigens. Anti-CD326 (EpCAM) was the only antibody capable of inducing ADCC on the five MCC lines tested. Because MCC tumors are often directly accessible, local pharmacologic manipulation to restore HLA class-I and ICAM-1 cell surface expression (and thus sensitivity to cell lysis) can potentially benefit immune therapeutic intervention. In line with this, our observation that ADCC against EpCAM can induce lysis of MCC lines and suggests that therapeutic targeting of this antigen deserves to be explored further.
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Abbreviations
- ADCC:
-
Antibody-dependent cellular cytotoxicity
- ATCC:
-
American-type culture collection
- CK:
-
Cytokeratin
- EpCAM:
-
Epithelial cell adhesion molecule
- FFPE:
-
Formalin-fixed, paraffin-embedded
- LFA-1:
-
Lymphocyte function-associated antigen 1
- LFB:
-
Laboratoire français du fractionnement et des biotechnologies
- MCC:
-
Merkel cell carcinoma
- MCPyV:
-
Merkel cell polyomavirus
- MIC:
-
MHC class-I polypeptide-related sequence
- NKG2D:
-
Natural killer group 2D
- RFI:
-
Relative fluorescence intensity
- TTF-1:
-
Thyroid transcription factor-1
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Acknowledgements
We thank the Cytometry Facility Cytocell from Nantes for expert technical assistance. We are also indebted to Drs. J. Becker and R. Houben (University Hospital Würzburg, Würzburg, Germany) for the MCC cell lines MKL-2, PeTa, and WaGa. We also thank Richard Breathnach for careful edition of the manuscript.
Funding
This work was supported by Cancéropole Grand Ouest (Project POCAME), and institutional Grant from Inserm.
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The study was conceived and coordinated by HV and BC. The manuscript was prepared by HV, BC, and JO. JO, TK, MS, HB, PA, and RV contributed to acquisition of data and interpretation of results. AT and NL provided intellectual contributions. All authors read and approved the manuscript.
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The authors declare that they have no conflict of interest. The study was approved by the Comité de Protection des Personnes TOURS, Région Centre-Ouest 1 (CPP n° 2009-S5). Peripheral blood mononuclear cells (PBMCs) were obtained from blood donors at the Etablissement Français du Sang (EFS) with informed consent (blood products transfer agreement relating to biomedical research protocol 97/5-B—DAF 03/4868).
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Ollier, J., Kervarrec, T., Samimi, M. et al. Merkel cell carcinoma and cellular cytotoxicity: sensitivity to cellular lysis and screening for potential target antigens suitable for antibody-dependent cellular cytotoxicity. Cancer Immunol Immunother 67, 1209–1219 (2018). https://doi.org/10.1007/s00262-018-2176-2
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DOI: https://doi.org/10.1007/s00262-018-2176-2