Abstract
Background
Cetuximab is an anti-epidermal growth factor receptor (EGFR) monoclonal antibody that prolongs survival in the treatment for head and neck cancer (HNC), but only in 10–20 % of patients. An immunological mechanism of action such as natural killer (NK) cell–mediated antibody-dependent cellular cytotoxicity (ADCC) has been suggested. We investigated the effects of activating toll-like receptor (TLR)-8 to enhance activity of cetuximab-stimulated, FcγR-bearing cells.
Objective
To determine the capability of TLR8-stimulation to enhance the activation and function of NK cells and dendritic cells (DC) in the presence of cetuximab-coated HNC cells.
Methods
Peripheral blood mononuclear cells (PBMC), NK, DC, and CD8+ T cells were isolated and analyzed using 51Cr release ADCC, flow cytometry analysis, cytokine ELISA, and EGFR853-861 tetramer staining.
Results
TLR8 stimulation of unfractionated PBMC led to enhanced cetuximab-mediated ADCC in healthy donors (p < 0.01) and HNC patients (p < 0.001), which was dependent on NK cells. Secretion of Th1 cytokines TNFα (p < 0.0001), IFNγ (p < 0.0001), and IL-12p40 (p < 0.005) was increased. TLR8 stimulation of PBMC augmented cetuximab-enhanced NK cell degranulation (p < 0.001). TLR8-stimulated NK cells enhanced DC maturation markers CD80, CD83, and CD86 in co-culture with cetuximab-treated HNC cells. TLR8 stimulation of NK-DC co-cultures significantly increased DC priming of EGFR-specific CD8+ T cells in the presence of cetuximab.
Discussion
VTX-2337 and cetuximab combination therapy can activate innate and adaptive anti-cancer immune responses. Further investigation in human trials will be important for determining the clinical benefit of this combination and for determining biomarkers of response.
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Acknowledgments
Robert L. Ferris: R01 DE19727, P50 CA097190, P30 CA047904. Ryan M. Stephenson: Doris Duke Charitable Foundation Clinical Research Fellow.
Conflict of interest
Maura Matthews, Gregory Dietsch, and Robert Hershberg are employees of VentiRx® Pharmaceuticals. Other authors have no conflicts to disclose.
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Ryan M. Stephenson and Chwee Ming Lim contributed equally to this work.
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Stephenson, R.M., Lim, C.M., Matthews, M. et al. TLR8 stimulation enhances cetuximab-mediated natural killer cell lysis of head and neck cancer cells and dendritic cell cross-priming of EGFR-specific CD8+ T cells. Cancer Immunol Immunother 62, 1347–1357 (2013). https://doi.org/10.1007/s00262-013-1437-3
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DOI: https://doi.org/10.1007/s00262-013-1437-3