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Erschienen in: Cancer Immunology, Immunotherapy 6/2016

31.03.2016 | Original Article

Differential immunomodulatory activity of tumor cell death induced by cancer therapeutic toll-like receptor ligands

verfasst von: Johanna C. Klein, Clarissa A. Wild, Stephan Lang, Sven Brandau

Erschienen in: Cancer Immunology, Immunotherapy | Ausgabe 6/2016

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Abstract

Synthetic toll-like receptor (TLR) ligands stimulate defined immune cell subsets and are currently tested as novel immunotherapeutic agents against cancer with, however, varying clinical efficacy. Recent data showed the expression of TLR receptors also on tumor cells. In this study we investigated immunological events associated with the induction of tumor cell death by poly(I:C) and imiquimod. A human head and neck squamous cell carcinoma (HNSCC) cell line was exposed to poly(I:C) and imiquimod, which were delivered exogenously via culture medium or via electroporation. Cell death and cell biological consequences thereof were analyzed. For in vivo analyses, a human xenograft and a syngeneic immunocompetent mouse model were used. Poly(I:C) induced cell death only if delivered by electroporation into the cytosol. Cell death induced by poly(I:C) resulted in cytokine release and activation of monocytes in vitro. Monocytes activated by the supernatant of cancer cells previously exposed to poly(I:C) recruited significantly more Th1 cells than monocytes exposed to control supernatants. If delivered exogenously, imiquimod also induced tumor cell death and some release of interleukin-6, but cell death was not associated with release of Th1 cytokines, interferons, monocyte activation and Th1 recruitment. Interestingly, intratumoral injection of poly(I:C) triggered tumor cell death in tumor-bearing mice and reduced tumor growth independent of TLR signaling on host cells. Imiquimod did not affect tumor size. Our data suggest that common cancer therapeutic RNA compounds can induce functionally diverse types of cell death in tumor cells with implications for the use of TLR ligands in cancer immunotherapy.
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Metadaten
Titel
Differential immunomodulatory activity of tumor cell death induced by cancer therapeutic toll-like receptor ligands
verfasst von
Johanna C. Klein
Clarissa A. Wild
Stephan Lang
Sven Brandau
Publikationsdatum
31.03.2016
Verlag
Springer Berlin Heidelberg
Erschienen in
Cancer Immunology, Immunotherapy / Ausgabe 6/2016
Print ISSN: 0340-7004
Elektronische ISSN: 1432-0851
DOI
https://doi.org/10.1007/s00262-016-1828-3

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