Erschienen in:
01.05.2011 | Original article
Adoptive immunotherapy combined with intratumoral TLR agonist delivery eradicates established melanoma in mice
verfasst von:
Sally M. Amos, Hollie J. Pegram, Jennifer A. Westwood, Liza B. John, Christel Devaud, Chris J. Clarke, Nicholas P. Restifo, Mark J. Smyth, Phillip K. Darcy, Michael H. Kershaw
Erschienen in:
Cancer Immunology, Immunotherapy
|
Ausgabe 5/2011
Einloggen, um Zugang zu erhalten
Abstract
Toll-like receptor (TLR) agonists can trigger broad inflammatory responses that elicit rapid innate immunity and promote the activities of lymphocytes, which can potentially enhance adoptive immunotherapy in the tumor-bearing setting. In the present study, we found that Polyinosinic:Polycytidylic Acid [Poly(I:C)] and CpG oligodeoxynucleotide 1826 [CpG], agonists for TLR 3 and 9, respectively, potently activated adoptively transferred T cells against a murine model of established melanoma. Intratumoral injection of Poly(I:C) and CpG, combined with systemic transfer of activated pmel-1 T cells, specific for gp10025–33, led to enhanced survival and eradication of 9-day established subcutaneous B16F10 melanomas in a proportion of mice. A series of survival studies in knockout mice supported a key mechanistic pathway, whereby TLR agonists acted via host cells to enhance IFN-γ production by adoptively transferred T cells. IFN-γ, in turn, enhanced the immunogenicity of the B16F10 melanoma line, leading to increased killing by adoptively transferred T cells. Thus, this combination approach counteracted tumor escape from immunotherapy via downregulation of immunogenicity. In conclusion, TLR agonists may represent advanced adjuvants within the setting of adoptive T-cell immunotherapy of cancer and hold promise as a safe means of enhancing this approach within the clinic.