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Inactivation of tumor‐specific CD8 + CTLs by tumor‐infiltrating tolerogenic dendritic cells
Author(s) -
Harimoto Hirotomo,
Shimizu Masumi,
Nakagawa Yohko,
Nakatsuka Katsuhisa,
Wakabayashi Ayako,
Sakamoto Choitsu,
Takahashi Hidemi
Publication year - 2013
Publication title -
immunology and cell biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.999
H-Index - 104
eISSN - 1440-1711
pISSN - 0818-9641
DOI - 10.1038/icb.2013.38
Subject(s) - cytotoxic t cell , major histocompatibility complex , cd8 , mhc class i , priming (agriculture) , biology , ctl* , immunosurveillance , microbiology and biotechnology , immunology , antigen , cancer research , immune system , in vitro , biochemistry , botany , germination
Cancer immunosurveillance failure is largely attributed to the insufficient activation of tumor‐specific class I major histocompatibility complex (MHC) molecule (MHC‐I)‐restricted CD8 + cytotoxic T lymphocytes (CTLs). DEC‐205 + dendritic cells (DCs), having the ability to cross‐present, can present captured tumor antigens on MHC‐I alongside costimulatory molecules, inducing the priming and activation of tumor‐specific CD8 + CTLs. It has been suggested that reduced levels of costimulatory molecules on DCs may be a cause of impaired CTL induction and that some tumors may induce the downregulation of costimulatory molecules on tolerogenic DCs. To examine such possibilities, we established two distinct types of murine hepatoma cell lines, named Hepa1‐6‐1 and Hepa1‐6‐2 (derived from Hepa1‐6 cells), and confirmed that they display similar antigenicities, as well as identical surface expression of MHC‐I. We found that Hepa1‐6‐1 had the ability to grow continuously after subcutaneous implantation into syngeneic C57BL/6 mice and did not prime CD8 + CTLs. In contrast, Hepa1‐6‐2 cells, which display reduced levels of adhesion molecules, such as Intercellular Adhesion Molecule 1 (ICAM‐1), failed to grow in vivo and efficiently primed CTLs. Moreover, Hepa1‐6‐1‐derived factors, such as transforming growth factor (TGF)‐β1, vascular endothelial growth factor (VEGF) and α‐fetoprotein (AFP), converted CD11c high MHC‐II high DEC‐205 + DC subsets into tolerogenic cells, displaying downregulated costimulatory molecules and having impaired cross‐presenting capacities. These immunosuppressive tolerogenic DCs appeared to inhibit the induction of tumor‐specific CD8 + CTLs and suppress their cytotoxic functions within the tumor. Together, the findings presented here provide a new method of cancer immunotherapy using the selective suppression, depletion or alteration of immunosuppressive tolerogenic DCs within tumors.