title: Induction of antitumor immune response by homeostatic proliferation and CD28 signaling.
abstract: Inducing lymphopenia before adoptive cell transfer can improve the antitumor effect of donor immune cells. It was recently reported that lymphopenic conditions can initiate the differentiation of naive T cells into effector cells. Although T cells require a specific "strong" signal via TCR as well as costimulatory signals during Ag-driven differentiation, there has been little evidence to suggest any requirement for costimulatory signaling for the differentiation of naive T cells in a lymphopenic host. In this study, we demonstrate that naive CD8(+) T cells are indispensable for induction of antitumor effect, and, in addition to Ag-driven differentiation, CD28 signaling is essential for the differentiation of naive CD8(+) T cells into functional effector CTLs during homeostatic proliferation (HP). The systemic administration of IL-2 did not restore the antitumor effect induced by HP in the absence of CD28 signaling. These results suggest that homeostatic cytokines enable CD8(+) T cells to expand and survive, and that TCR and the CD28 signal initiate the differentiation of effector functions. A deeper understanding of the mechanisms underlying enhanced induction of the antitumor immune response with accompanying HP may allow us to more precisely induce enhanced immunity with costimulation signaling and the administration of common gamma-chain cytokines.
authors: Division of Immunobiology, Research Institute for Biological Science, Tokyo University of Science, Noda City, Japan.
authors: Toshihiro
authors: T
authors: Suzuki
authors: Shuhei
authors: S
authors: Ogawa
authors: Kazunari
authors: K
authors: Tanabe
authors: Hideaki
authors: H
authors: Tahara
authors: Ryo
authors: R
authors: Abe
authors: Hidehiro
authors: H
authors: Kishimoto
mesh_terms: D000818:Animals; D018106:CD28 Antigens / Q000276:immunology*; D018414:CD8-Positive T-Lymphocytes / Q000187:drug effects / Q000276:immunology; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D006706:Homeostasis / Q000276:immunology*; D006801:Humans; D018960:Hyaluronan Receptors / Q000276:immunology; D007113:Immunity, Innate / Q000276:immunology; D007156:Immunologic Memory / Q000276:immunology; D007376:Interleukin-2 / Q000494:pharmacology; D019041:L-Selectin / Q000276:immunology; D051379:Mice; D009369:Neoplasms / Q000276:immunology*; D010641:Phenotype; D015398:Signal Transduction / Q000276:immunology*; D023041:Xenograft Model Antitumor Assays
chemical_list: D018106:CD28 Antigens; D018960:Hyaluronan Receptors; D007376:Interleukin-2; D019041:L-Selectin