title: Simultaneous targeting of CD3 on T cells and CD40 on B or dendritic cells augments the antitumor reactivity of tumor-primed lymph node cells.
abstract: To date, molecular targets chosen for Ab activation to generate antitumor effector cells have been confined on T cells, such as TCR/CD3, CD28, CD137 (4-1BB), CD134 (OX40), and inducible costimulator. In this report we investigated the immune function of murine tumor-draining lymph node (TDLN) cells after simultaneous Ab targeting of CD3 on T cells and CD40 on APCs. Anti-CD3 plus anti-CD40-activated TDLN cells secreted significantly higher amounts of IFN-gamma, but less IL-10, compared with anti-CD3-activated cells. In adoptive immunotherapy, ligation of CD3 and CD40 resulted in the generation of more potent effector cells in mediating tumor regression. Freshly harvested TDLN cells were composed of approximately 60% CD3+ T cells, 30-35% CD19+ B cells, 5% CD11c+ dendritic cells (DC), and few CD14+ or NK cells (each <3%). CD40 was distributed predominantly on B cells and DCs. Cell depletion indicated that simultaneous targeting was toward CD3 on T cells and CD40 on APCs, respectively. Elimination of APCs completely abrogated the augmented antitumor responses induced by anti-CD40. Either B cell or DC removal partially, but significantly, reduced the therapeutic efficacy conferred by CD40 engagement. Furthermore, the immunomodulation function of anti-CD40 was associated with its capability to increase IL-12 secretion while inhibiting IL-4 production. Our study establishes a role for CD40 expressed on B cells or DCs in the costimulation of TDLN cells. Eliciting antitumor activity via simultaneous targeting of CD3 on T cells and CD40 on APCs is relevant for the design of effective T cell-based cancer immunotherapy.
authors: Department of Surgery, University of Michigan Medical Center, Ann Arbor, MI 48109-0666, USA. qiaoli@umich.edu
authors: Qiao
authors: Q
authors: Li
authors: Amelia C
authors: AC
authors: Grover
authors: Elizabeth J
authors: EJ
authors: Donald
authors: Abbey
authors: A
authors: Carr
authors: Jiyun
authors: J
authors: Yu
authors: Joel
authors: J
authors: Whitfield
authors: Mark
authors: M
authors: Nelson
authors: Nobuhiro
authors: N
authors: Takeshita
authors: Alfred E
authors: AE
authors: Chang
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000378:metabolism / Q000627:therapeutic use; D000938:Antigen-Presenting Cells / Q000276:immunology / Q000378:metabolism; D018941:Antigens, CD19 / Q000096:biosynthesis; D001402:B-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D039521:CD11c Antigen / Q000096:biosynthesis; D017252:CD3 Complex / Q000276:immunology / Q000378:metabolism*; D019013:CD40 Antigens / Q000096:biosynthesis / Q000276:immunology / Q000378:metabolism*; D023201:CD40 Ligand / Q000276:immunology / Q000378:metabolism; D045744:Cell Line, Tumor; D003713:Dendritic Cells / Q000276:immunology* / Q000378:metabolism; D005260:Female; D005354:Fibrosarcoma / Q000276:immunology / Q000517:prevention & control*; D016219:Immunotherapy, Adoptive / Q000379:methods; D007371:Interferon-gamma / Q000378:metabolism; D018664:Interleukin-12 / Q000096:biosynthesis; D015847:Interleukin-4 / Q000037:antagonists & inhibitors / Q000378:metabolism; D008198:Lymph Nodes / Q000276:immunology* / Q000378:metabolism / Q000473:pathology* / Q000637:transplantation; D008213:Lymphocyte Activation / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009368:Neoplasm Transplantation; D013601:T-Lymphocytes / Q000276:immunology / Q000378:metabolism*
chemical_list: D000911:Antibodies, Monoclonal; D018941:Antigens, CD19; D039521:CD11c Antigen; D017252:CD3 Complex; D019013:CD40 Antigens; D023201:CD40 Ligand; D018664:Interleukin-12; D015847:Interleukin-4; D007371:Interferon-gamma