title: Differences in dendritic cells stimulated in vivo by tumors engineered to secrete granulocyte-macrophage colony-stimulating factor or Flt3-ligand.
abstract: Both granulocyte-macrophage colony-stimulating factor (GM-CSF) and flt3-ligand (FL) induce the development of dendritic cells (DCs). To compare the functional properties of DCs stimulated by these cytokines in vivo, we used retroviral-mediated gene transfer to generate murine tumor cells secreting high levels of each molecule. Injection of tumor cells expressing either GM-CSF or FL resulted in the dramatic increase of CD11c+ cells in the spleen and tumor infiltrate. However, vaccination with irradiated, GM-CSF-secreting tumor cells stimulated more potent antitumor immunity than vaccination with irradiated, FL-secreting tumor cells. The superior antitumor immunity elicited by GM-CSF involved a broad T cell cytokine response, in contrast to the limited Thl response elicited by FL. DCs generated by GM-CSF were CD8alpha- and expressed higher levels of B7-1 and CD1d than DCs cells generated by FL. Injection sites of metastatic melanoma patients vaccinated with irradiated, autologous tumor cells engineered to secrete GM-CSF demonstrated similar, dense infiltrates of DCs expressing high levels of B7-1. These findings reveal critical differences in the abilities of GM-CSF and FL to enhance the function of DCs in vivo and have important implications for the crafting of tumor vaccines.
authors.affiliation: Department of Adult Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA.
authors.forename: N
authors.initials: N
authors.lastname: Mach
authors.forename: S
authors.initials: S
authors.lastname: Gillessen
authors.forename: S B
authors.initials: SB
authors.lastname: Wilson
authors.forename: C
authors.initials: C
authors.lastname: Sheehan
authors.forename: M
authors.initials: M
authors.lastname: Mihm
authors.forename: G
authors.initials: G
authors.lastname: Dranoff
mesh_terms: D000276:Adjuvants, Immunologic / Q000378:metabolism*; D000818:Animals; D018949:Antigens, CD1 / Q000378:metabolism; D055610:Antigens, CD1d; D016827:CD8 Antigens / Q000378:metabolism; D019496:Cancer Vaccines; D003713:Dendritic Cells / Q000276:immunology* / Q000378:metabolism; D005260:Female; D005434:Flow Cytometry; D018014:Gene Transfer Techniques; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000378:metabolism*; D006801:Humans; D016167:Integrin alphaXbeta2 / Q000378:metabolism; D015848:Interleukin-5 / Q000378:metabolism; D008545:Melanoma / Q000276:immunology / Q000628:therapy; D008546:Melanoma, Experimental / Q000276:immunology / Q000628:therapy; D008565:Membrane Proteins / Q000378:metabolism*; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D012190:Retroviridae / Q000235:genetics; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology; D018417:Th1 Cells / Q000276:immunology; D013997:Time Factors; D014407:Tumor Cells, Cultured
chemical_list: D000276:Adjuvants, Immunologic; D018949:Antigens, CD1; D055610:Antigens, CD1d; C526877:CD1D protein, human; D016827:CD8 Antigens; D019496:Cancer Vaccines; D016167:Integrin alphaXbeta2; D015848:Interleukin-5; D008565:Membrane Proteins; C084881:flt3 ligand protein; D016178:Granulocyte-Macrophage Colony-Stimulating Factor