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Comparative Study
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.
Differences in dendritic cells stimulated in vivo by tumors engineered to secrete granulocyte-macrophage colony-stimulating factor or Flt3-ligand.
Cancer Research 2000 June 16
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.
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