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Departments of Medicine [M. A. M.] and Surgery [H. K. L., E. G., S. K. N.] and Center for Genetic and Cellular Therapies [M. A. M., H. K. L., E. G., S. K. N.], Duke University Medical Center, Durham, North Carolina 27710; and Immunex Corporation, Seattle, Washington 98101 [E. T.]
Dendritic cells (DCs), matured by CD40-ligand (CD40L), undergo marked changes in their ability to process and present antigen, resulting in augmented lymphocyte stimulatory activity. We demonstrate that the form of the tumor antigen (peptide or genetic material) used to load the DCs dictates the required sequence of antigen loading and maturation for antitumor immunotherapy. Optimal stimulation of carcinoembryonic antigen (CEA)-specific CTLs by peptide-loaded DCs occurs when DCs from cancer patients are matured with CD40L before exposure to CEA peptide, whereas optimal stimulation by RNA-transfected DCs occurs when the DCs are loaded with CEA RNA before maturation with CD40L.
1 Supported in part by NIH Grant R01-CA64946.
2 To whom requests for reprints should be addressed, at Duke University Medical Center, Box 2606, MSRB Room 401, Durham, NC 27710.
Received 4/ 3/98. Accepted 6/ 1/98.
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