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Objective:To explore the expression of B7-1,B7-2 and B7-H1 on tumor-infiltrating dendritic cells(TIDC) and on splenic dendritic cells(SDC),and to investigate TIDC-mediated and SDC-mediated T-cell function after blocking B7-H1 expression in these dendritic cells.Methods: The TIDCs and SDCs were isolated from tumor-bearing mice using anti-mouse CD11c magnetic beads.The expression of B7-1,B7-2 and B7-H1 on TIDC and SDC was analyzed using flow cytometer.T cells were co-cultured with TIDCs or SDCs for the mixed lymphocyte reaction(MLR),and monoclonal antibodies to B7-H1 or the isotype control antibodies were added to the MLR cultures.T-cell proliferation was assessed using XTT method and the secretion of IL-10 was detected using ELISA.Results: B7-1 and B7-2 positive TIDCs were significantly less than SDCs(P0.05).T-cell proliferation stimulated by TIDCs was weaker than that stimulated by SDCs;T cells produced more IL-10 after TIDCs stimulation than after SDCs stimulation(P
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Objective To study on the morphological characterizations of tumor infiltrating dendritic cells(TIDCs) in human rectum cancer. Methods The distributive and morphological changes of TIDCs were observed by light,electron microscopy and examined with immunohisochemistoy. Results TIDCs mainly appeared in the tumor-surrounding tissues.There were more TIDCs in the earlier stage than in the later stage(P