Long-term proliferation of functional human NK cells, with conversion of CD56(dim) NK cells to a CD56 (bright) phenotype, induced by carcinoma cells co-expressing 4-1BBL and IL-12.

Abstract excerpt

4-1BB ligation co-stimulates T cell activation, and agonistic antibodies have entered clinical trials. Natural killer (NK) cells also express 4-1BB following activation and are implicated in the anti-tumour efficacy of 4-1BB stimulation in mice; however, the response of human NK cells to 4-1BB stimulation is not clearly defined. Stimulation of non-adherent PBMC with OVCAR-3 cells expressing 4-1BB ligand (4-1BBL)...

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