Anti-PD-L1 Enhances NK Cell Activation

Example 5

This example provides a showing of an effect of anti-PD-L1 on NK cell activation. Disclosed anti-PD-L1 antibodies were assayed for their ability to promote the activation of lymphocytes. Peripheral blood mononuclear cells or purified populations of lymphocyte subsets isolated by cell sorting were cultured with IL-2 (100 U/ml) in the presence or absence of added anti-PD-L1 antibodies (10 μg/ml). After five days of culture, cells were stained for expression of CD25 as a measure of cell activation and analyzed by flow cytometry. The results shown in FIG. 5 reveal that H6 and H10 enhance cell activation and that the responsive lymphocyte population is the NK cell.