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*
Immunology Program, H. Lee Moffitt Cancer Center and Research Institute, and Department of Medical Microbiology and Immunology, University of South Florida College of Medicine, Tampa, FL 33612; and
Department of Human Oncology, University of Wisconsin Medical School, Madison, WI 53792
We assessed the effect of the stimulatory anti-CD40 Ab on
NK cell activation in vivo and the therapeutic potential of activated
NK cells in tumor-bearing mice. Single-dose i.p. injection of the
anti-CD40 Ab resulted in production of IL-12 and IFN-
in vivo,
followed by a dramatic increase in NK cell cytolytic activity in PBLs.
NK cell activation by anti-CD40 Ab was also observed in CD40 ligand
knockout mice. Because NK cells express CD40 ligand but not CD40, our
results suggest that NK activation is mediated by increased cytokine
production upon CD40 ligation of APCs. Treatment of tumor-bearing mice
with anti-CD40 Ab resulted in substantial antitumor and
antimetastatic effects in three tumor models. Depletion of NK cells
with anti-asialo GM1 Ab reduced or abrogated the observed antitumor
effects in all the tested models. These results indicate that a
stimulatory CD40 Ab indirectly activates NK cells, which can produce
significant antitumor and antimetastatic effects.
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