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Departments of
* Cancer Biology,
Biometrics, and
Hybridoma, Immunex Research and Development, Seattle, WA 98101
4-1BB (CD137) is a member of the TNFR superfamily (TNFRSF9). T cell
expression of 4-1BB is restricted to activated cells, and cross-linking
has been shown to deliver a costimulatory signal. Here we have shown
that treatment of tumor-bearing mice with agonistic 4-1BB-specific Abs
can lead to T cell-mediated tumor rejection. In vivo mAb depletion
experiments demonstrated that this rejection requires CD8+
cells but not CD4+ or NK cells. Both IFN-
- and
CD40-mediated signals were also required, because no benefit was
observed on treatment with 4-1BB mAb in mice in which the genes for
these molecules had been knocked out. Interestingly, 4-1BB-mediated
stimulation of immune responses in CD40L-/- mice is
effective (although at a reduced level), and may suggest the existence
of an alternative ligand for CD40. Additional experiments in
IL-15-/- mice indicate that IL-15 is not required for
either the generation of the primary tumor-specific immune response or
the maintenance of the memory immune response. In contrast, the
presence of CD4 cells during the primary immune response appears to
play a significant role in the maintenance of effective antitumor
memory. Finally, in mice in which the number of dendritic cells had
been expanded by Fms-like tyrosine kinase3 ligand treatment, the
antitumor effects of 4-1BB ligation were
enhanced.
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