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Tenovus Research Laboratory, Cancer Sciences Division, University School of Medicine, Southampton General Hospital, Southampton, United Kingdom
In this study we demonstrate that treatment with anti-CD40 mAb
eradicates a range of mouse lymphomas (BCL1, A31, A20, and
EL4), but only when used against i.v. tumor doses in excess of
107 cells. Only partial protection was seen against smaller
tumor loads. We saw no evidence that anti-CD40 mAb changed the
phenotype of the lymphomas or inhibited their growth in the initial
period following treatment, but it did result in a rapid expansion of
cytotoxic CD8+ cells that was able to clear the neoplastic
disease and provide long-term protection against tumor rechallenge. The
CTL responses were blocked by mAb against a range of coreceptors and
cytokines, including CD8, B7-1, B7-2, LFA-1, and IFN-
, but not CD4
or CTLA-4, indicating the presence of a conventional cellular Th1
response. Furthermore, we found evidence of cross-recognition between
lymphomas (BCL1 and A20) as measured by cytotoxicity and
IFN-
responses in vitro and using tumor rechallenge experiments,
suggesting common target Ags. Finally, although anti-CD40 was shown
to stimulate NK cell killing, we could find no role for these cells in
controlling tumor growth. These data underline the ability of
anti-CD40 mAb to potentiate CTL responses and the potency of
cellular immunity in eradicating large quantities of syngeneic
tumor.
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