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*
Laboratory of Experimental Immunology, Center for Cancer Research, National Cancer Institute, and
Intramural Research Support Program, Science Applications International Corporation, Frederick, MD 21702; and
Cancer Immunology, Peter MacCallum Cancer Institute, East Melbourne, Victoria, Australia
Kidney cancer is a devastating disease; however, biological
therapies have achieved some limited success. The murine renal cancer
Renca has been used as a model for developing new preclinical
approaches to the treatment of renal cell carcinoma. Successful
cytokine-based approaches require CD8+ T cells, but the
exact mechanisms by which T cells mediate therapeutic benefit have not
been completely identified. After successful biological therapy of
Renca in BALB/c mice, we generated CTLs in vitro using mixed lymphocyte
tumor cultures. These CTL mediated tumor-specific
H-2Kd-restricted lysis and production of IFN-
, TNF-
,
and Fas ligand (FasL) in response to Renca. CTL used both granule- and
FasL-mediated mechanisms to lyse Renca, although granule-mediated
killing was the predominant lytic mechanism in vitro. The cytokines
IFN-
and TNF-
increased the sensitivity of Renca cells to CTL
lysis by both granule- and FasL-mediated death pathways. Adoptive
transfer of these anti-Renca CTL into tumor-bearing mice cured most
mice of established experimental pulmonary metastases, and successfully
treated mice were immune to tumor rechallenge. Interestingly, we were
able to establish Renca-specific CTL from mice gene targeted for
perforin (pfp-/-) mice. Although these
pfp-/- CTL showed reduced cytotoxic activity against
Renca, their IFN-
production in the presence of Renca targets was
equivalent to that of wild-type CTL, and adoptive transfer of
pfp-/- CTL was as efficient as wild-type CTL in causing
regression of established Renca pulmonary metastases. Therefore,
although granule-mediated killing is of paramount importance for
CTL-mediated lysis in vitro, some major in vivo effector mechanisms
clearly are independent of perforin.
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