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Department of Experimental Oncology, Istituto Nazionale per lo Studio e la Cura dei Tumori, Milan, Italy
Vaccinations with tumor cells engineered to produce IL-4 prolonged
survival and cured 30% of mice bearing pulmonary metastases, an effect
abrogated by in vivo depletion of T cells. Vaccination induced type 2 T
cell polarization in both CD4 and CD8 T lymphocyte subsets. We focused
on the antitumor activity exerted by type 2 CD8+ T cells
(Tc2) activated by IL-4 tumor cell vaccination. Tc2 lymphocytes lacked
in vitro tumor cytotoxicity, but released IL-4 upon stimulation with
tumor cells, as shown by limiting dilution analysis of the frequencies
of tumor-specific pCTL and of CD8 cells producing the cytokine. In vivo
fresh purified CD8+ T lymphocytes from IL-4-vaccinated mice
eliminated 80100% of lung metastases when transferred into
tumor-bearing mice. CD8+ lymphocytes from IL-4-vaccinated
IFN-
knockout (KO), but not from IL-4 KO, mice cured lung
metastases, thus indicating that IL-4 produced by Tc2 cells was
instrumental for tumor rejection. The antitumor effect of adoptively
transferred Tc2 lymphocytes needed host CD8 T cells and AsGM1 leukocyte
populations, and partially granulocytes. These data indicate that Tc2
CD8+ T cells exert immunoregulatory functions and induce
tumor rejection through the cooperation of bystander lymphoid effector
cells. Tumor eradication is thus not restricted to a type 1 response,
but can also be mediated by a type 2 biased T cell
response.
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