Induction of anti-tumor immunity by mouse tumor cells transfected with mouse interleukin-12 gene - PubMed (original) (raw)
Induction of anti-tumor immunity by mouse tumor cells transfected with mouse interleukin-12 gene
S Obana et al. Jpn J Med Sci Biol. 1995 Oct-Dec.
Abstract
Interleukin-12 (IL-12) is a heterodimeric cytokine. In order to transduce both cDNAs for p35 and p40 of IL-12 in the tumor cells, a polycistronic retroviral vector was constructed by inserting the internal ribosome entry site gene of encephalomyocarditis virus between two cDNAs. On the other hand, two cDNAs were sequentially transfected in the tumor cells. Both polycistronic gene transfectants and double transfectants produced biologically active mouse IL-12. IL-12-expressing tumor cells were all rejected in syngeneic mice, and induced cytotoxic T lymphocyte activity. The capacity to induce anti-tumor memory may depend on the amount of IL-12 produced by the transfectants, because the relatively higher IL-12 producer tumor cell line induced the anti-tumor memory in the rejected mice, but the lower producer did not.
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