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* Departments of Molecular Genetics and Biochemistry and
Surgery, University of Pittsburgh, PA 15219; and
Department of Musculoskeletal Diseases, GlaxoSmithKline Pharmaceuticals, King of Prussia, PA 19406
Recently, several novel members of the IL-1 family have been
identified. The possible therapeutic utility and the underlying
biologic role of these new members remain unclear. In the present study
we analyzed the anti-tumor activity of human IL-1 homologue
4(IL-1H4; renamed IL-F7) by adenovirus-mediated gene transfer
(AdIL-1H4) directly into murine tumors. In vitro expression analysis
showed that IL-1H4 was a secretory protein. Treatment of an established
MCA205 mouse fibrosarcoma by single intratumoral injection of AdIL-1H4
resulted in significant growth suppression. Furthermore, complete
inhibition of tumor growth was observed following multiple injections
of AdIL-1H4. The anti-tumor activity of IL-1H4 was abrogated in
nude and SCID mice and in IL-12-, IFN-
-, or Fas ligand-deficient
mice. In contrast, IL-1H4 was able to confer substantial anti-tumor
effects in NKT-deficient mice. These results suggest that IL-1H4 could
play an important role in the link between innate and adaptive immunity
and may be useful for tumor immunotherapy.
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