title: Overexpression of IL-1ra gene up-regulates interleukin-1beta converting enzyme (ICE) gene expression: possible mechanism underlying IL-1beta-resistance of cancer cells.
abstract: We investigated the interaction of endogenous interleukin (IL)-1beta, IL-1ra, and interleukin-1beta converting enzyme (ICE) in four human urological cancer cell lines, KU-19-19, KU-1, KU-2 and KU-19-20. Northern blot analysis showed that IL-1beta gene was expressed in all cell lines. On the other hand, in KU-19-19 and KU-19-20, the gene expressions of both IL-1ra and ICE were suppressed. MTT assay revealed that IL-1beta (10 ng ml(-1)) promoted cell growth in KU-19-19 and KU-19-20, while it inhibited in KU-1 and KU-2. An ICE inhibitor, Acetyl-Tyr-Val-Ala-Asp-CHO (YVAD-CHO) blocked IL-1beta-induced growth inhibition in KU-1 and KU-2. Overexpression of the secretory type IL-1ra with adenovirus vector (AxlL-1ra) enhanced ICE gene expression, while exogenous IL-1ra (100 ng ml(-1)) did not enhance it. Furthermore, AxIL-1ra treatment promoted endogenous IL-1beta secretion and induced significant growth inhibition and apoptotic cell death on KU-19-19 and KU-19-20. Treatment with either IL-1ra (100 ng ml(-1)), IL-1beta antibody (100 microg ml(-1)), or YVAD-CHO blocked AxlL-1ra-induced cell death in KU-19-19 and KU-19-20. These results suggest that IL-1beta-sensitivity depends on the level of ICE gene expression, which is regulated by the level of endogenous slL-1ra expression. This is a first report on the intracellular function of slL-1ra and these findings may provide key insights into the mechanism underlying the viability of cancer cells.
authors.affiliation: Department of Urology, School of Medicine, Keio University, Tokyo, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Sumitomo
authors.forename: M
authors.initials: M
authors.lastname: Tachibana
authors.forename: M
authors.initials: M
authors.lastname: Murai
authors.forename: M
authors.initials: M
authors.lastname: Hayakawa
authors.forename: H
authors.initials: H
authors.lastname: Nakamura
authors.forename: A
authors.initials: A
authors.lastname: Takayanagi
authors.forename: N
authors.initials: N
authors.lastname: Shimizu
mesh_terms: D017209:Apoptosis / Q000502:physiology*; D015152:Blotting, Northern; D015153:Blotting, Western; D020170:Caspase 1 / Q000235:genetics*; D002455:Cell Division; D004247:DNA / Q000032:analysis; D004797:Enzyme-Linked Immunosorbent Assay; D015870:Gene Expression; D005786:Gene Expression Regulation; D005822:Genetic Vectors; D006801:Humans; D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1 / Q000502:physiology*; D012795:Sialoglycoproteins / Q000235:genetics*; D014162:Transfection; D014407:Tumor Cells, Cultured; D015854:Up-Regulation
chemical_list: C507763:IL1RN protein, human; D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1; D012795:Sialoglycoproteins; D004247:DNA; D020170:Caspase 1