PMID- 16049975 OWN - NLM STAT- MEDLINE DCOM- 20060111 LR - 20160303 IS - 0020-7136 (Print) IS - 0020-7136 (Linking) VI - 118 IP - 2 DP - 2006 Jan 15 TI - Exploitation of interleukin-18 by gastric cancers for their growth and evasion of host immunity. PG - 388-95 AB - Interleukin-18 (IL-18) is a pleiotropic cytokine that enhances Th1 or Th2 immune response. We show a novel mechanism of gastric cancer cells that allows their immune escape utilizing IL-18. All 4 gastric cancer cell lines, but not colon lines, constitutively expressed IL-18 receptors and IL-18 dose-dependently enhanced their in vitro proliferation accompanied by nuclear factor kappaB activation. When IL-18-pretreated gastric cancer cells were cultured with cytokine-activated peripheral blood killer lymphocytes, the antitumor machineries, perforin or interferon-gamma production of killer lymphocytes decreased, resulting in a decreased susceptibility of cancer cells to killer lymphocytes. Furthermore, gastric cancer cells cultured with IL-18 showed an increased expression of a granzyme B inhibitor, protease inhibitor 9. IL-18 injections into severe combined immuno-deficient mice intraperitoneally inoculated with gastric cancer cells consistently decreased the mouse survival time. Our results indicate that gastric cancers exploit IL-18 to grow/invade and evade immunosurveillance in the hosts. CI - Copyright 2005 Wiley-Liss, Inc. FAU - Majima, Takashi AU - Majima T AD - Department of Surgery I, National Defense Medical College, Tokorozawa, Japan. majima@ndmc.ac.jp FAU - Ichikura, Takashi AU - Ichikura T FAU - Chochi, Kentaro AU - Chochi K FAU - Kawabata, Toshinobu AU - Kawabata T FAU - Tsujimoto, Hironori AU - Tsujimoto H FAU - Sugasawa, Hidekazu AU - Sugasawa H FAU - Kuranaga, Noritsugu AU - Kuranaga N FAU - Takayama, Eiji AU - Takayama E FAU - Kinoshita, Manabu AU - Kinoshita M FAU - Hiraide, Hoshio AU - Hiraide H FAU - Seki, Shuhji AU - Seki S FAU - Mochizuki, Hidetaka AU - Mochizuki H LA - eng PT - Comparative Study PT - Journal Article PL - United States TA - Int J Cancer JT - International journal of cancer JID - 0042124 RN - 0 (Interleukin-18) RN - 0 (SERPINB9 protein, human) RN - 0 (Serpins) SB - IM MH - Animals MH - Cell Proliferation MH - Colonic Neoplasms/immunology MH - Disease Progression MH - Flow Cytometry MH - Gene Expression Profiling MH - Humans MH - Immunohistochemistry MH - Injections, Intraperitoneal MH - Interleukin-18/*immunology MH - Mice MH - Mice, SCID MH - Reverse Transcriptase Polymerase Chain Reaction MH - Serpins/biosynthesis MH - Stomach Neoplasms/*immunology/*pathology MH - Survival Analysis MH - Tumor Cells, Cultured MH - Tumor Escape/*immunology EDAT- 2005/07/29 09:00 MHDA- 2006/01/13 09:00 CRDT- 2005/07/29 09:00 PHST- 2005/07/29 09:00 [pubmed] PHST- 2006/01/13 09:00 [medline] PHST- 2005/07/29 09:00 [entrez] AID - 10.1002/ijc.21334 [doi] PST - ppublish SO - Int J Cancer. 2006 Jan 15;118(2):388-95. doi: 10.1002/ijc.21334.