title: Signal of proteinase-activated receptor-2 contributes to highly malignant potential of human pancreatic cancer by up-regulation of interleukin-8 release.
abstract: Proteinase-activated receptor-2 (PAR-2) is expressed in various tissues, including cancer lesions. However, the functional consequences of PAR-2 expression in cancer cells, especially in pancreatic cancer cells, are poorly understood. To clarify the biological significance of PAR-2 signaling in pancreatic cancer, we examined the production of growth factors and cytokines, such as IL-6, IL-8, bFGF, TGF-beta1, and VEGF, by specific ELISAs. Two human pancreatic cancer cell lines, SUIT2 and MiaPaCa2, which have been shown to express PAR-2, were stimulated by trypsin and PAR-2 activating peptide (PAR-2AP: SLIGKV-NH2). After 24 h, the culture supernatants were collected and specific ELISAs were performed. Although no significant changes were observed in the release of IL-6, bFGF, TGF-beta1, or VEGF, that of IL-8 was significantly up-regulated by PAR-2 agonists in a dose-dependent manner. In addition, IL-8 receptor expression was found in pancreatic cancer cells and fibroblasts. These results suggest that the PAR-2 signal up-regulates IL-8 release from pancreatic cancer cells. This up-regulated IL-8 has an effect on the pancreatic cancer cells in an autocrine manner and on the fibroblasts in a paracrine manner. Thus, this signal might contribute to tumor progression and characteristic fibrosis in pancreatic cancer.
authors.affiliation: Department of Gastroenterological Surgery, Postgraduate School of Medical Sciences, Kumamoto University, Kumamoto City 860-8556, Japan. ikecho@peace.ocn.ne.jp
authors.forename: Osamu
authors.initials: O
authors.lastname: Ikeda
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Egami
authors.forename: Takatoshi
authors.initials: T
authors.lastname: Ishiko
authors.forename: Shinji
authors.initials: S
authors.lastname: Ishikawa
authors.forename: Hidenobu
authors.initials: H
authors.lastname: Kamohara
authors.forename: Hideki
authors.initials: H
authors.lastname: Hidaka
authors.forename: Masahumi
authors.initials: M
authors.lastname: Takahashi
authors.forename: Michio
authors.initials: M
authors.lastname: Ogawa
mesh_terms: D000595:Amino Acid Sequence; D015153:Blotting, Western; D045744:Cell Line, Tumor; D004305:Dose-Response Relationship, Drug; D004797:Enzyme-Linked Immunosorbent Assay; D016222:Fibroblast Growth Factor 2 / Q000378:metabolism; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D006801:Humans; D007150:Immunohistochemistry; D015850:Interleukin-6 / Q000378:metabolism; D016209:Interleukin-8 / Q000378:metabolism*; D008954:Models, Biological; D009842:Oligopeptides / Q000494:pharmacology; D010190:Pancreatic Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D044464:Receptor, PAR-2 / Q000819:agonists / Q000235:genetics / Q000378:metabolism*; D023062:Receptors, Interleukin-8A / Q000235:genetics; D023063:Receptors, Interleukin-8B / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction; D016212:Transforming Growth Factor beta / Q000378:metabolism; D053773:Transforming Growth Factor beta1; D014357:Trypsin / Q000494:pharmacology; D015854:Up-Regulation / Q000187:drug effects; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism
chemical_list: D015850:Interleukin-6; D016209:Interleukin-8; D009842:Oligopeptides; D012333:RNA, Messenger; D044464:Receptor, PAR-2; D023062:Receptors, Interleukin-8A; D023063:Receptors, Interleukin-8B; C508960:TGFB1 protein, human; D016212:Transforming Growth Factor beta; D053773:Transforming Growth Factor beta1; D042461:Vascular Endothelial Growth Factor A; C109968:seryl-leucyl-isoleucyl--glycyl-lysyl-valine; D016222:Fibroblast Growth Factor 2; D014357:Trypsin