title: Mast cell tryptase stimulates DLD-1 carcinoma through prostaglandin- and MAP kinase-dependent manners.
abstract: We found that striptease-positive mast cells were abundant in the invasive front of human colon adenocarcinoma by examining 30 cases. Because tryptase has been suggested to be the agonist proteinase for protease-activated receptor-2 (PAR-2), we investigated the effects of stimulation of PAR-2 by tryptase on the cell signaling and proliferation of DLD-1, a human colon carcinoma cell line. PAR-2 stimulation by tryptase induced the increase in [Ca(2+)](i), which was desensitized by the prior application of PAR-2 activating peptide (AP). The proliferative responses of DLD-1 to tryptase and PAR-2 AP were associated with the phosphorylation of MEK and MAP kinase. Inhibition of MEK by PD98059 completely inhibited the proliferation-enhancing effects of tryptase and PAR-2 AP as well as phosphorylation of MAP kinase. Moreover, tryptase and PAR-2 AP stimulated the production of prostaglandin E2 and the inhibition of prostaglandin synthesis by indomethacin or NS398 resulted in the complete inhibition of the proliferative responses to tryptase and PAR-2 AP. Furthermore, the tryptase-stimulated proliferation of DLD-1 was concentration-dependently inhibited by nafamostat mesilate, a specific inhibitor of tryptase. These results as a whole indicated that tryptase has proliferative effects on DLD-1 through cyclooxygenase- and MAP kinase-dependent manners acting on PAR-2 by its proteolytic activity.
authors.affiliation: Department of Gastroenterological Surgery, Transplant, and Surgical Oncology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan.
authors.forename: Masanori
authors.initials: M
authors.lastname: Yoshii
authors.forename: Atsushi
authors.initials: A
authors.lastname: Jikuhara
authors.forename: Shuji
authors.initials: S
authors.lastname: Mori
authors.forename: Hiromi
authors.initials: H
authors.lastname: Iwagaki
authors.forename: Hideo K
authors.initials: HK
authors.lastname: Takahashi
authors.forename: Masahiro
authors.initials: M
authors.lastname: Nishibori
authors.forename: Noriaki
authors.initials: N
authors.lastname: Tanaka
mesh_terms: D001550:Benzamidines; D002118:Calcium / Q000032:analysis / Q000378:metabolism; D002277:Carcinoma / Q000473:pathology; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D003110:Colonic Neoplasms / Q000378:metabolism* / Q000473:pathology; D016861:Cyclooxygenase Inhibitors / Q000494:pharmacology; D003600:Cytosol / Q000378:metabolism; D015232:Dinoprostone / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005419:Flavonoids / Q000494:pharmacology; D006146:Guanidines / Q000494:pharmacology; D006801:Humans; D007150:Immunohistochemistry; D007213:Indomethacin / Q000494:pharmacology; D008407:Mast Cells / Q000201:enzymology*; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism*; D009578:Nitrobenzenes / Q000494:pharmacology; D010766:Phosphorylation / Q000187:drug effects; D011453:Prostaglandins / Q000378:metabolism*; D044464:Receptor, PAR-2 / Q000819:agonists / Q000378:metabolism; D012697:Serine Endopeptidases / Q000494:pharmacology*; D013449:Sulfonamides / Q000494:pharmacology; D053802:Tryptases
chemical_list: D001550:Benzamidines; D016861:Cyclooxygenase Inhibitors; D004791:Enzyme Inhibitors; D005419:Flavonoids; D006146:Guanidines; D009578:Nitrobenzenes; D011453:Prostaglandins; D044464:Receptor, PAR-2; D013449:Sulfonamides; C080955:N-(2-cyclohexyloxy-4-nitrophenyl)methanesulfonamide; D048052:Mitogen-Activated Protein Kinase 3; D020928:Mitogen-Activated Protein Kinases; D012697:Serine Endopeptidases; D053802:Tryptases; D015232:Dinoprostone; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one; D002118:Calcium; D007213:Indomethacin; C032855:nafamostat