title: Autocrine induction of invasion and metastasis by tumor-associated trypsin inhibitor in human colon cancer cells.
abstract: From the conditioned medium of the human colon carcinoma cells, HT-29 5M21 (CM-5M21), expressing a spontaneous invasive phenotype, tumor-associated trypsin inhibitor (TATI) was identified and characterized by proteomics, cDNA microarray approaches and functional analyses. Both CM-5M21 and recombinant TATI, but not the K18Y-TATI mutant at the protease inhibitor site, trigger collagen type I invasion by several human adenoma and carcinoma cells of the colon and breast, through phosphoinositide-3-kinase, protein kinase C and Rho-GTPases/Rho kinase-dependent pathways. Conversely, the proinvasive action of TATI in parental HT29 cells was alleviated by the TATI antibody PSKAN2 and the K18Y-TATI mutant. Stable expression of K18Y-TATI in HT-29 5M21 cells downregulated tumor growth, angiogenesis and the expression of several metastasis-related genes, including CSPG4 (13.8-fold), BMP-7 (9.7-fold), the BMP antagonist CHORDIN (5.2-fold), IGFBP-2 and IGF2 (9.6- and 4.6-fold). Accordingly, ectopic expression of KY-TATI inhibited the development of lung metastases from HT-29 5M21 tumor xenografts in immunodeficient mice. These findings identify TATI as an autocrine transforming factor potentially involved in early and late events of colon cancer progression, including local invasion of the primary tumor and its metastatic spread. Targeting TATI, its molecular partners and effectors may bring novel therapeutic applications for high-grade human solid tumors in the digestive and urogenital systems.
authors.affiliation: Centre de Recherche Jean-Pierre Aubert, U837, Faculté de Médecine, Lille, France.
authors.forename: V
authors.initials: V
authors.lastname: Gouyer
authors.forename: D
authors.initials: D
authors.lastname: Fontaine
authors.forename: P
authors.initials: P
authors.lastname: Dumont
authors.forename: O
authors.initials: O
authors.lastname: de Wever
authors.forename: H
authors.initials: H
authors.lastname: Fontayne-Devaud
authors.forename: E
authors.initials: E
authors.lastname: Leteurtre
authors.forename: S
authors.initials: S
authors.lastname: Truant
authors.forename: D
authors.initials: D
authors.lastname: Delacour
authors.forename: H
authors.initials: H
authors.lastname: Drobecq
authors.forename: J-P
authors.initials: JP
authors.lastname: Kerckaert
authors.forename: Y
authors.initials: Y
authors.lastname: de Launoit
authors.forename: M
authors.initials: M
authors.lastname: Bracke
authors.forename: C
authors.initials: C
authors.lastname: Gespach
authors.forename: J-L
authors.initials: JL
authors.lastname: Desseyn
authors.forename: G
authors.initials: G
authors.lastname: Huet
mesh_terms: D000236:Adenoma / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D000818:Animals; D000912:Antibodies, Neoplasm / Q000494:pharmacology; D019898:Autocrine Communication / Q000187:drug effects; D001943:Breast Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D045744:Cell Line, Tumor; D003110:Colonic Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D006801:Humans; D008175:Lung Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology / Q000556:secondary; D051379:Mice; D016513:Mice, SCID; D009361:Neoplasm Invasiveness; D009362:Neoplasm Metastasis; D009363:Neoplasm Proteins / Q000235:genetics / Q000378:metabolism*; D009389:Neovascularization, Pathologic / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology; D014359:Trypsin Inhibitor, Kazal Pancreatic / Q000235:genetics / Q000378:metabolism* / Q000494:pharmacology
chemical_list: D000912:Antibodies, Neoplasm; D009363:Neoplasm Proteins; D011994:Recombinant Proteins; D014359:Trypsin Inhibitor, Kazal Pancreatic