title: Matrix metalloproteinase-9 contributes to intestinal tumourigenesis in the adenomatous polyposis coli multiple intestinal neoplasia mouse.
abstract: Matrix metalloproteinases (MMPs) are a family of 23 extracellular proteases that are best known for their collective ability to degrade all components of the extracellular matrix. We previously demonstrated that genetic ablation of MMP-7 reduced tumour multiplicity in multiple intestinal neoplasia (Min) mice possessing a genetic alteration in the adenomatous polyposis coli gene (APC). These mice, commonly referred to as APC-Min mice, are a frequently used model of early intestinal tumourigenesis. To examine further the role of MMPs in intestinal tumour development, we generated APC-Min mice genetically deficient in MMP-2, -9, -12 or -19. Genetic ablation of MMP-2, -12 or -19 did not affect multiplicity or size of intestinal tumours when crossed into the APC-Min system. However, MMP-9 deficient animals developed 40% fewer tumours than littermate controls, although tumour size distribution remained unaffected. Intestinal adenomas from MMP-9 deficient mice demonstrated a 50% decrease in proliferating cells compared with control tissues, with no difference in apoptosis. To determine the cellular origin of MMP-9 in these tumours, immunofluorescent co-staining with markers for different leucocyte lineages was used to demonstrate that intratumoural MMP-9 is largely a product of neutrophils. These studies extend the potential targets for chemoprevention of intestinal adenomas to MMP-9 in addition to MMP-7 and exclude MMP-2,-12,-19 as attractive targets for intervention.
authors.affiliation: Department of Cancer Biology, Vanderbilt University, Nashville, TN 37232-6840, USA.
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Sinnamon
authors.forename: Kathy J
authors.initials: KJ
authors.lastname: Carter
authors.forename: Barbara
authors.initials: B
authors.lastname: Fingleton
authors.forename: Lynn M
authors.initials: LM
authors.lastname: Matrisian
mesh_terms: D011125:Adenomatous Polyposis Coli / Q000201:enzymology* / Q000473:pathology; D000818:Animals; D001947:Breeding; D003110:Colonic Neoplasms / Q000201:enzymology* / Q000473:pathology; D017491:Genes, APC; D007150:Immunohistochemistry; D007413:Intestinal Mucosa / Q000201:enzymology*; D053508:Matrix Metalloproteinase 12 / Q000032:analysis; D020778:Matrix Metalloproteinase 2 / Q000032:analysis / Q000235:genetics; D020780:Matrix Metalloproteinase 9 / Q000032:analysis* / Q000235:genetics / Q000378:metabolism; D053505:Matrix Metalloproteinases, Secreted / Q000032:analysis; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008856:Microscopy, Fluorescence; D009504:Neutrophils / Q000201:enzymology
chemical_list: D053505:Matrix Metalloproteinases, Secreted; C108362:matrix metalloproteinase 19; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9; D053508:Matrix Metalloproteinase 12