title: Protease expression in giant cell tumour of bone: a comparative study on feline and human samples.
abstract: Human giant cell tumour of bone (GCTB) is a rare low grade of malignancy tumour with tendency to recur. During tumourigenesis the bone remodeling balance is subverted by the tumour cellular components that interacting with bone matrix induce release of growth factors and cytokines, promoting cell proliferation and bone resorption. The master regulators of this positive feed-back are acid and neutral proteases that destroying extracellular matrix increase osteolysis. In contrast, in cats, very few data are reported on GCTB biological activity. In this study, histological features and metalloproteinase (MMPs) and urokinase plasminogen activator system (uPA) expression were compared in human and feline GCTB and differences in distribution and intensity related to histological pattern and clinical behaviour were determined. In both species, the overexpression of these molecules suggested a strong and complex cross-talk between tumour and microenvironment.
authors.affiliation: Department of Biopathological Sciences and Hygiene of Animal and Alimentary Productions, University of Perugia, Faculty of Veterinary Medicine, Via San Costanza, 4-06126 Perugia, Italy. leonardo.leonardi@unipg.it
authors.forename: Leonardo
authors.initials: L
authors.lastname: Leonardi
authors.forename: Irene
authors.initials: I
authors.lastname: Quattrini
authors.forename: Franco
authors.initials: F
authors.lastname: Roperto
authors.forename: Maria Serena
authors.initials: MS
authors.lastname: Benassi
mesh_terms: D000818:Animals; D002371:Cat Diseases / Q000201:enzymology* / Q000378:metabolism; D002415:Cats; D015971:Gene Expression Regulation, Enzymologic / Q000502:physiology*; D015972:Gene Expression Regulation, Neoplastic / Q000502:physiology*; D018212:Giant Cell Tumor of Bone / Q000201:enzymology / Q000235:genetics / Q000662:veterinary*; D006801:Humans; D010447:Peptide Hydrolases / Q000235:genetics / Q000378:metabolism*; D013045:Species Specificity
chemical_list: D010447:Peptide Hydrolases
keywords: Bone matrix; Cats; Giant cell tumour; Humans; Immunohistochemistry; Proteinases