title: Clinico-pathological features and somatic gene alterations in refractory ceramic fibre-induced murine mesothelioma reveal mineral fibre-induced mesothelioma identities.
abstract: Although human malignant mesothelioma (HMM) is mainly caused by asbestos exposure, refractory ceramic fibres (RCFs) have been classified as possibly carcinogenic to humans on the basis of their biological effects in rodents' lung and pleura and in cultured cells. Hence, further investigations are needed to clarify the mechanism of fibre-induced carcinogenicity and to prevent use of harmful particles. In a previous study, mesotheliomas were found in hemizygous Nf2 (Nf2(+/-)) mice exposed to asbestos fibres, and showed similar alterations in genes at the Ink4 locus and in Trp53 as described in HMM. Here we found that Nf2(+/-) mice developed mesotheliomas after intra-peritoneal inoculation of a RCF sample (RCF1). Clinical features in exposed mice were similar to those observed in HMM, showing association between ascite and mesothelioma. Early passages of 12 mesothelioma cell cultures from ascites developed in RCF1-exposed Nf2(+/-) mice demonstrated frequent inactivation by deletion of genes at the Ink4 locus, and low rate of Trp53 point and insertion mutations. Nf2 gene was inactivated in all cultures. In most cases, co-inactivation of genes at the Ink4 locus and Nf2 was found and, at a lower rate, of Trp53 and Nf2. These results are the first to identify mutations in RCF-induced mesothelioma. They suggest that nf2 mutation is complementary of p15(Ink4b), p16(Ink4a) and p19(Arf) or p53 mutations and show similar profile of gene alterations resulting from exposure to ceramic or asbestos fibres in Nf2(+/-) mice, also consistent with the one found in HMM. These somatic genetic changes define different pathways of mesothelial cell transformation.
authors.affiliation: INSERM, U841, IMRB, Créteil, F-94000, France.
authors.forename: Pascal
authors.initials: P
authors.lastname: Andujar
authors.forename: Céline
authors.initials: C
authors.lastname: Lecomte
authors.forename: Annie
authors.initials: A
authors.lastname: Renier
authors.forename: Jocelyne
authors.initials: J
authors.lastname: Fleury-Feith
authors.forename: Laurence
authors.initials: L
authors.lastname: Kheuang
authors.forename: Julien
authors.initials: J
authors.lastname: Daubriac
authors.forename: Anne
authors.initials: A
authors.lastname: Janin
authors.forename: Marie-Claude
authors.initials: MC
authors.lastname: Jaurand
mesh_terms: D000818:Animals; D001201:Ascites / Q000473:pathology; D002478:Cells, Cultured; D002516:Ceramics / Q000633:toxicity*; D050756:Cyclin-Dependent Kinase Inhibitor Proteins / Q000378:metabolism; D019941:Cyclin-Dependent Kinase Inhibitor p16 / Q000378:metabolism; D004195:Disease Models, Animal; D008654:Mesothelioma / Q000139:chemically induced / Q000378:metabolism* / Q000473:pathology; D051379:Mice; D018345:Mice, Knockout; D019016:Mineral Fibers / Q000633:toxicity; D025581:Neurofibromin 2 / Q000235:genetics / Q000378:metabolism*; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism
chemical_list: C417743:Cdkn2a protein, mouse; D050756:Cyclin-Dependent Kinase Inhibitor Proteins; D019941:Cyclin-Dependent Kinase Inhibitor p16; D019016:Mineral Fibers; D025581:Neurofibromin 2; D016159:Tumor Suppressor Protein p53