title: Cloning and identification of genes differentially expressed in metastatic and non-metastatic rat rhabdomyosarcoma cell lines.
abstract: The objective of this study was to identify genes involved in invasion and metastasis using a rat rhabdomyosarcoma model (SMF-A and RMS-B cell lines). The SMF-A cell line was established from a metastatic nodule of an induced rhabdomyosarcoma in syngeneic F344 rats. Two cell lines with defined metastatic potentials, SMF-Ai and SMF-Da, were cloned from the SMF-A line. The cell line SMF-Ai is tumorigenic, highly invasive and highly metastatic. On the other hand, the revertant line SMF-Da is less tumorigenic, non-invasive and non-metastatic. We have isolated from a SMF-Ai cDNA library eight cDNA clones which are differentially expressed by the metastatic SMF-Ai and the non-metastatic SMF-Da cell line using Northern blot analysis. Five of these clones, smf-4, smf-6, smf-41, smf-42 and smf-44, are overexpressed in the SMF-Da cell line and have homology with beta-2-microglobulin, lactate dehydrogenase, ribosomal protein L38, ribosomal protein S4 and acidic ribosomal phosphoprotein P1, respectively. The three other clones, smf-7, smf-40 and smf-61, are overexpressed in SMF-Ai. Clones smf-40 and smf-61 show significant homology with the human TB3-1 gene and the human fus gene respectively. The clone smf-7 has no significant homology with known sequences. We also analyzed the expression of these clones in other rat rhabdomyosarcoma cell lines (RMS-B and their clones) and in tumors obtained by injection of these cell lines into rats or nude mice. Smf-61 and smf-7 were the only clones with a differential expression pattern associated with the invasive or metastatic potential of all cell lines examined. A preliminary study of the expression of smf-7 and smf-61 in other cancer cell lines also showed mRNA expression in two human rhabdomyosarcomas and a human epidermoid carcinoma suggesting the existence of genes homologous to smf-7 and smf-61 clones in human cancers. Our findings suggest an association between the expression of smf-7 and smf-61 and invasive or metastatic potential of rhabdomyosarcoma cells.
authors.affiliation: Département de Pathologie, Université de Montréal, Canada.
authors.forename: L
authors.initials: L
authors.lastname: Daigneault
authors.forename: R
authors.initials: R
authors.lastname: Beaulieu
authors.forename: M
authors.initials: M
authors.lastname: Filion
authors.forename: L
authors.initials: L
authors.lastname: Gaboury
authors.forename: A
authors.initials: A
authors.lastname: Royal
authors.forename: F
authors.initials: F
authors.lastname: Babaï
mesh_terms: D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D017403:In Situ Hybridization; D008080:Liposarcoma / Q000235:genetics; D008297:Male; D008969:Molecular Sequence Data; D009361:Neoplasm Invasiveness; D012313:RNA / Q000737:chemistry; D051381:Rats; D011916:Rats, Inbred F344; D012208:Rhabdomyosarcoma / Q000235:genetics* / Q000473:pathology / Q000556:secondary*; D017422:Sequence Analysis, DNA; D012689:Sequence Homology, Nucleic Acid; D014407:Tumor Cells, Cultured
chemical_list: D018076:DNA, Complementary; D012313:RNA