title: Identification of BMP2 as an epigenetically silenced growth inhibitor in rhabdomyosarcoma.
abstract: Rhabdomyosarcoma (RMS) is the most common soft-tissue sarcoma of infancy and although therapy has improved over the years, mortality is still fairly high. The establishment of new treatments has been hampered by the limited knowledge of the molecular mechanisms driving development of RMS. One characteristic of cancer cells is aberrant DNA methylation, which could lead to silencing of tumor suppressor genes. However, only a few epigenetically silenced genes have been described in RMS so far. We performed an expression profiling analysis of three RMS cell lines that were treated with the demethylating agent 5'-aza-2'-deoxycytidine (5-Aza‑dC) facilitating re-expression of epigenetically silenced genes. This treatment induced the gene BMP2 (bone morphogenetic protein 2) throughout all cell lines. Detailed methylation analysis of CpG sites in the BMP2 promoter region by bisulfite sequencing and methylation-specific PCR revealed that a high degree of DNA methylation is causatively associated with the suppression of BMP2 in RMS cells. Consequently, treatment of the RMS cell lines with 5-Aza-dC resulted in DNA demethylation of the BMP2 promoter, most prominently in alveolar RMS. Supplementation of recombinant human BMP2 (rhBMP2) led to a reduced viability of RMS cells. Altogether, these findings suggest that suppression of BMP2 by epigenetic silencing may play a critical role in the genesis of RMS, thereby providing a rationale for the development of a new treatment strategy for RMS.
authors.affiliation: Department of Pediatric Surgery, Dr. von Hauner Children's Hospital, Ludwig-Maximilians-University Munich, D-80337 Munich, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Wolf
authors.affiliation: Department of Pediatric Surgery, Dr. von Hauner Children's Hospital, Ludwig-Maximilians-University Munich, D-80337 Munich, Germany.
authors.forename: Beate
authors.initials: B
authors.lastname: Hagl
authors.affiliation: Department of Pediatric Surgery, Dr. von Hauner Children's Hospital, Ludwig-Maximilians-University Munich, D-80337 Munich, Germany.
authors.forename: Roland
authors.initials: R
authors.lastname: Kappler
mesh_terms: D055396:Bone Morphogenetic Protein 2 / Q000235:genetics*; D045744:Cell Line, Tumor; D018899:CpG Islands; D019175:DNA Methylation; D044127:Epigenesis, Genetic; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D066298:In Vitro Techniques; D051798:Inhibitor of Differentiation Protein 1 / Q000235:genetics; D051796:Inhibitor of Differentiation Proteins / Q000235:genetics; D009363:Neoplasm Proteins / Q000235:genetics; D011401:Promoter Regions, Genetic; D012208:Rhabdomyosarcoma / Q000235:genetics* / Q000473:pathology*; D015398:Signal Transduction / Q000235:genetics
chemical_list: C525718:BMP2 protein, human; D055396:Bone Morphogenetic Protein 2; C497453:ID1 protein, human; D051798:Inhibitor of Differentiation Protein 1; D051796:Inhibitor of Differentiation Proteins; D009363:Neoplasm Proteins; C075640:ID3 protein, human