title: N-myc downstream-regulated gene 1/Cap43 expression promotes cell differentiation of human osteosarcoma cells.
abstract: The N-myc downstream regulated gene 1 (NDRG1)/Cap43 is closely associated with cell differentiation, and its expression is induced by hypoxia and increasing intracellular calcium levels. Whether the NDRG1/Cap43 expression in cancer cells is a predictive marker of good or poor prognosis in patients, depends upon tumor types and differentiation status. In this study, we examined whether the NDRG1/Cap43 expression was involved in the differentiation of osteosarcoma cells, using three osteosarcoma cell lines, MG63, U2OS and SaOS2. The NDRG1/Cap43 expression in MG63 and U2OS was significantly enhanced by vitamin D3, which also induced the production of osteocalcin, a differentiation marker of osteoblasts. The knockdown of NDRG1/Cap43 using small interfering RNA also suppressed the production of osteocalcin and enhanced cell proliferation, accompanied by the suppression of p21 expression. Furthermore, the acquired invasiveness of osteosarcoma cells during the invasion in Matrigel resulted in the decreased expression of NDRG1/Cap43. On the basis of these results, our proposed role for NDRG1/Cap43 would be in the capacity of differentiation and invasion in osteosarcoma cells.
authors.affiliation: Department of Orthopaedic Surgery, Kurume University School of Medicine, Kurume 830-0011, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Matsugaki
authors.forename: Michihisa
authors.initials: M
authors.lastname: Zenmyo
authors.forename: Koji
authors.initials: K
authors.lastname: Hiraoka
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Fukushima
authors.forename: Takanori
authors.initials: T
authors.lastname: Shoda
authors.forename: Setsuro
authors.initials: S
authors.lastname: Komiya
authors.forename: Mayumi
authors.initials: M
authors.lastname: Ono
authors.forename: Michihiko
authors.initials: M
authors.lastname: Kuwano
authors.forename: Kensei
authors.initials: K
authors.lastname: Nagata
mesh_terms: D001859:Bone Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D002454:Cell Differentiation / Q000187:drug effects; D045744:Cell Line, Tumor; D002465:Cell Movement; D002762:Cholecalciferol / Q000494:pharmacology; D050759:Cyclin-Dependent Kinase Inhibitor p21 / Q000378:metabolism; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins / Q000235:genetics / Q000378:metabolism*; D009361:Neoplasm Invasiveness; D015675:Osteocalcin / Q000378:metabolism; D012516:Osteosarcoma / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D034622:RNA Interference; D013997:Time Factors; D000099259:N-myc Downstream-Regulated Gene 1 Protein
chemical_list: D018797:Cell Cycle Proteins; D002762:Cholecalciferol; D050759:Cyclin-Dependent Kinase Inhibitor p21; D047908:Intracellular Signaling Peptides and Proteins; D015675:Osteocalcin; D000099259:N-myc Downstream-Regulated Gene 1 Protein; C493956:CDKN1A protein, human