title: Bufalin Inhibits the Differentiation and Proliferation of Cancer Stem Cells Derived from Primary Osteosarcoma Cells through Mir-148a.
abstract: OBJECTIVE
  Osteosarcoma (OS) is the second leading cause of cancer-related death in children and young adults. Chemoresistance is the most important cause of treatment failure in OS, largely resulting from presence of cancer stem cells (CSCs). However, CSCs isolated from cancer cell lines do not necessarily represent those from primary human tumors due to accumulation of genetic aberrations that increase with passage number. Therefore, studies on CSCs from primary OS may be more important for understanding the mechanisms driving the chemoresistance of CSCs in OS.
  
  
  METHODS
  We established a primary culture of OS cells, known as C1OS, from freshly resected tumor tissue. We further isolated CSCs from C1OS cells (C1OS-CSCs). We analyzed the effects of bufalin, a traditional Chinese medicine, on the stemness of C1OS-CSCs. We also analyzed the microRNA (miR) targets of bufalin on the stemness of C1OS-CSCs. Moreover, we examined these findings in the OS specimen.
  
  
  RESULTS
  Bufalin inhibited the stemness of C1OS-CSCs. Moreover, we found that miR-148a appeared to be a target of bufalin, and miR-148a further regulated DNMT1 and p27 to control the stemness of OS cells. This mechanism was further confirmed in OS specimen.
  
  
  CONCLUSIONS
  Our data suggest that bufalin may be a promising treatment for OS, and its function may be conducted through regulation of miR-148a.
authors.affiliation: Department of Orthopedics and Traumatology, Shuguang Hospital affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China.
authors.forename: Yuewen
authors.initials: Y
authors.lastname: Chang
authors.forename: Yongfang
authors.initials: Y
authors.lastname: Zhao
authors.forename: Wei
authors.initials: W
authors.lastname: Gu
authors.forename: Yuelong
authors.initials: Y
authors.lastname: Cao
authors.forename: Shuqiang
authors.initials: S
authors.lastname: Wang
authors.forename: Jian
authors.initials: J
authors.lastname: Pang
authors.forename: Yinyu
authors.initials: Y
authors.lastname: Shi
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D001859:Bone Neoplasms / Q000188:drug therapy / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D002018:Bufanolides / Q000494:pharmacology*; D002454:Cell Differentiation / Q000187:drug effects*; D049109:Cell Proliferation / Q000187:drug effects; D050760:Cyclin-Dependent Kinase Inhibitor p27 / Q000235:genetics / Q000378:metabolism; D000076123:DNA (Cytosine-5-)-Methyltransferase 1; D004248:DNA (Cytosine-5-)-Methyltransferases / Q000235:genetics / Q000378:metabolism; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008516:Medicine, Chinese Traditional; D051379:Mice; D035683:MicroRNAs / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism; D014411:Neoplastic Stem Cells / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D012516:Osteosarcoma / Q000188:drug therapy / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D061251:Primary Cell Culture; D015398:Signal Transduction
chemical_list: D000970:Antineoplastic Agents; D002018:Bufanolides; C550570:MIRN148 microRNA, human; D035683:MicroRNAs; D050760:Cyclin-Dependent Kinase Inhibitor p27; D000076123:DNA (Cytosine-5-)-Methyltransferase 1; D004248:DNA (Cytosine-5-)-Methyltransferases; C000619380:DNMT1 protein, human; C000619381:Dnmt1 protein, mouse; C022777:bufalin