title: Downregulation of stathmin is involved in malignant phenotype reversion and cell apoptosis in esophageal squamous cell carcinoma.
abstract: OBJECTIVE
  Stathmin plays a critical role in the regulation of mitosis and mediates the development of malignant tumors. Here, we investigated the potential role of stathmin in cell cycle and apoptosis in esophageal squamous cell carcinoma (ESCC).
  
  
  METHODS
  A stathmin short hairpin RNA (shRNA) plasmid was employed to downregulate stathmin expression in the ESCC cell line EC9706 cells. Cell proliferation was measured by cell counting, MTT, and colony formation assay. Cell migration was measured by Boyden chamber. Western blot was used to analyze the expressions of stathmin, survivin, and apoptosis-related proteins in transfected cells. Cell cycle and apoptosis were determined by flow cytometry and DNA ladder. Oncogenicity assay in nude mice was utilized to analyze phenotypic changes of transfected cells in vivo.
  
  
  RESULTS
  After transfection with stathmin shRNA plasmid, stathmin expression markedly decreased in EC9706 cells. Stathmin downregulation significantly inhibited cell proliferation, cell migration in vitro, and tumorigenicity in vivo, meanwhile arrested cell cycle in the G2/M phase and induced cell apoptosis. Further, stathmin downregulation resulted in downregulation of Bcl-2 and survivin proteins, activation of Caspase-3.
  
  
  CONCLUSIONS
  These findings demonstrate that stathmin may play an essential role in carcinogenesis of ESCC, which will lay a foundation for target therapy of ESCC.
authors.affiliation: Department of Oncology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, PR China.
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.forename: Liu-Xing
authors.initials: LX
authors.lastname: Wang
authors.forename: Sheng-Lei
authors.initials: SL
authors.lastname: Li
authors.forename: Ke
authors.initials: K
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: He
authors.forename: Hong-Tao
authors.initials: HT
authors.lastname: Liu
authors.forename: Qing-Xia
authors.initials: QX
authors.lastname: Fan
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000235:genetics*; D002294:Carcinoma, Squamous Cell / Q000378:metabolism* / Q000473:pathology; D053148:Caspase 3 / Q000378:metabolism; D002453:Cell Cycle / Q000235:genetics; D045744:Cell Line, Tumor; D002465:Cell Movement; D049109:Cell Proliferation; D015536:Down-Regulation; D004938:Esophageal Neoplasms / Q000378:metabolism* / Q000473:pathology; D005434:Flow Cytometry; D006801:Humans; D051034:Inhibitor of Apoptosis Proteins / Q000378:metabolism; D008297:Male; D051379:Mice; D008819:Mice, Nude; D010641:Phenotype; D010957:Plasmids; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism; D034741:RNA, Small Interfering; D050777:Stathmin / Q000378:metabolism*; D000077022:Survivin; D014162:Transfection
chemical_list: C107489:BIRC5 protein, human; D051034:Inhibitor of Apoptosis Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D034741:RNA, Small Interfering; D050777:Stathmin; D000077022:Survivin; D053148:Caspase 3