title: Effect of S1P5 on proliferation and migration of human esophageal cancer cells.
abstract: OBJECTIVE
  To investigate the sphingosine 1-phosphate (S1P) receptor expression profile in human esophageal cancer cells and the effects of S1P5 on proliferation and migration of human esophageal cancer cells.
  
  
  METHODS
  S1P receptor expression profile in human esophageal squamous cell carcinoma cell line Eca109 was detected by semi-quantitative reverse transcription polymerase chain reaction. Eca109 cells were stably transfected with S1P5-EGFP or control-EGFP constructs. The relation between the responses of cell proliferation and migration to S1P and S1P5 expression was evaluated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide and migration assay, respectively.
  
  
  RESULTS
  Both normal human esophageal mucosal epithelium and Eca109 cells expressed S1P1, S1P2, S1P3 and S1P5, respectively. Esophageal mucosal epithelium expressed S1P5 at a higher level than Eca109 cell line. S1P5 over-expressing Eca109 cells displayed spindle cell morphology with elongated and extended filopodia-like projections. The proliferation response of S1P5-transfected Eca109 cells was lower than that of control vector-transfected cells with or without S1P stimulation (P < 0.05 or 0.01). S1P significantly inhibited the migration of S1P5-transfected Eca109 cells (P < 0.001). However, without S1P in transwell lower chamber, the number of migrated S1P5-transfected Eca109 cells was greater than that of control vector-transfected Eca109 cells (P < 0.001).
  
  
  CONCLUSIONS
  S1P binding to S1P5 inhibits the proliferation and migration of S1P5-transfected Eca109 cells. Esophageal cancer cells may down-regulate the expression of S1P5 to escape the inhibitory effect.
authors.affiliation: Department of Microbiology and Immunology, North Sichuan Medical College, Fujiang Road No. 234, Nanchong 637007, Sichuan Province, China. wmhu2002@yahoo.com.cn
authors.forename: Wei-Min
authors.initials: WM
authors.lastname: Hu
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Bao-Qian
authors.initials: BQ
authors.lastname: Jing
authors.forename: Yong-Sheng
authors.initials: YS
authors.lastname: Zhao
authors.forename: Chao-Li
authors.initials: CL
authors.lastname: Wang
authors.forename: Li
authors.initials: L
authors.lastname: Feng
authors.forename: Yong-En
authors.initials: YE
authors.lastname: Xie
mesh_terms: D000818:Animals; D002460:Cell Line; D045744:Cell Line, Tumor; D002465:Cell Movement; D049109:Cell Proliferation; D004305:Dose-Response Relationship, Drug; D004848:Epithelium / Q000473:pathology; D004947:Esophagus / Q000166:cytology; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008246:Lysophospholipids / Q000378:metabolism; D051379:Mice; D009092:Mucous Membrane / Q000473:pathology; D011485:Protein Binding; D049349:Receptors, Lysosphingolipid / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013110:Sphingosine / Q000031:analogs & derivatives / Q000378:metabolism; D014162:Transfection
chemical_list: D008246:Lysophospholipids; D049349:Receptors, Lysosphingolipid; C060506:sphingosine 1-phosphate; D013110:Sphingosine
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