title: Expression patterns of cell cycle and apoptosis-related genes in a multidrug-resistant human colon carcinoma cell line.
abstract: BACKGROUND
  An in vitro multidrug resistance (MDR) system from a human colonic cancer cell line (SW620-MDR) has been established. To further study the mechanisms at molecular level and prevention of multidrug resistance in clinical practice, it was demonstrated that the expressions of several apoptosis-related and cell cycle regulator genes were changed in the cells.
  
  
  METHODS
  A multidrug-resistant colonic cell line (SW620-MDR) was established, and the Atlas human cDNA expression array was used for studying the pattern of gene expression in this cell line. Furthermore, Northern hybridization or real-time PCR analysis confirmed the pattern of gene expression.
  
  
  RESULTS
  In the SW620-MDR cell line the pro-apoptosis genes, CASP4, BIK, PDCD2, and TACE were expressed with decreased levels, and the antiapoptosis genes CD27-L and IGFBP2 were over-expressed. Furthermore, the cell cycle regulator genes such as CDK6, CCND1, CDC27HS, CDC16HS, Wee1Hu, MAPKK1, and IGFBP6 were expressed with decreased levels in the drug-resistant cell line.
  
  
  CONCLUSIONS
  It is worthwhile investigating whether the differentially expressed pattern of the aforementioned genes exists in the drug-resistant cancer specimens, and to further understand their functions in the cancer drug-resistance mechanism.
authors.affiliation: Division of Colon and Rectal Surgery, Chang Gung Memorial Hospital, Tao-Yuan, Taiwan.
authors.forename: C W
authors.initials: CW
authors.lastname: Fan
authors.forename: C C
authors.initials: CC
authors.lastname: Chan
authors.forename: C C K
authors.initials: CC
authors.lastname: Chao
authors.forename: H A
authors.initials: HA
authors.lastname: Fan
authors.forename: D L
authors.initials: DL
authors.lastname: Sheu
authors.forename: E C
authors.initials: EC
authors.lastname: Chan
mesh_terms: D017209:Apoptosis / Q000235:genetics*; D045744:Cell Line, Tumor; D003110:Colonic Neoplasms / Q000235:genetics*; D018432:Drug Resistance, Multiple / Q000235:genetics*; D019008:Drug Resistance, Neoplasm / Q000235:genetics*; D015870:Gene Expression; D015972:Gene Expression Regulation, Neoplastic; D018816:Genes, cdc; D006801:Humans; D020411:Oligonucleotide Array Sequence Analysis