title: [Induction of multidrug resistance in Tca8113 cells by transient exposure to different chemotherapeutic drugs].
abstract: OBJECTIVE
  The purpose of this study was to determine the effect of transient exposure to chemotherapeutic drugs on multidrug resistance of Tca8113 cells.
  
  
  METHODS
  The MDR1 and MRP gene expressions in Tca8113 and K562/ADM cells lines were analyzed using reverse transcription polymerase chain reaction (RT-PCR), after the cells were treated with different cytotoxic drugs. The function and expressions of P-glycoprotein 170 and multidrug resistant associated protein were studied using fluorescence photometric assays.
  
  
  RESULTS
  The inhibitive rate of Tca8113 cells was higher than that of K562/ADM, after exposure to chemotherapeutic drugs. The transient exposure to cytotoxic drugs weakly induced MDR1 and multidrug resistant associated protein expression in Tca8113 cells. The intracellular drug concentration in K562/ADM was lower than that in Tca8113 cells.
  
  
  CONCLUSIONS
  Induction of MDR1 and multidrug resistant associated protein gene expression response to cytotoxic drugs may be related with the increased multidrug resistance in drug-treated human tumor cells.
authors.affiliation: Department of Oral and Maxillofacial Surgery, West China College of Stomatology, Sichuan University, Chengdu 610041, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Zhang
authors.forename: Dazhang
authors.initials: D
authors.lastname: Wang
authors.forename: Guangyong
authors.initials: G
authors.lastname: Zheng
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000096:biosynthesis / Q000235:genetics*; D000970:Antineoplastic Agents / Q000494:pharmacology; D001761:Bleomycin / Q000031:analogs & derivatives* / Q000494:pharmacology; D002294:Carcinoma, Squamous Cell / Q000473:pathology; D002945:Cisplatin / Q000494:pharmacology; D018432:Drug Resistance, Multiple / Q000235:genetics*; D019008:Drug Resistance, Neoplasm / Q000235:genetics*; D019450:Genes, MDR / Q000187:drug effects; D006801:Humans; D020014:K562 Cells; D008727:Methotrexate / Q000494:pharmacology; D027425:ATP-Binding Cassette, Sub-Family C Proteins / Q000096:biosynthesis / Q000235:genetics; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014062:Tongue Neoplasms / Q000473:pathology*; D014407:Tumor Cells, Cultured
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000970:Antineoplastic Agents; D001761:Bleomycin; D002945:Cisplatin; D008727:Methotrexate; D027425:ATP-Binding Cassette, Sub-Family C Proteins; D012333:RNA, Messenger; C021771:zhengguangmycin