title: Oxaliplatin enhances TRAIL-induced apoptosis in gastric cancer cells by CBL-regulated death receptor redistribution in lipid rafts.
abstract: Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) is a member of the tumor necrosis factor family that selectively induces apoptosis in cancer cells. However, gastric cancer cells are insensitive to TRAIL. In the present study, we show that oxaliplatin enhanced TRAIL-induced apoptosis of MGC803, BGC823, and SGC7901 cells. Oxaliplatin promoted death receptor 4 (DR4) and death receptor 5 (DR5) clustering into aggregated lipid rafts, while the cholesterol-sequestering agent nystatin partially prevented lipid raft aggregation, DR4 and DR5 clustering, and reduced apoptosis. Furthermore, the expression of the casitas B-lineage lymphoma (Cbl) family was downregulated by oxaliplatin. Transfection of c-Cbl or Cbl-b partially reversed oxaliplatin-induced lipid raft aggregation. These results indicated that oxaliplatin enhanced TRAIL-induced gastric cancer cell apoptosis at least partially through Cbl-regulated death receptor redistribution in lipid rafts.
authors.affiliation: Department of Medical Oncology, The First Hospital of China Medical University, Shenyang 110001, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Xu
authors.forename: Xiujuan
authors.initials: X
authors.lastname: Qu
authors.forename: Ye
authors.initials: Y
authors.lastname: Zhang
authors.forename: Xuejun
authors.initials: X
authors.lastname: Hu
authors.forename: Xianghong
authors.initials: X
authors.lastname: Yang
authors.forename: Kezuo
authors.initials: K
authors.lastname: Hou
authors.forename: Yuee
authors.initials: Y
authors.lastname: Teng
authors.forename: Jingdong
authors.initials: J
authors.lastname: Zhang
authors.forename: Kiyonao
authors.initials: K
authors.lastname: Sada
authors.forename: Yunpeng
authors.initials: Y
authors.lastname: Liu
mesh_terms: D017209:Apoptosis / Q000187:drug effects*; D002460:Cell Line; D015536:Down-Regulation / Q000187:drug effects; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D021962:Membrane Microdomains / Q000187:drug effects / Q000378:metabolism*; D009761:Nystatin / Q000494:pharmacology; D009944:Organoplatinum Compounds / Q000494:pharmacology*; D000077150:Oxaliplatin; D050721:Proto-Oncogene Proteins c-cbl / Q000235:genetics / Q000378:metabolism*; D053218:Receptors, Death Domain / Q000378:metabolism*; D013274:Stomach Neoplasms / Q000378:metabolism* / Q000473:pathology; D053221:TNF-Related Apoptosis-Inducing Ligand / Q000494:pharmacology*
chemical_list: D009944:Organoplatinum Compounds; D053218:Receptors, Death Domain; D053221:TNF-Related Apoptosis-Inducing Ligand; D000077150:Oxaliplatin; D009761:Nystatin; D050721:Proto-Oncogene Proteins c-cbl