title: Silencing of tumor necrosis factor receptor 1 by siRNA in EC109 cells affects cell proliferation and apoptosis.
abstract: Tumor necrosis factor receptor 1 (TNFR1) is a membrane receptor able to bind TNF-alpha or TNF-beta. TNFR1 can suppress apoptosis by activating the NF-kappaB or JNK/SAPK signal transduction pathway, or it can induce apoptosis through a series of caspase cascade reactions; the particular effect may depend on the cell line. In the present study, we first showed that TNFR1 is expressed at both the gene and protein levels in the esophageal carcinoma cell line EC109. Then, by applying a specific siRNA, we silenced the expression of TNFR1; this resulted in a significant time-dependent promotion of cell proliferation and downregulation of the apoptotic rate. These results suggest that TNFR1 is strongly expressed in the EC109 cell line and that it may play an apoptosis-mediating role, which may be suppressed by highly activated NF-kappaB.
authors.affiliation: Department of Histology and Embryology, Medical College of Shantou University, Shantou, Guangdong Province 515041, China.
authors.forename: Ma
authors.initials: M
authors.lastname: Changhui
authors.forename: Ma
authors.initials: M
authors.lastname: Tianzhong
authors.forename: Su
authors.initials: S
authors.lastname: Zhongjing
authors.forename: Chen
authors.initials: C
authors.lastname: Ling
authors.forename: Wang
authors.initials: W
authors.lastname: Ning
authors.forename: Zhu
authors.initials: Z
authors.lastname: Ningxia
authors.forename: Chen
authors.initials: C
authors.lastname: Xiancai
authors.forename: Chen
authors.initials: C
authors.lastname: Haibin
mesh_terms: D017209:Apoptosis; D002277:Carcinoma / Q000378:metabolism*; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D015536:Down-Regulation; D004938:Esophageal Neoplasms / Q000378:metabolism*; D015972:Gene Expression Regulation, Neoplastic; D020868:Gene Silencing; D006801:Humans; D048670:MAP Kinase Kinase 4 / Q000378:metabolism; D016328:NF-kappa B / Q000378:metabolism*; D034741:RNA, Small Interfering / Q000378:metabolism*; D047888:Receptors, Tumor Necrosis Factor, Type I / Q000235:genetics*; D015398:Signal Transduction; D013997:Time Factors
chemical_list: D016328:NF-kappa B; D034741:RNA, Small Interfering; D047888:Receptors, Tumor Necrosis Factor, Type I; D048670:MAP Kinase Kinase 4