title: Transcriptional activation of the human CD2AP promoter by E2F1.
abstract: CD2-associated protein (CD2AP) is an adaptor molecule involved in T cell receptor signaling and podocyte homeostasis. CD2AP-deficient mice develop nephritic syndrome and renal failure caused by glomerulosclerosis. Transcription factor E2F1 is a key regulator of cell proliferation and apoptosis. Here we report that E2F1 up-regulates the human CD2AP promoter and further increases the mRNA and protein levels of the human CD2AP in human embryonic kidney (HEK) 293 cells. By semi-quantitative RT-PCR and Western blot analysis we demonstrate that ectopic expression of E2F1 elevates the mRNA and protein levels of CD2AP. Consistently, transient transfection assays prove that overexpression of E2F1 transactivates the CD2AP promoter while knocking-down of endogenous E2F1 by a shRNA strategy results in reduction of the CD2AP promoter activity. Toward understanding the underlying mechanism of this regulation, we performed chromatin immunoprecipitation and mutations of the putative Sp1 binding sites, demonstrating that E2F1 can bind to Sp1 binding site and overexpression of E2F1 is capable of increasing the binding of E2F1 and decreasing the binding of Sp1 to Sp1 binding sites.
authors.affiliation: Department of Pediatrics, The First Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu Province, China.
authors.forename: Li
authors.initials: L
authors.lastname: Zou
authors.forename: Hua-Guo
authors.initials: HG
authors.lastname: Xu
authors.forename: Wei
authors.initials: W
authors.lastname: Ren
authors.forename: Rui
authors.initials: R
authors.lastname: Jin
authors.forename: Yi
authors.initials: Y
authors.lastname: Wang
authors.forename: Guo-Ping
authors.initials: GP
authors.lastname: Zhou
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000235:genetics*; D000818:Animals; D001483:Base Sequence; D001665:Binding Sites / Q000235:genetics; D047369:Chromatin Immunoprecipitation; D003598:Cytoskeletal Proteins / Q000235:genetics*; D004247:DNA / Q000378:metabolism; D050687:E2F1 Transcription Factor / Q000378:metabolism*; D055785:Gene Knockdown Techniques; D057809:HEK293 Cells; D006801:Humans; D051379:Mice; D008957:Models, Genetic; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D011401:Promoter Regions, Genetic; D011485:Protein Binding / Q000235:genetics; D034741:RNA, Small Interfering / Q000378:metabolism; D016329:Sp1 Transcription Factor / Q000378:metabolism; D015533:Transcriptional Activation / Q000235:genetics*; D015854:Up-Regulation / Q000235:genetics
chemical_list: D048868:Adaptor Proteins, Signal Transducing; C114545:CD2-associated protein; D003598:Cytoskeletal Proteins; D050687:E2F1 Transcription Factor; C493753:E2F1 protein, human; D034741:RNA, Small Interfering; D016329:Sp1 Transcription Factor; D004247:DNA