title: SP100 expression modulates ETS1 transcriptional activity and inhibits cell invasion.
abstract: The ETS1 transcription factor is a member of the Ets family of conserved sequence-specific DNA-binding proteins. ETS1 has been shown to play important roles in various cellular processes such as proliferation, differentiation, lymphoid development, motility, invasion and angiogenesis. These diverse roles of ETS1 are likely to be dependent on specific protein interactions. To identify proteins that interact with ETS1, a yeast two-hybrid screen was conducted. Here, we describe the functional interaction between SP100 and ETS1. SP100 protein interacts with ETS1 both in vitro and in vivo. SP100 is localized to nuclear bodies and ETS1 expression alters the nuclear body morphology in living cells. SP100 negatively modulates ETS1 transcriptional activation of the MMP1 and uPA promoters in a dose-dependent manner, decreases the expression of these endogenous genes, and reduces ETS1 DNA binding. Expression of SP100 inhibits the invasion of breast cancer cells and is induced by Interferon-alpha, which has been shown to inhibit the invasion of cancer cells. These data demonstrate that SP100 modulates ETS1-dependent biological processes.
authors.affiliation: Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC 29425, USA.
authors.forename: John S
authors.initials: JS
authors.lastname: Yordy
authors.forename: Runzhao
authors.initials: R
authors.lastname: Li
authors.forename: Victor I
authors.initials: VI
authors.lastname: Sementchenko
authors.forename: Huiping
authors.initials: H
authors.lastname: Pei
authors.forename: Robin C
authors.initials: RC
authors.lastname: Muise-Helmericks
authors.forename: Dennis K
authors.initials: DK
authors.lastname: Watson
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D034961:Antigens, Nuclear / Q000502:physiology*; D001324:Autoantigens / Q000502:physiology*; D001483:Base Sequence; D001943:Breast Neoplasms / Q000378:metabolism / Q000473:pathology; D002352:Carrier Proteins / Q000502:physiology*; D045744:Cell Line, Tumor; D002467:Cell Nucleus / Q000378:metabolism; D056970:Co-Repressor Proteins; D017931:DNA Primers; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D018832:Molecular Chaperones; D009361:Neoplasm Invasiveness; D009687:Nuclear Proteins / Q000502:physiology*; D020798:Two-Hybrid System Techniques
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D034961:Antigens, Nuclear; D001324:Autoantigens; D002352:Carrier Proteins; D056970:Co-Repressor Proteins; C106985:DAXX protein, human; D017931:DNA Primers; D047908:Intracellular Signaling Peptides and Proteins; D018832:Molecular Chaperones; D009687:Nuclear Proteins; C066642:SP100 protein, human