Direct binding of Nur77/NAK-1 to the plasminogen activator inhibitor 1 (PAI-1) promoter regulates TNFα-induced PAI-1 expression by Florian Gruber, Peter.

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Direct binding of Nur77/NAK-1 to the plasminogen activator inhibitor 1 (PAI-1) promoter regulates TNFα-induced PAI-1 expression by Florian Gruber, Peter Hufnagl, Renate Hofer-Warbinek, Johannes A. Schmid, Johannes M. Breuss, Renate Huber-Beckmann, Markus Lucerna, Nikolina Papac, Hanna Harant, Ivan Lindley, Rainer de Martin, and Bernd R. Binder Blood Volume 101(8):3042-3048 April 15, 2003 ©2003 by American Society of Hematology

Expression of PAI-1 mRNA and PAI-1 reporter studies Expression of PAI-1 mRNA and PAI-1 reporter studies.(A) Relative quantitative PCR (Q-PCR) analysis of PAI-1 mRNA expression. Expression of PAI-1 mRNA and PAI-1 reporter studies.(A) Relative quantitative PCR (Q-PCR) analysis of PAI-1 mRNA expression. HUVECs were stimulated with TNFα for the indicated periods and harvested. Relative expression of PAI-1 was normalized to the expression of β-2 microglobulin. The inset shows nuclear run-on data. HUVECs were either untreated or treated for 4 hours with TNFα, and the RNA isolated after the run-on reaction was hybridized to PAI-1 and GAPDH probes that were immobilized on membranes. (B) Reporter gene analysis. A series of deletions in the PAI-1 promoter were fused to a luciferase reporter gene, transfected into HUVECs, and measured by luminometry. HUVECs expressing the reporter gene constructs were induced with TNFα. (C) EMSAs of overlapping parts of the PAI-1 promoter. Nuclear extracts were obtained from HUVECs and incubated with labeled double-stranded oligonucleotides representing the nt −280 to −260, −270 to −250, and −260 to −240 of the PAI-1 promoter, respectively. Specific binding activity of nuclear protein complexes is indicated by black arrows. (D) Overview of the region of the PAI-1 promoter containing the NBRE. Oligonucleotide sequences that were used for EMSAs and for the yeast screens are shown. Light gray indicates care consensus sequence; dark gray, 2 additional adenines required for binding; and black, nucleotides exchanged. Florian Gruber et al. Blood 2003;101:3042-3048 ©2003 by American Society of Hematology

PAI-1 promoter: EMSAs and supershifts of Nur77 PAI-1 promoter: EMSAs and supershifts of Nur77.(A) Overexpression of a truncated clone of Nur77 (amino acids 248 to 580 that have full DNA-binding activity) in MCF-7 cells (lanes 1-4) and addition of the E-20 antibody, which recognizes the C-terminus of the... PAI-1 promoter: EMSAs and supershifts of Nur77.(A) Overexpression of a truncated clone of Nur77 (amino acids 248 to 580 that have full DNA-binding activity) in MCF-7 cells (lanes 1-4) and addition of the E-20 antibody, which recognizes the C-terminus of the Nur77 family of proteins (lane 5). JURKAT cells were induced with ionomycin and PMA (Ion+PMA) and incubated with a radio-labeled NBRE found in the PAI-1 promoter (P, lanes 6-10) and a canonical consensus NBRE (N, lanes 11-14). The extracts were also incubated with E-20 antibody (lanes 8,13). Binding was competed with a 100-fold molar excess of unlabeled oligonucleotides as indicated (PAI-NBRE, P; Con NBRE, N). Specific binding activity of nuclear protein complexes is indicated by black arrows. A supershift resulting from binding of the Nur77 antibody is indicated by white arrows. (B) HUVECs were stimulated with TNFα, and nuclear extracts were incubated with radioactively labeled oligonucleotides containing the NBRE of the PAI-1 promoter (P). The same extracts were incubated with radioactively labeled oligonucleotides containing the NBRE of the PAI-1 promoter that was mutated in the positions indicated in Figure 1D (PAI-T15A, T; PAI-A11C, A). Specific binding activity of nuclear protein complexes is indicated by black arrows. Florian Gruber et al. Blood 2003;101:3042-3048 ©2003 by American Society of Hematology

Expression of Nur77 and PAI-1 in HUVECs induced with TNFα Expression of Nur77 and PAI-1 in HUVECs induced with TNFα.(A) Q-PCR analysis of Nur77 and PAI-1 mRNA expression. Expression of Nur77 and PAI-1 in HUVECs induced with TNFα.(A) Q-PCR analysis of Nur77 and PAI-1 mRNA expression. HUVECs were induced with TNFα for the indicated minutes; relative expression was normalized to β-2 microglobulin. The inset shows a Western blot of HUVECs stimulated for the indicated number of seconds with TNFα and stained using an antibody recognizing the N-terminus of Nur77 (representative experiment). (B) Immunocytochemistry. HUVECs were stimulated by TNFα for indicated periods and stained with antibodies recognizing Nur77 or PAI-1. (C) Q-PCR analysis of Nur77 and PAI-1 mRNA expression. HUVECs were induced with LPS and IL-1 for the indicated time periods (±SD of triplicates). Florian Gruber et al. Blood 2003;101:3042-3048 ©2003 by American Society of Hematology

Analysis of PAI-1 reporter gene activity and protein expression upon coexpression of full-length and dominant-negative Nur77 constructs.(A) PAI-1 reporter gene activity. Analysis of PAI-1 reporter gene activity and protein expression upon coexpression of full-length and dominant-negative Nur77 constructs.(A) PAI-1 reporter gene activity. Bars 1 to 3 represent overexpression of Nur77 as well as TNFα induction in HUVECs; bars 4 and 5 represent overexpression of a dominant-negative mutant of Nur77 lacking its transactivation domain in untreated or TNFα-stimulated HUVECs; bars 6 and 7 represent the activity of a PAI-1 reporter gene construct lacking the 20 bp containing the NBRE with and without TNFα stimulation. Black bars are TNFα+(±SD of triplicates). (B) 4 × NBRE reporter gene activity. Effect of TNFα stimulation and overexpression of Nur77 on activity of a reporter gene construct containing a 4 × tandem repeat of an NBRE fused to a minimal promoter. Black bars are TNFα+ (±SD of triplicates). (C) Immunocytochemistry. HUVECs were transiently transfected to express EGFP or dnNur77-EGFP. After treatment with TNFα for 4 hours, cells expressing EGFP alone (green nuclear and cytoplasmatic signal) as well as untransfected cells produced large amounts of PAI-1 protein (red), whereas cells expressing dnNur77 (green, nuclear localization) showed no expression of PAI-1. Original magnification × 100 (C). Florian Gruber et al. Blood 2003;101:3042-3048 ©2003 by American Society of Hematology

Nur77 and PAI-1 expression in normal and atherosclerotic vascular tissues.(A-D) Minimal expression for Nur77 (A) and PAI-1 (B) in normal vessels; high expression of both proteins in the plaque area in endothelial cells and smooth muscle cells in an atherosc... Nur77 and PAI-1 expression in normal and atherosclerotic vascular tissues.(A-D) Minimal expression for Nur77 (A) and PAI-1 (B) in normal vessels; high expression of both proteins in the plaque area in endothelial cells and smooth muscle cells in an atherosclerotic coronary artery (C-D). The 50-μm scale bar in panel D applies to panels A-D. (E-G) Coimmunostaining of Nur77 and PAI-1 in a human atherosclerotic lesion. The vessel was stained for Nur77 (green, E), PAI-1 (red, F), or CD31 (blue, G). The 100-μm scale bar in panel G applies to panels E-G. (H-J) Endothelial cells of vasa vasora in human atherosclerotic coronary arteries express both Nur77 (H) and PAI-1 (J), which colocalize (I). The 20-μm scale bar in panel J applies to panels H-J. (K-M) Expression of Nur77 in a human atherosclerotic vessel (K) with higher expression in the neointima (L) and lower expression in the media (M). Panels L and M show further magnification of the indicated areas of panel K. Florian Gruber et al. Blood 2003;101:3042-3048 ©2003 by American Society of Hematology