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Arteriosclerosis, Thrombosis, and Vascular Biology. 2001;21:917-922

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(Arteriosclerosis, Thrombosis, and Vascular Biology. 2001;21:917.)
© 2001 American Heart Association, Inc.


Vascular Biology

Function of GATA Transcription Factors in Induction of Endothelial Vascular Cell Adhesion Molecule-1 by Tumor Necrosis Factor-{alpha}

Michihisa Umetani; Chikage Mataki; Naoko Minegishi; Masayuki Yamamoto; Takao Hamakubo; Tatsuhiko Kodama

From the Department of Molecular Biology and Medicine (M.U., C.M., T.H., T.K.), Research Center for Advanced Science and Technology, University of Tokyo, Tokyo, Japan, and the Center for Tsukuba Advanced Research Alliance (N.M., M.Y.), University of Tsukuba, Tsukuba, Japan.

Correspondence to Michihisa Umetani, Department of Molecular Biology and Medicine, #35, RCAST, University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-0084, Japan. E-mail umetani-tky{at}umin.ac.jp


*    Abstract
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Abstract—Endothelial vascular cell adhesion molecule-1 (VCAM-1) is expressed in response to cytokine stimulation and plays a critical role in inflammatory reactions. Previously, we developed a novel VCAM-1 inhibitor that acts through a mechanism independent of nuclear factor-{kappa}B activity. It suppresses the binding activity of GATA proteins in cytokine-stimulated endothelial cells, which may be related to the anti–VCAM-1 induction effect of this drug. In this study, we investigated the role of GATA proteins in the induction of VCAM-1 by tumor necrosis factor-{alpha} (TNF-{alpha}) in human endothelial cells. The mRNA expression of GATA-6 was increased, whereas GATA-3 mRNA was decreased by TNF-{alpha} stimulation. Electrophoretic mobility shift assay showed that TNF-{alpha} stimulation increased the DNA binding of GATA-6 but decreased that of GATA-3. Experiments using protein overexpression or antisense oligonucleotides revealed that GATA-6 potently acts as a positive regulator of VCAM-1 gene transcription. In contrast, overexpression of GATA-3 was able to suppress TNF-{alpha}–induced VCAM-1 expression. Our results provide evidence of the importance of GATA proteins in the induction of VCAM-1 by TNF-{alpha} in vascular endothelial cells. The switch from GATA-3 to GATA-6 is taken to be an important transcriptional control event in TNF-{alpha} induction of VCAM-1.


Key Words: endothelial cells • vascular cell adhesion molecule-1 • GATA transcription factor • tumor necrosis factor-{alpha} • human umbilical vein endothelial cells


*    Introduction
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*Introduction
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Adherence to the blood vessel wall via cell adhesion molecules is an important step in leukocyte migration.1 Vascular cell adhesion molecule-1 (VCAM-1) is a cell surface glycoprotein that belongs to the immunoglobulin superfamily, and its expression is dependent on cytokine stimulation. In the vascular system, VCAM-1 is expressed on activated endothelial cells, smooth muscle cells, and fibroblasts in a variety of pathological conditions, including atherosclerosis.2 3 4

In the VCAM-1 gene regulatory region, functional transcription factor binding motifs have been reported, including nuclear factor (NF)-{kappa}B, stimulatory protein-1, interferon regulatory factor, activator protein-1, and GATA.5 6 7 8 GATA proteins are members of a zinc finger protein family of transcription factors that recognize the consensus (A/T) GATA(A/G) and related sequences.9 They are essential for the differentiation and function of hematopoietic cells and endothelial cells as well as fetal differentiation of the cardiovascular system.10 11 12 Although several lines of evidence have provided support for the importance of the GATA element in the upstream promoter region of the VCAM-1 gene,5 8 13 14 the specific regulatory effects exerted by the GATA factors on endothelial gene expression have yet to be elucidated. Recently, we developed a novel VCAM-1 inhibitor, K-7174, which acts through a mechanism independent of NF-{kappa}B activity.15 K-7174 suppressed the binding activity of GATA proteins in cytokine-stimulated human umbilical vein endothelial cells (HUVECs), which may be related to the anti–VCAM-1 induction effect of this drug. To elucidate the roles of the GATA proteins on the regulation of cytokine-mediated VCAM-1 induction in human endothelial cells, we further undertook sequential studies and found that multiple GATA proteins exhibit differing responses to tumor necrosis factor-{alpha} (TNF-{alpha}) stimulation and play important roles in the regulation of VCAM-1 induction.


*    Methods
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Cell Culture, RNA Preparation, and Northern Blot Analysis
HUVECs were purchased from Clonetics and cultured by EGM-2 medium containing 2% FCS (Clonetics). Three or 4 time-passaged cells were used for the experiments. HUVECs were stimulated with TNF-{alpha} (10 U/mL, Genzyme) for 4 hours. Total RNA was then isolated by TRIZOL reagent (Life Technologies) according to the manufacturer’s protocol and was used for poly(A)+ mRNA isolation (Takara). The concentration of mRNA was determined by the optical density at 260 nm. Two micrograms of mRNA was dissolved in 2.2 mol/L formaldehyde, denatured at 65°C for 15 minutes, and electrophoresed in a 1% agarose gel containing 2.2 mol/L formaldehyde. After transfer to nitrocellulose membranes (Hybond XL, Amersham Pharmacia Biotech), the filters were hybridized with 2x106 cpm of [{alpha}-32P]dCTP-labeled probes per milliliter. The GATA-2, GATA-3, and GATA-6 cDNA fragments used for the probes were amplified from the HUVEC total RNA by reverse transcription and polymerase chain reaction (PCR) performed with a GeneAmp RNA PCR kit (PE Biosystems). The GATA-4 and GATA-5 cDNA fragments were amplified from Multiple Choice cDNA (OriGene Technologies) by PCR. The amplified fragments were as follows (nucleotide 1 is the A of the ATG codon that encodes the initiator methionine in each cDNA): GATA-2, bp 1 to 463 (463 nt), GATA-3, bp 226 to 639 (414 nt); GATA-4, bp 956 to 1329 (374 nt); GATA-6, bp 1 to 682 (682 nt); and GAPDH, bp 903 to 1185 (283 nt). PCR amplification for the GATA-5 cDNA fragment was performed as described elsewhere.16 The hybridized filters were washed and exposed to imaging screens (Bio-Rad).

Electrophoretic Mobility Shift Assay
HUVECs were grown to confluence and were stimulated by TNF-{alpha} (10 U/mL) for 2 hours. Nuclear extract preparation from HUVECs and electrophoretic mobility shift assay (EMSA) were performed as described previously.15 Binding reactions were left on ice for 30 minutes, and the complexes were resolved by electrophoresis on 3.5% nondenaturing acrylamide gels in 0.25x Tris-borate-EDTA buffer. Gels were dried and exposed to imaging screens (Bio-Rad). To ascertain the binding to the GATA motif, the binding reaction was performed in the presence of 100-fold unlabeled specific or nonspecific competitor DNA fragments. Mutant unlabeled oligonucleotides with a respective GATA sequence changed to TCGA were also used (FigureDown I, which can be accessed online at http://atvb.ahajournals.org). For supershift assays, antibodies (1 µg) were added to reaction tubes with the 32P-labeled probe, and the reaction tubes were incubated on ice for 2 hours. Anti–GATA-2 was raised against polypeptides in the N-terminal region of human GATA-2 via subcutaneous injection into rabbits. Mouse anti–GATA-3 and goat anti–GATA-6 antibodies were purchased from Santa Cruz Biotechnology.



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Figure 1. Differences among GATA factors on mRNA expression in response to TNF-{alpha} stimulation. Representative results from >3 independent experiments are shown.

Plasmid Expression Vectors
The expression vectors for human GATA-2, human GATA-3, and mouse GATA-6 have previously been described.17 18 19 The expression vectors (2 µg/mL) were transfected to HUVECs by use of TransIT-LT1 (Mirus). Twenty-four hours after transfection, cells were stimulated with TNF-{alpha} for 6 hours, and the cell surface expression of VCAM-1 was analyzed by flow cytometry.

Flow Cytometric Analysis
Flow cytometric analysis was performed as described previously.15 Briefly, HUVECs were harvested with the use of a cell scraper. After incubation for 1 hour at 4°C with anti–VCAM-1 antibody (Genzyme), anti–intercellular adhesion molecule-1 (anti–ICAM-1) antibody (R&D), or mouse isotype control IgG (Pharmingen), cells were counterstained with FITC-labeled anti-mouse IgG F(ab')2 (DAKO) and were analyzed on an EPICS XL (Beckman Coulter) or a FACS Calibur (Becton Dickinson).

Antisense Oligonucleotides
Antisense phosphorothioate oligodeoxynucleotides were designed against the translational start region of GATA-318 and GATA-6.20 Design of the GATA-2 antisense oligonucleotide has been previously reported.21 As a control, scrambled oligonucleotides randomizing the antisense sequence were designed as well. The respective sequence of the antisense oligonucleotides to GATA factors was as follows: GATA-2, CAGCACGGCCGGGTGCGC; GATA-3, CGCCGTCACCTCCATGGCCTC; and GATA-6, GGTCTGGTACATCTCCTCCG. Antisense or randomly scrambled oligonucleotide was transfected to HUVECs with TransIT-LT1. Twenty-four hours after transfection, cells were stimulated with TNF-{alpha} for 6 hours, and the cell surface expression of VCAM-1 and ICAM-1 was analyzed by flow cytometry. To certify the incorporation of the oligonucleotides by the cells, oligonucleotides were labeled with FITC and transfected to HUVECs as described above. Twenty-nine hours after the transfection, cells were observed by fluorescence microscopy.

Statistical Analysis
Results of the experimental studies are reported as mean±SEM. Differences were analyzed by 1-way ANOVA followed by the Fisher protected least significant difference test.


*    Results
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Different mRNA Expression of GATA Factors in Response to TNF-{alpha} Stimulation
We examined the expression of GATA factors in HUVECs and their responses to TNF-{alpha} stimulation by Northern blot analysis. A previous study reported the existence of GATA-2 and GATA-3 and the absence of GATA-1 in HUVECs.22 As shown in Figure 1Up, GATA-6 mRNA was detected in addition to mRNA of GATA-2 and GATA-3. GATA-4 mRNA could not be detected in HUVECs, in spite of the fact that it was detected in the mouse heart (data not shown). We also failed to detect GATA-5 mRNA in HUVECs. On TNF-{alpha} stimulation, GATA-6 mRNA was increased. In contrast, the mRNA expression of GATA-3 declined. The mRNA expression of GATA-2 showed only a slight increase. These results indicate that GATA-2, GATA-3, and GATA-6 are present in human endothelial cells and that each GATA factor exhibits a different response to TNF-{alpha} stimulation at the mRNA expression level.

Binding of GATA Proteins to the VCAM-1 Gene Upstream Promoter Region
We examined the binding of nuclear proteins, prepared from unstimulated or TNF-{alpha}–stimulated HUVECs, to the 2 adjacent putative GATA binding sequences located in the VCAM-1 gene upstream promoter region (online FigureUp I) by EMSA. The binding specificity to the GATA sequence was determined by using GATA sequence-mutated oligonucleotides as a 32P-labeled probe. Specific binding to the single GATA site was exhibited only by the 5'-GATA sequence in unstimulated and TNF-{alpha}–stimulated HUVECs (Figure 2ADown). In a competition assay using 32P-labeled probes from the original sequence (org in Figure 2BDown and 2CDown) with unlabeled GATA mutant oligonucleotides, the sequences containing the 5'-GATA sequence (5G and org in Figure 2BDown and 2CDown) diminished DNA binding, which confirmed the importance of the 5'-GATA sequence for this activity. However, 3G, which contains the original 3'-GATA sequence and the mutated 5'-GATA sequence, did show an inhibitory effect on the binding to the original sequence (org), indicating that the 3'-GATA sequence is also used for the binding of nuclear proteins in the presence of the binding to the 5'-GATA sequence. Mutant oligonucleotides both of the 5'- and 3'-GATA sequences (DM in Figure 2BDown and 2CDown) did not compete for the DNA binding of HUVEC nuclear proteins, indicating that there are no other sequences to which nuclear proteins bind in the probe sequence. No change was observed between the unstimulated and the TNF-{alpha}–stimulated HUVECs in the competitive binding patterns either by the 5'- or 3'-GATA mutant oligonucleotides. These results indicate that the 5'-GATA sequence is the main sequence used for DNA binding, and the binding to the 3'-GATA sequence is shown only when the 5'-GATA sequence is also in use.



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Figure 2. Binding of HUVEC nuclear proteins to the GATA sequences in the VCAM-1 gene upstream promoter region. A, EMSA was performed with nuclear extract from unstimulated or TNF-{alpha}–stimulated HUVECs with use of the following sequences as 32P-labeled probes: 5G, sequence changed the 3'-GATA sequence to TCGA; 3G, sequence changed the 5'-GATA sequence to TCGA. B and C, Competition assay performed with original GATA sequence (org) as a 32P-labeled probe. The nuclear extract from unstimulated (B) or TNF-{alpha}–stimulated (C) HUVECs was used. The binding reaction was performed in the presence of the unlabeled DNA fragments. DM indicates sequence in which 5'- and 3'-GATA sequences were changed to TCGA; p, 32P-labeled probe without sample; and ns, competition with unlabeled nonspecific oligonucleotide. The positions of the specific DNA-protein complex are indicated by arrows. Representative results from 3 independent experiments are shown.

GATA Proteins Involved in the Binding to the VCAM-1 Gene Upstream Promoter Region
To identify the GATA proteins involved in the binding to the VCAM-1 gene upstream promoter region, we used specific antibodies against GATA-2, GATA-3, and GATA-6. EMSA indicated that the antibodies against GATA-2, GATA-3, and GATA-6 produced supershifted bands of the GATA oligonucleotide (Figure 3Down, arrowheads). The total amount of the binding proteins, when the lanes were applied with the same amount of nuclear extract from HUVECs, was slightly increased in response to TNF-{alpha} stimulation, and different patterns of the shifted bands were observed between the unstimulated cells and the TNF-{alpha}–stimulated cells. In unstimulated cells, mainly GATA-2 and GATA-3 participated in the binding to the GATA motif in the upstream promoter region of VCAM-1 gene. In contrast, GATA-2 and GATA-6 participated in the DNA binding in TNF-{alpha}–stimulated HUVECs. These results show that the DNA-binding profiles of GATA members change in response to TNF-{alpha} stimulation.



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Figure 3. Members of GATA proteins involved in the binding to the GATA motif in the upstream promoter region of VCAM-1 gene. EMSA was performed with nuclear extract from unstimulated or TNF-{alpha}–stimulated HUVECs. The positions of the specific DNA-protein complex and the supershifted bands shown by antibodies specific for each GATA protein are indicated with an arrow and arrowheads, respectively. sp indicates competition with an unlabeled oligonucleotide of original sequence. A representative result from >3 independent experiments is shown.

Role of GATA Proteins in the VCAM-1 Expression Induced by TNF-{alpha}
To test whether the increase of GATA-6 and the decrease of GATA-3 mRNA expression on TNF-{alpha} stimulation are related to the VCAM-1 induction brought about by TNF-{alpha}, the GATA-2, GATA-3, or GATA-6 protein was overexpressed in HUVECs, and the expression of the VCAM-1 protein was studied by flow cytometry. As shown in Figure 4Down, a steady-state expression of VCAM-1 was not observed, but in response to TNF-{alpha} stimulation, expression was markedly increased. Enhanced expression of GATA-2 and GATA-6 significantly (P<0.05 for GATA-2 and P<0.01 for GATA-6) increased the VCAM-1 induction by TNF-{alpha}. In contrast, overexpression of GATA-3 resulted in a significant suppression (P<0.05) of VCAM-1 induction. Because overexpression of neither GATA-2, GATA-3, nor GATA-6 protein altered the induction of another cell adhesion molecule, ICAM-1, which has no GATA motif in its gene-regulatory region (FigureUp II, which can be accessed online at http://atvb.ahajournals.org), these effects of GATA proteins can be seen to be VCAM-1 specific.



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Figure 4. Effects of overexpression of GATA factors on the VCAM-1 expression induced by TNF-{alpha}. The expression vector of GATA-2, GATA-3, or GATA-6 was transfected to HUVECs. Vector indicates the expression vector without cDNA insert. The cells were stimulated by TNF-{alpha}, and the cell surface expression was analyzed by using anti–VCAM-1 antibody by flow cytometry. Data are expressed as percentage of control (no transfectant with TNF-{alpha} stimulation) expression and represent mean±SEM of 4 to 8 separate experiments. *P<0.05 and **P<0.01 vs vector.

Suppression of VCAM-1 Expression by Antisense Oligonucleotides to GATA Factors
To confirm the importance of GATA proteins for VCAM-1 gene induction, antisense oligonucleotides to GATA-2, GATA-3, and GATA-6 were examined. Almost all cells incorporated oligonucleotides at a concentration of 3 µg/mL by antisense oligonucleotide transfection (FigureUp III, which can be accessed online at http://atvb.ahajournals.org). Under these conditions, the GATA-6 antisense oligonucleotide exhibited the strongest dose-dependent inhibitory effect on the VCAM-1 expression induced by TNF-{alpha} (TableDown). Antisense oligonucleotide to GATA-2 also inhibited the VCAM-1 induction by TNF-{alpha} significantly in the 3 µg/mL–treated group (P<0.01), but the suppression by antisense oligonucleotide to GATA-3 was weak, and no dose dependence was observed. Again, none of these oligonucleotides changed the ICAM-1 induction by TNF-{alpha} (TableDown).


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Table 1. Effect of Antisense Oligonucleotides to GATA Factors on VCAM-1 and ICAM-1 Expression


*    Discussion
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*Discussion
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In the present study, we have shown the involvement of multiple GATA proteins in the regulation of cytokine-mediated VCAM-1 induction in human endothelial cells. GATA proteins have been divided into 2 subgroups on the basis of their tissue distribution, ie, GATA-1, -2, and -3, which are found in hematopoietic cells, and GATA-4, -5, and -6, which are expressed in the heart and gut.10 11 GATA proteins are thought to be crucial for many endothelial genes expressed in endothelial cell–specific function, including VCAM-1, P-selectin, platelet and endothelial cell adhesion molecule-1, endothelial NO synthase, and von Willebrand factor.13 23 24 25 26 Although human GATA-2 was cloned as a binding protein to the preproendothelin-1 gene promoter GATA sequence in HUVECs,22 27 little has been demonstrated about the precise role of GATA family proteins in endothelial cells. Northern blot analysis has revealed that 3 GATA family proteins (GATA-2, GATA-3, and GATA-6) are active in HUVECs (Figure 1Up) and has indicated GATA factor coexpression patterns among the subgroups in endothelial cells. In addition, TNF-{alpha} stimulation resulted in an increase of the GATA-6 and a decrease of the GATA-3 mRNA expression level. Certain cytokines, such as insulin-like growth factor-1, erythropoietin, or interleukin-2, have been reported to be capable of inducing the expression of GATA proteins,21 28 29 and the present study reveals that TNF-{alpha} also regulates the mRNA expression of the GATA factors.

The GATA sequences located in the upstream promoter region of VCAM-1 gene are arranged as a palindromic GATA motif, to which GATA factors can stably bind with their 2-finger domains.30 In the case of the GATA-binding motif in the upstream promoter region of VCAM-1 gene, the 5'-GATA sequence was primarily used for the DNA binding (Figure 2Up). Competition assay showed that the 3'-GATA sequence is a possible binding site in the event that the 5'-GATA sequence is occupied by other factors. Specific antibodies against GATA proteins in supershift assay indicated that GATA-2, GATA-3, and GATA-6 participate in the binding to the VCAM-1 gene GATA motif (Figure 3Up). Furthermore, on TNF-{alpha} stimulation, binding profiles distinct from those in unstimulated cells emerged. The increased amount of anti-GATA antibodies diminished the original band and the supershifted band as well (data not shown). Because we used polyclonal antibodies for the supershift assay, it is possible that a part of the antibodies used for the assay inhibits the DNA binding of GATA proteins. The usage of neither the 5'-GATA nor the 3'-GATA sequence was altered by TNF-{alpha} stimulation (Figure 2Up). Thus, the change in the members of GATA proteins in their binding motif as shown by supershift assay is thought to result from the displacement of GATA proteins.

Enhanced expression of GATA-2 or GATA-6 resulted in the augmentation of VCAM-1 induction, whereas that of GATA-3 resulted in a suppression of TNF-{alpha}–induced VCAM-1 (Figure 4Up). Experiments using antisense oligonucleotides confirmed the importance of GATA-2 and GATA-6 for the VCAM-1 induction in endothelial cells. Antisense oligonucleotides either to GATA-2 or GATA-6 inhibited the VCAM-1 induction by TNF-{alpha} (TableUp). Antisense oligonucleotides to GATA-3 also exhibited a weak inhibition, but the inhibitory effect was not dose dependent. Thus, the effect obtained by GATA-3 antisense oligonucleotides is considered to be nonspecific.

It has been shown that GATA-1 and GATA-2 have a positive and negative regulatory role, respectively, in eosinophil granule major basic protein gene transcription and that GATA-1 and GATA-2 can bind to the same promoter GATA sequence competitively.17 It is also known that there are differences in the binding affinity for the recognition sequences among the GATA proteins, which suggests the possibility of different roles for different GATA proteins in the transcription of target genes.9 31 The present study suggests that GATA-2 and GATA-6 positively regulate VCAM-1 gene transactivation and also shows that the member switching from GATA-2/GATA-3 to GATA-2/GATA-6 is related to the functional regulation of VCAM-1 induction by TNF-{alpha}. This interpretation fits with our result that there was no apparent increase observed in the total amount of binding to the GATA motif between the unstimulated and the TNF-{alpha}–stimulated cells compared with the marked augmentation of VCAM-1 expression by TNF-{alpha}.

The role of GATA-2 in the regulation of VCAM-1 induction still remains unclear. There are 2 possibilities for the role of GATA-2 in the VCAM-1 induction. One possibility is that GATA-2 forms a homodimer or a heterodimer complex with other GATA factors. The formation of a homodimer or a heterodimer among GATA factors has been reported.32 33 In cardiac tissue, cooperative interaction between GATA-4 and GATA-6 regulates myocardial gene expression.33 GATA-2 may form a heterodimer with either GATA-3 or GATA-6, which leads to the regulation of VCAM-1 transactivation. The other possibility is that GATA-2 shares binding sites with GATA-3 or GATA-6. The EMSA results suggest 2 possible GATA binding sites in the VCAM-1 gene upstream promoter region. It is possible that GATA-2 and GATA-3 in unstimulated cells or GATA-2 and GATA-6 in TNF-{alpha}–stimulated cells use separate GATA sites for DNA binding.

The formation of transcription factor complexes in addition to phosphorylation and acetylation has been reported to be involved in the activating mechanisms of GATA family proteins.29 34 35 36 37 38 39 40 The complex formation among transcription factors may be related to the functional changes of GATA proteins in cytokine-stimulated endothelial cells. Furthermore, it is possible that there are differences between GATA-3 and GATA-6 in their ability to interact with other transcription factors, which is related to the VCAM-1 gene induction.

It is well accepted that the activation of NF-{kappa}B is important in the induction of VCAM-1. However, it is difficult to explain the cell-specific induction of certain molecules, such as VCAM-1, only by NF-{kappa}B activation, and it has been reported that full TNF-{alpha}–induced accumulation of the VCAM-1 transcript requires protein synthesis.6 Our results (ie, in unstimulated cells, overexpression of GATA-2 or GATA-6 did not induce the VCAM-1 expression; Figure 4Up) indicate the requirement of other factors in addition to GATA-2 and/or GATA-6 for the VCAM-1 expression induced by TNF-{alpha}. Thus, it is likely that each transcriptional activity of the factors, including GATA-3, GATA-6, and NF-{kappa}B, is independently controlled by various cytokines and that a combination of transcription factors involving these factors regulates the induction of the VCAM-1 gene. On the target genes of the GATA proteins, GATA may act as a requisite factor for the specific expression of certain endothelial functions, such as VCAM-1 induction. Further study into the interaction of the GATA proteins in cytokine-induced activation of VCAM-1 not only will provide important insights into the mechanisms of the induction of adhesion molecules but also will help to clarify the fundamental principles of highly specified transcriptional regulation.


*    Acknowledgments
 
This work was supported by a grant from R&D Projects in Cooperation with Academic Institutions. We thank Kevin Boru for reviewing the manuscript. We also thank Chizuru Nagao and Chisa Shimizu for expert technical assistance.

Received December 7, 2000; accepted February 13, 2001.


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up arrowMethods
up arrowResults
up arrowDiscussion
*References
 

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