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TGF-Β1 Signaling Targets Metastasis-Associated Protein 1, a New Effector in Epithelial Cells

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TGF-Β1 Signaling Targets Metastasis-Associated Protein 1, a New Effector in Epithelial Cells Oncogene (2011) 30, 2230–2241 & 2011 Macmillan Publishers Limited All rights reserved 0950-9232/11 www.nature.com/onc ORIGINAL ARTICLE TGF-b1 signaling targets metastasis-associated protein 1, a new effector in epithelial cells SB Pakala1, K Singh1,3, SDN Reddy1, K Ohshiro1, D-Q Li1, L Mishra2 and R Kumar1 1Department of Biochemistry and Molecular Biology and Institute of Coregulator Biology, The George Washington University Medical Center, Washington, DC, USA and 2Department of Gastroenterology, Hepatology and Nutrition, The University of Texas MD Anderson Cancer Center, Houston, TX, USA In spite of a large number of transforming growth factor b1 gene chromatin in response to upstream signals. The (TGF-b1)-regulated genes, the nature of its targets with TGF-b1-signaling is largely mediated by Smad proteins roles in transformation continues to be poorly understood. (Massague et al., 2005) where Smad2 and Smad3 are Here, we discovered that TGF-b1 stimulates transcription phosphorylated by TGF-b1-receptors and associate with of metastasis-associated protein 1 (MTA1), a dual master the common mediator Smad4, which translocates to the coregulator, in epithelial cells, and that MTA1 status is a nucleus to participate in the expression of TGF-b1-target determinant of TGF-b1-induced epithelial-to-mesenchymal genes (Deckers et al., 2006). Previous studies have shown transition (EMT) phenotypes. In addition, we found that that CUTL1, also known as CDP (CCAAT displacement MTA1/polymerase II/activator protein-1 (AP-1) co-activator protein), a target of TGF-b1, is needed for its short-term complex interacts with the FosB-gene chromatin and stimu- effects of TGF-b1 on cell motility involving Smad4- lates its transcription, and FosB in turn, utilizes FosB/histone dependent pathway (Michl et al.,2005). deacetylase 2 complex to repress E-cadherin expression in In addition to TGF-b1-signaling, the process of breast TGF-b1-stimulated mammary epithelial cells. These find- cancer progression is profoundly influenced by the levels ings suggest that TGF-b1 regulates the components of EMT of metastasis-associated protein 1 (MTA1), an integral via stimulating the expression of MTA1, which in turn, role in nucleosome remodeling and histone deacetylation induces FosB to repress E-cadherin expression and thus, complex (Manavathi and Kumar, 2007). The MTA1 revealed an inherent function of MTA1 as a target and regulates the transcriptional outcome of its targets effector of TGF-b1 signaling in epithelial cells. because of its ability to modify the acetylation status on Oncogene (2011) 30, 2230–2241; doi:10.1038/onc.2010.608; the target gene chromatin and thus, controlling accessi- published online 24 January 2011 bility of various coregulators to DNA (Gururaj et al., 2006). In addition of its interaction with histone deacety- Keywords: TGF-b1 signaling; MTA1; FosB; target gene lases (HDACs) and nucleosome remodeling and histone transcription; epithelial-to-mesenchymal transition deacetylation complex, it functions as a corepressor on its targets (Mazumdar et al., 2001; Molli et al., 2008), where as MTA1 also interacts with RNA polymerase II (Pol II) Introduction and acts as a co-activator on some targets (Gururaj et al., 2006; Balasenthil et al., 2007). Earlier studies from this and Inappropriate transforming growth factor b1 (TGF-b1)- other laboratories have shown that increased MTA1 signaling has been linked with dedifferentiation, epithe- expression in murine mammary epithelial or tumor cells lial–mesenchymal transition (EMT) and tumor progres- is associated with not only increased invasiveness but also sion (Condeelis and Segall, 2003; Peinado et al., 2003). a reduced expression of E-cadherin, a hallmark of EMT During EMT, epithelial cells lose their polarity and repress (Zhang et al., 2006; Tong et al., 2007; Dannenmann et al., E-cadherin but express mesenchymal markers such as 2008). However, in spite of an inverse correlation in the vimentin and a-smooth muscle actin (a-SMA) (Thiery, levels of MTA1 and E-cadherin in tumor cells, it remains 2002; Radisky, 2005; Zavadil and Bottinger, 2005; Hugo unknown whether TGF-b1-signaling, a known modifier of et al., 2007). The process of cancer progression involves E-cadherin expression and EMT, require MTA1. Here, we a rapid modulation of TGF-b1-responsive genes with examined the role of MTA1 in TGF-b1-signaling and roles in EMT and metastasis via remodeling of target discovered that MTA1 is a target and an essential modifier of TGF-b1-signaling in epithelial cells. Correspondence: Professor R Kumar, Department of Biochemistry and Molecular Biology and Institute of Coregulator Biology, The George Washington University Medical Center, Washington, DC Results 20037, USA. E-mail: [email protected] MTA1 is required for TGF-b1-signaling in epithelial cells 3Current address: Department of Cancer Biology, Cleveland Clinic Lerner Research Institute, Cleveland, OH 44195, USA. In spite of a widespread upregulation of MTA1 in breast Received 3 October 2010; revised 17 November 2010; accepted 4 cancer and metastasis, it remains unknown whether December 2010; published online 24 January 2011 MTA1 has any role in EMT, a prerequisite for tumor MTA1, a new effector of TGF-b1 signaling SB Pakala et al 2231 metastasis. Hence, we wished to investigate whether and CEBPa (CAAT enhancer-binding protein) inhibits MTA1 has a role in TGF-b1-induced EMT using HC11 TGFb1 signaling (Lee et al., 1994; MacLellan et al., cells as a model system. HC11 cells are mammary 1994; Kurisaki et al., 2003; Gery et al., 2005). As TGF- epithelial cells with polygonal morphology while TGF- b1 signaling stimulates (and not inhibits) MTA1 b1 stimulates its trans-differentiation into mesenchymal transcription, we choose to concentrate on CDP in the phenotype with an elongated morphology (Figure 1a) subsequent studies. (Radisky, 2005). We found that MTA1-depletion by The presence of seven consensus motifs for CDP on selective small interfering RNA (siRNA) compromises the MTA1 promoter provided clues that MTA1 might the ability of TGF-b1 to induce elongated morphology be regulated by TGF-b1-responsive transcription fac- in HC11 cells (Figure 1b). In parallel, MTA1-knock- tors. We found that transient expression of CDP alone is down also suppressed the effect of TGF-b1 to upregu- sufficient to induce MTA1 promoter activity (Figure 2e), late a-SMA (Figure 1c) and to downregulate epithelial suggesting that TGF-b1 may indeed, utilize CDP to marker E-cadherin (Figure 1c). Furthermore, HC11 stimulate MTA1 transcription (Supplementary Figure cells stably overexpressing MTA1 exhibited a distinct S2a). To validate this finding, we next examined the mesenchymal morphology (Figure 1d) as well as impact of CDP-knockdown on the ability of TGF-b1to downregulation of E-cadherin (Figure 1e). MTA1 over- stimulate MTA1 transcription. We found that CDP- expression or knockdown in the NMuMG primary depletion prevents TGF-b1 stimulation of MTA1 mammary cells also modulated the levels of E-cadherin promoter activity (Figure 2f). As expected, TGF-b1 and a-SMA (Figures 1f and g). These findings suggested stimulates the expression of CDP and a-SMA. Interest- that MTA1 is a modifier of TGF-b1-signaling and its net ingly, CDP-knockdown also abolished the stimulation levels affect EMT. of the endogenous MTA1 and a-SMA by TGF-b1 (Figure 2g). As Smad4-dependent signaling is involved TGF-b1-signaling induces MTA1 expression through CDP in the transcriptional regulation of CDP (Michl et al., During the course of preceding studies, we consistently 2005), we next examined the effect of Smad4-knock- noticed that TGF-b1-stimulation of cells accompanies down on MTA1 transcription. We found that Smad4- with an increased expression of MTA1 protein (Figures 1c depletion prevents the ability of TGF-b1 stimulation of and f), raising the hypothesis that MTA1 might be MTA1 transcription (Figure 2h). These results suggest a regulated by TGF-b1-signaling. To test this notion, we mechanistic role of CDP in TGF-b1 stimulation of next treated HC11 cells with TGF-b1 and showed that MTA1 transcription. indeed, TGF-b1 stimulates the level of MTA1 protein To gain a deeper insight into the molecular mechan- and mRNA (Figures 2a and b) and represses the ism involved in CDP regulation of MTA1 stimulation, expression of E-cadherin protein (Figure 2a) and that we next mapped the recruitment of CDP to MTA1 transcriptional inhibitor actinomycin D substantially promoter by chromatin immunoprecipitation (ChIP). reduces the levels of TGF-b1-inducible MTA1 mRNA CDP was recruited to regions II, IV, V and VI of the and protein (Figures 2b and c). These findings suggested MTA1 promoter (Figure 3a). Interestingly, CDP inter- that MTA1 may be a target of TGF-b1. action at these regions was further increased on TGF-b1 MTA1 gene resides on chromosome 14q32.3 locus in treatment. To further characterize the responsive active human and chromosome 12f1 locus in mouse. To study sites on MTA1 promoter, we determined the status of the TGF-b1 regulation of MTA1 transcription, we acetylated histone H4 at all these regions. We found that cloned the 5 kb promoter region of mouse MTA1 and TGF-b1 stimulation leads to recruitment of acetylated generated a series of promoter-luc reporter systems histone H4 at region IV and VI, suggesting that these (Supplementary Figure S1a). The MTA1 region of could be the functional regions in vivo (Figure 3b). On À5200 to À2872-bp upstream to the first codon ATG the other hand, there was no recruitment of acetylated showed the maximum potential for promoter-like histone H3 onto MTA1 promoter in TGF-b1-stimulated sequence. Both the minimal and full-length MTA1 cells (Supplementary Figure S2b). Sequential double- promoter was equally responded to TGF-b1 stimulation ChIP analysis involving CDP followed by acetylated H4 (Figure 2d and Supplementary Figure S1a). antibodies indicated that CDP and acetyl histone H4 As MTA1 is involved in promoting tumor invasive- are co-recruited only to region VI of MTA1 promoter ness and motility (Mahoney et al., 2002; Hofer et al., (Figure 3c).
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