1
|
Lin M, Zheng X, Yan J, Huang F, Chen Y, Ding R, Wan J, Zhang L, Wang C, Pan J, Cao X, Fu K, Lou Y, Feng XH, Ji J, Zhao B, Lan F, Shen L, He X, Qiu Y, Jin J. The RNF214-TEAD-YAP signaling axis promotes hepatocellular carcinoma progression via TEAD ubiquitylation. Nat Commun 2024; 15:4995. [PMID: 38862474 PMCID: PMC11167002 DOI: 10.1038/s41467-024-49045-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2023] [Accepted: 05/22/2024] [Indexed: 06/13/2024] Open
Abstract
RNF214 is an understudied ubiquitin ligase with little knowledge of its biological functions or protein substrates. Here we show that the TEAD transcription factors in the Hippo pathway are substrates of RNF214. RNF214 induces non-proteolytic ubiquitylation at a conserved lysine residue of TEADs, enhances interactions between TEADs and YAP, and promotes transactivation of the downstream genes of the Hippo signaling. Moreover, YAP and TAZ could bind polyubiquitin chains, implying the underlying mechanisms by which RNF214 regulates the Hippo pathway. Furthermore, RNF214 is overexpressed in hepatocellular carcinoma (HCC) and inversely correlates with differentiation status and patient survival. Consistently, RNF214 promotes tumor cell proliferation, migration, and invasion, and HCC tumorigenesis in mice. Collectively, our data reveal RNF214 as a critical component in the Hippo pathway by forming a signaling axis of RNF214-TEAD-YAP and suggest that RNF214 is an oncogene of HCC and could be a potential drug target of HCC therapy.
Collapse
Affiliation(s)
- Mengjia Lin
- State Key Laboratory for Diagnosis and Treatment of Infectious Disease, and National Clinical Research Center for Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, 310000, Zhejiang, China
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Xiaoyun Zheng
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, Zhejiang, China
- Cancer Center, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Jianing Yan
- Department of General Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, 310016, Zhejiang, China
| | - Fei Huang
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Yilin Chen
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, Zhejiang, China
- Cancer Center, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Ran Ding
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, Zhejiang, China
- Cancer Center, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Jinkai Wan
- International Co-laboratory of Medical Epigenetics and Metabolism of Ministry of Science and Technology, and Shanghai Key Laboratory of Medical Epigenetics, Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, China
- Key Laboratory of Carcinogenesis and Cancer Invasion of Ministry of Education, and Liver Cancer Institute, Zhongshan Hospital, Fudan University, Shanghai, 200032, China
| | - Lei Zhang
- International Co-laboratory of Medical Epigenetics and Metabolism of Ministry of Science and Technology, and Shanghai Key Laboratory of Medical Epigenetics, Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, China
| | - Chenliang Wang
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Jinchang Pan
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Xiaolei Cao
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, Zhejiang, China
- Cancer Center, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Kaiyi Fu
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Yan Lou
- Zhejiang Provincial Key Laboratory for Drug Clinical Research and Evaluation, Department of Clinical Pharmacy, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, 310000, Zhejiang, China
| | - Xin-Hua Feng
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, Zhejiang, China
- Cancer Center, Zhejiang University, Hangzhou, 310058, Zhejiang, China
- Center for Life Sciences, Shaoxing Institute, Zhejiang University, Shaoxing, 321000, China
| | - Junfang Ji
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, Zhejiang, China
- Cancer Center, Zhejiang University, Hangzhou, 310058, Zhejiang, China
- Center for Life Sciences, Shaoxing Institute, Zhejiang University, Shaoxing, 321000, China
| | - Bin Zhao
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, Zhejiang, China
- Cancer Center, Zhejiang University, Hangzhou, 310058, Zhejiang, China
- Center for Life Sciences, Shaoxing Institute, Zhejiang University, Shaoxing, 321000, China
| | - Fei Lan
- International Co-laboratory of Medical Epigenetics and Metabolism of Ministry of Science and Technology, and Shanghai Key Laboratory of Medical Epigenetics, Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, China
- Key Laboratory of Carcinogenesis and Cancer Invasion of Ministry of Education, and Liver Cancer Institute, Zhongshan Hospital, Fudan University, Shanghai, 200032, China
| | - Li Shen
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, Zhejiang, China
- Department of Orthopedics Surgery, School of Medicine, The Second Affiliated Hospital, Zhejiang University, Hangzhou, 310009, Zhejiang, China
| | - Xianglei He
- Department of Pathology, Zhejiang Provincial People's Hospital, Hangzhou, 3100014, Zhejiang, China
| | - Yunqing Qiu
- State Key Laboratory for Diagnosis and Treatment of Infectious Disease, and National Clinical Research Center for Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, 310000, Zhejiang, China.
- Zhejiang Provincial Key Laboratory for Drug Clinical Research and Evaluation, Department of Clinical Pharmacy, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, 310000, Zhejiang, China.
| | - Jianping Jin
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, Zhejiang, China.
- Cancer Center, Zhejiang University, Hangzhou, 310058, Zhejiang, China.
- Zhejiang Provincial Key Laboratory for Drug Clinical Research and Evaluation, Department of Clinical Pharmacy, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, 310000, Zhejiang, China.
- Center for Life Sciences, Shaoxing Institute, Zhejiang University, Shaoxing, 321000, China.
| |
Collapse
|
2
|
Isaac R, Bandyopadhyay G, Rohm TV, Kang S, Wang J, Pokhrel N, Sakane S, Zapata R, Libster AM, Vinik Y, Berhan A, Kisseleva T, Borok Z, Zick Y, Telese F, Webster NJG, Olefsky JM. TM7SF3 controls TEAD1 splicing to prevent MASH-induced liver fibrosis. Cell Metab 2024; 36:1030-1043.e7. [PMID: 38670107 PMCID: PMC11113091 DOI: 10.1016/j.cmet.2024.04.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 02/29/2024] [Accepted: 04/04/2024] [Indexed: 04/28/2024]
Abstract
The mechanisms of hepatic stellate cell (HSC) activation and the development of liver fibrosis are not fully understood. Here, we show that deletion of a nuclear seven transmembrane protein, TM7SF3, accelerates HSC activation in liver organoids, primary human HSCs, and in vivo in metabolic-dysfunction-associated steatohepatitis (MASH) mice, leading to activation of the fibrogenic program and HSC proliferation. Thus, TM7SF3 knockdown promotes alternative splicing of the Hippo pathway transcription factor, TEAD1, by inhibiting the splicing factor heterogeneous nuclear ribonucleoprotein U (hnRNPU). This results in the exclusion of the inhibitory exon 5, generating a more active form of TEAD1 and triggering HSC activation. Furthermore, inhibiting TEAD1 alternative splicing with a specific antisense oligomer (ASO) deactivates HSCs in vitro and reduces MASH diet-induced liver fibrosis. In conclusion, by inhibiting TEAD1 alternative splicing, TM7SF3 plays a pivotal role in mitigating HSC activation and the progression of MASH-related fibrosis.
Collapse
Affiliation(s)
- Roi Isaac
- Division of Endocrinology & Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Gautam Bandyopadhyay
- Division of Endocrinology & Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Theresa V Rohm
- Division of Endocrinology & Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Sion Kang
- Division of Endocrinology & Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Jinyue Wang
- Division of Endocrinology & Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Narayan Pokhrel
- Department of Psychiatry, University of California San Diego, La Jolla, CA 92093, USA
| | - Sadatsugu Sakane
- Division of Endocrinology & Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA; Department of Surgery, University of California San Diego, School of Medicine, La Jolla, CA 92093, USA
| | - Rizaldy Zapata
- Division of Endocrinology & Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Avraham M Libster
- Department of Psychiatry, University of California San Diego, La Jolla, CA 92093, USA
| | - Yaron Vinik
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Asres Berhan
- Division of Pulmonary, Critical Care, Sleep Medicine and Physiology, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Tatiana Kisseleva
- Department of Surgery, University of California San Diego, School of Medicine, La Jolla, CA 92093, USA
| | - Zea Borok
- Division of Pulmonary, Critical Care, Sleep Medicine and Physiology, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Yehiel Zick
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Francesca Telese
- Department of Psychiatry, University of California San Diego, La Jolla, CA 92093, USA
| | - Nicholas J G Webster
- Division of Endocrinology & Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA; VA San Diego Healthcare System, San Diego, CA, USA
| | - Jerrold M Olefsky
- Division of Endocrinology & Metabolism, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA.
| |
Collapse
|
3
|
Wu M, Hu L, He L, Yuan L, Yang L, Zhao B, Zhang L, He X. The tumor suppressor NF2 modulates TEAD4 stability and activity in Hippo signaling via direct interaction. J Biol Chem 2024; 300:107212. [PMID: 38522513 PMCID: PMC11046300 DOI: 10.1016/j.jbc.2024.107212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 02/10/2024] [Accepted: 03/12/2024] [Indexed: 03/26/2024] Open
Abstract
As an output effector of the Hippo signaling pathway, the TEAD transcription factor and co-activator YAP play crucial functions in promoting cell proliferation and organ size. The tumor suppressor NF2 has been shown to activate LATS1/2 kinases and interplay with the Hippo pathway to suppress the YAP-TEAD complex. However, whether and how NF2 could directly regulate TEAD remains unknown. We identified a direct link and physical interaction between NF2 and TEAD4. NF2 interacted with TEAD4 through its FERM domain and C-terminal tail and decreased the protein stability of TEAD4 independently of LATS1/2 and YAP. Furthermore, NF2 inhibited TEAD4 palmitoylation and induced the cytoplasmic translocation of TEAD4, resulting in ubiquitination and dysfunction of TEAD4. Moreover, the interaction with TEAD4 is required for NF2 function to suppress cell proliferation. These findings reveal an unanticipated role of NF2 as a binding partner and inhibitor of the transcription factor TEAD, shedding light on an alternative mechanism of how NF2 functions as a tumor suppressor through the Hippo signaling cascade.
Collapse
Affiliation(s)
- Mengying Wu
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, China
| | - Liqiao Hu
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, China.
| | - Lingli He
- State Key Laboratory of Cell Biology, Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai, China
| | - Liang Yuan
- College of Life Science and Technology, ShanghaiTech University, Shanghai, China
| | - Lingling Yang
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, China
| | - Bin Zhao
- The MOE Key Laboratory of Biosystems Homeostasis and Protection and Innovation Center for Cell Signaling Network, Life Sciences Institute, Zhejiang University, Hangzhou, Zhejiang, China; Cancer Center, Zhejiang University, Hangzhou, Zhejiang, China
| | - Lei Zhang
- State Key Laboratory of Cell Biology, Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai, China; College of Life Science and Technology, ShanghaiTech University, Shanghai, China; School of Life Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Hangzhou, China
| | - Xiaojing He
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, China.
| |
Collapse
|
4
|
Guo X, Wu C, Pan Y, Zhu X, Peng K, Ma X, Xue L. Mechanistic insights and implications of FOXO-SNAI interplay. Bioessays 2022; 44:e2200070. [PMID: 35832016 DOI: 10.1002/bies.202200070] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 06/29/2021] [Accepted: 07/05/2022] [Indexed: 11/06/2022]
Abstract
Autophagy promotes both health and disease, depending on tissue types and genetic contexts, yet the regulatory mechanism remain incompletely understood. Our recent publication has uncovered a coherent FOXO-SNAI feed-forward loop in autophagy, which is evolutionarily conserved from Drosophila to human. In addition, it's revealed that DNA binding plays a critical role in intracellular localization of nucleocytoplasmic shuttling proteins. Based on these findings, herein we further integrate mechanistic insights of FOXO-SNAI regulatory interplay in autophagy and unravel the potential link of FOXO-induced autophagy with SNAI in diseases. Besides, the generality of DNA-retention mechanism on transcription factor nuclear localization is illustrated with wide-ranging discussion, and more functions potentially regulated by FOXO-SNAI feedforward loop are provided. Elucidation of these unsolved paradigms will expand the understanding of FOXO-SNAI interplay and facilitate the development of new therapeutics targeting FOXO-SNAI axis in diseases.
Collapse
Affiliation(s)
- Xiaowei Guo
- School of Medicine, Hunan Normal University, Changsha, Hunan, China.,Institute of Intervention Vessel, Shanghai 10th People's Hospital, School of Life Science and Technology, Tongji University, Shanghai, China
| | - Chenxi Wu
- College of Traditional Chinese Medicine, North China University of Science and Technology, Tangshan, Hebei, China
| | - Yu Pan
- Institute of Intervention Vessel, Shanghai 10th People's Hospital, School of Life Science and Technology, Tongji University, Shanghai, China
| | - Xiaojie Zhu
- Institute of Intervention Vessel, Shanghai 10th People's Hospital, School of Life Science and Technology, Tongji University, Shanghai, China
| | - Kai Peng
- Institute of Intervention Vessel, Shanghai 10th People's Hospital, School of Life Science and Technology, Tongji University, Shanghai, China
| | - Xianjue Ma
- School of Life Sciences, Westlake University, Hangzhou, Zhejiang, China
| | - Lei Xue
- Institute of Intervention Vessel, Shanghai 10th People's Hospital, School of Life Science and Technology, Tongji University, Shanghai, China.,Zhuhai Precision Medical Center, Zhuhai People's Hospital, Zhuhai Hospital Affiliated with Jinan University, Zhuhai, Guangdong, China
| |
Collapse
|
5
|
Choi S, Lee HS, Cho N, Kim I, Cheon S, Park C, Kim EM, Kim W, Kim KK. RBFOX2-regulated TEAD1 alternative splicing plays a pivotal role in Hippo-YAP signaling. Nucleic Acids Res 2022; 50:8658-8673. [PMID: 35699208 PMCID: PMC9410899 DOI: 10.1093/nar/gkac509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 05/25/2022] [Accepted: 05/30/2022] [Indexed: 11/14/2022] Open
Abstract
Alternative pre-mRNA splicing is key to proteome diversity; however, the biological roles of alternative splicing (AS) in signaling pathways remain elusive. Here, we focus on TEA domain transcription factor 1 (TEAD1), a YAP binding factor in the Hippo signaling pathway. Public database analyses showed that expression of YAP-TEAD target genes negatively correlated with the expression of a TEAD1 isoform lacking exon 6 (TEAD1ΔE6) but did not correlate with overall TEAD1 expression. We confirmed that the transcriptional activity and oncogenic properties of the full-length TEAD1 isoform were greater than those of TEAD1ΔE6, with the difference in transcription related to YAP interaction. Furthermore, we showed that RNA-binding Fox-1 homolog 2 (RBFOX2) promoted the inclusion of TEAD1 exon 6 via binding to the conserved GCAUG element in the downstream intron. These results suggest a regulatory mechanism of RBFOX2-mediated TEAD1 AS and provide insight into AS-specific modulation of signaling pathways.
Collapse
Affiliation(s)
- Sunkyung Choi
- Department of Biochemistry, College of Natural Sciences, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Hyo Seong Lee
- Department of Biochemistry, College of Natural Sciences, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Namjoon Cho
- Department of Biochemistry, College of Natural Sciences, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Inyoung Kim
- Department of Biochemistry, College of Natural Sciences, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Seongmin Cheon
- School of Biological Sciences and Technology, Chonnam National University, Gwangju 61186, Republic of Korea.,Proteomics Core Facility, Biomedical Research Institute, Seoul National University Hospital, Seoul 03080, Republic of Korea
| | - Chungoo Park
- School of Biological Sciences and Technology, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Eun-Mi Kim
- Department of Predictive Toxicology, Korea Institute of Toxicology, Daejeon, 34114, Republic of Korea
| | - Wantae Kim
- Department of Biochemistry, College of Natural Sciences, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Kee K Kim
- Department of Biochemistry, College of Natural Sciences, Chungnam National University, Daejeon 34134, Republic of Korea
| |
Collapse
|
6
|
Currey L, Thor S, Piper M. TEAD family transcription factors in development and disease. Development 2021; 148:269158. [PMID: 34128986 DOI: 10.1242/dev.196675] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The balance between stem cell potency and lineage specification entails the integration of both extrinsic and intrinsic cues, which ultimately influence gene expression through the activity of transcription factors. One example of this is provided by the Hippo signalling pathway, which plays a central role in regulating organ size during development. Hippo pathway activity is mediated by the transcriptional co-factors Yes-associated protein (YAP) and transcriptional co-activator with PDZ-binding motif (TAZ), which interact with TEA domain (TEAD) proteins to regulate gene expression. Although the roles of YAP and TAZ have been intensively studied, the roles played by TEAD proteins are less well understood. Recent studies have begun to address this, revealing that TEADs regulate the balance between progenitor self-renewal and differentiation throughout various stages of development. Furthermore, it is becoming apparent that TEAD proteins interact with other co-factors that influence stem cell biology. This Primer provides an overview of the role of TEAD proteins during development, focusing on their role in Hippo signalling as well as within other developmental, homeostatic and disease contexts.
Collapse
Affiliation(s)
- Laura Currey
- The School of Biomedical Sciences, Queensland Brain Institute, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Stefan Thor
- The School of Biomedical Sciences, Queensland Brain Institute, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Michael Piper
- The School of Biomedical Sciences, Queensland Brain Institute, The University of Queensland, Brisbane, QLD 4072, Australia.,Queensland Brain Institute, The University of Queensland, Brisbane, QLD 4072, Australia
| |
Collapse
|
7
|
Gallego-Gutiérrez H, González-González L, Ramírez-Martínez L, López-Bayghen E, González-Mariscal L. Tight junction protein ZO-2 modulates the nuclear accumulation of transcription factor TEAD. Mol Biol Cell 2021; 32:1347-1358. [PMID: 34010016 PMCID: PMC8694039 DOI: 10.1091/mbc.e20-07-0470] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
The presence of tight junction protein zonula occludens 2 (ZO-2) at the nucleus inhibits the transcription of genes regulated by TEAD transcription factor. Here, we analyzed whether the movement of ZO-2 into the nucleus modulates the nuclear concentration of TEAD. In sparse cultures of ZO-2 knockdown Madin–Darby canine kidney cells, nuclear TEAD was diminished, as in parental cells transfected with a ZO-2 construct without nuclear localization signals, indicating that ZO-2 facilitates the entry of TEAD into the nucleus. Inhibition of nPKCδ in parental cells triggers the interaction between ZO-2 and TEAD at the cytoplasm and facilitates TEAD/ZO-2 complex nuclear importation. Using proximity ligation, immunoprecipitation, and pull-down assays, TEAD/ZO-2 interaction was confirmed. Nuclear TEAD is phosphorylated, and its exit in parental cells is enhanced by activation of a ZO-2 nuclear exportation signal by nPKCε, while the nuclear accumulation of ZO-2 triggered by the mutation of ZO-2 nuclear export signals induces no change in TEAD nuclear concentration. In summary, our results indicate that the movements of ZO-2 in and out of the nucleus modulate the intracellular traffic of TEAD through a process regulated by nPKCδ and ε and provide a novel role of ZO-2 as a nuclear translocator of TEAD.
Collapse
Affiliation(s)
| | | | - Leticia Ramírez-Martínez
- Department of Toxicology, Center for Research and Advanced Studies (Cinvestav), Mexico City 07360, Mexico
| | - Esther López-Bayghen
- Department of Toxicology, Center for Research and Advanced Studies (Cinvestav), Mexico City 07360, Mexico
| | | |
Collapse
|
8
|
Drexler R, Fahy R, Küchler M, Wagner KC, Reese T, Ehmke M, Feyerabend B, Kleine M, Oldhafer KJ. Association of subcellular localization of TEAD transcription factors with outcome and progression in pancreatic ductal adenocarcinoma. Pancreatology 2021; 21:170-179. [PMID: 33317954 DOI: 10.1016/j.pan.2020.12.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 11/25/2020] [Accepted: 12/01/2020] [Indexed: 12/11/2022]
Abstract
BACKGROUND Transcriptional enhanced associated domain (TEAD) transcription factors are nuclear effectors of several oncogenic signalling pathways including Hippo, WNT, TGF-ß and EGFR pathways that interact with various cancer genes. The subcellular localization of TEAD regulates the functional output of these pathways affecting tumour progression and patient outcome. However, the impact of the TEAD family on pancreatic ductal adenocarcinoma (PDAC) and its clinical progression remain elusive. METHODS A cohort of 81 PDAC patients who had undergone surgery was established. Cytoplasmic and nuclear localization of TEAD1, TEAD2, TEAD3 and TEAD4 was evaluated with the immunoreactive score (IRS) by immunohistochemistry (IHC) using paraffin-embedded tissue. Results were correlated with clinicopathological data, disease-free and overall survival. RESULTS Nuclear staining of all four TEADs was increased in pancreatic cancer tissue. Patients suffering from metastatic disease at time of surgery showed a strong nuclear staining of TEAD2 and TEAD3 (p < 0.05). Furthermore, a nuclear > cytoplasmic ratio of TEAD2 and TEAD3 was associated with a shorter overall survival and TEAD2 emerged as an independent prognostic factor for disease-free survival. CONCLUSION Our study underlines the importance of TEAD transcription factors in PDAC as a nuclear localization was found to be associated with metastatic disease and an unfavourable prognosis after surgical resection.
Collapse
Affiliation(s)
- Richard Drexler
- Asklepios Campus Hamburg, Semmelweis University Budapest, Hamburg, Germany; Department of Surgery, Division of HPB Surgery, Asklepios Hospital Barmbek, Hamburg, Germany.
| | - Rebecca Fahy
- Asklepios Campus Hamburg, Semmelweis University Budapest, Hamburg, Germany; Department of Surgery, Division of HPB Surgery, Asklepios Hospital Barmbek, Hamburg, Germany
| | - Mirco Küchler
- Asklepios Campus Hamburg, Semmelweis University Budapest, Hamburg, Germany; Department of Surgery, Division of HPB Surgery, Asklepios Hospital Barmbek, Hamburg, Germany
| | - Kim C Wagner
- Asklepios Campus Hamburg, Semmelweis University Budapest, Hamburg, Germany; Department of Surgery, Division of HPB Surgery, Asklepios Hospital Barmbek, Hamburg, Germany
| | - Tim Reese
- Asklepios Campus Hamburg, Semmelweis University Budapest, Hamburg, Germany; Department of Surgery, Division of HPB Surgery, Asklepios Hospital Barmbek, Hamburg, Germany
| | - Mareike Ehmke
- Department of Surgery, Division of HPB Surgery, Asklepios Hospital Barmbek, Hamburg, Germany
| | | | - Moritz Kleine
- Department of General, Visceral and Transplant Surgery, Hannover Medical School, Hannover, Germany
| | - Karl J Oldhafer
- Asklepios Campus Hamburg, Semmelweis University Budapest, Hamburg, Germany; Department of Surgery, Division of HPB Surgery, Asklepios Hospital Barmbek, Hamburg, Germany
| |
Collapse
|
9
|
He L, Yuan L, Sun Y, Wang P, Zhang H, Feng X, Wang Z, Zhang W, Yang C, Zeng YA, Zhao Y, Chen C, Zhang L. Glucocorticoid Receptor Signaling Activates TEAD4 to Promote Breast Cancer Progression. Cancer Res 2019; 79:4399-4411. [PMID: 31289134 DOI: 10.1158/0008-5472.can-19-0012] [Citation(s) in RCA: 70] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 04/24/2019] [Accepted: 07/01/2019] [Indexed: 11/16/2022]
Abstract
The Hippo pathway plays a critical role in cell growth and tumorigenesis. The activity of TEA domain transcription factor 4 (TEAD4) determines the output of Hippo signaling; however, the regulation and function of TEAD4 has not been explored extensively. Here, we identified glucocorticoids (GC) as novel activators of TEAD4. GC treatment facilitated glucocorticoid receptor (GR)-dependent nuclear accumulation and transcriptional activation of TEAD4. TEAD4 positively correlated with GR expression in human breast cancer, and high expression of TEAD4 predicted poor survival of patients with breast cancer. Mechanistically, GC activation promoted GR interaction with TEAD4, forming a complex that was recruited to the TEAD4 promoter to boost its own expression. Functionally, the activation of TEAD4 by GC promoted breast cancer stem cells maintenance, cell survival, metastasis, and chemoresistance both in vitro and in vivo. Pharmacologic inhibition of TEAD4 inhibited GC-induced breast cancer chemoresistance. In conclusion, our study reveals a novel regulation and functional role of TEAD4 in breast cancer and proposes a potential new strategy for breast cancer therapy. SIGNIFICANCE: This study provides new insight into the role of glucocorticoid signaling in breast cancer, with potential for clinical translation.
Collapse
Affiliation(s)
- Lingli He
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, University of Chinese Academy of Sciences, Shanghai, People's Republic of China.,Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai, People's Republic of China
| | - Liang Yuan
- School of Life Science and Technology, Shanghai Tech University, Shanghai, People's Republic of China
| | - Yang Sun
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, University of Chinese Academy of Sciences, Shanghai, People's Republic of China.,Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai, People's Republic of China
| | - Pingyang Wang
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, University of Chinese Academy of Sciences, Shanghai, People's Republic of China.,Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai, People's Republic of China
| | - Hailin Zhang
- Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences and Yunnan Province, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, People's Republic of China
| | - Xue Feng
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, University of Chinese Academy of Sciences, Shanghai, People's Republic of China.,Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai, People's Republic of China
| | - Zuoyun Wang
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, University of Chinese Academy of Sciences, Shanghai, People's Republic of China.,Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai, People's Republic of China
| | - Wenxiang Zhang
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, University of Chinese Academy of Sciences, Shanghai, People's Republic of China.,Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai, People's Republic of China
| | - Chuanyu Yang
- Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences and Yunnan Province, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, People's Republic of China
| | - Yi Arial Zeng
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, University of Chinese Academy of Sciences, Shanghai, People's Republic of China.,Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai, People's Republic of China
| | - Yun Zhao
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, University of Chinese Academy of Sciences, Shanghai, People's Republic of China.,Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai, People's Republic of China.,School of Life Science and Technology, Shanghai Tech University, Shanghai, People's Republic of China
| | - Ceshi Chen
- Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences and Yunnan Province, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, People's Republic of China. .,Institute of Stem Cell and Reproductive Biology, Chinese Academy of Sciences, Beijing, People's Republic of China.,KIZ-CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, People's Republic of China
| | - Lei Zhang
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, University of Chinese Academy of Sciences, Shanghai, People's Republic of China. .,Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai, People's Republic of China.,School of Life Science and Technology, Shanghai Tech University, Shanghai, People's Republic of China
| |
Collapse
|
10
|
Huh HD, Kim DH, Jeong HS, Park HW. Regulation of TEAD Transcription Factors in Cancer Biology. Cells 2019; 8:E600. [PMID: 31212916 PMCID: PMC6628201 DOI: 10.3390/cells8060600] [Citation(s) in RCA: 149] [Impact Index Per Article: 29.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2019] [Revised: 06/10/2019] [Accepted: 06/11/2019] [Indexed: 12/11/2022] Open
Abstract
Transcriptional enhanced associate domain (TEAD) transcription factors play important roles during development, cell proliferation, regeneration, and tissue homeostasis. TEAD integrates with and coordinates various signal transduction pathways including Hippo, Wnt, transforming growth factor beta (TGFβ), and epidermal growth factor receptor (EGFR) pathways. TEAD deregulation affects well-established cancer genes such as KRAS, BRAF, LKB1, NF2, and MYC, and its transcriptional output plays an important role in tumor progression, metastasis, cancer metabolism, immunity, and drug resistance. To date, TEADs have been recognized to be key transcription factors of the Hippo pathway. Therefore, most studies are focused on the Hippo kinases and YAP/TAZ, whereas the Hippo-dependent and Hippo-independent regulators and regulations governing TEAD only emerged recently. Deregulation of the TEAD transcriptional output plays important roles in tumor progression and serves as a prognostic biomarker due to high correlation with clinicopathological parameters in human malignancies. In addition, discovering the molecular mechanisms of TEAD, such as post-translational modifications and nucleocytoplasmic shuttling, represents an important means of modulating TEAD transcriptional activity. Collectively, this review highlights the role of TEAD in multistep-tumorigenesis by interacting with upstream oncogenic signaling pathways and controlling downstream target genes, which provides unprecedented insight and rationale into developing TEAD-targeted anticancer therapeutics.
Collapse
Affiliation(s)
- Hyunbin D Huh
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul 03722, Korea.
| | - Dong Hyeon Kim
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul 03722, Korea.
| | - Han-Sol Jeong
- Division of Applied Medicine, School of Korean Medicine, Pusan National University, Yangsan, Gyeongnam 50612, Korea.
| | - Hyun Woo Park
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul 03722, Korea.
| |
Collapse
|
11
|
Alternative splicing rewires Hippo signaling pathway in hepatocytes to promote liver regeneration. Nat Struct Mol Biol 2018; 25:928-939. [PMID: 30250226 PMCID: PMC6173981 DOI: 10.1038/s41594-018-0129-2] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Accepted: 08/07/2018] [Indexed: 12/29/2022]
Abstract
During liver regeneration, most new hepatocytes arise via self-duplication; yet, the underlying mechanisms that drive hepatocyte proliferation following injury remain poorly defined. By combining high-resolution transcriptome- and polysome-profiling of hepatocytes purified from quiescent and toxin-injured mouse livers, we uncover pervasive alterations in the mRNA translation of metabolic and RNA processing factors, which modulate the protein levels of a set of splicing regulators. Specifically, downregulation of ESRP2 activates a neonatal alternative splicing program that rewires the Hippo signaling pathway in regenerating hepatocytes. We show that production of neonatal splice isoforms attenuates Hippo signaling, enables greater transcriptional activation of downstream target genes, and facilitates liver regeneration. We further demonstrate that ESRP2 deletion in mice causes excessive hepatocyte proliferation upon injury, whereas forced expression of ESRP2 inhibits proliferation by suppressing the expression of neonatal Hippo pathway isoforms. Thus, our findings reveal an ESRP2-Hippo pathway-alternative splicing axis that supports regeneration following chronic liver injury.
Collapse
|
12
|
Lin KC, Park HW, Guan KL. Regulation of the Hippo Pathway Transcription Factor TEAD. Trends Biochem Sci 2017; 42:862-872. [PMID: 28964625 DOI: 10.1016/j.tibs.2017.09.003] [Citation(s) in RCA: 195] [Impact Index Per Article: 27.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Revised: 09/06/2017] [Accepted: 09/07/2017] [Indexed: 01/07/2023]
Abstract
The TEAD transcription factor family is best known for transcriptional output of the Hippo signaling pathway and has been implicated in processes such as development, cell growth and proliferation, tissue homeostasis, and regeneration. Our understanding of the functional importance of TEADs has increased dramatically since its initial discovery three decades ago. The majority of our knowledge of TEADs is in the context of Hippo signaling as nuclear DNA-binding proteins passively activated by Yes-associated protein (YAP) and transcriptional activator with PDZ-binding domain (TAZ), transcription coactivators downstream of the Hippo pathway. However, recent studies suggest that TEAD itself is actively regulated. Here, we highlight evidence demonstrating Hippo-independent regulation of TEADs and the potential impacts these studies may have on new cancer therapeutics.
Collapse
Affiliation(s)
- Kimberly C Lin
- Department of Pharmacology and Moores Cancer Center, University of California San Diego, La Jolla, CA 92093, USA
| | - Hyun Woo Park
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul 120-749, Republic of Korea
| | - Kun-Liang Guan
- Department of Pharmacology and Moores Cancer Center, University of California San Diego, La Jolla, CA 92093, USA.
| |
Collapse
|
13
|
Landin-Malt A, Benhaddou A, Zider A, Flagiello D. An evolutionary, structural and functional overview of the mammalian TEAD1 and TEAD2 transcription factors. Gene 2016; 591:292-303. [PMID: 27421669 DOI: 10.1016/j.gene.2016.07.028] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Revised: 07/08/2016] [Accepted: 07/11/2016] [Indexed: 01/22/2023]
Abstract
TEAD proteins constitute a family of highly conserved transcription factors, characterized by a DNA-binding domain called the TEA domain and a protein-binding domain that permits association with transcriptional co-activators. TEAD proteins are unable to induce transcription on their own. They have to interact with transcriptional cofactors to do so. Once TEADs bind their co-activators, the different complexes formed are known to regulate the expression of genes that are crucial for embryonic development, important for organ formation (heart, muscles), and involved in cell death and proliferation. In the first part of this review we describe what is known of the structure of TEAD proteins. We then focus on two members of the family: TEAD1 and TEAD2. First the different transcriptional cofactors are described. These proteins can be classified in three categories: i), cofactors regulating chromatin conformation, ii), cofactors able to bind DNA, and iii), transcriptional cofactors without DNA binding domain. Finally we discuss the recent findings that identified TEAD1 and 2 and its coactivators involved in cancer progression.
Collapse
Affiliation(s)
- André Landin-Malt
- Department of Cell Biology, University of Virginia Health System, Charlottesville, VA 22908, USA.
| | - Ataaillah Benhaddou
- Univ Paris Diderot, Sorbonne Paris Cité, Team Regulation of Cell-Fate Specification in the Mouse, IJM, UMR 7592 CNRS, Paris, France.
| | - Alain Zider
- Univ Paris Diderot, Sorbonne Paris Cité, Team Molecular Oncology and Ovarian Pathologies, IJM, UMR 7592 CNRS, Paris, France.
| | - Domenico Flagiello
- Univ Paris Diderot, Sorbonne Paris Cité, Team Regulation of Cell-Fate Specification in the Mouse, IJM, UMR 7592 CNRS, Paris, France.
| |
Collapse
|
14
|
Prenatal exposure to dietary fat induces changes in the transcriptional factors, TEF and YAP, which may stimulate differentiation of peptide neurons in rat hypothalamus. PLoS One 2013; 8:e77668. [PMID: 24147051 PMCID: PMC3795669 DOI: 10.1371/journal.pone.0077668] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Accepted: 09/05/2013] [Indexed: 01/21/2023] Open
Abstract
Gestational exposure to a high-fat diet (HFD) stimulates the differentiation of orexigenic peptide-expressing neurons in the hypothalamus of offspring. To examine possible mechanisms that mediate this phenomenon, this study investigated the transcriptional factor, transcription enhancer factor-1 (TEF), and co-activator, Yes-associated protein (YAP), which when inactivated stimulate neuronal differentiation. In rat embryos and postnatal offspring prenatally exposed to a HFD compared to chow, changes in hypothalamic TEF and YAP and their relationship to the orexigenic peptide, enkephalin (ENK), were measured. The HFD offspring at postnatal day 15 (P15) exhibited in the hypothalamic paraventricular nucleus a significant reduction in YAP mRNA and protein, and increased levels of inactive and total TEF protein, with no change in mRNA. Similarly, HFD-exposed embryos at embryonic day 19 (E19) showed in whole hypothalamus significantly decreased levels of YAP mRNA and protein and TEF mRNA, and increased levels of inactive TEF protein, suggesting that HFD inactivates TEF and YAP. This was accompanied by increased density and fluorescence intensity of ENK neurons. A close relationship between TEF and ENK was suggested by the finding that TEF co-localizes with this peptide in hypothalamic neurons and HFD reduced the density of TEF/ENK co-labeled neurons, even while the number and fluorescence intensity of single-labeled TEF neurons were increased. Increased YAP inactivity by HFD was further evidenced by a decrease in number and fluorescence intensity of YAP-containing neurons, although the density of YAP/ENK co-labeled neurons was unaltered. Genetic knockdown of TEF or YAP stimulated ENK expression in hypothalamic neurons, supporting a close relationship between these transcription factors and neuropeptide. These findings suggest that prenatal HFD exposure inactivates both hypothalamic TEF and YAP, by either decreasing their levels or increasing their inactive form, and that this contributes to the stimulatory effect of HFD on ENK expression and possibly the differentiation of ENK-expressing neurons.
Collapse
|
15
|
The TEA transcription factor Tec1 links TOR and MAPK pathways to coordinate yeast development. Genetics 2011; 189:479-94. [PMID: 21840851 DOI: 10.1534/genetics.111.133629] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
In Saccharomyces cerevisiae, the TEA transcription factor Tec1 controls several developmental programs in response to nutrients and pheromones. Tec1 is targeted by the pheromone-responsive Fus3/Kss1 mitogen-activated protein kinase (MAPK) cascade, which destabilizes the transcription factor to ensure efficient mating of sexual partner cells. The regulation of Tec1 by signaling pathways that control cell division and development in response to nutrients, however, is not known. Here, we show that Tec1 protein stability is under control of the nutrient-sensitive target of rapamycin complex 1 (TORC1) signaling pathway via the Tip41-Tap42-Sit4 branch. We further show that degradation of Tec1 upon inhibition of TORC1 by rapamycin does not involve polyubiquitylation and appears to be proteasome independent. However, rapamycin-induced Tec1 degradation depends on the HECT ubiquitin ligase Rsp5, which physically interacts with Tec1 via conserved PxY motives. We further demonstrate that rapamycin and mating pheromone control Tec1 protein stability through distinct mechanisms by targeting different domains of the transcription factor. Finally, we show that Tec1 is a positive regulator of yeast chronological lifespan (CLS), a known TORC1-regulated process. Our findings indicate that in yeast, Tec1 links TORC1 and MAPK signaling pathways to coordinate control of cellular development in response to different stimuli.
Collapse
|
16
|
Deng H, Hughes SC, Bell JB, Simmonds AJ. Alternative requirements for Vestigial, Scalloped, and Dmef2 during muscle differentiation in Drosophila melanogaster. Mol Biol Cell 2008; 20:256-69. [PMID: 18987343 DOI: 10.1091/mbc.e08-03-0288] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Vertebrate development requires the activity of the myocyte enhancer factor 2 (mef2) gene family for muscle cell specification and subsequent differentiation. Additionally, several muscle-specific functions of MEF2 family proteins require binding additional cofactors including members of the Transcription Enhancing Factor-1 (TEF-1) and Vestigial-like protein families. In Drosophila there is a single mef2 (Dmef2) gene as well single homologues of TEF-1 and vestigial-like, scalloped (sd), and vestigial (vg), respectively. To clarify the role(s) of these factors, we examined the requirements for Vg and Sd during Drosophila muscle specification. We found that both are required for muscle differentiation as loss of sd or vg leads to a reproducible loss of a subset of either cardiac or somatic muscle cells in developing embryos. This muscle requirement for Sd or Vg is cell specific, as ubiquitous overexpression of either or both of these proteins in muscle cells has a deleterious effect on muscle differentiation. Finally, using both in vitro and in vivo binding assays, we determined that Sd, Vg, and Dmef2 can interact directly. Thus, the muscle-specific phenotypes we have associated with Vg or Sd may be a consequence of alternative binding of Vg and/or Sd to Dmef2 forming alternative protein complexes that modify Dmef2 activity.
Collapse
Affiliation(s)
- Hua Deng
- Department of Cell Biology, Department of Biological Sciences, and Department of Medical Genetics, University of Alberta, Edmonton, Canada
| | | | | | | |
Collapse
|
17
|
Yoshida T. MCAT elements and the TEF-1 family of transcription factors in muscle development and disease. Arterioscler Thromb Vasc Biol 2007; 28:8-17. [PMID: 17962623 DOI: 10.1161/atvbaha.107.155788] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
MCAT elements are located in the promoter-enhancer regions of cardiac, smooth, and skeletal muscle-specific genes including cardiac troponin T, beta-myosin heavy chain, smooth muscle alpha-actin, and skeletal alpha-actin, and play a key role in the regulation of these genes during muscle development and disease. The binding factors of MCAT elements are members of the transcriptional enhancer factor-1 (TEF-1) family. However, it has not been fully understood how these transcription factors confer cell-specific expression in muscle, because their expression patterns are relatively broad. Results of recent studies revealed multiple mechanisms whereby TEF-1 family members control MCAT element-dependent muscle-specific gene expression, including posttranslational modifications of TEF-1 family members, the presence of muscle-selective TEF-1 cofactors, and cell-selective control of TEF-1 accessibility to MCAT elements. In addition, of particular interest, recent studies regarding MCAT element-dependent transcription of the myocardin gene and the smooth muscle alpha-actin gene in muscle provide evidence for the transcriptional diversity among distinct cell types and subtypes. This article summarizes the role of MCAT elements and the TEF-1 family of transcription factors in muscle development and disease, and reviews recent progress in our understanding of the transcriptional regulatory mechanisms involved in MCAT element-dependent muscle-specific gene expression.
Collapse
Affiliation(s)
- Tadashi Yoshida
- Department of Molecular Physiology and Biological Physics, University of Virginia, MR5 Room 1226, 415 Lane Road, Charlottesville, Virginia 22908, USA.
| |
Collapse
|
18
|
Gupta MP. Factors controlling cardiac myosin-isoform shift during hypertrophy and heart failure. J Mol Cell Cardiol 2007; 43:388-403. [PMID: 17720186 PMCID: PMC2701247 DOI: 10.1016/j.yjmcc.2007.07.045] [Citation(s) in RCA: 157] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2007] [Revised: 06/25/2007] [Accepted: 07/10/2007] [Indexed: 12/18/2022]
Abstract
Myosin is a molecular motor, which interacts with actin to convert the energy from ATP hydrolysis into mechanical work. In cardiac myocytes, two myosin isoforms are expressed and their relative distribution changes in different developmental and pathophysiologic conditions of the heart. It has been realized for a long time that a shift in myosin isoforms plays a major role in regulating myocardial contractile activity. With the recent evidence implicating that alteration in myosin isoform ratio may be eventually beneficial for the treatment of a stressed heart, a new interest has developed to find out ways of controlling the myosin isoform shift. This article reviews the published data describing the role of myosin isoforms in the heart and highlighting the importance of various factors shown to influence myosin isofrom shift during physiology and disease states of the heart.
Collapse
Affiliation(s)
- Mahesh P Gupta
- Department of Surgery, Basic Science Division, MC5040, University of Chicago, 5841 S. Maryland Avenue, Chicago, IL 60637, USA.
| |
Collapse
|
19
|
Gan Q, Yoshida T, Li J, Owens GK. Smooth muscle cells and myofibroblasts use distinct transcriptional mechanisms for smooth muscle alpha-actin expression. Circ Res 2007; 101:883-92. [PMID: 17823374 DOI: 10.1161/circresaha.107.154831] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
There has been considerable controversy regarding the lineage relationship between smooth muscle cells (SMCs) and myofibroblasts, because they express a number of common cell-selective markers including smooth muscle (SM) alpha-actin. We have shown previously that MCAT elements within the SM alpha-actin promoter confer differential activity in cultured SMCs versus myofibroblasts. In the present study, to determine the role of MCAT elements in vivo, we generated transgenic mice harboring an SM alpha-actin promoter-enhancer-LacZ reporter gene containing MCAT element mutations and compared transgene expression patterns with wild-type SM alpha-actin promoter-enhancer-LacZ transgenic mice. Results showed no differences in LacZ expression patterns in adult SMC-containing tissues. However, of interest, mutations of MCAT elements selectively abolished transgene expression in myofibroblasts within granulation tissue of skin wounds. In addition, mutations of MCAT elements caused a delay in the induction of transgene expression in SMCs, as well as loss of expression in cardiac and skeletal muscles during embryogenesis. Results of small interfering RNA-induced knockdown experiments showed that RTEF-1 regulated SM alpha-actin transcription in myofibroblasts, but not in differentiated SMCs. Moreover, quantitative chromatin immunoprecipitation assays revealed that RTEF-1 bound to the MCAT element-containing region within the SM alpha-actin promoter in myofibroblasts, whereas transcriptional enhancer factor (TEF)-1 was bound to the same region in differentiated SMCs. These results provide novel evidence that, although both SMCs and myofibroblasts express SM alpha-actin, they use distinct transcriptional control mechanisms for regulating its expression. Results also indicate that the MCAT element-mutated SM alpha-actin promoter-enhancer is a useful tool to direct gene expression selectively in differentiated SMCs.
Collapse
MESH Headings
- Actins/genetics
- Animals
- Antineoplastic Agents/pharmacology
- Aorta/cytology
- Basic-Leucine Zipper Transcription Factors/metabolism
- Cell Differentiation/physiology
- Cells, Cultured
- DNA-Binding Proteins/metabolism
- Fibroblasts/cytology
- Fibroblasts/physiology
- Gene Expression Regulation, Developmental/drug effects
- Gene Expression Regulation, Developmental/physiology
- Heart/embryology
- Heart/physiology
- Lac Operon
- Male
- Mice
- Mice, Transgenic
- Muscle Proteins/metabolism
- Muscle, Skeletal/cytology
- Muscle, Skeletal/embryology
- Muscle, Skeletal/physiology
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/embryology
- Muscle, Smooth, Vascular/physiology
- Phenotype
- Promoter Regions, Genetic/physiology
- TEA Domain Transcription Factors
- Transcription Factors/metabolism
- Transcription, Genetic/physiology
- Transforming Growth Factor beta1/pharmacology
- Tretinoin/pharmacology
Collapse
Affiliation(s)
- Qiong Gan
- Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, VA 22908, USA
| | | | | | | |
Collapse
|
20
|
Mann CJ, Osborn DPS, Hughes SM. Vestigial-like-2b (VITO-1b) and Tead-3a (Tef-5a) expression in zebrafish skeletal muscle, brain and notochord. Gene Expr Patterns 2007; 7:827-36. [PMID: 17916448 DOI: 10.1016/j.modgep.2007.08.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2007] [Revised: 08/03/2007] [Accepted: 08/07/2007] [Indexed: 12/22/2022]
Abstract
The vestigial gene has been shown to control skeletal muscle formation in Drosophila and the related Vestigial-like 2 (Vgl-2) protein plays a similar role in mice. Vgl-family proteins are thought to regulate tissue-specific gene expression by binding to members of the broadly expressed Scalloped/Tef/TEAD transcription factor family. Zebrafish have at least four Vgl genes, including two Vgl-2s, and at least three TEAD genes, including two Tead3s. We describe the cloning and expression of one member from each family in the zebrafish. A novel gene, vgl-2b, with closest homology to mouse and human vgl-2, is expressed transiently in nascent notochord and in muscle fibres as they undergo terminal differentiation during somitogenesis. Muscle cells also express a TEAD-3 homologue, a possible partner of Vgl-2b, during myoblast differentiation and early fibre assembly. Tead-3a is also expressed in rhombomeres, eye and epiphysis regions.
Collapse
Affiliation(s)
- Christopher J Mann
- MRC Centre for Developmental Neurobiology and Randall Division for Cell and Molecular Biophysics, King's College London, London SE1 1UL, UK
| | | | | |
Collapse
|
21
|
L'honore A, Rana V, Arsic N, Franckhauser C, Lamb NJ, Fernandez A. Identification of a new hybrid serum response factor and myocyte enhancer factor 2-binding element in MyoD enhancer required for MyoD expression during myogenesis. Mol Biol Cell 2007; 18:1992-2001. [PMID: 17377068 PMCID: PMC1877109 DOI: 10.1091/mbc.e06-09-0867] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2006] [Revised: 02/06/2007] [Accepted: 03/14/2007] [Indexed: 01/19/2023] Open
Abstract
MyoD is a critical myogenic factor induced rapidly upon activation of quiescent satellite cells, and required for their differentiation during muscle regeneration. One of the two enhancers of MyoD, the distal regulatory region, is essential for MyoD expression in postnatal muscle. This enhancer contains a functional divergent serum response factor (SRF)-binding CArG element required for MyoD expression during myoblast growth and muscle regeneration in vivo. Electrophoretic mobility shift assay, chromatin immunoprecipitation, and microinjection analyses show this element is a hybrid SRF- and MEF2 Binding (SMB) sequence where myocyte enhancer factor 2 (MEF2) complexes can compete out binding of SRF at the onset of differentiation. As cells differentiate into postmitotic myotubes, MyoD expression no longer requires SRF but instead MEF2 binding to this dual-specificity element. As such, the MyoD enhancer SMB element is the site for a molecular relay where MyoD expression is first initiated in activated satellite cells in an SRF-dependent manner and then increased and maintained by MEF2 binding in differentiated myotubes. Therefore, SMB is a DNA element with dual and stage-specific binding activity, which modulates the effects of regulatory proteins critical in controlling the balance between proliferation and differentiation.
Collapse
Affiliation(s)
- Aurore L'honore
- Cell Biology Unit, Institut de Génétique Humaine, Centre National de la Recherche Scientifique, 34396 Montpellier Cedex 05, France
| | - Vanessa Rana
- Cell Biology Unit, Institut de Génétique Humaine, Centre National de la Recherche Scientifique, 34396 Montpellier Cedex 05, France
| | - Nikola Arsic
- Cell Biology Unit, Institut de Génétique Humaine, Centre National de la Recherche Scientifique, 34396 Montpellier Cedex 05, France
| | - Celine Franckhauser
- Cell Biology Unit, Institut de Génétique Humaine, Centre National de la Recherche Scientifique, 34396 Montpellier Cedex 05, France
| | - Ned J. Lamb
- Cell Biology Unit, Institut de Génétique Humaine, Centre National de la Recherche Scientifique, 34396 Montpellier Cedex 05, France
| | - Anne Fernandez
- Cell Biology Unit, Institut de Génétique Humaine, Centre National de la Recherche Scientifique, 34396 Montpellier Cedex 05, France
| |
Collapse
|
22
|
Anbanandam A, Albarado DC, Nguyen CT, Halder G, Gao X, Veeraraghavan S. Insights into transcription enhancer factor 1 (TEF-1) activity from the solution structure of the TEA domain. Proc Natl Acad Sci U S A 2006; 103:17225-30. [PMID: 17085591 PMCID: PMC1859914 DOI: 10.1073/pnas.0607171103] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Transcription enhancer factor 1 is essential for cardiac, skeletal, and smooth muscle development and uses its N-terminal TEA domain (TEAD) to bind M-CAT elements. Here, we present the first structure of TEAD and show that it is a three-helix bundle with a homeodomain fold. Structural data reveal how TEAD binds DNA. Using structure-function correlations, we find that the L1 loop is essential for cooperative loading of TEAD molecules on to tandemly duplicated M-CAT sites. Furthermore, using a microarray chip-based assay, we establish that known binding sites of the full-length protein are only a subset of DNA elements recognized by TEAD. Our results provide a model for understanding the regulation of genome-wide gene expression during development by TEA/ATTS family of transcription factors.
Collapse
Affiliation(s)
- Asokan Anbanandam
- *Department of Biochemistry & Molecular Biology, University of Texas Medical School, Houston, TX 77030
| | - Diana C. Albarado
- *Department of Biochemistry & Molecular Biology, University of Texas Medical School, Houston, TX 77030
| | - Catherine T. Nguyen
- *Department of Biochemistry & Molecular Biology, University of Texas Medical School, Houston, TX 77030
| | - Georg Halder
- Department of Biochemistry and Molecular Biology, University of Texas M. D. Anderson Cancer Center, Houston, TX 77030; and
| | - Xiaolian Gao
- Department of Biology and Biochemistry, University of Houston, Houston, TX 77204
| | - Sudha Veeraraghavan
- *Department of Biochemistry & Molecular Biology, University of Texas Medical School, Houston, TX 77030
- To whom correspondence should be addressed. E-mail:
| |
Collapse
|
23
|
Chow L, Berube J, Fromont A, Bell JB. Ability of scalloped deletion constructs to rescue sd mutant wing phenotypes in Drosophila melanogaster. Genome 2005; 47:849-59. [PMID: 15499399 DOI: 10.1139/g04-060] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Scalloped (SD) and Vestigial (VG) proteins physically interact to form a selector complex that activates genes involved in wing development in Drosophila melanogaster. SD belongs to a conserved family of transcription factors containing the TEA/ATTS DNA-binding motif. VG is also a nuclear protein providing the activator function for the SD VG complex. The TEA DNA-binding domain and the VG interacting domain (VID) of SD have been previously identified and described. However, they, and possibly other functional domains of SD, have not been thoroughly characterized in vivo. Herein, transgenic constructs encoding various truncations of SD were used to assess their respective ability to rescue the mutant wing phenotype of two viable sd recessive mutations (sd(ETX4) and sd(58d)). The transgenic strains produced were also tested for the ability to induce further sd expression, an ability possessed by full length SD. The functional dissection of SD confirms that specific regions are necessary for wing development and provides further information as to how the SD VG complex functions to promote wing fate. Previous experiments have shown that expression of full length SD can cause a dominant negative wing phenotype. We show that expression of constructs that delete the SD DNA-binding domain can also cause a dominant negative phenotype in a background with either of the two tester sd strains. In contrast, SD constructs that delete the VID have no effect on the wing phenotype in either tester background. Finally, a significant portion of SD at the N-terminal end appears to be dispensable with respect to normal wing development, as this construct behaves the same as full length SD in our assays.
Collapse
Affiliation(s)
- Leola Chow
- Department of Biological Sciences, University of Alberta, Edmonton, AB T6G 2E9, Canada
| | | | | | | |
Collapse
|
24
|
Hashimoto T, Sugiyama A, Taguchi S. Myosin heavy chain isoforms expression and cyclic AMP concentrations in hypoxia-induced hypertrophied right ventricle in rats. Comp Biochem Physiol B Biochem Mol Biol 2005; 138:365-70. [PMID: 15325336 DOI: 10.1016/j.cbpc.2004.04.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2003] [Revised: 04/27/2004] [Accepted: 04/28/2004] [Indexed: 11/15/2022]
Abstract
We have previously demonstrated that the relative expression of myosin heavy chain-beta (MHC-beta) in both ventricles of rats exposed to long-term hypobaric hypoxia correlated significantly with the relative ventricular mass. In the present study, we investigated whether an increased expression of MHC-beta was accompanied by a reduction in cyclic AMP (cAMP) activity in hypoxia-induced hypertrophied right ventricle (RV). We used male Wistar-Kyoto rats born and raised at simulated altitudes (2200 m: H2 group or 4000 m: H4 group) compared to age-matched sea level controls (SC group). There were no significant differences between the groups in basal and forskolin-stimulated adenylyl cyclase (AC) activities. The basal and IBMX-inhibited phosphodiesterase (PDE) activities were slightly higher in both hypoxic groups (p>0.05), except that the H2 group had a higher basal PDE activity than the SC group (p<0.05). The AC/PDE activity ratios were significantly decreased in both hypoxic groups (p<0.05), suggesting that low concentrations of cellular cAMP were maintained in the RV under hypoxic conditions. However, there were no correlations between MHC-beta expression and either AC activity, PDE activity, or AC/PDE activity ratio. These results provided evidence against the causal role for cAMP concentration in the expression of MHC-beta associated with hypoxia-induced ventricular hypertrophy.
Collapse
Affiliation(s)
- Takeshi Hashimoto
- Department of Environmental Physiology, Graduate School of Human and Environmental Studies, Kyoto University, Yoshida, Sakyo, Kyoto 606-8501, Japan
| | | | | |
Collapse
|
25
|
Chen HH, Maeda T, Mullett SJ, Stewart AFR. Transcription cofactor Vgl-2 is required for skeletal muscle differentiation. Genesis 2005; 39:273-9. [PMID: 15287000 DOI: 10.1002/gene.20055] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
TEF-1 transcription factors regulate gene expression in skeletal muscle but are not muscle-specific. Instead, TEF-1 factors rely on the muscle-specific cofactor Vestigial-like 2 (Vgl-2), a protein related to Drosophila vestigial. Previously, we showed that Vgl-2 promotes skeletal muscle differentiation and activates muscle-specific promoters. However, the mechanism whereby Vgl-2 regulates TEF-1 factors and the requirement for Vgl-2 for muscle-specific gene expression were not known. In Drosophila, vestigial alters DNA binding specificity of the TEF-1 homolog scalloped to drive wing and flight muscle-specific gene expression. Here, gel mobility shift assays show that Vgl-2 differentially affects DNA binding of different TEF-1 factors. Using an antisense morpholino, we blocked the expression of Vgl-2 and a muscle-specific gene in the myogenic C2C12 cell line and in chick embryos by electroporation. These results demonstrate that Vgl-2 is required for muscle gene expression, in part by switching DNA binding of TEF-1 factors during muscle differentiation.
Collapse
Affiliation(s)
- Hsiao-Huei Chen
- Cardiovascular Institute, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | | | | | | |
Collapse
|
26
|
Srivastava A, Simmonds AJ, Garg A, Fossheim L, Campbell SD, Bell JB. Molecular and functional analysis of scalloped recessive lethal alleles in Drosophila melanogaster. Genetics 2005; 166:1833-43. [PMID: 15126402 PMCID: PMC1470810 DOI: 10.1534/genetics.166.4.1833] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The Drosophila melanogaster scalloped (sd) gene is a homolog of the human TEF-1 gene and is a member of the TEA/ATTS domain-containing family of transcription factors. In Drosophila, sd is involved in wing development as well as neural development. Herein, data are presented from a molecular analysis of five recessive lethal sd alleles. Only one of these alleles complements a viable allele associated with an sd mutant wing phenotype, suggesting that functions important for wing development are compromised by the noncomplementing alleles. Two of the wing noncomplementing alleles have mutations that help to define a VG-binding domain for the SD protein in vivo, and another noncomplementing allele has a lesion within the TEA DNA-binding domain. The VG-binding domain overlaps with a domain important for viability of the fly, since two of the sd lethal lesions are located there. The fifth lethal affects a yet undefined motif lying just outside the VG-binding domain in the C-terminal direction that affects both wing phenotype and viability. This is the first example linking mutations affecting specific amino acids in the SD protein with phenotypic consequences for the organism.
Collapse
Affiliation(s)
- Ajay Srivastava
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada
| | | | | | | | | | | |
Collapse
|
27
|
Hjerrild M, Stensballe A, Rasmussen TE, Kofoed CB, Blom N, Sicheritz-Ponten T, Larsen MR, Brunak S, Jensen ON, Gammeltoft S. Identification of phosphorylation sites in protein kinase A substrates using artificial neural networks and mass spectrometry. J Proteome Res 2004; 3:426-33. [PMID: 15253423 DOI: 10.1021/pr0341033] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Protein phosphorylation plays a key role in cell regulation and identification of phosphorylation sites is important for understanding their functional significance. Here, we present an artificial neural network algorithm: NetPhosK (http://www.cbs.dtu.dk/services/NetPhosK/) that predicts protein kinase A (PKA) phosphorylation sites. The neural network was trained with a positive set of 258 experimentally verified PKA phosphorylation sites. The predictions by NetPhosK were validated using four novel PKA substrates: Necdin, RFX5, En-2, and Wee 1. The four proteins were phosphorylated by PKA in vitro and 13 PKA phosphorylation sites were identified by mass spectrometry. NetPhosK was 100% sensitive and 41% specific in predicting PKA sites in the four proteins. These results demonstrate the potential of using integrated computational and experimental methods for detailed investigations of the phosphoproteome.
Collapse
Affiliation(s)
- Majbrit Hjerrild
- Department of Clinical Biochemistry, Glostrup Hospital, Nordre Ringvej 57, DK-2600 Glostrup, Denmark.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Giger JM, Haddad F, Qin AX, Zeng M, Baldwin KM. Effect of unloading on type I myosin heavy chain gene regulation in rat soleus muscle. J Appl Physiol (1985) 2004; 98:1185-94. [PMID: 15591287 DOI: 10.1152/japplphysiol.01099.2004] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Slow-twitch soleus, a weight-bearing hindlimb muscle, predominantly expresses the type I myosin heavy chain (MHC) isoform. However, under unloading conditions, a transition in MHC expression occurs from slow type I toward the fast-type isoforms. Transcriptional processes are believed to be involved in this adaptation. To test the hypothesis that the downregulation of MHC1 in soleus muscle following unloading is controlled through cis element(s) in the proximal region of the promoter, the MHC1 promoter was injected into soleus muscles of control rats and those subjected to 7 days of hindlimb suspension. Mutation analyses of six putative regulatory elements within the -408-bp region demonstrated that three elements, an A/T-rich, the proximal muscle-type CAT (betae3), and an E-box (-63 bp), play an important role in the basal level of MHC1 gene activity in the control soleus and function as unloading-responsive elements. Gel mobility shift assays revealed a diminished level of complex formation of the betae3 and E-box probes with nuclear extract from hindlimb suspension soleus compared with control soleus. Supershift assays indicated that transcriptional enhancer factor 1 and myogenin factors bind the betae3 and E-box elements, respectively, in the control soleus. Western blots showed that the relative concentrations of the transcriptional enhancer factor 1 and myogenin factors were significantly attenuated in the unloaded soleus compared with the control muscle. We conclude that the downregulation of MHC1 in response to unloading is due, in part, to a significant decrease in the concentration of these transcription factors available for binding the positive regulatory elements.
Collapse
Affiliation(s)
- Julia M Giger
- Dept. of Physiology and Biophysics, Univ. of California-Irvine, D-346, Med Sci I, Irvine, CA 92697, USA
| | | | | | | | | |
Collapse
|
29
|
Hjerrild M, Stensballe A, Jensen ON, Gammeltoft S, Rasmussen TE. Protein kinase A phosphorylates serine 267 in the homeodomain of engrailed-2 leading to decreased DNA binding. FEBS Lett 2004; 568:55-9. [PMID: 15196920 DOI: 10.1016/j.febslet.2004.05.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2004] [Revised: 05/10/2004] [Accepted: 05/10/2004] [Indexed: 11/30/2022]
Abstract
Engrailed-2 (En-2) belongs to an evolutionarily conserved family of DNA binding homeodomain-containing proteins that are expressed in mammalian brain during development. Here, we demonstrate that serine 267 in the homeodomain of En-2 is phosphorylated by protein kinase A (PKA) in forskolin-treated COS-7 cells. Furthermore, we analyze the physiological function of En-2 phosphorylation by PKA. The nuclear localization of En-2 is not influenced by the phosphorylation of serine 267. However, substitution of serine 267 with alanine resulted in increased binding of En-2 to DNA, while replacing serine 267 with glutamic acid resulted in decreased En-2 DNA binding. These results suggest that the transcriptional activity of En-2 is regulated by PKA.
Collapse
Affiliation(s)
- Majbrit Hjerrild
- Department of Clinical Biochemistry, Glostrup Hospital, Nordre Ringvej, DK-2600 Glostrup, Denmark.
| | | | | | | | | |
Collapse
|
30
|
Srivastava A, Simmonds AJ, Garg A, Fossheim L, Campbell SD, Bell JB. Molecular and Functional Analysis of scalloped Recessive Lethal Alleles in Drosophila melanogaster. Genetics 2004. [DOI: 10.1093/genetics/166.4.1833] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
The Drosophila melanogaster scalloped (sd) gene is a homolog of the human TEF-1 gene and is a member of the TEA/ATTS domain-containing family of transcription factors. In Drosophila, sd is involved in wing development as well as neural development. Herein, data are presented from a molecular analysis of five recessive lethal sd alleles. Only one of these alleles complements a viable allele associated with an sd mutant wing phenotype, suggesting that functions important for wing development are compromised by the noncomplementing alleles. Two of the wing noncomplementing alleles have mutations that help to define a VG-binding domain for the SD protein in vivo, and another noncomplementing allele has a lesion within the TEA DNA-binding domain. The VG-binding domain overlaps with a domain important for viability of the fly, since two of the sd lethal lesions are located there. The fifth lethal affects a yet undefined motif lying just outside the VG-binding domain in the C-terminal direction that affects both wing phenotype and viability. This is the first example linking mutations affecting specific amino acids in the SD protein with phenotypic consequences for the organism.
Collapse
Affiliation(s)
- Ajay Srivastava
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada
| | - Andrew J Simmonds
- Department of Cell Biology, University of Alberta, Edmonton, Alberta T6G 2E9, Canada
| | - Ankush Garg
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada
| | - Leif Fossheim
- Department of Cell Biology, University of Alberta, Edmonton, Alberta T6G 2E9, Canada
| | - Shelagh D Campbell
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada
| | - John B Bell
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada
| |
Collapse
|
31
|
Huey KA, Haddad F, Qin AX, Baldwin KM. Transcriptional regulation of the type I myosin heavy chain gene in denervated rat soleus. Am J Physiol Cell Physiol 2003; 284:C738-48. [PMID: 12444021 DOI: 10.1152/ajpcell.00389.2002] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Denervation (DEN) of rat soleus is associated with a decreased expression of slow type I myosin heavy chain (MHC) and an increased expression of the faster MHC isoforms. The molecular mechanisms behind these shifts remain unclear. We first investigated endogenous transcriptional activity of the type I MHC gene in normal and denervated soleus muscles via pre-mRNA analysis. Our results suggest that the type I MHC gene is regulated via transcriptional processes in the denervated soleus. Deletion and mutational analysis of the rat type I MHC promoter was then used to identify cis elements or regions of the promoter involved in this response. DEN significantly decreased in vivo activity of the -3,500, -2,500, -914, -408, -299, and -215 bp type I MHC promoters, relative to the alpha-skeletal actin promoter. In contrast, normalized -171 promoter activity was unchanged. Mutation of the betae3 element (-214/-190) in the -215 promoter and deletion of this element (-171 promoter) blunted type I downregulation with DEN. In contrast, betae3 mutation in the -408 promoters was not effective in attenuating the DEN response, suggesting the existence of additional DEN-responsive sites between -408 and -215. Western blotting and gel mobility supershift assays demonstrated decreased expression and DNA binding of transcription enhancer factor 1 (TEF-1) with DEN, suggesting that this decrease may contribute to type I MHC downregulation in denervated muscle.
Collapse
Affiliation(s)
- K A Huey
- Department of Physiology and Biophysics, University of California, Irvine 92697, USA
| | | | | | | |
Collapse
|
32
|
Andersson KB, Kowenz-Leutz E, Brendeford EM, Tygsett AHH, Leutz A, Gabrielsen OS. Phosphorylation-dependent down-regulation of c-Myb DNA binding is abrogated by a point mutation in the v-myb oncogene. J Biol Chem 2003; 278:3816-24. [PMID: 12456674 DOI: 10.1074/jbc.m209404200] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
The viral Myb (v-Myb) oncoprotein of the avian myeloblastosis virus (AMV) is an activated form of the cellular transcription factor c-Myb causing acute monoblastic leukemia in chicken. Oncogenic v-Myb alterations include N- and C-terminal deletions as well as point mutations. Whereas truncations in Myb cause loss of various protein modifications, none of the point mutations in v-Myb has been directly linked to protein modifications. Here we show that the DNA-binding domain of c-Myb can be phosphorylated on serine 116 by the catalytic subunit of protein kinase A. Phosphorylation of Ser(116) differentially destabilizes a subtype of c-Myb-DNA complexes. The V117D mutation of the AMV v-Myb oncoprotein abolishes phosphorylation of the adjacent Ser(116) residue. Modification of Ser(116) was also detected in live cells in c-Myb, but not in AMV v-Myb. Phosphorylation-mimicking mutants of c-Myb failed to activate the resident mim-1 gene. Our data imply that protein kinase A or a kinase with similar specificity negatively regulates c-Myb function, including collaboration with C/EBP, and that the leukemogenic AMV v-Myb version evades inactivation by a point mutation that abolishes a phosphoacceptor consensus site. This suggests a novel link between Myb, a signal transduction pathway, cooperativity with C/EBP, and a point mutation in the myb oncogene.
Collapse
|
33
|
Thompson M, Andrade VA, Andrade SJ, Pusl T, Ortega JM, Goes AM, Leite MF. Inhibition of the TEF/TEAD transcription factor activity by nuclear calcium and distinct kinase pathways. Biochem Biophys Res Commun 2003; 301:267-74. [PMID: 12565854 DOI: 10.1016/s0006-291x(02)03024-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Transcription enhancer factor (TEF/TEAD) is a family of four transcription factors that share a common TEA-DNA binding domain and are involved in similar cellular functions, such as cell differentiation and proliferation. All adult tissues express at least one of the four TEAD genes, so this family of transcription factors may be of widespread importance, yet little is known about their regulation. Here we examine the factors that regulate TEAD activity in CHO cells. RT-PCR indicated the presence of TEAD-1, TEAD-3, and both isoforms of TEAD-4, but not TEAD-2. Quantitative measurements showed that TEAD-4 is most abundant, followed by TEAD-3, then TEAD-1. We examined the relative effects of nuclear and cytosolic Ca(2+) on TEAD activity, since TEAD proteins are localized to the nucleus and since free Ca(2+) within the nucleus selectively regulates transcription in some systems. Chelation of nuclear but not cytosolic Ca(2+) increased TEAD activity two times above control. Inhibition of mitogen-activated protein kinase (MAPK) also increased TEAD activity, while cAMP decreased TEAD activity, and protein kinase C had no effect. Together, these results show that nuclear Ca(2+), MAPK, and cAMP each negatively regulate the activity of the TEAD transcription factor.
Collapse
Affiliation(s)
- M Thompson
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
| | | | | | | | | | | | | |
Collapse
|
34
|
Tsika RW, McCarthy J, Karasseva N, Ou Y, Tsika GL. Divergence in species and regulatory role of beta -myosin heavy chain proximal promoter muscle-CAT elements. Am J Physiol Cell Physiol 2002; 283:C1761-75. [PMID: 12388056 DOI: 10.1152/ajpcell.00278.2002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
We examined the functional role of distinct muscle-CAT (MCAT) elements during non-weight-bearing (NWB) regulation of a wild-type 293-base pair beta-myosin heavy chain (beta MyHC) transgene. Electrophoretic mobility shift assays (EMSA) revealed decreased NTEF-1, poly(ADP-ribose) polymerase, and Max binding at the human distal MCAT element when using NWB soleus vs. control soleus nuclear extract. Compared with the wild-type transgene, expression assays revealed that distal MCAT element mutation decreased basal transgene expression, which was decreased further in response to NWB. EMSA analysis of the human proximal MCAT (pMCAT) element revealed low levels of NTEF-1 binding that did not differ between control and NWB extract, whereas the rat pMCAT element displayed robust NTEF-1 binding that decreased when using NWB soleus extracts. Differences in binding between human and rat pMCAT elements were consistent whether using rat or mouse nuclear extract or in vitro synthesized human TEF-1 proteins. Our results provide the first evidence that 1) different binding properties and likely regulatory functions are served by the human and rat pMCAT elements, and 2) previously unrecognized beta MyHC proximal promoter elements contribute to NWB regulation.
Collapse
Affiliation(s)
- Richard W Tsika
- Department of Biochemistry, School of Medicine, University of Missouri-Columbia, Columbia, Missouri 65211, USA.
| | | | | | | | | |
Collapse
|
35
|
Ou CJ, Wong ML, Chang TJ. A TEF-1-element is required for activation of the promoter of pseudorabies virus glycoprotein X gene by IE180. Virus Genes 2002; 25:241-53. [PMID: 12881636 DOI: 10.1023/a:1020915706724] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The pseudorabies virus (PRV) immediate-early regulatory protein IE180 is able to transactivate the viral early and late genes. Using chloramphenicol acetyltransferase (CAT) assay, we investigated the transactivation function of IE180 to the promoter of PRV glycoprotein X (gX) gene, and our results showed that IE180 could significantly increase the expression of CAT gene which was under the control of gX promoter. To further identify the activation domains of IE180 protein that interact with the gX promoter sequences, various truncated mutants of IE180 gene and gX promoter gene were constructed and analyzed by CAT and gel retardation assay. Results revealed that the N-terminal amino acid residues from 133 to 736 of IE180 could interact with the binding site of transcriptional enhancer factor-1 (TEF-1) that resides in the gX promoter. Formation of protein-DNA complexes between the IE180 protein and the TEF-1 element of the gX promoter was observed using electrophoretic mobility shift assay (EMSA) as well as Southwestern blot analysis. These results indicated that a direct interaction occurred between IE180 and the TEF-1 element; and this interaction was abolished if the TEF-1 element was mutated. The association of IE180 with the TEF-1 element was further confirmed by the supershift of EMSA complexes using IE180 specific antibody. Taken together, our results suggested that formation of a complex between the IE180 protein and TEF-1 element in the gX promoter region was involved in the transcriptional regulation of the gX gene.
Collapse
Affiliation(s)
- Chia-Jen Ou
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung-Hsing University, Taichung 402, Taiwan, ROC
| | | | | |
Collapse
|
36
|
Maeda T, Mazzulli JR, Farrance IKG, Stewart AFR. Mouse DTEF-1 (ETFR-1, TEF-5) is a transcriptional activator in alpha 1-adrenergic agonist-stimulated cardiac myocytes. J Biol Chem 2002; 277:24346-52. [PMID: 11986313 DOI: 10.1074/jbc.m201171200] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
alpha(1)-Adrenergic signaling in cardiac myocytes activates the skeletal muscle alpha-actin gene through an MCAT cis-element, the binding site of the transcriptional enhancer factor-1 (TEF-1) family of transcription factors. TEF-1 accounts for more than 85% of the MCAT binding activity in neonatal rat cardiac myocytes. Other TEF-1 family members account for the rest. Although TEF-1 itself has little effect on the alpha(1)-adrenergic activation of skeletal muscle alpha-actin, the related factor RTEF-1 augments the response and is a target of alpha(1)-adrenergic signaling. Here, we examined another TEF-1 family member expressed in cardiac muscle, DTEF-1, and observed that it also augmented the alpha(1)-adrenergic response of skeletal muscle alpha-actin. A DTEF-1 peptide-specific antibody revealed that endogenous DTEF-1 accounts for up to 5% of the MCAT binding activity in neonatal rat cardiac myocytes. A TEF-1/DTEF-1 chimera suggests that alpha(1)-adrenergic signaling modulates DTEF-1 function. Orthophosphate labeling and immunoprecipitation of an epitope-tagged DTEF-1 showed that DTEF-1 is phosphorylated in vivo. alpha(1)-Adrenergic stimulation increased while phosphatase treatment lowered the MCAT binding by DTEF-1 and the endogenous non-TEF-1 MCAT-binding factor. In contrast, alpha(1)-adrenergic stimulation did not alter, and phosphatase treatment increased, MCAT binding of TEF-1 and RTEF-1. Taken together, these results suggest that DTEF-1 is a target for alpha(1)-adrenergic activation of the skeletal muscle alpha-actin gene in neonatal rat cardiac myocytes.
Collapse
Affiliation(s)
- Tomoji Maeda
- Cardiovascular Institute, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA
| | | | | | | |
Collapse
|
37
|
Maeda T, Gupta MP, Stewart AFR. TEF-1 and MEF2 transcription factors interact to regulate muscle-specific promoters. Biochem Biophys Res Commun 2002; 294:791-7. [PMID: 12061776 DOI: 10.1016/s0006-291x(02)00556-9] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Many muscle-specific genes are regulated by transcriptional enhancer factor-1 (TEF-1), serum response factor (SRF), and myocyte enhancer factor-2 (MEF2) transcription factors. TEF-1 interacts with the MADS domain of SRF and together SRF and TEF-1 co-activate the skeletal alpha-actin promoter. MEF2 factors also contain a MADS domain with 50% amino acid identity to the SRF MADS domain. Because of this sequence divergence, some SRF co-factors do not interact with MEF2. To demonstrate that TEF-1 factors could also interact with MEF2 through its MADS domain, we used co-immunoprecipitation and GST pull-down assays in vitro and a mammalian two-hybrid assay in vivo. The MADS domain was not sufficient for MEF2 interaction with TEF-1, because additional sequences in the activation domains of both proteins were required for in vivo association. The physiological significance of this interaction was also demonstrated by transient transfection assays using muscle-specific promoters. Our results suggest that by their interaction with MEF2 factors, TEF-1 factors can control MEF2-dependent muscle-specific gene expression.
Collapse
Affiliation(s)
- Tomoji Maeda
- Cardiovascular Institute, School of Medicine, University of Pittsburgh, BST 1704.3, PA 15213, USA
| | | | | |
Collapse
|
38
|
Davis FJ, Gupta M, Pogwizd SM, Bacha E, Jeevanandam V, Gupta MP. Increased expression of alternatively spliced dominant-negative isoform of SRF in human failing hearts. Am J Physiol Heart Circ Physiol 2002; 282:H1521-33. [PMID: 11893590 DOI: 10.1152/ajpheart.00844.2001] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Serum response factor (SRF) has been shown to play a key role in cardiac cell growth and muscle gene regulation. To understand the role of SRF in heart failure, we compared its expression pattern between control and failing human heart samples. Western blot analysis of control samples showed expression of four different isoforms of SRF, with ~67-kDa full-length SRF being the predominant isoform. Interestingly, in failing hearts we found robust expression of a low-molecular-mass (~52 kDa) SRF isoform, accompanied by decreased expression of full-length SRF. By RT-PCR and Southern blot analyses, we characterized this ~52-kDa SRF isoform as being encoded by an alternatively spliced form of SRF lacking exons 4 and 5 of the SRF primary RNA transcript (SRF-Delta4,5 isoform). We cloned SRF-Delta4,5 cDNA and showed that overexpression of this isoform into cells inhibits SRF-dependent activation of cardiac muscle genes. These results suggest that expression of SRF-Delta4,5 in failing hearts may in part contribute to impaired cardiac gene expression and consequently to the pathogenesis of heart failure.
Collapse
Affiliation(s)
- Francesca J Davis
- Department of Surgery (Cardiac and Thoracic), University of Chicago, Illinois 60637, USA
| | | | | | | | | | | |
Collapse
|
39
|
Giger JM, Haddad F, Qin AX, Baldwin KM. Functional overload increases beta-MHC promoter activity in rodent fast muscle via the proximal MCAT (betae3) site. Am J Physiol Cell Physiol 2002; 282:C518-27. [PMID: 11832337 DOI: 10.1152/ajpcell.00444.2001] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Functional overload (OL) of the rat plantaris muscle by the removal of synergistic muscles induces a shift in the myosin heavy chain (MHC) isoform expression profile from the fast isoforms toward the slow type I, or, beta-MHC isoform. Different length rat beta-MHC promoters were linked to a firefly luciferase reporter gene and injected in control and OL plantaris muscles. Reporter activities of -3,500, -914, -408, and -215 bp promoters increased in response to 1 wk of OL. The smallest -171 bp promoter was not responsive to OL. Mutation analyses of putative regulatory elements within the -171 and -408 bp region were performed. The -408 bp promoters containing mutations of the betae1, distal muscle CAT (MCAT; betae2), CACC, or A/T-rich (GATA), were still responsive to OL. Only the proximal MCAT (betae3) mutation abolished the OL response. Gel mobility shift assays revealed a significantly higher level of complex formation of the betae3 probe with nuclear protein from OL plantaris compared with control plantaris. These results suggest that the betae3 site functions as a putative OL-responsive element in the rat beta-MHC gene promoter.
Collapse
Affiliation(s)
- Julia M Giger
- Department of Physiology and Biophysics, University of California-Irvine, Irvine, CA 92697, USA
| | | | | | | |
Collapse
|
40
|
Huey KA, Roy RR, Haddad F, Edgerton VR, Baldwin KM. Transcriptional regulation of the type I myosin heavy chain promoter in inactive rat soleus. Am J Physiol Cell Physiol 2002; 282:C528-37. [PMID: 11832338 DOI: 10.1152/ajpcell.00355.2001] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Chronic muscle inactivity with spinal cord isolation (SI) decreases expression of slow type I myosin heavy chain (MHC) while increasing expression of the faster MHC isoforms, primarily IIx. The purpose of this study was to determine whether type I MHC downregulation in the soleus muscle of SI rats is regulated transcriptionally and to identify cis-acting elements or regions of the rat type I MHC gene promoter involved in this response. One week of SI significantly decreased in vivo activity of the -3500-, -408-, -299-, -215-, and -171-bp type I MHC promoters. The activity of all tested deletions of the type I MHC promoter, relative to the human skeletal alpha-actin promoter, were significantly reduced in the SI soleus, except activity of the -171-bp promoter, which increased. Mutation of the betae3 element (-214/-190 bp) in the -215- and -408-bp promoters and deletion of this element (-171-bp promoter) attenuated type I downregulation with SI. Gel mobility shift assays demonstrated a decrease in transcription enhancer factor-1 binding to the betae3 element with SI, despite an increase in total binding to this region. These results demonstrate that type I MHC downregulation with SI is transcriptionally regulated and suggest that interactions between transcription enhancer factor-1 and the betae3 element are likely involved in this response.
Collapse
Affiliation(s)
- K A Huey
- Department of Physiology and Biophysics, University of California-Irvine, Irvine, CA 92697, USA
| | | | | | | | | |
Collapse
|
41
|
Jiang SW, Dong M, Trujillo MA, Miller LJ, Eberhardt NL. DNA binding of TEA/ATTS domain factors is regulated by protein kinase C phosphorylation in human choriocarcinoma cells. J Biol Chem 2001; 276:23464-70. [PMID: 11313339 DOI: 10.1074/jbc.m010934200] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Transcription enhancer factor 1 (TEF-1) controls the expression of a diverse set of genes. Previous studies implicated protein kinase C (PKC)-mediated signal transduction in modulating TEF function. We demonstrate that in human choriocarcinoma BeWo cells, the PKC activator 12-O-tetradecanoyl phorbol 13-acetate and PKC inhibitor bisindolylmaleimide reciprocally down- and up-regulate, respectively, TEF-mediated GGAATG core enhancer activity. In vitro TEF-1 phosphorylation with several PKC isozymes and phosphoamino acid analysis confirmed that TEF-1 is a potential PKC substrate. TEF-1.DNA complexes formed by BeWo nuclear extracts are supershifted by phosphoserine- and phosphothreonine- but not phosphotyrosine-specific antibodies, indicating that TEF-1 is phosphorylated in vivo at serine and threonine residues. The TEF-1 phosphorylation domain was localized to the third alpha-helix of the DNA binding domain and adjacent hinge region by phosphopeptide analysis. TEF-1 phosphorylation significantly reduced its DNA binding activity both in vitro and in vivo, providing a possible mechanism for the inhibitory action of PKC. Finally, BeWo cells contained abundant levels of gamma and delta PKC isoforms, and their overexpression resulted in even greater inhibition of GGAATG core enhancer activity after 12-O-tetradecanoyl phorbol 13-acetate treatment. These data strongly suggest that PKC-mediated phosphorylation is a key factor controlling TEF function.
Collapse
Affiliation(s)
- S W Jiang
- Department of Medicine, Mayo Clinic, Rochester, Minnesota 55905, USA
| | | | | | | | | |
Collapse
|
42
|
Gupta M, Kogut P, Davis FJ, Belaguli NS, Schwartz RJ, Gupta MP. Physical interaction between the MADS box of serum response factor and the TEA/ATTS DNA-binding domain of transcription enhancer factor-1. J Biol Chem 2001; 276:10413-22. [PMID: 11136726 DOI: 10.1074/jbc.m008625200] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Serum response factor is a MADS box transcription factor that binds to consensus sequences CC(A/T)(6)GG found in the promoter region of several serum-inducible and muscle-specific genes. In skeletal myocytes serum response factor (SRF) has been shown to heterodimerize with the myogenic basic helix-loop-helix family of factors, related to MyoD, for control of muscle gene regulation. Here we report that SRF binds to another myogenic factor, TEF-1, that has been implicated in the regulation of a variety of cardiac muscle genes. By using different biochemical assays such as affinity precipitation of protein, GST-pulldown assay, and coimmunoprecipitation of proteins, we show that SRF binds to TEF-1 both in in vitro and in vivo assay conditions. A strong interaction of SRF with TEF-1 was seen even when one protein was denatured and immobilized on nitrocellulose membrane, indicating a direct and stable interaction between SRF and TEF-1, which occurs without a cofactor. This interaction is mediated through the C-terminal subdomain of MADS box of SRF encompassing amino acids 204-244 and the putative 2nd and 3rd alpha-helix/beta-sheet configuration of the TEA/ATTS DNA-binding domain of TEF-1. In the transient transfection assay, a positive cooperative effect of SRF and TEF-1 was observed when DNA-binding sites for both factors, serum response element and M-CAT respectively, were intact; mutation of either site abolished their synergistic effect. Similarly, an SRF mutant, SRFpm-1, defective in DNA binding failed to collaborate with TEF-1 for gene regulation, indicating that the synergistic trans-activation function of SRF and TEF-1 occurs via their binding to cognate DNA-binding sites. Our results demonstrate a novel association between SRF and TEF-1 for cardiac muscle gene regulation and disclose a general mechanism by which these two super families of factors are likely to control diversified biological functions.
Collapse
Affiliation(s)
- M Gupta
- Heart Institute for Children and Department of Physiology and Biophysics, University of Illinois, Chicago 60612, USA.
| | | | | | | | | | | |
Collapse
|
43
|
Vyas DR, McCarthy JJ, Tsika GL, Tsika RW. Multiprotein complex formation at the beta myosin heavy chain distal muscle CAT element correlates with slow muscle expression but not mechanical overload responsiveness. J Biol Chem 2001; 276:1173-84. [PMID: 11010974 DOI: 10.1074/jbc.m007750200] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
To examine the role of the beta-myosin heavy chain (betaMyHC) distal muscle CAT (MCAT) element in muscle fiber type-specific expression and mechanical overload (MOV) responsiveness, we conducted transgenic and in vitro experiments. In adult transgenic mice, mutation of the distal MCAT element led to significant reductions in chloramphenicol acetyltransferase (CAT) specific activity measured in control soleus and plantaris muscles when compared with wild type transgene beta293WT but did not abolish MOV-induced CAT specific activity. Electrophoretic mobility shift assay revealed the formation of a specific low migrating nuclear protein complex (LMC) at the betaMyHC MCAT element that was highly enriched only when using either MOV plantaris or control soleus nuclear extract. Scanning mutagenesis of the betaMyHC distal MCAT element revealed that only the nucleotides comprising the core MCAT element were essential for LMC formation. The proteins within the LMC when using either MOV plantaris or control soleus nuclear extracts were antigenically related to nominal transcription enhancer factor 1 (NTEF-1), poly(ADP-ribose) polymerase (PARP), and Max. Only in vitro translated TEF-1 protein bound to the distal MCAT element, suggesting that this multiprotein complex is tethered to the DNA via TEF-1. Protein-protein interaction assays revealed interactions between nominal TEF-1, PARP, and Max. Our studies show that for transgene beta293 the distal MCAT element is not required for MOV responsiveness but suggest that a multiprotein complex likely comprised of nominal TEF-1, PARP, and Max forms at this element to contribute to basal slow fiber expression.
Collapse
Affiliation(s)
- D R Vyas
- Department of Biochemistry, School of Medicine, School of Veterinary Medicine, and the Dalton Cardiovascular Research Center, University of Missouri, Columbia, Missouri 65211, USA
| | | | | | | |
Collapse
|