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Itou T, Ishibashi Y, Oguri Y, Hashimura M, Yokoi A, Harada Y, Fukagawa N, Hayashi M, Ono M, Kusano C, Saegusa M. EBP50 Depletion and Nuclear β-Catenin Accumulation Engender Aggressive Behavior of Colorectal Carcinoma through Induction of Tumor Budding. Cancers (Basel) 2023; 16:183. [PMID: 38201610 PMCID: PMC10778391 DOI: 10.3390/cancers16010183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 12/19/2023] [Accepted: 12/25/2023] [Indexed: 01/12/2024] Open
Abstract
Ezin-radixin-moesin-binding phosphoprotein 50 (EBP50) is a scaffold protein that interacts with several partner molecules including β-catenin. Here, we examined the crosstalk between EBP50 and nuclear catenin during colorectal carcinoma (CRC) progression. In clinical samples, there were no correlations between the subcellular location of EBP50 and any clinicopathological factors. However, EBP50 expression was significantly lower specifically in the outer areas of tumor lesions, in regions where tumor budding (BD) was observed. Low EBP50 expression was also significantly associated with several unfavorable prognostic factors, suggesting that EBP50 depletion rather than its overexpression or subcellular distribution plays an important role in CRC progression. In CRC cell lines, knockout of EBP50 induced epithelial-mesenchymal transition (EMT)-like features, decreased proliferation, accelerated migration capability, and stabilized nuclear β-catenin due to disruption of the interaction between EBP50 and β-catenin at the plasma membrane. In addition, Slug expression was significantly higher in outer lesions, particularly in BD areas, and was positively correlated with nuclear β-catenin status, consistent with β-catenin-driven transactivation of the Slug promoter. Together, our data suggest that EBP50 depletion releases β-catenin from the plasma membrane in outer tumor lesions, allowing β-catenin to accumulate and translocate to the nucleus, where it transactivates the Slug gene to promote EMT. This in turn triggers tumor budding and contributes to the progression of CRC to a more aggressive phase.
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Affiliation(s)
- Takashi Itou
- Department of Pathology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan; (T.I.); (Y.I.); (Y.O.); (M.H.); (A.Y.); (Y.H.); (N.F.); (M.H.); (M.O.)
- Department of Gastroenterology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan;
| | - Yu Ishibashi
- Department of Pathology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan; (T.I.); (Y.I.); (Y.O.); (M.H.); (A.Y.); (Y.H.); (N.F.); (M.H.); (M.O.)
- Department of Gastroenterology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan;
| | - Yasuko Oguri
- Department of Pathology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan; (T.I.); (Y.I.); (Y.O.); (M.H.); (A.Y.); (Y.H.); (N.F.); (M.H.); (M.O.)
| | - Miki Hashimura
- Department of Pathology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan; (T.I.); (Y.I.); (Y.O.); (M.H.); (A.Y.); (Y.H.); (N.F.); (M.H.); (M.O.)
| | - Ako Yokoi
- Department of Pathology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan; (T.I.); (Y.I.); (Y.O.); (M.H.); (A.Y.); (Y.H.); (N.F.); (M.H.); (M.O.)
| | - Yohei Harada
- Department of Pathology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan; (T.I.); (Y.I.); (Y.O.); (M.H.); (A.Y.); (Y.H.); (N.F.); (M.H.); (M.O.)
- Department of Gastroenterology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan;
| | - Naomi Fukagawa
- Department of Pathology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan; (T.I.); (Y.I.); (Y.O.); (M.H.); (A.Y.); (Y.H.); (N.F.); (M.H.); (M.O.)
- Department of Gastroenterology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan;
| | - Misato Hayashi
- Department of Pathology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan; (T.I.); (Y.I.); (Y.O.); (M.H.); (A.Y.); (Y.H.); (N.F.); (M.H.); (M.O.)
| | - Mototsugu Ono
- Department of Pathology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan; (T.I.); (Y.I.); (Y.O.); (M.H.); (A.Y.); (Y.H.); (N.F.); (M.H.); (M.O.)
| | - Chika Kusano
- Department of Gastroenterology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan;
| | - Makoto Saegusa
- Department of Pathology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan; (T.I.); (Y.I.); (Y.O.); (M.H.); (A.Y.); (Y.H.); (N.F.); (M.H.); (M.O.)
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Gupta DP, Bhusal A, Rahman MH, Kim JH, Choe Y, Jang J, Jung HJ, Kim UK, Park JS, Maeng LS, Suk K, Song GJ. EBP50 is a key molecule for the Schwann cell-axon interaction in peripheral nerves. Prog Neurobiol 2023; 231:102544. [PMID: 37940033 DOI: 10.1016/j.pneurobio.2023.102544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 10/25/2023] [Accepted: 11/02/2023] [Indexed: 11/10/2023]
Abstract
Peripheral nerve injury disrupts the Schwann cell-axon interaction and the cellular communication between them. The peripheral nervous system has immense potential for regeneration extensively due to the innate plastic potential of Schwann cells (SCs) that allows SCs to interact with the injured axons and exert specific repair functions essential for peripheral nerve regeneration. In this study, we show that EBP50 is essential for the repair function of SCs and regeneration following nerve injury. The increased expression of EBP50 in the injured sciatic nerve of control mice suggested a significant role in regeneration. The ablation of EBP50 in mice resulted in delayed nerve repair, recovery of behavioral function, and remyelination following nerve injury. EBP50 deficiency led to deficits in SC functions, including proliferation, migration, cytoskeleton dynamics, and axon interactions. The adeno-associated virus (AAV)-mediated local expression of EBP50 improved SCs migration, functional recovery, and remyelination. ErbB2-related proteins were not differentially expressed in EBP50-deficient sciatic nerves following injury. EBP50 binds and stabilizes ErbB2 and activates the repair functions to promote regeneration. Thus, we identified EBP50 as a potent SC protein that can enhance the regeneration and functional recovery driven by NRG1-ErbB2 signaling, as well as a novel regeneration modulator capable of potential therapeutic effects.
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Affiliation(s)
- Deepak Prasad Gupta
- Translational Brain Research Center, International St. Mary's Hospital, Catholic Kwandong University, Incheon, Republic of Korea; Department of Pharmacology, Brain Science and Engineering Institute, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - Anup Bhusal
- Department of Pharmacology, Brain Science and Engineering Institute, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - Md Habibur Rahman
- Department of Neurology, The Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Jae-Hong Kim
- Department of Pharmacology, Brain Science and Engineering Institute, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - Youngshik Choe
- Korea Brain Research Institute, Daegu, Republic of Korea
| | - Jaemyung Jang
- Korea Brain Research Institute, Daegu, Republic of Korea
| | - Hyun Jin Jung
- Korea Brain Research Institute, Daegu, Republic of Korea
| | - Un-Kyung Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - Jin-Sung Park
- Department of Neurology, School of Medicine, Kyungpook National University, Kyungpook National University Chilgok Hospital, Daegu, Republic of Korea
| | - Lee-So Maeng
- Department of Hospital Pathology, Incheon St. Mary's Hospital College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Kyoungho Suk
- Department of Pharmacology, Brain Science and Engineering Institute, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - Gyun Jee Song
- Translational Brain Research Center, International St. Mary's Hospital, Catholic Kwandong University, Incheon, Republic of Korea; Department of Medicine, College of Medicine, Catholic Kwandong University, Gangneung, Gangwon-do, Republic of Korea.
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3
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Nakagawa M, Matsumoto T, Yokoi A, Hashimura M, Oguri Y, Konno R, Ishibashi Y, Ito T, Ohhigata K, Harada Y, Fukagawa N, Kodera Y, Saegusa M. Interaction between membranous EBP50 and myosin 9 as a favorable prognostic factor in ovarian clear cell carcinoma. Mol Oncol 2023; 17:2168-2182. [PMID: 37539980 PMCID: PMC10552901 DOI: 10.1002/1878-0261.13503] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 06/29/2023] [Accepted: 08/01/2023] [Indexed: 08/05/2023] Open
Abstract
Ezrin-radixin-moesin-binding phosphoprotein 50 (EBP50) is a scaffold protein that is required for epithelial polarity. Knockout (KO) of membranous EBP50 (Me-EBP50) in ovarian clear cell carcinoma (OCCC) cells induced an epithelial-mesenchymal transition (EMT)-like phenotype, along with decreased proliferation, accelerated migration capability, and induction of cancer stem cell (CSC)-like properties. Shotgun proteomics analysis of proteins that co-immunoprecipitated with EBP50 revealed that Me-EBP50 strongly interacts with myosin 9 (MYH9). Specific inhibition of MYH9 with blebbistatin phenocopied Me-EBP50 KO, and blebbistatin treatment potentiated the effects of Me-EBP50 KO. In OCCC cells from clinical samples, Me-EBP50 and MYH9 were co-localized at the apical plasma membrane. Patients with a combination of Me-EBP50-high and MYH9-high scores had the best prognosis for overall and progression-free survival. Our data suggest that Me-EBP50 has tumor-suppressive effects through the establishment and maintenance of epithelial polarization. By contrast, loss of Me-EBP50 expression induces EMT-like phenotypes, probably due to MYH9 dysfunction; this results in increased cell mobility and enhanced CSC-like properties, which in turn promote OCCC progression.
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Affiliation(s)
- Mayu Nakagawa
- Department of PathologyKitasato University School of MedicineSagamiharaJapan
| | - Toshihide Matsumoto
- Department of PathologyKitasato University School of Allied Health ScienceSagamiharaJapan
| | - Ako Yokoi
- Department of PathologyKitasato University School of MedicineSagamiharaJapan
| | - Miki Hashimura
- Department of PathologyKitasato University School of MedicineSagamiharaJapan
| | - Yasuko Oguri
- Department of PathologyKitasato University School of MedicineSagamiharaJapan
| | - Ryo Konno
- Center for Disease Proteomics, School of ScienceKitasato UniversitySagamiharaJapan
| | - Yu Ishibashi
- Department of PathologyKitasato University School of MedicineSagamiharaJapan
| | - Takashi Ito
- Department of PathologyKitasato University School of MedicineSagamiharaJapan
| | - Kensuke Ohhigata
- Department of PathologyKitasato University School of MedicineSagamiharaJapan
| | - Yohei Harada
- Department of PathologyKitasato University School of MedicineSagamiharaJapan
| | - Naomi Fukagawa
- Department of PathologyKitasato University School of MedicineSagamiharaJapan
| | - Yoshio Kodera
- Center for Disease Proteomics, School of ScienceKitasato UniversitySagamiharaJapan
| | - Makoto Saegusa
- Department of PathologyKitasato University School of MedicineSagamiharaJapan
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Yokoi A, Minami M, Hashimura M, Oguri Y, Matsumoto T, Hasegawa Y, Nakagawa M, Ishibashi Y, Ito T, Ohhigata K, Harada Y, Fukagawa N, Saegusa M. PTEN overexpression and nuclear β-catenin stabilization promote morular differentiation through induction of epithelial-mesenchymal transition and cancer stem cell-like properties in endometrial carcinoma. Cell Commun Signal 2022; 20:181. [PMID: 36411429 DOI: 10.1186/s12964-022-00999-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 10/23/2022] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Although a lack of functional PTEN contributes to tumorigenesis in a wide spectrum of human malignancies, little is known about the functional role of its overexpression in the tumors. The current study focused on PTEN overexpression in endometrial carcinoma (Em Ca). METHODS The functional impact of PTEN overexpression was assessed by Em Ca cell lines. Immunohistochemical analyses were also conducted using 38 Em Ca with morular lesions. RESULTS Em Ca cell lines stably overexpressing PTEN (H6-PTEN) exhibited epithelial-mesenchymal transition (EMT)-like features, probably through β-catenin/Slug-meditated suppression of E-cadherin. PTEN overexpression also inhibited cell proliferation, accelerated cellular senescence, increased apoptotic features, and enhanced migration capability. Moreover, H6-PTEN cells exhibited cancer stem cell (CSC)-like properties, along with high expression of aldehyde dehydrogenase 1 and CD44s, a large ALDH 1high population, enriched spheroid formation, and β-catenin-mediated upregulation of cyclin D2, which is required for persistent CSC growth. In clinical samples, immunoreactivities for PTEN, as well as CSC-related molecules, were significantly higher in morular lesions as compared to the surrounding carcinomas. PTEN score was positively correlated with expression of nuclear β-catenin, cytoplasmic CD133, and CD44v6, and negatively with cell proliferation. Finally, estrogen receptor-α (ERα)-dependent expression of Ezrin-radixin-moesin-binding phophoprotein-50 (EBP50), a multifunctional scaffolding protein, acts as a negative regulator of morular formation by Em Ca cells through interacting with PTEN and β-catenin. CONCLUSION In the abscess of ERα/EBP50 expression, PTEN overexpression and nuclear β-catenin stabilization promote the establishment and maintenance of morular phenotype associated with EMT/CSC-like features in Em Ca cells. Video Abstract.
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5
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Sepers JJ, Ramalho JJ, Kroll JR, Schmidt R, Boxem M. ERM-1 Phosphorylation and NRFL-1 Redundantly Control Lumen Formation in the C. elegans Intestine. Front Cell Dev Biol 2022; 10:769862. [PMID: 35198555 PMCID: PMC8860247 DOI: 10.3389/fcell.2022.769862] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 01/04/2022] [Indexed: 11/13/2022] Open
Abstract
Reorganization of the plasma membrane and underlying actin cytoskeleton into specialized domains is essential for the functioning of most polarized cells in animals. Proteins of the ezrin-radixin-moesin (ERM) and Na+/H+ exchanger 3 regulating factor (NHERF) family are conserved regulators of cortical specialization. ERM proteins function as membrane-actin linkers and as molecular scaffolds that organize the distribution of proteins at the membrane. NHERF proteins are PDZ-domain containing adapters that can bind to ERM proteins and extend their scaffolding capability. Here, we investigate how ERM and NHERF proteins function in regulating intestinal lumen formation in the nematode Caenorhabditis elegans. C. elegans has single ERM and NHERF family proteins, termed ERM-1 and NRFL-1, and ERM-1 was previously shown to be critical for intestinal lumen formation. Using CRISPR/Cas9-generated nrfl-1 alleles we demonstrate that NRFL-1 localizes at the intestinal microvilli, and that this localization is depended on an interaction with ERM-1. However, nrfl-1 loss of function mutants are viable and do not show defects in intestinal development. Interestingly, combining nrfl-1 loss with erm-1 mutants that either block or mimic phosphorylation of a regulatory C-terminal threonine causes severe defects in intestinal lumen formation. These defects are not observed in the phosphorylation mutants alone, and resemble the effects of strong erm-1 loss of function. The loss of NRFL-1 did not affect the localization or activity of ERM-1. Together, these data indicate that ERM-1 and NRFL-1 function together in intestinal lumen formation in C. elegans. We postulate that the functioning of ERM-1 in this tissue involves actin-binding activities that are regulated by the C-terminal threonine residue and the organization of apical domain composition through NRFL-1.
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Affiliation(s)
- Jorian J Sepers
- Division of Developmental Biology, Department of Biology, Faculty of Science, Institute of Biodynamics and Biocomplexity, Utrecht University, Utrecht, Netherlands
| | - João J Ramalho
- Division of Developmental Biology, Department of Biology, Faculty of Science, Institute of Biodynamics and Biocomplexity, Utrecht University, Utrecht, Netherlands.,Laboratory of Biochemistry, Wageningen University and Research, Wageningen, Netherlands
| | - Jason R Kroll
- Division of Developmental Biology, Department of Biology, Faculty of Science, Institute of Biodynamics and Biocomplexity, Utrecht University, Utrecht, Netherlands
| | - Ruben Schmidt
- Division of Developmental Biology, Department of Biology, Faculty of Science, Institute of Biodynamics and Biocomplexity, Utrecht University, Utrecht, Netherlands
| | - Mike Boxem
- Division of Developmental Biology, Department of Biology, Faculty of Science, Institute of Biodynamics and Biocomplexity, Utrecht University, Utrecht, Netherlands
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6
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Khan K, Long B, Baleanu-Gogonea C, Gogonea V, Deshpande GM, Vasu K, Fox PL. Cotranslational interaction of human EBP50 and ezrin overcomes masked binding site during complex assembly. Proc Natl Acad Sci U S A 2022; 119:e2115799119. [PMID: 35140182 DOI: 10.1073/pnas.2115799119] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/23/2021] [Indexed: 12/13/2022] Open
Abstract
Multiprotein assemblages are the intracellular workhorses of many physiological processes. Assembly of constituents into complexes can be driven by stochastic, domain-dependent, posttranslational events in which mature, folded proteins specifically interact. However, inaccessibility of interacting surfaces in mature proteins (e.g., due to "buried" domains) can obstruct complex formation. Mechanisms by which multiprotein complex constituents overcome topological impediments remain enigmatic. For example, the heterodimeric complex formed by EBP50 and ezrin must address this issue as the EBP50-interacting domain in ezrin is obstructed by a self-interaction that occupies the EBP50 binding site. Here, we show that the EBP50-ezrin complex is formed by a cotranslational mechanism in which the C terminus of mature, fully formed EBP50 binds the emerging, ribosome-bound N-terminal FERM domain of ezrin during EZR mRNA translation. Consistent with this observation, a C-terminal EBP50 peptide mimetic reduces the cotranslational interaction and abrogates EBP50-ezrin complex formation. Phosphorylation of EBP50 at Ser339 and Ser340 abrogates the cotranslational interaction and inhibits complex formation. In summary, we show that the function of eukaryotic mRNA translation extends beyond "simple" generation of a linear peptide chain that folds into a tertiary structure, potentially for subsequent complex assembly; importantly, translation can facilitate interactions with sterically inaccessible domains to form functional multiprotein complexes.
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7
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Capdevielle C, Desplat A, Charpentier J, Sagliocco F, Thiebaud P, Thézé N, Fédou S, Hooks KB, Silvestri R, Guyonnet-Duperat V, Petrel M, Raymond AA, Dupuy JW, Grosset CF, Hagedorn M. HDAC inhibition induces expression of scaffolding proteins critical for tumor progression in pediatric glioma: focus on EBP50 and IRSp53. Neuro Oncol 2020; 22:550-562. [PMID: 31711240 DOI: 10.1093/neuonc/noz215] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Diffuse midline glioma (DMG) is a pediatric malignancy with poor prognosis. Most children die less than one year after diagnosis. Recently, mutations in histone H3 have been identified and are believed to be oncogenic drivers. Targeting this epigenetic abnormality using histone deacetylase (HDAC) inhibitors such as panobinostat (PS) is therefore a novel therapeutic option currently evaluated in clinical trials. METHODS BH3 profiling revealed engagement in an irreversible apoptotic process of glioma cells exposed to PS confirmed by annexin-V/propidium iodide staining. Using proteomic analysis of 3 DMG cell lines, we identified 2 proteins deregulated after PS treatment. We investigated biological effects of their downregulation by silencing RNA but also combinatory effects with PS treatment in vitro and in vivo using a chick embryo DMG model. Electron microscopy was used to validate protein localization. RESULTS Scaffolding proteins EBP50 and IRSp53 were upregulated by PS treatment. Reduction of these proteins in DMG cell lines leads to blockade of proliferation and migration, invasion, and an increase of apoptosis. EBP50 was found to be expressed in cytoplasm and nucleus in DMG cells, confirming known oncogenic locations of the protein. Treatment of glioma cells with PS together with genetic or chemical inhibition of EBP50 leads to more effective reduction of cell growth in vitro and in vivo. CONCLUSION Our data reveal a specific relation between HDAC inhibitors and scaffolding protein deregulation which might have a potential for therapeutic intervention for cancer treatment.
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Affiliation(s)
- Caroline Capdevielle
- National Institute of Health and Medical Research (INSERM) Unit 1035, MicroRNAs in Cancer and Development (miRCADE) team, Bordeaux, France.,University of Bordeaux, Bordeaux, France
| | - Angélique Desplat
- National Institute of Health and Medical Research (INSERM) Unit 1035, MicroRNAs in Cancer and Development (miRCADE) team, Bordeaux, France
| | - Justine Charpentier
- National Institute of Health and Medical Research (INSERM) Unit 1035, MicroRNAs in Cancer and Development (miRCADE) team, Bordeaux, France.,University of Bordeaux, Bordeaux, France
| | - Francis Sagliocco
- National Institute of Health and Medical Research (INSERM) Unit 1035, MicroRNAs in Cancer and Development (miRCADE) team, Bordeaux, France.,University of Bordeaux, Bordeaux, France
| | - Pierre Thiebaud
- INSERM Unit 1035 Dermatology team, Bordeaux, France.,XenoFish Platform, University of Bordeaux, Bordeaux, France.,University of Bordeaux, Bordeaux, France
| | - Nadine Thézé
- INSERM Unit 1035 Dermatology team, Bordeaux, France.,XenoFish Platform, University of Bordeaux, Bordeaux, France.,University of Bordeaux, Bordeaux, France
| | - Sandrine Fédou
- INSERM Unit 1035 Dermatology team, Bordeaux, France.,XenoFish Platform, University of Bordeaux, Bordeaux, France.,University of Bordeaux, Bordeaux, France
| | - Katarzyna B Hooks
- National Institute of Health and Medical Research (INSERM) Unit 1035, MicroRNAs in Cancer and Development (miRCADE) team, Bordeaux, France.,University of Bordeaux, Bordeaux, France
| | - Romano Silvestri
- Department of Drug Chemistry and Technologies, Sapienza University of Rome, Rome, Italy
| | | | - Melina Petrel
- Bordeaux Imaging Center, University of Bordeaux, Bordeaux, France
| | - Anne-Aurélie Raymond
- National Institute of Health and Medical Research (INSERM) Unit 1035, MicroRNAs in Cancer and Development (miRCADE) team, Bordeaux, France.,University of Bordeaux, Bordeaux, France.,Oncoprot, Bordeaux, France
| | - Jean-William Dupuy
- University of Bordeaux, Bordeaux, France.,Proteomics Platform, Bordeaux Functional Genomics Center, University of Bordeaux, Bordeaux, France
| | - Christophe F Grosset
- National Institute of Health and Medical Research (INSERM) Unit 1035, MicroRNAs in Cancer and Development (miRCADE) team, Bordeaux, France.,University of Bordeaux, Bordeaux, France
| | - Martin Hagedorn
- National Institute of Health and Medical Research (INSERM) Unit 1035, MicroRNAs in Cancer and Development (miRCADE) team, Bordeaux, France.,University of Bordeaux, Bordeaux, France
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8
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Song GJ, Gupta DP, Rahman MH, Park HT, Al Ghouleh I, Bisello A, Lee MG, Park JY, Park HH, Jun JH, Chung KW, Choi BO, Suk K. Loss-of-function of EBP50 is a new cause of hereditary peripheral neuropathy: EBP50 functions in peripheral nerve system. Glia 2020; 68:1794-1809. [PMID: 32077526 DOI: 10.1002/glia.23805] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 02/04/2020] [Accepted: 02/07/2020] [Indexed: 12/12/2022]
Abstract
Finding causative genetic mutations is important in the diagnosis and treatment of hereditary peripheral neuropathies. This study was conducted to find new genes involved in the pathophysiology of hereditary peripheral neuropathy. We identified a new mutation in the EBP50 gene, which is co-segregated with neuropathic phenotypes, including motor and sensory deficit in a family with Charcot-Marie-Tooth disease. EBP50 is known to be important for the formation of microvilli in epithelial cells, and the discovery of this gene mutation allowed us to study the function of EBP50 in the nervous system. EBP50 was strongly expressed in the nodal and paranodal regions of sciatic nerve fibers, where Schwann cell microvilli contact the axolemma, and at the growth tips of primary Schwann cells. In addition, EBP50 expression was decreased in mouse models of peripheral neuropathy. Knockout mice were used to study EBP50 function in the peripheral nervous system. Interestingly motor function deficit and abnormal histology of nerve fibers were observed in EBP50+/- heterozygous mice at 12 months of age, but not 3 months. in vitro studies using Schwann cells showed that NRG1-induced AKT activation and migration were significantly reduced in cells overexpressing the I325V mutant of EBP50 or cells with knocked-down EBP50 expression. In conclusion, we show for the first time that loss of function due to EBP50 gene deficiency or mutation can cause peripheral neuropathy.
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Affiliation(s)
- Gyun Jee Song
- Department of Medical Science, Institute for Bio-Medical Convergence, Catholic Kwandong University, International St. Mary's Hospital, Incheon, Republic of Korea
| | - Deepak Prasad Gupta
- Department of Pharmacology, Brain Science and Engineering Institute, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - Md Habibur Rahman
- Department of Pharmacology, Brain Science and Engineering Institute, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - Hwan Tae Park
- Department of Molecular Neuroscience, College of Medicine, Dong-A University, Busan, Republic of Korea
| | - Imad Al Ghouleh
- Division of Cardiology, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | - Alessandro Bisello
- Department of Pharmacology and Chemical Biology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Maan-Gee Lee
- Department of Pharmacology, Brain Science and Engineering Institute, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - Jae-Yong Park
- School of Biosystems and Biomedical Sciences, College of Health Sciences, Korea University, Seoul, Republic of Korea
| | - Hyun Ho Park
- College of Pharmacy, Chung-Ang University, Seoul, Republic of Korea
| | - Jin Hyun Jun
- Department of Senior Healthcare, BK21 Plus Program, Graduate School of Eulji University, Department of Biomedical Laboratory Science, College of Health Science, Eulji University, Seongnam, Republic of Korea
| | - Ki Wha Chung
- Department of Biological Sciences, Kongju National University, Gongju, Republic of Korea
| | - Byung-Ok Choi
- Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Kyoungho Suk
- Department of Pharmacology, Brain Science and Engineering Institute, BK21 Plus KNU Biomedical Convergence Program, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
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9
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Pera T, Tompkins E, Katz M, Wang B, Deshpande DA, Weinman EJ, Penn RB. Specificity of NHERF1 regulation of GPCR signaling and function in human airway smooth muscle. FASEB J 2019; 33:9008-9016. [PMID: 31042404 PMCID: PMC6662985 DOI: 10.1096/fj.201900323r] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 04/08/2019] [Indexed: 12/21/2022]
Abstract
Na+/H+ exchanger regulatory factor 1 (NHERF1; also known as ezrin-radixin-moesin-binding phosphoprotein 50) is a PSD-95, disc large, zona occludens-1 adapter that acts as a scaffold for signaling complexes and cytoskeletal-plasma membrane interactions. NHERF1 is crucial to β-2-adrenoceptor (β2AR)-mediated activation of cystic fibrosis transmembrane conductance regulator (CFTR) in epithelial cells, and NHERF1 has been proposed to mediate the recycling of internalized β2AR back to the cell membrane. In the current study, we assessed the role of NHERF1 in regulating cAMP-mediated signaling and immunomodulatory functions in airway smooth muscle (ASM). NHERF1 knockdown attenuated the induction of (protein kinase A) phospho-vasodilator-stimulated phosphoprotein (p-VASP) by isoproterenol (ISO), prostaglandin E2 (PGE2), or forskolin (FSK) as well as the induction of p-heat shock protein 20 after 4 h of stimulation with ISO and FSK. NHERF1 knockdown fully abrogated the ISO-, PGE2-, and FSK-induced IL-6 gene expression and cytokine production without affecting cAMP-mediated phosphodiesterase 4D (PDE4D) gene expression, phospho-cAMP response element-binding protein (p-CREB), and cAMP response element (CRE)-Luc, or PDGF-induced cyclin D1 expression. Interestingly, NHERF1 knockdown prevented ISO-induced chromatin-binding of the transcription factor CCAAT-enhancer-binding protein-β (c/EBPβ). c/EBPβ knockdown almost completely abrogated the cAMP-mediated IL-6 but not PDE4D gene expression. The differential regulation of cAMP-induced signaling and gene expression in our study indicates a role for NHERF1 in the compartmentalization of cAMP signaling in ASM.-Pera, T., Tompkins, E., Katz, M., Wang, B., Deshpande, D. A., Weinman, E. J., Penn, R. B. Specificity of NHERF1 regulation of GPCR signaling and function in human airway smooth muscle.
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Affiliation(s)
- Tonio Pera
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Center for Translational Medicine, The Jane and Leonard Korman Respiratory Institute, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Eric Tompkins
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Center for Translational Medicine, The Jane and Leonard Korman Respiratory Institute, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Michael Katz
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Center for Translational Medicine, The Jane and Leonard Korman Respiratory Institute, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Bin Wang
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Center for Translational Medicine, The Jane and Leonard Korman Respiratory Institute, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Deepak A. Deshpande
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Center for Translational Medicine, The Jane and Leonard Korman Respiratory Institute, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Edward J. Weinman
- Department of Medicine, University of Maryland, Baltimore, Maryland, USA
| | - Raymond B. Penn
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Center for Translational Medicine, The Jane and Leonard Korman Respiratory Institute, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
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10
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Feng Y, Niu R, Cheng X, Wang K, Du Y, Peng X, Chen F. ATPR-induced differentiation and G0/G1 phase arrest in acute promyelocytic leukemia by repressing EBP50/NCF1 complex to promote the production of ROS. Toxicol Appl Pharmacol 2019; 379:114638. [PMID: 31254567 DOI: 10.1016/j.taap.2019.114638] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 06/18/2019] [Accepted: 06/21/2019] [Indexed: 12/11/2022]
Abstract
Our previous study has demonstrated that 4-amino-2-trifluoromethyl-phenyl Retinate (ATPR) can induce human leukemia NB4 cells differentiation and G0/G1 phase arrest, but the underlying mechanism is still unclear. In this study, we used proteomics to screen differentially expressed protein profiles in NB4 cells before and after ATPR treatment in vitro. We analyzed the peptides digested from total cellular proteins by reverse phase LC-MS/MS and then performed label-free quantitative analysis. We found 27 significantly up-regulated proteins in the ATPR group compared to the control group. NCF1 was the most significantly changed protein. Immunoprecipitation and double immunofluorescent staining showed that EBP50 bind to NCF1. We further explored the potential molecular mechanism of EBP50/NCF1 complex in ATPR-induced differentiation and G0/G1 phase arrest. The results showed that ATPR remarkably reduced the expression of EBP50 in vivo and in vitro. Interestingly, the reduction of EBP50 contributed to ROS release by modulating the subcellular localization of NCF1. The reduction of EBP50 also contributed to G0/G1 phase arrest by inhibiting CyclinD1, CyclinA2 and CDK4, as well as promoting the differentiation of NB4 cells by increasing the expression of CD11b. Furthermore, we found that the overexpression of EBP50 restrained the effects of ATPR on differentiation and G0/G1 phase arrest in NB4 cells. These results suggest that ATPR-induced differentiation and G0/G1 phase arrest in acute promyelocytic leukemia (APL) by repressing EBP50/NCF1 complex to promote the production of ROS, and the results from in vivo experiments were consistent with those from in vitro studies. Therefore, our finding results suggest that EBP50 may be a new target for ATPR in the treatment of APL.
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Affiliation(s)
- Yubin Feng
- The Key Laboratory of Major Autoimmune Diseases of Anhui Province, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, Anhui, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, Anhui, China
| | - Ruowen Niu
- The Key Laboratory of Major Autoimmune Diseases of Anhui Province, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, Anhui, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, Anhui, China
| | - Xin Cheng
- The Key Laboratory of Major Autoimmune Diseases of Anhui Province, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, Anhui, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, Anhui, China
| | - Ke Wang
- The Key Laboratory of Major Autoimmune Diseases of Anhui Province, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, Anhui, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, Anhui, China
| | - Yan Du
- The Key Laboratory of Major Autoimmune Diseases of Anhui Province, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, Anhui, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, Anhui, China
| | - Xiaoqing Peng
- The Key Laboratory of Major Autoimmune Diseases of Anhui Province, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, Anhui, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, Anhui, China
| | - Feihu Chen
- The Key Laboratory of Major Autoimmune Diseases of Anhui Province, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, Anhui, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, Anhui, China.
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11
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Wang Q, Song R, Zhao C, Liu H, Yang Y, Gu S, Feng D, He J. HPV16 E6 promotes cervical cancer cell migration and invasion by downregulation of NHERF1. Int J Cancer 2018; 144:1619-1632. [PMID: 30230542 DOI: 10.1002/ijc.31876] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 07/29/2018] [Accepted: 09/03/2018] [Indexed: 12/21/2022]
Abstract
HPV16 is the predominant type of HPV causing invasive cervical cancer. However, the underlying molecular mechanism of the unparalleled carcinogenic power of HPV16 compared to other types of high-risk (HR)-HPV including HPV18 remains elusive. The PDZ binding motif (PBM) of high-risk HPV E6 plays an important role in neoplasia and progression of cervical cancer. HPV16 E6 rather than HPV18 E6, interacted with NHERF1 by its PBM region, and induced degradation of NHERF1. NHERF1 retarded the assembly of cytoskeleton by downregulation of ACTN4, thereby inhibited the migration and invasion of cervical cancer cells in both cell and mouse model. HPV16 E6 was confirmed to enhance actin polymerization with increased ACTN4 level by downregulation of NHERF1, and result in enhanced migration and invasion of cervical cancer cells. GSEA analysis of cervical cancer specimens also showed that HPV16 E6 rather than HPV18 E6, was significantly associated with actin cytoskeleton assembly. That downregulation of NHERF1 by HPV16 E6 promoted cytoskeleton assembly and cell invasion, was an important cause in cervical cancer carcinogenesis. These findings provided the differential mechanism between HPV16 E6 and HPV18 E6 in the development and progression of cervical cancer, which may partially explain the differences of carcinogenic power between these two types of HR-HPVs.
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Affiliation(s)
- Qiqi Wang
- Department of Biochemistry and Molecular Biology, Beijing Key Laboratory for Tumor Invasion and Metastasis, Capital Medical University, Beijing, People's Republic of China
| | - Ran Song
- Department of Biochemistry and Molecular Biology, Beijing Key Laboratory for Tumor Invasion and Metastasis, Capital Medical University, Beijing, People's Republic of China
| | - Chunjuan Zhao
- Department of Biochemistry and Molecular Biology, Beijing Key Laboratory for Tumor Invasion and Metastasis, Capital Medical University, Beijing, People's Republic of China
| | - Hua Liu
- Department of Biochemistry and Molecular Biology, Beijing Key Laboratory for Tumor Invasion and Metastasis, Capital Medical University, Beijing, People's Republic of China
| | - Ying Yang
- Core Facilities Center, Capital Medical University, Beijing, People's Republic of China
| | - Siyu Gu
- Department of Biochemistry and Molecular Biology, Beijing Key Laboratory for Tumor Invasion and Metastasis, Capital Medical University, Beijing, People's Republic of China
| | - Duiping Feng
- Department of Interventional Radiology, First Hospital of Shanxi Medical University, Taiyuan, People's Republic of China
| | - Junqi He
- Department of Biochemistry and Molecular Biology, Beijing Key Laboratory for Tumor Invasion and Metastasis, Capital Medical University, Beijing, People's Republic of China
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12
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Greco MR, Bon E, Rubino R, Guerra L, Bernabe-Garcia M, Cannone S, Cayuela ML, Ciaccia L, Marionneau-Lambot S, Oullier T, Fromont G, Guibon R, Roger S, Reshkin SJ, Cardone RA. Phosphorylation of NHERF1 S279 and S301 differentially regulates breast cancer cell phenotype and metastatic organotropism. Biochim Biophys Acta Mol Basis Dis 2019; 1865:26-37. [PMID: 30326259 DOI: 10.1016/j.bbadis.2018.10.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 09/21/2018] [Accepted: 10/11/2018] [Indexed: 02/08/2023]
Abstract
Metastatic cancer cells are highly plastic for the expression of different tumor phenotype hallmarks and organotropism. This plasticity is highly regulated but the dynamics of the signaling processes orchestrating the shift from one cell phenotype and metastatic organ pattern to another are still largely unknown. The scaffolding protein NHERF1 has been shown to regulate the expression of different neoplastic phenotypes through its PDZ domains, which forms the mechanistic basis for metastatic organotropism. This reprogramming activity was postulated to be dependent on its differential phosphorylation patterns. Here, we show that NHERF1 phosphorylation on S279/S301 dictates several tumor phenotypes such as in vivo invasion, NHE1-mediated matrix digestion, growth and vasculogenic mimicry. Remarkably, injecting mice with cells having differential NHERF1 expression and phosphorylation drove a shift from the predominantly lung colonization (WT NHERF1) to predominately bone colonization (double S279A/S301A mutant), indicating that NHERF1 phosphorylation also acts as a signaling switch in metastatic organotropism.
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13
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Shankar A, Crouch DH, Macluskey M. Ezrin-Radixin-Moesin Binding Phosphoprotein 50: A Potential Novel Biomarker in Human Papilloma Virus-Associated Head and Neck Squamous Cell Carcinomas. Head Neck Pathol 2018; 13:188-197. [PMID: 29846905 PMCID: PMC6513826 DOI: 10.1007/s12105-018-0937-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Accepted: 05/23/2018] [Indexed: 12/18/2022]
Abstract
High-risk human papilloma virus (HR-HPV) has increasingly been associated with head and neck squamous cell carcinoma (HNSCC), in particular oropharyngeal cancers. Ezrin-Radixin-Moesin Binding Phosphoprotein 50 (EBP50), a putative tumour suppressor, localises to the plasma membrane in suprabasal epithelium and to the cytoplasm in proliferative basal layers, and is a target for degradation by the HR-HPV E6 oncoprotein. The aim of this study was to investigate EBP50 protein expression patterns in HNSCC in a large Scottish cohort to determine if there was a correlation with HPV status and clinical outcomes. EBP50 expression patterns were assessed in 156 HNSCC including oropharyngeal (37.8%), laryngeal (24%), oral (19%) and other sites (18.5%), which were genotyped for presence of HR-HPV. HNSCC were generally negative for membranous EBP50. EBP50 expression was either cytoplasmic/absent, being 'predominantly cytoplasmic' in 76 (49%), 'weak/negligible cytoplasmic' in 44 (28%), 'strongly cytoplasmic' in 5 (3%), 'heterogeneous' in 26 (17%) and 'other' in 5 (3%) samples. Forty tumours (25%) were positive for HPV DNA, predominantly HR-HPV 16, and 44 (28%) were p16 positive. The majority of tumours (71%) with 'weak/negligible cytoplasmic' EBP50 expression originated in the oropharynx were more likely to have positive neck nodes, overexpression of p16 and positive tumour HR-HPV status (P < 0.001). Differences in EBP50 levels between oropharyngeal and non-oropharyngeal tumours may be linked to degradation of EBP50 by HR-HPV, and loss of EBP50 may therefore be a surrogate biomarker for HR-HPV infection in oropharyngeal tumours.
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Affiliation(s)
- Athiva Shankar
- 0000 0004 0397 2876grid.8241.fUnit of Oral Surgery and Medicine, University of Dundee Dental School, Park Place, Dundee, DD1 4HN UK
| | - Dorothy H. Crouch
- 0000 0004 0397 2876grid.8241.fUnit of Oral Surgery and Medicine, University of Dundee Dental School, Park Place, Dundee, DD1 4HN UK
| | - Michaelina Macluskey
- 0000 0004 0397 2876grid.8241.fUnit of Oral Surgery and Medicine, University of Dundee Dental School, Park Place, Dundee, DD1 4HN UK
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14
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Meng R, Qin Q, Xiong Y, Wang Y, Zheng J, Zhao Y, Tao T, Wang Q, Liu H, Wang S, Jiang WG, He J. NHERF1, a novel GPER associated protein, increases stability and activation of GPER in ER-positive breast cancer. Oncotarget 2018; 7:54983-54997. [PMID: 27448983 PMCID: PMC5342396 DOI: 10.18632/oncotarget.10713] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 06/12/2016] [Indexed: 11/25/2022] Open
Abstract
G protein-coupled estrogen receptor (GPER) plays an important role in mediating the effects of estradiol. High levels of GPER have been implicated to associate with the malignant progress of invasive breast cancer (IBC). However, the mechanisms by which GPER protein levels were regulated remain unclear. In this study, PDZ protein Na+/H+ exchanger regulatory factor (NHERF1) was found to interact with GPER in breast cancer cells. This interaction was mediated by the PDZ2 domain of NHERF1 and the carboxyl terminal PDZ binding motif of GPER. NHERF1 was demonstrated to facilitate GPER expression at post-transcriptional level and improve GPER protein stability by inhibiting the receptor degradation via ubiquitin-proteasome pathway in a GPER/NHERF1 interaction-dependent manner. In addition, GPER protein levels are positively associated with NHERF1 protein levels in a panel of estrogen receptor (ER)-positive breast cancer cells. Furthermore, analysis of clinical IBC data from The Cancer Genome Atlas (TCGA) showed no significant difference in GPER mRNA levels between ER-positive IBC and normal breast tissues. However, gene set enrichment analysis (GSEA) showed that GPER signaling is ultra-activated in ER-positive IBC when compared with normal and its activation is positively associated with NHERF1 mRNA levels. Taken together, our findings identify NHERF1 as a new binding partner for GPER and its overexpression promotes protein stability and activation of GPER in ER-positive IBC. Our data indicate that regulation of GPER stability by NHERF1 may contribute to GPER-mediated carcinogenesis in ER-positive IBC.
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Affiliation(s)
- Ran Meng
- Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China
| | - Qiong Qin
- Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China.,Beijing Key Laboratory for Tumor Invasion and Metastasis, Beijing International Cooperation Base for Science and Technology on China-UK Cancer Research, Beijing, China
| | - Ying Xiong
- Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China.,Beijing Key Laboratory for Tumor Invasion and Metastasis, Beijing International Cooperation Base for Science and Technology on China-UK Cancer Research, Beijing, China
| | - Yan Wang
- Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China
| | - Junfang Zheng
- Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China.,Beijing Key Laboratory for Tumor Invasion and Metastasis, Beijing International Cooperation Base for Science and Technology on China-UK Cancer Research, Beijing, China
| | - Yuan Zhao
- Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China
| | - Tao Tao
- Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China
| | - Qiqi Wang
- Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China
| | - Hua Liu
- Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China.,Beijing Key Laboratory for Tumor Invasion and Metastasis, Beijing International Cooperation Base for Science and Technology on China-UK Cancer Research, Beijing, China
| | - Songlin Wang
- Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China.,Molecular Laboratory for Gene Therapy and Tooth Regeneration, Capital Medical University School of Stomatology, Beijing, China
| | - Wen G Jiang
- Beijing Key Laboratory for Tumor Invasion and Metastasis, Beijing International Cooperation Base for Science and Technology on China-UK Cancer Research, Beijing, China.,Cardiff China Medical Research Collaborative, Cardiff University School of Medicine, Cardiff, United Kingdom
| | - Junqi He
- Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China.,Beijing Key Laboratory for Tumor Invasion and Metastasis, Beijing International Cooperation Base for Science and Technology on China-UK Cancer Research, Beijing, China
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15
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Wang L, Qi Y, Xiong Y, Peng Z, Ma Q, Zhang Y, Song J, Zheng J. Ezrin-Radixin-Moesin Binding Phosphoprotein 50 ( EBP50) Suppresses the Metastasis of Breast Cancer and HeLa Cells by Inhibiting Matrix Metalloproteinase-2 Activity. Anticancer Res 2017; 37:4353-4360. [PMID: 28739728 DOI: 10.21873/anticanres.11829] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 06/08/2017] [Accepted: 06/13/2017] [Indexed: 11/10/2022]
Abstract
BACKGROUND Expression of ezrin-radixin-moesin-binding phosphoprotein-50 (EBP50) is correlated with human breast and cervical cancer development, but its effects on the metastasis of breast and cervical cancer and the underlying mechanism are not fully understood. MATERIALS AND METHODS In this study, EBP50 was overexpressed in MDA-MB-231 breast cancer and HeLa cervical cancer cells; moreover, EBP50 was knocked-down in MCF-7 breast cancer cells and HeLa cells. Metastasis-related ability and matrix metalloproteinase-2 (MMP-2) activity of these cells were investigated. RESULTS Cell adhesion, wound-healing and invasion were significantly suppressed in EBP50-overexpressing cells. Contrarily, EBP50-knockdown promoted cell adhesion, wound healing and invasion. EBP50 overexpression inhibited MMP-2 activity, and the knockdown of EBP50 promoted the activity of MMP-2, suggesting that EBP50 inhibited cell metastasis via suppression of MMP-2 activity. CONCLUSION Our work reveals the anti-metastatic effect and a new mechanism of EBP50 action in breast and cervical cancer cells.
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Affiliation(s)
- Lei Wang
- Department of Urology, Beijing Friendship Hospital, Capital Medical University, Beijing, P.R. China
| | - Yijun Qi
- Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, P.R. China
| | - Ying Xiong
- Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, P.R. China
| | - Zhiqiang Peng
- Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, P.R. China
| | - Qiang Ma
- Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, P.R. China
| | - Yue Zhang
- Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, P.R. China
| | - Jian Song
- Department of Urology, Beijing Friendship Hospital, Capital Medical University, Beijing, P.R. China
| | - Junfang Zheng
- Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, P.R. China .,Beijing Key Laboratory for Tumor Invasion and Metastasis, Beijing International Cooperation Base for Science and Technology on China-UK Cancer Research, Beijing, P.R. China
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16
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Broadbent D, Ahmadzai MM, Kammala AK, Yang C, Occhiuto C, Das R, Subramanian H. Roles of NHERF Family of PDZ-Binding Proteins in Regulating GPCR Functions. Adv Immunol 2017; 136:353-385. [PMID: 28950951 DOI: 10.1016/bs.ai.2017.05.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Multicellular organisms are equipped with an array of G-protein-coupled receptors (GPCRs) that mediate cell-cell signaling allowing them to adapt to environmental cues and ultimately survive. This is mechanistically possible through complex intracellular GPCR machinery that encompasses a vast network of proteins. Within this network, there is a group called scaffolding proteins that facilitate proper localization of signaling proteins for a quick and robust GPCR response. One protein family within this scaffolding group is the PSD-95/Dlg/ZO-1 (PDZ) family which is important for GPCR localization, internalization, recycling, and downstream signaling. Although the PDZ family of proteins regulate the functions of several receptors, this chapter focuses on a subfamily within the PDZ protein family called the Na+/H+ exchanger regulatory factors (NHERFs). Here we extensively review the predominantly characterized roles of NHERFs in renal phosphate absorption, intestinal ion regulation, cancer progression, and immune cell functions. Finally, we discuss the future perspectives and possible clinical application of targeting NHERFs in several disorders.
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Affiliation(s)
| | | | | | - Canchai Yang
- Michigan State University, East Lansing, MI, United States
| | | | - Rupali Das
- Michigan State University, East Lansing, MI, United States
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17
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Lim HC, Jou TS. Ras-activated RSK1 phosphorylates EBP50 to regulate its nuclear localization and promote cell proliferation. Oncotarget 2016; 7:10283-96. [PMID: 26862730 PMCID: PMC4891120 DOI: 10.18632/oncotarget.7184] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Accepted: 01/25/2016] [Indexed: 11/25/2022] Open
Abstract
Differential subcellular localization of EBP50 leads to its controversial role in cancer biology either as a tumor suppressor when it resides at the membrane periphery, or a tumor facilitator at the nucleus. However, the mechanism behind nuclear localization of EBP50 remains unclear. A RNA interference screening identified the downstream effector of the Ras-ERK cascade, RSK1, as the molecule unique for nuclear transport of EBP50. RSK1 binds to EBP50 and phosphorylates it at a conserved threonine residue at position 156 (T156) under the regulation of growth factor. Mutagenesis experiments confirmed the significance of T156 residue in nuclear localization of EBP50, cellular proliferation, and oncogenic transformation. Our study sheds light on a possible therapeutic strategy targeting at this aberrant nuclear expression of EBP50 without affecting the normal physiological function of EBP50 at other subcellular localization.
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Affiliation(s)
- Hooi Cheng Lim
- Graduate Institute of Molecular Medicine, National Taiwan University, Taipei, Taiwan
| | - Tzuu-Shuh Jou
- Graduate Institute of Molecular Medicine, National Taiwan University, Taipei, Taiwan.,Graduate Institute of Clinical Medicine, National Taiwan University, Taipei, Taiwan
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18
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Boratkó A, Péter M, Csortos C. Regulation of merlin by protein phosphatase 1-TIMAP and EBP50 in endothelial cells. Int J Biochem Cell Biol 2016; 82:10-17. [PMID: 27871951 DOI: 10.1016/j.biocel.2016.11.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Revised: 10/18/2016] [Accepted: 11/14/2016] [Indexed: 11/16/2022]
Abstract
Merlin (moesin-ezrin-radixin like protein), the product of neurofibromatosis type 2 gene, was primarily recognized as a tumor suppressor, but it also functions as a membrane-cytoskeletal linker and regulator of multiple signaling pathways. The activity and localization of merlin is regulated by head to tail folding that is controlled by phosphorylation of the Ser518 side chain. Merlin localizes in the nucleus when the Ser518 side chain is not phosphorylated, while the phosphorylated form is present in the cytoplasm and the plasma membrane. In this work interactions and their impact on the subcellular localization and phosphorylation state of the Ser518 side chain of merlin were investigated in endothelial cells. It is shown that merlin (dephospho-Ser518 form) interacts in the nucleus of endothelial cells with the scaffolding protein EBP50, a member of the Na+/H+exchanger regulatory factor family. Upon EBP50 depletion, merlin translocated from the nucleus, suggesting that binding of merlin to EBP50 is critical in the nuclear localization of merlin. Along with the translocation, the phosphorylation level of phospho-Ser518-merlin was increased in EBP50 depleted cells. TIMAP (TGFβ-inhibited membrane-associated protein), a type 1 protein phosphatase (PP1) regulatory subunit, was newly recognized as an interacting partner for merlin. Domain mapping using truncated mutant forms in GST pull down revealed that the N-terminal half of TIMAP (aa 1-290) and the FERM domain of merlin are the regions responsible for the interaction.The catalytic subunit of PP1 (PP1c) was present in all merlin-TIMAP pull down or immunoprecipitation samples demonstrating that merlin actually interacts with the PP1c-TIMAP holoenzyme. On the other hand, from TIMAP depleted cells, without its targeting protein, PP1c could not bind to merlin. Also, when the phosphatase activity of PP1c-TIMAP was inhibited either with depletion of TIMAP or by treatment of the cells with specific PP1 inhibitor, there was an increase in the amount of phospho-Ser518 form of merlin in the membrane of the cells. These data strongly suggest that the PP1c-TIMAP- complex dephosphorylates phospho-Ser518-merlin. ECIS measurements indicate that phospho-merlin accelerates in vitro wound healing of the endothelial monolayer. In conclusion, in endothelial cells, EBP50 is required for the nuclear localization of merlin and the PP1c-TIMAP holoenzyme plays an important role in the dephosphorylation of merlin on its Ser518 side chain, which influence cell migration and proliferation.
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Affiliation(s)
- Anita Boratkó
- Department of Medical Chemistry, Faculty of Medicine, University of Debrecen, Egyetem tér 1., Debrecen H-4032, Hungary
| | - Margit Péter
- Department of Medical Chemistry, Faculty of Medicine, University of Debrecen, Egyetem tér 1., Debrecen H-4032, Hungary
| | - Csilla Csortos
- Department of Medical Chemistry, Faculty of Medicine, University of Debrecen, Egyetem tér 1., Debrecen H-4032, Hungary.
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Al Ghouleh I, Meijles DN, Mutchler S, Zhang Q, Sahoo S, Gorelova A, Henrich Amaral J, Rodríguez AI, Mamonova T, Song GJ, Bisello A, Friedman PA, Cifuentes-Pagano ME, Pagano PJ. Binding of EBP50 to Nox organizing subunit p47phox is pivotal to cellular reactive species generation and altered vascular phenotype. Proc Natl Acad Sci U S A 2016; 113:E5308-17. [PMID: 27540115 DOI: 10.1073/pnas.1514161113] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Despite numerous reports implicating NADPH oxidases (Nox) in the pathogenesis of many diseases, precise regulation of this family of professional reactive oxygen species (ROS) producers remains unclear. A unique member of this family, Nox1 oxidase, functions as either a canonical or hybrid system using Nox organizing subunit 1 (NoxO1) or p47(phox), respectively, the latter of which is functional in vascular smooth muscle cells (VSMC). In this manuscript, we identify critical requirement of ezrin-radixin-moesin-binding phosphoprotein 50 (EBP50; aka NHERF1) for Nox1 activation and downstream responses. Superoxide (O2 (•-)) production induced by angiotensin II (AngII) was absent in mouse EBP50 KO VSMC vs. WT. Moreover, ex vivo incubation of aortas with AngII showed a significant increase in O2 (•-) in WT but not EBP50 or Nox1 nulls. Similarly, lipopolysaccharide (LPS)-induced oxidative stress was attenuated in femoral arteries from EBP50 KO vs. WT. In silico analyses confirmed by confocal microscopy, immunoprecipitation, proximity ligation assay, FRET, and gain-/loss-of-function mutagenesis revealed binding of EBP50, via its PDZ domains, to a specific motif in p47(phox) Functional studies revealed AngII-induced hypertrophy was absent in EBP50 KOs, and in VSMC overexpressing EBP50, Nox1 gene silencing abolished VSMC hypertrophy. Finally, ex vivo measurement of lumen diameter in mouse resistance arteries exhibited attenuated AngII-induced vasoconstriction in EBP50 KO vs. WT. Taken together, our data identify EBP50 as a previously unidentified regulator of Nox1 and support that it promotes Nox1 activity by binding p47(phox) This interaction is pivotal for agonist-induced smooth muscle ROS, hypertrophy, and vasoconstriction and has implications for ROS-mediated physiological and pathophysiological processes.
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Ji M, Fan D, Yuan L, Zhang Y, Dong W, Peng X. EBP50 inhibits pancreatic cancer cell growth and invasion by targeting the β-catenin/E-cadherin pathway. Exp Ther Med 2015; 10:1311-1316. [PMID: 26622484 PMCID: PMC4578050 DOI: 10.3892/etm.2015.2684] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2014] [Accepted: 07/31/2015] [Indexed: 12/13/2022] Open
Abstract
Ezrin-radixin-moesin (ERM)-binding phosphoprotein 50 (EBP50) has previously been demonstrated to be associated with the malignant transformation of numerous types of human cancer. The aim of the present study was to investigate the effect of EBP50 overexpression on pancreatic cancer and the underlying mechanism. Reverse transcription-quantitative polymerase chain reaction was used to detect the expression of EBP50 in human pancreatic cancer tissue specimens. Furthermore, pBK-CMV-HA-EBP50 and the pBK-CMV-HA vectors were transfected into pancreatic cancer cells and the effect of EBP50 upregulation on the proliferation and invasion of the cells was investigated. In addition, the effect of EBP50 overexpression on β-catenin and E-cadherin expression was evaluated. The results revealed that overexpression of EBP50 suppressed cell growth and invasion in two human pancreatic cancer cell lines. Overexpression of EBP50 also suppressed β-catenin expression and increased E-cadherin expression. Thus, the present study demonstrated that EBP50 inhibits pancreatic cancer cell growth and invasion through targeting the β-catenin/E-cadherin pathway. The results suggest that EBP50 may function as a potential tumor suppressor and thus may serve as a potential therapeutic target.
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Affiliation(s)
- Mengyao Ji
- Department of Gastroenterology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Dikun Fan
- Department of Cardiac Surgery, Center Hospital of Nayang, Henan 473009, P.R. China
| | - Lei Yuan
- Department of Information Center, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Yunting Zhang
- Department of Gastroenterology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Weiguo Dong
- Department of Gastroenterology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Xiulan Peng
- Department of Oncology, The Fifth Hospital of Wuhan, Wuhan, Hubei 430050, P.R. China
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Park JY, Duc NM, Kim DK, Lee SY, Li S, Seo MD, Woods VL, Chung KY. Different conformational dynamics of PDZ1 and PDZ2 in full-length EBP50 analyzed by hydrogen/deuterium exchange mass spectrometry. Biochem Cell Biol 2015; 93:290-7. [PMID: 25789870 DOI: 10.1139/bcb-2014-0145] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Ezrin-radixin-moesin-binding protein 50 (EBP50) is a scaffolding protein expressed in polarized epithelial cells in various organs, including the liver, kidney, and small intestine, in which it regulates the trafficking and targeting cellular proteins. EBP50 contains two postsynaptic density-95/disk-large/ZO-1 homology (PDZ) domains (e.g., PDZ1 and PDZ2) and an ezrin/radixin/moesin-binding (EB) domain. PDZ domains are one of the major scaffolding domains regulating protein-protein interactions with critical biological roles in cell polarity, migration, proliferation, recognition, and cell-cell interaction. PDZ1 and PDZ2 in EBP50 have different ligand selectivity, although several high-resolution structural studies of isolated PDZ1 and PDZ2 showed similar structures. We studied the conformations of full-length EBP50 and isolated PDZ1 and PDZ2 using hydrogen/deuterium exchange mass spectrometry (HDX-MS). The deuterium uptake profiles of isolated PDZ1 and PDZ2 were similar to those of full-length EBP50. Interestingly, PDZ1 was more dynamic than PDZ2, and these PDZ domains underwent different conformational changes upon ligand binding. These results might explain the differences in ligand-selectivity between PDZ1 and PDZ2.
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Affiliation(s)
- Ji Young Park
- a School of Pharmacy, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, 440746, Republic of Korea
| | - Nguyen Minh Duc
- a School of Pharmacy, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, 440746, Republic of Korea
| | - Dong Kyun Kim
- a School of Pharmacy, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, 440746, Republic of Korea
| | - Su Youn Lee
- a School of Pharmacy, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, 440746, Republic of Korea
| | - Sheng Li
- b Department of medicine, University of California at San Diego, La Jolla, CA 92093, USA
| | - Min-Duk Seo
- c College of Pharmacy & Department of Molecular Science and Technology, Ajou University, Suwon 443749, Republic of Korea
| | - Virgil L Woods
- b Department of medicine, University of California at San Diego, La Jolla, CA 92093, USA
| | - Ka Young Chung
- a School of Pharmacy, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, 440746, Republic of Korea
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Song GJ, Leslie KL, Barrick S, Mamonova T, Fitzpatrick JM, Drombosky KW, Peyser N, Wang B, Pellegrini M, Bauer PM, Friedman PA, Mierke DF, Bisello A. Phosphorylation of ezrin-radixin-moesin-binding phosphoprotein 50 ( EBP50) by Akt promotes stability and mitogenic function of S-phase kinase-associated protein-2 (Skp2). J Biol Chem 2014; 290:2879-87. [PMID: 25492869 DOI: 10.1074/jbc.m114.609768] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The regulation of the cell cycle by the ubiquitin-proteasome system is dependent on the activity of E3 ligases. Skp2 (S-phase kinase associated protein-2) is the substrate recognition subunit of the E3 ligase that ubiquitylates the cell cycle inhibitors p21(cip1) and p27(kip1) thus promoting cell cycle progression. Increased expression of Skp2 is frequently observed in diseases characterized by excessive cell proliferation, such as cancer and neointima hyperplasia. The stability and cellular localization of Skp2 are regulated by Akt, but the molecular mechanisms underlying these effects remain only partly understood. The scaffolding protein Ezrin-Binding Phosphoprotein of 50 kDa (EBP50) contains two PDZ domains and plays a critical role in the development of neointimal hyperplasia. Here we report that EBP50 directly binds Skp2 via its first PDZ domain. Moreover, EBP50 is phosphorylated by Akt on Thr-156 within the second PDZ domain, an event that allosterically promotes binding to Skp2. The interaction with EBP50 causes cytoplasmic localization of Skp2, increases Skp2 stability and promotes proliferation of primary vascular smooth muscle cells. Collectively, these studies define a novel regulatory mechanism contributing to aberrant cell growth and highlight the importance of scaffolding function of EBP50 in Akt-dependent cell proliferation.
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Affiliation(s)
- Gyun Jee Song
- From the Department of Pharmacology and Chemical Biology, Department of Pharmacology, Brain Science and Engineering Institute, School of Medicine, Kungpook National University, Daegu 702-701, Korea, and
| | | | - Stacey Barrick
- From the Department of Pharmacology and Chemical Biology
| | | | | | | | - Noah Peyser
- From the Department of Pharmacology and Chemical Biology
| | - Bin Wang
- From the Department of Pharmacology and Chemical Biology
| | - Maria Pellegrini
- Department of Chemistry, Dartmouth College, Hanover, New Hampshire 03755
| | - Philip M Bauer
- Vascular Medicine Institute, and Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15260
| | | | - Dale F Mierke
- Department of Chemistry, Dartmouth College, Hanover, New Hampshire 03755
| | - Alessandro Bisello
- From the Department of Pharmacology and Chemical Biology, Vascular Medicine Institute, and
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Leslie KL, Song GJ, Barrick S, Wehbi VL, Vilardaga JP, Bauer PM, Bisello A. Ezrin-radixin-moesin-binding phosphoprotein 50 ( EBP50) and nuclear factor-κB (NF-κB): a feed-forward loop for systemic and vascular inflammation. J Biol Chem 2013; 288:36426-36. [PMID: 24196963 DOI: 10.1074/jbc.m113.483339] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The interaction between vascular cells and macrophages is critical during vascular remodeling. Here we report that the scaffolding protein, ezrin-binding phosphoprotein 50 (EBP50), is a central regulator of macrophage and vascular smooth muscle cells (VSMC) function. EBP50 is up-regulated in intimal VSMC following endoluminal injury and promotes neointima formation. However, the mechanisms underlying these effects are not fully understood. Because of the fundamental role that inflammation plays in vascular diseases, we hypothesized that EBP50 mediates macrophage activation and the response of vessels to inflammation. Indeed, EBP50 expression increased in primary macrophages and VSMC, and in the aorta of mice, upon treatment with LPS or TNFα. This increase was nuclear factor-κB (NF-κB)-dependent. Conversely, activation of NF-κB was impaired in EBP50-null VSMC and macrophages. We found that inflammatory stimuli promote the formation of an EBP50-PKCζ complex at the cell membrane that induces NF-κB signaling. Macrophage activation and vascular inflammation after acute LPS treatment were reduced in EBP50-null cells and mice as compared with WT. Furthermore, macrophage recruitment to vascular lesions was significantly reduced in EBP50 knock-out mice. Thus, EBP50 and NF-κB participate in a feed-forward loop leading to increased macrophage activation and enhanced response of vascular cells to inflammation.
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