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Wang H, Ye M, Jin X. Role of angiomotin family members in human diseases (Review). Exp Ther Med 2024; 27:258. [PMID: 38766307 PMCID: PMC11099588 DOI: 10.3892/etm.2024.12546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 10/23/2023] [Indexed: 05/22/2024] Open
Abstract
Angiomotin (Amot) family members, including Amot, Amot-like protein 1 (Amotl1) and Amot-like protein 2 (Amotl2), have been found to interact with angiostatins. In addition, Amot family members are involved in various physiological and pathological functions such as embryonic development, angiogenesis and tumorigenesis. Some studies have also demonstrated its regulation in signaling pathways such as the Hippo signaling pathway, AMPK signaling pathway and mTOR signaling pathways. Amot family members play an important role in neural stem cell differentiation, dendritic formation and synaptic maturation. In addition, an increasing number of studies have focused on their function in promoting and/or suppressing cancer, but the underlying mechanisms remain to be elucidated. The present review integrated relevant studies on upstream regulation and downstream signals of Amot family members, as well as the latest progress in physiological and pathological functions and clinical applications, hoping to offer important ideas for further research.
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Affiliation(s)
- Haoyun Wang
- Department of Biochemistry and Molecular Biology and Zhejiang Key Laboratory of Pathophysiology, Health Science Center, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
- Department of Radiotherapy, The First Hospital of Ningbo University, Ningbo, Zhejiang 315010, P.R. China
| | - Meng Ye
- Department of Biochemistry and Molecular Biology and Zhejiang Key Laboratory of Pathophysiology, Health Science Center, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
- Department of Radiotherapy, The First Hospital of Ningbo University, Ningbo, Zhejiang 315010, P.R. China
| | - Xiaofeng Jin
- Department of Biochemistry and Molecular Biology and Zhejiang Key Laboratory of Pathophysiology, Health Science Center, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
- Department of Radiotherapy, The First Hospital of Ningbo University, Ningbo, Zhejiang 315010, P.R. China
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Ma N, Wibowo YC, Wirtz P, Baltus D, Wieland T, Jansen S. Tankyrase inhibition interferes with junction remodeling, induces leakiness, and disturbs YAP1/TAZ signaling in the endothelium. NAUNYN-SCHMIEDEBERG'S ARCHIVES OF PHARMACOLOGY 2024; 397:1763-1789. [PMID: 37741944 PMCID: PMC10858845 DOI: 10.1007/s00210-023-02720-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Accepted: 09/12/2023] [Indexed: 09/25/2023]
Abstract
Tankyrase inhibitors are increasingly considered for therapeutic use in malignancies that are characterized by high intrinsic β-catenin activity. However, how tankyrase inhibition affects the endothelium after systemic application remains poorly understood. In this study, we aimed to investigate how the tankyrase inhibitor XAV939 affects endothelial cell function and the underlying mechanism involved. Endothelial cell function was analyzed using sprouting angiogenesis, endothelial cell migration, junctional dynamics, and permeability using human umbilical vein endothelial cells (HUVEC) and explanted mouse retina. Underlying signaling was studied using western blot, immunofluorescence, and qPCR in HUVEC in addition to luciferase reporter gene assays in human embryonic kidney cells. XAV939 treatment leads to altered junctional dynamics and permeability as well as impaired endothelial migration. Mechanistically, XAV939 increased stability of the angiomotin-like proteins 1 and 2, which impedes the nuclear translocation of YAP1/TAZ and consequently suppresses TEAD-mediated transcription. Intriguingly, XAV939 disrupts adherens junctions by inducing RhoA-Rho dependent kinase (ROCK)-mediated F-actin bundling, whereas disruption of F-actin bundling through the ROCK inhibitor H1152 restores endothelial cell function. Unexpectedly, this was accompanied by an increase in nuclear TAZ and TEAD-mediated transcription, suggesting differential regulation of YAP1 and TAZ by the actin cytoskeleton in endothelial cells. In conclusion, our findings elucidate the complex relationship between the actin cytoskeleton, YAP1/TAZ signaling, and endothelial cell function and how tankyrase inhibition disturbs this well-balanced signaling.
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Affiliation(s)
- Nan Ma
- Experimental Pharmacology Mannheim, European Center for Angioscience (ECAS), Mannheim Medical Faculty, Heidelberg University, Mannheim, Germany
| | - Yohanes Cakrapradipta Wibowo
- Experimental Pharmacology Mannheim, European Center for Angioscience (ECAS), Mannheim Medical Faculty, Heidelberg University, Mannheim, Germany
| | - Phillip Wirtz
- Experimental Pharmacology Mannheim, European Center for Angioscience (ECAS), Mannheim Medical Faculty, Heidelberg University, Mannheim, Germany
| | - Doris Baltus
- Experimental Pharmacology Mannheim, European Center for Angioscience (ECAS), Mannheim Medical Faculty, Heidelberg University, Mannheim, Germany
| | - Thomas Wieland
- Experimental Pharmacology Mannheim, European Center for Angioscience (ECAS), Mannheim Medical Faculty, Heidelberg University, Mannheim, Germany.
- DZHK, German Center for Cardiovascular Research, partner site Heidelberg/Mannheim, Mannheim, Germany.
| | - Sepp Jansen
- Experimental Pharmacology Mannheim, European Center for Angioscience (ECAS), Mannheim Medical Faculty, Heidelberg University, Mannheim, Germany
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3
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Systemic Cytokines in Retinopathy of Prematurity. J Pers Med 2023; 13:jpm13020291. [PMID: 36836525 PMCID: PMC9966226 DOI: 10.3390/jpm13020291] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 01/30/2023] [Accepted: 01/30/2023] [Indexed: 02/09/2023] Open
Abstract
Retinopathy of prematurity (ROP), a vasoproliferative vitreoretinal disorder, is the leading cause of childhood blindness worldwide. Although angiogenic pathways have been the main focus, cytokine-mediated inflammation is also involved in ROP etiology. Herein, we illustrate the characteristics and actions of all cytokines involved in ROP pathogenesis. The two-phase (vaso-obliteration followed by vasoproliferation) theory outlines the evaluation of cytokines in a time-dependent manner. Levels of cytokines may even differ between the blood and the vitreous. Data from animal models of oxygen-induced retinopathy are also valuable. Although conventional cryotherapy and laser photocoagulation are well established and anti-vascular endothelial growth factor agents are available, less destructive novel therapeutics that can precisely target the signaling pathways are required. Linking the cytokines involved in ROP to other maternal and neonatal diseases and conditions provides insights into the management of ROP. Suppressing disordered retinal angiogenesis via the modulation of hypoxia-inducible factor, supplementation of insulin-like growth factor (IGF)-1/IGF-binding protein 3 complex, erythropoietin, and its derivatives, polyunsaturated fatty acids, and inhibition of secretogranin III have attracted the attention of researchers. Recently, gut microbiota modulation, non-coding RNAs, and gene therapies have shown promise in regulating ROP. These emerging therapeutics can be used to treat preterm infants with ROP.
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Moyon A, Garrigue P, Fernandez S, Hubert F, Balasse L, Brige P, Hache G, Nail V, Blot-Chabaud M, Dignat-George F, Rochais F, Guillet B. Comparison of a New 68Ga-Radiolabelled PET Imaging Agent sCD146 and RGD Peptide for In Vivo Evaluation of Angiogenesis in Mouse Model of Myocardial Infarction. Cells 2021; 10:cells10092305. [PMID: 34571954 PMCID: PMC8466330 DOI: 10.3390/cells10092305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Revised: 08/31/2021] [Accepted: 08/31/2021] [Indexed: 11/16/2022] Open
Abstract
Ischemic vascular diseases are associated with elevated tissue expression of angiomotin (AMOT), a promising molecular target for PET imaging. On that basis, we developed an AMOT-targeting radiotracer, 68Ga-sCD146 and performed the first in vivo evaluation on a myocardial infarction mice model and then, compared AMOT expression and αvβ3-integrin expression with 68Ga-sCD146 and 68Ga-RGD2 imaging. After myocardial infarction (MI) induced by permanent ligation of the left anterior descending coronary artery, myocardial perfusion was evaluated by Doppler ultrasound and by 18F-FDG PET imaging. 68Ga-sCD146 and 68Ga-RGD2 PET imaging were performed. In myocardial infarction model, heart-to-muscle ratio of 68Ga-sCD146 imaging showed a significantly higher radiotracer uptake in the infarcted area of MI animals than in sham (* p = 0.04). Interestingly, we also observed significant correlations between 68Ga-sCD146 imaging and delayed residual perfusion assessed by 18F-FDG (* p = 0.04), with lowest tissue fibrosis assessed by histological staining (* p = 0.04) and with functional recovery assessed by ultrasound imaging (** p = 0.01). 68Ga-sCD146 demonstrated an increase in AMOT expression after MI. Altogether, significant correlations of early post-ischemic 68Ga-sCD146 uptake with late heart perfusion, lower tissue fibrosis and better functional recovery, make 68Ga-sCD146 a promising radiotracer for tissue angiogenesis assessment after MI.
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Affiliation(s)
- Anaïs Moyon
- Pharmacological Faculty, Aix Marseille University, INSERM 1263, INRAE 1260, C2VN, 13385 Marseille, France; (P.G.); (G.H.); (V.N.); (M.B.-C.); (F.D.-G.); (B.G.)
- Medical Faculty, Aix-Marseille University, CNRS 2012, CERIMED, 13385 Marseille, France; (S.F.); (L.B.); (P.B.)
- APHM, Service de Radiopharmacie, 13005 Marseille, France
- Correspondence:
| | - Philippe Garrigue
- Pharmacological Faculty, Aix Marseille University, INSERM 1263, INRAE 1260, C2VN, 13385 Marseille, France; (P.G.); (G.H.); (V.N.); (M.B.-C.); (F.D.-G.); (B.G.)
- Medical Faculty, Aix-Marseille University, CNRS 2012, CERIMED, 13385 Marseille, France; (S.F.); (L.B.); (P.B.)
- APHM, Service de Radiopharmacie, 13005 Marseille, France
| | - Samantha Fernandez
- Medical Faculty, Aix-Marseille University, CNRS 2012, CERIMED, 13385 Marseille, France; (S.F.); (L.B.); (P.B.)
| | - Fabien Hubert
- Medical Faculty, Aix Marseille University, INSERM, MMG, U 1251, 13385 Marseille, France; (F.H.); (F.R.)
| | - Laure Balasse
- Medical Faculty, Aix-Marseille University, CNRS 2012, CERIMED, 13385 Marseille, France; (S.F.); (L.B.); (P.B.)
| | - Pauline Brige
- Medical Faculty, Aix-Marseille University, CNRS 2012, CERIMED, 13385 Marseille, France; (S.F.); (L.B.); (P.B.)
- Medical Faculty, Aix-Marseille University, UR4264, LIIE, 13385 Marseille, France
| | - Guillaume Hache
- Pharmacological Faculty, Aix Marseille University, INSERM 1263, INRAE 1260, C2VN, 13385 Marseille, France; (P.G.); (G.H.); (V.N.); (M.B.-C.); (F.D.-G.); (B.G.)
- Medical Faculty, Aix-Marseille University, CNRS 2012, CERIMED, 13385 Marseille, France; (S.F.); (L.B.); (P.B.)
| | - Vincent Nail
- Pharmacological Faculty, Aix Marseille University, INSERM 1263, INRAE 1260, C2VN, 13385 Marseille, France; (P.G.); (G.H.); (V.N.); (M.B.-C.); (F.D.-G.); (B.G.)
- Medical Faculty, Aix-Marseille University, CNRS 2012, CERIMED, 13385 Marseille, France; (S.F.); (L.B.); (P.B.)
- APHM, Service de Radiopharmacie, 13005 Marseille, France
| | - Marcel Blot-Chabaud
- Pharmacological Faculty, Aix Marseille University, INSERM 1263, INRAE 1260, C2VN, 13385 Marseille, France; (P.G.); (G.H.); (V.N.); (M.B.-C.); (F.D.-G.); (B.G.)
| | - Françoise Dignat-George
- Pharmacological Faculty, Aix Marseille University, INSERM 1263, INRAE 1260, C2VN, 13385 Marseille, France; (P.G.); (G.H.); (V.N.); (M.B.-C.); (F.D.-G.); (B.G.)
- APHM, Service d’Hématologie, Hôpital Conception, 13005 Marseille, France
| | - Francesca Rochais
- Medical Faculty, Aix Marseille University, INSERM, MMG, U 1251, 13385 Marseille, France; (F.H.); (F.R.)
| | - Benjamin Guillet
- Pharmacological Faculty, Aix Marseille University, INSERM 1263, INRAE 1260, C2VN, 13385 Marseille, France; (P.G.); (G.H.); (V.N.); (M.B.-C.); (F.D.-G.); (B.G.)
- Medical Faculty, Aix-Marseille University, CNRS 2012, CERIMED, 13385 Marseille, France; (S.F.); (L.B.); (P.B.)
- APHM, Service de Radiopharmacie, 13005 Marseille, France
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Upadhyay N, Tilekar K, Safuan S, Kumar AP, Stalin J, Ruegg C, Ramaa C S. Recent Anti‐angiogenic Drug Discovery Efforts To Combat Cancer. ChemistrySelect 2021. [DOI: 10.1002/slct.202101792] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Neha Upadhyay
- Department of Pharmaceutical Chemistry Bharati Vidyapeeth's College of Pharmacy Sector 8, CBD Belapur Navi Mumbai 400614 India
| | - Kalpana Tilekar
- Department of Pharmaceutical Chemistry Bharati Vidyapeeth's College of Pharmacy Sector 8, CBD Belapur Navi Mumbai 400614 India
| | - Sabreena Safuan
- Pusat pengajian sains School of Health Sciences Universiti Sains Malaysia Malaysia 16150 Kubang Kerian Kelantan
| | - Alan P. Kumar
- Department of Pharmacology National University of Singapore Singapore
| | - Jimmy Stalin
- Department of Oncology Microbiology, and Immunology University of Fribourg Chemin du Musée 18, PER17, CH 1700 Fribourg Switzerland
| | - Curzio Ruegg
- Department of Oncology Microbiology, and Immunology University of Fribourg Chemin du Musée 18, PER17, CH 1700 Fribourg Switzerland
| | - Ramaa C S
- Department of Pharmaceutical Chemistry Bharati Vidyapeeth's College of Pharmacy Sector 8, CBD Belapur Navi Mumbai 400614 India
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Decreased Lymphangiogenic Activities and Genes Expression of Cord Blood Lymphatic Endothelial Progenitor Cells (VEGFR3 +/Pod +/CD11b + Cells) in Patient with Preeclampsia. Int J Mol Sci 2021; 22:ijms22084237. [PMID: 33921847 PMCID: PMC8073258 DOI: 10.3390/ijms22084237] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 04/12/2021] [Accepted: 04/16/2021] [Indexed: 12/26/2022] Open
Abstract
The abnormal development or disruption of the lymphatic vasculature has been implicated in metabolic and hypertensive diseases. Recent evidence suggests that the offspring exposed to preeclampsia (PE) in utero are at higher risk of long-term health problems, such as cardiovascular and metabolic diseases in adulthood, owing to in utero fetal programming. We aimed to investigate lymphangiogenic activities in the lymphatic endothelial progenitor cells (LEPCs) of the offspring of PE. Human umbilical cord blood LEPCs from pregnant women with severe PE (n = 10) and gestationally matched normal pregnancies (n = 10) were purified with anti-vascular endothelial growth factor receptor 3 (VEGFR3)/podoplanin/CD11b microbeads using a magnetic cell sorter device. LEPCs from PE displayed significantly delayed differentiation and reduced formation of lymphatic endothelial cell (LEC) colonies compared with the LEPCs from normal pregnancies. LECs differentiated from PE-derived LEPCs exhibited decreased tube formation, migration, proliferation, adhesion, wound healing, and 3D-sprouting activities as well as increased lymphatic permeability through the disorganization of VE-cadherin junctions, compared with the normal pregnancy-derived LECs. In vivo, LEPCs from PE showed significantly reduced lymphatic vessel formation compared to the LEPCs of the normal pregnancy. Gene expression analysis revealed that compared to the normal pregnancy-derived LECs, the PE-derived LECs showed a significant decrease in the expression of pro-lymphangiogenic genes (GREM1, EPHB3, VEGFA, AMOT, THSD7A, ANGPTL4, SEMA5A, FGF2, and GBX2). Collectively, our findings demonstrate, for the first time, that LEPCs from PE have reduced lymphangiogenic activities in vitro and in vivo and show the decreased expression of pro-lymphangiogenic genes. This study opens a new avenue for investigation of the molecular mechanism of LEPC differentiation and lymphangiogenesis in the offspring of PE and subsequently may impact the treatment of long-term health problems such as cardiovascular and metabolic disorders of offspring with abnormal development of lymphatic vasculature.
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7
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Ervolino De Oliveira C, Dourado MR, Sawazaki-Calone Í, Costa De Medeiros M, Rossa Júnior C, De Karla Cervigne N, Esquiche León J, Lambert D, Salo T, Graner E, Coletta RD. Activin A triggers angiogenesis via regulation of VEGFA and its overexpression is associated with poor prognosis of oral squamous cell carcinoma. Int J Oncol 2020; 57:364-376. [PMID: 32377747 DOI: 10.3892/ijo.2020.5058] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 04/15/2020] [Indexed: 11/05/2022] Open
Abstract
Poor prognosis associated with the dysregulated expression of activin A in a number of malignancies has been related to with numerous aspects of tumorigenesis, including angiogenesis. The present study investigated the prognostic significance of activin A immunoexpression in blood vessels and cancer cells in a number of oral squamous cell carcinoma (OSCC) cases and applied in vitro strategies to determine the impact of activin A on angiogenesis. In a cohort of 95 patients with OSCC, immunoexpression of activin A in both blood vessels and tumor cells was quantified and the association with clinicopathological parameters and survival was analyzed. Effects of activin A on the tube formation, proliferation and migration of human umbilical vein endothelial cells (HUVECs) were evaluated in gain‑of‑function (treatment with recombinant activin A) or loss‑of‑function [treatment with activin A‑antagonist follistatin or by stable transfection with short hairpin RNA (shRNA) targeting activin A] conditions. Conditioned medium from an OSCC cell line with shRNA‑mediated depletion of activin A was also tested. The profile of pro‑ and anti‑angiogenic factors regulated by activin A was assessed with a human angiogenesis quantitative PCR (qPCR) array. Vascular endothelial growth factor A (VEGFA) and its major isoforms were evaluated by reverse transcription‑qPCR and ELISA. Activin A expression in blood vessels demonstrated an independent prognostic value in the multivariate analysis with a hazard ratio of 2.47 [95% confidence interval (CI), 1.30‑4.71; P=0.006) for disease‑specific survival and 2.09 (95% CI, 1.07‑4.08l: P=0.03) for disease‑free survival. Activin A significantly increased tubular formation of HUVECs concomitantly with an increase in proliferation. This effect was validated by reduced proliferation and tubular formation of HUVECs following inhibition of activin A by follistatin or shRNA, as well as by treatment of HUVECs with conditioned medium from activin A‑depleted OSCC cells. Activin A‑knockdown increased the migration of HUVECs. In addition, activin A stimulated the phosphorylation of SMAD2/3 and the expression and production of total VEGFA, significantly enhancing the expression of its pro‑angiogenic isoform 121. The present findings suggest that activin A is a predictor of the prognosis of patients with OSCC, and provide evidence that activin A, in an autocrine and paracrine manner, may contribute to OSCC angiogenesis through differential expression of the isoform 121 of VEGFA.
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Affiliation(s)
| | - Maurício Rocha Dourado
- Department of Oral Diagnosis, School of Dentistry, University of Campinas, Piracicaba, SP 13414‑018, Brazil
| | - Íris Sawazaki-Calone
- Department of Oral Pathology and Oral Medicine, Dentistry School, Western Paraná State University, Cascavel, PR 85819‑170, Brazil
| | - Marcell Costa De Medeiros
- Departament of Diagnosis and Surgery, School of Dentistry at Araraquara, Araraquara, SP 14801‑385, Brazil
| | - Carlos Rossa Júnior
- Departament of Diagnosis and Surgery, School of Dentistry at Araraquara, Araraquara, SP 14801‑385, Brazil
| | | | - Jorge Esquiche León
- Departament of Stomatology, Public Oral Health and Forensic Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP 14040‑904, Brazil
| | - Daniel Lambert
- Integrated Biosciences, School of Clinical Dentistry and Sheffield Cancer Centre, University of Sheffield, Sheffield S10 2TG, UK
| | - Tuula Salo
- Cancer and Translational Medicine Research Unit, Faculty of Medicine and Medical Research Center Oulu, Oulu University Hospital, University of Oulu, Oulu 90220, Finland
| | - Edgard Graner
- Department of Oral Diagnosis, School of Dentistry, University of Campinas, Piracicaba, SP 13414‑018, Brazil
| | - Ricardo D Coletta
- Department of Oral Diagnosis, School of Dentistry, University of Campinas, Piracicaba, SP 13414‑018, Brazil
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Brunner P, Hastar N, Kaehler C, Burdzinski W, Jatzlau J, Knaus P. AMOT130 drives BMP-SMAD signaling at the apical membrane in polarized cells. Mol Biol Cell 2019; 31:118-130. [PMID: 31800378 PMCID: PMC6960409 DOI: 10.1091/mbc.e19-03-0179] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The large isoform of the transmembrane protein angiomotin (AMOT130) controls cell proliferation and migration of many cell types. AMOT130 associates to the actin cytoskeleton and regulates tight-junction maintenance and signaling often via endosomal uptake of polarity proteins at tight junctions. AMOT130 is highly polarized and present only at the apical side of polarized cells. Here we show that bone morphogenetic protein (BMP) growth factor signaling and AMOT function are interlinked in apical-basal polarized cells. BMP6 controls AMOT internalization and endosomal trafficking in epithelial cells. AMOT130 interacts with the BMP receptor BMPR2 and facilitates SMAD activation and target gene expression. We further demonstrate that this effect of AMOT on BMP-SMAD signaling is dependent on endocytosis and specific to the apical side of polarized epithelial and endothelial cells. Knockdown of AMOT reduces SMAD signaling only from the apical side of polarized cells, while basolateral BMP-SMAD signaling is unaffected. This allows for the first time interference with BMP signaling in a polarized manner and identifies AMOT130 as a novel BMP signaling regulator.
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Affiliation(s)
- Patrizia Brunner
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, 14195 Berlin, Germany.,Berlin School of Integrative Oncology, Charité-Universitätsmedizin Berlin, 13353 Berlin, Germany
| | - Nurcan Hastar
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, 14195 Berlin, Germany.,Berlin-Brandenburg School for Regenerative Therapies, Charité-Universitätsmedizin Berlin, 13353 Berlin, Germany
| | - Christian Kaehler
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, 14195 Berlin, Germany
| | - Wiktor Burdzinski
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, 14195 Berlin, Germany
| | - Jerome Jatzlau
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, 14195 Berlin, Germany.,Berlin-Brandenburg School for Regenerative Therapies, Charité-Universitätsmedizin Berlin, 13353 Berlin, Germany
| | - Petra Knaus
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, 14195 Berlin, Germany.,Berlin-Brandenburg School for Regenerative Therapies, Charité-Universitätsmedizin Berlin, 13353 Berlin, Germany
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9
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Angiomotin-p130 inhibits β-catenin stability by competing with Axin for binding to tankyrase in breast cancer. Cell Death Dis 2019; 10:179. [PMID: 30792381 PMCID: PMC6385204 DOI: 10.1038/s41419-019-1427-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 02/03/2019] [Accepted: 02/05/2019] [Indexed: 01/02/2023]
Abstract
Growing evidence indicates that Angiomotin (Amot)-p130 and Amot-p80 have different physiological functions. We hypothesized that Amot-p130 is a tumor suppressor gene in breast cancer, in contrast with the canonical oncogenicity of Amot-p80 or total Amot. To clarify the role of Amot-p130 in breast cancer, we performed real-time quantitative PCR, western blotting, flow cytometry, microarray, immunofluorescence, immunoprecipitation, and tumor sphere-formation assays in vitro, as well as tumorigenesis and limited-dilution analysis in vivo. In this study, we showed that Amot-p130 inhibited the proliferation, migration, and invasion of breast cancer cells. Interestingly, transcriptional profiles indicated that genes differentially expressed in response to Amot-p130 knockdown were mostly related to β-catenin signaling in MCF7 cells. More importantly, most of the downstream partners of β-catenin were associated with stemness. In a further validation, Amot-p130 inhibited the cancer stem cell potential of breast cancer cells both in vitro and in vivo. Mechanistically, Amot-p130 decreased β-catenin stability by competing with Axin for binding to tankyrase, leading to a further inhibition of the WNT pathway. In conclusions, Amot-p130 functions as a tumor suppressor gene in breast cancer, disrupting β-catenin stability by competing with Axin for binding to tankyrase. Amot-p130 was identified as a potential target for WNT pathway-targeted therapies in breast cancer.
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Peck C, Virtanen P, Johnson D, Kimble-Hill AC. Using the Predicted Structure of the Amot Coiled Coil Homology Domain to Understand Lipid Binding. ACTA ACUST UNITED AC 2018; 4:27-46. [PMID: 30957019 DOI: 10.14434/iujur.v4i1.24528] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Angiomotins (Amots) are a family of adapter proteins that modulate cellular polarity, differentiation, proliferation, and migration. Amot family members have a characteristic lipid-binding domain, the coiled coil homology (ACCH) domain that selectively targets the protein to membranes, which has been directly linked to its regulatory role in the cell. Several spot blot assays were used to validate the regions of the domain that participate in its membrane association, deformation, and vesicle fusion activity, which indicated the need for a structure to define the mechanism. Therefore, we sought to understand the structure-function relationship of this domain in order to find ways to modulate these signaling pathways. After many failed attempts to crystallize the ACCH domain of each Amot family member for structural analysis, we decided to pursue homologous models that could be refined using small angle x-ray scattering data. Theoretical models were produced using the homology software SWISS-MODEL and threading software I-TASSER and LOMETS, followed by comparison to SAXS data for model selection and refinement. We present a theoretical model of the domain that is driven by alpha helices and short random coil regions. These alpha helical regions form a classic dimer interface followed by two wide spread legs that we predict to be the lipid binding interface.
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11
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Moyon A, Garrigue P, Balasse L, Fernandez S, Brige P, Nollet M, Hache G, Blot-Chabaud M, Dignat-George F, Guillet B. Early prediction of revascularisation by angiomotin-targeting positron emission tomography. Theranostics 2018; 8:4985-4994. [PMID: 30429881 PMCID: PMC6217063 DOI: 10.7150/thno.27728] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Accepted: 08/10/2018] [Indexed: 12/11/2022] Open
Abstract
This study aimed to develop a PET imaging agent of angiomotin (AMOT) expression, a potential biomarker of functional tissue regeneration in post-ischaemic conditions. Methods: Hindlimb ischaemia was induced by ligature and resection of the right femoral artery in mice, and clinical score and limb perfusion were evaluated up to 30 days after surgery. AMOT expression was evaluated by histology and Western blot analysis. NODAGA-conjugates of AMOT ligand, sCD146, were designed, synthesised and radiolabelled with gallium-68. 68Ga-sCD146 microPET/CT imaging was performed from day 1 to day 30 after ischaemia. 68Ga-sCD146 specificity for AMOT was evaluated by autoradiography. Results: Immunohistochemistry showed a significant endothelial overexpression of AMOT from day 5 up to day 10 in the ischaemic hindlimb. 68Ga-sCD146 PET signal intensity correlated significantly with AMOT immunohistochemistry evaluation. 68Ga-sCD146 PET imaging showed a significant uptake in the ischaemic hindlimb from day 2 to day 15, peaking on day 5 (ipsi/contralateral ratio = 2.4 ± 1.3, P = 0.0005) and significantly decreased after pharmacological blocking (62.57 ± 11% decrease in PET signal P = 0.032). Finally, we observed a significant correlation between day 5 68Ga-sCD146 PET signal intensity and clinical recovery (day 28) or hindlimb perfusion recovery (day 30). Conclusions: This work reports for the first time an early and sustained increase in AMOT expression after hindlimb ischaemia in mice. We therefore developed an AMOT-targeting imaging agent, 68Ga-sCD146, and showed its specific uptake up to 21 days after ischaemic hindlimb using microPET imaging. Correlation of early post-ischaemic PET signal with both delayed perfusion recovery and clinical outcome allows us to postulate that 68Ga-sCD146 represents a promising radiotracer for tissue angiogenesis assessment.
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Kitamoto T, Sakurai K, Lee EY, Yokote K, Accili D, Miki T. Distinct roles of systemic and local actions of insulin on pancreatic β-cells. Metabolism 2018; 82:100-110. [PMID: 29320716 PMCID: PMC7391221 DOI: 10.1016/j.metabol.2017.12.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 12/16/2017] [Accepted: 12/31/2017] [Indexed: 12/23/2022]
Abstract
OBJECTIVE Pancreatic β-cell mass and function are critical in glucose homeostasis. Their regulatory mechanisms have been studied principally under experimental conditions of reduced β-cell numbers, such as β-cell ablation and partial pancreatectomy. In the present study, we generated an opposite mouse model with an excessive amount of ectopic β-cells, and analyzed its consequence on β-cell mass and survival. METHODS Mice underwent sub-renal transplantation (SRT) of pseudo-islets generated from a pancreatic β-cell line MIN6 or intra-pancreatic transplantation (IPT) of MIN6 cells, and morphological and functional changes of their endocrine pancreata were analyzed. Cellular fate of pancreatic β-cells after transplantation was traced using RipCre:Rosa26-tdTomato mice. By using MIN6 cells, we evaluated the roles of extracellular glucose, membrane potential, and insulin signaling on β-cell survival. RESULTS SRT mice developed severe, progressive hypoglycemia associated with marked reduction in insulin-positive (Ins+) cell mass and apparent increase in apoptotic Ins+ cells. In in vitro experiments of MIN6 cells, insulin signaling blockade potently induced cell death, suggesting that local insulin action is required for β-cell survival. In fact, IPT (i.e. transplantation close to endogenous β-cells) resulted in fewer apoptotic Ins+ cells compared with those induced by SRT. On the other hand, β-cell mass was decreased in proportion to the decrease in blood glucose levels in both SRT and IPT mice, suggesting a contribution of hypoglycemia induced by systemic hyperinsulinemia. CONCLUSION Insulin plays distinct roles in β-cell survival and β-cell mass regulation through its local and systemic actions on β-cells, respectively.
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Affiliation(s)
- Takumi Kitamoto
- Department of Medical Physiology, Chiba University, Graduate School of Medicine, Chiba 260-8670, Japan; Department of Clinical Cell Biology and Medicine, Chiba University, Graduate School of Medicine, Chiba 260-8670, Japan; Division of Endocrinology, Department of Medicine, Columbia University, New York 10032, USA
| | - Kenichi Sakurai
- Center for Preventive Medical Sciences, Chiba University, Chiba 263-8522, Japan
| | - Eun Young Lee
- Department of Medical Physiology, Chiba University, Graduate School of Medicine, Chiba 260-8670, Japan
| | - Koutaro Yokote
- Department of Clinical Cell Biology and Medicine, Chiba University, Graduate School of Medicine, Chiba 260-8670, Japan
| | - Domenico Accili
- Division of Endocrinology, Department of Medicine, Columbia University, New York 10032, USA
| | - Takashi Miki
- Department of Medical Physiology, Chiba University, Graduate School of Medicine, Chiba 260-8670, Japan.
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13
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Huang T, Zhou Y, Zhang J, Cheng ASL, Yu J, To KF, Kang W. The physiological role of Motin family and its dysregulation in tumorigenesis. J Transl Med 2018; 16:98. [PMID: 29650031 PMCID: PMC5898069 DOI: 10.1186/s12967-018-1466-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 03/28/2018] [Indexed: 11/30/2022] Open
Abstract
Members in Motin family, or Angiomotins (AMOTs), are adaptor proteins that localize in the membranous, cytoplasmic or nuclear fraction in a cell context-dependent manner. They control the bioprocesses such as migration, tight junction formation, cell polarity, and angiogenesis. Emerging evidences have demonstrated that AMOTs participate in cancer initiation and progression. Many of the previous studies have focused on the involvement of AMOTs in Hippo-YAP1 pathway. However, it has been controversial for years that AMOTs serve as either positive or negative growth regulators in different cancer types because of the various cellular origins. The molecular mechanisms of these opposite roles of AMOTs remain elusive. This review comprehensively summarized how AMOTs function physiologically and how their dysregulation promotes or inhibits tumorigenesis. Better understanding the functional roles of AMOTs in cancers may lead to an improvement of clinical interventions as well as development of novel therapeutic strategies for cancer patients.
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Affiliation(s)
- Tingting Huang
- Department of Anatomical and Cellular Pathology, State Key Laboratory of Oncology in South China, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong, People's Republic of China.,Institute of Digestive Disease, Partner State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong, People's Republic of China.,Li Ka Shing Institute of Health Science, Sir Y.K. Pao Cancer Center, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong, People's Republic of China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, People's Republic of China
| | - Yuhang Zhou
- Department of Anatomical and Cellular Pathology, State Key Laboratory of Oncology in South China, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong, People's Republic of China.,Institute of Digestive Disease, Partner State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong, People's Republic of China.,Li Ka Shing Institute of Health Science, Sir Y.K. Pao Cancer Center, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong, People's Republic of China
| | - Jinglin Zhang
- Department of Anatomical and Cellular Pathology, State Key Laboratory of Oncology in South China, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong, People's Republic of China.,Institute of Digestive Disease, Partner State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong, People's Republic of China.,Li Ka Shing Institute of Health Science, Sir Y.K. Pao Cancer Center, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong, People's Republic of China
| | - Alfred S L Cheng
- Institute of Digestive Disease, Partner State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong, People's Republic of China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, People's Republic of China.,School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong, People's Republic of China
| | - Jun Yu
- Institute of Digestive Disease, Partner State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong, People's Republic of China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, People's Republic of China.,Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong, People's Republic of China
| | - Ka Fai To
- Department of Anatomical and Cellular Pathology, State Key Laboratory of Oncology in South China, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong, People's Republic of China. .,Institute of Digestive Disease, Partner State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong, People's Republic of China. .,Li Ka Shing Institute of Health Science, Sir Y.K. Pao Cancer Center, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong, People's Republic of China. .,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, People's Republic of China.
| | - Wei Kang
- Department of Anatomical and Cellular Pathology, State Key Laboratory of Oncology in South China, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong, People's Republic of China. .,Institute of Digestive Disease, Partner State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong, People's Republic of China. .,Li Ka Shing Institute of Health Science, Sir Y.K. Pao Cancer Center, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong, People's Republic of China. .,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, People's Republic of China.
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Campbell CI, Samavarchi-Tehrani P, Barrios-Rodiles M, Datti A, Gingras AC, Wrana JL. The RNF146 and tankyrase pathway maintains the junctional Crumbs complex through regulation of angiomotin. J Cell Sci 2016; 129:3396-411. [PMID: 27521426 DOI: 10.1242/jcs.188417] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 07/22/2016] [Indexed: 12/11/2022] Open
Abstract
The Crumbs complex is an important determinant of epithelial apical-basal polarity that functions in regulation of tight junctions, resistance to epithelial-to-mesenchymal transitions and as a tumour suppressor. Although the functional role of the Crumbs complex is being elucidated, its regulation is poorly understood. Here, we show that suppression of RNF146, an E3 ubiquitin ligase that recognizes ADP-ribosylated substrates, and tankyrase, a poly(ADP-ribose) polymerase, disrupts the junctional Crumbs complex and disturbs the function of tight junctions. We show that RNF146 binds a number of polarity-associated proteins, in particular members of the angiomotin (AMOT) family. Accordingly, AMOT proteins are ADP-ribosylated by TNKS2, which drives ubiquitylation by RNF146 and subsequent degradation. Ablation of RNF146 or tankyrase, as well as overexpression of AMOT, led to the relocation of PALS1 (a Crumbs complex component) from the apical membrane to internal puncta, a phenotype that is rescued by AMOTL2 knockdown. We thus reveal a new function of RNF146 and tankyrase in stabilizing the Crumbs complex through downregulation of AMOT proteins at the apical membrane.
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Affiliation(s)
- Craig I Campbell
- Center for Systems Biology, Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada M5G 1X5
| | - Payman Samavarchi-Tehrani
- Center for Systems Biology, Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada M5G 1X5
| | - Miriam Barrios-Rodiles
- Center for Systems Biology, Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada M5G 1X5
| | - Alessandro Datti
- Center for Systems Biology, Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada M5G 1X5
| | - Anne-Claude Gingras
- Center for Systems Biology, Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada M5G 1X5 Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada M5S 1A8
| | - Jeffrey L Wrana
- Center for Systems Biology, Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada M5G 1X5 Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada M5S 1A8
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15
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Niu X, Chang W, Liu R, Hou R, Li J, Wang C, Li X, Zhang K. mRNA and protein expression of the angiogenesis-related genes EDIL3, AMOT and ECM1 in mesenchymal stem cells in psoriatic dermis. Clin Exp Dermatol 2015; 41:533-40. [PMID: 26644074 DOI: 10.1111/ced.12783] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/21/2015] [Indexed: 12/17/2022]
Abstract
BACKGROUND Dermal microvasculature expansion and angiogenesis are prominent in psoriasis. Our previous microarray study showed that the angiogenesis-related genes EDIL3 (epidermal growth factor-like repeats and discoidin I-like domains 3), AMOT (angiomotin) and ECM1 (extracellular matrix protein 1), had high expression levels in dermal mesenchymal stem cells (DMSCs) from psoriatic skin lesions. AIM To investigate the mRNA and protein expressions of EDIL3, AMOT and ECM1 in DMSCs derived from psoriatic skin in order to better determine the molecular mechanisms of angiogenesis in the skin. METHODS DMSCs from 12 patients with psoriasis and 14 healthy controls (HCs) were cultured to passage 3, and identified by morphology, immunophenotype and multipotential differentiation. The mRNA and protein expressions of EDIL3, AMOT, and ECM1 in the DMSCs were determined using real-time reverse transcription PCR and western blotting. RESULTS DMSCs displayed spindle-like morphology and surface protein expression, and were able to differentiate into osteoblasts, chondrocytes and adipocytes. mRNA expression analysis showed that EDIL3, AMOT and ECM1 were expressed at 2.54-fold, 2.11-fold, and 1.90-fold higher levels, respectively, in psoriatic DMSCs compared with HC DMSCs (all P < 0.05). Protein analysis showed significantly (all P < 0.01) higher concentrations of EDIL3, AMOT and ECM1in the psoriasis group than in the HC group. CONCLUSIONS Our data demonstrate for the first time that expression of EDIL3, AMOT and ECM1 is altered in DMSCs in psoriasis, suggesting that EDIL3, AMOT and ECM1 are involved in the excessive angiogenesis and vasodilation observed in psoriasis.
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Affiliation(s)
- X Niu
- Institute of Dermatology, Taiyuan City Central Hospital, Taiyuan, Shanxi, China
| | - W Chang
- Institute of Dermatology, Taiyuan City Central Hospital, Taiyuan, Shanxi, China
| | - R Liu
- Institute of Dermatology, Taiyuan City Central Hospital, Taiyuan, Shanxi, China
| | - R Hou
- Institute of Dermatology, Taiyuan City Central Hospital, Taiyuan, Shanxi, China
| | - J Li
- Institute of Dermatology, Taiyuan City Central Hospital, Taiyuan, Shanxi, China
| | - C Wang
- Laboratory Animal Center, Shanxi Medical University, Taiyuan, Shanxi, China
| | - X Li
- Institute of Dermatology, Taiyuan City Central Hospital, Taiyuan, Shanxi, China
| | - K Zhang
- Institute of Dermatology, Taiyuan City Central Hospital, Taiyuan, Shanxi, China
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LV MENG, LV MEILING, CHEN LING, QIN TIANJIE, ZHANG XIAO, LIU PEIJUN, YANG JIN. Angiomotin promotes breast cancer cell proliferation and invasion. Oncol Rep 2015; 33:1938-46. [DOI: 10.3892/or.2015.3780] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Accepted: 01/21/2015] [Indexed: 11/06/2022] Open
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17
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Takakusagi K, Takakusagi Y, Suzuki T, Toizaki A, Suzuki A, Kawakatsu Y, Watanabe M, Saito Y, Fukuda R, Nakazaki A, Kobayashi S, Sakaguchi K, Sugawara F. Multimodal biopanning of T7 phage-displayed peptides reveals angiomotin as a potential receptor of the anti-angiogenic macrolide Roxithromycin. Eur J Med Chem 2015; 90:809-21. [PMID: 25528335 DOI: 10.1016/j.ejmech.2014.12.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Revised: 12/06/2014] [Accepted: 12/09/2014] [Indexed: 02/07/2023]
Abstract
Roxithromycin (RXM) is a semi-synthetic fourteen-membered macrolide antibiotic that shows anti-angiogenic activity in solid tumors. In the present study, we conducted biopanning of T7 phage-displayed peptides either on a 96-well formatted microplate, a flow injection-type quartz-crystal microbalance (QCM) biosensor, or a cuvette-type QCM. RXM-selected peptides of different sequence, length and number were obtained from each mode of screening. Subsequent bioinformatics analysis of the RXM-selected peptides consistently gave positive scores for the extracellular domain (E458-T596) of angiomotin (Amot), indicating that this may comprise a binding region for RXM. Bead pull down assay and QCM analysis confirmed that RXM directly interacts with Amot via the screen-guided region, which also corresponds to the binding site for the endogenous anti-angiogenic inhibitor angiostatin (Anst). Thus, multimodal biopanning of T7PD revealed that RXM binds to the extracellular domain on Amot as a common binding site with Anst, leading to inhibition of angiogenesis-dependent tumor growth and metastasis. These data might explain the molecular basis underlying the mechanism of action for the anti-angiogenic activity of RXM.
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Affiliation(s)
- Kaori Takakusagi
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Yoichi Takakusagi
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
| | - Takahiro Suzuki
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Aya Toizaki
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Aiko Suzuki
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Yaichi Kawakatsu
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Madoka Watanabe
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Yukihiro Saito
- Meiwafosis Co. Ltd., 1-14-2 Shinjuku, Tokyo 160-0022, Japan
| | - Ryushi Fukuda
- Meiwafosis Co. Ltd., 1-14-2 Shinjuku, Tokyo 160-0022, Japan
| | - Atsuo Nakazaki
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Susumu Kobayashi
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Kengo Sakaguchi
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Fumio Sugawara
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
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18
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The Angiomotins--from discovery to function. FEBS Lett 2014; 588:2693-703. [PMID: 24548561 DOI: 10.1016/j.febslet.2014.02.006] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2014] [Revised: 02/05/2014] [Accepted: 02/06/2014] [Indexed: 12/13/2022]
Abstract
Angiomotins were originally identified as angiostatin binding proteins and implicated in the regulation of endothelial cell migration. Recent studies have shed light on the role of Angiomotins and other members of the Motin protein family in epithelial cells and in pathways directly linked to the pathogenesis of cancer. In particular, Motins have been shown to play a role in signaling pathways regulated by small G-proteins and the Hippo-YAP pathway. In this review the role of the Motin protein family in these signaling pathways will be described and open questions will be discussed.
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Byun JY, Lee SH, Shin JM, Baek BJ, Lee JY. Overexpression of angiomotin in sinonasal inverted papilloma. Int Forum Allergy Rhinol 2014; 4:512-6. [PMID: 24532565 DOI: 10.1002/alr.21293] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Revised: 12/11/2013] [Accepted: 12/12/2013] [Indexed: 01/29/2023]
Abstract
BACKGROUND Although inverted papilloma (IP) is one of the most common sinonasal tumors, its etiology and factors associated with tumor progression have not been fully determined. Generally, tumorigenesis or tumor growth requires angiogenesis to feed tumor cells. Angiomotin is a recently discovered protein that regulates migration and tubule formation in endothelial cells. It has been reported that angiomotin affects angiostatin (circulating inhibitor of angiogenesis), resulting in promotion of angiogenesis. Thus, we evaluated the expression and distribution of angiomotin in sinonasal IP, compared to normal control tissue. METHODS The study included 10 subjects with sinonasal IP and 5 normal controls. Ethmoid sinus mucosa obtained during reduction of blowout fractures was used as a normal control. Reverse transcriptase-polymerase chain reaction (RT-PCR), real-time PCR, immunohistochemistry, and Western blot analysis were used to assess the expression, intensity, and distribution of angiomotin in tissues. RESULTS Positive bands for angiomotin were seen in all specimens by RT-PCR. The expression level of angiomotin was significantly upregulated in IP tissues versus normal sinus mucosa by real-time PCR. Immunohistochemistry revealed positive reactions on endothelial cells of capillaries and small vessels within the tumor and normal tissues, but the positivity was significantly stronger in IP. Western blot analysis showed that expression levels of angiomotin were increased in IP compared to normal sinus mucosa. CONCLUSION Angiomotin, a novel protein in angiogenesis, was overexpressed in IP. Although it is not an etiological or initiating factor in tumor development, it seems to be associated with progression and growth of IP via promoting angiogenesis.
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Affiliation(s)
- Jang Yul Byun
- Department of Otorhinolaryngology-Head and Neck Surgery, Soonchunhyang University College of Medicine, Bucheon Hospital, Bucheon, Korea
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Yang J, Liu P, Tian M, Li Y, Chen W, Li X. Proteomic identification of angiomotin by ProteomeLab PF-2D and correlation with clinical outcome in human clear cell renal cell carcinoma. Int J Oncol 2013; 42:2078-86. [PMID: 23588948 DOI: 10.3892/ijo.2013.1889] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Accepted: 03/13/2013] [Indexed: 11/05/2022] Open
Abstract
Identification of new therapeutic and prognostic biomarkers for clear cell renal cell carcinoma (ccRCC) is urgently required since most patients are in advanced stages of ccRCC at initial diagnosis and the recurrence rate is high. Differentially expressed proteins between the ccRCC cell line RLC-310 and the normal renal cell line HK-2 were identified by a comparative proteomic approach based on a protein fractionation two-dimensional (PF-2D) liquid-phase fractionation system and capillary liquid chromatography electrospray ionization mass spectrometry/mass spectrometry (LC-ESI-MS/MS). Differentially expressed proteins (n=196) were identified. Of the 13 differentially expressed proteins newly discovered in ccRCC, angiomotin (Amot) was the focus of this study since its role in ccRCC progression has been obscure. The overexpression of Amot in ccRCC tissues was confirmed by comparing Amot expression in 18 primary ccRCC tissues and adjacent normal renal tissues (ANRT) using western blot analysis. Quantitative RT-PCR using 127 ccRCC tissues revealed that high levels of Amot transcripts were associated with poor differentiation, venous invasion and decreased survival (p<0.0001, <0.05 and <0.05). Multivariate analysis indicated that Amot transcript was an independent prognostic factor for the survival of ccRCC patients (p<0.05). These data suggest that Amot may serve as a novel prognostic factor of ccRCC.
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Affiliation(s)
- Jin Yang
- Medical Oncology Department, The First Affiliated Hospital, College of Medicine, Xi'an Jiaotong University, Xi'an 710061, P.R. China
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Zaidi M, Krolikowki JG, Jones DW, Pritchard KA, Struve J, Nandedkar SD, Lohr NL, Pagel PS, Weihrauch D. Transient repetitive exposure to low level light therapy enhances collateral blood vessel growth in the ischemic hindlimb of the tight skin mouse. Photochem Photobiol 2013; 89:709-13. [PMID: 23231468 DOI: 10.1111/php.12024] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Accepted: 11/21/2012] [Indexed: 11/28/2022]
Abstract
The tight skin mouse (Tsk(-/+)) is a model of scleroderma characterized by impaired vasoreactivity, increased oxidative stress, attenuated angiogenic response to VEGF and production of the angiogenesis inhibitor angiostatin. Low-level light therapy (LLLT) stimulates angiogenesis in myocardial infarction and chemotherapy-induced mucositis. We hypothesize that repetitive LLLT restores vessel growth in the ischemic hindlimb of Tsk(-/+) mice by attenuating angiostatin and enhancing angiomotin effects in vivo. C57Bl/6J and Tsk(-/+) mice underwent ligation of the femoral artery. Relative blood flow to the foot was measured using a laser Doppler imager. Tsk(-/+) mice received LLLT (670 nm, 50 mW cm(-2), 30 J cm(-2)) for 10 min per day for 14 days. Vascular density was determined using lycopersicom lectin staining. Immunofluorescent labeling, Western blot analysis and immunoprecipitation were used to determine angiostatin and angiomotin expression. Recovery of blood flow to the ischemic limb was reduced in Tsk(-/+) compared with C57Bl/6 mice 2 weeks after surgery. LLLT treatment of Tsk(-/+) mice restored blood flow to levels observed in C57Bl/6 mice. Vascular density was decreased, angiostatin expression was enhanced and angiomotin depressed in the ischemic hindlimb of Tsk(-/+) mice. LLLT treatment reversed these abnormalities. LLLT stimulates angiogenesis by increasing angiomotin and decreasing angiostatin expression in the ischemic hindlimb of Tsk(-/+) mice.
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Affiliation(s)
- Maria Zaidi
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, WI, USA
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Genetic polymorphism in a VEGF-independent angiogenesis gene ANGPT1 and overall survival of colorectal cancer patients after surgical resection. PLoS One 2012; 7:e34758. [PMID: 22496856 PMCID: PMC3319640 DOI: 10.1371/journal.pone.0034758] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Accepted: 03/05/2012] [Indexed: 01/18/2023] Open
Abstract
Background The VEGF-independent angiogenic signaling plays an important role in the development of colorectal cancer (CRC). However, its implication in the clinical outcome of CRC has not been reported. This study aimed to investigate the association between genetic variations in several major VEGF-independent signaling pathway genes and the overall survival of CRC patients. Methods Seven single nucleotide polymorphisms (SNPs) in four important VEGF-independent angiogenic genes (ANGPT1, AMOT, DLL4 and ENG) were genotyped in a Chinese population with 408 CRC patients. Results One SNP, rs1954727 in ANGPT1, was significantly associated with CRC overall survival. Compared to patients with the homozygous wild-type genotype of rs1954727, those with heterozygous and homozygous variant genotypes exhibited a favorable overall survival with a hazard ratio (HR) of 0.89 (95% confidence interval [CI] 0.55–1.43, P = 0.623), and 0.32 (95% CI 0.15–0.71, P = 0.005), respectively (P trend = 0.008). In stratified analysis, this association remained significant in patients receiving chemotherapy (P trend = 0.012), but not in those without chemotherapy. We further evaluated the effects of chemotherapy on CRC survival that was stratified by rs1954727 genotypes. We found that chemotherapy resulted in a significantly better overall survival in the CRC patients (HR = 0.44, 95% CI 0.26–0.75, P = 0.002), which was especially prominent in those patients with the heterozygous genotype of rs1954727 (HR = 0.45, 95%CI 0.22–0.92, P = 0.028). Conclusion Our data suggest that rs1954727 in ANGPT1 gene might be a prognostic biomarker for the overall survival of CRC patients, especially in those receiving chemotherapy, a finding that warrants validation in larger independent populations.
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Arigoni M, Barutello G, Lanzardo S, Longo D, Aime S, Curcio C, Iezzi M, Zheng Y, Barkefors I, Holmgren L, Cavallo F. A vaccine targeting angiomotin induces an antibody response which alters tumor vessel permeability and hampers the growth of established tumors. Angiogenesis 2012; 15:305-16. [PMID: 22426512 PMCID: PMC3338916 DOI: 10.1007/s10456-012-9263-3] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Accepted: 02/21/2012] [Indexed: 12/21/2022]
Abstract
Angiomotin (Amot) is one of several identified angiostatin receptors expressed by the endothelia of angiogenic tissues. We have shown that a DNA vaccine targeting Amot overcome immune tolerance and induce an antibody response that hampers the progression of incipient tumors. Following our observation of increased Amot expression on tumor endothelia concomitant with the progression from pre-neoplastic lesions to full-fledged carcinoma, we evaluated the effect of anti-Amot vaccination on clinically evident tumors. Electroporation of plasmid coding for the human Amot (pAmot) significantly delayed the progression both of autochthonous tumors in cancer prone BALB-neuT and PyMT genetically engineered mice and transplantable TUBO tumor in wild-type BALB/c mice. The intensity of the inhibition directly correlated with the titer of anti-Amot antibodies induced by the vaccine. Tumor inhibition was associated with an increase of vessels diameter with the formation of lacunar spaces, increase in vessel permeability, massive tumor perivascular necrosis and an effective epitope spreading that induces an immune response against other tumor associated antigens. Greater tumor vessel permeability also markedly enhances the antitumor effect of doxorubicin. These data provide a rationale for the development of novel anticancer treatments based on anti-Amot vaccination in conjunction with chemotherapy regimens.
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PIV5 M protein interaction with host protein angiomotin-like 1. Virology 2009; 397:155-66. [PMID: 19932912 DOI: 10.1016/j.virol.2009.11.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2009] [Revised: 09/29/2009] [Accepted: 11/02/2009] [Indexed: 12/14/2022]
Abstract
Paramyxovirus matrix (M) proteins organize virus assembly, functioning as adapters that link together viral ribonucleoprotein complexes and viral glycoproteins at infected cell plasma membranes. M proteins may also function to recruit and manipulate host factors to assist virus budding, similar to retroviral Gag proteins. By yeast two-hybrid screening, angiomotin-like 1 (AmotL1) was identified as a host factor that interacts with the M protein of parainfluenza virus 5 (PIV5). AmotL1-M protein interaction was observed in yeast, in transfected mammalian cells, and in virus-infected cells. Binding was mapped to a 83-amino acid region derived from the C-terminal portion of AmotL1. Overexpression of M-binding AmotL1-derived polypeptides potently inhibited production of PIV5 VLPs and impaired virus budding. Expression of these polypeptides moderately inhibited production of mumps VLPs, but had no effect on production of Nipah VLPs. siRNA-mediated depletion of AmotL1 protein reduced PIV5 budding, suggesting that this interaction is beneficial to paramyxovirus infection.
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Gagné V, Moreau J, Plourde M, Lapointe M, Lord M, Gagnon É, Fernandes MJG. Human angiomotin-like 1 associates with an angiomotin protein complex through its coiled-coil domain and induces the remodeling of the actin cytoskeleton. ACTA ACUST UNITED AC 2009; 66:754-68. [DOI: 10.1002/cm.20405] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Zheng Y, Vertuani S, Nyström S, Audebert S, Meijer I, Tegnebratt T, Borg JP, Uhlén P, Majumdar A, Holmgren L. Angiomotin-Like Protein 1 Controls Endothelial Polarity and Junction Stability During Sprouting Angiogenesis. Circ Res 2009; 105:260-70. [DOI: 10.1161/circresaha.109.195156] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Rationale:
We have previously shown that angiomotin (Amot) is essential for endothelial cell migration during mouse embryogenesis. However, ≈5% of Amot knockout mice survived without any detectable vascular defects. Angiomotin-like protein 1 (AmotL1) potentially compensates for the absence of Amot as it is 62% homologous to Amot and exhibits similar expression pattern in endothelial cells.
Objective:
Here, we report the identification of a novel isoform of AmotL1 that controls endothelial cell polarization and directional migration.
Methods and Results:
Small interfering RNA–mediated silencing of AmotL1 in mouse aortic endothelial cells caused a significant reduction in migration. In confluent mouse pancreatic islet endothelial cells (MS-1), AmotL1 colocalized with Amot to tight junctions. Small interfering RNA knockdown of both Amot and AmotL1 in MS-1 cells exhibited an additive effect on increasing paracellular permeability compared to that of knocking down either Amot or AmotL1, indicating both proteins were required for proper tight junction activity. Moreover, as visualized using high-resolution 2-photon microscopy, the morpholino-mediated knockdown of
amotl1
during zebrafish embryogenesis resulted in vascular migratory defect of intersegmental vessels with strikingly decreased junction stability between the stalk cells and the aorta. However, the phenotype was quite distinct from that of
amot
knockdown which affected polarization of the tip cells of intersegmental vessels. Double knockdown resulted in an additive phenotype of depolarized tip cells with no or decreased connection of the stalk cells to the dorsal aorta.
Conclusions:
These results cumulatively validate that Amot and AmotL1 have similar effects on endothelial migration and tight junction formation in vitro. However, in vivo Amot appears to control the polarity of vascular tip cells whereas AmotL1 mainly affects the stability of cell–cell junctions of the stalk cells.
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Affiliation(s)
- Yujuan Zheng
- From the Department of Oncology and Pathology (Y.Z., S.V., S.N., I.M., T.T., L.H.), Cancer Centrum Karolinska; and Laboratory of Molecular Neurobiology (P.U.) and Division of Matrix Biology (A.M.), Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden; and Institut National de la Santé et de la Recherche Médicale (S.A., J.-P.B.), U891, Centre de Recherche en Cancérologie de Marseille, Institut Paoli-Calmettes, Univ Méditerranée, Marseille, France
| | - Simona Vertuani
- From the Department of Oncology and Pathology (Y.Z., S.V., S.N., I.M., T.T., L.H.), Cancer Centrum Karolinska; and Laboratory of Molecular Neurobiology (P.U.) and Division of Matrix Biology (A.M.), Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden; and Institut National de la Santé et de la Recherche Médicale (S.A., J.-P.B.), U891, Centre de Recherche en Cancérologie de Marseille, Institut Paoli-Calmettes, Univ Méditerranée, Marseille, France
| | - Staffan Nyström
- From the Department of Oncology and Pathology (Y.Z., S.V., S.N., I.M., T.T., L.H.), Cancer Centrum Karolinska; and Laboratory of Molecular Neurobiology (P.U.) and Division of Matrix Biology (A.M.), Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden; and Institut National de la Santé et de la Recherche Médicale (S.A., J.-P.B.), U891, Centre de Recherche en Cancérologie de Marseille, Institut Paoli-Calmettes, Univ Méditerranée, Marseille, France
| | - Stéphane Audebert
- From the Department of Oncology and Pathology (Y.Z., S.V., S.N., I.M., T.T., L.H.), Cancer Centrum Karolinska; and Laboratory of Molecular Neurobiology (P.U.) and Division of Matrix Biology (A.M.), Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden; and Institut National de la Santé et de la Recherche Médicale (S.A., J.-P.B.), U891, Centre de Recherche en Cancérologie de Marseille, Institut Paoli-Calmettes, Univ Méditerranée, Marseille, France
| | - Inèz Meijer
- From the Department of Oncology and Pathology (Y.Z., S.V., S.N., I.M., T.T., L.H.), Cancer Centrum Karolinska; and Laboratory of Molecular Neurobiology (P.U.) and Division of Matrix Biology (A.M.), Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden; and Institut National de la Santé et de la Recherche Médicale (S.A., J.-P.B.), U891, Centre de Recherche en Cancérologie de Marseille, Institut Paoli-Calmettes, Univ Méditerranée, Marseille, France
| | - Tetyana Tegnebratt
- From the Department of Oncology and Pathology (Y.Z., S.V., S.N., I.M., T.T., L.H.), Cancer Centrum Karolinska; and Laboratory of Molecular Neurobiology (P.U.) and Division of Matrix Biology (A.M.), Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden; and Institut National de la Santé et de la Recherche Médicale (S.A., J.-P.B.), U891, Centre de Recherche en Cancérologie de Marseille, Institut Paoli-Calmettes, Univ Méditerranée, Marseille, France
| | - Jean-Paul Borg
- From the Department of Oncology and Pathology (Y.Z., S.V., S.N., I.M., T.T., L.H.), Cancer Centrum Karolinska; and Laboratory of Molecular Neurobiology (P.U.) and Division of Matrix Biology (A.M.), Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden; and Institut National de la Santé et de la Recherche Médicale (S.A., J.-P.B.), U891, Centre de Recherche en Cancérologie de Marseille, Institut Paoli-Calmettes, Univ Méditerranée, Marseille, France
| | - Per Uhlén
- From the Department of Oncology and Pathology (Y.Z., S.V., S.N., I.M., T.T., L.H.), Cancer Centrum Karolinska; and Laboratory of Molecular Neurobiology (P.U.) and Division of Matrix Biology (A.M.), Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden; and Institut National de la Santé et de la Recherche Médicale (S.A., J.-P.B.), U891, Centre de Recherche en Cancérologie de Marseille, Institut Paoli-Calmettes, Univ Méditerranée, Marseille, France
| | - Arindam Majumdar
- From the Department of Oncology and Pathology (Y.Z., S.V., S.N., I.M., T.T., L.H.), Cancer Centrum Karolinska; and Laboratory of Molecular Neurobiology (P.U.) and Division of Matrix Biology (A.M.), Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden; and Institut National de la Santé et de la Recherche Médicale (S.A., J.-P.B.), U891, Centre de Recherche en Cancérologie de Marseille, Institut Paoli-Calmettes, Univ Méditerranée, Marseille, France
| | - Lars Holmgren
- From the Department of Oncology and Pathology (Y.Z., S.V., S.N., I.M., T.T., L.H.), Cancer Centrum Karolinska; and Laboratory of Molecular Neurobiology (P.U.) and Division of Matrix Biology (A.M.), Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden; and Institut National de la Santé et de la Recherche Médicale (S.A., J.-P.B.), U891, Centre de Recherche en Cancérologie de Marseille, Institut Paoli-Calmettes, Univ Méditerranée, Marseille, France
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Budd S, Byfield G, Martiniuk D, Geisen P, Hartnett ME. Reduction in endothelial tip cell filopodia corresponds to reduced intravitreous but not intraretinal vascularization in a model of ROP. Exp Eye Res 2009; 89:718-27. [PMID: 19576214 DOI: 10.1016/j.exer.2009.06.011] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2009] [Revised: 06/22/2009] [Accepted: 06/24/2009] [Indexed: 10/20/2022]
Abstract
To determine the effect of a vascular endothelial growth factor receptor 2 tyrosine kinase (VEGFR2) inhibitor on intravitreous neovascularization (IVNV), endothelial tip cell filopodia, and intraretinal vascularization in a rat model of retinopathy of prematurity (ROP). Within 4h of birth, newborn Sprague-Dawley rat pups and their mothers were cycled between 50% and 10% oxygen daily until postnatal day (p)12. Pups were given intravitreous injections of VEGFR2 inhibitor, SU5416, or control (dimethyl sulfoxide, DMSO) and returned to oxygen cycling until p14, then placed into room air. Intravitreous neovascularization (IVNV), avascular/total retinal areas, and endothelial tip cell filopodial number and length were determined in lectin-labeled neurosensory retinal flat mounts. Cryosections or fresh tissue were analyzed for phospho-VEGFR1, phospho-VEGFR2, activated caspase-3, or phospho-beta3 integrin. Human umbilical venous (HUVECs) and human choroidal endothelial cells (ECs) were treated with VEGFR2 inhibitor to determine effect on VEGFR2 phosphorylation and on directed EC migration toward a VEGF gradient. Filopodial length and number of migrated ECs were also measured. Compared to control, the VEGFR2 inhibitor reduced VEGFR2 phosphorylation in HUVECs in vitro and clock hours and areas of IVNV but not percent avascular retina in vivo. Filopodial length and number of filopodia/EC tip cell were reduced in retinal flat mounts at doses that inhibited IVNV, whereas at lower doses, only a reduction in filopodial length/EC tip cell was found. There was no difference in phosphorylated beta3 integrin and cleaved caspase-3 labeling in VEGFR2 inhibitor-treated compared to control in vivo. Doses of the VEGFR2 inhibitor that reduced filopodial length and number of filopodia/migrating EC corresponded to reduced EC migration in in vitro models. VEGFR2 inhibitor reduced IVNV and filopodial number and length/EC tip cell without interfering with intraretinal vascularization. Reducing the number and length of filopodia/endothelial tip cell may reduce guidance cues for endothelial cells to migrate into the vitreous without interfering with migration into the retina toward a VEGF gradient.
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Affiliation(s)
- Steven Budd
- Department of Ophthalmology, University of North Carolina Chapel Hill, 103 Mason Farm Road, CB # 7041, 6135 NSRB, Chapel Hill, NC 27599, USA.
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Roudier E, Chapados N, Decary S, Gineste C, Le Bel C, Lavoie JM, Bergeron R, Birot O. Angiomotin p80/p130 ratio: a new indicator of exercise-induced angiogenic activity in skeletal muscles from obese and non-obese rats? J Physiol 2009; 587:4105-19. [PMID: 19546164 DOI: 10.1113/jphysiol.2009.175554] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Skeletal muscle capillarisation responds to physiological and pathological conditions with a remarkable plasticity. Angiomotin was recently identified as a new pro-angiogenic molecule. Angiomotin is expressed as two protein isoforms, p80 and p130. Whereas p80 stimulates endothelial cell migration and angiogenesis, p130 is rather characteristic of stabilized and matured vessels. To date, how angiomotin expression is physiologically regulated in vivo remains largely unknown. We thus investigated (1) whether angiomotin was physiologically expressed in skeletal muscle; (2) whether exercise training, known to stimulate muscle angiogenesis, affected angiomotin expression; and (3) whether such regulation was altered in obesity, a pathological situation often associated with an impaired angiogenic activity and some capillary rarefaction in skeletal muscle. Two models of obesity were used: a high fat diet regime and Zucker Diabetic Fatty rats (ZDF). Our results provide evidence that angiomotin was expressed both in capillaries and myofibres. In non-obese rats, the p80 isoform was increased in plantaris muscle in response to endurance training whereas p130 was unaffected. In obese animals, no change was observed for p80 whereas training significantly decreased p130 expression. Exercise training induced angiogenesis in plantaris from both obese and non-obese rats, possibly through the modulation of angiomotin level and its consequences on RhoA-ROCK signalling. In conclusion, any increase in p80 or decrease in p130, as respectively observed in non-obese and obese animals, led to an increased ratio between p80 and p130 isoforms. This increased angiomotin p80/p130 ratio might then directly reflect the enhanced angiogenic ability of skeletal muscle in response to exercise training.
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Affiliation(s)
- Emilie Roudier
- York University, Muscle Health Research Center, School of Kinesiology and Health Science, Norman Bethune College (Room 353), 4700 Keele Street, Toronto, ON, M3J 1P3, Canada
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Samén E, Thorell JO, Lu L, Tegnebratt T, Holmgren L, Stone-Elander S. Synthesis and preclinical evaluation of [(11)C]PAQ as a PET imaging tracer for VEGFR-2. Eur J Nucl Med Mol Imaging 2009; 36:1283-95. [PMID: 19288096 DOI: 10.1007/s00259-009-1111-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2008] [Accepted: 02/25/2009] [Indexed: 12/22/2022]
Abstract
PURPOSE (R,S)-N-(4-Bromo-2-fluorophenyl)-6-methoxy-7-((1-methyl-3-piperidinyl)methoxy)-4-quinazolinamine (PAQ) is a tyrosine kinase inhibitor with high affinity for the vascular endothelial growth factor receptor 2 (VEGFR-2), which plays an important role in tumour angiogenesis. The aim of this work was to develop and evaluate in mice the (11)C-labelled analogue as an in vivo tracer for VEGFR-2 expression in solid tumours. METHODS [(11)C]PAQ was synthesized by an N-methylation of desmethyl-PAQ using [(11)C]methyl iodide. The tracer's pharmacokinetic properties and its distribution in both subcutaneous and intraperitoneal tumour models were evaluated with positron emission tomography (PET). [(18)F]FDG was used as a reference tracer for tumour growth. PET results were corroborated by ex vivo and in vitro phosphor imaging and immunohistochemical analyses. RESULTS In vitro assays and PET in healthy animals revealed low tracer metabolism, limited excretion over 60 min and a saturable and irreversible binding. Radiotracer uptake in subcutaneous tumour masses was low, while focal areas of high uptake (up to 8% ID/g) were observed in regions connecting the tumour to the host. Uptake was similarly high but more distributed in tumours growing within the peritoneum. The pattern of radiotracer uptake was generally different from that of the metabolic tracer [(18)F]FDG and correlated well with variations in VEGFR-2 expression determined ex vivo by immunohistochemical analysis. CONCLUSION These results suggest that [(11)C]PAQ has potential as a noninvasive PET tracer for in vivo imaging of VEGFR-2 expression in angiogenic "hot spots".
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Affiliation(s)
- Erik Samén
- Karolinska Pharmacy, Karolinska University Hospital Solna, SE-17176, Stockholm, Sweden
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The Amot/Patj/Syx signaling complex spatially controls RhoA GTPase activity in migrating endothelial cells. Blood 2008; 113:244-53. [PMID: 18824598 DOI: 10.1182/blood-2008-04-153874] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Controlled regulation of Rho GTPase activity is an essential component mediating growth factor-stimulated migration. We have previously shown that angiomotin (Amot), a membrane-associated scaffold protein, plays a critical role during vascular patterning and endothelial migration during embryogenesis. However, the signaling pathways by which Amot controls directional migration are not known. Here we have used peptide pull-down and yeast 2-hybrid (Y2H) screening to identify proteins that interact with the C-terminal PDZ-binding motifs of Amot and its related proteins AmotL1 and 2. We report that Amot and its related proteins bind to the RhoA GTPase exchange factor (RhoGEF) protein Syx. We show that Amot forms a ternary complex together with Patj (or its paralogue Mupp1) and Syx. Using FRET analysis, we provide evidence that Amot controls targeting of RhoA activity to lamellipodia in vitro. We also report that, similar to Amot, morpholino knockdown of Syx in zebrafish results in inhibition of migration of intersegmental arteries. Taken together, our results indicate that the directional migration of capillaries in the embryo is governed by the Amot:Patj/Mupp1:Syx signaling that controls local GTPase activity.
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