1
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Cerqua M, Botti O, Arigoni M, Gioelli N, Serini G, Calogero R, Boccaccio C, Comoglio PM, Altintas DM. MET∆14 promotes a ligand-dependent, AKT-driven invasive growth. Life Sci Alliance 2022; 5:5/10/e202201409. [PMID: 35636967 PMCID: PMC9152130 DOI: 10.26508/lsa.202201409] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 05/13/2022] [Accepted: 05/17/2022] [Indexed: 11/24/2022] Open
Abstract
MET is an oncogene encoding the tyrosine kinase receptor for hepatocyte growth factor (HGF). Upon ligand binding, MET activates multiple signal transducers, including PI3K/AKT, STAT3, and MAPK. When mutated or amplified, MET becomes a "driver" for the onset and progression of cancer. The most frequent mutations in the MET gene affect the splicing sites of exon 14, leading to the deletion of the receptor's juxtamembrane domain (MET∆14). It is currently believed that, as in gene amplification, MET∆14 kinase is constitutively active. Our analysis of MET in carcinoma cell lines showed that MET∆14 strictly depends on HGF for kinase activation. Compared with wt MET, ∆14 is sensitive to lower HGF concentrations, with more sustained kinase response. Using three different models, we have demonstrated that MET∆14 activation leads to robust phosphorylation of AKT, leading to a distinctive transcriptomic signature. Functional studies revealed that ∆14 activation is predominantly responsible for enhanced protection from apoptosis and cellular migration. Thus, the unique HGF-dependent ∆14 oncogenic activity suggests consideration of HGF in the tumour microenvironment to select patients for clinical trials.
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Affiliation(s)
- Marina Cerqua
- Istituto Fondazione di Oncologia Molecolare - La Fondazione Italiana per la Ricerca sul Cancro (IFOM - FIRC) Institute of Molecular Oncology, Milano, Italy
| | - Orsola Botti
- Istituto Fondazione di Oncologia Molecolare - La Fondazione Italiana per la Ricerca sul Cancro (IFOM - FIRC) Institute of Molecular Oncology, Milano, Italy
| | - Maddalena Arigoni
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Noemi Gioelli
- Candiolo Cancer Institute-Fondazione del Piemonte per l'Oncologia, Istituto di Ricovero e Cura a Carattere Scientifico, Candiolo, Italy.,Department of Oncology, University of Torino School of Medicine, Turin, Italy
| | - Guido Serini
- Candiolo Cancer Institute-Fondazione del Piemonte per l'Oncologia, Istituto di Ricovero e Cura a Carattere Scientifico, Candiolo, Italy.,Department of Oncology, University of Torino School of Medicine, Turin, Italy
| | - Raffaele Calogero
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Carla Boccaccio
- Laboratory of Cancer Stem Cell Research, Candiolo Cancer Institute, Fondazione Piemontese per Oncologia - Istituti di Ricovero e Cura a Carattere Scientifico (FPO-IRCCS), Turin, Italy.,Department of Oncology, University of Turin Medical School, Turin, Italy
| | - Paolo M Comoglio
- Istituto Fondazione di Oncologia Molecolare - La Fondazione Italiana per la Ricerca sul Cancro (IFOM - FIRC) Institute of Molecular Oncology, Milano, Italy
| | - Dogus M Altintas
- Istituto Fondazione di Oncologia Molecolare - La Fondazione Italiana per la Ricerca sul Cancro (IFOM - FIRC) Institute of Molecular Oncology, Milano, Italy
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2
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Wilk SS, Zabielska-Koczywąs KA. Molecular Mechanisms of Canine Osteosarcoma Metastasis. Int J Mol Sci 2021; 22:3639. [PMID: 33807419 PMCID: PMC8036641 DOI: 10.3390/ijms22073639] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 03/24/2021] [Accepted: 03/26/2021] [Indexed: 02/06/2023] Open
Abstract
Osteosarcoma (OSA) represents the most common bone tumor in dogs. The malignancy is highly aggressive, and most of the dogs die due to metastasis, especially to the lungs. The metastatic process is complex and consists of several main steps. Assessment of the molecular mechanisms of metastasis requires in vitro and especially in vivo studies for a full evaluation of the process. The molecular and biological resemblance of canine OSA to its human counterpart enables the utilization of dogs as a spontaneous model of this disease in humans. The aim of the present review article is to summarize the knowledge of genes and proteins, including p63, signal transducer and activator of transcription 3 (STAT3), Snail2, ezrin, phosphorylated ezrin-radixin-moesin (p-ERM), hepatocyte growth factor-scatter factor (HGF-SF), epidermal growth factor receptor (EGFR), miR-9, and miR-34a, that are proven, by in vitro and/or in vivo studies, to be potentially involved in the metastatic cascade of canine OSA. The determination of molecular targets of metastatic disease may enhance the development of new therapeutic strategies.
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Affiliation(s)
| | - Katarzyna A. Zabielska-Koczywąs
- Department of Small Animal Diseases and Clinic, Institute of Veterinary Medicine, Warsaw University of Life Sciences, Nowoursynowska 159c, 02-776 Warsaw, Poland;
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3
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Zhang QW, Ye ZD, Shen C, Tie HX, Wang L, Shi L. Synthesis of novel 6,7-dimethoxy-4-anilinoquinolines as potent c-Met inhibitors. J Enzyme Inhib Med Chem 2018; 34:124-133. [PMID: 30422010 PMCID: PMC6237173 DOI: 10.1080/14756366.2018.1533822] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
HGF/c-Met signalling pathway plays an important role in the development of cancers. A series of 6,7-dimethoxy-4-anilinoquinolines possessing benzimidazole moiety were synthesised and identified as potent inhibitors of the tyrosine kinase c-Met. Their in vitro biological activities against three cancer cell lines (A549, MCF-7, and MKN-45) were also evaluated. Most of these compounds exhibited moderate to remarkable potency. Among them, compound 12n showed the most potent inhibitory activity against c-Met with IC50 value of 0.030 ± 0.008 µM and it also showed excellent anticancer activity against the tested cancer cell lines at low micromolar concentration. Molecular docking verified the results and revealed the possible binding mode of the most promising compound 12n into the ATP-binding site of c-Met kinase.
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Affiliation(s)
- Qing-Wen Zhang
- a Jiangsu Key Laboratory of Drug Design and Optimization, Department of Medicinal Chemistry , China Pharmaceutical University , Nanjing , P. R. China
| | - Zi-Dan Ye
- a Jiangsu Key Laboratory of Drug Design and Optimization, Department of Medicinal Chemistry , China Pharmaceutical University , Nanjing , P. R. China
| | - Chang Shen
- a Jiangsu Key Laboratory of Drug Design and Optimization, Department of Medicinal Chemistry , China Pharmaceutical University , Nanjing , P. R. China
| | - Hong-Xia Tie
- a Jiangsu Key Laboratory of Drug Design and Optimization, Department of Medicinal Chemistry , China Pharmaceutical University , Nanjing , P. R. China
| | - Lei Wang
- a Jiangsu Key Laboratory of Drug Design and Optimization, Department of Medicinal Chemistry , China Pharmaceutical University , Nanjing , P. R. China
| | - Lei Shi
- a Jiangsu Key Laboratory of Drug Design and Optimization, Department of Medicinal Chemistry , China Pharmaceutical University , Nanjing , P. R. China
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4
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Munblit D, Abrol P, Sheth S, Chow LY, Khaleva E, Asmanov A, Lauriola S, Padovani EM, Comberiati P, Boner AL, Warner JO, Boyle RJ, Peroni DG. Levels of Growth Factors and IgA in the Colostrum of Women from Burundi and Italy. Nutrients 2018; 10:E1216. [PMID: 30177587 PMCID: PMC6164593 DOI: 10.3390/nu10091216] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 08/24/2018] [Accepted: 08/27/2018] [Indexed: 12/26/2022] Open
Abstract
Colostrum is produced in the first days postpartum. It is a known source of immune mediators for a newborn within the first week of life. Although it is still unclear if colostrum composition varies between populations, recent data suggest differences. Hepatocyte growth factor (HGF); transforming growth factor-β (TGF-β) 1, 2, and 3; and immunoglobulin A (IgA) are key immunological components of colostrum that stimulate neonatal gastrointestinal and immune system development. We aimed to investigate the differences in the concentration between immune markers in the colostrum of mothers living in Burundi and Italy, and to identify the factors associated with differences. In this cross-sectional birth cohort study, a total of 99 colostrum samples from Burundian (n = 23) and Italian (n = 76) women were collected at 0 to 6 days postpartum. A clinical chemistry analyser was used for IgA quantification and electro-chemiluminescence, for HGF and TGFβ1-3 assessment. A univariate analysis and multivariate linear regression model were used for statistical testing. The concentrations of TGF-β2 (p = 0.01) and IgA (p < 0.01) were significantly higher in the colostrum from the women residing in Burundi than in Italy, both in a univariate analysis and upon the adjustment for confounding factors. A similar trend is seen for HGF, reaching statistical significance upon a multivariate analysis. We found a moderate to strong positive correlation between the TGF-β isoforms and IgA concentration in both countries (p < 0.01), with stronger concentration in the colostrum from Burundi. The results of this study are in support of previous data, suggesting that concentration of the immune active molecules is higher in the human milk of women residing in developing countries. However, with a small sample size, caution must be applied, as the findings require further confirmation. Future work should also be focused on other factors (e.g., lipid and microbial composition), as well as the investigation into colostrum and between populations comparison, adjusting for potential confounders.
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Affiliation(s)
- Daniel Munblit
- Department of Paediatrics, Imperial College London, London W2 1NY, UK.
- Faculty of Pediatrics, Sechenov University, 119991 Moscow, Russia.
- inVIVO Planetary Health, Group of the Worldwide Universities Network (WUN), 6010 Park Ave, West New York, NJ 07093, USA.
| | - Priya Abrol
- Department of Paediatrics, Imperial College London, London W2 1NY, UK.
| | - Shreya Sheth
- Department of Paediatrics, Imperial College London, London W2 1NY, UK.
| | - Li Yan Chow
- Department of Paediatrics, Imperial College London, London W2 1NY, UK.
| | - Ekaterina Khaleva
- inVIVO Planetary Health, Group of the Worldwide Universities Network (WUN), 6010 Park Ave, West New York, NJ 07093, USA.
- Department of Paediatrics, Saint-Petersburg State Paediatric Medical University, 194353 Saint-Petersburg, Russia.
| | - Alan Asmanov
- The Research and Clinical Institute for Pediatrics named after Academician Yuri Veltischev of the Pirogov Russian National Research Medical University, 125412 Moscow, Russia.
| | - Silvana Lauriola
- Department of Life and Reproduction Sciences, Section of Paediatrics, University of Verona, 37124 Verona, Italy.
| | - Ezio M Padovani
- Department of Life and Reproduction Sciences, Section of Paediatrics, University of Verona, 37124 Verona, Italy.
| | - Pasquale Comberiati
- Department of Life and Reproduction Sciences, Section of Paediatrics, University of Verona, 37124 Verona, Italy.
| | - Attilio L Boner
- Department of Life and Reproduction Sciences, Section of Paediatrics, University of Verona, 37124 Verona, Italy.
| | - John O Warner
- Department of Paediatrics, Imperial College London, London W2 1NY, UK.
- inVIVO Planetary Health, Group of the Worldwide Universities Network (WUN), 6010 Park Ave, West New York, NJ 07093, USA.
| | - Robert J Boyle
- Department of Paediatrics, Imperial College London, London W2 1NY, UK.
- inVIVO Planetary Health, Group of the Worldwide Universities Network (WUN), 6010 Park Ave, West New York, NJ 07093, USA.
| | - Diego G Peroni
- inVIVO Planetary Health, Group of the Worldwide Universities Network (WUN), 6010 Park Ave, West New York, NJ 07093, USA.
- Department of Clinical and Experimental Medicine, Section of Paediatrics, University of Pisa, 56126 Pisa, Italy.
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5
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Cascone T, Xu L, Lin HY, Liu W, Tran HT, Liu Y, Howells K, Haddad V, Hanrahan E, Nilsson MB, Cortez MA, Giri U, Kadara H, Saigal B, Park YY, Peng W, Lee JS, Ryan AJ, Jüergensmeier JM, Herbst RS, Wang J, Langley RR, Wistuba II, Lee JJ, Heymach JV. The HGF/c-MET Pathway Is a Driver and Biomarker of VEGFR-inhibitor Resistance and Vascular Remodeling in Non-Small Cell Lung Cancer. Clin Cancer Res 2017; 23:5489-5501. [PMID: 28559461 DOI: 10.1158/1078-0432.ccr-16-3216] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 04/19/2017] [Accepted: 05/23/2017] [Indexed: 12/26/2022]
Abstract
Purpose: Resistance to VEGFR inhibitors is a major obstacle in the treatment of non-small cell lung cancer (NSCLC). We investigated the cellular mechanisms mediating resistance of NSCLCs to VEGFR tyrosine kinase inhibitors.Experimental Design: We generated murine models of human NSCLC and performed targeted inhibition studies with the VEGFR TKIs cediranib and vandetanib. We used species-specific hybridization of microarrays to compare cancer (human) and stromal (mouse) cell transcriptomes of TKI-sensitive and -resistant tumors. We measured tumor microvascular density and vessel tortuosity to characterize the effects of therapy on the tumor vascular bed. Circulating cytokine and angiogenic factor levels in patients enrolled in VEGFR TKI trials were correlated with clinical outcomes.Results: Murine xenograft models of human lung adenocarcinoma were initially sensitive to VEGFR TKIs, but developed resistance to treatment. Species-specific microarray analysis identified increased expression of stromal-derived hepatocyte growth factor (HGF) as a candidate mediator of TKI resistance and its receptor, c-MET, was activated in cancer cells and tumor-associated stroma. A transient increase in hypoxia-regulated molecules in the initial response phase was followed by adaptive changes resulting in a more tortuous vasculature. Forced HGF expression in cancer cells reduced tumor sensitivity to VEGFR TKIs and produced tumors with tortuous blood vessels. Dual VEGFR/c-MET signaling inhibition delayed the onset of the resistant phenotype and prevented the vascular morphology alterations. In patients with cancer receiving VEGFR TKIs, high pretreatment HGF plasma levels correlated with poorer survival.Conclusions: HGF/c-MET pathway mediates VEGFR inhibitor resistance and vascular remodeling in NSCLC. Clin Cancer Res; 23(18); 5489-501. ©2017 AACR.
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Affiliation(s)
- Tina Cascone
- Division of Cancer Medicine and Department of Thoracic and Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Li Xu
- Division of Cancer Medicine and Department of Thoracic and Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Heather Y Lin
- Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Wenbin Liu
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Hai T Tran
- Division of Cancer Medicine and Department of Thoracic and Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Yuan Liu
- GlaxoSmithKline, Research Triangle Park, North Carolina and Collegeville, Pennsylvania
| | | | | | - Emer Hanrahan
- Division of Cancer Medicine and Department of Thoracic and Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Monique B Nilsson
- Division of Cancer Medicine and Department of Thoracic and Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Maria A Cortez
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Uma Giri
- Division of Cancer Medicine and Department of Thoracic and Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Humam Kadara
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas.,Department of Biochemistry and Molecular Genetics, Faculty of Medicine, American University of Beirut, Beirut, Lebanon
| | - Babita Saigal
- Division of Cancer Medicine and Department of Thoracic and Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Yun-Yong Park
- Department of Systems Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Weiyi Peng
- Department of Melanoma Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Ju-Seog Lee
- Department of Systems Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | | | | | - Roy S Herbst
- Section of Medical Oncology and Department of Developmental Therapeutics, Yale School of Medicine, New Haven, Connecticut
| | - Jing Wang
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Robert R Langley
- Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Ignacio I Wistuba
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Jack J Lee
- Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - John V Heymach
- Division of Cancer Medicine and Department of Thoracic and Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas. .,Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas
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6
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Esposito P, La Porta E, Calatroni M, Grignano MA, Milanesi S, Verzola D, Battaglia Y, Gregorini M, Libetta C, Garibotto G, Rampino T. Modulation of Myostatin/Hepatocyte Growth Factor Balance by Different Hemodialysis Modalities. BIOMED RESEARCH INTERNATIONAL 2017; 2017:7635459. [PMID: 28459069 PMCID: PMC5387812 DOI: 10.1155/2017/7635459] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Accepted: 03/20/2017] [Indexed: 02/07/2023]
Abstract
Background. In this study we investigated the relevance of myostatin and Hepatocyte Growth Factor (HGF) in patients undergoing hemodialysis HD and the influence of different HD modalities on their levels. Methods. We performed a prospective crossover study in which HD patients were randomized to undergo 3-month treatment periods with bicarbonate hemodialysis (BHD) followed by online hemodiafiltration (HDF). Clinical data, laboratory parameters, and myostatin and HGF serum levels were collected and compared. Results. Ten patients and six controls (C) were evaluated. In any experimental condition myostatin and HGF levels were higher in HD than in C. At enrollment and after BHD there were not significant correlations, whereas at the end of the HDF treatment period myostatin and HGF were inversely correlated (r -0.65, p < 0.05), myostatin serum levels inversely correlated with transferrin (r -0.73, p < 0.05), and HGF levels that resulted positively correlated with BMI (r 0.67, p < 0.05). Moving from BHD to HDF, clinical and laboratory parameters were unchanged, as well as serum HGF, whereas myostatin levels significantly decreased (6.3 ± 4.1 versus 4.3 ± 3.1 ng/ml, p < 0.05). Conclusions. Modulation of myostatin levels and myostatin/HGF balance by the use of different HD modalities might represent a novel approach to the prevention and treatment of HD-related muscle wasting syndrome.
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Affiliation(s)
- Pasquale Esposito
- 1Department of Nephrology, Dialysis and Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
- *Pasquale Esposito:
| | - Edoardo La Porta
- 1Department of Nephrology, Dialysis and Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
| | - Marta Calatroni
- 1Department of Nephrology, Dialysis and Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
| | - Maria Antonietta Grignano
- 1Department of Nephrology, Dialysis and Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
| | - Samantha Milanesi
- 1Department of Nephrology, Dialysis and Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
| | - Daniela Verzola
- 2Department of Internal Medicine, Istituto Nazionale per la Ricerca sul Cancro, University of Genoa and IRCCS Azienda Ospedaliera Universitaria San Martino-IST, Genoa, Italy
| | - Yuri Battaglia
- 3Nephrology and Dialysis Unit, St. Anna University Hospital, Ferrara, Italy
| | - Marilena Gregorini
- 1Department of Nephrology, Dialysis and Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
| | - Carmelo Libetta
- 1Department of Nephrology, Dialysis and Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
| | - Giacomo Garibotto
- 2Department of Internal Medicine, Istituto Nazionale per la Ricerca sul Cancro, University of Genoa and IRCCS Azienda Ospedaliera Universitaria San Martino-IST, Genoa, Italy
| | - Teresa Rampino
- 1Department of Nephrology, Dialysis and Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
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7
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Atanelishvili I, Shirai Y, Akter T, Noguchi A, Ash KT, Misra S, Ghatak S, Silver RM, Bogatkevich GS. D1398G Variant of MET Is Associated with Impaired Signaling of Hepatocyte Growth Factor in Alveolar Epithelial Cells and Lung Fibroblasts. PLoS One 2016; 11:e0162357. [PMID: 27584154 PMCID: PMC5008815 DOI: 10.1371/journal.pone.0162357] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Accepted: 08/22/2016] [Indexed: 02/07/2023] Open
Abstract
Pulmonary fibrosis represents the terminal stage of a diverse group of lung diseases including scleroderma associated interstitial lung disease. The molecular mechanisms underlying the pathogenesis of lung fibrosis are not well understood and there is a great need for more effective treatment for this lethal disease. We recently discovered a small fragment of hepatocyte growth factor (HGF) receptor MET as a peptide designated “M10,” with strong antifibrotic properties. Furthermore, we showed that aspartic acid at position 1398 of MET is essential for M10 generation. The current study was undertaken to investigate the D1398G variant of MET in which aspartic acid at position 1398 was mutated to glycine resulting in loss of M10. We demonstrate that lung fibroblasts, A549, and primary alveolar epithelial cells (AEC) expressing D1398G MET exhibit reduced auto-phosphorylation on tyrosine residues and reduced activation of Ras and MAPK. HGF treatment of scleroderma lung fibroblasts as well as HGF treatment of TGFβ-treated normal lung fibroblasts transfected with wild type MET is associated with decreased collagen, connective tissue growth factor (CTGF, CCN2) and smooth muscle α-actin (SMA). However, HGF has no such effects in cells transfected with MET D1398G. Cisplatin- and FasL-induced apoptosis is significantly reduced in AEC transfected with MET wild type, but not in AEC transfected with MET D1398G. We conclude that the D1398G variant of MET is associated with compromised phosphorylation and impaired HGF signaling in lung fibroblasts and AEC, two cell types implicated in the pathogenesis of pulmonary fibrosis associated with scleroderma. Ongoing studies will explore the frequency of this variant and its relationship to pulmonary outcomes in scleroderma patients.
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Affiliation(s)
- Ilia Atanelishvili
- Division of Rheumatology and Immunology, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina, United States of America
| | - Yuichiro Shirai
- Division of Rheumatology and Immunology, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina, United States of America
- Department of Allergy and Rheumatology, Nippon Medical School, Tokyo, Japan
| | - Tanjina Akter
- Division of Rheumatology and Immunology, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina, United States of America
| | - Atsushi Noguchi
- Division of Rheumatology and Immunology, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina, United States of America
| | - Kurt T. Ash
- Division of Rheumatology and Immunology, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina, United States of America
| | - Suniti Misra
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, South Carolina, United States of America
| | - Sibnath Ghatak
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, South Carolina, United States of America
| | - Richard M. Silver
- Division of Rheumatology and Immunology, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina, United States of America
| | - Galina S. Bogatkevich
- Division of Rheumatology and Immunology, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina, United States of America
- * E-mail:
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8
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Verma AK, Ghosh S, Pradhan S, Basu A. Microglial activation induces neuronal death in Chandipura virus infection. Sci Rep 2016; 6:22544. [PMID: 26931456 PMCID: PMC4773833 DOI: 10.1038/srep22544] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Accepted: 02/15/2016] [Indexed: 12/22/2022] Open
Abstract
Neurotropic viruses induce neurodegeneration either directly by activating host death domains or indirectly through host immune response pathways. Chandipura Virus (CHPV) belonging to family Rhabdoviridae is ranked among the emerging pathogens of the Indian subcontinent. Previously we have reported that CHPV induces neurodegeneration albeit the root cause of this degeneration is still an open question. In this study we explored the role of microglia following CHPV infection. Phenotypic analysis of microglia through lectin and Iba-1 staining indicated cells were in an activated state post CHPV infection in cortical region of the infected mouse brain. Cytokine Bead Array (CBA) analysis revealed comparatively higher cytokine and chemokine levels in the same region. Increased level of inducible nitric oxide synthase (iNOS), cyclooxygenase-2 (COX-2), Nitric Oxide (NO) and Reactive Oxygen species (ROS) in CHPV infected mouse brain indicated a strong inflammatory response to CHPV infection. Hence it was hypothesized through our analyses that this inflammatory response may stimulate the neuronal death following CHPV infection. In order to validate our hypothesis supernatant from CHPV infected microglial culture was used to infect neuronal cell line and primary neurons. This study confirmed the bystander killing of neurons due to activation of microglia post CHPV infection.
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Affiliation(s)
| | - Sourish Ghosh
- National Brain Research Centre, Manesar, Haryana-122051, India
| | | | - Anirban Basu
- National Brain Research Centre, Manesar, Haryana-122051, India
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9
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Mughal NA, Russell DA, Ponnambalam S, Homer-Vanniasinkam S. Gene therapy in the treatment of peripheral arterial disease. Br J Surg 2011; 99:6-15. [PMID: 22068822 DOI: 10.1002/bjs.7743] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/08/2011] [Indexed: 12/13/2022]
Abstract
BACKGROUND Peripheral arterial disease remains a significant global health burden despite revolutionary improvements in endovascular techniques over the past decade. The durability of intervention for critical limb ischaemia is poor, and the condition is associated with high morbidity and mortality rates. To address this deficiency, alternative therapeutic options are being explored. Advances in the fields of gene therapy and therapeutic angiogenesis have led to these being advocated as potential future treatments. METHODS Relevant medical literature from PubMed, Embase, the Cochrane Library and Google Scholar from the inception of these databases to June 2011 was reviewed. RESULTS Encouraging outcomes in preclinical trials using a variety of proangiogenic growth factors have led to numerous efficacy and safety studies. However, no clinical study has shown significant benefit for gene therapy over placebo. CONCLUSION Identifying the optimal site for gene delivery, choice of vector and duration of treatment is needed if gene therapy is to become a credible therapeutic option for peripheral arterial disease.
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Affiliation(s)
- N A Mughal
- Leeds Vascular Institute, Leeds General Infirmary, University of Leeds, Leeds, UK.
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Kwiecinski M, Noetel A, Elfimova N, Trebicka J, Schievenbusch S, Strack I, Molnar L, von Brandenstein M, Töx U, Nischt R, Coutelle O, Dienes HP, Odenthal M. Hepatocyte growth factor (HGF) inhibits collagen I and IV synthesis in hepatic stellate cells by miRNA-29 induction. PLoS One 2011; 6:e24568. [PMID: 21931759 PMCID: PMC3170366 DOI: 10.1371/journal.pone.0024568] [Citation(s) in RCA: 119] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Accepted: 08/15/2011] [Indexed: 12/14/2022] Open
Abstract
Background In chronic liver disease, hepatic stellate cells (HSC) transdifferentiate into myofibroblasts, promoting extracellular matrix (ECM) synthesis and deposition. Stimulation of HSC by transforming growth factor-β (TGF-β) is a crucial event in liver fibrogenesis due to its impact on myofibroblastic transition and ECM induction. In contrast, hepatocyte growth factor (HGF), exerts antifibrotic activities. Recently, miR-29 has been reported to be involved in ECM synthesis. We therefore studied the influence of HGF and TGF-β on the miR-29 collagen axis in HSC. Methodology HSC, isolated from rats, were characterized for HGF and Met receptor expression by Real-Time PCR and Western blotting during culture induced myofibroblastic transition. Then, the levels of TGF-β, HGF, collagen-I and -IV mRNA, in addition to miR-29a and miR-29b were determined after HGF and TGF-β stimulation of HSC or after experimental fibrosis induced by bile-duct obstruction in rats. The interaction of miR-29 with 3′-untranslated mRNA regions (UTR) was analyzed by reporter assays. The repressive effect of miR-29 on collagen synthesis was studied in HSC treated with miR-29-mimicks by Real-Time PCR and immunoblotting. Principal Findings The 3′-UTR of the collagen-1 and −4 subtypes were identified to bind miR-29. Hence, miR-29a/b overexpression in HSC resulted in a marked reduction of collagen-I and -IV synthesis. Conversely, a decrease in miR-29 levels is observed during collagen accumulation upon experimental fibrosis, in vivo, and after TGF-β stimulation of HSC, in vitro. Finally, we show that during myofibroblastic transition and TGF-β exposure the HGF-receptor, Met, is upregulated in HSC. Thus, whereas TGF-β stimulation leads to a reduction in miR-29 expression and de-repression of collagen synthesis, stimulation with HGF was definitely associated with highly elevated miR-29 levels and markedly repressed collagen-I and -IV synthesis. Conclusions Upregulation of miRNA-29 by HGF and downregulation by TGF-β take part in the anti- or profibrogenic response of HSC, respectively.
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Affiliation(s)
- Monika Kwiecinski
- Institute for Pathology, University Hospital Cologne, Cologne, Germany
| | - Andrea Noetel
- Institute for Pathology, University Hospital Cologne, Cologne, Germany
| | - Natalia Elfimova
- Institute for Pathology, University Hospital Cologne, Cologne, Germany
| | - Jonel Trebicka
- Department of Internal Medicine I, University of Bonn, Bonn, Germany
| | - Stephanie Schievenbusch
- Institute for Pathology, University Hospital Cologne, Cologne, Germany
- Department of Gastroenterology and Hepatology, University Hospital of Cologne, Cologne, Germany
| | - Ingo Strack
- Institute for Pathology, University Hospital Cologne, Cologne, Germany
| | - Levente Molnar
- Institute for Pathology, University Hospital Cologne, Cologne, Germany
| | | | - Ulrich Töx
- Department of Gastroenterology and Hepatology, University Hospital of Cologne, Cologne, Germany
| | - Roswitha Nischt
- Department of Dermatology, University Hospital of Cologne, Cologne, Germany
| | - Oliver Coutelle
- Department of Internal Medicine, University Hospital Cologne, Cologne, Germany
| | - Hans Peter Dienes
- Institute for Pathology, University Hospital Cologne, Cologne, Germany
| | - Margarete Odenthal
- Institute for Pathology, University Hospital Cologne, Cologne, Germany
- * E-mail:
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11
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Angiogenesis and multiple myeloma. CANCER MICROENVIRONMENT 2011; 4:325-37. [PMID: 21735169 DOI: 10.1007/s12307-011-0072-9] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2011] [Accepted: 06/23/2011] [Indexed: 01/13/2023]
Abstract
The bone marrow microenvironment in multiple myeloma is characterized by an increased microvessel density. The production of pro-angiogenic molecules is increased and the production of angiogenic inhibitors is suppressed, leading to an "angiogenic switch". Here we present an overview of the role of angiogenesis in multiple myeloma, the pro-angiogenic factors produced by myeloma cells and the microenvironment, and the mechanisms involved in the myeloma-induced angiogenic switch. Current data suggest that the increased bone marrow angiogenesis in multiple myeloma is due to the aberrant expression of angiogenic factors by myeloma cells, the subsequent increase in pro-angiogenic activity of normal plasma cells as a result of myeloma cell angiogenic activity, and the increased number of plasma cells overall. Hypoxia also contributes to the angiogenic properties of the myeloma marrow microenvironment. The transcription factor hypoxia-inducible factor-1α is overexpressed by myeloma cells and affects their transcriptional and angiogenic profiles. In addition, potential roles of the tumor suppressor gene inhibitor of growth family member 4 and homeobox B7 have also been recently highlighted as repressors of angiogenesis and pro-angiogenic related genes, respectively. This complex pathogenetic model of myeloma-induced angiogenesis suggests that several pro-angiogenic molecules and related genes in myeloma cells and the microenvironment are potential therapeutic targets.
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12
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Singh PK, Behrens ME, Eggers JP, Cerny RL, Bailey JM, Shanmugam K, Gendler SJ, Bennett EP, Hollingsworth MA. Phosphorylation of MUC1 by Met modulates interaction with p53 and MMP1 expression. J Biol Chem 2008; 283:26985-95. [PMID: 18625714 DOI: 10.1074/jbc.m805036200] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
MUC1, a transmembrane mucin, is a key modulator of several signaling pathways that affect oncogenesis, motility, and cell morphology. The interaction of MUC1 cytoplasmic tail (MUC1CT) with signal transducers and its nuclear translocation and subsequent biological responses are believed to be regulated by phosphorylation status, but the precise mechanisms by which this occurs remain poorly defined. We detected a novel association between the Met receptor tyrosine kinase and the MUC1CT. Met catalyzed phosphorylation of tyrosine at YHPM in the MUC1CT. Stimulation of S2-013.MUC1F pancreatic cancer cells with hepatocyte growth factor facilitated nuclear localization of MUC1CT, as determined by real time confocal imaging analysis. MUC1 overexpression also facilitated faster turnover of Met. Phosphorylation of MUC1CT by Met enhanced its interaction with p53, which led to suppression of AP1 transcription factor activity through interactions at the MMP1 promoter, ultimately leading to reduced transcription of MMP1. This correlated with a decrease in hepatocyte growth factor-induced invasiveness when MUC1 was overexpressed. The results demonstrate that MUC1 modulates Met-mediated oncogenic signaling in cancer.
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Affiliation(s)
- Pankaj K Singh
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198-6805, USA
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13
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Yu J, Ohuchida K, Mizumoto K, Ishikawa N, Ogura Y, Yamada D, Egami T, Fujita H, Ohashi S, Nagai E, Tanaka M. Overexpression of c-met in the early stage of pancreatic carcinogenesis; altered expression is not sufficient for progression from chronic pancreatitis to pancreatic cancer. World J Gastroenterol 2006; 12:3878-82. [PMID: 16804974 PMCID: PMC4087937 DOI: 10.3748/wjg.v12.i24.3878] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate c-met expression during early pancreatic carcinogenesis.
METHODS: We used 46 bulk tissues and 36 micro-dissected samples, including normal pancreas, chronic pancreatitis, and pancreatic cancer, for quantitative real-time reverse transcription-polymerase chain reaction.
RESULTS: In bulk tissue analyses, pancreatic cancer tissues expressed significantly higher levels of c-met than did chronic pancreatitis and normal pancreas tissues. c-met levels did not differ between chronic pancreatitis and normal pancreas tissues. In microdissection-based analyses, c-met was expressed at higher levels in microdissected pancreatic cancer cells and pancreatitis-affected epithelial cells than in normal ductal epithelial cells (both, P < 0.01). Interestingly, pancreatitis-affected epithelial cells expressed levels of c-met similar to those of pancreatic cancer cells.
CONCLUSION: Overexpression of c-met occurs during the early stage of pancreatic carcinogenesis, and a single alteration of c-met expression is not sufficient for progression of chronic pancreatitis-affected epithelial cells to pancreatic cancer cells.
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MESH Headings
- Biomarkers, Tumor/analysis
- Cell Line, Tumor
- Cell Transformation, Neoplastic
- Cells, Cultured
- DNA, Neoplasm/analysis
- DNA, Neoplasm/genetics
- Disease Progression
- Epithelial Cells/chemistry
- Epithelial Cells/cytology
- Epithelial Cells/pathology
- Fibroblasts/chemistry
- Fibroblasts/cytology
- Fibroblasts/pathology
- Gene Expression Regulation, Neoplastic
- Humans
- Pancreatic Neoplasms/chemistry
- Pancreatic Neoplasms/genetics
- Pancreatic Neoplasms/pathology
- Pancreatic Neoplasms/physiopathology
- Pancreatitis, Chronic/genetics
- Pancreatitis, Chronic/pathology
- Pancreatitis, Chronic/physiopathology
- Precancerous Conditions/chemistry
- Precancerous Conditions/genetics
- Precancerous Conditions/pathology
- Precancerous Conditions/physiopathology
- Proto-Oncogene Proteins c-met/metabolism
- RNA, Messenger/analysis
- RNA, Messenger/genetics
- Reverse Transcriptase Polymerase Chain Reaction
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Affiliation(s)
- Jun Yu
- Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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14
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De Luna N, Gallardo E, Illa I. In vivo and in vitro dysferlin expression in human muscle satellite cells. J Neuropathol Exp Neurol 2004; 63:1104-13. [PMID: 15535137 DOI: 10.1093/jnen/63.10.1104] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Dysferlin is a protein of the sarcolemma that is mutated in patients with limb girdle muscular dystrophy 2B, Miyoshi myopathy, and distal anterior myopathy. It has been implicated in muscle signaling and sarcolemma repair. To further understand its functional role we studied dysferlin expression in satellite cells (SCs) in normal and pathological human muscle biopsies, as well as in primary cultures of human skeletal muscle. Using immunohistochemistry we detected dysferlin-positive (Dysf+) SCs. Double staining with c-met+, a total SC marker, showed that the number of Dysf+ SCs ranged from 33.7% +/- 4.4% in normal muscle to 68.0% +/- 6.2% in pathological muscles, whereas double staining with MyoD/Dysf showed that all activated SC (MyoD+) were also Dysf+. These results indicate that dysferlin is upregulated in activated SCs. In vitro, immunohistochemistry, semiquantitative reverse transcriptase-polymerase chain reaction (RT-PCR), and real-time PCR showed that both dysferlin mRNA and protein expression were higher in multinucleated myotubes than in the myoblast stage (p < 0.05). Furthermore, experiments of inhibition of myoblast fusion with amiloride, a type T calcium channel antagonist, showed that dysferlin levels were lower in treated than in non-treated cultures (p < 0.001), demonstrating that dysferlin expression reached peak levels upon differentiation into myotubes. These results and the in vivo findings of dysferlin expression when SCs are activated confirm the involvement of dysferlin in human muscle regeneration/repair and its possible role in fusion events during muscle development.
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Affiliation(s)
- Noemí De Luna
- Servei de Neurologia i Laboratori de Neurologia Experimental, Hospital de la Santa Creu i Sant Pau, Universitat Autònoma de Barcelona, Barcelona, Spain
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15
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Hopkins AM, Bruewer M, Brown GT, Pineda AA, Ha JJ, Winfree LM, Walsh SV, Babbin BA, Nusrat A. Epithelial cell spreading induced by hepatocyte growth factor influences paxillin protein synthesis and posttranslational modification. Am J Physiol Gastrointest Liver Physiol 2004; 287:G886-98. [PMID: 15191880 DOI: 10.1152/ajpgi.00065.2004] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Superficial wounds in the gastrointestinal tract rapidly reseal by coordinated epithelial cell migration facilitated by cytokines such as hepatocyte growth factor (HGF)/scatter factor released in the wound vicinity. However, the mechanisms by which HGF promotes physiological and pathophysiologic epithelial migration are incompletely understood. Using in vitro models of polarized T84 and Caco-2 intestinal epithelia, we report that HGF promoted epithelial spreading and RhoA GTPase activation in a time-dependent manner. Inducible expression of enhanced green fluorescent protein-tagged dominant-negative RhoA significantly attenuated HGF-induced spreading. HGF expanded a zone of partially flattened cells behind the wound edge containing basal F-actin fibers aligned in the direction of spreading. Concomitantly, plaques positive for the focal adhesion protein paxillin were enhanced. HGF induced an increase in the translation of paxillin and, to a lesser extent, beta1-integrin. This was independent of cell-matrix adhesion through beta1-integrin. Subcellular fractionation revealed increased cosedimentation of paxillin with plasma membrane-containing fractions following HGF stimulation, without corresponding enhancements in paxillin coassociation with beta1 integrin or actin. Tyrosine phosphorylation of paxillin was reduced by HGF and was sensitive to the Src kinase inhibitor PP2. With these taken together, we propose that HGF upregulates a free cytosolic pool of paxillin that is unaffiliated with either the cytoskeleton or focal cell-matrix contacts. Thus early spreading responses to HGF may partly relate to increased paxillin availability for incorporation into, and turnover within, dynamic cytoskeletal/membrane complexes whose rapid and transient adhesion to the matrix drives migration.
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Affiliation(s)
- Ann M Hopkins
- Dept. of Pathology and Laboratory Medicine, Emory Univ., Rm. 105E, Whitehead Research Bldg., 615 Michael St., Atlanta, GA 30322, USA.
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16
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MacEwen EG, Pastor J, Kutzke J, Tsan R, Kurzman ID, Thamm DH, Wilson M, Radinsky R. IGF-1 receptor contributes to the malignant phenotype in human and canine osteosarcoma. J Cell Biochem 2004; 92:77-91. [PMID: 15095405 DOI: 10.1002/jcb.20046] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
To further define the role of insulin-like growth factor-1 (IGF-1) and its receptor (IGF-1R) in osteosarcoma (OS), human OS cell lines with low (SAOS-2) and high (SAOS-LM2) metastatic potential and three canine OS-derived cell lines were studied. Cell lines were evaluated for: IGF-1R expression; expression of IGF binding proteins (IGFBPs); effect of IGF-1 on tumor cell growth, invasion, expression of urokinase plasminogen activator (uPA), and soluble uPA receptor (suPAR), and; ectopic and orthotopic tumorigenicity of the canine OS cells in athymic mice. All cell lines exhibited steady-state mRNA expression of IGF-1R. The SAOS-2 and SAOS-LM2 cells expressed 9,138 and 10,234 cell-associated binding sites, respectively. Canine OS cells expressed from 1,728 to 3,883 binding sites. Two IGF-1-treated cell lines displayed enhanced proliferation. Two cell lines formed colonies in semisolid media, and IGF-1 increased colony number. Matrigel invasion was enhanced in one cell line following IGF-1 treatment. uPA and suPAR were unchanged in SAOS-2 and SAOS-LM2 cells following IGF-1 treatment, but the highly metastatic OS line SAOS-LM2 expressed five times more suPAR and displayed enhanced invasion compared to the parental, low metastatic SAOS-2. IGFBP-5 was detected in four of five cell lines, and IGFBP-3 was detected in two canine OS cell lines. Two canine OS lines were tumorigenic, and one metastasized spontaneously. In conclusion, OS cells express IGF-1R, which can contribute to their growth and invasion. There is suggestive evidence that increasing receptor number may contribute to in vivo tumorigenesis. Additional studies are needed to determine how IGF-1/IGF-1R interactions contribute to the malignant phenotype of OS.
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Affiliation(s)
- E Gregory MacEwen
- Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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17
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MacEwen EG, Kutzke J, Carew J, Pastor J, Schmidt JA, Tsan R, Thamm DH, Radinsky R. c-Met tyrosine kinase receptor expression and function in human and canine osteosarcoma cells. Clin Exp Metastasis 2003; 20:421-30. [PMID: 14524531 DOI: 10.1023/a:1025404603315] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
To further characterize the role of hepatocyte growth factor-scatter factor (HGF-SF) and its receptor (c-Met) in osteosarcoma (OS), human OS cell lines with low (SAOS-2) and high (SAOS-LM2) metastatic potential, and cell lines derived from spontaneous canine OS were studied. All cell lines were evaluated for c-Met and HGF-SF expression and receptor activation using Northern, RT-PCR, and Western blot analyses, respectively. Functional activity of receptor-ligand interaction was measured using c-Met phosphorylation status, proliferation assays (anchorage-dependent and -independent), Matrigel invasion, modulation of urokinase plasminogen activator (uPA) expression, and cell dispersion (scattering). All cell lines exhibited steady-state mRNA expression of c-Met. The canine OS cell lines also expressed HGF-SF mRNA as determined by RT-PCR analysis. Western analysis showed c-Met protein expression and HGF-stimulated (human) or constitutive (canine) receptor autophosphorylation. Treatment with recombinant human HGF resulted in enhanced proliferation in 3 of 5 OS cell lines and enhanced colony formation in 2 of 5 OS cell lines. Matrigel invasion was significantly enhanced in 3 of the cell lines and uPA levels were significantly increased in the SAOS-2 cells following HGF treatment. Scattering was enhanced in both the SAOS-2 and SAOS-LM2 cells. These data support the involvement of c-Met and HGF-SF in the growth and progression of human and canine OS, and may offer new targets for the development of therapeutic strategies for OS.
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Affiliation(s)
- E Gregory MacEwen
- Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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18
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Pediaditakis P, Monga SPS, Mars WM, Michalopoulos GK. Differential mitogenic effects of single chain hepatocyte growth factor (HGF)/scatter factor and HGF/NK1 following cleavage by factor Xa. J Biol Chem 2002; 277:14109-15. [PMID: 11832492 PMCID: PMC1821081 DOI: 10.1074/jbc.m112196200] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Hepatocyte growth factor/scatter factor (HGF/SF) is a multifunctional cytokine that is involved in many normal as well as pathological conditions. HGF/NK1, a splice variant of HGF/SF, has been reported to have either antagonistic or agonistic effects with regard to c-Met signaling depending on the cell type. In these experiments, we have determined that HGF/NK1 is a potent mitogen for rat hepatocytes in culture. Furthermore, we have found that coagulation factor Xa (fXa) is capable of cleaving HGF/NK1 and single chain HGF/SF (scHGF/SF). The products resulting from cleavage of HGF/NK1 or scHGF/SF by fXa appear as single bands under non-reducing conditions. The reaction products from the digestion of HGF/NK1 by fXa were separated under reducing conditions, and the cleavage site, as determined by N-terminal sequencing, was located C-terminal to arginine 134. Previous work established that the heparin-binding domain for HGF/SF is located in the N domain of HGF/SF. Additionally, the dimerization of the HGF/SF receptor (c-Met) by the ligand HGF/NK1 is facilitated by heparin and related sulfonated sugars on the cell surface, whereas heparin is not required for HGF/SF-mediated dimerization. Cleavage of single chain HGF/SF or HGF/NK1 by factor Xa does not alter the affinity of the respective molecules for heparin, but it did variably affect the associated mitogenic activity of these factors. The associated mitogenic activity of HGF/NK1 was reduced by more than 90%, whereas the mitogenic activity of scHGF/SF was unaffected. This suggests mandatory maintenance of a steric interaction of the N domain and the first kringle domain for HGF/NK1 to act as an agonist for rat hepatocyte growth but is not required by full-length HGF/SF.
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Affiliation(s)
| | | | | | - George K. Michalopoulos
- ‡ To whom correspondence should be addressed: Dept. of Pathology, University of Pittsburgh, 200 Desoto St., Pittsburgh, PA, 15261. Tel.: 412-648-1040; Fax: 412-648-1917; E-mail:
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Abstract
A number of growth factors and cognate receptors that contribute to normal kidney development have been shown to play roles in the pathogenesis of Wilms' tumours. Expression of both hepatocyte growth factor (HGF) and its tyrosine kinase receptor met has been demonstrated in normal tissues and their neoplastic counterparts, implicating these factors in normal development and tumour progression. HGF and met expression has not been studied in Wilms' tumour. Since HGF and met function in a paracrine fashion by regulating tubulogenesis in normal kidney development, they could be involved in the pathogenesis of Wilms' tumour, in which tubular formation is dysplastic. In the present study, a series of ten homotypic (consisting of blastemal, epithelial, and stromal elements) and ten heterotypic (consisting of triphasic histology and a muscle component) Wilms' tumour cases were examined for expression of HGF and met, using in situ hybridization, immunohistochemistry, and western blot analysis. Relatively high met message and protein expression, compared with normal kidney, were evident in homotypic and heterotypic tumour blastemal, epithelial, and rhabdomyoblastic cells and a 145 kD met polypeptide was found in all tumours, with a few cases also expressing the 170 kD precursor form. No apparent alterations of the met receptor were observed. Similarly, HGF protein was also abundantly expressed in blastemal, epithelial, and rhabdomyoblastic cells of the homotypic and heterotypic Wilms' tumours and a 69 kD HGF polypeptide was demonstrated by western blot analysis. Immunohistochemistry for the Ki-67 proliferation marker indicated that the pattern of Ki-67 expression correlated with the HGF and met pattern of expression in both homotypic and heterotypic tumours. These results reveal, for the first time, significant co-expression of met/HGF in Wilms' tumours, with a correspondingly high proliferative index in the same cell groups.
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Affiliation(s)
- Jennifer Alami
- Department of Paediatric Laboratory Medicine, Division of Pathology, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, M5G 1X8, Canada
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20
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Gorla Junior JA, Fagundes DJ, Parra OM, Zaia CTBV, Bandeira COP. Fatores hepatotróficos e regeneração hepática. Parte II: fatores de crescimento. Acta Cir Bras 2001. [DOI: 10.1590/s0102-86502001000400013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Várias substâncias identificáveis estão implicadas no processo de crescimento hepático, entre elas os fatores de crescimento. A maioria deles possui diferentes ações, estimulando a proliferação de células, ou mesmo inibindo na dependência de suas concentrações. Dentre os fatores de crescimento, ou somatomedinas, com ação sobre o fígado pode-se destacar: HGF; EGF; TGF-alpha; TGF b ; Interleucina 6; IGF; FGF; VEGF; KGF; HSS e ALR. A ação conjunta dos hormônios HGF, TGF-alpha, IL-6, TNF-alpha, norepinefrina, EGF, permite que insulina, glucagon e o próprio EGF manifestem seus efeitos. O HGF tem papel vital, talvez o principal "gatilho" deste processo, gerando um sinal endócrino que ativa fortemente a mitogênese nos hepatócitos já "preparados" pelo EGF, IL-6, insulina, matriz remanescente e outros, levando à síntese de DNA. Admite-se que o EGF também participe dos eventos iniciais do processo logo após a hepatectomia e que FGF, VEGF e KGF também participem dos eventos ligados à recomposição de outros tecidos.
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Hepatocyte Growth Factor/Scatter Factor Promotes Adhesion of Lymphoma Cells to Extracellular Matrix Molecules Via α4β1 and α5β1 Integrins. Blood 1997. [DOI: 10.1182/blood.v89.3.990] [Citation(s) in RCA: 78] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractHepatocyte growth factor (HGF )/scatter factor (SF ) is the ligand for a tyrosine kinase cell surface receptor encoded by the MET protooncogene (c-MET). HGF/SF can induce proliferation and motility in epithelial cells and promotes invasion of carcinoma cells and NIH3T3 fibroblasts transfected with both HGF/SF and c-MET genes. Our results show that HGF/SF and c-MET also play a role in adhesion and invasion of human lymphoma cells. c-MET mRNA is expressed in hemopoietic cells, such as hemopoietic progenitor cells (CD34+ cells) in bone marrow (BM) and mobilized peripheral blood, immature B cells in cord blood and BM, and germinal center B-centroblasts. In normal peripheral blood B cells, which are c-MET−, c-MET expression was induced by PMA, ConA, HGF/SF, and Epstein-Barr virus (EBV) infection. Using immunohistochemistry, we detected c-MET on the cell surface of large activated centroblasts in lymph nodes from patients with B-non–Hodgkin's lymphoma and Hodgkin's disease. In the latter group, c-MET expression correlated well with the presence of EBV. Because HGF/SF and c-MET promote metastasis of carcinoma cells, we studied the effects of c-MET stimulation by HGF/SF of B-lymphoma cells on properties relevant for metastasis, ie, adhesion, migration, and invasion. HGF/SF stimulated adhesion of the c-MET+ B-cell lines to the extracellular matrix molecules fibronectin (FN) and collagen (CN) in a dose dependent manner. However, adhesion to laminin was not affected by HGF/SF. Adhesion to FN was mediated by β1-integrins α4β1 (VLA4) and α5β1 (VLA5) since blocking antibodies against β1- (CD29), α4- (CD49d), or α5- (CD49e) integrin subunits, completely reversed the effect of HGF/SF. Furthermore, HGF/SF induced adhesion was abrogated by addition of genistein, which blocks protein tyrosine kinases, including c-MET. Addition of HGF/SF resulted in a sixfold increase in migration of c-MET B-lymphoma cells through Matrigel, compared to medium alone. In rat fibroblast cultures, HGF/SF doubled the number of c-MET+ B-lymphoma cells that invaded the fibroblast monolayer. In these adhesion, migration and invasion assays HGF/SF had no effect on c-MET− cell lines. In conclusion, c-MET is expressed or can be induced on immature, activated, and certain malignant B cells. HGF/SF increased adhesion of c-MET+ B-lymphoma cells to FN and CN, mediated via β1-integrins α4β1 and α5β1 , and furthermore promoted migration and invasion.
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22
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Naldini L, Vigna E, Bardelli A, Follenzi A, Galimi F, Comoglio PM. Biological activation of pro-HGF (hepatocyte growth factor) by urokinase is controlled by a stoichiometric reaction. J Biol Chem 1995; 270:603-11. [PMID: 7822285 DOI: 10.1074/jbc.270.2.603] [Citation(s) in RCA: 179] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Hepatocyte growth factor (HGF) is a paracrine inducer of morphogenesis and invasive growth in epithelial and endothelial cells. HGF is secreted by mesenchymal cells as an inactive precursor (pro-HGF). The crucial step for HGF activation is the extracellular hydrolysis of the Arg494-Val495 bond, which converts pro-HGF into alpha beta-HGF, the high-affinity ligand for the Met receptor. We previously reported that the urokinase-type plasminogen activator (uPA) activates pro-HGF in vitro. We now show that this is a stoichiometric reaction, and provide evidence for its occurrence in tissue culture. Activation involves the formation of a stable complex between pro-HGF and uPA. This complex was isolated from the in vitro reaction of pure uPA with recombinant pro-HGF, as well as from the membrane of target cells, after sequential addition of uPA and pro-HGF. On the cell membrane, the uPA-HGF complex was bound to the Met receptor. Monocytic cell lines, and primary monocytes after adhesion, activated efficiently pro-HGF both on their surface and in the culture medium. This activation was inhibited by anti-catalytic anti-uPA antibodies, and occurred by a stoichiometric reaction. The stoichiometry of the activation reaction suggests that the biological effects of HGF can be titrated in vivo by the level of uPA activity. Adequate amounts of uPA can be locally provided by the macrophages, which would condition the tissue microenvironment by rendering HGF bioavailable to its target cells.
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Affiliation(s)
- L Naldini
- Department of Biomedical Sciences and Oncology, University of Torino Medical School, Italy
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Liu ML, Mars WM, Zarnegar R, Michalopoulos GK. Collagenase pretreatment and the mitogenic effects of hepatocyte growth factor and transforming growth factor-alpha in adult rat liver. Hepatology 1994. [PMID: 8188184 DOI: 10.1002/hep.1840190630] [Citation(s) in RCA: 86] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Hepatocyte growth factor and transforming growth factor-alpha are two well-known hepatomitogens for primary hepatocyte cultures. Here we report that these two growth factors also stimulate in vivo DNA syntheses in normal, unoperated, adult rat liver after 24-hr continuous intraportal infusion. As determined by an immunohistochemical staining technique, 5-bromo-2'-deoxyuridine incorporation was increased in a dose-dependent fashion after infusion of up to 10 micrograms of growth factor/100 gm body weight in the rat. Stimulation of DNA synthesis was seen in the periportal area. Pretreatment using intraportal infusion of collagenase (1 U/kg body weight) for 4 hr before administration of growth factor increased the labeling by 2- to 4-fold to a labeling index range of 48% to 52%. These results suggest that collagenases and possibly other proteases are involved in making hepatocytes competent to respond to growth factors at very early stages of liver regeneration.
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Affiliation(s)
- M L Liu
- Department of Pathology, University of Pittsburgh School of Medicine, Pennsylvania 15261
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