1
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Strell C, Rodríguez-Tomàs E, Östman A. Functional and clinical roles of stromal PDGF receptors in tumor biology. Cancer Metastasis Rev 2024:10.1007/s10555-024-10194-7. [PMID: 38980580 DOI: 10.1007/s10555-024-10194-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Accepted: 06/12/2024] [Indexed: 07/10/2024]
Abstract
PDGF receptors play pivotal roles in both developmental and physiological processes through the regulation of mesenchymal cells involved in paracrine instructive interactions with epithelial or endothelial cells. Tumor biology studies, alongside analyses of patient tissue samples, provide strong indications that the PDGF signaling pathways are also critical in various types of human cancer. This review summarizes experimental findings and correlative studies, which have explored the biological mechanisms and clinical relevance of PDGFRs in mesenchymal cells of the tumor microenvironment. Collectively, these studies support the overall concept that the PDGF system is a critical regulator of tumor growth, metastasis, and drug efficacy, suggesting yet unexploited targeting opportunities. The inter-patient variability in stromal PDGFR expression, as being linked to prognosis and treatment responses, not only indicates the need for stratified approaches in upcoming therapeutic investigations but also implies the potential for the development of PDGFRs as biomarkers of clinical utility, interestingly also in settings outside PDGFR-directed treatments.
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Affiliation(s)
- Carina Strell
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
- Centre for Cancer Biomarkers CCBIO, Department of Clinical Medicine, Bergen University, Bergen, Norway
| | | | - Arne Östman
- Centre for Cancer Biomarkers CCBIO, Department of Clinical Medicine, Bergen University, Bergen, Norway.
- Department of Oncology-Pathology, Karolinska Institutet, Stockholm, Sweden.
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2
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Simmonds SJ, Grootaert MOJ, Cuijpers I, Carai P, Geuens N, Herwig M, Baatsen P, Hamdani N, Luttun A, Heymans S, Jones EAV. Pericyte loss initiates microvascular dysfunction in the development of diastolic dysfunction. EUROPEAN HEART JOURNAL OPEN 2024; 4:oead129. [PMID: 38174347 PMCID: PMC10763525 DOI: 10.1093/ehjopen/oead129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 11/27/2023] [Accepted: 11/30/2023] [Indexed: 01/05/2024]
Abstract
Aims Microvascular dysfunction has been proposed to drive heart failure with preserved ejection fraction (HFpEF), but the initiating molecular and cellular events are largely unknown. Our objective was to determine when microvascular alterations in HFpEF begin, how they contribute to disease progression, and how pericyte dysfunction plays a role herein. Methods and results Microvascular dysfunction, characterized by inflammatory activation, loss of junctional barrier function, and altered pericyte-endothelial crosstalk, was assessed with respect to the development of cardiac dysfunction, in the Zucker fatty and spontaneously hypertensive (ZSF1) obese rat model of HFpEF at three time points: 6, 14, and 21 weeks of age. Pericyte loss was the earliest and strongest microvascular change, occurring before prominent echocardiographic signs of diastolic dysfunction were present. Pericytes were shown to be less proliferative and had a disrupted morphology at 14 weeks in the obese ZSF1 animals, who also exhibited an increased capillary luminal diameter and disrupted endothelial junctions. Microvascular dysfunction was also studied in a mouse model of chronic reduction in capillary pericyte coverage (PDGF-Bret/ret), which spontaneously developed many aspects of diastolic dysfunction. Pericytes exposed to oxidative stress in vitro showed downregulation of cell cycle-associated pathways and induced a pro-inflammatory state in endothelial cells upon co-culture. Conclusion We propose pericytes are important for maintaining endothelial cell function, where loss of pericytes enhances the reactivity of endothelial cells to inflammatory signals and promotes microvascular dysfunction, thereby accelerating the development of HFpEF.
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Affiliation(s)
- Steven J Simmonds
- Centre for Molecular and Vascular Biology, KU Leuven, Herestraat 49, bus 911, Leuven 3000, Belgium
| | - Mandy O J Grootaert
- Centre for Molecular and Vascular Biology, KU Leuven, Herestraat 49, bus 911, Leuven 3000, Belgium
| | - Ilona Cuijpers
- Centre for Molecular and Vascular Biology, KU Leuven, Herestraat 49, bus 911, Leuven 3000, Belgium
- Department of Cardiology, Maastricht University, CARIM School for Cardiovascular Diseases, Universiteitssingel 50, Maastricht 6229 ER, The Netherlands
| | - Paolo Carai
- Centre for Molecular and Vascular Biology, KU Leuven, Herestraat 49, bus 911, Leuven 3000, Belgium
| | - Nadeche Geuens
- Centre for Molecular and Vascular Biology, KU Leuven, Herestraat 49, bus 911, Leuven 3000, Belgium
| | - Melissa Herwig
- Department of Cellular and Translational Physiology, Institute of Physiology, Ruhr University Bochum, Bochum 44801, Germany
- Molecular and Experimental Cardiology, Institut für Forschung und Lehre (IFL), Ruhr University Bochum, Bochum, Germany
- Department of Cardiology, St.Josef-Hospital, Ruhr University Bochum, Bochum, Germany
| | - Pieter Baatsen
- VIB-KU Leuven, Center for Brain and Disease Research, Electron Microscopy Platform & VIB Bioimaging Core, Leuven, Belgium
- Department of Neurosciences, Leuven Brain Institute, KU Leuven, Leuven, Belgium
| | - Nazha Hamdani
- Department of Cellular and Translational Physiology, Institute of Physiology, Ruhr University Bochum, Bochum 44801, Germany
- Molecular and Experimental Cardiology, Institut für Forschung und Lehre (IFL), Ruhr University Bochum, Bochum, Germany
- Department of Cardiology, St.Josef-Hospital, Ruhr University Bochum, Bochum, Germany
| | - Aernout Luttun
- Centre for Molecular and Vascular Biology, KU Leuven, Herestraat 49, bus 911, Leuven 3000, Belgium
| | - Stephane Heymans
- Centre for Molecular and Vascular Biology, KU Leuven, Herestraat 49, bus 911, Leuven 3000, Belgium
- Department of Cardiology, Maastricht University, CARIM School for Cardiovascular Diseases, Universiteitssingel 50, Maastricht 6229 ER, The Netherlands
| | - Elizabeth A V Jones
- Centre for Molecular and Vascular Biology, KU Leuven, Herestraat 49, bus 911, Leuven 3000, Belgium
- Department of Cardiology, Maastricht University, CARIM School for Cardiovascular Diseases, Universiteitssingel 50, Maastricht 6229 ER, The Netherlands
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3
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Orlich MM, Diéguez-Hurtado R, Muehlfriedel R, Sothilingam V, Wolburg H, Oender CE, Woelffing P, Betsholtz C, Gaengel K, Seeliger M, Adams RH, Nordheim A. Mural Cell SRF Controls Pericyte Migration, Vessel Patterning and Blood Flow. Circ Res 2022; 131:308-327. [PMID: 35862101 PMCID: PMC9348820 DOI: 10.1161/circresaha.122.321109] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Pericytes and vascular smooth muscle cells, collectively known as mural cells, are recruited through PDGFB (platelet-derived growth factor B)-PDGFRB (platelet-derived growth factor receptor beta) signaling. MCs are essential for vascular integrity, and their loss has been associated with numerous diseases. Most of this knowledge is based on studies in which MCs are insufficiently recruited or fully absent upon inducible ablation. In contrast, little is known about the physiological consequences that result from impairment of specific MC functions. Here, we characterize the role of the transcription factor SRF (serum response factor) in MCs and study its function in developmental and pathological contexts.
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Affiliation(s)
- Michael M. Orlich
- Department of Molecular Biology, Interfaculty Institute for Cell Biology, University of Tuebingen, Germany (M.M.O., C.E.O., P.W., A.N.)
- International Max Planck Research School (IMPRS) “From Molecules to Organisms,” Tuebingen, Germany (M.M.O., A.N.)
- Department of Immunology, Genetics and Pathology, Rudbeck Laboratory, Uppsala University, Sweden (M.M.O., C.B., K.G.)
- Now with Rudbeck Laboratory C11, Dag Hammarskjölds Väg 20, 751 85 Uppsala, Sweden (M.M.O.)
| | - Rodrigo Diéguez-Hurtado
- Department of Tissue Morphogenesis, Max Planck Institute for Molecular Biomedicine, Muenster, Germany (R.D.-H., R.H.A.)
- Faculty of Medicine, University of Muenster, Muenster, Germany (R.D.-H., R.H.A.)
| | - Regine Muehlfriedel
- Institute for Ophthalmic Research, Centre for Ophthalmology, University Clinic Tuebingen (UKT), Germany. (R.M., V.S., M.S.)
| | - Vithiyanjali Sothilingam
- Institute for Ophthalmic Research, Centre for Ophthalmology, University Clinic Tuebingen (UKT), Germany. (R.M., V.S., M.S.)
| | - Hartwig Wolburg
- Department of General Pathology and Pathological Anatomy, Institute of Pathology and Neuropathology, University Clinic Tuebingen (UKT), Germany. (H.W.)
| | - Cansu Ebru Oender
- Department of Molecular Biology, Interfaculty Institute for Cell Biology, University of Tuebingen, Germany (M.M.O., C.E.O., P.W., A.N.)
| | - Pascal Woelffing
- Department of Molecular Biology, Interfaculty Institute for Cell Biology, University of Tuebingen, Germany (M.M.O., C.E.O., P.W., A.N.)
| | - Christer Betsholtz
- Department of Immunology, Genetics and Pathology, Rudbeck Laboratory, Uppsala University, Sweden (M.M.O., C.B., K.G.)
| | - Konstantin Gaengel
- Department of Immunology, Genetics and Pathology, Rudbeck Laboratory, Uppsala University, Sweden (M.M.O., C.B., K.G.)
| | - Mathias Seeliger
- Institute for Ophthalmic Research, Centre for Ophthalmology, University Clinic Tuebingen (UKT), Germany. (R.M., V.S., M.S.)
| | - Ralf H. Adams
- Department of Tissue Morphogenesis, Max Planck Institute for Molecular Biomedicine, Muenster, Germany (R.D.-H., R.H.A.)
- Faculty of Medicine, University of Muenster, Muenster, Germany (R.D.-H., R.H.A.)
| | - Alfred Nordheim
- Department of Molecular Biology, Interfaculty Institute for Cell Biology, University of Tuebingen, Germany (M.M.O., C.E.O., P.W., A.N.)
- International Max Planck Research School (IMPRS) “From Molecules to Organisms,” Tuebingen, Germany (M.M.O., A.N.)
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4
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Vazquez-Liebanas E, Nahar K, Bertuzzi G, Keller A, Betsholtz C, Mäe MA. Adult-induced genetic ablation distinguishes PDGFB roles in blood-brain barrier maintenance and development. J Cereb Blood Flow Metab 2022; 42:264-279. [PMID: 34689641 PMCID: PMC8795218 DOI: 10.1177/0271678x211056395] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Platelet-derived growth factor B (PDGFB) released from endothelial cells is indispensable for pericyte recruitment during angiogenesis in embryonic and postnatal organ growth. Constitutive genetic loss-of-function of PDGFB leads to pericyte hypoplasia and the formation of a sparse, dilated and venous-shifted brain microvasculature with dysfunctional blood-brain barrier (BBB) in mice, as well as the formation of microvascular calcification in both mice and humans. Endothelial PDGFB is also expressed in the adult quiescent microvasculature, but here its importance is unknown. We show that deletion of Pdgfb in endothelial cells in 2-months-old mice causes a slowly progressing pericyte loss leading, at 12-18 months of age, to ≈50% decrease in endothelial:pericyte cell ratio, ≈60% decrease in pericyte longitudinal capillary coverage and >70% decrease in pericyte marker expression. Similar to constitutive loss of Pdgfb, this correlates with increased BBB permeability. However, in contrast to the constitutive loss of Pdgfb, adult-induced loss does not lead to vessel dilation, impaired arterio-venous zonation or the formation of microvascular calcifications. We conclude that PDFGB expression in quiescent adult microvascular brain endothelium is critical for the maintenance of pericyte coverage and normal BBB function, but that microvessel dilation, rarefaction, arterio-venous skewing and calcification reflect developmental roles of PDGFB.
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Affiliation(s)
- Elisa Vazquez-Liebanas
- Department of Immunology, Genetics, and Pathology, Rudbeck Laboratory, Uppsala University, Uppsala, Sweden
| | - Khayrun Nahar
- Department of Immunology, Genetics, and Pathology, Rudbeck Laboratory, Uppsala University, Uppsala, Sweden
| | - Giacomo Bertuzzi
- Department of Immunology, Genetics, and Pathology, Rudbeck Laboratory, Uppsala University, Uppsala, Sweden
| | - Annika Keller
- Department of Neurosurgery, Clinical Neurocentre, Zürich University Hospital, Zürich University, Zürich, Switzerland
| | - Christer Betsholtz
- Department of Immunology, Genetics, and Pathology, Rudbeck Laboratory, Uppsala University, Uppsala, Sweden.,Department of Medicine Huddinge, Karolinska Institute, Campus Flemingsberg, Huddinge, Sweden
| | - Maarja Andaloussi Mäe
- Department of Immunology, Genetics, and Pathology, Rudbeck Laboratory, Uppsala University, Uppsala, Sweden
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5
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Nellinger S, Schmidt I, Heine S, Volz A, Kluger PJ. Adipose stem cell‐derived extracellular matrix represents a promising biomaterial by inducing spontaneous formation of prevascular‐like structures by mvECs. Biotechnol Bioeng 2020; 117:3160-3172. [DOI: 10.1002/bit.27481] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 05/24/2020] [Accepted: 06/24/2020] [Indexed: 12/31/2022]
Affiliation(s)
- Svenja Nellinger
- Reutlingen Research Institute Reutlingen University Reutlingen Germany
| | - Isabelle Schmidt
- School of Applied Chemistry Reutlingen University Reutlingen Germany
| | - Simon Heine
- Reutlingen Research Institute Reutlingen University Reutlingen Germany
| | - Ann‐Cathrin Volz
- Reutlingen Research Institute Reutlingen University Reutlingen Germany
| | - Petra J. Kluger
- School of Applied Chemistry Reutlingen University Reutlingen Germany
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6
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Lendahl U, Nilsson P, Betsholtz C. Emerging links between cerebrovascular and neurodegenerative diseases-a special role for pericytes. EMBO Rep 2019; 20:e48070. [PMID: 31617312 PMCID: PMC6831996 DOI: 10.15252/embr.201948070] [Citation(s) in RCA: 81] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 06/11/2019] [Accepted: 06/24/2019] [Indexed: 12/11/2022] Open
Abstract
Neurodegenerative and cerebrovascular diseases cause considerable human suffering, and therapy options for these two disease categories are limited or non-existing. It is an emerging notion that neurodegenerative and cerebrovascular diseases are linked in several ways, and in this review, we discuss the current status regarding vascular dysregulation in neurodegenerative disease, and conversely, how cerebrovascular diseases are associated with central nervous system (CNS) degeneration and dysfunction. The emerging links between neurodegenerative and cerebrovascular diseases are reviewed with a particular focus on pericytes-important cells that ensheath the endothelium in the microvasculature and which are pivotal for blood-brain barrier function and cerebral blood flow. Finally, we address how novel molecular and cellular insights into pericytes and other vascular cell types may open new avenues for diagnosis and therapy development for these important diseases.
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Affiliation(s)
- Urban Lendahl
- Department of Cell and Molecular BiologyKarolinska InstitutetStockholmSweden
- Department of Neurobiology, Care Sciences and SocietyDivision of NeurogeriatricsCenter for Alzheimer ResearchKarolinska InstitutetSolnaSweden
- Integrated Cardio Metabolic Centre (ICMC)HuddingeSweden
| | - Per Nilsson
- Department of Neurobiology, Care Sciences and SocietyDivision of NeurogeriatricsCenter for Alzheimer ResearchKarolinska InstitutetSolnaSweden
| | - Christer Betsholtz
- Integrated Cardio Metabolic Centre (ICMC)HuddingeSweden
- Department of Immunology, Genetics and PathologyRudbeck LaboratoryUppsala UniversityUppsalaSweden
- Department of MedicineKarolinska InstitutetHuddingeSweden
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7
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Nahar K, Lebouvier T, Andaloussi Mäe M, Konzer A, Bergquist J, Zarb Y, Johansson B, Betsholtz C, Vanlandewijck M. Astrocyte-microglial association and matrix composition are common events in the natural history of primary familial brain calcification. Brain Pathol 2019; 30:446-464. [PMID: 31561281 PMCID: PMC7317599 DOI: 10.1111/bpa.12787] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 09/21/2019] [Indexed: 02/06/2023] Open
Abstract
Primary familial brain calcification (PFBC) is an age-dependent and rare neurodegenerative disorder characterized by microvascular calcium phosphate deposits in the deep brain regions. Known genetic causes of PFBC include loss-of-function mutations in genes involved in either of three processes-platelet-derived growth factor (PDGF) signaling, phosphate homeostasis or protein glycosylation-with unclear molecular links. To provide insight into the pathogenesis of PFBC, we analyzed murine models of PFBC for the first two of these processes in Pdgfbret/ret and Slc20a2-/- mice with regard to the structure, molecular composition, development and distribution of perivascular calcified nodules. Analyses by transmission electron microscopy and immunofluorescence revealed that calcified nodules in both of these models have a multilayered ultrastructure and occur in direct contact with reactive astrocytes and microglia. However, whereas nodules in Pdgfbret/ret mice were large, solitary and smooth surfaced, the nodules in Slc20a2-/- mice were multi-lobulated and occurred in clusters. The regional distribution of nodules also differed between the two models. Proteomic analysis and immunofluorescence stainings revealed a common molecular composition of the nodules in the two models, involving proteins implicated in bone homeostasis, but also proteins not previously linked to tissue mineralization. While the brain vasculature of Pdgfbret/ret mice has been reported to display reduced pericyte coverage and abnormal permeability, we found that Slc20a2-/- mice have a normal pericyte coverage and no overtly increased permeability. Thus, lack of pericytes and increase in permeability of the blood-brain barrier are likely not the causal triggers for PFBC pathogenesis. Instead, gene expression and spatial correlations suggest that astrocytes are intimately linked to the calcification process in PFBC.
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Affiliation(s)
- Khayrun Nahar
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - Thibaud Lebouvier
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden.,Department of Neurology, CHRU Lille, Lille, France.,Inserm U1171, Lille, France
| | - Maarja Andaloussi Mäe
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - Anne Konzer
- Scientific Service Group Mass Spectrometry, Max-Planck-Institute for Heart and Lung Research, Bad Nauheim, Germany
| | - Jonas Bergquist
- Department of Chemistry, Biomedical Centre, Uppsala University, Uppsala, Sweden
| | - Yvette Zarb
- Department of Neurosurgery, Clinical Neuroscience Center, Zurich University Hospital, Zurich University, Zurich, Switzerland.,Neuroscience Center Zurich (ZNZ), University of Zurich and ETH Zurich, Zurich, Switzerland
| | - Bengt Johansson
- Electron Microscopy Unit, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden
| | - Christer Betsholtz
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden.,Integrated Cardio Metabolic Centre (ICMC), Karolinska Institute, Huddinge, Sweden
| | - Michael Vanlandewijck
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden.,Integrated Cardio Metabolic Centre (ICMC), Karolinska Institute, Huddinge, Sweden
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8
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Chandler KB, Costello CE, Rahimi N. Glycosylation in the Tumor Microenvironment: Implications for Tumor Angiogenesis and Metastasis. Cells 2019; 8:E544. [PMID: 31195728 PMCID: PMC6627046 DOI: 10.3390/cells8060544] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 05/31/2019] [Accepted: 06/01/2019] [Indexed: 01/27/2023] Open
Abstract
Just as oncogene activation and tumor suppressor loss are hallmarks of tumor development, emerging evidence indicates that tumor microenvironment-mediated changes in glycosylation play a crucial functional role in tumor progression and metastasis. Hypoxia and inflammatory events regulate protein glycosylation in tumor cells and associated stromal cells in the tumor microenvironment, which facilitates tumor progression and also modulates a patient's response to anti-cancer therapeutics. In this review, we highlight the impact of altered glycosylation on angiogenic signaling and endothelial cell adhesion, and the critical consequences of these changes in tumor behavior.
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Affiliation(s)
- Kevin Brown Chandler
- Center for Biomedical Mass Spectrometry, Department of Biochemistry, Boston University School of Medicine, Boston, MA 02118, USA.
| | - Catherine E Costello
- Center for Biomedical Mass Spectrometry, Department of Biochemistry, Boston University School of Medicine, Boston, MA 02118, USA.
| | - Nader Rahimi
- Department of Pathology and Laboratory Medicine, Boston University School of Medicine, Boston, MA 02118, USA.
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9
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Tannenberg P, Chang YT, Muhl L, Laviña B, Gladh H, Genové G, Betsholtz C, Folestad E, Tran-Lundmark K. Extracellular retention of PDGF-B directs vascular remodeling in mouse hypoxia-induced pulmonary hypertension. Am J Physiol Lung Cell Mol Physiol 2018; 314:L593-L605. [PMID: 29212800 DOI: 10.1152/ajplung.00054.2017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Pulmonary hypertension (PH) is a lethal condition, and current vasodilator therapy has limited effect. Antiproliferative strategies targeting platelet-derived growth factor (PDGF) receptors, such as imatinib, have generated promising results in animal studies. Imatinib is, however, a nonspecific tyrosine kinase inhibitor and has in clinical studies caused unacceptable adverse events. Further studies are needed on the role of PDGF signaling in PH. Here, mice expressing a variant of PDGF-B with no retention motif ( Pdgfbret/ret), resulting in defective binding to extracellular matrix, were studied. Following 4 wk of hypoxia, right ventricular systolic pressure, right ventricular hypertrophy, and vascular remodeling were examined. Pdgfbret/ret mice did not develop PH, as assessed by hemodynamic parameters. Hypoxia did, however, induce vascular remodeling in Pdgfbret/ret mice; but unlike the situation in controls where the remodeling led to an increased concentric muscularization of arteries, the vascular remodeling in Pdgfbret/ret mice was characterized by a diffuse muscularization, in which cells expressing smooth muscle cell markers were found in the interalveolar septa detached from the normally muscularized intra-acinar vessels. Additionally, fewer NG2-positive perivascular cells were found in Pdgfbret/ret lungs, and mRNA analyses showed significantly increased levels of Il6 following hypoxia, a known promigratory factor for pericytes. No differences in proliferation were detected at 4 wk. This study emphasizes the importance of extracellular matrix-growth factor interactions and adds to previous knowledge of PDGF-B in PH pathobiology. In summary, Pdgfbret/ret mice have unaltered hemodynamic parameters following chronic hypoxia, possibly secondary to a disorganized vascular muscularization.
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Affiliation(s)
- Philip Tannenberg
- Department of Molecular Medicine and Surgery, Karolinska Institutet , Stockholm , Sweden.,Department of Medical Biochemistry and Biophysics, Karolinska Institutet , Stockholm , Sweden
| | - Ya-Ting Chang
- Department of Molecular Medicine and Surgery, Karolinska Institutet , Stockholm , Sweden.,Department of Pediatrics, Chang Gung Memorial Hospital , Taoyuan , Taiwan
| | - Lars Muhl
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet , Stockholm , Sweden.,Integrated Cardio Metabolic Centre, Department of Medicine, Karolinska Institutet, Huddinge, Sweden
| | - Bàrbara Laviña
- Department of Immunology, Genetics, and Pathology, Rudbeck Laboratory, Uppsala University , Uppsala , Sweden
| | - Hanna Gladh
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet , Stockholm , Sweden
| | - Guillem Genové
- Integrated Cardio Metabolic Centre, Department of Medicine, Karolinska Institutet, Huddinge, Sweden
| | - Christer Betsholtz
- Department of Immunology, Genetics, and Pathology, Rudbeck Laboratory, Uppsala University , Uppsala , Sweden.,Integrated Cardio Metabolic Centre, Department of Medicine, Karolinska Institutet, Huddinge, Sweden
| | - Erika Folestad
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet , Stockholm , Sweden
| | - Karin Tran-Lundmark
- Department of Molecular Medicine and Surgery, Karolinska Institutet , Stockholm , Sweden.,Department of Experimental Medical Science, Lund University , Lund , Sweden
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10
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Huang SS, Li YW, Wu JL, Johnson FE, Huang JS. Development of the LYVE-1 gene with an acidic-amino-acid-rich (AAAR) domain in evolution is associated with acquisition of lymph nodes and efficient adaptive immunity. J Cell Physiol 2018; 233:2681-2692. [PMID: 28833090 PMCID: PMC6123220 DOI: 10.1002/jcp.26159] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Accepted: 08/17/2017] [Indexed: 12/13/2022]
Abstract
CRSBP-1 (mammalian LYVE-1) is a membrane glycoprotein highly expressed in lymphatic endothelial cells (LECs). It has multiple ligands, including hyaluronic acid (HA) and growth factors/cytokines (e.g., PDGF-BB and VEGF-A) containing CRS motifs (clusters of basic amino-acid residues). The ligand binding activities are mediated by Link module and acidic-amino-acid-rich (AAAR) domains, respectively. These CRSBP-1/LYVE-1 ligands have been shown to induce opening of lymphatic intercellular junctions in LEC monolayers and in lymphatic vessels in wild-type mice. We hypothesize that CRSBP-1/LYVE-1 ligands, particularly CRS-containing growth factors/cytokines, are secreted by immune and cancer cells for lymphatic entry during adaptive immune responses and lymphatic metastasis. We have looked into the origin of the Link module and AAAR domain of LYVE-1 in evolution and its association with the development of lymph nodes and efficient adaptive immunity. Lymph nodes represent the only major recent innovation of the adaptive immune systems in evolution particularly to mammals and bird. Here we demonstrate that the development of the LYVE-1 gene with the AAAR domain in evolution is associated with acquisition of lymph nodes and adaptive immunity. LYVE-1 from other species, which have no lymph nodes, lack the AAAR domain and efficient adaptive immunity. Synthetic CRSBP-1 ligands PDGF and VEGF peptides, which contain the CRS motifs of PDGF-BB and VEGF-A, respectively, specifically bind to CRSBP-1 but do not interact with either PDGFβR or VEGFR2. These peptides function as adjuvants by enhancing adaptive immunity of pseudorabies virus (PRV) vaccine in pigs. These results support the notion that LYVE-1 is involved in adaptive immunity in mammals.
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Affiliation(s)
| | - Ya-Wen Li
- Graduate Institute of Life Sciences, National Defense Medical Center and Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, Taiwan
| | - Jen-Leih Wu
- Graduate Institute of Life Sciences, National Defense Medical Center and Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, Taiwan
| | - Frank E Johnson
- Department of Surgery, Saint Louis University Medical Center, St. Louis, Missouri
| | - Jung San Huang
- Department of Biochemistry and Molecular Biology, Doisy Research Center, Saint Louis University School of Medicine, St. Louis, Missouri
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11
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Allam A, Thomsen AR, Gothwal M, Saha D, Maurer J, Brunner TB. Pancreatic stellate cells in pancreatic cancer: In focus. Pancreatology 2017; 17:514-522. [PMID: 28601475 DOI: 10.1016/j.pan.2017.05.390] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Revised: 05/23/2017] [Accepted: 05/24/2017] [Indexed: 12/11/2022]
Abstract
Pancreatic stellate cells are stromal cells that have multiple physiological functions such as the production of extracellular matrix, stimulation of amylase secretion, phagocytosis and immunity. In pancreatic cancer, stellate cells exhibit a different myofibroblastic-like morphology with the expression of alpha-smooth muscle actin, the activated form is engaged in several mechanisms that support tumorigenesis and cancer invasion and progression. In contrast to the aforementioned observations, eliminating the stromal cells that are positive for alpha-smooth muscle actin resulted in immune-evasion of the cancer cells and resulted in worse prognosis in animal models. Understanding the cancer-stromal signaling in pancreatic adenocarcinoma will provide novel strategies for therapy. Here we provide an updated review of studies that handle the topic "pancreatic stellate cells in cancer" and recent experimental approaches that can be the base for future directions in therapy.
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Affiliation(s)
- A Allam
- Department of Radiation Oncology, Medical Center, Faculty of Medicine, University of Freiburg, Germany; Clinical Oncology and Nuclear Medicine Department, Assiut University Hospitals, Egypt
| | - A R Thomsen
- Department of Radiation Oncology, Medical Center, Faculty of Medicine, University of Freiburg, Germany; German Cancer Consortium (DKTK), Partner Site Freiburg, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - M Gothwal
- Department of Radiation Oncology, Medical Center, Faculty of Medicine, University of Freiburg, Germany; German Cancer Consortium (DKTK), Partner Site Freiburg, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - D Saha
- Department of Visceral Surgery, Medical Center, Faculty of Medicine, University of Freiburg, Germany
| | - J Maurer
- Department of Visceral Surgery, Medical Center, Faculty of Medicine, University of Freiburg, Germany; German Cancer Consortium (DKTK), Partner Site Freiburg, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - T B Brunner
- Department of Radiation Oncology, Medical Center, Faculty of Medicine, University of Freiburg, Germany; German Cancer Consortium (DKTK), Partner Site Freiburg, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany.
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12
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Caporali A, Martello A, Miscianinov V, Maselli D, Vono R, Spinetti G. Contribution of pericyte paracrine regulation of the endothelium to angiogenesis. Pharmacol Ther 2016; 171:56-64. [PMID: 27742570 DOI: 10.1016/j.pharmthera.2016.10.001] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
During physiological development and after a stressor event, vascular cells communicate with each other to evoke new vessel formation-a process known as angiogenesis. This communication occurs via direct contact and via paracrine release of proteins and nucleic acids, both in a free form or encapsulated into micro-vesicles. In diseases with an altered angiogenic response, such as cancer and diabetic vascular complications, it becomes of paramount importance to tune the cell communication process. Endothelial cell growth and migration are essential processes for new vessel formation, and pericytes, together with some classes of circulating monocytes, are important endothelial regulators. The interaction between pericytes and the endothelium is facilitated by their anatomical apposition, which involves endothelial cells and pericytes sharing the same basement membrane. However, the role of pericytes is not fully understood. The characteristics and the function of tissue-specific pericytesis are the focus of this review. Factors involved in the cross-talk between these cell types and the opportunities afforded by micro-RNA and micro-vesicle techniques are discussed. Targeting these mechanisms in pathological conditions, in which the vessel response is altered, is considered in relation to identification of new therapies for restoring the blood flow.
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Affiliation(s)
- A Caporali
- University/BHF Centre for Cardiovascular Science, University of Edinburgh, Edinburgh, UK
| | - A Martello
- University/BHF Centre for Cardiovascular Science, University of Edinburgh, Edinburgh, UK
| | - V Miscianinov
- University/BHF Centre for Cardiovascular Science, University of Edinburgh, Edinburgh, UK
| | - D Maselli
- IRCCS MultiMedica, Milan, Italy; Dipartimento di Scienze Biomediche, Università di Sassari, Sassari, Italy
| | - R Vono
- IRCCS MultiMedica, Milan, Italy
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13
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Martino MM, Brkic S, Bovo E, Burger M, Schaefer DJ, Wolff T, Gürke L, Briquez PS, Larsson HM, Gianni-Barrera R, Hubbell JA, Banfi A. Extracellular matrix and growth factor engineering for controlled angiogenesis in regenerative medicine. Front Bioeng Biotechnol 2015; 3:45. [PMID: 25883933 PMCID: PMC4381713 DOI: 10.3389/fbioe.2015.00045] [Citation(s) in RCA: 126] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Accepted: 03/19/2015] [Indexed: 01/22/2023] Open
Abstract
Blood vessel growth plays a key role in regenerative medicine, both to restore blood supply to ischemic tissues and to ensure rapid vascularization of clinical-size tissue-engineered grafts. For example, vascular endothelial growth factor (VEGF) is the master regulator of physiological blood vessel growth and is one of the main molecular targets of therapeutic angiogenesis approaches. However, angiogenesis is a complex process and there is a need to develop rational therapeutic strategies based on a firm understanding of basic vascular biology principles, as evidenced by the disappointing results of initial clinical trials of angiogenic factor delivery. In particular, the spatial localization of angiogenic signals in the extracellular matrix (ECM) is crucial to ensure the proper assembly and maturation of new vascular structures. Here, we discuss the therapeutic implications of matrix interactions of angiogenic factors, with a special emphasis on VEGF, as well as provide an overview of current approaches, based on protein and biomaterial engineering that mimic the regulatory functions of ECM to optimize the signaling microenvironment of vascular growth factors.
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Affiliation(s)
- Mikaël M Martino
- Host Defense, Immunology Frontier Research Center, Osaka University , Osaka , Japan
| | - Sime Brkic
- Cell and Gene Therapy, Department of Biomedicine, Basel University , Basel , Switzerland ; Department of Surgery, Basel University Hospital , Basel , Switzerland
| | - Emmanuela Bovo
- Cell and Gene Therapy, Department of Biomedicine, Basel University , Basel , Switzerland ; Department of Surgery, Basel University Hospital , Basel , Switzerland
| | - Maximilian Burger
- Cell and Gene Therapy, Department of Biomedicine, Basel University , Basel , Switzerland ; Department of Surgery, Basel University Hospital , Basel , Switzerland ; Plastic, Reconstructive, Aesthetic and Hand Surgery, Department of Surgery, Basel University Hospital , Basel , Switzerland
| | - Dirk J Schaefer
- Plastic, Reconstructive, Aesthetic and Hand Surgery, Department of Surgery, Basel University Hospital , Basel , Switzerland
| | - Thomas Wolff
- Cell and Gene Therapy, Department of Biomedicine, Basel University , Basel , Switzerland ; Department of Surgery, Basel University Hospital , Basel , Switzerland ; Vascular Surgery, Department of Surgery, Basel University Hospital , Basel , Switzerland
| | - Lorenz Gürke
- Vascular Surgery, Department of Surgery, Basel University Hospital , Basel , Switzerland
| | - Priscilla S Briquez
- Institute of Bioengineering, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne (EPFL) , Lausanne , Switzerland
| | - Hans M Larsson
- Institute of Bioengineering, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne (EPFL) , Lausanne , Switzerland
| | - Roberto Gianni-Barrera
- Cell and Gene Therapy, Department of Biomedicine, Basel University , Basel , Switzerland ; Department of Surgery, Basel University Hospital , Basel , Switzerland
| | - Jeffrey A Hubbell
- Institute of Bioengineering, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne (EPFL) , Lausanne , Switzerland ; Institute for Molecular Engineering, University of Chicago , Chicago, IL , USA ; Argonne National Laboratory, Materials Science Division , Argonne, IL , USA
| | - Andrea Banfi
- Cell and Gene Therapy, Department of Biomedicine, Basel University , Basel , Switzerland ; Department of Surgery, Basel University Hospital , Basel , Switzerland
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Huang W, Kim HRC. Dynamic regulation of platelet-derived growth factor D (PDGF-D) activity and extracellular spatial distribution by matriptase-mediated proteolysis. J Biol Chem 2015; 290:9162-70. [PMID: 25678707 DOI: 10.1074/jbc.m114.610865] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Indexed: 01/17/2023] Open
Abstract
The oncogenic roles of PDGF-D and its proteolytic activator, matriptase, have been strongly implicated in human prostate cancer. Latent full-length PDGF-D (FL-D) consists of a CUB domain, a growth factor domain (GFD), and the hinge region in between. Matriptase processes the FL-D dimer into a GFD dimer (GFD-D) in a stepwise manner, involving generation of a hemidimer (HD), an intermediate product containing one FL-D subunit and one GFD subunit. Although the HD is a pro-growth factor that can be processed into the GFD-D by matriptase, the HD can also act as a dominant-negative ligand that prevents PDGF-B-mediated β-PDGF receptor activation in fibroblasts. The active GFD-D can be further cleaved into a smaller and yet inactive form if matriptase-mediated proteolysis persists. Through mutagenesis and functional analyses, we found that the R(340)R(341)GR(343)A (P4-P1/P1') motif within the GFD is the matriptase cleavage site through which matriptase can deactivate PDGF-D. Comparative sequence analysis based on the published crystal structure of PDGF-B predicted that the matriptase cleavage site R(340)R(341)GR(343)A is within loop III of the GFD, a critical structural element for its binding with the β-PDGF receptor. Interestingly, we also found that matriptase processing regulates the deposition of PDGF-D dimer species into the extracellular matrix (ECM) with increased binding from the FL-D dimer, to the HD, and to the GFD-D. Furthermore, we provide evidence that R(340)R(341)GR(343)A within the GFD is critical for PDGF-D deposition and binding to the ECM. In this study, we report a structural element crucial for the biological function and ECM deposition of PDGF-D and provide molecular insight into the dynamic functional interplay between the serine protease matriptase and PDGF-D.
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Affiliation(s)
- Wei Huang
- From the Department of Pathology, Barbara Ann Karmanos Cancer Institute, Wayne State University School of Medicine, Detroit, Michigan 48201
| | - Hyeong-Reh Choi Kim
- From the Department of Pathology, Barbara Ann Karmanos Cancer Institute, Wayne State University School of Medicine, Detroit, Michigan 48201
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15
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Andrae J, Gouveia L, He L, Betsholtz C. Characterization of platelet-derived growth factor-A expression in mouse tissues using a lacZ knock-in approach. PLoS One 2014; 9:e105477. [PMID: 25166724 PMCID: PMC4148317 DOI: 10.1371/journal.pone.0105477] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Accepted: 07/24/2014] [Indexed: 12/22/2022] Open
Abstract
Expression of the platelet-derived growth factor A-chain gene (Pdgfa) occurs widely in the developing mouse, where it is mainly localized to various epithelial and neuronal structures. Until now, in situ mRNA hybridization (ISH) has been the only reliable method to identify Pdgfa expression in tissue sections or whole mount preparations. Validated protocols for in situ detection of PDGF-A protein by immunohistochemistry is lacking. In particular, this has hampered understanding of Pdgfa expression pattern in adult tissues, where ISH is technically challenging. Here, we report a gene targeted mouse Pdgfa allele, Pdgfaex4COIN, which is a combined conditional knockout and reporter allele. Cre-mediated inversion of the COIN cassette inactivates Pdgfa coding while simultaneously activating a beta-galactosidase (lacZ) reporter under endogenous Pdgfa transcription control. The generated Pdgfaex4COIN-INV-lacZ allele can next be used to identify cells carrying a Pdgfa null allele, as well as to map endogenous Pdgfa expression. We evaluated the Pdgfaex4COIN-INV-lacZ allele as a reporter for endogenous Pdgfa expression patterns in mouse embryos and adults. We conclude that the expression pattern of Pdgfaex4COIN-INV-lacZ recapitulates known expression patterns of Pdgfa. We also report on novel embryonic and adult Pdgfa expression patterns in the mouse and discuss their implications for Pdgfa physiology.
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Affiliation(s)
- Johanna Andrae
- Department of Immunology, Genetics and Pathology, Rudbeck Laboratory, Uppsala University, Uppsala, Sweden
- * E-mail:
| | - Leonor Gouveia
- Department of Immunology, Genetics and Pathology, Rudbeck Laboratory, Uppsala University, Uppsala, Sweden
| | - Liqun He
- Department of Immunology, Genetics and Pathology, Rudbeck Laboratory, Uppsala University, Uppsala, Sweden
| | - Christer Betsholtz
- Department of Immunology, Genetics and Pathology, Rudbeck Laboratory, Uppsala University, Uppsala, Sweden
- Department of Medical Biochemistry and Biophysics, Division of Vascular Biology, Karolinska Institute, Stockholm, Sweden
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16
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van Wijk XMR, van Kuppevelt TH. Heparan sulfate in angiogenesis: a target for therapy. Angiogenesis 2013; 17:443-62. [PMID: 24146040 DOI: 10.1007/s10456-013-9401-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Accepted: 10/15/2013] [Indexed: 01/02/2023]
Abstract
Heparan sulfate (HS), a long linear polysaccharide of alternating disaccharide residues, interacts with a wide variety of proteins, including many angiogenic factors. The involvement of HS in signaling of pro-angiogenic factors (e.g. vascular endothelial growth factor and fibroblast growth factor 2), as well as interaction with anti-angiogenic factors (e.g. endostatin), warrants its role as an important modifier of (tumor) angiogenesis. This review summarizes our current understanding of the role of HS in angiogenic growth factor signaling, and discusses therapeutic strategies to target HS and modulate angiogenesis.
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Affiliation(s)
- Xander M R van Wijk
- Department of Biochemistry (280), Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, PO. Box 9101, 6500 HB, Nijmegen, The Netherlands
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17
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Analysis of mice lacking the heparin-binding splice isoform of platelet-derived growth factor A. Mol Cell Biol 2013; 33:4030-40. [PMID: 23938297 DOI: 10.1128/mcb.00749-13] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Platelet-derived growth factor A-chain (PDGF-A) exists in two evolutionarily conserved isoforms, PDGF-Along and PDGF-Ashort, generated by alternative RNA splicing. They differ by the presence (in PDGF-Along) or absence (in PDGF-Ashort) of a carboxy-terminal heparin/heparan sulfate proteoglycan-binding motif. In mice, similar motifs present in other members of the PDGF and vascular endothelial growth factor (VEGF) families have been functionally analyzed in vivo, but the specific physiological importance of PDGF-Along has not been explored previously. Here, we analyzed the absolute and relative expression of the two PDGF-A splice isoforms during early postnatal organ development in the mouse and report on the generation of a Pdgfa allele (Pdgfa(Δex6)) incapable of producing PDGF-Along due to a deletion of the exon 6 splice acceptor site. In situations of limiting PDGF-A signaling through PDGF receptor alpha (PDGFRα), or in mice lacking PDGF-C, homozygous carriers of Pdgfa(Δex6) showed abnormal development of the lung, intestine, and vertebral column, pinpointing developmental processes where PDGF-Along may play a physiological role.
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18
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Abstract
The family of platelet-derived growth factors (PDGFs) plays a number of critical roles in normal embryonic development, cellular differentiation, and response to tissue damage. Not surprisingly, as it is a multi-faceted regulatory system, numerous pathological conditions are associated with aberrant activity of the PDGFs and their receptors. As we and others have shown, human gliomas, especially glioblastoma, express all PDGF ligands and both the two cell surface receptors, PDGFR-α and -β. The cellular distribution of these proteins in tumors indicates that glial tumor cells are stimulated via PDGF/PDGFR-α autocrine and paracrine loops, while tumor vessels are stimulated via the PDGFR-β. Here we summarize the initial discoveries on the role of PDGF and PDGF receptors in gliomas and provide a brief overview of what is known in this field.
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Affiliation(s)
- Inga Nazarenko
- Department of Oncology-Pathology, Karolinska Institutet, CCK R8:04, Karolinska University Hospital Solna, SE-17176 Stockholm, Sweden
| | - Sanna-Maria Hede
- Department of Oncology-Pathology, Karolinska Institutet, CCK R8:04, Karolinska University Hospital Solna, SE-17176 Stockholm, Sweden
- (currently) Uppsala University, Rudbeck Laboratory, Department of Immunology, Genetics and Pathology, SE-751 85 Uppsala, Sweden
| | - Xiaobing He
- Department of Oncology-Pathology, Karolinska Institutet, CCK R8:04, Karolinska University Hospital Solna, SE-17176 Stockholm, Sweden
| | - Anna Hedrén
- Department of Oncology-Pathology, Karolinska Institutet, CCK R8:04, Karolinska University Hospital Solna, SE-17176 Stockholm, Sweden
| | - James Thompson
- Department of Oncology-Pathology, Karolinska Institutet, CCK R8:04, Karolinska University Hospital Solna, SE-17176 Stockholm, Sweden
- Karolinska Healthcare Research Biobank (KHRBB), Clinical Pathology/Cytology, Karolinska University Hospital, SE-17176 Stockholm, Sweden
| | - Mikael S. Lindström
- Department of Oncology-Pathology, Karolinska Institutet, CCK R8:04, Karolinska University Hospital Solna, SE-17176 Stockholm, Sweden
| | - Monica Nistér
- Department of Oncology-Pathology, Karolinska Institutet, CCK R8:04, Karolinska University Hospital Solna, SE-17176 Stockholm, Sweden
- Karolinska Healthcare Research Biobank (KHRBB), Clinical Pathology/Cytology, Karolinska University Hospital, SE-17176 Stockholm, Sweden
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19
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Hou WH, Liua IH, Huang SS, Huang JS. CRSBP-1/LYVE-1 ligands stimulate contraction of the CRSBP-1-associated ER network in lymphatic endothelial cells. FEBS Lett 2012; 586:1480-7. [PMID: 22673514 DOI: 10.1016/j.febslet.2012.04.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2012] [Accepted: 04/03/2012] [Indexed: 11/17/2022]
Abstract
CRSBP-l/LYVE-1 ligands (PDGF-BB, VEGF-A(165) and hyaluronic acid) have been shown to induce opening of lymphatic intercellular junctions in vitro and in vivo by stimulating contraction of lymphatic endothelial cells (LECs). The mechanism by which CRSBP-1 ligands stimulate contraction of LECs is not understood. Here we demonstrate that CRSBP-1 is localized to the plasma membrane as well as intracellular fibrillar structures in LECs, including primary human dermal LECs and SVEC4-10 cells. CRSBP-1-associated fibrillar structures are identical to the ER network as evidenced by the co-localization of CRSBP-1 and BiP in these cells. CRSBP-1 ligands stimulate contraction of the ER network in a CRSBP-1-dependent and paclitaxel (a microtubule-stabilizing agent)-sensitive manner. These results suggest that ligand-stimulated ER contraction is associated with ligand-stimulated contraction in LECs.
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Affiliation(s)
- Wei-Hsien Hou
- Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, Doisy Research Center, St. Louis, MO 63104, United States
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20
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Armulik A, Genové G, Betsholtz C. Pericytes: developmental, physiological, and pathological perspectives, problems, and promises. Dev Cell 2011; 21:193-215. [PMID: 21839917 DOI: 10.1016/j.devcel.2011.07.001] [Citation(s) in RCA: 1823] [Impact Index Per Article: 140.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Pericytes, the mural cells of blood microvessels, have recently come into focus as regulators of vascular morphogenesis and function during development, cardiovascular homeostasis, and disease. Pericytes are implicated in the development of diabetic retinopathy and tissue fibrosis, and they are potential stromal targets for cancer therapy. Some pericytes are probably mesenchymal stem or progenitor cells, which give rise to adipocytes, cartilage, bone, and muscle. However, there is still confusion about the identity, ontogeny, and progeny of pericytes. Here, we review the history of these investigations, indicate emerging concepts, and point out problems and promise in the field of pericyte biology.
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Affiliation(s)
- Annika Armulik
- Division of Vascular Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institute, SE-171 77 Stockholm, Sweden
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21
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Hou WH, Liu IH, Tsai CC, Johnson FE, Huang SS, Huang JS. CRSBP-1/LYVE-1 ligands disrupt lymphatic intercellular adhesion by inducing tyrosine phosphorylation and internalization of VE-cadherin. J Cell Sci 2011; 124:1231-44. [PMID: 21444752 DOI: 10.1242/jcs.078154] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Cell-surface retention sequence (CRS) binding protein (CRSBP-1) is a membrane glycoprotein identified by its ability to bind PDGF-BB and VEGF-A via their CRS motifs (clusters of basic amino acid residues). CRSBP-1 is identical to LYVE-1 and exhibits dual ligand (CRS-containing proteins and hyaluronic acid) binding activity, suggesting the importance of CRSBP-1 ligands in lymphatic function. Here, we show that CRSBP-1 ligands induce disruption of VE-cadherin-mediated intercellular adhesion and opening of intercellular junctions in lymphatic endothelial cell (LEC) monolayers as determined by immunofluorescence microscopy and Transwell permeability assay. This occurs by interaction with CRSBP-1 in the CRSBP-1-PDGFβR-β-catenin complex, resulting in tyrosine phosphorylation of the complex, dissociation of β-catenin and p120-catenin from VE-cadherin, and internalization of VE-cadherin. Pretreatment of LECs with a PDGFβR kinase inhibitor abolishes ligand-stimulated tyrosine phosphorylation of VE-cadherin, halts the ligand-induced disruption of VE-cadherin intercellular adhesion and blocks the ligand-induced opening of intercellular junctions. These CRSBP-1 ligands also induce opening of lymphatic intercellular junctions that respond to PDGFβR kinase inhibitor in wild-type mice (but not in Crsbp1-null mice) as evidenced by increased transit of injected FITC-dextran and induced edema fluid from the interstitial space into lymphatic vessels. These results disclose a novel mechanism involved in the opening of lymphatic intercellular junctions.
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Affiliation(s)
- Wei-Hsien Hou
- Departments of Biochemistry and Molecular Biology, St Louis University School of Medicine, Doisy Research Center, 1100 S. Grand Boulevard, St Louis, MO 63104, USA
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22
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Raines SM, Richards OC, Schneider LR, Schueler KL, Rabaglia ME, Oler AT, Stapleton DS, Genové G, Dawson JA, Betsholtz C, Attie AD. Loss of PDGF-B activity increases hepatic vascular permeability and enhances insulin sensitivity. Am J Physiol Endocrinol Metab 2011; 301:E517-26. [PMID: 21673305 PMCID: PMC3174531 DOI: 10.1152/ajpendo.00241.2011] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Hepatic vasculature is not thought to pose a permeability barrier for diffusion of macromolecules from the bloodstream to hepatocytes. In contrast, in extrahepatic tissues, the microvasculature is critically important for insulin action, because transport of insulin across the endothelial cell layer is rate limiting for insulin-stimulated glucose disposal. However, very little is known concerning the role in this process of pericytes, the mural cells lining the basolateral membrane of endothelial cells. PDGF-B is a growth factor involved in the recruitment and function of pericytes. We studied insulin action in mice expressing PDGF-B lacking the proteoglycan binding domain, producing a protein with a partial loss of function (PDGF-B(ret/ret)). Insulin action was assessed through measurements of insulin signaling and insulin and glucose tolerance tests. PDGF-B deficiency enhanced hepatic vascular transendothelial transport. One outcome of this change was an increase in hepatic insulin signaling. This correlated with enhanced whole body glucose homeostasis and increased insulin clearance from the circulation during an insulin tolerance test. In obese mice, PDGF-B deficiency was associated with an 80% reduction in fasting insulin and drastically reduced insulin secretion. These mice did not have significantly higher glucose levels, reflecting a dramatic increase in insulin action. Our findings show that, despite already having a high permeability, hepatic transendothelial transport can be further enhanced. To the best of our knowledge, this is the first study to connect PDGF-B-induced changes in hepatic sinusoidal transport to changes in insulin action, demonstrating a link between PDGF-B signaling and insulin sensitivity.
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Brain abnormalities and glioma-like lesions in mice overexpressing the long isoform of PDGF-A in astrocytic cells. PLoS One 2011; 6:e18303. [PMID: 21490965 PMCID: PMC3072383 DOI: 10.1371/journal.pone.0018303] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2010] [Accepted: 03/02/2011] [Indexed: 11/19/2022] Open
Abstract
Background Deregulation of platelet-derived growth factor (PDGF) signaling is a hallmark of malignant glioma. Two alternatively spliced PDGF-A mRNAs have been described, corresponding to a long (L) and a short (S) isoform of PDGF-A. In contrast to PDGF-A(S), the PDGF-A(L) isoform has a lysine and arginine rich carboxy-terminal extension that acts as an extracellular matrix retention motif. However, the exact role of PDGF-A(L) and how it functionally differs from the shorter isoform is not well understood. Methodology/Principal Findings We overexpressed PDGF-A(L) as a transgene under control of the glial fibrillary acidic protein (GFAP) promoter in the mouse brain. This directs expression of the transgene to astrocytic cells and GFAP expressing neural stem cells throughout the developing and adult central nervous system. Transgenic mice exhibited a phenotype with enlarged skull at approximately 6-16 weeks of age and they died between 1.5 months and 2 years of age. We detected an increased number of undifferentiated cells in all areas of transgene expression, such as in the subependymal zone around the lateral ventricle and in the cerebellar medulla. The cells stained positive for Pdgfr-α, Olig2 and NG2 but this population did only partially overlap with cells positive for Gfap and the transgene reporter. Interestingly, a few mice presented with overt neoplastic glioma-like lesions composed of both Olig2 and Gfap positive cell populations and with microvascular proliferation, in a wild-type p53 background. Conclusions Our findings show that PDGF-A(L) can induce accumulation of immature cells in the mouse brain. The strong expression of NG2, Pdgfr-α and Olig2 in PDGF-A(L) brains suggests that a fraction of these cells are oligodendrocyte progenitors. In addition, accumulation of fluid in the subarachnoid space and skull enlargement indicate that an increased intracranial pressure contributed to the observed lethality.
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Ferrara N. Binding to the extracellular matrix and proteolytic processing: two key mechanisms regulating vascular endothelial growth factor action. Mol Biol Cell 2010; 21:687-90. [PMID: 20185770 PMCID: PMC2828956 DOI: 10.1091/mbc.e09-07-0590] [Citation(s) in RCA: 173] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Vascular endothelial growth factor (VEGF, VEGF-A) is a major regulator of physiological and pathological angiogenesis. One feature of VEGF is the existence of multiple isoforms arising from alternative exon splicing. Our initial biochemical and biological studies indicated that such isoforms are uniquely suited to generate angiogenic gradients by virtue of their differential ability to interact with the extracellular matrix (ECM). Although ECM-bound VEGF was bioactive, processing by physiologically relevant proteases such as plasmin was identified as a key mechanism to convert ECM-bound VEGF into freely diffusible forms. This retrospective article examines the early studies and also emphasizes the subsequent progress in our understanding of these processes in health and disease.
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25
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Richards OC, Raines SM, Attie AD. The role of blood vessels, endothelial cells, and vascular pericytes in insulin secretion and peripheral insulin action. Endocr Rev 2010; 31:343-63. [PMID: 20164242 PMCID: PMC3365844 DOI: 10.1210/er.2009-0035] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/01/2009] [Accepted: 12/17/2009] [Indexed: 02/08/2023]
Abstract
The pathogenesis of type 2 diabetes is intimately intertwined with the vasculature. Insulin must efficiently enter the bloodstream from pancreatic beta-cells, circulate throughout the body, and efficiently exit the bloodstream to reach target tissues and mediate its effects. Defects in the vasculature of pancreatic islets can lead to diabetic phenotypes. Similarly, insulin resistance is accompanied by defects in the vasculature of skeletal muscle, which ultimately reduce the ability of insulin and nutrients to reach myocytes. An underappreciated participant in these processes is the vascular pericyte. Pericytes, the smooth muscle-like cells lining the outsides of blood vessels throughout the body, have not been directly implicated in insulin secretion or peripheral insulin delivery. Here, we review the role of the vasculature in insulin secretion, islet function, and peripheral insulin delivery, and highlight a potential role for the vascular pericyte in these processes.
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Affiliation(s)
- Oliver C Richards
- Department of Biochemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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26
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Fuster MM, Wang L. Endothelial heparan sulfate in angiogenesis. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2010; 93:179-212. [PMID: 20807646 DOI: 10.1016/s1877-1173(10)93009-3] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Heparan sulfate (HS) is a linear polysaccharide composed of 50-200 glucosamine and uronic acid (glucuronic acid or iduronic acid) disaccharide repeats with epimerization and various sulfation modifications. HS is covalently attached to core proteins to form HS-proteoglycans. Most of the functions of HS-proteoglycans are mediated by their HS moieties. The biosynthesis of HS is initiated by chain polymerization and is followed by stepwise modification reactions, including sulfation and epimerization. These modifications generate ligand-binding sites that modulate cell functions and activities of proteinases and/or proteinase inhibitors. HS is abundantly expressed in developing and mature vasculature, and understanding its roles in vascular biology and related human diseases is an area of intense investigation. In this chapter, we summarize the significant recent advances in our understanding of the roles of HS in developmental and pathological angiogenesis with a major focus on studies using transgenic as well as gene knockout/knockdown models in mice and zebrafish. These studies have revealed that HS critically regulates angiogenesis by playing a proangiogenic role, and this regulatory function critically depends on HS fine structure. The latter is responsible for facilitating cell-surface binding of various proangiogenic growth factors that in turn mediate endothelial growth signaling. In cancer, mouse studies have revealed important roles for endothelial cell-surface HS as well as matrix-associated HS, wherein signaling by multiple growth factors as well as matrix storage of growth factors may be regulated by HS. We also discuss important mediators that may fine-tune such regulation, such as heparanase and sulfatases; and models wherein targeting HS (or core protein) biosynthesis may affect tumor growth and vascularization. Finally, the importance of targeting HS in other human diseases wherein angiogenesis may play pathophysiologic (or even therapeutic) roles is considered.
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Affiliation(s)
- Mark M Fuster
- Department of Medicine, Division of Pulmonary and Critical Care, University of California San Diego, La Jolla, California, USA
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Khachigian LM, Chesterman CN. Platelet-derived Growth Factor and its Receptor: Structure and Roles in Normal Growth and Pathology. Platelets 2009; 4:304-15. [DOI: 10.3109/09537109309013233] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Sundberg C, Friman T, Hecht LE, Kuhl C, Solomon KR. Two different PDGF beta-receptor cohorts in human pericytes mediate distinct biological endpoints. THE AMERICAN JOURNAL OF PATHOLOGY 2009; 175:171-89. [PMID: 19497991 DOI: 10.2353/ajpath.2009.080769] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
How activation of a specific growth factor receptor selectively results in either cell proliferation or cytoskeletal reorganization is of central importance to the field of pathophysiology. In this study, we report on a novel mechanism that explains how this process is accomplished. Our current investigation demonstrates that soluble platelet derived growth factor- (PDGF)-BB activates a cohort of PDGF-beta receptors primarily confined to the lipid raft component of the cell membrane, specifically caveolae. In contrast, cell-bound PDGF-BB delivered via cell-cell contact results in activation and the subsequent up-regulation of a cohort of PDGF beta-receptors primarily confined to the non-lipid raft component of the cell membrane. Individual activation of these two receptor cohorts results in distinct biological endpoints, cytoskeletal reorganization or cell proliferation. Mechanistically, our evidence suggests that PDGF-BB-bearing cells preferentially stimulate the non-lipid raft receptor cohort through interleukin 1beta-mediated inhibition of the lipid raft cohort of receptors, leaving the non-raft receptor cohort operational and preferentially stimulated. In human skin injected with PDGF-BB and in tissue reparative processes PDGF beta-receptors colocalize with the caveolae/lipid raft marker caveolin-1. In contrast, in human skin injected with PDGF-BB-bearing tumor cells and in colorectal adenocarcinoma, activated PDGF beta-receptors do not colocalize with caveolin-1. Thus, growth factor receptors are segregated into specific cell membrane compartments that are preferentially activated through different mechanisms of ligand delivery, resulting in distinct biological endpoints.
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Affiliation(s)
- Christian Sundberg
- Department of Orthopaedic Surgery, Children's' Hospital, Boston, Massachusetts 02115, USA
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29
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Gaengel K, Genové G, Armulik A, Betsholtz C. Endothelial-mural cell signaling in vascular development and angiogenesis. Arterioscler Thromb Vasc Biol 2009; 29:630-8. [PMID: 19164813 DOI: 10.1161/atvbaha.107.161521] [Citation(s) in RCA: 620] [Impact Index Per Article: 41.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Mural cells are essential components of blood vessels and are necessary for normal development, homeostasis, and organ function. Alterations in mural cell density or the stable attachment of mural cells to the endothelium is associated with several human diseases such as diabetic retinopathy, venous malformation, and hereditary stroke. In addition mural cells are implicated in regulating tumor growth and have thus been suggested as potential antiangiogenic targets in tumor therapy. In recent years our knowledge of mural cell function and endothelial-mural cell signaling has increased dramatically, and we now begin to understand the mechanistic basis of the key signaling pathways involved. This is mainly thanks to sophisticated in vivo experiments using a broad repertoire of genetic technologies. In this review, we summarize the five currently best understood signaling pathways implicated in mural cell biology. We discuss PDGFB/PDGFRbeta- dependent pericyte recruitment, as well as the role of angiopoietins and Tie receptors in vascular maturation. In addition, we highlight the effects of sphingosine-1-phosphate signaling on adherens junction assembly and vascular stability, as well as the role of TGF-beta-signaling in mural cell differentiation. We further reflect recent data suggesting an important function for Notch3 signaling in mural cell maturation.
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Affiliation(s)
- Konstantin Gaengel
- Vascular Biology Laboratory, Division of Matrix Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
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30
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The uPA/uPAR system regulates the bioavailability of PDGF-DD: implications for tumour growth. Oncogene 2008; 28:534-44. [DOI: 10.1038/onc.2008.410] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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31
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Ball SG, Shuttleworth CA, Kielty CM. Mesenchymal stem cells and neovascularization: role of platelet-derived growth factor receptors. J Cell Mol Med 2008; 11:1012-30. [PMID: 17979880 PMCID: PMC4401270 DOI: 10.1111/j.1582-4934.2007.00120.x] [Citation(s) in RCA: 130] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
There is now accumulating evidence that bone marrow-derived mesenchymal stem cells (MSCs) make an important contribution to postnatal vasculogenesis, especially during tissue ischaemia and tumour vascularization. Identifying mechanisms which regulate the role of MSCs in vasculogenesis is a key therapeutic objective, since while increased neovascularization can be advantageous during tissue ischaemia, it is deleterious during tumourigenesis. The potent angiogenic stimulant vascular endothelial growth factor (VEGF) is known to regulate MSC mobilization and recruitment to sites of neovascularization, as well as directing the differentiation of MSCs to a vascular cell fate. Despite the fact that MSCs did not express VEGF receptors, we have recently identified that VEGF-A can stimulate platelet-derived growth factor (PDGF) receptors, which regulates MSC migration and proliferation. This review focuses on the role of PDGF receptors in regulating the vascular cell fate of MSCs, with emphasis on the function of the novel VEGF-A/PDGF receptor signalling mechanism.
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Affiliation(s)
- Stephen G Ball
- UK Centre for Tissue Engineering, Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, The University of Manchester, Manchester, UK
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Fomchenko EI, Holland EC. Platelet-derived growth factor-mediated gliomagenesis and brain tumor recruitment. Neurosurg Clin N Am 2007; 18:39-58, viii. [PMID: 17244553 DOI: 10.1016/j.nec.2006.10.006] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Platelet-derived growth factor (PDGF) is a growth factor family of ligands and receptors known to activate phosphatidylinositol 3-kinase, mitogen-activated protein kinase, Jak family kinase, Src family kinase, and phospholipase Cgamma signal transduction pathways, some of which have been causally linked to glioma formation. Extensive involvement of PDGF in development and its implication in a variety of pathologic conditions, including gliomagenesis, are mediated not only by autocrine effects but by paracrine effects. Many researchers view brain tumors as clonal entities derived from the cancer stem cell; however, recent documentation of the importance of the tumor microenvironment for glioma initiation and progression as well as the ability of neural stem or progenitor cells to migrate toward the sites of injury or tumor formation reveals additional complexities in brain tumorigenesis. Paracrine effects of PDGF in animal models of gliomagenesis, continued adult neurogenesis capable of increasing in response to brain injury, and the growth factor-rich environment of brain tumors suggest that recruitment may play a role in gliomagenesis. In this view, glioma formation involves recruitment of cells from the adjacent brain and possibly other sites.
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Affiliation(s)
- Elena I Fomchenko
- Department of Cancer Biology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
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33
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Abramsson A, Kurup S, Busse M, Yamada S, Lindblom P, Schallmeiner E, Stenzel D, Sauvaget D, Ledin J, Ringvall M, Landegren U, Kjellén L, Bondjers G, Li JP, Lindahl U, Spillmann D, Betsholtz C, Gerhardt H. Defective N-sulfation of heparan sulfate proteoglycans limits PDGF-BB binding and pericyte recruitment in vascular development. Genes Dev 2007; 21:316-31. [PMID: 17289920 PMCID: PMC1785125 DOI: 10.1101/gad.398207] [Citation(s) in RCA: 144] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
During vascular development, endothelial platelet-derived growth factor B (PDGF-B) is critical for pericyte recruitment. Deletion of the conserved C-terminal heparin-binding motif impairs PDGF-BB retention and pericyte recruitment in vivo, suggesting a potential role for heparan sulfate (HS) in PDGF-BB function during vascular development. We studied the participation of HS chains in pericyte recruitment using two mouse models with altered HS biosynthesis. Reduction of N-sulfation due to deficiency in N-deacetylase/N-sulfotransferase-1 attenuated PDGF-BB binding in vitro, and led to pericyte detachment and delayed pericyte migration in vivo. Reduced N-sulfation also impaired PDGF-BB signaling and directed cell migration, but not proliferation. In contrast, HS from glucuronyl C5-epimerase mutants, which is extensively N- and 6-O-sulfated, but lacks 2-O-sulfated L-iduronic acid residues, retained PDGF-BB in vitro, and pericyte recruitment in vivo was only transiently delayed. These observations were supported by in vitro characterization of the structural features in HS important for PDGF-BB binding. We conclude that pericyte recruitment requires HS with sufficiently extended and appropriately spaced N-sulfated domains to retain PDGF-BB and activate PDGF receptor beta (PDGFRbeta) signaling, whereas the detailed sequence of monosaccharide and sulfate residues does not appear to be important for this interaction.
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Affiliation(s)
- Alexandra Abramsson
- Department of Medical Biochemistry and Biophysics, Division of Matrix Biology, Karolinska Institute, SE-171 77 Stockholm, Sweden
| | - Sindhulakshmi Kurup
- Department of Medical Biochemistry and Microbiology, University of Uppsala, SE-751 23 Uppsala, Sweden
| | - Marta Busse
- Vascular Biology Laboratory, Cancer Research UK, Lincoln’s Inn Fields Laboratories, London WC 2A 3PX, United Kingdom
| | - Shuhei Yamada
- Department of Medical Biochemistry and Microbiology, University of Uppsala, SE-751 23 Uppsala, Sweden
| | - Per Lindblom
- Vascular Biology Laboratory, Cancer Research UK, Lincoln’s Inn Fields Laboratories, London WC 2A 3PX, United Kingdom
| | - Edith Schallmeiner
- Department of Genetics and Pathology, Rudbeck Laboratory, SE-751 85 Uppsala, Sweden
| | - Denise Stenzel
- Vascular Biology Laboratory, Cancer Research UK, Lincoln’s Inn Fields Laboratories, London WC 2A 3PX, United Kingdom
| | - Dominique Sauvaget
- Vascular Biology Laboratory, Cancer Research UK, Lincoln’s Inn Fields Laboratories, London WC 2A 3PX, United Kingdom
| | - Johan Ledin
- Department of Medical Biochemistry and Microbiology, University of Uppsala, SE-751 23 Uppsala, Sweden
| | - Maria Ringvall
- Department of Medical Biochemistry and Microbiology, University of Uppsala, SE-751 23 Uppsala, Sweden
| | - Ulf Landegren
- Department of Genetics and Pathology, Rudbeck Laboratory, SE-751 85 Uppsala, Sweden
| | - Lena Kjellén
- Department of Medical Biochemistry and Microbiology, University of Uppsala, SE-751 23 Uppsala, Sweden
| | - Göran Bondjers
- Wallenberg Laboratory for Cardiovascular Research, Sahlgrenska Academy, Göteborg University, SE-413 45 Gothenburg, Sweden
| | - Jin-ping Li
- Department of Medical Biochemistry and Microbiology, University of Uppsala, SE-751 23 Uppsala, Sweden
| | - Ulf Lindahl
- Department of Medical Biochemistry and Microbiology, University of Uppsala, SE-751 23 Uppsala, Sweden
| | - Dorothe Spillmann
- Department of Medical Biochemistry and Microbiology, University of Uppsala, SE-751 23 Uppsala, Sweden
| | - Christer Betsholtz
- Department of Medical Biochemistry and Biophysics, Division of Matrix Biology, Karolinska Institute, SE-171 77 Stockholm, Sweden
| | - Holger Gerhardt
- Vascular Biology Laboratory, Cancer Research UK, Lincoln’s Inn Fields Laboratories, London WC 2A 3PX, United Kingdom
- Corresponding author.E-MAIL ; FAX 44-207-269-3417
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Huang SS, Liu IH, Smith T, Shah MR, Johnson FE, Huang JS. CRSBP-1/LYVE-l-null mice exhibit identifiable morphological and functional alterations of lymphatic capillary vessels. FEBS Lett 2006; 580:6259-68. [PMID: 17070806 PMCID: PMC3125019 DOI: 10.1016/j.febslet.2006.10.028] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2006] [Revised: 10/09/2006] [Accepted: 10/12/2006] [Indexed: 11/22/2022]
Abstract
CRSBP-1, a membrane glycoprotein, can mediate cell-surface retention of secreted growth factors containing CRS motifs such as PDGF-BB. CRSBP-1 has recently been found to be identical to LYVE-1, a specific marker for lymphatic capillary endothelial cells. The in vivo role of CRSBP-1/LYVE-1 is unknown. CRSBP-1-null mice are overtly normal and fertile but exhibit identifiable morphological and functional alterations of lymphatic capillary vessels in certain tissues, marked by the constitutively increased interstitial-lymphatic flow and lack of typical irregularly-shaped lumens. The CRSBP-1 ligands PDGF-BB and HA enhance interstitial-lymphatic flow in wild-type mice but not in CRSBP-1-null animals.
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Affiliation(s)
- Shuan S. Huang
- Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, St. Louis, MO
- To whom correspondence should be addressed: Jung San Huang, Ph.D., Professor, Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, 1402 South Grand Boulevard, St. Louis, MO 63104, Phone: (314) 977-9250, Fax: (314) 977-9205,
| | - I-Hua Liu
- Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, St. Louis, MO
| | - Tracy Smith
- Department of Comparative medicine, Saint Louis University School of Medicine, St. Louis, MO
| | - Maulik R. Shah
- Department of Pediatrics, Saint Louis University School of Medicine, St. Louis, MO
| | - Frank E. Johnson
- Department of Surgery, Saint Louis University School of Medicine, St. Louis, MO
| | - Jung S. Huang
- Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, St. Louis, MO
- To whom correspondence should be addressed: Jung San Huang, Ph.D., Professor, Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, 1402 South Grand Boulevard, St. Louis, MO 63104, Phone: (314) 977-9250, Fax: (314) 977-9205,
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Reigstad LJ, Varhaug JE, Lillehaug JR. Structural and functional specificities of PDGF-C and PDGF-D, the novel members of the platelet-derived growth factors family. FEBS J 2005; 272:5723-41. [PMID: 16279938 DOI: 10.1111/j.1742-4658.2005.04989.x] [Citation(s) in RCA: 152] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The platelet-derived growth factor (PDGF) family was for more than 25 years assumed to consist of only PDGF-A and -B. The discovery of the novel family members PDGF-C and PDGF-D triggered a search for novel activities and complementary fine tuning between the members of this family of growth factors. Since the expansion of the PDGF family, more than 60 publications on the novel PDGF-C and PDGF-D have been presented, highlighting similarities and differences to the classical PDGFs. In this paper we review the published data on the PDGF family covering structural (gene and protein) similarities and differences among all four family members, with special focus on PDGF-C and PDGF-D expression and functions. Little information on the protein structures of PDGF-C and -D is currently available, but the PDGF-C protein may be structurally more similar to VEGF-A than to PDGF-B. PDGF-C contributes to normal development of the heart, ear, central nervous system (CNS), and kidney, while PDGF-D is active in the development of the kidney, eye and brain. In adults, PDGF-C is active in the kidney and the central nervous system. PDGF-D also plays a role in the lung and in periodontal mineralization. PDGF-C is expressed in Ewing family sarcoma and PDGF-D is linked to lung, prostate and ovarian cancers. Both PDGF-C and -D play a role in progressive renal disease, glioblastoma/medulloblastoma and fibrosis in several organs.
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MESH Headings
- Alternative Splicing
- Amino Acid Motifs
- Amino Acid Sequence
- Animals
- Codon, Initiator
- Codon, Terminator
- Cysteine/chemistry
- Dimerization
- Disulfides/chemistry
- Exons
- Humans
- Introns
- Lymphokines/chemistry
- Lymphokines/genetics
- Lymphokines/physiology
- Mice
- Mice, Knockout
- Models, Molecular
- Molecular Sequence Data
- Platelet-Derived Growth Factor/chemistry
- Platelet-Derived Growth Factor/genetics
- Platelet-Derived Growth Factor/physiology
- Promoter Regions, Genetic
- Protein Binding
- Protein Processing, Post-Translational
- Protein Sorting Signals
- Protein Structure, Secondary
- Protein Structure, Tertiary
- Receptors, Platelet-Derived Growth Factor/genetics
- Receptors, Platelet-Derived Growth Factor/metabolism
- Sequence Homology, Amino Acid
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Betsholtz C, Lindblom P, Gerhardt H. Role of pericytes in vascular morphogenesis. EXS 2005:115-25. [PMID: 15617474 DOI: 10.1007/3-7643-7311-3_8] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Pericytes are solitary, smooth muscle-like mural cells that invest the wall of microvessels. For a long time, the functional significance of the presence and distribution of pericytes in the microvasculature was unclear. However, in recent years, the application of experimental genetics to the PDGF-B/PDGFRbeta signaling pathway in mice has provided a range of mutants with primary defects in pericytes, allowing for studies of the physiological consequences of pericyte deficiency in developmental angiogenesis and adult physiology. Interestingly, some of the phenotypic consequences of these mutations resemble human diseases, such as diabetic retinopathy. The studies have also led to the discovery of critical mechanisms involved in pericyte recruitment and differentiation. The present review focuses on genetic data suggesting that pericytes take active part in developmental angiogenic processes.
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Affiliation(s)
- Christer Betsholtz
- Laboratory of Vascular Biology, Division of Matrix Biology, House A3, Plan 4, Department of Medical Biochemistry and Biophysics, Scheels vag 2, Karolinska Institutet, 17177 Stockholm, Sweden.
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Fredriksson L, Li H, Eriksson U. The PDGF family: four gene products form five dimeric isoforms. Cytokine Growth Factor Rev 2005; 15:197-204. [PMID: 15207811 DOI: 10.1016/j.cytogfr.2004.03.007] [Citation(s) in RCA: 526] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Platelet-derived growth factors (PDGFs) were discovered more than two decades ago. Today the PDGF family of growth factors consists of five different disulphide-linked dimers built up of four different polypeptide chains encoded by four different genes. These isoforms, PDGF-AA, PDGF-AB, PDGF-BB, PDGF-CC and PDGF-DD, act via two receptor tyrosine kinases, PDGF receptors alpha and beta. The classic PDGFs, PDGF-A and PDGF-B, undergo intracellular activation during transport in the exocytic pathway for subsequent secretion, while the novel PDGFs, PDGF-C and PDGF-D, are secreted as latent factors that require activation by extracellular proteases. The classical PDGF polypeptide chains, PDGF-A and PDGF-B, are well studied and they regulate several physiological and pathophysiological processes, mainly using cells of mesenchymal or neuroectodermal origin as their targets. The discovery of two additional ligands for the two PDGF receptors suggests that PDGF-mediated cellular signaling is more complex than previously thought.
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Affiliation(s)
- Linda Fredriksson
- Ludwig Institute for Cancer Research, Stockholm Branch, Box 240, S-171 77 Stockholm, Sweden
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Betsholtz C. Insight into the physiological functions of PDGF through genetic studies in mice. Cytokine Growth Factor Rev 2005; 15:215-28. [PMID: 15207813 DOI: 10.1016/j.cytogfr.2004.03.005] [Citation(s) in RCA: 265] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Genetic analyses in mice have contributed significantly to the understanding of the physiological functions of platelet-derived growth factors (PDGFs) and their receptors. Phenotypic analyses of gene knockouts of PDGF-A, PDGF-B, PDGF alpha-receptors (PDGFRalpha) and beta-receptors (PDGFRbeta) have shown that these ligands and receptors play major roles during embryonic development. Conditional and subtle mutations in the same genes and analysis of chimeric mice have provided additional information about the roles of these genes in postnatal development. Transgenic over-expression studies have also demonstrated that PDGF ligands are capable of inducing pathological cell proliferation in a number of different organs. The present review summarizes these findings and discusses their implications for mammalian development and disease.
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Affiliation(s)
- Christer Betsholtz
- Department of Medical Biochemistry, University of Göteborg, P.O. Box 440, SE 405 30 Göteborg, Sweden.
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Sutajová M, Neukirchen U, Meinecke P, Czeizel AE, Tímár L, Sólyom E, Gal A, Kutsche K. Disruption of the PDGFB gene in a 1;22 translocation patient does not cause Costello syndrome. Genomics 2004; 83:883-92. [PMID: 15081117 DOI: 10.1016/j.ygeno.2003.10.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2003] [Accepted: 10/30/2003] [Indexed: 10/26/2022]
Abstract
We studied a female patient initially diagnosed with Costello syndrome who carries an apparently balanced translocation, t(1;22) (q24.3;q13.1). Molecular characterization of the translocation revealed a mosaic of two derivative chromosomes 1 in her peripheral blood lymphocytes, in one of which the coding region of the platelet-derived growth factor (PDGFB; chromosome 22q13.1) gene was disrupted. Both the initial translocation and the secondary intrachromosomal rearrangement appear to have occurred by nonhomologous (illegitimate) recombination. In 18 patients with Costello syndrome, mutation analysis of the genes belonging to the PDGF/R family, PDGFA, PDGFB, PDGFC, PDGFD, PDGFRA, and PDGFRB, revealed no pathogenic mutations. Reevaluation of the clinical symptoms of the translocation patient challenges the diagnosis of Costello syndrome in this patient. In total RNA isolated from lymphocytes of the translocation patient, we identified four different fusion transcripts consisting of PDGFB exons and parts of chromosome 1q24.3. In two of the mRNAs, exon 6 of PDGFB, encoding the 41 C-terminal amino acid residues, was absent. Immunofluorescence analysis showed that the wild-type protein was dispersed and formed a network-like structure in the extracellular matrix, whereas the two aberrant PDGFB proteins were localized in aggregates. We speculate that the biological consequences of the mutant PDGFB allele contributed to the unique disease phenotype of the translocation patient.
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MESH Headings
- Abnormalities, Multiple/genetics
- Animals
- COS Cells
- Child
- Chromosome Breakage/genetics
- Chromosomes, Human, Pair 1/genetics
- Chromosomes, Human, Pair 22/genetics
- DNA Mutational Analysis
- Exons/genetics
- Extracellular Matrix/metabolism
- Female
- Genes, sis/genetics
- Humans
- Male
- Phenotype
- Platelet-Derived Growth Factor/chemistry
- Platelet-Derived Growth Factor/genetics
- Platelet-Derived Growth Factor/metabolism
- Polymorphism, Genetic/genetics
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Syndrome
- Translocation, Genetic/genetics
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Affiliation(s)
- Markéta Sutajová
- Institut für Humangenetik, Universitätsklinikum Hamburg-Eppendorf, Butenfeld 42, 22529 Hamburg, Germany
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40
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Betsholtz C. Biology of platelet-derived growth factors in development. ACTA ACUST UNITED AC 2004; 69:272-85. [PMID: 14745969 DOI: 10.1002/bdrc.10030] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Platelet-derived growth factor (PDGF) was one of the first growth factors to be characterized, and the PDGF family of ligand and receptors has remained an archetype system for studies of the mechanisms of action of growth factors and receptor tyrosine kinases for more than two decades. The small size of the family has also facilitated genetic studies and, in particular, manipulations of the mouse PDGF and PDGF receptor genes have given important insights into the role of this family during mammalian development. These studies have shown that discrete populations of mesenchymal and neuroectodermal progenitor cells depend on PDGF signaling for their growth and distribution within developing organs. Other studies suggest that the same, or similar, cells may be targeted by exaggerated PDGF signaling in a number of pathological processes, including different types of cancer. The present review summarizes current views on the roles of PDGFs in developmental processes, and discusses the critical importance of the amount, spatial distribution, and bioavailability of the PDGF proteins for acquisition of the correct number and location of target cells.
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Huang SS, Tang FM, Huang YH, Liu IH, Hsu SC, Chen ST, Huang JS. Cloning, expression, characterization, and role in autocrine cell growth of cell surface retention sequence binding protein-1. J Biol Chem 2003; 278:43855-69. [PMID: 12912978 DOI: 10.1074/jbc.m306411200] [Citation(s) in RCA: 16] [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
Cell surface retention sequence binding protein-1 (CRSBP-1) is a cell surface binding protein for the cell surface retention sequence (CRS) motif of the v-sis gene product (platelet-derived growth factor-BB). It has been shown to be responsible for cell surface retention of the v-sis gene product in v-sis-transformed cells (fibroblasts) and has been hypothesized to play a role in autocrine growth and transformation of these cells. Here we demonstrate that the CRSBP-1 cDNA cloned from bovine liver libraries encodes a 322-residue type I membrane protein containing a 23-residue signal peptide, a 215-residue cell surface domain, a 21-residue transmembrane domain, and a 63-residue cytoplasmic domain. CRSBP-1 expressed in transfected cells is an approximately 120-kDa disulfide-linked homodimeric glycoprotein and exhibits dual ligand (CRS-containing growth regulators (v-sis gene product and insulin-like growth factor binding protein-3, IGFBP-3) and hyaluronic acid) binding activity. CRSBP-1 overexpression (by stable transfection of cells with CRSBP-1 cDNA) enhances autocrine loop signaling, cell growth, and tumorigenicity (in mice) of v-sis-transformed cells. CRSBP-1 expression also enhances autocrine cell growth mediated by IGFBP-3 in human lung carcinoma cells (H1299 cells), which express very little, if any, endogenous CRSBP-1 and exhibits a mitogenic response to exogenous IGFBP-3, stably transfected with IGFBP-3 cDNA. However, CRSBP-1 overexpression does not affect growth of normal and transformed cells that do not produce these CRS-containing growth regulators. These results suggest that CRSBP-1 plays a role in autocrine regulation of cell growth mediated by growth regulators containing CRS.
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Affiliation(s)
- Shuan Shian Huang
- Departments of Biochemistry and Molecular Biology, St. Louis University School of Medicine, St. Louis, Missouri 63104, USA.
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Abramsson A, Lindblom P, Betsholtz C. Endothelial and nonendothelial sources of PDGF-B regulate pericyte recruitment and influence vascular pattern formation in tumors. J Clin Invest 2003. [DOI: 10.1172/jci200318549] [Citation(s) in RCA: 374] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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García-Olivas R, Hoebeke J, Castel S, Reina M, Fager G, Lustig F, Vilaró S. Differential binding of platelet-derived growth factor isoforms to glycosaminoglycans. Histochem Cell Biol 2003; 120:371-82. [PMID: 14557886 DOI: 10.1007/s00418-003-0576-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/02/2003] [Indexed: 10/26/2022]
Abstract
The platelet-derived growth factor (PDGF) family comprises disulfide-bonded dimeric isoforms and plays a key role in the proliferation and migration of mesenchymal cells. Traditionally, it consists of homo- and heterodimers of A and B polypeptide chains that occur as long (A(L) and B(L)) or short (A(S) and B(S)) isoforms. Short isoforms lack the basic C-terminal extension that mediates binding to heparin. In the present study, we show that certain PDGF isoforms bind in a specific manner to glycosaminoglycans (GAGs). Experiments performed with wild-type and mutant Chinese hamster ovary cells deficient in the synthesis of GAGs revealed that PDGF long isoforms bind to heparan sulfate and chondroitin sulfate, while PDGF short isoforms only bind to heparan sulfate. This was confirmed by digestion of cell surface GAGs with heparitinase and chondroitinase ABC and by incubation with sodium chloride to prevent GAG sulfation. Furthermore, exogenous GAGs inhibited the binding of long isoforms to the cell membrane more efficiently than that of short isoforms. Additionally, we performed surface plasmon resonance experiments to study the inhibition of PDGF isoforms binding to low molecular weight heparin by GAGs. These experiments showed that PDGF-AA(L) and PDGF-BB(S) isoforms bound to GAGs with the highest affinity. In conclusion, PDGF activity at the cell surface may depend on the expression of various cellular GAG species.
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Affiliation(s)
- Raquel García-Olivas
- Department of Cellular Biology, Faculty of Biology, University of Barcelona, Avenida Diagonal 645, 08028, Barcelona, Spain
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Abramsson A, Lindblom P, Betsholtz C. Endothelial and nonendothelial sources of PDGF-B regulate pericyte recruitment and influence vascular pattern formation in tumors. J Clin Invest 2003; 112:1142-51. [PMID: 14561699 PMCID: PMC213487 DOI: 10.1172/jci18549] [Citation(s) in RCA: 212] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2003] [Accepted: 09/16/2003] [Indexed: 11/17/2022] Open
Abstract
Tumor-infiltrating blood vessels deviate morphologically and biochemically from normal vessels, raising the prospect of selective pharmacological targeting. Current antiangiogenic approaches focus mainly on endothelial cells, but recent data imply that targeting pericytes may provide additional benefits. Further development of these concepts will require deeper insight into mechanisms of pericyte recruitment and function in tumors. Here, we applied genetic tools to decipher the function of PDGF-B and PDGF-Rbeta in pericyte recruitment in a mouse fibrosarcoma model. In tumors transplanted into PDGF-B retention motif-deficient (pdgf-b(ret/ret)) mice, pericytes were fewer and were partially detached from the vessel wall, coinciding with increased tumor vessel diameter and hemorrhaging. Transgenic PDGF-B expression in tumor cells was able to increase the pericyte density in both WT and pdgf-b(ret/ret) mice but failed to correct the pericyte detachment in pdgf-b(ret/ret) mice. Coinjection of exogenous pericytes and tumor cells showed that pericytes require PDGF-Rbeta for recruitment to tumor vessels, whereas endothelial PDGF-B retention is indispensable for proper integration of pericytes in the vessel wall. Our data support the notion that pericytes serve an important function in tumor vessels and highlight PDGF-B and PDGF-Rbeta as promising molecular targets for therapeutic intervention.
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Affiliation(s)
- Alexandra Abramsson
- Department of Medical Biochemistry, Sahlgrenska Academy at Göteberg University, Göteborg, Sweden
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Lindblom P, Gerhardt H, Liebner S, Abramsson A, Enge M, Hellstrom M, Backstrom G, Fredriksson S, Landegren U, Nystrom HC, Bergstrom G, Dejana E, Ostman A, Lindahl P, Betsholtz C. Endothelial PDGF-B retention is required for proper investment of pericytes in the microvessel wall. Genes Dev 2003; 17:1835-40. [PMID: 12897053 PMCID: PMC196228 DOI: 10.1101/gad.266803] [Citation(s) in RCA: 466] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Several platelet-derived growth factor (PDGF) and vascular endothelial growth factor (VEGF) family members display C-terminal protein motifs that confer retention of the secreted factors within the pericellular space. To address the role of PDGF-B retention in vivo, we deleted the retention motif by gene targeting in mice. This resulted in defective investment of pericytes in the microvessel wall and delayed formation of the renal glomerulus mesangium. Long-term effects of lack of PDGF-B retention included severe retinal deterioration, glomerulosclerosis, and proteinuria. We conclude that retention of PDGF-B in microvessels is essential for proper recruitment and organization of pericytes and for renal and retinal function in adult mice.
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Affiliation(s)
- Per Lindblom
- Department of Medical Biochemistry, Göteborg University, Göteborg SE-405 30, Sweden
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Rolny C, Spillmann D, Lindahl U, Claesson-Welsh L. Heparin amplifies platelet-derived growth factor (PDGF)- BB-induced PDGF alpha -receptor but not PDGF beta -receptor tyrosine phosphorylation in heparan sulfate-deficient cells. Effects on signal transduction and biological responses. J Biol Chem 2002; 277:19315-21. [PMID: 11912193 DOI: 10.1074/jbc.m111805200] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Platelet-derived growth factor (PDGF) induces mitogenic and migratory responses in a wide variety of cells, by activating specific receptor tyrosine kinases denoted the PDGF alpha- and beta-receptors. Different PDGF isoforms bind in a distinct manner to glycosaminoglycans, particularly heparan sulfate. In the present study, we show potentiation by exogenous heparin of PDGF-BB-induced PDGF alpha-receptor tyrosine phosphorylation in heparan sulfate-deficient Chinese hamster ovary (CHO) 677 cells. This effect was not seen for PDGF-AA treatment, and heparin lacked a potentiating effect on PDGF-BB stimulation of the PDGF beta-receptor. Heparin did not affect the affinity of PDGF-BB binding for the PDGF receptors on CHO 677 cells. The PDGF-BB-stimulated PDGF alpha-receptor phosphorylation was enhanced in a dose-dependent fashion by heparin at low concentration. The effect was modulated by 2-O- and 6-O-desulfation of the polysaccharide. Maximal induction of PDGF alpha-receptor tyrosine phosphorylation (6-fold) in CHO 677 cells was achieved by treatment with a heparin decasaccharide, but shorter oligosaccharides consisting of four or more monosaccharide units were also able to augment PDGF alpha-receptor phosphorylation, albeit at higher concentrations. Heparin potentiated PDGF-BB-induced activation of mitogen-activated protein kinase and protein kinase B (Akt) and allowed increased chemotaxis of the CHO 677 cells toward PDGF-BB. In conclusion, heparin modulates PDGF-BB-induced PDGF alpha-receptor phosphorylation and downstream signaling, with consequences for cellular responsiveness to the growth factor.
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Affiliation(s)
- Charlotte Rolny
- Department of Genetics and Pathology, Uppsala University, Rudbeck Laboratory, Dag Hammarskjölds v. 20, 751 85 Uppsala, Sweden
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Baron R, Silverman ES, Grasemann H, Collins T, Drazen JM. DNA sequence variants of the platelet-derived growth factor A-chain gene. Clin Exp Allergy 2001; 31:1501-8. [PMID: 11678848 DOI: 10.1046/j.1365-2222.2001.01197.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Platelet-derived growth factor A-chain (PDGF-A) is a potent connective tissue mitogen implicated in lung growth and development. PDGF-A may have a role in asthma through effects on fibroblasts and bronchial smooth muscle cells. OBJECTIVE To test the hypothesis that there exist variations in the PDGF-A gene associated with the asthma phenotype. METHODS We screened genomic DNA from normal and asthmatic subjects using single-stranded conformational polymorphism (SSCP) for mutations in the promoter and all seven exons of the gene. RESULTS Four transition polymorphisms (three novel) were identified: one each in exons 3 and 4 (overall population allele frequencies 0.18 and 0.02, respectively) which did not alter the protein sequence, one in exon 4 (frequency 0.005) which resulted in a valine to isoleucine substitution, and one in intron 5 (frequency 0.5). The intron 5-sequence variant is close to the 3' end of exon 5 but does not appear to affect alternative splicing of PDGF-A exon 6 RNA. The frequencies of the polymorphisms in exons 3 and intron 5 did not differ between the asthmatic and non-asthmatic subjects, but there was a significant frequency difference between Caucasian and African-American subjects for each of these polymorphisms (P = 0.03 and 0.003, respectively). CONCLUSION No association was found between the sequence variants in the PDGF-A gene and the development of asthma. However, the allele frequency of some of the sequence variants differed between the Caucasian and African-American subjects.
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Affiliation(s)
- R Baron
- Pulmonary and Critical Care Division, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA
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Nguyen TV, Fujioka H, Kang AS, Rogers WO, Fidock DA, James AA. Stage-dependent localization of a novel gene product of the malaria parasite, Plasmodium falciparum. J Biol Chem 2001; 276:26724-31. [PMID: 11371568 DOI: 10.1074/jbc.m103375200] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
A novel Plasmodium falciparum gene, MB2, was identified by screening a sporozoite cDNA library with the serum of a human volunteer protected experimentally by the bites of P. falciparum-infected and irradiated mosquitoes. The single-exon, single-copy MB2 gene is predicted to encode a protein with an M(r) of 187,000. The MB2 protein has an amino-terminal basic domain, a central acidic domain, and a carboxyl-terminal domain with similarity to the GTP-binding domain of the prokaryotic translation initiation factor 2. MB2 is expressed in sporozoites, the liver, and blood-stage parasites and gametocytes. The MB2 protein is distributed as a approximately 120-kDa moiety on the surface of sporozoites and is imported into the nucleus of blood-stage parasites as a approximately 66-kDa species. Proteolytic processing is favored as the mechanism regulating the distinct subcellular localization of the MB2 protein. This differential localization provides multiple opportunities to exploit the MB2 gene product as a vaccine or therapeutic target.
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Affiliation(s)
- T V Nguyen
- Department of Molecular Biology and Biochemistry, University of California, Irvine, California 92697, USA
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Chiang SC, Ali V, Huang AL, Chu KY, Tone Lee S. Molecular, cellular and functional characterizations of a novel ICAM-like molecule of the immunoglobulin superfamily from Leishmania mexicana amazonensis. Mol Biochem Parasitol 2001; 112:263-75. [PMID: 11223133 DOI: 10.1016/s0166-6851(00)00374-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A molecule with two immunoglobulin (Ig) domains cloned from Leishmania mexicana amazonensis was characterized to have a sequence homology to the Ig domains of an ICAM-like molecule telencephalin, cloned from the brain of mammals, as well as to the variable domains of human immunoglobulin lambda light chain. The molecule therefore appears to be an ICAM-like molecule as well as a member of the immunoglobulin superfamily. We thus named it ICAM-L for Leishmania ICAM. The gene was coamplified with the ribonucleotide reductase M(2) subunit gene responsible for hydroxyurea resistance from hydroxyurea (Hu)-resistant Leishmania variants. As expected, an increase of the ICAM-L protein as well as an increase of the specific ICAM-L transcript of 2.1 kb was detected in the Hu-resistant variants with increasing doses of the drug used for resistance selection. Structurally, ICAM-L is more similar to the secretory adhesive molecules, such as 1Bgp and the link protein of the immunoglobulin superfamily, in that it lacks a transmembrane region and a GPI anchor sequence. Although ICAM-L was mainly localized in the nucleus of the parasite by confocal microscopy, however, detailed studies by electron microscopy and FACS analysis indicated that the protein was also localized on the surface of the parasite. The surface localization of the protein was furthered strengthened by the observations that anti-ICAM-L or ICAM-L itself can significantly block the binding of the parasite to macrophages. The blocking of the attachment of parasite to macrophages may indicate that ICAM-L functions as an intercellular adhesive molecule.
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Affiliation(s)
- S C Chiang
- Division of Infectious Diseases, Institute of Biomedical Sciences, Academia Sinica, 11529 Taipei, Taiwan, ROC
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Tyrone JW, Mogford JE, Chandler LA, Ma C, Xia Y, Pierce GF, Mustoe TA. Collagen-embedded platelet-derived growth factor DNA plasmid promotes wound healing in a dermal ulcer model. J Surg Res 2000; 93:230-6. [PMID: 11027465 DOI: 10.1006/jsre.2000.5912] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
BACKGROUND Gene therapy has shown limited efficacy for treating congenital diseases, partly due to temporary gene expression and host immune responses. Such results suggest that gene therapy is ideal for chronic wound treatment where limited duration of target gene expression is required. This study tested the wound healing effects of topically applied platelet-derived growth factor (PDGF)-A or -B chain DNA plasmids embedded within a collagen lattice. MATERIALS AND METHODS Four 6-mm dermal ulcer wounds were created in the ears of young adult New Zealand White rabbits made ischemic by division of the central and rostral arteries. Wounds were treated with lyophilized collagen containing PDGF-B DNA (1.0-3.0 mg), PDGF-A DNA (1.0 mg), irrelevant DNA (1.0 mg), or collagen alone. Wounds were dressed and harvested after 10 days for measurement of granulation tissue formation, epithelialization, and wound closure. Results were evaluated with a paired two-tailed Student t test, with P values < 0.05 considered significant. RESULTS PDGF-B DNA increased new granulation tissue (NGT) formation up to 52% and epithelialization 34% compared with controls. Wound closure was increased up to threefold. At 1.0 mg DNA, PDGF-A and PDGF-B stimulated similar responses. No difference in NGT or epithelialization was seen between control groups. CONCLUSIONS PDGF DNA gene therapy is effective at accelerating wound healing in ischemic dermal ulcers and provides a viable alternative to peptide growth factor therapy.
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Affiliation(s)
- J W Tyrone
- Division of Plastic and Reconstructive Surgery, Northwestern University, Ward Building, 19th Floor, 303 East Chicago Avenue, Chicago, Illinois 60611, USA
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