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Zhou S, Chen S, Pei YA, Pei M. Nidogen: A matrix protein with potential roles in musculoskeletal tissue regeneration. Genes Dis 2022; 9:598-609. [PMID: 35782975 PMCID: PMC9243345 DOI: 10.1016/j.gendis.2021.03.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 03/03/2021] [Accepted: 03/24/2021] [Indexed: 12/14/2022] Open
Abstract
Basement membrane proteins are known to guide cell structures, differentiation, and tissue repair. Although there is a wealth of knowledge on the functions of laminins, perlecan, and type IV collagen in maintaining tissue homeostasis, not much is known about nidogen. As a key molecule in the basement membrane, nidogen contributes to the formation of a delicate microenvironment that proves necessary for stem cell lineage-specific differentiation. In this review, the expression of nidogen is delineated at both cellular and tissue levels from embryonic to adult stages of development; the effect of nidogens is also summarized in the context of musculoskeletal development and regeneration, including but not limited to adipogenesis, angiogenesis, chondrogenesis, myogenesis, and neurogenesis. Furthermore, potential mechanisms underlying the role of nidogens in stem cell-based tissue regeneration are also discussed. This concise review is expected to facilitate our existing understanding and utilization of nidogen in tissue engineering and regeneration.
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Naranjo JD, Saldin LT, Sobieski E, Quijano LM, Hill RC, Chan PG, Torres C, Dziki JL, Cramer MC, Lee YC, Das R, Bajwa AK, Nossair R, Klimak M, Marchal L, Patel S, Velankar SS, Hansen KC, McGrath K, Badylak SF. Esophageal extracellular matrix hydrogel mitigates metaplastic change in a dog model of Barrett's esophagus. SCIENCE ADVANCES 2020; 6:eaba4526. [PMID: 32656339 PMCID: PMC7329334 DOI: 10.1126/sciadv.aba4526] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 04/16/2020] [Indexed: 05/17/2023]
Abstract
Chronic inflammatory gastric reflux alters the esophageal microenvironment and induces metaplastic transformation of the epithelium, a precancerous condition termed Barrett's esophagus (BE). The microenvironmental niche, which includes the extracellular matrix (ECM), substantially influences cell phenotype. ECM harvested from normal porcine esophageal mucosa (eECM) was formulated as a mucoadhesive hydrogel, and shown to largely retain basement membrane and matrix-cell adhesion proteins. Dogs with BE were treated orally with eECM hydrogel and omeprazole (n = 6) or omeprazole alone (n = 2) for 30 days. eECM treatment resolved esophagitis, reverted metaplasia to a normal, squamous epithelium in four of six animals, and downregulated the pro-inflammatory tumor necrosis factor-α+ cell infiltrate compared to control animals. The metaplastic tissue in control animals (n = 2) did not regress. The results suggest that in vivo alteration of the microenvironment with a site-appropriate, mucoadhesive ECM hydrogel can mitigate the inflammatory and metaplastic response in a dog model of BE.
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Affiliation(s)
- Juan Diego Naranjo
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
- Department of Surgery, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Lindsey T. Saldin
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Eric Sobieski
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Lina M. Quijano
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Ryan C. Hill
- Department of Biochemistry and Molecular Genetics, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Patrick G. Chan
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
- Department of Cardiothoracic Surgery, UPMC, Pittsburgh, PA 15213, USA
| | - Crisanto Torres
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
- Department of Cardiothoracic Surgery, UPMC, Pittsburgh, PA 15213, USA
| | - Jenna L. Dziki
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
- Department of Surgery, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Madeline C. Cramer
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Yoojin C. Lee
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Rohit Das
- Department of Medicine, Division of Gastroenterology, Hepatology and Nutrition, UPMC, Pittsburgh, PA 15213, USA
| | - Anant K. Bajwa
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Rania Nossair
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Molly Klimak
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Lucile Marchal
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Shil Patel
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Sachin S. Velankar
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
- Department of Chemical Engineering, Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Kirk C. Hansen
- Department of Biochemistry and Molecular Genetics, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Kevin McGrath
- Department of Medicine, Division of Gastroenterology, Hepatology and Nutrition, UPMC, Pittsburgh, PA 15213, USA
| | - Stephen F. Badylak
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
- Department of Surgery, University of Pittsburgh, Pittsburgh, PA 15213, USA
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15261, USA
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3
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Fabris G, Lucantonio A, Hampe N, Noetzel E, Hoffmann B, DeSimone A, Merkel R. Nanoscale Topography and Poroelastic Properties of Model Tissue Breast Gland Basement Membranes. Biophys J 2018; 115:1770-1782. [PMID: 30322796 DOI: 10.1016/j.bpj.2018.09.020] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 09/07/2018] [Accepted: 09/10/2018] [Indexed: 01/19/2023] Open
Abstract
Basement membranes (BMs) are thin layers of condensed extracellular matrix proteins serving as permeability filters, cellular anchoring sites, and barriers against cancer cell invasion. It is believed that their biomechanical properties play a crucial role in determining cellular behavior and response, especially in mechanically active tissues like breast glands. Despite this, so far, relatively little attention has been dedicated to their analysis because of the difficulty of isolating and handling such thin layers of material. Here, we isolated BMs derived from MCF10A spheroids-three-dimensional breast gland model systems mimicking in vitro the most relevant phenotypic characteristics of human breast lobules-and characterized them by atomic force microscopy, enhanced resolution confocal microscopy, and scanning electron microscopy. By performing atomic force microscopy height-clamp experiments, we obtained force-relaxation curves that offered the first biomechanical data on isolated breast gland BMs to our knowledge. Based on enhanced resolution confocal microscopy and scanning electron microscopy imaging data, we modeled the system as a polymer network immersed in liquid and described it as a poroelastic material. Finite-element simulations matching the experimental force-relaxation curves allowed for the first quantification, to our knowledge, of the bulk and shear moduli of the membrane as well as its water permeability. These results represent a first step toward a deeper understanding of the mechanism of tensional homeostasis regulating mammary gland activity as well as its disruption during processes of membrane breaching and metastatic invasion.
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Affiliation(s)
- Gloria Fabris
- Institute of Complex Systems, ICS-7: Biomechanics, Forschungszentrum Jülich, Jülich, Germany; Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, New Jersey
| | | | - Nico Hampe
- Institute of Complex Systems, ICS-7: Biomechanics, Forschungszentrum Jülich, Jülich, Germany
| | - Erik Noetzel
- Institute of Complex Systems, ICS-7: Biomechanics, Forschungszentrum Jülich, Jülich, Germany
| | - Bernd Hoffmann
- Institute of Complex Systems, ICS-7: Biomechanics, Forschungszentrum Jülich, Jülich, Germany
| | | | - Rudolf Merkel
- Institute of Complex Systems, ICS-7: Biomechanics, Forschungszentrum Jülich, Jülich, Germany.
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4
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Sánchez-Sánchez BJ, Urbano JM, Comber K, Dragu A, Wood W, Stramer B, Martín-Bermudo MD. Drosophila Embryonic Hemocytes Produce Laminins to Strengthen Migratory Response. Cell Rep 2018; 21:1461-1470. [PMID: 29117553 PMCID: PMC5695906 DOI: 10.1016/j.celrep.2017.10.047] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Revised: 09/05/2017] [Accepted: 10/11/2017] [Indexed: 12/28/2022] Open
Abstract
The most prominent developmental function attributed to the extracellular matrix (ECM) is cell migration. While cells in culture can produce ECM to migrate, the role of ECM in regulating developmental cell migration is classically viewed as an exogenous matrix presented to the moving cells. In contrast to this view, we show here that Drosophila embryonic hemocytes deposit their own laminins in streak-like structures to migrate efficiently throughout the embryo. With the help of transplantation experiments, live microscopy, and image quantification, we demonstrate that autocrine-produced laminin regulates hemocyte migration by controlling lamellipodia dynamics, stability, and persistence. Proper laminin deposition is regulated by the RabGTPase Rab8, which is highly expressed and required in hemocytes for lamellipodia dynamics and migration. Our results thus support a model in which, during embryogenesis, the Rab8-regulated autocrine deposition of laminin reinforces directional and effective migration by stabilizing cellular protrusions and strengthening otherwise transient adhesion states. Drosophila embryonic hemocytes use autocrine-produced laminins for their migration Autocrine laminins regulate lamellipodia dynamics, stability, and persistence Rab8 regulates laminin deposition and lamellipodia dynamics in migrating hemocytes Laminins deposit in tracks around hemocytes and in a fibrillar mesh over the VNC
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Affiliation(s)
- Besaiz J Sánchez-Sánchez
- CABD (CSIC-Universidad Pablo de Olavide-JA), Sevilla 41013, Spain; Randall Centre for Cell and Molecular Biophysics, King's College London, London SE5 9AP, UK
| | - José M Urbano
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3DY, UK
| | - Kate Comber
- Department of Cellular and Molecular Medicine, Biomedical Sciences, University of Bristol, Bristol BS8 1TD, UK
| | - Anca Dragu
- Randall Centre for Cell and Molecular Biophysics, King's College London, London SE5 9AP, UK
| | - Will Wood
- Department of Cellular and Molecular Medicine, Biomedical Sciences, University of Bristol, Bristol BS8 1TD, UK
| | - Brian Stramer
- Randall Centre for Cell and Molecular Biophysics, King's College London, London SE5 9AP, UK
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5
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Matlin KS, Myllymäki SM, Manninen A. Laminins in Epithelial Cell Polarization: Old Questions in Search of New Answers. Cold Spring Harb Perspect Biol 2017; 9:cshperspect.a027920. [PMID: 28159878 DOI: 10.1101/cshperspect.a027920] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Laminin, a basement membrane protein discovered in 1979, was shortly thereafter implicated in the polarization of epithelial cells in both mammals and a variety of lower organisms. To transduce a spatial cue to the intrinsic polarization machinery, laminin must polymerize into a dense network that forms the foundation of the basement membrane. Evidence suggests that activation of the small GTPase Rac1 by β1-integrins mobilizes laminin-binding integrins and dystroglycan to consolidate formation of the laminin network and initiate rearrangements of both the actin and microtubule cytoskeleton to help establish the apicobasal axis. A key coordinator of spatial signals from laminin is the serine-threonine kinase Par-1, which is known to affect dystroglycan availability, microtubule and actin organization, and lumen formation. The signaling protein integrin-linked kinase (ILK) may also play a role. Despite significant advances, knowledge of the mechanism by which assembled laminin produces a spatial signal remains fragmentary, and much more research into the complex functions of laminin in polarization and other cellular processes is needed.
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Affiliation(s)
- Karl S Matlin
- Department of Surgery, The University of Chicago, Chicago, Illinois 60637-1470
| | - Satu-Marja Myllymäki
- Biocenter Oulu, Oulu Center for Cell-Matrix Research, Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu 90220, Finland
| | - Aki Manninen
- Biocenter Oulu, Oulu Center for Cell-Matrix Research, Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu 90220, Finland
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6
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Colburn ZT, Jones JCR. α 6β 4 Integrin Regulates the Collective Migration of Epithelial Cells. Am J Respir Cell Mol Biol 2017; 56:443-452. [PMID: 27922761 DOI: 10.1165/rcmb.2016-0313oc] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
α6β4 integrin is localized in a unique punctate distribution at the cell-substratum interface along the leading front of single, front-rear-polarized A549 cells. These puncta are interspersed between focal adhesions and lack association with the actin cytoskeleton. Knockdown of β4 integrin in A549 cells inhibits their directed migration, with knockdown cells exhibiting large focal adhesions and reduced actin dynamics. Despite these changes, the speed of knockdown cells is equivalent to control cells. Interestingly, in such cells, α6 integrin retains its punctate distribution. Moreover, in β4 integrin knockdown cells, we observe a loss of β1 integrin from focal adhesions and an enhanced association with α6 integrin. We confirmed the switch in the β integrin binding partner of α6 integrin in the knockdown cells by immunoprecipitation. We next investigated the role of β4 integrin in collective cell migration. Wounded monolayers of β4 integrin knockdown cells exhibit reduced collective migration compared with controls. When we forced expression of β4 integrin in the leader cells of wounded monolayers, collective migration was restored. Similarly, forced expression of β4 integrin in primary rat alveolar epithelial cells also promotes collective cell migration. In addition, we interrogated the pathway by which β4 integrin regulates A549 cell-directed migration. Constitutively active Ras-related C3 botulinum toxin substrate 1 rescues motility defects resulting from β4 integrin deficiency. Together, our results support the hypothesis that α6β4 integrin is a positive regulator of collective cell migration of A549 cells through influence on signal pathways in leader cells.
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Affiliation(s)
- Zachary T Colburn
- School of Molecular Biosciences, Washington State University, Pullman, Washington
| | - Jonathan C R Jones
- School of Molecular Biosciences, Washington State University, Pullman, Washington
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7
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Jones JCR, Kam CY, Harmon RM, Woychek AV, Hopkinson SB, Green KJ. Intermediate Filaments and the Plasma Membrane. Cold Spring Harb Perspect Biol 2017; 9:9/1/a025866. [PMID: 28049646 DOI: 10.1101/cshperspect.a025866] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A variety of intermediate filament (IF) types show intricate association with plasma membrane proteins, including receptors and adhesion molecules. The molecular basis of linkage of IFs to desmosomes at sites of cell-cell interaction and hemidesmosomes at sites of cell-matrix adhesion has been elucidated and involves IF-associated proteins. However, IFs also interact with focal adhesions and cell-surface molecules, including dystroglycan. Through such membrane interactions, it is well accepted that IFs play important roles in the establishment and maintenance of tissue integrity. However, by organizing cell-surface complexes, IFs likely regulate, albeit indirectly, signaling pathways that are key to tissue homeostasis and repair.
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Affiliation(s)
- Jonathan C R Jones
- The School of Molecular Biosciences, Washington State University, Pullman, Washington 99164
| | - Chen Yuan Kam
- Departments of Dermatology and Pathology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611
| | - Robert M Harmon
- Departments of Dermatology and Pathology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611
| | - Alexandra V Woychek
- The School of Molecular Biosciences, Washington State University, Pullman, Washington 99164
| | - Susan B Hopkinson
- The School of Molecular Biosciences, Washington State University, Pullman, Washington 99164
| | - Kathleen J Green
- Departments of Dermatology and Pathology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611
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8
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Haeger SM, Yang Y, Schmidt EP. Heparan Sulfate in the Developing, Healthy, and Injured Lung. Am J Respir Cell Mol Biol 2016; 55:5-11. [PMID: 26982577 PMCID: PMC4942210 DOI: 10.1165/rcmb.2016-0043tr] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Accepted: 03/11/2016] [Indexed: 11/24/2022] Open
Abstract
Remarkable progress has been achieved in understanding the regulation of gene expression and protein translation, and how aberrancies in these template-driven processes contribute to disease pathogenesis. However, much of cellular physiology is controlled by non-DNA, nonprotein mediators, such as glycans. The focus of this Translational Review is to highlight the importance of a specific glycan polymer-the glycosaminoglycan heparan sulfate (HS)-on lung health and disease. We demonstrate how HS contributes to lung physiology and pathophysiology via its actions as both a structural constituent of the lung parenchyma as well as a regulator of cellular signaling. By highlighting current uncertainties in HS biology, we identify opportunities for future high-impact pulmonary and critical care translational investigations.
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Affiliation(s)
- Sarah M. Haeger
- Department of Medicine, University of Colorado School of Medicine, Aurora, Colorado; and
| | - Yimu Yang
- Department of Medicine, University of Colorado School of Medicine, Aurora, Colorado; and
| | - Eric P. Schmidt
- Department of Medicine, University of Colorado School of Medicine, Aurora, Colorado; and
- Department of Medicine, Denver Health Medical Center, Denver, Colorado
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9
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Morales-Nebreda LI, Rogel MR, Eisenberg JL, Hamill KJ, Soberanes S, Nigdelioglu R, Chi M, Cho T, Radigan KA, Ridge KM, Misharin AV, Woychek A, Hopkinson S, Perlman H, Mutlu GM, Pardo A, Selman M, Jones JCR, Budinger GRS. Lung-specific loss of α3 laminin worsens bleomycin-induced pulmonary fibrosis. Am J Respir Cell Mol Biol 2016; 52:503-12. [PMID: 25188360 DOI: 10.1165/rcmb.2014-0057oc] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Laminins are heterotrimeric proteins that are secreted by the alveolar epithelium into the basement membrane, and their expression is altered in extracellular matrices from patients with pulmonary fibrosis. In a small number of patients with pulmonary fibrosis, we found that the normal basement membrane distribution of the α3 laminin subunit was lost in fibrotic regions of the lung. To determine if these changes play a causal role in the development of fibrosis, we generated mice lacking the α3 laminin subunit specifically in the lung epithelium by crossing mice expressing Cre recombinase driven by the surfactant protein C promoter (SPC-Cre) with mice expressing floxed alleles encoding the α3 laminin gene (Lama3(fl/fl)). These mice exhibited no developmental abnormalities in the lungs up to 6 months of age, but, compared with control mice, had worsened mortality, increased inflammation, and increased fibrosis after the intratracheal administration of bleomycin. Similarly, the severity of fibrosis induced by an adenovirus encoding an active form of transforming growth factor-β was worse in mice deficient in α3 laminin in the lung. Taken together, our results suggest that the loss of α3 laminin in the lung epithelium does not affect lung development, but plays a causal role in the development of fibrosis in response to bleomycin or adenovirally delivered transforming growth factor-β. Thus, we speculate that the loss of the normal basement membrane organization of α3 laminin that we observe in fibrotic regions from the lungs of patients with pulmonary fibrosis contributes to their disease progression.
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Affiliation(s)
- Luisa I Morales-Nebreda
- 1 Division of Pulmonary and Critical Care Medicine and the Department of Cell and Molecular Biology, Feinberg School of Medicine at Northwestern University, Chicago, Illinois
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10
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Lost Polarization of Aquaporin4 and Dystroglycan in the Core Lesion after Traumatic Brain Injury Suggests Functional Divergence in Evolution. BIOMED RESEARCH INTERNATIONAL 2015; 2015:471631. [PMID: 26583111 PMCID: PMC4637040 DOI: 10.1155/2015/471631] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Accepted: 08/05/2015] [Indexed: 11/17/2022]
Abstract
Objective. To understand how aquaporin4 (AQP4) and dystroglycan (DG) polarized distribution change and their roles in brain edema formation after traumatic brain injury (TBI). Methods. Brain water content, Evans blue detection, real-time PCR, western blot, and immunofluorescence were used. Results. At an early stage of TBI, AQP4 and DG maintained vessel-like pattern in perivascular endfeet; M1, M23, and M1/M23 were increased in the core lesion. At a later stage of TBI, DG expression was lost in perivascular area, accompanied with similar but delayed change of AQP4 expression; expression of M1, M23, and DG and the ratio of M1/M2 were increased. Conclusion. At an early stage, AQP4 and DG maintained the polarized distribution. Upregulated M1 and M23 could retard the cytotoxic edema formation. At a later stage AQP4 and DG polarized expression were lost from perivascular endfeet and induced the worst cytotoxic brain edema. The alteration of DG expression could regulate that of AQP4 expression after TBI.
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11
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Bijata M, Wlodarczyk J, Figiel I. Dystroglycan controls dendritic morphogenesis of hippocampal neurons in vitro. Front Cell Neurosci 2015; 9:199. [PMID: 26074769 PMCID: PMC4443029 DOI: 10.3389/fncel.2015.00199] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Accepted: 05/09/2015] [Indexed: 11/13/2022] Open
Abstract
Dendritic outgrowth and arborization are important for establishing neural circuit formation. To date, little information exists about the involvement of the extracellular matrix (ECM) and its cellular receptors in these processes. In our studies, we focus on the role of dystroglycan (DG), a cell adhesion molecule that links ECM components to the actin cytoskeleton, in dendritic development and branching. Using a lentiviral vector to deliver short-hairpin RNA (shRNA) that specifically silences DG in cultured hippocampal neurons, we found that DG knockdown exerted an inhibitory effect on dendritic tree growth and arborization. The structural changes were associated with activation of the guanosine triphosphatase Cdc42. The overexpression of DG promoted dendritic length and branching. Furthermore, exposure of the cultures to autoactivating matrix metalloproteinase-9 (aaMMP-9), a β-DG-cleaving protease, decreased the complexity of dendritic arbors. This effect was abolished in neurons that overexpressed a β-DG mutant that was defective in MMP-9-mediated cleavage. Altogether, our results indicate that DG controls dendritic arborization in vitro in MMP-9-dependent manner.
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Affiliation(s)
- Monika Bijata
- Laboratory of Cell Biophysics, Department of Molecular and Cellular Neurobiology, Nencki Institute of Experimental Biology Warsaw, Poland
| | - Jakub Wlodarczyk
- Laboratory of Cell Biophysics, Department of Molecular and Cellular Neurobiology, Nencki Institute of Experimental Biology Warsaw, Poland
| | - Izabela Figiel
- Laboratory of Cell Biophysics, Department of Molecular and Cellular Neurobiology, Nencki Institute of Experimental Biology Warsaw, Poland
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12
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13
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Jeon JE, Schrobback K, Meinert C, Sramek V, Hutmacher DW, Klein TJ. Effect of preculture and loading on expression of matrix molecules, matrix metalloproteinases, and cytokines by expanded osteoarthritic chondrocytes. ACTA ACUST UNITED AC 2013; 65:2356-67. [PMID: 23780780 DOI: 10.1002/art.38049] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2012] [Accepted: 06/04/2013] [Indexed: 11/07/2022]
Abstract
OBJECTIVE One of the pathologic changes that occurs during osteoarthritis (OA) is the degeneration of the pericellular matrix (PCM). Since the PCM is likely to be involved in mechanotransduction, this study was undertaken to investigate the effects of PCM-like matrix accumulation in zonal OA chondrocytes and their influence on chondrocyte response to compression. METHODS Superficial and middle/deep zone chondrocytes from macroscopically normal cartilage of OA knees were expanded and encapsulated in alginate gels. The effects of compression (short-term or long-term) and preculture on chondrocyte expression of various matrix molecules, cytokines, and matrix metalloproteinases (MMPs) were assessed. Additionally, nonexpanded chondrocytes were encapsulated in alginate and cultured in the presence or absence of transforming growth factor β1 (TGFβ1) and dexamethasone and analyzed following short-term compression experiments. RESULTS Expanded OA chondrocytes (superficial and middle/deep zone) that were precultured for 2 weeks under free-swelling conditions prior to dynamic compression responded more sensitively to loading and had increased matrix accumulation, increased interleukin-1β (IL-1β) and IL-4 levels, and decreased levels of MMP-2 (in the middle/deep zone) compared to the nonloaded controls. Compression also decreased MMP-3 and MMP-13 levels even without preculture. Nonexpanded chondrocytes did not respond to compression, but differences in gene expression were found depending on the zone of harvest, time in culture, and medium composition. CONCLUSION Our findings demonstrate that with predeposited PCM-like matrix, compressive stimulation can enhance matrix protein accumulation in expanded OA chondrocytes. Investigations into how PCM or other matrix components differentially affect this balance under mechanical loading may provide invaluable insight into OA pathogenesis and the use of expanded cells in tissue engineering and regenerative medicine-based applications.
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Affiliation(s)
- June E Jeon
- Queensland University of Technology, Brisbane, Queensland, Australia
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14
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Eisenberg JL, Beaumont KG, Takawira D, Hopkinson SB, Mrksich M, Budinger GRS, Jones JCR. Plectin-containing, centrally localized focal adhesions exert traction forces in primary lung epithelial cells. J Cell Sci 2013; 126:3746-55. [PMID: 23750011 DOI: 10.1242/jcs.128975] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Receptor clustering upon cell attachment to the substrate induces assembly of cytoplasmic protein complexes termed focal adhesions (FAs), which connect, albeit indirectly, the extracellular matrix to the cytoskeleton. A subset of cultured primary alveolar epithelial cells (AEC) display a unique pattern of vinculin/paxillin/talin-rich FAs in two concentric circles when cultured on glass and micropatterned substrates: one ring of FAs located at the cell periphery (pFAs), and another FA ring located centrally in the cell (cFAs). Unusually, cFAs associate with an aster-like actin array as well as keratin bundles. Moreover, cFAs show rapid paxillin turnover rates following fluorescence recovery after photobleaching and exert traction forces similar to those generated by FAs at the cell periphery. The plakin protein plectin localizes to cFAs and is normally absent from pFAs, whereas tensin, a marker of mature/fibrillar adhesions, is found in both cFAs and pFAs. In primary AEC in which plectin expression is depleted, cFAs are largely absent, with an attendant reorganization of both the keratin and actin cytoskeletons. We suggest that the mechanical environment in the lung gives rise to the assembly of unconventional FAs in AEC. These FAs not only show a distinctive arrangement, but also possess unique compositional and functional properties.
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Affiliation(s)
- Jessica L Eisenberg
- Department of Cell and Molecular Biology, Northwestern University, Chicago, IL, USA
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15
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Hawkins BT, Gu YH, Izawa Y, Del Zoppo GJ. Disruption of dystroglycan-laminin interactions modulates water uptake by astrocytes. Brain Res 2013; 1503:89-96. [PMID: 23395731 DOI: 10.1016/j.brainres.2013.01.049] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2012] [Revised: 01/29/2013] [Accepted: 01/30/2013] [Indexed: 01/28/2023]
Abstract
Cerebral edema is a serious complication of ischemic brain injury. Cerebral edema includes accumulation of extracellular fluid due to leakage of the brain's microvessel permeability barrier, and swelling of astrocytes as they absorb water from the extracellular space. Expression of matrix adhesion receptors in brain microvessels decreases in ischemic stroke; this contributes to increased microvessel permeability and detachment of astrocytes from the extracellular matrix (ECM). Since loss of the astrocyte adhesion receptor dystroglycan has been associated with disrupted polarization of ion and water channels, we hypothesized that adhesion of astrocytes to the ECM contributes to regulation of water uptake, and that disruption of matrix adhesion impairs the ability of astrocytes to direct water transport. To test this hypothesis, the capacity of astrocytes to take up water was measured using a fluorescence self-quenching assay under both oxygen/glucose deprivation (OGD) and direct antibody-mediated blockade of α-dystroglycan. Both conditions decreased the rate of water uptake. Moreover, inhibiting proteolytic cleavage of dystroglycan that occurs in OGD abrogated the effect of OGD, but not direct blockade of α-dystroglycan, indicating that interfering with dystroglycan-matrix binding itself affects water uptake. Activation of extracellular signal-related kinase (ERK) by OGD was dependent on α-dystroglycan binding, and inhibition of ERK activity with U0126 abrogated the loss of water uptake following OGD. These studies demonstrate for the first time that water uptake in astrocytes is regulated by dystroglycan-dependent signaling associated with matrix adhesion. This presents a novel potential approach to the treatment of cerebral edema.
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Affiliation(s)
- Brian T Hawkins
- Division of Hematology, University of Washington School of Medicine, Harborview Medical Center, PO Box 359756, 325 9th Ave, Seattle, WA 98104, USA.
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16
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Abstract
Laminin 332, composed of the α3, β3 and γ2 chains, is an epithelial-basement membrane specific laminin variant. Its main role in normal tissues is the maintenance of epithelial-mesenchymal cohesion in tissues exposed to external forces, including skin and stratified squamous mucosa. After being secreted and deposited in the extracellular matrix, laminin 332 undergoes physiological maturation processes consisting in the proteolytic processing of domains located within the α3 and the γ2 chains. These maturation events are essential for laminin 332 integration into the basement membrane where it plays an important function in the nucleation and maintenance of anchoring structures. Studies in normal and pathological situations have revealed that laminin 332 can trigger distinct cellular events depending on the level of its proteolytic cleavages. In this review, the biological and structural characteristics of laminin 332 domains are presented and we discuss whether they trigger specific functions.
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Affiliation(s)
- Patricia Rousselle
- SFR BioSciences Gerland-Lyon Sud, Institut de Biologie et Chimie des Protéines, UMR 5305, CNRS, Université Lyon 1, Lyon, France.
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17
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Affiliation(s)
- Anna Domogatskaya
- Division of Matrix Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institute, 171 77 Stockholm, Sweden; , ,
| | - Sergey Rodin
- Division of Matrix Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institute, 171 77 Stockholm, Sweden; , ,
| | - Karl Tryggvason
- Division of Matrix Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institute, 171 77 Stockholm, Sweden; , ,
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18
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Moore CJ, Winder SJ. The inside and out of dystroglycan post-translational modification. Neuromuscul Disord 2012; 22:959-65. [PMID: 22770978 DOI: 10.1016/j.nmd.2012.05.016] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2012] [Revised: 04/27/2012] [Accepted: 05/28/2012] [Indexed: 01/06/2023]
Abstract
In neuromuscular systems dystroglycan provides a vital link between laminin in the extracellular matrix and dystrophin in the membrane cytoskeleton. The integrity of this link is maintained and regulated by post-translational modifications of dystroglycan that have effects both inside and outside the cell. Glycosylation of α-dystroglycan is crucial for its link to laminin and phosphorylation of β-dystroglycan on tyrosine regulates its association with intracellular binding partners. This short review focuses on some of the recent developments in our understanding of the role of these post-translational modification in regulating dystroglycan function, and how new knowledge of signalling through the laminin-dystroglycan axis is leading to hope for treatment for some neuromuscular diseases associated with this adhesion complex.
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Affiliation(s)
- Chris J Moore
- Department of Biomedical Science, University of Sheffield, Firth Court, Western Bank, Sheffield S10 2TN, UK.
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Inflammation modulates expression of laminin in the central nervous system following ischemic injury. J Neuroinflammation 2012; 9:159. [PMID: 22759265 PMCID: PMC3414761 DOI: 10.1186/1742-2094-9-159] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2012] [Accepted: 07/03/2012] [Indexed: 01/02/2023] Open
Abstract
BACKGROUND Ischemic stroke induces neuronal death in the core of the infarct within a few hours and the secondary damage in the surrounding regions over a long period of time. Reduction of inflammation using pharmacological reagents has become a target of research for the treatment of stroke. Cyclooxygenase 2 (COX-2), a marker of inflammation, is induced during stroke and enhances inflammatory reactions through the release of enzymatic products, such as prostaglandin (PG) E2. METHODS Wild-type (WT) and COX-2 knockout (COX-2KO) mice were subjected to middle cerebral artery occlusion (MCAO). Additionally, brain slices derived from these mice or brain microvascular endothelial cells (BMECs) were exposed to oxygen-glucose deprivation (OGD) conditions. The expression levels of extracellular matrix (ECM) proteins were assessed and correlated with the state of inflammation. RESULTS We found that components of the ECM, and specifically laminin, are transiently highly upregulated on endothelial cells after MCAO or OGD. This upregulation is not observed in COX-2KO mice or WT mice treated with COX-2 inhibitor, celecoxib, suggesting that COX-2 is associated with changes in the levels of laminins. CONCLUSIONS Taken together, we report that transient ECM remodeling takes place early after stroke and suggest that this increase in ECM protein expression may constitute an effort to revascularize and oxygenate the tissue.
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Urich D, Eisenberg JL, Hamill KJ, Takawira D, Chiarella SE, Soberanes S, Gonzalez A, Koentgen F, Manghi T, Hopkinson SB, Misharin AV, Perlman H, Mutlu GM, Budinger GRS, Jones JCR. Lung-specific loss of the laminin α3 subunit confers resistance to mechanical injury. J Cell Sci 2012; 124:2927-37. [PMID: 21878500 DOI: 10.1242/jcs.080911] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Laminins are heterotrimeric glycoproteins of the extracellular matrix that are secreted by epithelial cells and which are crucial for the normal structure and function of the basement membrane. We have generated a mouse harboring a conditional knockout of α3 laminin (Lama3(fl/fl)), one of the main laminin subunits in the lung basement membrane. At 60 days after intratracheal treatment of adult Lama3(fl/fl) mice with an adenovirus encoding Cre recombinase (Ad-Cre), the protein abundance of α3 laminin in whole lung homogenates was more than 50% lower than that in control-treated mice, suggesting a relatively long half-life for the protein in the lung. Upon exposure to an injurious ventilation strategy (tidal volume of 35 ml per kg of body weight for 2 hours), the mice with a knockdown of the α3 laminin subunit had less severe injury, as shown by lung mechanics, histology, alveolar capillary permeability and survival when compared with Ad-Null-treated mice. Knockdown of the α3 laminin subunit resulted in evidence of lung inflammation. However, this did not account for their resistance to mechanical ventilation. Rather, the loss of α3 laminin was associated with a significant increase in the collagen content of the lungs. We conclude that the loss of α3 laminin in the alveolar epithelium results in an increase in lung collagen, which confers resistance to mechanical injury.
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Affiliation(s)
- Daniela Urich
- Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
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21
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Waters CM, Roan E, Navajas D. Mechanobiology in lung epithelial cells: measurements, perturbations, and responses. Compr Physiol 2012; 2:1-29. [PMID: 23728969 PMCID: PMC4457445 DOI: 10.1002/cphy.c100090] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Epithelial cells of the lung are located at the interface between the environment and the organism and serve many important functions including barrier protection, fluid balance, clearance of particulate, initiation of immune responses, mucus and surfactant production, and repair following injury. Because of the complex structure of the lung and its cyclic deformation during the respiratory cycle, epithelial cells are exposed to continuously varying levels of mechanical stresses. While normal lung function is maintained under these conditions, changes in mechanical stresses can have profound effects on the function of epithelial cells and therefore the function of the organ. In this review, we will describe the types of stresses and strains in the lungs, how these are transmitted, and how these may vary in human disease or animal models. Many approaches have been developed to better understand how cells sense and respond to mechanical stresses, and we will discuss these approaches and how they have been used to study lung epithelial cells in culture. Understanding how cells sense and respond to changes in mechanical stresses will contribute to our understanding of the role of lung epithelial cells during normal function and development and how their function may change in diseases such as acute lung injury, asthma, emphysema, and fibrosis.
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22
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Abstract
The dermal-epidermal basement membrane is a complex assembly of proteins that provide adhesion and regulate many important processes such as development, wound healing, and cancer progression. This contribution focuses on the structure and function of individual components of the basement membrane, how they assemble together, and how they participate in human tissues and diseases, with an emphasis on skin involvement. Understanding the composition and structure of the basement membrane provides insight into the pathophysiology of inherited blistering disorders, such as epidermolysis bullosa, and acquired bullous diseases, such as the pemphigoid group of autoimmune diseases and epidermolysis bullosa acquisita.
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Affiliation(s)
- Sana Hashmi
- Stanford University School of Medicine, Li Ka Shing Building, 291 Campus Drive, Stanford, CA 94305, USA
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23
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Thomasen H, Pauklin M, Noelle B, Geerling G, Vetter J, Steven P, Steuhl KP, Meller D. The Effect of Long-Term Storage on the Biological and Histological Properties of Cryopreserved Amniotic Membrane. Curr Eye Res 2011; 36:247-55. [DOI: 10.3109/02713683.2010.542267] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Eisenberg JL, Safi A, Wei X, Espinosa HD, Budinger GS, Takawira D, Hopkinson SB, Jones JC. Substrate stiffness regulates extracellular matrix deposition by alveolar epithelial cells. ACTA ACUST UNITED AC 2011. [PMID: 23204878 DOI: 10.2147/rrb.s13178] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
AIM: The aim of the study was to address whether a stiff substrate, a model for pulmonary fibrosis, is responsible for inducing changes in the phenotype of alveolar epithelial cells (AEC) in the lung, including their deposition and organization of extracellular matrix (ECM) proteins. METHODS: Freshly isolated lung AEC from male Sprague Dawley rats were seeded onto polyacrylamide gel substrates of varying stiffness and analyzed for expression and organization of adhesion, cytoskeletal, differentiation, and ECM components by Western immunoblotting and confocal immunofluorescence microscopy. RESULTS: We observed that substrate stiffness influences cell morphology and the organization of focal adhesions and the actin cytoskeleton. Surprisingly, however, we found that substrate stiffness has no influence on the differentiation of type II into type I AEC, nor does increased substrate stiffness lead to an epithelial-mesenchymal transition. In contrast, our data indicate that substrate stiffness regulates the expression of the α3 laminin subunit by AEC and the organization of both fibronectin and laminin in their ECM. CONCLUSIONS: An increase in substrate stiffness leads to enhanced laminin and fibronectin assembly into fibrils, which likely contributes to the disease phenotype in the fibrotic lung.
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Affiliation(s)
- Jessica L Eisenberg
- Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA ; Division of Pulmonary Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
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25
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Takawira D, Budinger GRS, Hopkinson SB, Jones JCR. A dystroglycan/plectin scaffold mediates mechanical pathway bifurcation in lung epithelial cells. J Biol Chem 2010; 286:6301-10. [PMID: 21149456 DOI: 10.1074/jbc.m110.178988] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
In alveolar epithelial cells (AECs), the membrane-anchored proteoglycan dystroglycan (DG) is a mechanoreceptor that transmits mechanical stretch forces to activate independently the ERK1/2 and the adenosine 5'-monophosphate-activated protein kinase (AMPK) signaling cascades in a process called pathway bifurcation. We tested the hypothesis that the cytoskeleton cross-linker plectin, known to bind both DG and AMPK in muscle cells, acts as a scaffold to regulate DG-mediated mechanical stimulation and pathway bifurcation. We demonstrate that plectin and DG form a complex in AECs and that this complex interacts with ERK1/2 and AMPK. Plectin knockdown reduces DG interaction with AMPK but not with ERK1/2. Despite this, mechanoactivation of both signaling pathways is significantly attenuated in AECs deficient in plectin. Thus, DG has the dual role of mechanical receptor and scaffold for ERK1/2, whereas plectin acts as a scaffold for AMPK signaling but is also required for DG-mediated ERK1/2 activation. We conclude that the DG-plectin complex plays a central role in transmitting mechanical stress from the extracellular matrix to the cytoplasm.
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Affiliation(s)
- Desire Takawira
- Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611, USA
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26
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Brosig M, Ferralli J, Gelman L, Chiquet M, Chiquet-Ehrismann R. Interfering with the connection between the nucleus and the cytoskeleton affects nuclear rotation, mechanotransduction and myogenesis. Int J Biochem Cell Biol 2010; 42:1717-28. [DOI: 10.1016/j.biocel.2010.07.001] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2010] [Revised: 07/01/2010] [Accepted: 07/03/2010] [Indexed: 01/02/2023]
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27
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Kruegel J, Miosge N. Basement membrane components are key players in specialized extracellular matrices. Cell Mol Life Sci 2010; 67:2879-95. [PMID: 20428923 PMCID: PMC2921489 DOI: 10.1007/s00018-010-0367-x] [Citation(s) in RCA: 164] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2010] [Revised: 03/17/2010] [Accepted: 03/24/2010] [Indexed: 01/11/2023]
Abstract
More than three decades ago, basement membranes (BMs) were described as membrane-like structures capable of isolating a cell from and connecting a cell to its environment. Since this time, it has been revealed that BMs are specialized extracellular matrices (sECMs) with unique components that support important functions including differentiation, proliferation, migration, and chemotaxis of cells during development. The composition of these sECM is as unique as the tissues to which they are localized, opening the possibility that such matrices can fulfill distinct functions. Changes in BM composition play significant roles in facilitating the development of various diseases. Furthermore, tissues have to provide sECM for their stem cells during development and for their adult life. Here, we briefly review the latest research on these unique sECM and their components with a special emphasis on embryonic and adult stem cells and their niches.
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Affiliation(s)
- Jenny Kruegel
- Tissue Regeneration Work Group, Department of Prosthodontics, Georg August University, Robert-Koch-Str. 40, 37075 Göttingen, Germany
| | - Nicolai Miosge
- Tissue Regeneration Work Group, Department of Prosthodontics, Georg August University, Robert-Koch-Str. 40, 37075 Göttingen, Germany
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28
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Thompson O, Moore CJ, Hussain SA, Kleino I, Peckham M, Hohenester E, Ayscough KR, Saksela K, Winder SJ. Modulation of cell spreading and cell-substrate adhesion dynamics by dystroglycan. J Cell Sci 2010; 123:118-27. [PMID: 20016072 DOI: 10.1242/jcs.047902] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Dystroglycan is a ubiquitously expressed cell adhesion protein. Its principal role has been determined as a component of the dystrophin-glycoprotein complex of muscle, where it constitutes a key component of the costameric cell adhesion system. To investigate more fundamental aspects of dystroglycan function in cell adhesion, we examined the role of dystroglycan in the dynamics and assembly of cellular adhesions in myoblasts. We show that beta-dystroglycan is recruited to adhesion structures and, based on staining for vinculin, that overexpression or depletion of dystroglycan affects both size and number of fibrillar adhesions. Knockdown of dystroglycan increases the size and number of adhesions, whereas overexpression decreases the number of adhesions. Dystroglycan knockdown or overexpression affects the ability of cells to adhere to different substrates, and has effects on cell migration that are consistent with effects on the formation of fibrillar adhesions. Using an SH3 domain proteomic screen, we identified vinexin as a binding partner for dystroglycan. Furthermore, we show that dystroglycan can interact indirectly with vinculin by binding to the vinculin-binding protein vinexin, and that this interaction has a role in dystroglycan-mediated cell adhesion and spreading. For the first time, we also demonstrate unequivocally that beta-dystroglycan is a resident of focal adhesions.
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Affiliation(s)
- Oliver Thompson
- Departments of Biomedical Science, University of Sheffield, Western Bank, Sheffield, S10 2TN, UK
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Hamill KJ, Kligys K, Hopkinson SB, Jones JCR. Laminin deposition in the extracellular matrix: a complex picture emerges. J Cell Sci 2010; 122:4409-17. [PMID: 19955338 DOI: 10.1242/jcs.041095] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Laminins are structural components of basement membranes. In addition, they are key extracellular-matrix regulators of cell adhesion, migration, differentiation and proliferation. This Commentary focuses on a relatively understudied aspect of laminin biology: how is laminin deposited into the extracellular matrix? This topic has fascinated researchers for some time, particularly considering the diversity of patterns of laminin that can be visualized in the matrix of cultured cells. We discuss current ideas of how laminin matrices are assembled, the role of matrix receptors in this process and how laminin-associated proteins modulate matrix deposition. We speculate on the role of signaling pathways that are involved in laminin-matrix deposition and on how laminin patterns might play an important role in specifying cell behaviors, especially directed migration. We conclude with a description of new developments in the way that laminin deposition is being studied, including the use of tagged laminin subunits that should allow the visualization of laminin-matrix deposition and assembly by living cells.
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Affiliation(s)
- Kevin J Hamill
- Department of Cell and Molecular Biology, Northwestern University Medical School, Chicago, IL 60611, USA
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30
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Ko MS, Marinkovich MP. Role of dermal-epidermal basement membrane zone in skin, cancer, and developmental disorders. Dermatol Clin 2010; 28:1-16. [PMID: 19945611 DOI: 10.1016/j.det.2009.10.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The dermal-epidermal basement membrane zone is an important epithelial and stromal interface, consisting of an intricately organized collection of intracellular, transmembrane, and extracellular matrix proteins. The basement membrane zone has several main functions including acting as a permeability barrier, forming an adhesive interface between epithelial cells and the underlying matrix, and controlling cellular organization and differentiation. This article identifies key molecular players of the dermal-epidermal membrane zone, and highlights recent research studies that have identified structural and functional roles of these components in the context of various blistering, neoplastic, and developmental syndromes.
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Affiliation(s)
- Myung S Ko
- Program in Epithelial Biology, Stanford University School of Medicine, 269 Campus Drive, Stanford, CA 94305, USA
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31
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Moore CJ, Winder SJ. Dystroglycan versatility in cell adhesion: a tale of multiple motifs. Cell Commun Signal 2010; 8:3. [PMID: 20163697 PMCID: PMC2834674 DOI: 10.1186/1478-811x-8-3] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2009] [Accepted: 02/17/2010] [Indexed: 12/02/2022] Open
Abstract
Dystroglycan is a ubiquitously expressed heterodimeric adhesion receptor. The extracellular α-subunit makes connections with a number of laminin G domain ligands including laminins, agrin and perlecan in the extracellular matrix and the transmembrane β-subunit makes connections to the actin filament network via cytoskeletal linkers including dystrophin, utrophin, ezrin and plectin, depending on context. Originally discovered as part of the dystrophin glycoprotein complex of skeletal muscle, dystroglycan is an important adhesion molecule and signalling scaffold in a multitude of cell types and tissues and is involved in several diseases. Dystroglycan has emerged as a multifunctional adhesion platform with many interacting partners associating with its short unstructured cytoplasmic domain. Two particular hotspots are the cytoplasmic juxtamembrane region and at the very carboxy terminus of dystroglycan. Regions which between them have several overlapping functions: in the juxtamembrane region; a nuclear localisation signal, ezrin/radixin/moesin protein, rapsyn and ERK MAP Kinase binding function, and at the C terminus a regulatory tyrosine governing WW, SH2 and SH3 domain interactions. We will discuss the binding partners for these motifs and how their interactions and regulation can modulate the involvement of dystroglycan in a range of different adhesion structures and functions depending on context. Thus dystroglycan presents as a multifunctional scaffold involved in adhesion and adhesion-mediated signalling with its functions under exquisite spatio-temporal regulation.
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Affiliation(s)
- Chris J Moore
- Department of Biomedical Science, University of Sheffield, Firth Court, Western Bank, Sheffield, S10 2TN, UK.
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Hamill KJ, Paller AS, Jones JCR. Adhesion and migration, the diverse functions of the laminin alpha3 subunit. Dermatol Clin 2010; 28:79-87. [PMID: 19945619 DOI: 10.1016/j.det.2009.10.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The laminins are a secreted family of heterotrimeric molecules essential for basement membrane formation, structure, and function. It is now well established that the alpha3 subunit of laminins-332, -321, and -311 plays an important role in mediating epidermal-dermal integrity and is essential for the skin to withstand mechanical stresses. These laminins also regulate cell migration and mechanosignal transduction. This article provides an overview of the gene, transcripts, and protein structures of laminin alpha3. Also discussed are the proposed functions for the alpha3 subunit-containing laminins.
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Affiliation(s)
- Kevin J Hamill
- Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, 303 East Chicago Avenue, Tarry 8-746, Chicago, IL 60611, USA.
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Abstract
Lung function is inextricably linked to mechanics. On short timescales every breath generates dynamic cycles of cell and matrix stretch, along with convection of fluids in the airways and vasculature. Perturbations such airway smooth muscle shortening or surfactant dysfunction rapidly alter respiratory mechanics, with profound influence on lung function. On longer timescales, lung development, maturation, and remodeling all strongly depend on cues from the mechanical environment. Thus mechanics has long played a central role in our developing understanding of lung biology and respiratory physiology. This concise review focuses on progress over the past 5 years in elucidating the molecular origins of lung mechanical behavior, and the cellular signaling events triggered by mechanical perturbations that contribute to lung development, homeostasis, and injury. Special emphasis is placed on the tools and approaches opening new avenues for investigation of lung behavior at integrative cellular and molecular scales. We conclude with a brief summary of selected opportunities and challenges that lie ahead for the lung mechanobiology research community.
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Comparison of cryopreserved and air-dried human amniotic membrane for ophthalmologic applications. Graefes Arch Clin Exp Ophthalmol 2009; 247:1691-700. [PMID: 19693529 DOI: 10.1007/s00417-009-1162-y] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2009] [Revised: 06/19/2009] [Accepted: 07/22/2009] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Cryopreserved amniotic membrane (Cryo-AM) is widely used in ocular surface surgery because of its positive effect on wound healing and its anti-inflammatory properties. A new peracetic acid/ethanol sterilized air-dried amniotic membrane (AD-AM) recently became available which might be an alternative to Cryo-AM. Our aim was to compare AM preserved with both methods with regard to the release of wound-healing modulating proteins, the preservation of basement membrane components, and the ability to serve as a substrate for the cultivation of human limbal epithelial cells (HLECs). METHODS Pieces of Cryo-AM and AD-AM from three different donors were incubated in DMEM for five days. The culture supernatant was collected after an incubation period of 0.1, 24, 48, 72 and 120 h; in the case of AD-AM, this period was extended up to 14 days. TIMP-1, IL-1ra, CTGF and TGF-beta1 were detected in the culture supernatant using Western blotting. Twenty human limbal epithelial cultures were initiated on both AD- and Cryo-AM. The cultures were analyzed morphologically, and the outgrowth area was measured in 3-day intervals. Cryosections of Cryo- and AD-AM from three different donors were analyzed histochemically to detect the basement membrane components collagen IV, collagen VII, laminin, laminin 5 and fibronectin. RESULTS The release of TIMP-1, IL-1ra and TGF-beta1 from Cryo-AM was constant for the studied period. CTGF showed a stronger signal after 120 h. None of the analyzed proteins, except for a small amount of IL-1ra, could be detected in the supernatant of AD-AM. An outgrowth of HLEC was observed in all cultures on Cryo-AM, but in only 30% of cultures on AD-AM. The outgrowth area on Cryo-AM was at all time points significantly higher than on AD-AM (p < 0.0001). Collagen IV, -VII, laminins and fibronectin were detectable in the basement membrane of Cryo-AM, but only collagen IV and fibronectin in AD-AM. CONCLUSIONS Cryo-AM is a more suitable substrate for the cultivation of HLECs than AD-AM. The higher outgrowth rate of cultured limbal epithelium, release of intact soluble wound-healing modulating factors and a better preservation of basement membrane components suggest the superiority of Cryo-AM for use in ophthalmology in comparison to AD-AM.
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Boudreault F, Tschumperlin DJ. Stretch-induced mitogen-activated protein kinase activation in lung fibroblasts is independent of receptor tyrosine kinases. Am J Respir Cell Mol Biol 2009; 43:64-73. [PMID: 19684308 DOI: 10.1165/rcmb.2009-0092oc] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Lung growth and remodeling are modulated by mechanical stress, with fibroblasts thought to play a leading role. Little mechanistic information is available about how lung fibroblasts respond to mechanical stress. We exposed cultured lung fibroblasts to tonic stretch and measured changes in phosphorylation status of mitogen-activated protein kinases (MAPKs), selected receptor tyrosine kinases (RTKs), and phospholipase Cgamma1 (PLCgamma1) and activation of the small G-protein Ras. Human lung fibroblasts (LFs) were seeded on matrix-coated silicone membranes and exposed to equibiaxial 10 to 40% static stretch or 20% contraction. LFs were stimulated with EGF, FGF2, or PDGF-BB or exposed to stretch in the presence of inhibitors of EGFR (AG1478), FGFR (PD173074), and PDGFR (AG1296). Phospho-MAPK, phospho-RTK, and phospho-PLCgamma1 levels were measured by Western blotting. Active GTP-Ras was quantified by immunoblotting after pull-down with a glutathione S-transferase-Raf-RBD construct. Normalized p-ERK1/2, p-JNK, and p-p38 levels increased after stretch but not contraction. Ligands to RTKs broadly stimulated MAPKs, with the responses to EGF and PDGF most similar to stretch in terms of magnitude and rank order of MAPK responses. Stretching cells failed to elicit measurable activation of EGFR, FGFR (FRS2alpha phosphorylation), or PDGFR. Potent inhibitors of the kinase activity of each receptor failed to attenuate stretch-induced MAPK activation. PLCgamma1 and Ras, prominent effectors downstream of RTKs, were not activated by stretch. Our findings demonstrate that MAPKs are potently activated by stretch in lung fibroblasts, but, in contrast to stress responses observed in other cell types, RTKs are not necessary for stretch-induced MAPK activation in LFs.
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Affiliation(s)
- Francis Boudreault
- Department of Environmental Health, Harvard School of Public Health, 665 Huntington Ave, Boston, MA 02115, USA
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Hopkinson SB, DeBiase PJ, Kligys K, Hamill K, Jones JCR. Fluorescently tagged laminin subunits facilitate analyses of the properties, assembly and processing of laminins in live and fixed lung epithelial cells and keratinocytes. Matrix Biol 2008; 27:640-7. [PMID: 18617003 DOI: 10.1016/j.matbio.2008.06.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2008] [Revised: 06/09/2008] [Accepted: 06/10/2008] [Indexed: 01/11/2023]
Abstract
Recent analyses of collagen, elastin and fibronectin matrix assembly, organization and remodeling have been facilitated by the use of tagged proteins that can be visualized without the need for antibody labeling. Here, we report the generation of C-terminal tagged, full-length and "processed" (alpha3DeltaLG4-5) human alpha3 as well as C-terminal tagged, full-length human beta3 laminin subunits in adenoviral vectors. Human epidermal keratinocytes (HEKs) and human bronchial epithelial (BEP2D) cells, which assemble laminin-332-rich matrices, as well as primary rat lung alveolar type II (ATII) cells, which elaborate a fibrous network rich in laminin-311, were infected with adenovirus encoding the tagged human laminin subunits. In HEKs and BEP2D cells, tagged, full-length alpha3, alpha3DeltaLG4-5 and beta3 laminin subunits incorporate into arrays of matrix organized into patterns that are comparable to those observed when such cells are stained using laminin-332 subunit antibody probes. Moreover, HEKs and BEP2Ds move over these tagged, laminin-332-rich matrix arrays. We have also used the tagged beta3 laminin subunit-containing matrices to demonstrate that assembled laminin-332 arrays influence laminin matrix secretion and/or assembly. In the case of rat ATII cells, although tagged alpha3 laminin subunits are not detected in the matrix of rat ATII cells infected with virus encoding full-length human alpha3 laminin protein, processed human alpha3 laminin subunits are incorporated into an extracellular fibrous array. We discuss how these novel laminin reagents can be used to study the organization, processing and assembly of laminin matrices and how they provide new insights into the potential functional importance of laminin fragments.
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Affiliation(s)
- Susan B Hopkinson
- Division of Pulmonary and Critical Care Medicine, The Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611, USA
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Budinger GRS, Urich D, DeBiase PJ, Chiarella SE, Burgess ZO, Baker CM, Soberanes S, Mutlu GM, Jones JCR. Stretch-induced activation of AMP kinase in the lung requires dystroglycan. Am J Respir Cell Mol Biol 2008; 39:666-72. [PMID: 18556591 DOI: 10.1165/rcmb.2007-0432oc] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Lung cells are exposed to cyclic stretch during normal respiration and during positive pressure mechanical ventilation administered to support gas exchange. Dystroglycan is a ubiquitously expressed matrix receptor that is required for normal basement membrane formation during embryogenesis and for maintaining the function of skeletal muscle myocytes and neurons where it links cells to matrix. We previously reported that equibiaxial stretch of primary alveolar epithelial cells activated the MAP kinase pathway ERK1/2 through a mechanism that required an interaction between dystroglycan and matrix. We determined whether this mechanism of mechanotransduction activates other signaling cascades in lung epithelium. Exposure of rat epithelial alveolar type II cells (AEC) to cyclic mechanical stretch resulted in activation of 5' AMP-activated protein kinase (AMPK). This response was not affected by pretreatment of AEC with the ERK inhibitor PD98059 but was inhibited by knockdown in dystroglycan expression. Moreover, production of reactive oxygen species was enhanced in mechanically stimulated AEC in which dystroglycan was knocked down. This enhancement was reversed by treatment of AEC with an AMPK activator. Activation of AMPK was also observed in lung homogenates from mice after 15 minutes of noninjurious mechanical ventilation. Furthermore, knockdown of dystroglycan in the lungs of mice using an adenovirus encoding a dystroglycan shRNA prevented the stretch-induced activation of AMPK. These results suggest that exposure to cyclic stretch activates the metabolic sensing pathway AMPK in the lung epithelium and supports a novel role for dystroglycan in this mechanotransduction.
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Affiliation(s)
- G R Scott Budinger
- Division of Pulmonary and Critical Care Medicine, The Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611, USA.
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Abstract
PURPOSE OF REVIEW Peripheral airways are less than 2 mm in diameter and comprise a relatively large cross-sectional area, which allows for slower, laminar airflow. They include both membranous bronchioles and gas exchange ducts, and have been referred to in the past as the 'quiet zone', partly because these structures were felt to contribute little to lung mechanics, and partly because they are difficult to study directly. RECENT FINDINGS Recent studies suggest that peripheral airway dysfunction plays a significant role in acute respiratory distress syndrome, which may be exacerbated by injurious mechanical ventilation strategies. The presence of elevated airways resistance, intrinsic positive end-expiratory pressure or a lower inflection point on a pressure-volume curve of the respiratory system may indicate presence of impaired peripheral airway function. In-vitro animal and human studies have begun to elucidate the signaling mechanisms responsible for stretch and shear mediated cellular injury. SUMMARY Understanding the pathophysiology of peripheral airway dysfunction in acute respiratory distress syndrome and mechanical ventilation continues to evolve. Greater insight into the signaling mechanisms involved in cellular injury and repair will lead to further alterations in mechanical ventilation strategies, and may lead to specific treatment options.
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Cerecedo D, Cisneros B, Suárez-Sánchez R, Hernández-González E, Galván I. beta-Dystroglycan modulates the interplay between actin and microtubules in human-adhered platelets. Br J Haematol 2008; 141:517-28. [PMID: 18341635 DOI: 10.1111/j.1365-2141.2008.07048.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
To maintain the continuity of an injured blood vessel, platelets change shape, secrete granule contents, adhere, aggregate, and retract in a haemostatic plug. Ordered arrays of microtubules, microfilaments, and associated proteins are responsible for these platelet responses. In full-spread platelets, microfilament bundles in association with other cytoskeleton proteins are anchored in focal contacts. Recent studies in migrating cells suggest that co-ordination and direct physical interaction of microtubules and actin network modulate adhesion development. In platelets, we have proposed a feasible association between these two cytoskeletal systems, as well as the participation of the dystrophin-associated protein complex, as part of the focal adhesion complex. The present study analysed the participation of microtubules and actin during the platelet adhesion process. Confocal microscopy, fluorescence resonance transfer energy and immunoprecipitation assays were used to provide evidence of a cross-talk between these two cytoskeletal systems. Interestingly, beta-dystroglycan was found to act as an interplay protein between actin and microtubules and an additional communication between these two cytoskeleton networks was maintained through proteins of focal adhesion complex. Altogether our data are indicative of a dynamic co-participation of actin filaments and microtubules in modulating focal contacts to achieve platelet function.
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Affiliation(s)
- Doris Cerecedo
- Laboratorio de Hematobiología, Escuela Nacional de Medicina y Homeopatía, Instituto Politécnico Nacional (IPN), México.
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Dolinay T, Wu W, Kaminski N, Ifedigbo E, Kaynar AM, Szilasi M, Watkins SC, Ryter SW, Hoetzel A, Choi AMK. Mitogen-activated protein kinases regulate susceptibility to ventilator-induced lung injury. PLoS One 2008; 3:e1601. [PMID: 18270588 PMCID: PMC2223071 DOI: 10.1371/journal.pone.0001601] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2007] [Accepted: 01/17/2008] [Indexed: 01/09/2023] Open
Abstract
Background Mechanical ventilation causes ventilator-induced lung injury in animals and humans. Mitogen-activated protein kinases have been implicated in ventilator-induced lung injury though their functional significance remains incomplete. We characterize the role of p38 mitogen-activated protein kinase/mitogen activated protein kinase kinase-3 and c-Jun-NH2-terminal kinase-1 in ventilator-induced lung injury and investigate novel independent mechanisms contributing to lung injury during mechanical ventilation. Methodology and Principle Findings C57/BL6 wild-type mice and mice genetically deleted for mitogen-activated protein kinase kinase-3 (mkk-3−/−) or c-Jun-NH2-terminal kinase-1 (jnk1−/−) were ventilated, and lung injury parameters were assessed. We demonstrate that mkk3−/− or jnk1−/− mice displayed significantly reduced inflammatory lung injury and apoptosis relative to wild-type mice. Since jnk1−/− mice were highly resistant to ventilator-induced lung injury, we performed comprehensive gene expression profiling of ventilated wild-type or jnk1−/− mice to identify novel candidate genes which may play critical roles in the pathogenesis of ventilator-induced lung injury. Microarray analysis revealed many novel genes differentially expressed by ventilation including matrix metalloproteinase-8 (MMP8) and GADD45α. Functional characterization of MMP8 revealed that mmp8−/− mice were sensitized to ventilator-induced lung injury with increased lung vascular permeability. Conclusions We demonstrate that mitogen-activated protein kinase pathways mediate inflammatory lung injury during ventilator-induced lung injury. C-Jun-NH2-terminal kinase was also involved in alveolo-capillary leakage and edema formation, whereas MMP8 inhibited alveolo-capillary protein leakage.
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Affiliation(s)
- Tamás Dolinay
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, Unites States of America
- Department of Pulmonology, University of Debrecen Medical and Health Science Center, Debrecen, Hungary
| | - Wei Wu
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, Unites States of America
| | - Naftali Kaminski
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, Unites States of America
| | - Emeka Ifedigbo
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, Unites States of America
| | - A. Murat Kaynar
- Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Mária Szilasi
- Department of Pulmonology, University of Debrecen Medical and Health Science Center, Debrecen, Hungary
| | - Simon C. Watkins
- Department of Cell Biology and Physiology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Stefan W. Ryter
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, Unites States of America
| | - Alexander Hoetzel
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, Unites States of America
- Department of Anesthesiology and Critical Care Medicine, University of Freiburg, Freiburg, Germany
| | - Augustine M. K. Choi
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, Unites States of America
- Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
- * To whom correspondence should be addressed. E-mail:
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Effects of mechanical ventilation on the extracellular matrix. Intensive Care Med 2008; 34:631-9. [PMID: 18264691 DOI: 10.1007/s00134-007-0964-9] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2006] [Accepted: 11/11/2007] [Indexed: 01/30/2023]
Abstract
The extracellular matrix (ECM) plays an important role in the biomechanical behaviour of the lung parenchyma. The ECM is composed of a three-dimensional fibre mesh filled with different macromolecules, including the glycosaminoglycans and the proteoglycans, which have important functions in many lung pathophysiological processes: (1) regulating the hydration and water homeostasis, (2) maintaining the structure and function, (3) modulating the inflammatory response, and (4) influencing tissue repair and remodelling. Ventilator-induced lung injury is the result of a complex interplay among various mechanical forces acting on lung structures such as the epithelial and endothelial cells, the extracellular matrix, and the peripheral airways during mechanical ventilation. Although excellent reviews have synthesized our current knowledge of the role of repeated cyclic stretch and high tidal volume ventilation on alveolar and endothelial cells, few have addressed the effects of mechanical ventilation on the ECM. The present review focused on the organization of the ECM, mechanotransduction and ECM interactions, and the effects of mechanical ventilation on the ECM. The study of the ECM may be useful to improve our understanding of the pathophysiology of lung damage induced by mechanical ventilation.
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Pelosi P, Rocco PRM, Negrini D, Passi A. The extracellular matrix of the lung and its role in edema formation. AN ACAD BRAS CIENC 2007; 79:285-97. [PMID: 17625682 DOI: 10.1590/s0001-37652007000200010] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2007] [Accepted: 04/24/2007] [Indexed: 11/22/2022] Open
Abstract
The extracellular matrix is composed of a three-dimensional fiber mesh filled with different macromolecules such as: collagen (mainly type I and III), elastin, glycosaminoglycans, and proteoglycans. In the lung, the extracellular matrix has several functions which provide: 1) mechanical tensile and compressive strength and elasticity, 2) low mechanical tissue compliance contributing to the maintenance of normal interstitial fluid dynamics, 3) low resistive pathway for an effective gas exchange, d) control of cell behavior by the binding of growth factors, chemokines, cytokines and the interaction with cell-surface receptors, and e) tissue repair and remodeling. Fragmentation and disorganization of extracellular matrix components comprises the protective role of the extracellular matrix, leading to interstitial and eventually severe lung edema. Thus, once conditions of increased microvascular filtration are established, matrix remodeling proceeds fairly rapidly due to the activation of proteases. Conversely, a massive matrix deposition of collagen fiber decreases interstitial compliance and therefore makes the tissue safety factor stronger. As a result, changes in lung extracellular matrix significantly affect edema formation and distribution in the lung.
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Affiliation(s)
- Paolo Pelosi
- Servizio di Anestesia B, Department of Ambient, Health and Safety, University of Insubria, and Ospedale di Circolo e Fondazione Macchi, Varese, Italy.
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Chernousov MA, Kaufman SJ, Stahl RC, Rothblum K, Carey DJ. α7β1 integrin is a receptor for laminin-2 on Schwann cells. Glia 2007; 55:1134-44. [PMID: 17598176 DOI: 10.1002/glia.20536] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The Schwann cell basal lamina acts as an organizer of peripheral nerve tissue and influences many aspects of cell behavior during development and regeneration. A principal component of the Schwann cell basal lamina is laminin-2. This study was undertaken to identify Schwann cell receptors for laminin-2. We found that among several Schwann cell integrins that can potentially interact with laminin-2, only alpha7beta1 bound to laminin-2-Sepharose. Dystroglycan, a non-integrin Schwann cell receptor for laminin-2 identified previously, was also found to bind to laminin-2-Sepharose. Antibody to the alpha7 integrin subunit partially inhibited Schwann cell adhesion to laminin-2. Small interfering RNA-mediated suppression of either alpha7 integrin or dystroglycan expression decreased adhesion and spreading of Schwann cells on laminin-2, whereas knocking down both proteins together inhibited adhesion and spreading on laminin-2 almost completely. alpha7 integrin and dystroglycan both colocalized with laminin-2 containing basal lamina tubes in differentiating neuron-Schwann cell cocultures. The alpha7beta1 integrin also coprecipitates with focal adhesion kinase in differentiating cocultures. These findings strongly suggest that alpha7beta1 integrin is a Schwann cell receptor for laminin-2 that provides transmembrane linkage between the Schwann cell basal lamina and cytoskeleton.
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Cattaruzza S, Perris R. Approaching theProteoglycome: Molecular Interactions of Proteoglycans and Their Functional Output. Macromol Biosci 2006; 6:667-80. [PMID: 16881045 DOI: 10.1002/mabi.200600100] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
[Image: see text] Through their diverse core protein modules and glycan/glycosaminoglycan moieties, proteoglycans may engage in numerous cellular and molecular interactions which are dispensable during embryogenesis, are essential for the maintenance of a healthy state and are prone to modulation in pathological conditions. Proteoglycan interactions may involve binding to other structural components of the ECM, to cell surface receptors, to membrane-associated components, and to soluble signaling molecules, which through this interaction may become entrapped in the ECM or sequestered at the cell surface. Understanding of these multiple interplays is therefore of paramount importance and requires a detailed mapping through what we define as the proteoglycome.
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Affiliation(s)
- Sabrina Cattaruzza
- Department of Evolutionary and Functional Biology, University of Parma, Viale delle Scienze 11/A, Parma (PR) 43100, Italy
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Lien CF, Hazai D, Yeung D, Tan J, Füchtbauer EM, Jancsik V, Górecki DC. Expression of alpha-dystrobrevin in blood-tissue barriers: sub-cellular localisation and molecular characterisation in normal and dystrophic mice. Cell Tissue Res 2006; 327:67-82. [PMID: 16868787 DOI: 10.1007/s00441-006-0241-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2006] [Accepted: 05/09/2006] [Indexed: 11/30/2022]
Abstract
The alpha- and beta-dystrobrevins (DBs) belong to a family of dystrophin-related and dystrophin-associated proteins that are members of the dystrophin-associated protein complex (DAPC). This complex provides a link between the cytoskeleton and the extracellular matrix or other cells. However, specific functions of the two dystrobrevins remain largely unknown, with alpha-DB being believed to have a role mainly in skeletal muscle. Here, we describe previously unknown expression patterns and the localisation and molecular characteristics of alpha-DB isoforms in non-muscle mouse tissues. We demonstrate a highly specific sub-cellular distribution of alpha-DB in organs forming blood-tissue barriers. We show alpha-DB expression and localisation in testicular Sertoli cells, stomach and respiratory epithelia and provide electron-microscopic evidence for its immunolocalisation in these cells and in the central nervous system. Moreover, we present the molecular characterisation of alpha-DB transcript in these tissues and provide evidence for a distinct heterogeneity of associations between alpha-DB and dystrophins and utrophin in normal and dystrophic non-muscle tissues. Together, our results indicate that alpha-DB, in addition to its role in skeletal muscle, may also be required for the proper function of specific non-muscle tissues and that disruption of DAPC might lead to tissue-blood barrier abnormalities.
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Affiliation(s)
- Chun Fu Lien
- Molecular Medicine, Institute of Biomedical and Biomolecular Sciences, School of Pharmacy and Biomedical Sciences, University of Portsmouth, St. Michael's Building, White Swan Road, Portsmouth, UK
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Batchelor CL, Winder SJ. Sparks, signals and shock absorbers: how dystrophin loss causes muscular dystrophy. Trends Cell Biol 2006; 16:198-205. [PMID: 16515861 DOI: 10.1016/j.tcb.2006.02.001] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2005] [Revised: 01/17/2006] [Accepted: 02/16/2006] [Indexed: 11/20/2022]
Abstract
The dystrophin-glycoprotein complex (DGC) can be considered as a specialized adhesion complex, linking the extracellular matrix to the actin cytoskeleton, primarily in muscle cells. Mutations in several components of the DGC lead to its partial or total loss, resulting in various forms of muscular dystrophy. These typically manifest as progressive wasting diseases with loss of muscle integrity. Debate is ongoing about the precise function of the DGC: initially a strictly mechanical role was proposed but it has been suggested that there is aberrant calcium handling in muscular dystrophy and, more recently, changes in MAP kinase and GTPase signalling have been implicated in the aetiology of the disease. Here, we discuss new and interesting developments in these aspects of DGC function and attempt to rationalize the mechanical, calcium and signalling hypotheses to provide a unifying hypothesis of the underlying process of muscular dystrophy.
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Affiliation(s)
- Clare L Batchelor
- Centre for Developmental and Biomedical Genetics, Department of Biomedical Science, University of Sheffield, Western Bank, Sheffield, UK, S10 2TN
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DeBiase PJ, Lane K, Budinger S, Ridge K, Wilson M, Jones JCR. Laminin-311 (Laminin-6) fiber assembly by type I-like alveolar cells. J Histochem Cytochem 2006; 54:665-72. [PMID: 16714422 DOI: 10.1369/jhc.5a6889.2006] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Two epithelial cell types cover the alveolar surface of the lung. Type II alveolar epithelial cells produce surfactant and, during development or following wounding, give rise to type I cells that are involved in gas exchange and alveolar fluid homeostasis. In culture, freshly isolated alveolar type II cells assume a more squamous (type I-like) appearance within 4 days after plating. They assemble numerous focal adhesions that associate with the actin cytoskeleton at the cell margins. These alveolar epithelial cells lose expression of type II cell markers including SP-C and after 4 days in culture express the type I cell marker T1alpha. Those cells that express T1alpha also deposit fibers of laminin-311 in their matrix. The latter appears to be related to their development of a type I phenotype because freshly isolated, primary type I cells also assemble laminin-311-rich fibers in vitro. A beta1 integrin antibody antagonist inhibits the assembly of laminin-311 matrix fibers. Moreover, the formation of laminin fibers is dependent on the activity of the small GTPases and is perturbed by ML-7, a myosin light chain kinase inhibitor. In summary, our data indicate that assembly of laminin-311 fibers by lung epithelial cells is integrin and actin cytoskeleton dependent, and that these fibers are characteristic of type I alveolar cells.
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Affiliation(s)
- Phillip J DeBiase
- Division of Pulmonary Medicine, Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, Tarry 8-715, 303 E. Chicago Avenue, Chicago, IL 60611, USA.
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Kanagawa M, Michele DE, Satz JS, Barresi R, Kusano H, Sasaki T, Timpl R, Henry MD, Campbell KP. Disruption of perlecan binding and matrix assembly by post-translational or genetic disruption of dystroglycan function. FEBS Lett 2005; 579:4792-6. [PMID: 16098969 DOI: 10.1016/j.febslet.2005.07.059] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2005] [Revised: 07/19/2005] [Accepted: 07/25/2005] [Indexed: 01/11/2023]
Abstract
Dystroglycan is a cell-surface matrix receptor that requires LARGE-dependent glycosylation for laminin binding. Although the interaction of dystroglycan with laminin has been well characterized, less is known about the role of dystroglycan glycosylation in the binding and assembly of perlecan. We report reduced perlecan-binding activity and mislocalization of perlecan in the LARGE-deficient Large(myd) mouse. Cell-surface ligand clustering assays show that laminin polymerization promotes perlecan assembly. Solid-phase binding assays provide evidence for the first time of a trimolecular complex formation of dystroglycan, laminin and perlecan. These data suggest functional disruption of the trimolecular complex in glycosylation-deficient muscular dystrophy.
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Affiliation(s)
- Motoi Kanagawa
- Department of Physiology and Biophysics, Howard Hughes Medical Institute, Roy J. and Lucille A. Carver College of Medicine, The University of Iowa, 400 Eckstein Medical Building, Iowa City, IA 52242, USA
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