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Crossman DJ, Jayasinghe ID, Soeller C. Transverse tubule remodelling: a cellular pathology driven by both sides of the plasmalemma? Biophys Rev 2017; 9:919-929. [PMID: 28695473 DOI: 10.1007/s12551-017-0273-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Accepted: 06/06/2017] [Indexed: 01/10/2023] Open
Abstract
Transverse (t)-tubules are invaginations of the plasma membrane that form a complex network of ducts, 200-400 nm in diameter depending on the animal species, that penetrates deep within the cardiac myocyte, where they facilitate a fast and synchronous contraction across the entire cell volume. There is now a large body of evidence in animal models and humans demonstrating that pathological distortion of the t-tubule structure has a causative role in the loss of myocyte contractility that underpins many forms of heart failure. Investigations into the molecular mechanisms of pathological t-tubule remodelling to date have focused on proteins residing in the intracellular aspect of t-tubule membrane that form linkages between the membrane and myocyte cytoskeleton. In this review, we shed light on the mechanisms of t-tubule remodelling which are not limited to the intracellular side. Our recent data have demonstrated that collagen is an integral part of the t-tubule network and that it increases within the tubules in heart failure, suggesting that a fibrotic mechanism could drive cardiac junctional remodelling. We examine the evidence that the linkages between the extracellular matrix, t-tubule membrane and cellular cytoskeleton should be considered as a whole when investigating the mechanisms of t-tubule pathology in the failing heart.
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Affiliation(s)
- David J Crossman
- Department of Physiology, University of Auckland, Auckland, New Zealand.
| | | | - Christian Soeller
- Department of Physiology, University of Auckland, Auckland, New Zealand
- Biomedical Physics, University of Exeter, Exeter, UK
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52
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Integrin α2β1 in nonactivated conformation can induce focal adhesion kinase signaling. Sci Rep 2017; 7:3414. [PMID: 28611383 PMCID: PMC5469853 DOI: 10.1038/s41598-017-03640-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Accepted: 05/02/2017] [Indexed: 12/22/2022] Open
Abstract
Conformational activation of integrins is generally required for ligand binding and cellular signalling. However, we have previously reported that the nonactivated conformation of α2β1 integrin can also bind to large ligands, such as human echovirus 1. In this study, we show that the interaction between the nonactivated integrin and a ligand resulted in the activation of focal adhesion kinase (FAK) in a protein kinase C dependent manner. A loss-of-function mutation, α2E336A, in the α2-integrin did not prevent the activation of FAK, nor did EDTA-mediated inactivation of the integrin. Full FAK activation was observed, since phosphorylation was not only confirmed in residue Y397, but also in residues Y576/7. Furthermore, initiation of downstream signaling by paxillin phosphorylation in residue Y118 was evident, even though this activation was transient by nature, probably due to the lack of talin involvement in FAK activation and the absence of vinculin in the adhesion complexes formed by the nonactivated integrins. Altogether these results indicate that the nonactivated integrins can induce cellular signaling, but the outcome of the signaling differs from conventional integrin signaling.
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53
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Tiraravesit N, Humbert P, Robin S, Tissot M, Viennet C, Viyoch J. Artocarpin-enriched (Artocarpus altilis) Heartwood Extract Provides Protection Against UVB-induced Mechanical Damage in Dermal Fibroblasts. Photochem Photobiol 2017; 93:1232-1239. [PMID: 28477344 DOI: 10.1111/php.12788] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 04/08/2017] [Indexed: 01/06/2023]
Abstract
This study aimed to evaluate the protective effect of artocarpin-enriched (Artocarpus altilis) heartwood extract on the mechanical properties of UVB-irradiated fibroblasts. Human skin fibroblasts were pretreated with 50 μg/mL-1 extract and later irradiated with UVB (200 mJ/cm-2 ). They were then cultured within three-dimensional of free-floating and tense collagen lattices. The pretreatment of fibroblasts with the extract prior to UVB radiation showed cells protection against UVB-induced suppression of α-SMA expression, fibroblast migration and contraction. These results reveal that the extract prevents mechanical damages induced by UVB irradiation in fibroblast-embedded collagen lattices, and therefore, has a potential as a natural photo-protectant.
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Affiliation(s)
- Narisara Tiraravesit
- Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences and Center of Excellence for Innovation in Chemistry, Naresuan University, Phitsanulok, Thailand
| | - Philippe Humbert
- Engineering and Cutaneous Biology Laboratory, UMR 1098, University of Bourgogne Franche-Comte, Besançon, France.,Department of Dermatology, University Hospital, Besançon, France
| | | | - Marion Tissot
- Engineering and Cutaneous Biology Laboratory, UMR 1098, University of Bourgogne Franche-Comte, Besançon, France
| | - Céline Viennet
- Engineering and Cutaneous Biology Laboratory, UMR 1098, University of Bourgogne Franche-Comte, Besançon, France
| | - Jarupa Viyoch
- Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences and Center of Excellence for Innovation in Chemistry, Naresuan University, Phitsanulok, Thailand
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54
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Godwin ARF, Starborg T, Sherratt MJ, Roseman AM, Baldock C. Defining the hierarchical organisation of collagen VI microfibrils at nanometre to micrometre length scales. Acta Biomater 2017; 52:21-32. [PMID: 27956360 PMCID: PMC5402720 DOI: 10.1016/j.actbio.2016.12.023] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Revised: 11/06/2016] [Accepted: 12/08/2016] [Indexed: 12/27/2022]
Abstract
Extracellular matrix microfibrils are critical components of connective tissues with a wide range of mechanical and cellular signalling functions. Collagen VI is a heteromeric network-forming collagen which is expressed in tissues such as skin, lung, blood vessels and articular cartilage where it anchors cells into the matrix allowing for transduction of biochemical and mechanical signals. It is not understood how collagen VI is arranged into microfibrils or how these microfibrils are arranged into tissues. Therefore we have characterised the hierarchical organisation of collagen VI across multiple length scales. The frozen hydrated nanostructure of purified collagen VI microfibrils was reconstructed using cryo-TEM. The bead region has a compact hollow head and flexible tail regions linked by the collagenous interbead region. Serial block face SEM imaging coupled with electron tomography of the pericellular matrix (PCM) of murine articular cartilage revealed that the PCM has a meshwork-like organisation formed from globular densities ∼30nm in diameter. These approaches can characterise structures spanning nanometer to millimeter length scales to define the nanostructure of individual collagen VI microfibrils and the micro-structural organisation of these fibrils within tissues to help in the future design of better mimetics for tissue engineering. STATEMENT OF SIGNIFICANCE Cartilage is a connective tissue rich in extracellular matrix molecules and is tough and compressive to cushion the bones of joints. However, in adults cartilage is poorly repaired after injury and so this is an important target for tissue engineering. Many connective tissues contain collagen VI, which forms microfibrils and networks but we understand very little about these assemblies or the tissue structures they form. Therefore, we have use complementary imaging techniques to image collagen VI microfibrils from the nano-scale to the micro-scale in order to understand the structure and the assemblies it forms. These findings will help to inform the future design of scaffolds to mimic connective tissues in regenerative medicine applications.
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Affiliation(s)
- Alan R F Godwin
- Wellcome Centre for Cell-Matrix Research, Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT, UK
| | - Tobias Starborg
- Wellcome Centre for Cell-Matrix Research, Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT, UK
| | - Michael J Sherratt
- School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT, UK
| | - Alan M Roseman
- School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT, UK
| | - Clair Baldock
- Wellcome Centre for Cell-Matrix Research, Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT, UK.
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55
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Zhang J, Schwartz MP, Hou Z, Bai Y, Ardalani H, Swanson S, Steill J, Ruotti V, Elwell A, Nguyen BK, Bolin J, Stewart R, Thomson JA, Murphy WL. A Genome-wide Analysis of Human Pluripotent Stem Cell-Derived Endothelial Cells in 2D or 3D Culture. Stem Cell Reports 2017; 8:907-918. [PMID: 28343999 PMCID: PMC5390115 DOI: 10.1016/j.stemcr.2017.02.014] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Revised: 02/15/2017] [Accepted: 02/16/2017] [Indexed: 02/07/2023] Open
Abstract
A defined protocol for efficiently deriving endothelial cells from human pluripotent stem cells was established and vascular morphogenesis was used as a model system to understand how synthetic hydrogels influence global biological function compared with common 2D and 3D culture platforms. RNA sequencing demonstrated that gene expression profiles were similar for endothelial cells and pericytes cocultured in polyethylene glycol (PEG) hydrogels or Matrigel, while monoculture comparisons identified distinct vascular signatures for each cell type. Endothelial cells cultured on tissue-culture polystyrene adopted a proliferative phenotype compared with cells cultured on or encapsulated in PEG hydrogels. The proliferative phenotype correlated to increased FAK-ERK activity, and knockdown or inhibition of ERK signaling reduced proliferation and expression for cell-cycle genes while increasing expression for “3D-like” vasculature development genes. Our results provide insight into the influence of 2D and 3D culture formats on global biological processes that regulate cell function. Defined, high-efficiency differentiation of human PSCs to endothelial cell Comprehensive genome-wide comparisons of 2D and 3D cell-culture formats Gene expression profiles for endothelial cells and pericytes in 3D cell culture Highly proliferative phenotypes on tissue-culture polystyrene surfaces
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Affiliation(s)
- Jue Zhang
- Regenerative Biology, Morgridge Institute for Research, Madison, WI 53715, USA
| | - Michael P Schwartz
- Department of Biomedical Engineering, University of Wisconsin-Madison, Wisconsin Institute for Medical Research, Room 5405, Madison, WI 53706, USA.
| | - Zhonggang Hou
- Regenerative Biology, Morgridge Institute for Research, Madison, WI 53715, USA
| | - Yongsheng Bai
- Regenerative Biology, Morgridge Institute for Research, Madison, WI 53715, USA
| | - Hamisha Ardalani
- Department of Biomedical Engineering, University of Wisconsin-Madison, Wisconsin Institute for Medical Research, Room 5405, Madison, WI 53706, USA
| | - Scott Swanson
- Regenerative Biology, Morgridge Institute for Research, Madison, WI 53715, USA
| | - John Steill
- Regenerative Biology, Morgridge Institute for Research, Madison, WI 53715, USA
| | - Victor Ruotti
- Regenerative Biology, Morgridge Institute for Research, Madison, WI 53715, USA
| | - Angela Elwell
- Regenerative Biology, Morgridge Institute for Research, Madison, WI 53715, USA
| | - Bao Kim Nguyen
- Regenerative Biology, Morgridge Institute for Research, Madison, WI 53715, USA
| | - Jennifer Bolin
- Regenerative Biology, Morgridge Institute for Research, Madison, WI 53715, USA
| | - Ron Stewart
- Regenerative Biology, Morgridge Institute for Research, Madison, WI 53715, USA
| | - James A Thomson
- Regenerative Biology, Morgridge Institute for Research, Madison, WI 53715, USA; Department of Cell & Regenerative Biology, University of Wisconsin-Madison, Madison, WI 53705, USA; Department of Molecular, Cellular, & Developmental Biology, University of California, Santa Barbara, CA 93117, USA
| | - William L Murphy
- Department of Biomedical Engineering, University of Wisconsin-Madison, Wisconsin Institute for Medical Research, Room 5405, Madison, WI 53706, USA; Materials Science Program, University of Wisconsin-Madison, Madison, WI 53706, USA; Department of Orthopedics and Rehabilitation, University of Wisconsin-Madison, Madison, WI 53705, USA.
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56
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Woltersdorf C, Bonk M, Leitinger B, Huhtala M, Käpylä J, Heino J, Gil Girol C, Niland S, Eble JA, Bruckner P, Dreier R, Hansen U. The binding capacity of α1β1-, α2β1- and α10β1-integrins depends on non-collagenous surface macromolecules rather than the collagens in cartilage fibrils. Matrix Biol 2017; 63:91-105. [PMID: 28192200 DOI: 10.1016/j.matbio.2017.02.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Revised: 02/03/2017] [Accepted: 02/04/2017] [Indexed: 12/30/2022]
Abstract
Interactions of cells with supramolecular aggregates of the extracellular matrix (ECM) are mediated, in part, by cell surface receptors of the integrin family. These are important molecular components of cell surface-suprastructures regulating cellular activities in general. A subfamily of β1-integrins with von Willebrand-factor A-like domains (I-domains) in their α-chains can bind to collagen molecules and, therefore, are considered as important cellular mechano-receptors. Here we show that chondrocytes strongly bind to cartilage collagens in the form of individual triple helical molecules but very weakly to fibrils formed by the same molecules. We also find that chondrocyte integrins α1β1-, α2β1- and α10β1-integrins and their I-domains have the same characteristics. Nevertheless we find integrin binding to mechanically generated cartilage fibril fragments, which also comprise peripheral non-collagenous material. We conclude that cell adhesion results from binding of integrin-containing adhesion suprastructures to the non-collagenous fibril periphery but not to the collagenous fibril cores. The biological importance of the well-investigated recognition of collagen molecules by integrins is unknown. Possible scenarios may include fibrillogenesis, fibril degradation and/or phagocytosis, recruitment of cells to remodeling sites, or molecular signaling across cytoplasmic membranes. In these circumstances, collagen molecules may lack a fibrillar organization. However, other processes requiring robust biomechanical functions, such as fibril organization in tissues, cell division, adhesion, or migration, do not involve direct integrin-collagen interactions.
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Affiliation(s)
- Christian Woltersdorf
- Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, D-48149 Münster, Germany
| | - Melanie Bonk
- Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, D-48149 Münster, Germany
| | - Birgit Leitinger
- National Heart and Lung Institute, Imperial College London, London SW7 2AZ, UK
| | - Mikko Huhtala
- University of Turku, Department of Biochemistry, FI-20014 Turun Yliopisto, Finland
| | - Jarmo Käpylä
- University of Turku, Department of Biochemistry, FI-20014 Turun Yliopisto, Finland
| | - Jyrki Heino
- University of Turku, Department of Biochemistry, FI-20014 Turun Yliopisto, Finland
| | - Christian Gil Girol
- Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, D-48149 Münster, Germany
| | - Stephan Niland
- Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, D-48149 Münster, Germany
| | - Johannes A Eble
- Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, D-48149 Münster, Germany
| | - Peter Bruckner
- Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, D-48149 Münster, Germany.
| | - Rita Dreier
- Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, D-48149 Münster, Germany
| | - Uwe Hansen
- Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, D-48149 Münster, Germany; Institute of Experimental Musculoskeletal Medicine (IEMM), University of Münster, DE-48149 Münster, Germany
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57
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Kohara Y, Soeta S, Izu Y, Arai K, Amasaki H. Distribution of type VI collagen in association with osteoblast lineages in the groove of Ranvier during rat postnatal development. Ann Anat 2016; 208:58-68. [DOI: 10.1016/j.aanat.2016.07.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Revised: 06/18/2016] [Accepted: 07/06/2016] [Indexed: 01/29/2023]
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58
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Ben Shoham A, Rot C, Stern T, Krief S, Akiva A, Dadosh T, Sabany H, Lu Y, Kadler KE, Zelzer E. Deposition of collagen type I onto skeletal endothelium reveals a new role for blood vessels in regulating bone morphology. Development 2016; 143:3933-3943. [PMID: 27621060 PMCID: PMC5117144 DOI: 10.1242/dev.139253] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Accepted: 08/30/2016] [Indexed: 12/30/2022]
Abstract
Recently, blood vessels have been implicated in the morphogenesis of various organs. The vasculature is also known to be essential for endochondral bone development, yet the underlying mechanism has remained elusive. We show that a unique composition of blood vessels facilitates the role of the endothelium in bone mineralization and morphogenesis. Immunostaining and electron microscopy showed that the endothelium in developing bones lacks basement membrane, which normally isolates the blood vessel from its surroundings. Further analysis revealed the presence of collagen type I on the endothelial wall of these vessels. Because collagen type I is the main component of the osteoid, we hypothesized that the bone vasculature guides the formation of the collagenous template and consequently of the mature bone. Indeed, some of the bone vessels were found to undergo mineralization. Moreover, the vascular pattern at each embryonic stage prefigured the mineral distribution pattern observed one day later. Finally, perturbation of vascular patterning by overexpressing Vegf in osteoblasts resulted in abnormal bone morphology, supporting a role for blood vessels in bone morphogenesis. These data reveal the unique composition of the endothelium in developing bones and indicate that vascular patterning plays a role in determining bone shape by forming a template for deposition of bone matrix. Highlighted article: Collagen I is deposited by osteoblasts onto endothelial cells within bone and serves as a template for mineralisation, with ossification thus spatially and temporally following vascular patterning.
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Affiliation(s)
- Adi Ben Shoham
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Chagai Rot
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Tomer Stern
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Sharon Krief
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Anat Akiva
- Department of Structural Biology, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Tali Dadosh
- Irving and Cherna Moskowitz Center for Nano and Bio-Nano Imaging, Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Helena Sabany
- Irving and Cherna Moskowitz Center for Nano and Bio-Nano Imaging, Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Yinhui Lu
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PT, UK
| | - Karl E Kadler
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PT, UK
| | - Elazar Zelzer
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel
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59
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Hamaia SW, Luff D, Hunter EJ, Malcor JD, Bihan D, Gullberg D, Farndale RW. Unique charge-dependent constraint on collagen recognition by integrin α10β1. Matrix Biol 2016; 59:80-94. [PMID: 27569273 PMCID: PMC5380659 DOI: 10.1016/j.matbio.2016.08.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Revised: 08/19/2016] [Accepted: 08/19/2016] [Indexed: 12/27/2022]
Abstract
The collagen-binding integrins recognise collagen through their inserted (I) domain, where co-ordination of a Mg2 + ion in the metal ion-dependent site is reorganised by ligation by a collagen glutamate residue found in specific collagen hexapeptide motifs. Here we show that GROGER, found in the N-terminal domain of collagens I and III, is only weakly recognised by α10β1, an important collagen receptor on chondrocytes, contrasting with the other collagen-binding integrins. Alignment of I domain sequence and molecular modelling revealed a clash between a unique arginine residue (R215) in α10β1 and the positively-charged GROGER. Replacement of R215 with glutamine restored binding. Substituting arginine at the equivalent locus (Q214) in integrins α1 and α2 I domains impaired their binding to GROGER. Collagen II, abundant in cartilage, lacks GROGER. GRSGET is uniquely expressed in the C-terminus of collagen II, but this motif is similarly not recognised by α10β1. These data suggest an evolutionary imperative to maintain accessibility of the terminal domains of collagen II in tissues such as cartilage, perhaps during endochondral ossification, where α10β1 is the main collagen-binding integrin. Integrin α10β1 binding to collagen is mapped onto Collagen Toolkits. Charged residue in α10 I domain clashes with some binding sites that are unique to collagen II. Mutant constructs of other integrin I domains mimic this charge effect. Implications for evolution of collagens and cartilage with reference to bone formation
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Affiliation(s)
- Samir W Hamaia
- Department of Biochemistry, University of Cambridge, Downing Site, Cambridge CB2 1QW, UK
| | - Daisy Luff
- Department of Biochemistry, University of Cambridge, Downing Site, Cambridge CB2 1QW, UK
| | - Emma J Hunter
- Department of Biochemistry, University of Cambridge, Downing Site, Cambridge CB2 1QW, UK
| | - Jean-Daniel Malcor
- Department of Biochemistry, University of Cambridge, Downing Site, Cambridge CB2 1QW, UK
| | - Dominique Bihan
- Department of Biochemistry, University of Cambridge, Downing Site, Cambridge CB2 1QW, UK
| | - Donald Gullberg
- Department of Biomedicine, University of Bergen, Jonas Lies vei 91, N-5009 Bergen, Norway
| | - Richard W Farndale
- Department of Biochemistry, University of Cambridge, Downing Site, Cambridge CB2 1QW, UK.
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60
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Loscertales M, Nicolaou F, Jeanne M, Longoni M, Gould DB, Sun Y, Maalouf FI, Nagy N, Donahoe PK. Type IV collagen drives alveolar epithelial-endothelial association and the morphogenetic movements of septation. BMC Biol 2016; 14:59. [PMID: 27412481 PMCID: PMC4942891 DOI: 10.1186/s12915-016-0281-2] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 07/01/2016] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Type IV collagen is the main component of the basement membrane that gives strength to the blood-gas barrier (BGB). In mammals, the formation of a mature BGB occurs primarily after birth during alveologenesis and requires the formation of septa from the walls of the saccule. In contrast, in avians, the formation of the BGB occurs rapidly and prior to hatching. Mutation in basement membrane components results in an abnormal alveolar phenotype; however, the specific role of type IV collagen in regulating alveologenesis remains unknown. RESULTS We have performed a microarray expression analysis in late chick lung development and found that COL4A1 and COL4A2 were among the most significantly upregulated genes during the formation of the avian BGB. Using mouse models, we discovered that mutations in murine Col4a1 and Col4a2 genes affected the balance between lung epithelial progenitors and differentiated cells. Mutations in Col4a1 derived from the vascular component were sufficient to cause defects in vascular development and the BGB. We also show that Col4a1 and Col4a2 mutants displayed disrupted myofibroblast proliferation, differentiation and migration. Lastly, we revealed that addition of type IV collagen protein induced myofibroblast proliferation and migration in monolayer culture and increased the formation of mesenchymal-epithelial septal-like structures in co-culture. CONCLUSIONS Our study showed that type IV collagen and, therefore the basement membrane, play fundamental roles in coordinating alveolar morphogenesis. In addition to its role in the formation of epithelium and vasculature, type IV collagen appears to be key for alveolar myofibroblast development by inducing their proliferation, differentiation and migration throughout the developing septum.
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Affiliation(s)
- Maria Loscertales
- The Pediatric Surgical Research Laboratories, Massachusetts General Hospital, Boston, MA, 02114, USA.
- Department of Surgery, Harvard Medical School, Boston, MA, 02115, USA.
| | - Fotini Nicolaou
- The Pediatric Surgical Research Laboratories, Massachusetts General Hospital, Boston, MA, 02114, USA
| | - Marion Jeanne
- Departments of Ophthalmology and Anatomy, Institute for Human Genetics, University of California, San Francisco, School of Medicine, San Francisco, CA, 94143, USA
| | - Mauro Longoni
- The Pediatric Surgical Research Laboratories, Massachusetts General Hospital, Boston, MA, 02114, USA
- Department of Surgery, Harvard Medical School, Boston, MA, 02115, USA
| | - Douglas B Gould
- Departments of Ophthalmology and Anatomy, Institute for Human Genetics, University of California, San Francisco, School of Medicine, San Francisco, CA, 94143, USA
| | - Yunwei Sun
- The Pediatric Surgical Research Laboratories, Massachusetts General Hospital, Boston, MA, 02114, USA
| | - Faouzi I Maalouf
- The Pediatric Surgical Research Laboratories, Massachusetts General Hospital, Boston, MA, 02114, USA
| | - Nandor Nagy
- The Pediatric Surgical Research Laboratories, Massachusetts General Hospital, Boston, MA, 02114, USA
- Department of Surgery, Harvard Medical School, Boston, MA, 02115, USA
- Department of Human Anatomy, Histology and Embryology, Faculty of Medicine, Semmelweis University, Budapest, 1094, Hungary
| | - Patricia K Donahoe
- The Pediatric Surgical Research Laboratories, Massachusetts General Hospital, Boston, MA, 02114, USA
- Department of Surgery, Harvard Medical School, Boston, MA, 02115, USA
- Broad Institute of MIT and Harvard, Cambridge, MA, 02142, USA
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61
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Zanotelli MR, Ardalani H, Zhang J, Hou Z, Nguyen EH, Swanson S, Nguyen BK, Bolin J, Elwell A, Bischel LL, Xie AW, Stewart R, Beebe DJ, Thomson JA, Schwartz MP, Murphy WL. Stable engineered vascular networks from human induced pluripotent stem cell-derived endothelial cells cultured in synthetic hydrogels. Acta Biomater 2016; 35:32-41. [PMID: 26945632 PMCID: PMC4829480 DOI: 10.1016/j.actbio.2016.03.001] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 02/28/2016] [Accepted: 03/01/2016] [Indexed: 02/08/2023]
Abstract
Here, we describe an in vitro strategy to model vascular morphogenesis where human induced pluripotent stem cell-derived endothelial cells (iPSC-ECs) are encapsulated in peptide-functionalized poly(ethylene glycol) (PEG) hydrogels, either on standard well plates or within a passive pumping polydimethylsiloxane (PDMS) tri-channel microfluidic device. PEG hydrogels permissive towards cellular remodeling were fabricated using thiol-ene photopolymerization to incorporate matrix metalloproteinase (MMP)-degradable crosslinks and CRGDS cell adhesion peptide. Time lapse microscopy, immunofluorescence imaging, and RNA sequencing (RNA-Seq) demonstrated that iPSC-ECs formed vascular networks through mechanisms that were consistent with in vivo vasculogenesis and angiogenesis when cultured in PEG hydrogels. Migrating iPSC-ECs condensed into clusters, elongated into tubules, and formed polygonal networks through sprouting. Genes upregulated for iPSC-ECs cultured in PEG hydrogels relative to control cells on tissue culture polystyrene (TCP) surfaces included adhesion, matrix remodeling, and Notch signaling pathway genes relevant to in vivo vascular development. Vascular networks with lumens were stable for at least 14days when iPSC-ECs were encapsulated in PEG hydrogels that were polymerized within the central channel of the microfluidic device. Therefore, iPSC-ECs cultured in peptide-functionalized PEG hydrogels offer a defined platform for investigating vascular morphogenesis in vitro using both standard and microfluidic formats. STATEMENT OF SIGNIFICANCE Human induced pluripotent stem cell-derived endothelial cells (iPSC-ECs) cultured in synthetic hydrogels self-assemble into capillary networks through mechanisms consistent with in vivo vascular morphogenesis.
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Affiliation(s)
- Matthew R Zanotelli
- Department of Biomedical Engineering, University of Wisconsin-Madison, WI, USA
| | - Hamisha Ardalani
- Department of Biomedical Engineering, University of Wisconsin-Madison, WI, USA
| | - Jue Zhang
- Morgridge Institute for Research, Madison, WI, USA
| | | | - Eric H Nguyen
- Department of Biomedical Engineering, University of Wisconsin-Madison, WI, USA
| | | | | | | | | | - Lauren L Bischel
- Department of Biomedical Engineering, University of Wisconsin-Madison, WI, USA
| | - Angela W Xie
- Department of Biomedical Engineering, University of Wisconsin-Madison, WI, USA
| | - Ron Stewart
- Morgridge Institute for Research, Madison, WI, USA
| | - David J Beebe
- Department of Biomedical Engineering, University of Wisconsin-Madison, WI, USA
| | - James A Thomson
- Morgridge Institute for Research, Madison, WI, USA; Department of Cell and Regenerative Biology, University of Wisconsin-Madison, WI, USA; Department of Molecular, Cellular, and Developmental Biology, University of California-Santa Barbara, CA, USA
| | - Michael P Schwartz
- Department of Biomedical Engineering, University of Wisconsin-Madison, WI, USA.
| | - William L Murphy
- Department of Biomedical Engineering, University of Wisconsin-Madison, WI, USA; Department of Orthopedics and Rehabilitation, University of Wisconsin-Madison, WI, USA.
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Jiang L, Sun Z, Chen X, Li J, Xu Y, Zu Y, Hu J, Han D, Yang C. Cells Sensing Mechanical Cues: Stiffness Influences the Lifetime of Cell-Extracellular Matrix Interactions by Affecting the Loading Rate. ACS NANO 2016; 10:207-17. [PMID: 26701367 DOI: 10.1021/acsnano.5b03157] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The question of how cells sense substrate mechanical cues has gained increasing attention among biologists. By introducing contour-based data analysis to single-cell force spectroscopy, we identified a loading-rate threshold for the integrin α2β1-DGEA bond beyond which a dramatic increase in bond lifetime was observed. On the basis of mechanical cues (elasticity or topography), the effective spring constant of substrates k is mapped to the loading rate r under actomyosin pulling speed v, which, in turn, affects the lifetime of the integrin-ligand bond. Additionally, downregulating v with a low-dose blebbistatin treatment promotes the neuronal lineage specification of mesenchymal stem cells on osteogenic stiff substrates. Thus, sensing of the loading rate is central to how cells sense mechanical cues that affect cell-extracellular matrix interactions and stem cell differentiation.
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Affiliation(s)
- Li Jiang
- Institute of Biomechanics and Medical Engineering, School of Aerospace, Tsinghua University , Beijing 100084, People's Republic of China
| | - Zhenglong Sun
- Institute of Biomechanics and Medical Engineering, School of Aerospace, Tsinghua University , Beijing 100084, People's Republic of China
- Suzhou Institute of Biomedical Engineering and Technology, China Academy of Science , Suzhou 215163, People's Republic of China
| | - Xiaofei Chen
- Institute of Biomechanics and Medical Engineering, School of Aerospace, Tsinghua University , Beijing 100084, People's Republic of China
- Beijing Institute of Aerospace Systems Engineering , Beijing 100076, People's Republic of China
| | - Jing Li
- Institute of Biomechanics and Medical Engineering, School of Aerospace, Tsinghua University , Beijing 100084, People's Republic of China
| | - Yue Xu
- Institute of Biomechanics and Medical Engineering, School of Aerospace, Tsinghua University , Beijing 100084, People's Republic of China
| | - Yan Zu
- Institute of Biomechanics and Medical Engineering, School of Aerospace, Tsinghua University , Beijing 100084, People's Republic of China
| | - Jiliang Hu
- Institute of Biomechanics and Medical Engineering, School of Aerospace, Tsinghua University , Beijing 100084, People's Republic of China
| | - Dong Han
- National Center for Nanoscience and Technology , Beijing 100190, People's Republic of China
| | - Chun Yang
- Institute of Biomechanics and Medical Engineering, School of Aerospace, Tsinghua University , Beijing 100084, People's Republic of China
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63
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Zhou Z, Pausch F, Schlötzer-Schrehardt U, Brachvogel B, Pöschl E. Induction of initial steps of angiogenic differentiation and maturation of endothelial cells by pericytes in vitro and the role of collagen IV. Histochem Cell Biol 2016; 145:511-25. [PMID: 26747274 DOI: 10.1007/s00418-015-1398-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/17/2015] [Indexed: 12/31/2022]
Abstract
Activation of endothelial cells and recruitment of mural cells define critical steps during the formation of stable vascular elements. Both events are reflected by cocultures of endothelial cells and isolated murine pericyte-like cells and define a versatile platform for the analysis of distinct steps during the angiogenic process in vitro. Isolated pericyte-like cells promote the survival of endothelial cells, induce the assembly of endothelial cells as well as establish direct contacts with forming endothelial alignments. More importantly, they also induce characteristic steps of maturation including the assembly of stable cell-cell junctions, deposition of basement membrane-like matrices and local formation of a central lumen. The presence of pericyte-like cells induces the secretion of extracellular matrices enriched in collagen IV by endothelial cells, which improves endothelial tube formation and provides the adhesive substrate for mural cell recruitment. Collagen-binding integrins contribute differentially to the process, with α1β1 involved in the adhesion of pericyte-like cells to collagen IV and α2β1 mainly involved in endothelial cord formation. These data indicate that pericyte-like cells are essential for the survival of endothelial cells, the efficient formation of endothelial alignments as well as initial steps of maturation of capillary-like structures.
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Affiliation(s)
- Zhigang Zhou
- Biomedical Research Centre, School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK
- Medical School, University of East Anglia, Norwich Research Park, Norwich, UK
- Department of Cardiovascular Medicine, Medical College, Nantong University, Nantong, China
| | - Friederike Pausch
- Department of Experimental Medicine I, University of Erlangen-Nürnberg, Erlangen, Germany
| | | | - Bent Brachvogel
- Medical Faculty, Center for Biochemistry, University of Cologne, Cologne, Germany
| | - Ernst Pöschl
- Biomedical Research Centre, School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK.
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64
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Yannas IV, Tzeranis D, So PT. Surface biology of collagen scaffold explains blocking of wound contraction and regeneration of skin and peripheral nerves. Biomed Mater 2015; 11:014106. [PMID: 26694657 PMCID: PMC5775477 DOI: 10.1088/1748-6041/11/1/014106] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
We review the details of preparation and of the recently elucidated mechanism of biological (regenerative) activity of a collagen scaffold (dermis regeneration template, DRT) that has induced regeneration of skin and peripheral nerves (PN) in a variety of animal models and in the clinic. DRT is a 3D protein network with optimized pore size in the range 20-125 µm, degradation half-life 14 ± 7 d and ligand densities that exceed 200 µM α1β1 or α2β1 ligands. The pore has been optimized to allow migration of contractile cells (myofibroblasts, MFB) into the scaffold and to provide sufficient specific surface for cell-scaffold interaction; the degradation half-life provides the required time window for satisfactory binding interaction of MFB with the scaffold surface; and the ligand density supplies the appropriate ligands for specific binding of MFB on the scaffold surface. A dramatic change in MFB phenotype takes place following MFB-scaffold binding which has been shown to result in blocking of wound contraction. In both skin wounds and PN wounds the evidence has shown clearly that contraction blocking by DRT is followed by induction of regeneration of nearly perfect organs. The biologically active structure of DRT is required for contraction blocking; well-matched collagen scaffold controls of DRT, with structures that varied from that of DRT, have failed to induce regeneration. Careful processing of collagen scaffolds is required for adequate biological activity of the scaffold surface. The newly understood mechanism provides a relatively complete paradigm of regenerative medicine that can be used to prepare scaffolds that may induce regeneration of other organs in future studies.
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Affiliation(s)
- I V Yannas
- Departments of Mechanical and Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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65
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Rader EP, Layner KN, Triscuit AM, Kashon ML, Gu JK, Ensey J, Baker BA. Desensitized morphological and cytokine response after stretch-shortening muscle contractions as a feature of aging in rats. Exp Gerontol 2015; 72:138-49. [PMID: 26454037 DOI: 10.1016/j.exger.2015.09.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 09/14/2015] [Accepted: 09/29/2015] [Indexed: 12/22/2022]
Abstract
Recovery from contraction-induced injury is impaired with aging. At a young age, the secondary response several days following contraction-induced injury consists of edema, inflammatory cell infiltration, and segmental muscle fiber degeneration to aid in the clearance of damaged tissue and repair. This morphological response has not been wholly established at advanced age. Our aim was to characterize muscle fiber morphology 3 and 10 days following stretch-shortening contractions (SSCs) varying in repetition number (i.e. 0, 30, 80, and 150) for young and old rats. For muscles of young rats, muscle fiber degeneration was overt at 3 days exclusively after 80 or 150 SSCs and returned significantly closer to control values by 10 days. For muscles of old rats, no such responses were observed. Transcriptional microarray analysis at 3 days demonstrated that muscles of young rats differentially expressed up to 2144 genes while muscles of old rats differentially expressed 47 genes. Bioinformatic analysis indicated that cellular movement was a major biological process over-represented with genes that were significantly altered by SSCs especially for young rats. Protein levels in muscle for various cytokines and chemokines, key inflammatory factors for cell movement, increased 3- to 50-fold following high-repetition SSCs for young rats with no change for old rats. This age-related differential response was insightful given that for control (i.e. 0 SSCs) conditions, protein levels of circulatory cytokines/chemokines were increased with age. The results demonstrate ongoing systemic low-grade inflammatory signaling and subsequent desensitization of the cytokine/chemokine and morphological response to contraction-induced injury with aging - features which accompany age-related impairment in muscle recovery.
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Affiliation(s)
- Erik P Rader
- Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Morgantown, WV 26505, United States.
| | - Kayla N Layner
- Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Morgantown, WV 26505, United States.
| | - Alyssa M Triscuit
- Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Morgantown, WV 26505, United States.
| | - Michael L Kashon
- Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Morgantown, WV 26505, United States.
| | - Ja K Gu
- Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Morgantown, WV 26505, United States.
| | - James Ensey
- Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Morgantown, WV 26505, United States.
| | - Brent A Baker
- Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Morgantown, WV 26505, United States.
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66
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Tucker RP, Chiquet-Ehrismann R. Tenascin-C: Its functions as an integrin ligand. Int J Biochem Cell Biol 2015; 65:165-8. [PMID: 26055518 DOI: 10.1016/j.biocel.2015.06.003] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 05/19/2015] [Accepted: 06/01/2015] [Indexed: 01/28/2023]
Abstract
This review summarizes the experimental evidence of tenascin-C/integrin interactions, emphasizing the identification of integrin binding sites and the effects of specific interactions on cell behavior. At least four integrins appear to bind to the third fibronectin-type 3 domain of tenascin-C: α9β1, αVβ3, α8β1 and αVβ6. The α9β1 integrin recognizes a highly conserved IDG motif in this domain, while the others recognize an RGD motif. There is also significant evidence that the collagen receptor α2β1 can bind to tenascin-C, but the interacting site is unknown. Tenascin-C interactions with α9β1 and αVβ3 can promote cell proliferation and interactions with αVβ3 can also inhibit apoptosis. Interactions with α7β1 integrin, which may bind to the alternatively spliced domain of tenascin-C, and α9β1 integrin are able to influence the differentiation of mesenchymal stem cells into the neuronal lineage. This illustrates the potential for using our knowledge of tenascins and their integrin receptors in stem cell-based therapies.
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Affiliation(s)
- Richard P Tucker
- Department of Cell Biology and Human Anatomy, University of California at Davis, 1 Shields Avenue, Davis, CA 95616, USA.
| | - Ruth Chiquet-Ehrismann
- Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel, Switzerland; Faculty of Science, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland
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67
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Sobers CJ, Wood SE, Mrksich M. A gene expression-based comparison of cell adhesion to extracellular matrix and RGD-terminated monolayers. Biomaterials 2015; 52:385-94. [PMID: 25818445 PMCID: PMC4379455 DOI: 10.1016/j.biomaterials.2015.02.045] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 02/03/2015] [Accepted: 02/06/2015] [Indexed: 01/08/2023]
Abstract
This work uses global gene expression analysis to compare the extent to which model substrates presenting peptide adhesion motifs mimic the use of conventional extracellular matrix protein coated substrates for cell culture. We compared the transcriptional activities of genes in cells that were cultured on matrix-coated substrates with those cultured on self-assembled monolayers presenting either a linear or cyclic RGD peptide. Cells adherent to cyclic RGD were most similar to those cultured on native ECM, while cells cultured on monolayers presenting the linear RGD peptide had transcriptional activities that were more similar to cells cultured on the uncoated substrates. This study suggests that biomaterials presenting the cyclic RGD peptide are substantially better mimics of extracellular matrix than are uncoated materials or materials presenting the common linear RGD peptide.
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Affiliation(s)
- Courtney J Sobers
- Department of Chemistry, Northwestern University, Evanston, IL 60208, USA; Department of Cell and Molecular Biology, Northwestern University, Chicago, IL 60611, USA
| | - Sarah E Wood
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Milan Mrksich
- Department of Chemistry, Northwestern University, Evanston, IL 60208, USA; Department of Cell and Molecular Biology, Northwestern University, Chicago, IL 60611, USA; Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA.
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68
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Kohara Y, Soeta S, Izu Y, Amasaki H. Accumulation of type VI collagen in the primary osteon of the rat femur during postnatal development. J Anat 2015; 226:478-88. [PMID: 25943007 DOI: 10.1111/joa.12296] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/13/2015] [Indexed: 12/17/2022] Open
Abstract
In rodents, the long bone diaphysis is expanded by forming primary osteons at the periosteal surface of the cortical bone. This ossification process is thought to be regulated by the microenvironment in the periosteum. Type VI collagen (Col VI), a component of the extracellular matrix (ECM) in the periosteum, is involved in osteoblast differentiation at early stages. In several cell types, Col VI interacts with NG2 on the cytoplasmic membrane to promote cell proliferation, spreading and motility. However, the detailed functions of Col VI and NG2 in the ossification process in the periosteum are still under investigation. In this study, to clarify the relationship between localization of Col VI and formation of the primary osteon, we examined the distribution of Col VI and osteoblast lineages expressing NG2 in the periosteum of rat femoral diaphysis during postnatal growing periods by immunohistochemistry. Primary osteons enclosing the osteonal cavity were clearly identified in the cortical bone from 2 weeks old. The size of the osteonal cavities decreased from the outer to the inner region of the cortical bone. In addition, the osteonal cavities of newly formed primary osteons at the outermost region started to decrease in size after rats reached the age of 4 weeks. Immunohistochemistry revealed concentrated localization of Col VI in the ECM in the osteonal cavity. Col VI-immunoreactive areas were reduced and they disappeared as the osteonal cavities became smaller from the outer to the inner region. In the osteonal cavities of the outer cortical regions, Runx2-immunoreactive spindle-shaped cells and mature osteoblasts were detected in Col VI-immunoreactive areas. The numbers of Runx2-immunoreactive cells were significantly higher in the osteonal cavities than in the osteogenic layers from 2 to 4 weeks. Most of these Runx2-immunoreactive cells showed NG2-immunoreactivity. Furthermore, PCNA-immunoreactivity was detected in the Runx2-immunoreactive spindle cells in the osteonal cavities. These results indicate that Col VI provides a characteristic microenvironment in the osteonal cavity of the primary osteon, and that differentiation and proliferation of the osteoblast lineage occur in the Col VI-immunoreactive area. Interaction of Col VI and NG2 may be involved in the structural organization of the primary osteon by regulating osteoblast lineages.
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Affiliation(s)
- Yukihiro Kohara
- Laboratory of Veterinary Anatomy, Nippon Veterinary and Life Science University, Tokyo, Japan
| | - Satoshi Soeta
- Laboratory of Veterinary Anatomy, Nippon Veterinary and Life Science University, Tokyo, Japan
| | - Yayoi Izu
- Department of Molecular Pharmacology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan
| | - Hajime Amasaki
- Laboratory of Veterinary Anatomy, Nippon Veterinary and Life Science University, Tokyo, Japan
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69
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Xin W, Heilig J, Paulsson M, Zaucke F. Collagen II regulates chondroycte integrin expression profile and differentiation. Connect Tissue Res 2015; 56:307-14. [PMID: 25803621 DOI: 10.3109/03008207.2015.1026965] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Collagen II is the major fibril-forming collagen in cartilage. Complete absence of collagen II in mice is not compatible with life and in humans mutations in the COL2A1 gene lead to osteochondrodysplasias with diverse phenotypes. However, mechanistic studies on how chondrocytes respond to a lack of collagen II in their extracellular matrix are limited. Primary mouse chondrocytes were isolated from knee joints of newborn mice and transfected with siRNA targeting Col2α1 to suppress collagen II expression. The expression of integrin receptors and matrix proteins was investigated by RT-PCR and immunoblots. The localization of matrix components was evaluated by immunostaining. Signaling pathways and the differentiation state of chondrocytes was monitored by RT-PCR and flow cytometry. We demonstrate that in the absence of collagen II chondrocytes start to produce collagen I. Some binding partners of collagen II are partially lost from the matrix while other proteins, e.g. COMP, were still found associated with the newly formed collagen network. The lack of collagen II induced changes in the expression profile of integrins. Further, we detected alterations in the Indian hedgehog/parathyroid hormone-related protein (Ihh/PTHrP) pathway that were accompanied by changes in the differentiation state of chondrocytes. Collagen II seems not to be essential for chondrocyte survival in culture but it plays an important role in maintaining chondrocyte differentiation. We suggest that a crosstalk between extracellular matrix and cells via integrins and the Ihh/PTHrP pathway is involved in regulating the differentiation state of chondrocytes.
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Affiliation(s)
- Wei Xin
- Central Laboratory, Shandong Provincial Hospital affiliated to Shandong University , Jinan , China
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70
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Barczyk M, Bolstad AI, Gullberg D. Role of integrins in the periodontal ligament: organizers and facilitators. Periodontol 2000 2015; 63:29-47. [PMID: 23931052 PMCID: PMC3791550 DOI: 10.1111/prd.12027] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/01/2012] [Indexed: 12/21/2022]
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71
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Olivares-Navarrete R, Rodil SE, Hyzy SL, Dunn GR, Almaguer-Flores A, Schwartz Z, Boyan BD. Role of integrin subunits in mesenchymal stem cell differentiation and osteoblast maturation on graphitic carbon-coated microstructured surfaces. Biomaterials 2015; 51:69-79. [PMID: 25770999 DOI: 10.1016/j.biomaterials.2015.01.035] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 12/26/2014] [Accepted: 01/20/2015] [Indexed: 12/20/2022]
Abstract
Surface roughness, topography, chemistry, and energy promote osteoblast differentiation and increase osteogenic local factor production in vitro and bone-to-implant contact in vivo, but the mechanisms involved are not well understood. Knockdown of integrin heterodimer alpha2beta1 (α2β1) blocks the osteogenic effects of the surface, suggesting signaling by this integrin homodimer is required. The purpose of the present study was to separate effects of surface chemistry and surface structure on integrin expression by coating smooth or rough titanium (Ti) substrates with graphitic carbon, retaining surface morphology but altering surface chemistry. Ti surfaces (smooth [Ra < 0.4 μm], rough [Ra ≥ 3.4 μm]) were sputter-coated using a magnetron sputtering system with an ultrapure graphite target, producing a graphitic carbon thin film. Human mesenchymal stem cells and MG63 osteoblast-like cells had higher mRNA for integrin subunits α1, α2, αv, and β1 on rough surfaces in comparison to smooth, and integrin αv on graphitic-carbon-coated rough surfaces in comparison to Ti. Osteogenic differentiation was greater on rough surfaces in comparison to smooth, regardless of chemistry. Silencing integrins β1, α1, or α2 decreased osteoblast maturation on rough surfaces independent of surface chemistry. Silencing integrin αv decreased maturation only on graphitic carbon-coated surfaces, not on Ti. These results suggest a major role of the integrin β1 subunit in roughness recognition, and that integrin alpha subunits play a major role in surface chemistry recognition.
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Affiliation(s)
- Rene Olivares-Navarrete
- Department of Biomedical Engineering, School of Engineering, Virginia Commonwealth University, Richmond, VA, USA
| | - Sandra E Rodil
- Instituto de Investigaciones en Materiales, Universidad Nacional Autonoma de Mexico, Mexico City, Mexico
| | - Sharon L Hyzy
- Department of Biomedical Engineering, School of Engineering, Virginia Commonwealth University, Richmond, VA, USA
| | - Ginger R Dunn
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, USA
| | | | - Zvi Schwartz
- Department of Biomedical Engineering, School of Engineering, Virginia Commonwealth University, Richmond, VA, USA
| | - Barbara D Boyan
- Department of Biomedical Engineering, School of Engineering, Virginia Commonwealth University, Richmond, VA, USA; Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, USA.
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72
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Cescon M, Gattazzo F, Chen P, Bonaldo P. Collagen VI at a glance. J Cell Sci 2015; 128:3525-31. [DOI: 10.1242/jcs.169748] [Citation(s) in RCA: 175] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Accepted: 08/10/2015] [Indexed: 12/17/2022] Open
Abstract
Collagen VI represents a remarkable extracellular matrix molecule, and in the past few years, studies of this molecule have revealed its involvement in a wide range of tissues and pathological conditions. In addition to its complex multi-step pathway of biosynthesis and assembly that leads to the formation of a characteristic and distinctive network of beaded microfilaments in the extracellular matrix, collagen VI exerts several key roles in different tissues. These range from unique biomechanical roles to cytoprotective functions in different cells, including myofibers, chondrocytes, neurons, fibroblasts and cardiomyocytes. Indeed, collagen VI has been shown to exert a surprisingly broad range of cytoprotective effects, which include counteracting apoptosis and oxidative damage, favoring tumor growth and progression, regulating autophagy and cell differentiation, and even contributing to the maintenance of stemness. In this Cell Science at a Glance article and the accompanying poster, we present the current knowledge of collagen VI, and in particular, discuss its relevance in stemness and in preserving the mechanical properties of tissues, as well as its links with human disorders.
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Affiliation(s)
- Matilde Cescon
- Department of Molecular Medicine, University of Padova, Padova 35131, Italy
| | - Francesca Gattazzo
- Department of Molecular Medicine, University of Padova, Padova 35131, Italy
| | - Peiwen Chen
- Department of Molecular Medicine, University of Padova, Padova 35131, Italy
| | - Paolo Bonaldo
- Department of Molecular Medicine, University of Padova, Padova 35131, Italy
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73
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Chouhan BS, Käpylä J, Denessiouk K, Denesyuk A, Heino J, Johnson MS. Early chordate origin of the vertebrate integrin αI domains. PLoS One 2014; 9:e112064. [PMID: 25409021 PMCID: PMC4237329 DOI: 10.1371/journal.pone.0112064] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Accepted: 10/11/2014] [Indexed: 12/17/2022] Open
Abstract
Half of the 18 human integrins α subunits have an inserted αI domain yet none have been observed in species that have diverged prior to the appearance of the urochordates (ascidians). The urochordate integrin αI domains are not human orthologues but paralogues, but orthologues of human αI domains extend throughout later-diverging vertebrates and are observed in the bony fish with duplicate isoforms. Here, we report evidence for orthologues of human integrins with αI domains in the agnathostomes (jawless vertebrates) and later diverging species. Sequence comparisons, phylogenetic analyses and molecular modeling show that one nearly full-length sequence from lamprey and two additional fragments include the entire integrin αI domain region, have the hallmarks of collagen-binding integrin αI domains, and we show that the corresponding recombinant proteins recognize the collagen GFOGER motifs in a metal dependent manner, unlike the α1I domain of the ascidian C. intestinalis. The presence of a functional collagen receptor integrin αI domain supports the origin of orthologues of the human integrins with αI domains prior to the earliest diverging extant vertebrates, a domain that has been conserved and diversified throughout the vertebrate lineage.
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Affiliation(s)
- Bhanupratap Singh Chouhan
- Structural Bioinformatics Laboratory, Biochemistry, Department of Biosciences, Åbo Akademi University, Turku, Finland
| | - Jarmo Käpylä
- Department of Biochemistry, University of Turku, Turku, Finland
| | - Konstantin Denessiouk
- Structural Bioinformatics Laboratory, Biochemistry, Department of Biosciences, Åbo Akademi University, Turku, Finland
| | - Alexander Denesyuk
- Structural Bioinformatics Laboratory, Biochemistry, Department of Biosciences, Åbo Akademi University, Turku, Finland
| | - Jyrki Heino
- Department of Biochemistry, University of Turku, Turku, Finland
| | - Mark S. Johnson
- Structural Bioinformatics Laboratory, Biochemistry, Department of Biosciences, Åbo Akademi University, Turku, Finland
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74
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Borrirukwanit K, Pavasant P, Blick T, Lafleur MA, Thompson EW. High threshold of β1 integrin inhibition required to block collagen I-induced membrane type-1 matrix metalloproteinase (MT1-MMP) activation of matrix metalloproteinase 2 (MMP-2). Cancer Cell Int 2014; 14:99. [PMID: 25317077 PMCID: PMC4195858 DOI: 10.1186/s12935-014-0099-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Accepted: 09/21/2014] [Indexed: 01/17/2023] Open
Abstract
Background Matrix metalloproteinase-2 (MMP-2) is an endopeptidase that facilitates extracellular matrix remodeling and molecular regulation, and is implicated in tumor metastasis. Type I collagen (Col I) regulates the activation of MMP-2 through both transcriptional and post-transcriptional means; however gaps remain in our understanding of the involvement of collagen-binding β1 integrins in collagen-stimulated MMP-2 activation. Methods Three β1 integrin siRNAs were used to elucidate the involvement of β1 integrins in the Col I-induced MMP-2 activation mechanism. β1 integrin knockdown was analyzed by quantitative RT-PCR, Western Blot and FACS analysis. Adhesion assay and collagen gel contraction were used to test the biological effects of β1 integrin abrogation. MMP-2 activation levels were monitored by gelatin zymography. Results All three β1 integrin siRNAs were efficient at β1 integrin knockdown and FACS analysis revealed commensurate reductions of integrins α2 and α3, which are heterodimeric partners of β1, but not αV, which is not. All three β1 integrin siRNAs inhibited adhesion and collagen gel contraction, however only the siRNA showing the greatest magnitude of β1 knockdown inhibited Col I-induced MMP-2 activation and reduced the accompanying upregulation of MT1-MMP, suggesting a dose response threshold effect. Re-transfection with codon-swapped β1 integrin overcame the reduction in MMP-2 activation induced by Col-1, confirming the β1 integrin target specificity. MMP-2 activation induced by TPA or Concanavalin A (Con A) was not inhibited by β1 integrin siRNA knockdown. Conclusion Together, the data reveals that strong abrogation of β1 integrin is required to block MMP-2 activation induced by Col I, which may have implications for the therapeutic targeting of β1 integrin.
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Affiliation(s)
- Kulrut Borrirukwanit
- Department of Nursing, Phetchabun Hospital, Phetchabun, Thailand ; Invasion and Metastasis Unit, St. Vincent's Institute, Fitzroy, Victoria 3065 Australia
| | - Prasit Pavasant
- Department of Anatomy, Faculty of Dentistry, Chulalongkorn University, Chulalongkorn, Thailand
| | - Tony Blick
- Invasion and Metastasis Unit, St. Vincent's Institute, Fitzroy, Victoria 3065 Australia ; Institute of Health and Biomedical Innovation and School of Biomedical Sciences, Queensland University of Technology, Kelvin Grove, Queensland Australia
| | - Marc A Lafleur
- Invasion and Metastasis Unit, St. Vincent's Institute, Fitzroy, Victoria 3065 Australia
| | - Erik W Thompson
- Invasion and Metastasis Unit, St. Vincent's Institute, Fitzroy, Victoria 3065 Australia ; Department of Surgery, St Vincent's Hospital, University of Melbourne, Fitzroy, Victoria Australia ; Institute of Health and Biomedical Innovation and School of Biomedical Sciences, Queensland University of Technology, Kelvin Grove, Queensland Australia
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75
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Sur S, Guler MO, Webber MJ, Pashuck ET, Ito M, Stupp SI, Launey T. Synergistic regulation of cerebellar Purkinje neuron development by laminin epitopes and collagen on an artificial hybrid matrix construct. Biomater Sci 2014; 2:903-914. [PMID: 25530849 PMCID: PMC4269166 DOI: 10.1039/c3bm60228a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The extracellular matrix (ECM) creates a dynamic environment around the cells in the developing central nervous system, providing them with the necessary biochemical and biophysical signals. Although the functions of many ECM molecules in neuronal development have been individually studied in detail, the combinatorial effects of multiple ECM components are not well characterized. Here we demonstrate that the expression of collagen and laminin-1 (lam-1) are spatially and temporally correlated during embryonic and post-natal development of the cerebellum. These changes in ECM distribution correspond to specific stages of Purkinje neuron (PC) migration, somatic monolayer formation and polarization. To clarify the respective roles of these ECM molecules on PC development, we cultured cerebellar neurons on a hybrid matrix comprised of collagen and a synthetic peptide amphiphile nanofiber bearing a potent lam-1 derived bioactive IKVAV peptide epitope. By systematically varying the concentration and ratio of collagen and the laminin epitope in the matrix, we could demonstrate a synergistic relationship between these two ECM components in controlling multiple aspects of PC maturation. An optimal ratio of collagen and IKVAV in the matrix was found to promote maximal PC survival and dendrite growth, while dendrite penetration into the matrix was enhanced by a high IKVAV to collagen ratio. In addition, the laminin epitope was found to guide PC axon development. By combining our observations in vivo and in vitro, we propose a model of PC development where the synergistic effects of collagen and lam-1 play a key role in migration, polarization and morphological maturation of PCs.
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Affiliation(s)
- Shantanu Sur
- Laboratory for Memory and Learning, RIKEN Brain Science Institute, Wako-shi, 351-0198 Saitama, Japan
- School of Medical Science and Technology, IIT Kharagpur, 721302, India
- The Institute for Bionanotechnology in Medicine (IBNAM), Northwestern University, Chicago, IL 60611, USA
| | - Mustafa O. Guler
- The Institute for Bionanotechnology in Medicine (IBNAM), Northwestern University, Chicago, IL 60611, USA
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara, 06800, Turkey
| | - Matthew J. Webber
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Eugene T. Pashuck
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Masao Ito
- Laboratory for Memory and Learning, RIKEN Brain Science Institute, Wako-shi, 351-0198 Saitama, Japan
| | - Samuel I. Stupp
- The Institute for Bionanotechnology in Medicine (IBNAM), Northwestern University, Chicago, IL 60611, USA
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA
- Department of Chemistry, Northwestern University, Evanston, IL 60208, USA
| | - Thomas Launey
- Laboratory for Memory and Learning, RIKEN Brain Science Institute, Wako-shi, 351-0198 Saitama, Japan
- Launey Research Unit for Molecular Neurocybernetics, RIKEN Brain Science Institute, Wako-shi, 351-0198 Saitama, Japan
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76
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Sipilä K, Haag S, Denessiouk K, Käpylä J, Peters EC, Denesyuk A, Hansen U, Konttinen Y, Johnson MS, Holmdahl R, Heino J. Citrullination of collagen II affects integrin‐mediated cell adhesion in a receptor‐specific manner. FASEB J 2014; 28:3758-68. [DOI: 10.1096/fj.13-247767] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Kalle Sipilä
- Department of BiochemistryUniversity of TurkuTurkuFinland
| | - Sabrina Haag
- Division of Medical Inflammation Research, Department of Medical Biochemistry and BiophysicsKarolinska InstitutetStockholmSweden
| | - Konstantin Denessiouk
- Structural Bioinformatics Laboratory, Biochemistry, Department of BioscienceÅbo Akademi UniversityTurkuFinland
| | - Jarmo Käpylä
- Department of BiochemistryUniversity of TurkuTurkuFinland
| | - Eric C. Peters
- Genomics Institute of the Novartis Research FoundationSan DiegoCaliforniaUSA
| | - Alexander Denesyuk
- Structural Bioinformatics Laboratory, Biochemistry, Department of BioscienceÅbo Akademi UniversityTurkuFinland
| | - Uwe Hansen
- Department of Physiology, Chemistry, and PathobiochemistryMuenster University HospitalMuensterGermany
| | - Yrjö Konttinen
- Department of MedicineInstitute of Clinical Medicine, University of HelsinkiHelsinkiFinland
| | - Mark S. Johnson
- Structural Bioinformatics Laboratory, Biochemistry, Department of BioscienceÅbo Akademi UniversityTurkuFinland
| | - Rikard Holmdahl
- Medicity Research LaboratoryUniversity of TurkuTurkuFinland
- Division of Medical Inflammation Research, Department of Medical Biochemistry and BiophysicsKarolinska InstitutetStockholmSweden
| | - Jyrki Heino
- Department of BiochemistryUniversity of TurkuTurkuFinland
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77
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Kapp TG, Rechenmacher F, Sobahi TR, Kessler H. Integrin modulators: a patent review. Expert Opin Ther Pat 2014; 23:1273-95. [PMID: 24050747 DOI: 10.1517/13543776.2013.818133] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
INTRODUCTION Integrins are heterodimeric cell surface receptors, which enable adhesion, proliferation, and migration of cells by recognizing binding motifs in extracellular matrix (ECM) proteins. As transmembrane linkers between the cytoskeleton and the ECM, they are able to recruit a huge variety of proteins and to influence signaling pathways bidirectionally, thereby regulating gene expression and cell survival. Hence, integrins play a key role in various physiological as well as pathological processes, which has turned them into an attractive target for pharmaceutical research. AREAS COVERED In this review, the latest therapeutic developments of drug candidates and recently patented integrin ligands are summarized. EXPERT OPINION Integrins have been proven to be valuable therapeutic targets in the treatment of several inflammatory and autoimmune diseases, where leukocyte adhesion processes are regulated by them. Furthermore, they play an important role in pathological angiogenesis and tumor metastasis, being a promising target for cancer therapy.
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Affiliation(s)
- Tobias G Kapp
- Institute for Advanced Study (IAS) and Center for Integrated Protein Science (CIPSM), Department Chemie, Technische Universität München , Lichtenbergstrasse 4, 85747 Garching , Germany
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78
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Chin YKY, Headey S, Mohanty B, Emsley J, Simpson JS, Scanlon MJ. Assignments of human integrin α1I domain in the apo and Mg²⁺ bound states. BIOMOLECULAR NMR ASSIGNMENTS 2014; 8:117-121. [PMID: 23339031 DOI: 10.1007/s12104-013-9465-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Accepted: 01/12/2013] [Indexed: 06/01/2023]
Abstract
The α1β1 integrin receptor binds to its main extracellular ligand, collagen, through an inserted domain in its α-subunit called the αI domain (αI). αI contains a metal binding site that allows collagen to coordinate to the domain through a divalent metal ion. Here we report the backbone assignments of the apo and Mg(2+) bound state of the isolated human α1I and the chemical shift changes resulting from metal coordination.
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Affiliation(s)
- Yanni K-Y Chin
- Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus), 381 Royal Parade, Parkville, VIC, 3052, Australia
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79
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Collagen XXII binds to collagen-binding integrins via the novel motifs GLQGER and GFKGER. Biochem J 2014; 459:217-27. [DOI: 10.1042/bj20130642] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Cell attachment to collagens is mediated by integrins. In the present study, we define two new integrin-binding motifs, GLQGER and GFKGER, within the collagen XXII triple helical domain. Mutation of the two motifs in collagen XXII abolishes the binding to HaCaT cells completely.
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80
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Bayer ML, Schjerling P, Herchenhan A, Zeltz C, Heinemeier KM, Christensen L, Krogsgaard M, Gullberg D, Kjaer M. Release of tensile strain on engineered human tendon tissue disturbs cell adhesions, changes matrix architecture, and induces an inflammatory phenotype. PLoS One 2014; 9:e86078. [PMID: 24465881 PMCID: PMC3897642 DOI: 10.1371/journal.pone.0086078] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Accepted: 12/11/2013] [Indexed: 11/18/2022] Open
Abstract
Mechanical loading of tendon cells results in an upregulation of mechanotransduction signaling pathways, cell-matrix adhesion and collagen synthesis, but whether unloading removes these responses is unclear. We investigated the response to tension release, with regard to matrix proteins, pro-inflammatory mediators and tendon phenotypic specific molecules, in an in vitro model where tendon-like tissue was engineered from human tendon cells. Tissue sampling was performed 1, 2, 4 and 6 days after surgical de-tensioning of the tendon construct. When tensile stimulus was removed, integrin type collagen receptors showed a contrasting response with a clear drop in integrin subunit α11 mRNA and protein expression, and an increase in α2 integrin mRNA and protein levels. Further, specific markers for tendon cell differentiation declined and normal tendon architecture was disturbed, whereas pro-inflammatory molecules were upregulated. Stimulation with the cytokine TGF-β1 had distinct effects on some tendon-related genes in both tensioned and de-tensioned tissue. These findings indicate an important role of mechanical loading for cellular and matrix responses in tendon, including that loss of tension leads to a decrease in phenotypical markers for tendon, while expression of pro-inflammatory mediators is induced.
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Affiliation(s)
- Monika L Bayer
- Institute of Sports Medicine, Department of Orthopedic Surgery M, Bispebjerg Hospital and Center for Healthy Aging, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Peter Schjerling
- Institute of Sports Medicine, Department of Orthopedic Surgery M, Bispebjerg Hospital and Center for Healthy Aging, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Andreas Herchenhan
- Institute of Sports Medicine, Department of Orthopedic Surgery M, Bispebjerg Hospital and Center for Healthy Aging, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Cedric Zeltz
- Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Katja M Heinemeier
- Institute of Sports Medicine, Department of Orthopedic Surgery M, Bispebjerg Hospital and Center for Healthy Aging, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Lise Christensen
- Department of Pathology, Bispebjerg Hospital, University of Copenhagen, Copenhagen, Denmark
| | - Michael Krogsgaard
- Section for Sports Traumatology, Department of Orthopedic Surgery M, Bispebjerg Hospital, University of Copenhagen, Copenhagen, Denmark
| | - Donald Gullberg
- Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Michael Kjaer
- Institute of Sports Medicine, Department of Orthopedic Surgery M, Bispebjerg Hospital and Center for Healthy Aging, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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81
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Heino J. Cellular signaling by collagen-binding integrins. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2014; 819:143-55. [PMID: 25023173 DOI: 10.1007/978-94-017-9153-3_10] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The four collagen-binding αI domain integrins form their own subgroup among cell adhesion receptors. The signaling functions of α1β1 and α2β1 integrins have been analyzed in many experimental models, whereas less studies are available about the more recently found α10β1 and α11β1 heterodimers. Interestingly, collagen binding by α1β1 and α2β1 often generates opposite cellular responses. For example α1β1 has often been reported to promote cell proliferation and to suppress collagen synthesis, whereas α2β1 can in many model systems inhibit growth and promote collagen synthesis. There are obviously cell type dependent factors modifying the signaling. Additionally the structure and the organization of collagenous matrix play a critic role. Many recent studies have also stressed the importance of the crosstalk between the integrins and other cell surface receptors.
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Affiliation(s)
- Jyrki Heino
- Department of Biochemistry, University of Turku, 20014, Turku, Finland,
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82
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Abstract
Integrin α1β1 is widely expressed in mesenchyme and the immune system, as well as a minority of epithelial tissues. Signaling through α1 contributes to the regulation of extracellular matrix composition, in addition to supplying in some tissues a proliferative and survival signal that appears to be unique among the collagen binding integrins. α1 provides a tissue retention function for cells of the immune system including monocytes and T cells, where it also contributes to their long-term survival, providing for peripheral T cell memory, and contributing to diseases of autoimmunity. The viability of α1 null mice, as well as the generation of therapeutic monoclonal antibodies against this molecule, have enabled studies of the role of α1 in a wide range of pathophysiological circumstances. The immune functions of α1 make it a rational therapeutic target.
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83
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Integrin Recognition Motifs in the Human Collagens. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2014; 819:127-42. [DOI: 10.1007/978-94-017-9153-3_9] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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84
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Integrin α10β1: a collagen receptor critical in skeletal development. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2014; 819:61-71. [PMID: 25023167 DOI: 10.1007/978-94-017-9153-3_4] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Integrin α10β1 is the most abundant collagen-binding integrin in cartilaginous tissues and its expression pattern is distinct from that of other collagen-binding integrins. In vitro and in vivo studies have identified integrin α10β1 as a unique phenotypic marker for chondrocyte differentiation and a crucial mediator of cell-matrix interactions required for proper cartilage development. This chapter describes the structure of the integrin subunit α10, the tissue distribution of the integrin 10β1 and updates available information regarding its regulation and ligand binding. We also summarize current information on the functional roles of α10β1 in chondrogenesis of mesenchymal stem cells and in skeletal growth.
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85
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Madamanchi A, Santoro SA, Zutter MM. α2β1 Integrin. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2014; 819:41-60. [PMID: 25023166 DOI: 10.1007/978-94-017-9153-3_3] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The α2β1 integrin, also known as VLA-2, GPIa-IIa, CD49b, was first identified as an extracellular matrix receptor for collagens and/or laminins [55, 56]. It is now recognized that the α2β1 integrin serves as a receptor for many matrix and nonmatrix molecules [35, 79, 128]. Extensive analyses have clearly elucidated the α2 I domain structural motifs required for ligand binding, and also defined distinct conformations that lead to inactive, partially active or highly active ligand binding [3, 37, 66, 123, 136, 137, 140]. The mechanisms by which the α2β1 integrin plays a critical role in platelet function and homeostasis have been carefully defined via in vitro and in vivo experiments [76, 104, 117, 125]. Genetic and epidemiologic studies have confirmed human physiology and disease states mediated by this receptor in immunity, cancer, and development [6, 20, 21, 32, 43, 90]. The role of the α2β1 integrin in these multiple complex biologic processes will be discussed in the chapter.
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Affiliation(s)
- Aasakiran Madamanchi
- Department of Pathology, Microbiology and Immunology, Vanderbilt University School of Medicine, Nashville, TN, USA
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86
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Chin YKY, Headey SJ, Mohanty B, Patil R, McEwan PA, Swarbrick JD, Mulhern TD, Emsley J, Simpson JS, Scanlon MJ. The structure of integrin α1I domain in complex with a collagen-mimetic peptide. J Biol Chem 2013; 288:36796-809. [PMID: 24187131 PMCID: PMC3873540 DOI: 10.1074/jbc.m113.480251] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Revised: 10/04/2013] [Indexed: 11/06/2022] Open
Abstract
We have determined the structure of the human integrin α1I domain bound to a triple-helical collagen peptide. The structure of the α1I-peptide complex was investigated using data from NMR, small angle x-ray scattering, and size exclusion chromatography that were used to generate and validate a model of the complex using the data-driven docking program, HADDOCK (High Ambiguity Driven Biomolecular Docking). The structure revealed that the α1I domain undergoes a major conformational change upon binding of the collagen peptide. This involves a large movement in the C-terminal helix of the αI domain that has been suggested to be the mechanism by which signals are propagated in the intact integrin receptor. The structure suggests a basis for the different binding selectivity observed for the α1I and α2I domains. Mutational data identify residues that contribute to the conformational change observed. Furthermore, small angle x-ray scattering data suggest that at low collagen peptide concentrations the complex exists in equilibrium between a 1:1 and 2:1 α1I-peptide complex.
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Affiliation(s)
- Yanni K.-Y. Chin
- From Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences and
| | - Stephen J. Headey
- From Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences and
| | - Biswaranjan Mohanty
- From Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences and
- Australian Research Council Centre of Excellence for Coherent X-ray Science, Monash University, Parkville, Victoria 3052, Australia
| | - Rahul Patil
- From Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences and
| | - Paul A. McEwan
- School of Pharmacy, Centre for Biomolecular Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom, and
| | - James D. Swarbrick
- From Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences and
| | - Terrence D. Mulhern
- Department of Biochemistry and Molecular Biology, Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Victoria 3010, Australia
| | - Jonas Emsley
- School of Pharmacy, Centre for Biomolecular Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom, and
| | - Jamie S. Simpson
- From Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences and
| | - Martin J. Scanlon
- From Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences and
- Australian Research Council Centre of Excellence for Coherent X-ray Science, Monash University, Parkville, Victoria 3052, Australia
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87
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Zeltz C, Orgel J, Gullberg D. Molecular composition and function of integrin-based collagen glues-introducing COLINBRIs. Biochim Biophys Acta Gen Subj 2013; 1840:2533-48. [PMID: 24361615 DOI: 10.1016/j.bbagen.2013.12.022] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Revised: 12/13/2013] [Accepted: 12/14/2013] [Indexed: 01/06/2023]
Abstract
BACKGROUND Despite detailed knowledge about the structure and signaling properties of individual collagen receptors, much remains to be learned about how these receptors participate in linking cells to fibrillar collagen matrices in tissues. In addition to collagen-binding integrins, a group of proteins with affinity both for fibrillar collagens and integrins link these two protein families together. We have introduced the name COLINBRI (COLlagen INtegrin BRIdging) for this set of molecules. Whereas collagens are the major building blocks in tissues and defects in these structural proteins have severe consequences for tissue integrity, the mild phenotypes of the integrin type of collagen receptors have raised questions about their importance in tissue biology and pathology. SCOPE OF REVIEW We will discuss the two types of cell linkages to fibrillar collagen (direct- versus indirect COLINBRI-mediated) and discuss how the parallel existence of direct and indirect linkages to collagens may ensure tissue integrity. MAJOR CONCLUSIONS The observed mild phenotypes of mice deficient in collagen-binding integrins and the relatively restricted availability of integrin-binding sequences in mature fibrillar collagen matrices support the existence of indirect collagen-binding mechanisms in parallel with direct collagen binding in vivo. GENERAL SIGNIFICANCE A continued focus on understanding the molecular details of cell adhesion mechanisms to collagens will be important and will benefit our understanding of diseases like tissue- and tumor fibrosis where collagen dynamics are disturbed. This article is part of a Special Issue entitled Matrix-mediated cell behaviour and properties.
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Affiliation(s)
- Cédric Zeltz
- Department of Biomedicine and Centre for Cancer Biomarkers, Norwegian Centre of Excellence, University of Bergen, Jonas Lies vei 91, N-5009 Bergen, Norway
| | - Joseph Orgel
- Departments of Biology, Physics and Biomedical Engineering, Pritzker Institute of Biomedical Science and Engineering, Illinois Institute of Technology, 3440 S. Dearborn Ave, Chicago, IL 60616, USA
| | - Donald Gullberg
- Department of Biomedicine and Centre for Cancer Biomarkers, Norwegian Centre of Excellence, University of Bergen, Jonas Lies vei 91, N-5009 Bergen, Norway.
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88
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Canine chondrodysplasia caused by a truncating mutation in collagen-binding integrin alpha subunit 10. PLoS One 2013; 8:e75621. [PMID: 24086591 PMCID: PMC3783422 DOI: 10.1371/journal.pone.0075621] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Accepted: 07/24/2013] [Indexed: 11/19/2022] Open
Abstract
The skeletal dysplasias are disorders of the bone and cartilage tissues. Similarly to humans, several dog breeds have been reported to suffer from different types of genetic skeletal disorders. We have studied the molecular genetic background of an autosomal recessive chondrodysplasia that affects the Norwegian Elkhound and Karelian Bear Dog breeds. The affected dogs suffer from disproportionate short stature dwarfism of varying severity. Through a genome-wide approach, we mapped the chondrodysplasia locus to a 2-Mb region on canine chromosome 17 in nine affected and nine healthy Elkhounds (praw = 7.42×10−6, pgenome-wide = 0.013). The associated locus contained a promising candidate gene, cartilage specific integrin alpha 10 (ITGA10), and mutation screening of its 30 exons revealed a nonsense mutation in exon 16 (c.2083C>T; p.Arg695*) that segregated fully with the disease in both breeds (p = 2.5×10−23). A 24% mutation carrier frequency was indicated in NEs and an 8% frequency in KBDs. The ITGA10 gene product, integrin receptor α10-subunit combines into a collagen-binding α10β1 integrin receptor, which is expressed in cartilage chondrocytes and mediates chondrocyte-matrix interactions during endochondral ossification. As a consequence of the nonsense mutation, the α10-protein was not detected in the affected cartilage tissue. The canine phenotype highlights the importance of the α10β1 integrin in bone growth, and the large animal model could be utilized to further delineate its specific functions. Finally, this study revealed a candidate gene for human chondrodysplasias and enabled the development of a genetic test for breeding purposes to eradicate the disease from the two dog breeds.
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89
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Stange R, Kronenberg D, Timmen M, Everding J, Hidding H, Eckes B, Hansen U, Holtkamp M, Karst U, Pap T, Raschke MJ. Age-related bone deterioration is diminished by disrupted collagen sensing in integrin α2β1 deficient mice. Bone 2013; 56:48-54. [PMID: 23680479 DOI: 10.1016/j.bone.2013.05.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Revised: 05/04/2013] [Accepted: 05/06/2013] [Indexed: 11/28/2022]
Abstract
Collagen binding integrins are of essential importance in the crosstalk between cells and the extracellular matrix. Integrin α2β1 is a major receptor for collagen I, the most abundant protein in bone. In this study we show for the first time that integrin α2 deficiency is linked to collagen type I expression in bone. Investigating the femurs of wild type and integrin α2β1 deficient mice, we found that loss of integrin α2 results in altered bone properties. Histomorphometric analysis of integrin α2 long bones displayed more trabecular network compared to wild type bones. During age related bone loss the integrin α2β1 deficient bones retain trabecular structure even at old age. These findings were supported by functional, biomechanical testing, wherein the bones of integrin α2β1 deficient mice do not undergo age-related alteration of biomechanical properties. These results might be explained by the increased presence of collagen in integrin α2β1 deficient bone. Collagen type I could be detected in higher quantities in the integrin α2β1 deficient bones, forming abnormal, amorphous fibrils. This was linked to higher expression levels of collagen type I and other bone formation related proteins as alkaline phosphatase of integrin α2β1 deficient osteoblasts. Osteoclasts of integrin α2β1 deficient mice did not show any differences. Consequently these results indicate that the absence of integrin α2β1 alleviates the effects of age related bone degradation through over-expression of collagen type I and demonstrate a molecular mechanism how collagen binding integrins might directly impact bone aging.
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Affiliation(s)
- Richard Stange
- Department of Trauma, Hand and Reconstructive Surgery, University Hospital Muenster, Germany.
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90
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Lai C, Liu X, Tian C, Wu F. Integrin α1 has a long helix, extending from the transmembrane region to the cytoplasmic tail in detergent micelles. PLoS One 2013; 8:e62954. [PMID: 23646163 PMCID: PMC3639902 DOI: 10.1371/journal.pone.0062954] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Accepted: 03/26/2013] [Indexed: 12/12/2022] Open
Abstract
Integrin proteins are very important adhesion receptors that mediate cell-cell and cell-extracellular matrix interactions. They play essential roles in cell signaling and the regulation of cellular shape, motility, and the cell cycle. Here, the transmembrane and cytoplasmic (TMC) domains of integrin α1 and β1 were over-expressed and purified in detergent micelles. The structure and backbone relaxations of α1-TMC in LDAO micelles were determined and analyzed using solution NMR. A long helix, extending from the transmembrane region to the cytoplasmic tail, was observed in α1-TMC. Structural comparisons of α1-TMC with reported αIIb-TMC domains indicated different conformations in the transmembrane regions and cytoplasmic tails. An NMR titration experiment indicated weak interactions between α1-TMC and β1-TMC through several α1-TMC residues located at its N-terminal juxta-transmembrane region and C-terminal extended helix region.
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Affiliation(s)
- Chaohua Lai
- Hefei National Laboratory for Physical Science at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, China
| | - Xiaoxi Liu
- Hefei National Laboratory for Physical Science at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, China
| | - Changlin Tian
- Hefei National Laboratory for Physical Science at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, China
- High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, Anhui, China
- * E-mail: (CT); (FW)
| | - Fangming Wu
- High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, Anhui, China
- * E-mail: (CT); (FW)
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91
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Collagen VI in cancer and its biological mechanisms. Trends Mol Med 2013; 19:410-7. [PMID: 23639582 DOI: 10.1016/j.molmed.2013.04.001] [Citation(s) in RCA: 113] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Revised: 03/26/2013] [Accepted: 04/02/2013] [Indexed: 12/21/2022]
Abstract
Collagen VI is a widely distributed extracellular matrix protein highly expressed in a variety of cancers that favors tumor growth and progression. A growing number of studies indicate that collagen VI directly affects malignant cells by acting on the Akt-GSK-3β-β-catenin-TCF/LEF axis, enhancing the production of protumorigenic factors and inducing epithelial-mesenchymal transition. Moreover, it affects the tumor microenvironment by increasing the recruitment of macrophages and endothelial cells, thus promoting tumor inflammation and angiogenesis. Furthermore, collagen VI promotes chemotherapy resistance and can be regarded as a potential biomarker for cancer diagnosis. Collectively, these findings strongly support a role for collagen VI as an important regulator in tumors and provide new targets for cancer therapies.
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92
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Jakubowski P, Calvete JJ, Eble JA, Lazarovici P, Marcinkiewicz C. Identification of inhibitors of α2β1 integrin, members of C-lectin type proteins, in Echis sochureki venom. Toxicol Appl Pharmacol 2013; 269:34-42. [PMID: 23499869 DOI: 10.1016/j.taap.2013.03.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2013] [Revised: 02/26/2013] [Accepted: 03/01/2013] [Indexed: 10/27/2022]
Abstract
Snake venom antagonists of α2β1 integrin have been identified as members of a C-lectin type family of proteins (CLP). In the present study, we characterized three new CLPs isolated from Echis sochureki venom, which interact with this integrin. These proteins were purified using a combination of gel filtration, ion exchange chromatography and reverse phase HPLC. Sochicetin-A and sochicetin-B potently inhibited adhesion of cells expressing α2β1 integrin and binding of isolated α2β1 ectodomain to collagen I, as well as bound to recombinant GST-α2A domain in ELISA, whereas activity of sochicetin-C in these assays was approximately two orders of magnitude lower. Structurally, sochicetin-B and sochicetin-C are typical heterodimeric αβ CLPs, whereas sochicetin-A exhibits a trimer of its subunits (αβ)₃ in the quaternary structure. Immobilized sochicetins supported adhesion of glioma cell lines, LN18 and LBC3, whereas in a soluble form they partially inhibited adhesion of these cells to collagen I. Glioma cells spread very poorly on sochicetin-A, showing no cytoskeleton rearrangement typical for adhesion to collagen I or fibronectin. Adhesion on CLP does not involve focal adhesion elements, such as vinculin. Sochicetin-A also inhibited collagen-induced platelet aggregation, similar to other CLPs' action on the blood coagulation system.
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Affiliation(s)
- Piotr Jakubowski
- Department of Biology, Temple University, Philadelphia, PA 19122, USA
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93
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Tigges U, Boroujerdi A, Welser-Alves JV, Milner R. TNF-α promotes cerebral pericyte remodeling in vitro, via a switch from α1 to α2 integrins. J Neuroinflammation 2013; 10:33. [PMID: 23448258 PMCID: PMC3616978 DOI: 10.1186/1742-2094-10-33] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Accepted: 02/15/2013] [Indexed: 01/07/2023] Open
Abstract
Background There is increasing evidence to suggest that pericytes play a crucial role in regulating the remodeling state of blood vessels. As cerebral pericytes are embedded within the extracellular matrix (ECM) of the vascular basal lamina, it is important to understand how individual ECM components influence pericyte remodeling behavior, and how cytokines regulate these events. Methods The influence of different vascular ECM substrates on cerebral pericyte behavior was examined in assays of cell adhesion, migration, and proliferation. Pericyte expression of integrin receptors was examined by flow cytometry. The influence of cytokines on pericyte functions and integrin expression was also examined, and the role of specific integrins in mediating these effects was defined by function-blocking antibodies. Expression of pericyte integrins within remodeling cerebral blood vessels was analyzed using dual immunofluorescence (IF) of brain sections derived from the animal model of multiple sclerosis, experimental autoimmune encephalomyelitis (EAE). Results Fibronectin and collagen I promoted pericyte proliferation and migration, but heparan sulfate proteoglycan (HSPG) had an inhibitory influence on pericyte behavior. Flow cytometry showed that cerebral pericytes express high levels of α5 integrin, and lower levels of α1, α2, and α6 integrins. The pro-inflammatory cytokine tumor necrosis factor (TNF)-α strongly promoted pericyte proliferation and migration, and concomitantly induced a switch in pericyte integrins, from α1 to α2 integrin, the opposite to the switch seen when pericytes differentiated. Inhibition studies showed that α2 integrin mediates pericyte adhesion to collagens, and significantly, function blockade of α2 integrin abrogated the pro-modeling influence of TNF-α. Dual-IF on brain tissue with the pericyte marker NG2 showed that while α1 integrin was expressed by pericytes in both stable and remodeling vessels, pericyte expression of α2 integrin was strongly induced in remodeling vessels in EAE brain. Conclusions Our results suggest a model in which ECM constituents exert an important influence on pericyte remodeling status. In this model, HSPG restricts pericyte remodeling in stable vessels, but during inflammation, TNF-α triggers a switch in pericyte integrins from α1 to α2, thereby stimulating pericyte proliferation and migration on collagen. These results thus define a fundamental molecular mechanism in which TNF-α stimulates pericyte remodeling in an α2 integrin-dependent manner.
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Affiliation(s)
- Ulrich Tigges
- Department of Molecular and Experimental Medicine, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla CA, 92037, USA
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94
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Nissinen L, Koivunen J, Käpylä J, Salmela M, Nieminen J, Jokinen J, Sipilä K, Pihlavisto M, Pentikäinen OT, Marjamäki A, Heino J. Novel α2β1 integrin inhibitors reveal that integrin binding to collagen under shear stress conditions does not require receptor preactivation. J Biol Chem 2012; 287:44694-702. [PMID: 23132859 DOI: 10.1074/jbc.m111.309450] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The interaction between α2β1 integrin (GPIa/IIa, VLA-2) and vascular collagen is one of the initiating events in thrombus formation. Here, we describe two structurally similar sulfonamide derivatives, BTT-3033 and BTT-3034, and show that, under static conditions, they have an almost identical effect on α2-expressing CHO cell adhesion to collagen I, but only BTT-3033 blocks platelet attachment under flow (90 dynes/cm(2)). Differential scanning fluorimetry showed that both molecules bind to the α2I domain of the recombinant α2 subunit. To further study integrin binding mechanism(s) of the two sulfonamides, we created an α2 Y285F mutant containing a substitution near the metal ion-dependent adhesion site motif in the α2I domain. The action of BTT-3033, unlike that of BTT-3034, was dependent on Tyr-285. In static conditions BTT-3034, but not BTT-3033, inhibited collagen binding by an α2 variant carrying a conformationally activating E318W mutation. Conversely, in under flow conditions (90 dynes/cm(2)) BTT-3033, but not BTT-3034, inhibited collagen binding by an α2 variant expressing E336A loss-of-function mutation. Thus, the binding sites for BTT-3033 and BTT-3034 are differentially available in distinct integrin conformations. Therefore, these sulfonamides can be used to study the biological role of different functional stages of α2β1. Furthermore, only the inhibitor that recognized the non-activated conformation of α2β1 integrin under shear stress conditions effectively blocked platelet adhesion, suggesting that the initial interaction between integrin and collagen takes place prior to receptor activation.
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95
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Shi M, Pedchenko V, Greer BH, Van Horn WD, Santoro SA, Sanders CR, Hudson BG, Eichman BF, Zent R, Pozzi A. Enhancing integrin α1 inserted (I) domain affinity to ligand potentiates integrin α1β1-mediated down-regulation of collagen synthesis. J Biol Chem 2012; 287:35139-35152. [PMID: 22888006 DOI: 10.1074/jbc.m112.358648] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Integrin α1β1 binding to collagen IV, which is mediated by the α1-inserted (I) domain, down-regulates collagen synthesis. When unligated, a salt bridge between Arg(287) and Glu(317) is thought to keep this domain in a low affinity conformation. Ligand binding opens the salt bridge leading to a high-affinity conformation. How modulating integrin α1β1 affinity alters collagen homeostasis is unknown. To address this question, we utilized a thermolysin-derived product of the α1α2α1 network of collagen IV (α1α2α1(IV) truncated protomer) that selectively binds integrin α1β1. We show that an E317A substitution enhanced binding to the truncated protomer, consistent with a previous finding that this substitution eliminates the salt bridge. Surprisingly, we show that an R287A substitution did not alter binding, whereas R287E/E317R substitutions enhanced binding to the truncated protomer. NMR spectroscopy and molecular modeling suggested that eliminating the Glu(317) negative charge is sufficient to induce a conformational change toward the open state. Thus, the role played by Glu(317) is largely independent of the salt bridge. We further show that cells expressing E317A or R287E/E317R substitutions have enhanced down-regulation of collagen IV synthesis, which is mediated by the ERK/MAPK pathway. In conclusion, we have demonstrated that modulating the affinity of the extracellular α1 I domain to collagen IV enhances outside-in signaling by potentiating ERK activation and enhancing the down-regulation of collagen synthesis.
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Affiliation(s)
- Mingjian Shi
- Department of Medicine (Nephrology), Vanderbilt University, Nashville, Tennessee 37232
| | - Vadim Pedchenko
- Department of Medicine (Nephrology), Vanderbilt University, Nashville, Tennessee 37232; Center for Matrix Biology, Vanderbilt University, Nashville, Tennessee 37232
| | - Briana H Greer
- Center for Structural Biology, Vanderbilt University, Nashville, Tennessee 37232; Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37232
| | - Wade D Van Horn
- Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37232; Department of Biochemistry, Vanderbilt University, Nashville, Tennessee 37232
| | - Samuel A Santoro
- Center for Matrix Biology, Vanderbilt University, Nashville, Tennessee 37232; Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, Tennessee 37232
| | - Charles R Sanders
- Center for Matrix Biology, Vanderbilt University, Nashville, Tennessee 37232; Center for Structural Biology, Vanderbilt University, Nashville, Tennessee 37232; Department of Biochemistry, Vanderbilt University, Nashville, Tennessee 37232
| | - Billy G Hudson
- Department of Medicine (Nephrology), Vanderbilt University, Nashville, Tennessee 37232; Center for Matrix Biology, Vanderbilt University, Nashville, Tennessee 37232; Department of Biochemistry, Vanderbilt University, Nashville, Tennessee 37232
| | - Brandt F Eichman
- Center for Matrix Biology, Vanderbilt University, Nashville, Tennessee 37232; Center for Structural Biology, Vanderbilt University, Nashville, Tennessee 37232; Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37232; Department of Biochemistry, Vanderbilt University, Nashville, Tennessee 37232
| | - Roy Zent
- Department of Medicine (Nephrology), Vanderbilt University, Nashville, Tennessee 37232; Center for Matrix Biology, Vanderbilt University, Nashville, Tennessee 37232; Department of Medicine, Veterans Affairs Medical Center, Nashville, Tennessee 37212
| | - Ambra Pozzi
- Department of Medicine (Nephrology), Vanderbilt University, Nashville, Tennessee 37232; Center for Matrix Biology, Vanderbilt University, Nashville, Tennessee 37232; Department of Medicine, Veterans Affairs Medical Center, Nashville, Tennessee 37212.
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96
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Singh B, Fleury C, Jalalvand F, Riesbeck K. Human pathogens utilize host extracellular matrix proteins laminin and collagen for adhesion and invasion of the host. FEMS Microbiol Rev 2012; 36:1122-80. [PMID: 22537156 DOI: 10.1111/j.1574-6976.2012.00340.x] [Citation(s) in RCA: 206] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2011] [Revised: 02/08/2012] [Accepted: 03/29/2012] [Indexed: 01/11/2023] Open
Abstract
Laminin (Ln) and collagen are multifunctional glycoproteins that play an important role in cellular morphogenesis, cell signalling, tissue repair and cell migration. These proteins are ubiquitously present in tissues as a part of the basement membrane (BM), constitute a protective layer around blood capillaries and are included in the extracellular matrix (ECM). As a component of BMs, both Lns and collagen(s), thus function as major mechanical containment molecules that protect tissues from pathogens. Invasive pathogens breach the basal lamina and degrade ECM proteins of interstitial spaces and connective tissues using various ECM-degrading proteases or surface-bound plasminogen and matrix metalloproteinases recruited from the host. Most pathogens associated with the respiratory, gastrointestinal, or urogenital tracts, as well as with the central nervous system or the skin, have the capacity to bind and degrade Lns and collagen(s) in order to adhere to and invade host tissues. In this review, we focus on the adaptability of various pathogens to utilize these ECM proteins as enhancers for adhesion to host tissues or as a targets for degradation in order to breach the cellular barriers. The major pathogens discussed are Streptococcus, Staphylococcus, Pseudomonas, Salmonella, Yersinia, Treponema, Mycobacterium, Clostridium, Listeria, Porphyromonas and Haemophilus; Candida, Aspergillus, Pneumocystis, Cryptococcus and Coccidioides; Acanthamoeba, Trypanosoma and Trichomonas; retrovirus and papilloma virus.
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Affiliation(s)
- Birendra Singh
- Medical Microbiology, Department of Laboratory Medicine Malmö, Skåne University Hospital, Lund University, Malmö, Sweden
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97
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Hamaia SW, Pugh N, Raynal N, Némoz B, Stone R, Gullberg D, Bihan D, Farndale RW. Mapping of potent and specific binding motifs, GLOGEN and GVOGEA, for integrin α1β1 using collagen toolkits II and III. J Biol Chem 2012; 287:26019-28. [PMID: 22654115 PMCID: PMC3406685 DOI: 10.1074/jbc.m112.353144] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Integrins are well characterized cell surface receptors for extracellular matrix proteins. Mapping integrin-binding sites within the fibrillar collagens identified GFOGER as a high affinity site recognized by α2β1, but with lower affinity for α1β1. Here, to identify specific ligands for α1β1, we examined binding of the recombinant human α1 I domain, the rat pheochromocytoma cell line (PC12), and the rat glioma Rugli cell line to our collagen Toolkit II and III peptides using solid-phase and real-time label-free adhesion assays. We observed Mg2+-dependent binding of the α1 I domain to the peptides in the following rank order: III-7 (GLOGEN), II-28 (GFOGER), II-7 and II-8 (GLOGER), II-18 (GAOGER), III-4 (GROGER). PC12 cells showed a similar profile. Using antibody blockade, we confirmed that binding of PC12 cells to peptide III-7 was mediated by integrin α1β1. We also identified a new α1β1-binding activity within peptide II-27. The sequence GVOGEA bound weakly to PC12 cells and strongly to activated Rugli cells or to an activated α1 I domain, but not to the α2 I domain or to C2C12 cells expressing α2β1 or α11β1. Thus, GVOGEA is specific for α1β1. Although recognized by both α2β1 and α11β1, GLOGEN is a better ligand for α1β1 compared with GFOGER. Finally, using biosensor assays, we show that although GLOGEN is able to compete for the α1 I domain from collagen IV (IC50 ∼3 μm), GFOGER is much less potent (IC50 ∼90 μm), as shown previously. These data confirm the selectivity of GFOGER for α2β1 and establish GLOGEN as a high affinity site for α1β1.
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Affiliation(s)
- Samir W Hamaia
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1QW, United Kingdom
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98
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Abstract
The extracellular matrix (ECM) provides a solid scaffold and signals to cells through ECM receptors. The cell-matrix interactions are crucial for normal biological processes and when disrupted they may lead to pathological processes. In particular, the biological importance of ECM-cell membrane-cytoskeleton interactions in skeletal muscle is accentuated by the number of inherited muscle diseases caused by mutations in proteins conferring these interactions. In this review we introduce laminins, collagens, dystroglycan, integrins, dystrophin and sarcoglycans. Mutations in corresponding genes cause various forms of muscular dystrophy. The muscle disorders are presented as well as advances toward the development of treatment.
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Affiliation(s)
- Virginie Carmignac
- Muscle Biology Unit, Department of Experimental Medical Science, Lund University, Lund, Sweden
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99
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Blumbach K, Niehoff A, Belgardt BF, Ehlen HWA, Schmitz M, Hallinger R, Schulz JN, Brüning JC, Krieg T, Schubert M, Gullberg D, Eckes B. Dwarfism in mice lacking collagen-binding integrins α2β1 and α11β1 is caused by severely diminished IGF-1 levels. J Biol Chem 2011; 287:6431-40. [PMID: 22210772 DOI: 10.1074/jbc.m111.283119] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Mice with a combined deficiency in the α2β1 and α11β1 integrins lack the major receptors for collagen I. These mutants are born with inconspicuous differences in size but develop dwarfism within the first 4 weeks of life. Dwarfism correlates with shorter, less mineralized and functionally weaker bones that do not result from growth plate abnormalities or osteoblast dysfunction. Besides skeletal dwarfism, internal organs are correspondingly smaller, indicating proportional dwarfism and suggesting a systemic cause for the overall size reduction. In accordance with a critical role of insulin-like growth factor (IGF)-1 in growth control and bone mineralization, circulating IGF-1 levels in the sera of mice lacking either α2β1 or α11β1 or both integrins were sharply reduced by 39%, 64%, or 81% of normal levels, respectively. Low hepatic IGF-1 production resulted from diminished growth hormone-releasing hormone expression in the hypothalamus and, subsequently, reduced growth hormone expression in the pituitary glands of these mice. These findings point out a novel role of collagen-binding integrin receptors in the control of growth hormone/IGF-1-dependent biological activities. Thus, coupling hormone secretion to extracellular matrix signaling via integrins represents a novel concept in the control of endocrine homeostasis.
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Affiliation(s)
- Katrin Blumbach
- Department of Dermatology, University of Cologne, 50937 Cologne, Germany
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100
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Lahti M, Bligt E, Niskanen H, Parkash V, Brandt AM, Jokinen J, Patrikainen P, Käpylä J, Heino J, Salminen TA. Structure of collagen receptor integrin α(1)I domain carrying the activating mutation E317A. J Biol Chem 2011; 286:43343-51. [PMID: 22030389 PMCID: PMC3234817 DOI: 10.1074/jbc.m111.261909] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Revised: 10/07/2011] [Indexed: 11/06/2022] Open
Abstract
We have analyzed the structure and function of the integrin α(1)I domain harboring a gain-of-function mutation E317A. To promote protein crystallization, a double variant with an additional C139S mutation was used. In cell adhesion assays, the E317A mutation promoted binding to collagen. Similarly, the double mutation C139S/E317A increased adhesion compared with C139S alone. Furthermore, soluble α(1)I C139S/E317A was a higher avidity collagen binder than α(1)I C139S, indicating that the double variant represents an activated form. The crystal structure of the activated variant of α(1)I was solved at 1.9 Å resolution. The E317A mutation results in the unwinding of the αC helix, but the metal ion has moved toward loop 1, instead of loop 2 in the open α(2)I. Furthermore, unlike in the closed αI domains, the metal ion is pentacoordinated and, thus, prepared for ligand binding. Helix 7, which has moved downward in the open α(2)I structure, has not changed its position in the activated α(1)I variant. During the integrin activation, Glu(335) on helix 7 binds to the metal ion at the metal ion-dependent adhesion site (MIDAS) of the β(1) subunit. Interestingly, in our cell adhesion assays E317A could activate collagen binding even after mutating Glu(335). This indicates that the stabilization of helix 7 into its downward position is not required if the α(1) MIDAS is already open. To conclude, the activated α(1)I domain represents a novel conformation of the αI domain, mimicking the structural state where the Arg(287)-Glu(317) ion pair has just broken during the integrin activation.
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Affiliation(s)
- Matti Lahti
- From the Department of Biochemistry and Food Chemistry, University of Turku, Turku FI-20014, Finland and
| | - Eva Bligt
- the Structural Bioinformatics Laboratory, Department of Biosciences, Åbo Akademi University, Turku FI-20520, Finland
| | - Henri Niskanen
- From the Department of Biochemistry and Food Chemistry, University of Turku, Turku FI-20014, Finland and
| | - Vimal Parkash
- the Structural Bioinformatics Laboratory, Department of Biosciences, Åbo Akademi University, Turku FI-20520, Finland
| | - Anna-Maria Brandt
- the Structural Bioinformatics Laboratory, Department of Biosciences, Åbo Akademi University, Turku FI-20520, Finland
| | - Johanna Jokinen
- From the Department of Biochemistry and Food Chemistry, University of Turku, Turku FI-20014, Finland and
| | - Pekka Patrikainen
- From the Department of Biochemistry and Food Chemistry, University of Turku, Turku FI-20014, Finland and
| | - Jarmo Käpylä
- From the Department of Biochemistry and Food Chemistry, University of Turku, Turku FI-20014, Finland and
| | - Jyrki Heino
- From the Department of Biochemistry and Food Chemistry, University of Turku, Turku FI-20014, Finland and
| | - Tiina A. Salminen
- the Structural Bioinformatics Laboratory, Department of Biosciences, Åbo Akademi University, Turku FI-20520, Finland
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