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Kapustin A, Tsakali SS, Whitehead M, Chennell G, Wu MY, Molenaar C, Kutikhin A, Bogdanov L, Sinitsky M, Rubina K, Clayton A, Verweij FJ, Pegtel DM, Zingaro S, Lobov A, Zainullina B, Owen D, Parsons M, Cheney RE, Warren D, Humphries MJ, Iskratsch T, Holt M, Shanahan CM. Extracellular vesicles stimulate smooth muscle cell migration by presenting collagen VI. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.08.17.551257. [PMID: 37645762 PMCID: PMC10462164 DOI: 10.1101/2023.08.17.551257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/31/2023]
Abstract
The extracellular matrix (ECM) supports blood vessel architecture and functionality and undergoes active remodelling during vascular repair and atherogenesis. Vascular smooth muscle cells (VSMCs) are essential for vessel repair and, via their secretome, are able to invade from the vessel media into the intima to mediate ECM remodelling. Accumulation of fibronectin (FN) is a hallmark of early vascular repair and atherosclerosis and here we show that FN stimulates VSMCs to secrete small extracellular vesicles (sEVs) by activating the β1 integrin/FAK/Src pathway as well as Arp2/3-dependent branching of the actin cytoskeleton. Spatially, sEV were secreted via filopodia-like cellular protrusions at the leading edge of migrating cells. We found that sEVs are trapped by the ECM in vitro and colocalise with FN in symptomatic atherosclerotic plaques in vivo. Functionally, ECM-trapped sEVs induced the formation of focal adhesions (FA) with enhanced pulling forces at the cellular periphery. Proteomic and GO pathway analysis revealed that VSMC-derived sEVs display a cell adhesion signature and are specifically enriched with collagen VI. In vitro assays identified collagen VI as playing the key role in cell adhesion and invasion. Taken together our data suggests that the accumulation of FN is a key early event in vessel repair acting to promote secretion of collage VI enriched sEVs by VSMCs. These sEVs stimulate migration and invasion by triggering peripheral focal adhesion formation and actomyosin contraction to exert sufficient traction forces to enable VSMC movement within the complex vascular ECM network.
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Affiliation(s)
- Alexander Kapustin
- School of Cardiovascular and Metabolic Medicine & Sciences, James Black Centre, King's College London, 125 Coldharbour Lane, London, SE5 9NU, UK, Tel. 020 7848 5221, FAX 020 7848 5193
| | - Sofia Serena Tsakali
- School of Cardiovascular and Metabolic Medicine & Sciences, James Black Centre, King's College London, 125 Coldharbour Lane, London, SE5 9NU, UK, Tel. 020 7848 5221, FAX 020 7848 5193
| | - Meredith Whitehead
- School of Cardiovascular and Metabolic Medicine & Sciences, James Black Centre, King's College London, 125 Coldharbour Lane, London, SE5 9NU, UK, Tel. 020 7848 5221, FAX 020 7848 5193
| | - George Chennell
- Wohl Cellular Imaging Centre, King’s College London, 5 Cutcombe Road, London, SE5 9NU
| | - Meng-Ying Wu
- School of Cardiovascular and Metabolic Medicine & Sciences, James Black Centre, King's College London, 125 Coldharbour Lane, London, SE5 9NU, UK, Tel. 020 7848 5221, FAX 020 7848 5193
| | - Chris Molenaar
- School of Cardiovascular and Metabolic Medicine & Sciences, James Black Centre, King's College London, 125 Coldharbour Lane, London, SE5 9NU, UK, Tel. 020 7848 5221, FAX 020 7848 5193
| | - Anton Kutikhin
- Laboratory for Molecular, Translational and Digital Medicine, Research Institute for Complex Issues of Cardiovascular Diseases, 6 Sosnovy Boulevard, Kemerovo, 650002, Russian Federation
| | - Leo Bogdanov
- Laboratory for Molecular, Translational and Digital Medicine, Research Institute for Complex Issues of Cardiovascular Diseases, 6 Sosnovy Boulevard, Kemerovo, 650002, Russian Federation
| | - Maxim Sinitsky
- Laboratory for Molecular, Translational and Digital Medicine, Research Institute for Complex Issues of Cardiovascular Diseases, 6 Sosnovy Boulevard, Kemerovo, 650002, Russian Federation
| | - Kseniya Rubina
- Laboratory of Morphogenesis and Tissue Reparation, Faculty of Medicine, Lomonosov Moscow State University, Lomonosovsky av. 27-1, Moscow, 119991, Russia, tel/fax +74959329904
| | - Aled Clayton
- Tissue Microenvironment Research Group, Division of Cancer & Genetics, School of Medicine, Cardiff University, Tenovus Building, Cardiff, UK, CF14 2XN
| | - Frederik J Verweij
- Division of Cell Biology, Neurobiology & Biophysics, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands
| | - Dirk Michiel Pegtel
- Amsterdam UMC, Location Vrije Universiteit Amsterdam, Department of Pathology, Cancer Center Amsterdam, De Boelelaan 1117, Amsterdam, The Netherlands
| | - Simona Zingaro
- Randall Centre for Cell and Molecular Biophysics, School of Basic and Medical Biosciences, King's College London, New Hunt's House, Guy's Campus, London, SE1 1UL UK
| | - Arseniy Lobov
- Laboratory of Regenerative Biomedicine, Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretskiy Prospekt, 194064, St. Petersburg, Russia
| | - Bozhana Zainullina
- Centre for Molecular and Cell Technologies, Research Park, St. Petersburg State University, 7/9 Universitetskaya Embankment, 199034, St. Petersburg, Russia
| | - Dylan Owen
- Institute of Immunology and Immunotherapy, School of Mathematics and Centre of Membrane Proteins and Receptors (COMPARE), University of Birmingham, Birmingham, B15 2TT, UK
| | - Maddy Parsons
- Randall Centre for Cell and Molecular Biophysics, School of Basic and Medical Biosciences, King's College London, New Hunt's House, Guy's Campus, London, SE1 1UL UK
| | - Richard E. Cheney
- Department of Cell Biology and Physiology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Derek Warren
- School of Pharmacy, University of East Anglia, Norwich Research Park, Norwich, Norfolk, UK, NR4 7TJ
| | - Martin James Humphries
- Wellcome Centre for Cell-Matrix Research, Faculty of Biology, Medicine & Health, Manchester Academic Health Science Centre, University of Manchester, Michael Smith Building, Oxford Road, Manchester, M13 9PT, United Kingdom
| | - Thomas Iskratsch
- School of Engineering and Materials Science, Faculty of Science and Engineering, Queen Mary University of London, Engineering Building, Mile End Road, E1 4NS
| | - Mark Holt
- Amsterdam UMC, Location Vrije Universiteit Amsterdam, Department of Pathology, Cancer Center Amsterdam, De Boelelaan 1117, Amsterdam, The Netherlands
| | - Catherine M Shanahan
- School of Cardiovascular and Metabolic Medicine & Sciences, James Black Centre, King's College London, 125 Coldharbour Lane, London, SE5 9NU, UK, Tel. 020 7848 5221, FAX 020 7848 5193
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Fuentes P, Sesé M, Guijarro PJ, Emperador M, Sánchez-Redondo S, Peinado H, Hümmer S, Ramón Y Cajal S. ITGB3-mediated uptake of small extracellular vesicles facilitates intercellular communication in breast cancer cells. Nat Commun 2020; 11:4261. [PMID: 32848136 PMCID: PMC7450082 DOI: 10.1038/s41467-020-18081-9] [Citation(s) in RCA: 76] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Accepted: 07/31/2020] [Indexed: 11/08/2022] Open
Abstract
Metastasis, the spread of malignant cells from a primary tumour to distant sites, causes 90% of cancer-related deaths. The integrin ITGB3 has been previously described to play an essential role in breast cancer metastasis, but the precise mechanisms remain undefined. We have now uncovered essential and thus far unknown roles of ITGB3 in vesicle uptake. The functional requirement for ITGB3 derives from its interactions with heparan sulfate proteoglycans (HSPGs) and the process of integrin endocytosis, allowing the capture of extracellular vesicles and their endocytosis-mediated internalization. Key for the function of ITGB3 is the interaction and activation of focal adhesion kinase (FAK), which is required for endocytosis of these vesicles. Thus, ITGB3 has a central role in intracellular communication via extracellular vesicles, proposed to be critical for cancer metastasis.
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Affiliation(s)
- Pedro Fuentes
- Translational Molecular Pathology, Vall d'Hebron Research Institute (VHIR), Universitat Autònoma de Barcelona (UAB), Barcelona, Spain
- Spanish Biomedical Research Network Centre in Oncology (CIBERONC), Madrid, Spain
| | - Marta Sesé
- Translational Molecular Pathology, Vall d'Hebron Research Institute (VHIR), Universitat Autònoma de Barcelona (UAB), Barcelona, Spain
- Spanish Biomedical Research Network Centre in Oncology (CIBERONC), Madrid, Spain
| | - Pedro J Guijarro
- Translational Molecular Pathology, Vall d'Hebron Research Institute (VHIR), Universitat Autònoma de Barcelona (UAB), Barcelona, Spain
| | - Marta Emperador
- Translational Molecular Pathology, Vall d'Hebron Research Institute (VHIR), Universitat Autònoma de Barcelona (UAB), Barcelona, Spain
- Tumor Biomarkers Group, Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain
| | - Sara Sánchez-Redondo
- Microenvironment & Metastasis Group, Molecular Oncology Program, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Héctor Peinado
- Microenvironment & Metastasis Group, Molecular Oncology Program, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Stefan Hümmer
- Translational Molecular Pathology, Vall d'Hebron Research Institute (VHIR), Universitat Autònoma de Barcelona (UAB), Barcelona, Spain.
- Spanish Biomedical Research Network Centre in Oncology (CIBERONC), Madrid, Spain.
| | - Santiago Ramón Y Cajal
- Translational Molecular Pathology, Vall d'Hebron Research Institute (VHIR), Universitat Autònoma de Barcelona (UAB), Barcelona, Spain.
- Spanish Biomedical Research Network Centre in Oncology (CIBERONC), Madrid, Spain.
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Akhshi TK, Wernike D, Piekny A. Microtubules and actin crosstalk in cell migration and division. Cytoskeleton (Hoboken) 2013; 71:1-23. [DOI: 10.1002/cm.21150] [Citation(s) in RCA: 110] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 10/02/2013] [Accepted: 10/06/2013] [Indexed: 12/22/2022]
Affiliation(s)
| | - Denise Wernike
- Department of Biology; Concordia University; Montreal Quebec Canada
| | - Alisa Piekny
- Department of Biology; Concordia University; Montreal Quebec Canada
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Wolfenson H, Henis YI, Geiger B, Bershadsky AD. The heel and toe of the cell's foot: a multifaceted approach for understanding the structure and dynamics of focal adhesions. ACTA ACUST UNITED AC 2010; 66:1017-29. [PMID: 19598236 DOI: 10.1002/cm.20410] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Focal adhesions (FAs) are large clusters of transmembrane receptors of the integrin family and a multitude of associated cytoplasmic "plaque" proteins, which connect the extracellular matrix-bound receptors with the actin cytoskeleton. The formation of nearly stationary FAs defines a boundary between the dense and highly dynamic actin network in lamellipodium and the sparser and more diverse cytoskeletal organization in the lamella proper, creating a template for the organization of the entire actin network. The major "mechanical" and "sensory" functions of FAs; namely, the nucleation and regulation of the contractile, myosin-II-containing stress fibers and the mechanosensing of external surfaces depend, to a major extent, on the dynamics of molecular components within FAs. A central element in FA regulation concerns the positive feedback loop, based on the most intriguing feature of FAs; that is, their dependence on mechanical tension developing by the growing stress fibers. FAs grow in response to such tension, and rapidly disassemble upon its relaxation. In this article, we address the mechanistic relationships between the process of FA development, maturation and dissociation and the dynamic molecular events, which take place in different regions of the FA, primarily in the distal end of this structure (the "toe") and the proximal "heel," and discuss the central role of local mechanical forces in orchestrating the complex interplay between FAs and the actin system.
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Affiliation(s)
- Haguy Wolfenson
- Department of Neurobiology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
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Ezratty EJ, Bertaux C, Marcantonio EE, Gundersen GG. Clathrin mediates integrin endocytosis for focal adhesion disassembly in migrating cells. ACTA ACUST UNITED AC 2010; 187:733-47. [PMID: 19951918 PMCID: PMC2806590 DOI: 10.1083/jcb.200904054] [Citation(s) in RCA: 258] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Focal adhesion disassembly is regulated by microtubules (MTs) through an unknown mechanism that involves dynamin. To test whether endocytosis may be involved, we interfered with the function of clathrin or its adaptors autosomal recessive hypercholesteremia (ARH) and Dab2 (Disabled-2) and found that both treatments prevented MT-induced focal adhesion disassembly. Surface labeling experiments showed that integrin was endocytosed in an extracellular matrix-, clathrin-, and ARH- and Dab2-dependent manner before entering Rab5 endosomes. Clathrin colocalized with a subset of focal adhesions in an ARH- and Dab2-dependent fashion. Direct imaging showed that clathrin rapidly accumulated on focal adhesions during MT-stimulated disassembly and departed from focal adhesions with integrin upon their disassembly. In migrating cells, depletion of clathrin or Dab2 and ARH inhibited focal adhesion disassembly and decreased the rate of migration. These results show that focal adhesion disassembly occurs through a targeted mechanism involving MTs, clathrin, and specific clathrin adaptors and that direct endocytosis of integrins from focal adhesions mediates their disassembly in migrating cells.
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Affiliation(s)
- Ellen J Ezratty
- Department of Pathology and Cell Biology, Columbia University, New York, NY 10032, USA
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Yan HHN, Mruk DD, Lee WM, Cheng CY. Cross-talk between tight and anchoring junctions-lesson from the testis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2009; 636:234-54. [PMID: 19856171 DOI: 10.1007/978-0-387-09597-4_13] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Spermatogenesis takes place in the seminiferous tubules in adult testes such as rats, in which developing germ cells must traverse the seminiferous epithelium while spermatogonia (2n, diploid) undergo mitotic and meiotic divisions, and differentiate into elongated spermatids (1n, haploid). It is conceivable that this event involves extensive junction restructuring particularly at the blood-testis barrier (BTB, a structure that segregates the seminiferous epithelium into the basal and the adluminal compartments) that occurs at stages VII-VIII of the seminiferous epithelial cycle. As such, cross-talk between tight (TJ) and anchoring junctions [e.g., basal ectoplasmic specialization (basal ES), adherens junction (AJ), desmosome-like junction (DJ)] at the BTB must occur to coordinate the transient opening of the BTB to facilitate preleptotene spermatocyte migration. Interestingly, while there are extensively restructuring at the BTB during the epithelial cycle, the immunological barrier function of the BTB must be maintained without disruption even transiently. Recent studies using the androgen suppression and Adjudin models have shown that anchoring junction restructuring that leads to germ cell loss from the seminiferous epithelium also promotes the production of AJ (e.g., basal ES) proteins (such as N-cadherins, catenins) at the BTB site. We postulate the testis is using a similar mechanism during spermatogenesis at stage VIII of the epithelial cycle that these induced basal ES proteins, likely form a "patch" surrounding the BTB, transiently maintain the BTB integrity while TJ is "opened", such as induced by TGF-b3 or TNFa, to facilitate preleptotene spermatocyte migration. However, in other stages of the epithelial cycle other than VII and VIII when the BTB remains "closed" (for approximately 10 days), anchoring junctions (e.g., AJ, DJ, and apical ES) restructuring continues to facilitate germ cell movement. Interestingly, the mechanism(s) that governs this communication between TJ and anchoring junction (e.g., basal ES and AJ) in the testis has remained obscure until recently. Herein, we provide a critical review based on the recently available data regarding the cross-talk between TJ and anchoring junction to allow simultaneous maintenance of the BTB and germ cell movement across the seminiferous epithelium.
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Affiliation(s)
- Helen H N Yan
- Center for Biomedical Research, The Population Council, New York, NY 10021, USA.
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Abstract
The availability of multi-photon intravital microscopy has recently allowed researchers to start to visualise the dynamic behaviour of cancer cells in vivo. This imaging has revealed that many cancer cells ranging from carcinoma to melanoma move in an amoeboid manner in order to invade surrounding tissue and escape from the primary tumour. This mode on cell motility is extremely rapid and does not require the activity of proteases to degrade the extra-cellular matrix (ECM). This review details the techniques that are available to study cell motility in vivo and discusses the current knowledge about the mechanisms of amoeboid cell motility.
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Affiliation(s)
- S Pinner
- Tumour Cell Biology Laboratory, Cancer Research UK London Research Institute, 44 Lincoln's Inn Fields, LONDON WC2A 3PX, United Kingdom.
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Vassilieva EV, Gerner-Smidt K, Ivanov AI, Nusrat A. Lipid rafts mediate internalization of beta1-integrin in migrating intestinal epithelial cells. Am J Physiol Gastrointest Liver Physiol 2008; 295:G965-76. [PMID: 18755811 PMCID: PMC2584823 DOI: 10.1152/ajpgi.00082.2008] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Intestinal mucosal inflammation is associated with epithelial wounds that rapidly reseal by migration of intestinal epithelial cells (IECs). Cell migration involves cycles of cell-matrix adhesion/deadhesion that is mediated by dynamic turnover (assembly and disassembly) of integrin-based focal adhesions. Integrin endocytosis appears to be critical for deadhesion of motile cells. However, mechanisms of integrin internalization during remodeling of focal adhesions of migrating IECs are not understood. This study was designed to define the endocytic pathway that mediates internalization of beta(1)-integrin in migrating model IECs. We observed that, in SK-CO15 and T84 colonic epithelial cells, beta(1)-integrin is internalized in a dynamin-dependent manner. Pharmacological inhibition of clathrin-mediated endocytosis or macropinocytosis and small-interfering RNA (siRNA)-mediated knock down of clathrin did not prevent beta(1)-integrin internalization. However, beta(1)-integrin internalization was inhibited following cholesterol extraction and after overexpression of lipid raft protein, caveolin-1. Furthermore, internalized beta(1)-integrin colocalized with the lipid rafts marker cholera toxin, and siRNA-mediated knockdown of caveolin-1 and flotillin-1/2 increased beta(1)-integrin endocytosis. Our data suggest that, in migrating IEC, beta(1)-integrin is internalized via a dynamin-dependent lipid raft-mediated pathway. Such endocytosis is likely to be important for disassembly of integrin-based cell-matrix adhesions and therefore in regulating IEC migration and wound closure.
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Affiliation(s)
- Elena V. Vassilieva
- Epithelial Pathobiology Research Unit, Department of Pathology and Laboratory Medicine, Emory University, Atlanta, Georgia; and Gastroenterology and Hepatology Division, Department of Medicine, The University of Rochester School of Medicine and Dentistry, Rochester, New York
| | - Kirsten Gerner-Smidt
- Epithelial Pathobiology Research Unit, Department of Pathology and Laboratory Medicine, Emory University, Atlanta, Georgia; and Gastroenterology and Hepatology Division, Department of Medicine, The University of Rochester School of Medicine and Dentistry, Rochester, New York
| | - Andrei I. Ivanov
- Epithelial Pathobiology Research Unit, Department of Pathology and Laboratory Medicine, Emory University, Atlanta, Georgia; and Gastroenterology and Hepatology Division, Department of Medicine, The University of Rochester School of Medicine and Dentistry, Rochester, New York
| | - Asma Nusrat
- Epithelial Pathobiology Research Unit, Department of Pathology and Laboratory Medicine, Emory University, Atlanta, Georgia; and Gastroenterology and Hepatology Division, Department of Medicine, The University of Rochester School of Medicine and Dentistry, Rochester, New York
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Kaneda T, Sonoda Y, Ando K, Suzuki T, Sasaki Y, Oshio T, Tago M, Kasahara T. Mutation of Y925F in focal adhesion kinase (FAK) suppresses melanoma cell proliferation and metastasis. Cancer Lett 2008; 270:354-61. [PMID: 18606490 DOI: 10.1016/j.canlet.2008.05.042] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2008] [Revised: 05/20/2008] [Accepted: 05/23/2008] [Indexed: 01/04/2023]
Abstract
This study focused on the role of focal adhesion kinase (FAK), a cytoplasmic tyrosine kinase important for many cellular processes, in the proliferation, adhesion, and invasion of melanoma cells in vitro and in vivo. We found that the Y925F-mutation of FAK in B16F10 melanoma cells suppressed metastasis in an experimental model, which correlated well with decreased extracellular matrix dependent proliferative capability, adhesive, migrational, and invasive capabilities. Transduction of the mutation Y925F resulted in a down-regulation of the phosphorylation of Erk, the expression of VEGF, and the association of FAK with paxillin. The results provide clear evidence that 925Y of FAK is critical for melanoma metastasis and this phosphorylation site will be an anti-metastatic target.
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Affiliation(s)
- Tomonori Kaneda
- Faculty of Pharmacy, Keio University, Shibakoen 1-5-30, Minato-ku, Tokyo 105-8512, Japan
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Abstract
Cell adhesion, migration and the maintenance of cell polarity are all processes that depend on the correct targeting of integrins and the dynamic remodelling of integrin-containing adhesion sites. The importance of the endo/exocytic cycle of integrins as a key regulator of these functions is increasingly recognized. Several recent publications have provided mechanistic insight into how integrin traffic is regulated in cells. Increasing evidence suggests that small GTPases such as Arf6 and members of the Rab family control integrin internalization and recycling back to the plasma membrane along microtubules. The fine tuning of these trafficking events seems to be mediated by specific guanine-nucleotide-exchange factors (GEFs) and GTPase-activating proteins (GAPs). In addition, several kinases regulate integrin traffic. The identification of their substrates has demonstrated how these kinases regulate integrin traffic by controlling small GTPases or stabilizing cytoskeletal tracks that are crucial for efficient traffic of integrins to the plasma membrane.
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Gold LI, Rahman M, Blechman KM, Greives MR, Churgin S, Michaels J, Callaghan MJ, Cardwell NL, Pollins AC, Michalak M, Siebert JW, Levine JP, Gurtner GC, Nanney LB, Galiano RD, Cadacio CL. Overview of the role for calreticulin in the enhancement of wound healing through multiple biological effects. J Investig Dermatol Symp Proc 2006; 11:57-65. [PMID: 17069011 DOI: 10.1038/sj.jidsymp.5650011] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Calreticulin (CRT), an intracellular chaperone protein crucial for the proper folding and transport of proteins through the endoplasmic reticulum, has more recent acclaim as a critical regulator of extracellular functions, particularly in mediating cellular migration and as a requirement for phagocytosis of apoptotic cells. Consistent with these functions, we show that the topical application of CRT has profound effects on the process of wound healing by causing a dose-dependent increase in epithelial migration and granulation tissue formation in both murine and porcine normal and impaired animal models of skin injury. These effects of CRTare substantiated, in vitro, as we show that CRT strongly induces cell migration/wound closure of human keratinocytes and fibroblasts, using a wound/scratch plate assay, and stimulates cellular proliferation of human keratinocytes, fibroblasts, and vascular endothelial cells, providing mechanistic insight into how CRT functions in repair. Similarly, in both animal models, the histology of the wounds show marked proliferation of basal keratinocytes and dermal fibroblasts, dense cellularity of the dermis with notably increased numbers of macrophages and well-organized collagen fibril deposition. Thus, CRT profoundly affects the wound healing process by recruiting cells essential for repair into the wound, stimulating cell growth, and increasing extracellular matrix production.
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Affiliation(s)
- Leslie I Gold
- Department of Medicine, New York University School of Medicine, New York, New York 10016, USA.
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Lee SY, Kim YT, Lee MS, Kim YB, Chung E, Kim S, Lee JW. Focal adhesion and actin organization by a cross-talk of TM4SF5 with integrin alpha2 are regulated by serum treatment. Exp Cell Res 2006; 312:2983-99. [PMID: 16828471 DOI: 10.1016/j.yexcr.2006.06.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2006] [Revised: 05/18/2006] [Accepted: 06/02/2006] [Indexed: 11/29/2022]
Abstract
The biological functions of transmembrane 4 L6 family member 5 (TM4SF5) homologues to a tumor-associated antigen L6 are unknown, although it is over-expressed in certain forms of cancer. In the present study, the ectopic expression of TM4SF5 in Cos7 cells reduced integrin signaling under serum-containing conditions, but increased integrin signaling upon serum-free replating on substrates. TM4SF5 regulated actin organization and focal contact dynamics via the serum treatment-dependent differential regulation of FAK Tyr925 and paxillin Tyr118 phosphorylations and their localizations on peripheral cell boundaries. Y925F FAK mutation abolished the TM4SF5 effects. TM4SF5 associated with integrin alpha2 subunit, and this association was abolished by serum treatment. Furthermore, functional blocking anti-integrin alpha2 antibody abolished TM4SF5-enhanced signaling activity and caused membrane blebbing with abnormal actin organization. TM4SF5 increased chemotactic but decreased haptotactic migration. Altogether, this study reveals the functions of TM4SF5 collaborative with integrin signaling to alter focal contact dynamics, actin reorganization, and migration. Furthermore, this study suggests a mechanism of cross-talk between TM4SF5 and integrin which is further regulated by growth factor signaling.
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Affiliation(s)
- Sung-Yul Lee
- Cancer Research Institute, Department of Molecular and Clinical Oncology, College of Medicine, Seoul National University, 28, Yeongeon-dong, Jongno-gu, Seoul 110-799, Korea
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Perrin BJ, Amann KJ, Huttenlocher A. Proteolysis of cortactin by calpain regulates membrane protrusion during cell migration. Mol Biol Cell 2005; 17:239-50. [PMID: 16280362 PMCID: PMC1345662 DOI: 10.1091/mbc.e05-06-0488] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Calpain 2 regulates membrane protrusion during cell migration. However, relevant substrates that mediate the effects of calpain on protrusion have not been identified. One potential candidate substrate is the actin binding protein cortactin. Cortactin is a Src substrate that drives actin polymerization by activating the Arp2/3 complex and also stabilizes the cortical actin network. We now provide evidence that proteolysis of cortactin by calpain 2 regulates membrane protrusion dynamics during cell migration. We show that cortactin is a calpain 2 substrate in fibroblasts and that the preferred cleavage site occurs in a region between the actin binding repeats and the alpha-helical domain. We have generated a mutant cortactin that is resistant to calpain proteolysis but retains other biochemical properties of cortactin. Expression of the calpain-resistant cortactin, but not wild-type cortactin, impairs cell migration and increases transient membrane protrusion, suggesting that calpain proteolysis of cortactin limits membrane protrusions and regulates migration in fibroblasts. Furthermore, the enhanced protrusion observed with the calpain-resistant cortactin requires both the Arp2/3 binding site and the Src homology 3 domain of cortactin. Together, these findings suggest a novel role for calpain-mediated proteolysis of cortactin in regulating membrane protrusion dynamics during cell migration.
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Affiliation(s)
- Benjamin J Perrin
- Cellular and Molecular Biology Program, University of Wisconsin-Madison, Madison, WI 53706, USA
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