51
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Zhu S, Abounit S, Korth C, Zurzolo C. Transfer of disrupted-in-schizophrenia 1 aggregates between neuronal-like cells occurs in tunnelling nanotubes and is promoted by dopamine. Open Biol 2018; 7:rsob.160328. [PMID: 28275106 PMCID: PMC5376705 DOI: 10.1098/rsob.160328] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Accepted: 02/10/2017] [Indexed: 12/22/2022] Open
Abstract
The disrupted-in-schizophrenia 1 (DISC1) gene was identified as a genetic risk factor for chronic mental illnesses (CMI) such as schizophrenia, bipolar disorder and severe recurrent depression. Insoluble aggregated DISC1 variants were found in the cingular cortex of sporadic, i.e. non-genetic, CMI patients. This suggests protein pathology as a novel, additional pathogenic mechanism, further corroborated in a recent transgenic rat model presenting DISC1 aggregates. Since the potential role of aggregation of DISC1 in sporadic CMI is unknown, we investigated whether DISC1 undergoes aggregation in cell culture and could spread between neuronal cells in a prion-like manner, as shown for amyloid proteins in neurodegenerative diseases. Co-culture experiments between donor cells forming DISC1 aggregates and acceptor cells showed that 4.5% of acceptor cells contained donor-derived DISC1 aggregates, thus indicating an efficient transfer in vitro. DISC1 aggregates were found inside tunnelling nanotubes (TNTs) and transfer was enhanced by increasing TNT formation and notably by dopamine treatment, which also induces DISC1 aggregation. These data indicate that DISC1 aggregates can propagate between cells similarly to prions, thus providing some molecular basis for the role of protein pathology in CMI.
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Affiliation(s)
- Seng Zhu
- Institut Pasteur, Membrane Traffic and Pathogenesis Unit, 25-28 rue du Docteur Roux, 75724 Paris, France
| | - Saïda Abounit
- Institut Pasteur, Membrane Traffic and Pathogenesis Unit, 25-28 rue du Docteur Roux, 75724 Paris, France
| | - Carsten Korth
- Department of Neuropathology, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Chiara Zurzolo
- Institut Pasteur, Membrane Traffic and Pathogenesis Unit, 25-28 rue du Docteur Roux, 75724 Paris, France
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52
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Kim S, Lee YK, Hong JH, Park J, Choi Y, Lee DU, Choi J, Sym SJ, Kim S, Khang D. Mutual Destruction of Deep Lung Tumor Tissues by Nanodrug-Conjugated Stealth Mesenchymal Stem Cells. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2018; 5:1700860. [PMID: 29876212 PMCID: PMC5979625 DOI: 10.1002/advs.201700860] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2017] [Revised: 01/29/2018] [Indexed: 05/11/2023]
Abstract
Lung cancer is a highly malignant tumor, and targeted delivery of anti-cancer drugs to deep lung tumor tissue remains a challenge in drug design. Here, it is demonstrated that bone marrow mesenchymal stem cells armed with nanodrugs are highly targeted and mutually destructive with malignant lung cancer cells and successfully eradicate lung tumors tissues. Using this approach, the current clinical dose of anti-cancer drugs for the treatment of malignant lung tumors can be decreased by more than 100-fold without triggering immunotoxicity.
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Affiliation(s)
- Sang‐Woo Kim
- Lee Gil Ya Cancer and Diabetes InstituteGachon UniversityIncheon21999South Korea
| | - Yeon Kyung Lee
- Lee Gil Ya Cancer and Diabetes InstituteGachon UniversityIncheon21999South Korea
| | - Jeong Hee Hong
- Lee Gil Ya Cancer and Diabetes InstituteGachon UniversityIncheon21999South Korea
- Department of PhysiologySchool of MedicineGachon UniversityIncheon21999South Korea
| | - Jun‐Young Park
- Lee Gil Ya Cancer and Diabetes InstituteGachon UniversityIncheon21999South Korea
| | - Young‐Ae Choi
- Department of PharmacologySchool of MedicineKyungpook National UniversityDaegu41566South Korea
| | - Dong Un Lee
- Lee Gil Ya Cancer and Diabetes InstituteGachon UniversityIncheon21999South Korea
| | - Jungil Choi
- Gyeongnam Department of Environmental Toxicology and ChemistryKorea Institute of ToxicologyJinju52834South Korea
| | - Sun Jin Sym
- Division of Hematology and OncologySchool of MedicineGachon University and Gil HospitalIncheon21565South Korea
| | - Sang‐Hyun Kim
- Department of PharmacologySchool of MedicineKyungpook National UniversityDaegu41566South Korea
| | - Dongwoo Khang
- Lee Gil Ya Cancer and Diabetes InstituteGachon UniversityIncheon21999South Korea
- Department of PhysiologySchool of MedicineGachon UniversityIncheon21999South Korea
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53
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Baidya AK, Bhattacharya S, Dubey GP, Mamou G, Ben-Yehuda S. Bacterial nanotubes: a conduit for intercellular molecular trade. Curr Opin Microbiol 2018; 42:1-6. [DOI: 10.1016/j.mib.2017.08.006] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 08/23/2017] [Accepted: 08/28/2017] [Indexed: 12/01/2022]
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54
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Abstract
While HIV-1 infection of target cells with cell-free viral particles has been largely documented, intercellular transmission through direct cell-to-cell contact may be a predominant mode of propagation in host. To spread, HIV-1 infects cells of the immune system and takes advantage of their specific particularities and functions. Subversion of intercellular communication allows to improve HIV-1 replication through a multiplicity of intercellular structures and membrane protrusions, like tunneling nanotubes, filopodia, or lamellipodia-like structures involved in the formation of the virological synapse. Other features of immune cells, like the immunological synapse or the phagocytosis of infected cells are hijacked by HIV-1 and used as gateways to infect target cells. Finally, HIV-1 reuses its fusogenic capacity to provoke fusion between infected donor cells and target cells, and to form infected syncytia with high capacity of viral production and improved capacities of motility or survival. All these modes of cell-to-cell transfer are now considered as viral mechanisms to escape immune system and antiretroviral therapies, and could be involved in the establishment of persistent virus reservoirs in different host tissues.
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Affiliation(s)
- Lucie Bracq
- Inserm U1016, Institut Cochin, Paris, France.,CNRS, UMR8104, Paris, France.,Université Paris-Descartes, Sorbonne Paris-Cité, Paris, France.,International Associated Laboratory (LIA VirHost), Institut Pasteur Shanghai-Chinese Academy of Sciences, Shanghai, China.,International Associated Laboratory (LIA VirHost), CNRS, Université Paris-Descartes, Institut Pasteur, Paris, France
| | - Maorong Xie
- Inserm U1016, Institut Cochin, Paris, France.,CNRS, UMR8104, Paris, France.,Université Paris-Descartes, Sorbonne Paris-Cité, Paris, France.,International Associated Laboratory (LIA VirHost), CNRS, Université Paris-Descartes, Institut Pasteur, Paris, France
| | - Serge Benichou
- Inserm U1016, Institut Cochin, Paris, France.,CNRS, UMR8104, Paris, France.,Université Paris-Descartes, Sorbonne Paris-Cité, Paris, France.,International Associated Laboratory (LIA VirHost), Institut Pasteur Shanghai-Chinese Academy of Sciences, Shanghai, China.,International Associated Laboratory (LIA VirHost), CNRS, Université Paris-Descartes, Institut Pasteur, Paris, France
| | - Jérôme Bouchet
- Inserm U1016, Institut Cochin, Paris, France.,CNRS, UMR8104, Paris, France.,Université Paris-Descartes, Sorbonne Paris-Cité, Paris, France.,International Associated Laboratory (LIA VirHost), CNRS, Université Paris-Descartes, Institut Pasteur, Paris, France
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55
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Liang D. A Salutary Role of Reactive Oxygen Species in Intercellular Tunnel-Mediated Communication. Front Cell Dev Biol 2018; 6:2. [PMID: 29503816 PMCID: PMC5821100 DOI: 10.3389/fcell.2018.00002] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 01/18/2018] [Indexed: 12/17/2022] Open
Abstract
The reactive oxygen species, generally labeled toxic due to high reactivity without target specificity, are gradually uncovered as signaling molecules involved in a myriad of biological processes. But one important feature of ROS roles in macromolecule movement has not caught attention until recent studies with technique advance and design elegance have shed lights on ROS signaling for intercellular and interorganelle communication. This review begins with the discussions of genetic and chemical studies on the regulation of symplastic dye movement through intercellular tunnels in plants (plasmodesmata), and focuses on the ROS regulatory mechanisms concerning macromolecule movement including small RNA-mediated gene silencing movement and protein shuttling between cells. Given the premise that intercellular tunnels (bridges) in mammalian cells are the key physical structures to sustain intercellular communication, movement of macromolecules and signals is efficiently facilitated by ROS-induced membrane protrusions formation, which is analogously applied to the interorganelle communication in plant cells. Although ROS regulatory differences between plant and mammalian cells exist, the basis for ROS-triggered conduit formation underlies a unifying conservative theme in multicellular organisms. These mechanisms may represent the evolutionary advances that have enabled multicellularity to gain the ability to generate and utilize ROS to govern material exchanges between individual cells in oxygenated environment.
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Affiliation(s)
- Dacheng Liang
- Hubei Collaborative Innovation Center for Grain Industry, School of Agriculture, Yangtze University, Jingzhou, China.,Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, Yangtze University, Jingzhou, China
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56
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Peng BY, Dubey NK, Mishra VK, Tsai FC, Dubey R, Deng WP, Wei HJ. Addressing Stem Cell Therapeutic Approaches in Pathobiology of Diabetes and Its Complications. J Diabetes Res 2018; 2018:7806435. [PMID: 30046616 PMCID: PMC6036791 DOI: 10.1155/2018/7806435] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2018] [Revised: 04/19/2018] [Accepted: 05/27/2018] [Indexed: 12/14/2022] Open
Abstract
High morbidity and mortality of diabetes mellitus (DM) throughout the human population is a serious threat which needs to be addressed cautiously. Type 1 diabetes mellitus (T1DM) and type 2 diabetes mellitus (T2DM) are most prevalent forms. Disruption in insulin regulation and resistance leads to increased formation and accumulation of advanced end products (AGEs), which further enhance oxidative and nitrosative stress leading to microvascular (retinopathy, neuropathy, and nephropathy) and macrovascular complications. These complications affect the normal function of organ and tissues and may cause life-threatening disorders, if hyperglycemia persists and improperly controlled. Current and traditional treatment procedures are only focused on to regulate the insulin level and do not cure the diabetic complications. Pancreatic transplantation seemed a viable alternative; however, it is limited due to lack of donors. Cell-based therapy such as stem cells is considered as a promising therapeutic agent against DM and diabetic complications owing to their multilineage differentiation and regeneration potential. Previous studies have demonstrated the various impacts of both pluripotent and multipotent stem cells on DM and its micro- and macrovascular complications. Therefore, this review summarizes the potential of stem cells to treat DM and its related complications.
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Affiliation(s)
- Bou-Yue Peng
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei City 110, Taiwan
- Department of Dentistry, Taipei Medical University Hospital, Taipei City 110, Taiwan
| | - Navneet Kumar Dubey
- Ceramics and Biomaterials Research Group, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam
- Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam
| | - Viraj Krishna Mishra
- Applied Biotech Engineering Centre (ABEC), Department of Biotechnology, Ambala College of Engineering and Applied Research, Ambala, India
| | - Feng-Chou Tsai
- Department of Stem Cell Research, Cosmetic Clinic Group, Taipei City 110, Taiwan
| | - Rajni Dubey
- Graduate Institute of Food Science and Technology, National Taiwan University, Taipei City 106, Taiwan
| | - Win-Ping Deng
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei City 110, Taiwan
- Stem Cell Research Center, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
- Graduate Institute of Basic Medicine, Fu Jen Catholic University, New Taipei City 242, Taiwan
| | - Hong-Jian Wei
- Stem Cell Research Center, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
- School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei City 110, Taiwan
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57
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Masnata M, Cicchetti F. The Evidence for the Spread and Seeding Capacities of the Mutant Huntingtin Protein in in Vitro Systems and Their Therapeutic Implications. Front Neurosci 2017; 11:647. [PMID: 29234268 PMCID: PMC5712341 DOI: 10.3389/fnins.2017.00647] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Accepted: 11/07/2017] [Indexed: 12/22/2022] Open
Abstract
Neurodegenerative disorders are not only characterized by specific patterns of cell loss but the presence and accumulation of various pathological proteins—both of which correlate with disease evolution. There is now mounting evidence to suggest that these pathological proteins present with toxic, at times prion-like, properties and can therefore seed pathology in neighboring as well remotely connected healthy neurons as they spread across the brain. What is less clear, at this stage, is how much this actually contributes to, and drives, the core pathogenic events. In this review, we present a comprehensive, up-to-date summary of the reported in vitro studies that support the spreading and seeding capacities of pathological proteins, with an emphasis on mutant huntingtin protein in the context of Huntington's disease, although in vivo work remains to be performed to validate this theory in this particular disease. We have further reviewed these findings in light of their potential implications for the development of novel therapeutic approaches.
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Affiliation(s)
- Maria Masnata
- Axe Neurosciences, Centre de Recherche du CHU de Québec-Université Laval, Quebec, QC, Canada
| | - Francesca Cicchetti
- Axe Neurosciences, Centre de Recherche du CHU de Québec-Université Laval, Quebec, QC, Canada.,Département de Psychiatrie & Neurosciences, Université Laval, Quebec, QC, Canada
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58
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Nussenzveig HM. Cell membrane biophysics with optical tweezers. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2017; 47:499-514. [PMID: 29164289 DOI: 10.1007/s00249-017-1268-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 09/29/2017] [Accepted: 11/13/2017] [Indexed: 10/24/2022]
Abstract
Membrane elastic properties play important roles in regulating cell shape, motility, division and differentiation. Here I review optical tweezer (OT) investigations of membrane surface tension and bending modulus, emphasizing didactic aspects and insights provided for cell biology. OT measurements employ membrane-attached microspheres to extract long cylindrical nanotubes named tethers. The Helfrich-Canham theory yields elastic parameters in terms of tether radius and equilibrium extraction force. It assumes initial point-like microsphere attachment and no cytoskeleton content within tethers. Experimental force-displacement curves reveal violations of those assumptions, and I discuss proposed explanations of such discrepancies, as well as recommended OT protocols. Measurements of elastic parameters for predominant cell types in the central nervous system yield correlations between their values and cell function. Micro-rheology OT experiments extend these correlations to viscoelastic parameters. The results agree with a quasi-universal phenomenological scaling law and are interpreted in terms of the soft glass rheology model. Spontaneously-generated cell nanotube protrusions are also briefly reviewed, emphasizing common features with tethers. Filopodia as well as tunneling nanotubes (TNT), which connect distant cells and allow transfers between their cytoplasms, are discussed, including OT tether pulling from TNTs which mediate communication among bacteria, even of different species. Pathogens, including bacteria, viruses and prions, opportunistically exploit TNTs for cell-to-cell transmission of infection, indicating that TNTs have an ancient evolutionary origin.
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Affiliation(s)
- H Moysés Nussenzveig
- LPO-COPEA, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, 21941-902, Brazil. .,Instituto de Física, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, 21941-972, Brazil.
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59
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Pseudorabies Virus US3-Induced Tunneling Nanotubes Contain Stabilized Microtubules, Interact with Neighboring Cells via Cadherins, and Allow Intercellular Molecular Communication. J Virol 2017; 91:JVI.00749-17. [PMID: 28747498 DOI: 10.1128/jvi.00749-17] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Accepted: 07/16/2017] [Indexed: 01/01/2023] Open
Abstract
Tunneling nanotubes (TNTs) are long bridge-like structures that connect eukaryotic cells and mediate intercellular communication. We found earlier that the conserved alphaherpesvirus US3 protein kinase induces long cell projections that contact distant cells and promote intercellular virus spread. In this report, we show that the US3-induced cell projections constitute TNTs. In addition, we report that US3-induced TNTs mediate intercellular transport of information (e.g., green fluorescent protein [GFP]) in the absence of other viral proteins. US3-induced TNTs are remarkably stable compared to most TNTs described in the literature. In line with this, US3-induced TNTs were found to contain stabilized (acetylated and detyrosinated) microtubules. Transmission electron microscopy showed that virus particles are individually transported in membrane-bound vesicles in US3-induced TNTs and are released along the TNT and at the contact area between a TNT and the adjacent cell. Contact between US3-induced TNTs and acceptor cells is very stable, which correlated with a marked enrichment in adherens junction components beta-catenin and E-cadherin at the contact area. These data provide new structural insights into US3-induced TNTs and how they may contribute to intercellular communication and alphaherpesvirus spread.IMPORTANCE Tunneling nanotubes (TNT) represent an important and yet still poorly understood mode of long-distance intercellular communication. We and others reported earlier that the conserved alphaherpesvirus US3 protein kinase induces long cellular protrusions in infected and transfected cells. Here, we show that US3-induced cell projections constitute TNTs, based on structural properties and transport of biomolecules. In addition, we report on different particular characteristics of US3-induced TNTs that help to explain their remarkable stability compared to physiological TNTs. In addition, transmission electron microscopy assays indicate that, in infected cells, virions travel in the US3-induced TNTs in membranous transport vesicles and leave the TNT via exocytosis. These data generate new fundamental insights into the biology of (US3-induced) TNTs and into how they may contribute to intercellular virus spread and communication.
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60
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Hanna SJ, McCoy-Simandle K, Miskolci V, Guo P, Cammer M, Hodgson L, Cox D. The Role of Rho-GTPases and actin polymerization during Macrophage Tunneling Nanotube Biogenesis. Sci Rep 2017; 7:8547. [PMID: 28819224 PMCID: PMC5561213 DOI: 10.1038/s41598-017-08950-7] [Citation(s) in RCA: 91] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Accepted: 07/17/2017] [Indexed: 01/06/2023] Open
Abstract
Macrophage interactions with other cells, either locally or at distances, are imperative in both normal and pathological conditions. While soluble means of communication can transmit signals between different cells, it does not account for all long distance macrophage interactions. Recently described tunneling nanotubes (TNTs) are membranous channels that connect cells together and allow for transfer of signals, vesicles, and organelles. However, very little is known about the mechanism by which these structures are formed. Here we investigated the signaling pathways involved in TNT formation by macrophages using multiple imaging techniques including super-resolution microscopy (3D-SIM) and live-cell imaging including the use of FRET-based Rho GTPase biosensors. We found that formation of TNTs required the activity and differential localization of Cdc42 and Rac1. The downstream Rho GTPase effectors mediating actin polymerization through Arp2/3 nucleation, Wiskott-Aldrich syndrome protein (WASP) and WASP family verprolin-homologous 2 (WAVE2) proteins are also important, and both pathways act together during TNT biogenesis. Finally, TNT function as measured by transfer of cellular material between cells was reduced following depletion of a single factor demonstrating the importance of these factors in TNTs. Given that the characterization of TNT formation is still unclear in the field; this study provides new insights and would enhance the understanding of TNT formation towards investigating new markers.
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Affiliation(s)
- Samer J Hanna
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1300 Morris Park Ave, Gruss MRRC 306, Bronx, NY, 10461, USA
| | - Kessler McCoy-Simandle
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1300 Morris Park Ave, Gruss MRRC 306, Bronx, NY, 10461, USA
| | - Veronika Miskolci
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1300 Morris Park Ave, Gruss MRRC 306, Bronx, NY, 10461, USA
| | - Peng Guo
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1300 Morris Park Ave, Gruss MRRC 306, Bronx, NY, 10461, USA.,Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, Bronx, NY, USA.,Analytical Imaging Facility, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Michael Cammer
- Microscopy Core, DART, NYU Langone Medical Center, Bronx, NY, 10016, USA
| | - Louis Hodgson
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1300 Morris Park Ave, Gruss MRRC 306, Bronx, NY, 10461, USA.,Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Dianne Cox
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1300 Morris Park Ave, Gruss MRRC 306, Bronx, NY, 10461, USA. .,Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, 1300 Morris Park Ave, Gruss MRRC 306, Bronx, NY, 10461, USA. .,Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, Bronx, NY, USA.
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61
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Kumar A, Kim JH, Ranjan P, Metcalfe MG, Cao W, Mishina M, Gangappa S, Guo Z, Boyden ES, Zaki S, York I, García-Sastre A, Shaw M, Sambhara S. Influenza virus exploits tunneling nanotubes for cell-to-cell spread. Sci Rep 2017; 7:40360. [PMID: 28059146 PMCID: PMC5216422 DOI: 10.1038/srep40360] [Citation(s) in RCA: 97] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 12/06/2016] [Indexed: 02/06/2023] Open
Abstract
Tunneling nanotubes (TNTs) represent a novel route of intercellular communication. While previous work has shown that TNTs facilitate the exchange of viral or prion proteins from infected to naïve cells, it is not clear whether the viral genome is also transferred via this mechanism and further, whether transfer via this route can result in productive replication of the infectious agents in the recipient cell. Here we present evidence that lung epithelial cells are connected by TNTs, and in spite of the presence of neutralizing antibodies and an antiviral agent, Oseltamivir, influenza virus can exploit these networks to transfer viral proteins and genome from the infected to naïve cell, resulting in productive viral replication in the naïve cells. These observations indicate that influenza viruses can spread using these intercellular networks that connect epithelial cells, evading immune and antiviral defenses and provide an explanation for the incidence of influenza infections even in influenza-immune individuals and vaccine failures.
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Affiliation(s)
- Amrita Kumar
- Immunology and Pathogenesis Branch, Influenza Division, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30329-4027, USA
| | - Jin Hyang Kim
- Immunology and Pathogenesis Branch, Influenza Division, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30329-4027, USA
| | - Priya Ranjan
- Immunology and Pathogenesis Branch, Influenza Division, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30329-4027, USA
| | - Maureen G Metcalfe
- Infectious Diseases Pathology Branch, Division of High-Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30329-4027, USA
| | - Weiping Cao
- Immunology and Pathogenesis Branch, Influenza Division, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30329-4027, USA
| | - Margarita Mishina
- Immunology and Pathogenesis Branch, Influenza Division, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30329-4027, USA
| | - Shivaprakash Gangappa
- Immunology and Pathogenesis Branch, Influenza Division, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30329-4027, USA
| | - Zhu Guo
- Virus Surveillance and Diagnostics Branch, Influenza Division, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30329-4027, USA
| | - Edward S Boyden
- Media Lab, McGovern Institute, Department of Brain and Cognitive Sciences, MIT, Cambridge, MA, USA
| | - Sherif Zaki
- Infectious Diseases Pathology Branch, Division of High-Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30329-4027, USA
| | - Ian York
- Immunology and Pathogenesis Branch, Influenza Division, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30329-4027, USA
| | - Adolfo García-Sastre
- Department of Microbiology, Department of Infectious Disease, Global Health and Emerging Pathogens Institute and Department of Medicine, Division of Infectious Diseases, Icahn School of Medicine at Mount Sinai, New York, USA
| | - Michael Shaw
- Office of Infectious Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30329-4027, USA
| | - Suryaprakash Sambhara
- Immunology and Pathogenesis Branch, Influenza Division, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30329-4027, USA
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Delage E, Cervantes DC, Pénard E, Schmitt C, Syan S, Disanza A, Scita G, Zurzolo C. Differential identity of Filopodia and Tunneling Nanotubes revealed by the opposite functions of actin regulatory complexes. Sci Rep 2016; 6:39632. [PMID: 28008977 PMCID: PMC5180355 DOI: 10.1038/srep39632] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Accepted: 11/25/2016] [Indexed: 11/09/2022] Open
Abstract
Tunneling Nanotubes (TNTs) are actin enriched filopodia-like protrusions that play a pivotal role in long-range intercellular communication. Different pathogens use TNT-like structures as "freeways" to propagate across cells. TNTs are also implicated in cancer and neurodegenerative diseases, making them promising therapeutic targets. Understanding the mechanism of their formation, and their relation with filopodia is of fundamental importance to uncover their physiological function, particularly since filopodia, differently from TNTs, are not able to mediate transfer of cargo between distant cells. Here we studied different regulatory complexes of actin, which play a role in the formation of both these structures. We demonstrate that the filopodia-promoting CDC42/IRSp53/VASP network negatively regulates TNT formation and impairs TNT-mediated intercellular vesicle transfer. Conversely, elevation of Eps8, an actin regulatory protein that inhibits the extension of filopodia in neurons, increases TNT formation. Notably, Eps8-mediated TNT induction requires Eps8 bundling but not its capping activity. Thus, despite their structural similarities, filopodia and TNTs form through distinct molecular mechanisms. Our results further suggest that a switch in the molecular composition in common actin regulatory complexes is critical in driving the formation of either type of membrane protrusion.
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Affiliation(s)
- Elise Delage
- Unité Trafic Membranaire et Pathogenèse, Institut Pasteur, 25-28 Rue du Docteur Roux, 75724 Paris CEDEX 15, France
| | - Diégo Cordero Cervantes
- Unité Trafic Membranaire et Pathogenèse, Institut Pasteur, 25-28 Rue du Docteur Roux, 75724 Paris CEDEX 15, France
| | - Esthel Pénard
- Unité Trafic Membranaire et Pathogenèse, Institut Pasteur, 25-28 Rue du Docteur Roux, 75724 Paris CEDEX 15, France
| | - Christine Schmitt
- Ultrapole, Institut Pasteur, 25-28 Rue du Docteur Roux, 75724 Paris CEDEX 15, France
| | - Sylvie Syan
- Unité Trafic Membranaire et Pathogenèse, Institut Pasteur, 25-28 Rue du Docteur Roux, 75724 Paris CEDEX 15, France
| | - Andrea Disanza
- FIRC Institute of Molecular Oncology, 20139 Milan, Italy
| | - Giorgio Scita
- FIRC Institute of Molecular Oncology, 20139 Milan, Italy.,Dipartimento di Scienze della Salute, Università degli Studi di Milano, 20122 Milan, Italy
| | - Chiara Zurzolo
- Unité Trafic Membranaire et Pathogenèse, Institut Pasteur, 25-28 Rue du Docteur Roux, 75724 Paris CEDEX 15, France
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Cherqui S, Courtoy PJ. The renal Fanconi syndrome in cystinosis: pathogenic insights and therapeutic perspectives. Nat Rev Nephrol 2016; 13:115-131. [PMID: 27990015 DOI: 10.1038/nrneph.2016.182] [Citation(s) in RCA: 106] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Cystinosis is an autosomal recessive metabolic disease that belongs to the family of lysosomal storage disorders. It is caused by a defect in the lysosomal cystine transporter, cystinosin, which results in an accumulation of cystine in all organs. Despite the ubiquitous expression of cystinosin, a renal Fanconi syndrome is often the first manifestation of cystinosis, usually presenting within the first year of life and characterized by the early and severe dysfunction of proximal tubule cells, highlighting the unique vulnerability of this cell type. The current therapy for cystinosis, cysteamine, facilitates lysosomal cystine clearance and greatly delays progression to kidney failure but is unable to correct the Fanconi syndrome. This Review summarizes decades of studies that have fostered a better understanding of the pathogenesis of the renal Fanconi syndrome associated with cystinosis. These studies have unraveled some of the early molecular changes that occur before the onset of tubular atrophy and identified a role for cystinosin beyond cystine transport, in endolysosomal trafficking and proteolysis, lysosomal clearance, autophagy and the regulation of energy balance. These studies have also led to the identification of new potential therapeutic targets and here, we outline the potential role of stem cell therapy for cystinosis and provide insights into the mechanism of haematopoietic stem cell-mediated kidney protection.
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Affiliation(s)
- Stephanie Cherqui
- Department of Pediatrics, Division of Genetics, University of California San Diego, 9500 Gilman Drive, MC 0734, La Jolla, California 92093-0734, USA
| | - Pierre J Courtoy
- Cell biology, de Duve Institute and Université catholique de Louvain, UCL-Brussels, 75 Avenue Hippocrate, B-1200 Brussels, Belgium
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Martinez MG, Kielian M. Intercellular Extensions Are Induced by the Alphavirus Structural Proteins and Mediate Virus Transmission. PLoS Pathog 2016; 12:e1006061. [PMID: 27977778 PMCID: PMC5158078 DOI: 10.1371/journal.ppat.1006061] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Accepted: 11/13/2016] [Indexed: 11/19/2022] Open
Abstract
Alphaviruses are highly organized enveloped RNA viruses with an internal nucleocapsid surrounded by a membrane containing the E2 and E1 transmembrane proteins. Alphavirus budding takes place at the plasma membrane and requires the interaction of the cytoplasmic domain of E2 with the capsid protein. Here we used WT alphaviruses and Sindbis virus in which E2 was fused to a fluorescent protein to characterize virus exit from host cells. Our results show that alphavirus infection induced striking modifications of the host cell cytoskeleton and resulted in the formation of stable intercellular extensions that emanated exclusively from the infected cell. The intercellular extensions were long (> 10 μM), contained actin and tubulin, and formed flattened contacts with neighboring cells, but did not mediate membrane or cytoplasmic continuity between cells. Receptor down-regulation studies indicated that formation of stable extensions did not require the virus receptor, and that extensions promoted cell-to-cell virus transmission to receptor-depleted cells. Virus mutant experiments demonstrated that formation of extensions required the E2-capsid interaction but not active particle budding, while intercellular transmission of infection required the production of fusion-active virus particles. Protein expression studies showed that even in the absence of virus infection, the viral structural proteins alone induced intercellular extensions, and that these extensions were preferentially targeted to non-expressing cells. Together, our results identify a mechanism for alphavirus cell-to-cell transmission and define the key viral protein interactions that it requires. Alphaviruses are a group of small enveloped RNA viruses that include a number of important human pathogens such as Chikungunya virus and viruses that cause fatal encephalitis. Chikungunya virus emerged recently in a number of countries worldwide including the Americas, where it has caused major outbreaks. Vaccines and anti-viral strategies for these viruses are urgently needed, and basic information on the alphavirus infection pathway will help in targeting critical steps. Here we describe the changes in the alphavirus-infected cell that allow it to transmit virus to neighboring uninfected cells. Infected cells form long extensions that contact neighboring cells and mediate cell-to-cell virus transmission. This mechanism of virus transmission may help to shield virus from neutralization by host antibodies. Surprisingly, expression of the viral structural proteins alone induces these intercellular extensions, which preferentially target non-expressing cells. We used this system to define a critical interaction of the capsid and envelope protein that is required for formation of extensions.
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Affiliation(s)
- Maria Guadalupe Martinez
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York, United States of America
| | - Margaret Kielian
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York, United States of America
- * E-mail:
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65
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Osteikoetxea-Molnár A, Szabó-Meleg E, Tóth EA, Oszvald Á, Izsépi E, Kremlitzka M, Biri B, Nyitray L, Bozó T, Németh P, Kellermayer M, Nyitrai M, Matko J. The growth determinants and transport properties of tunneling nanotube networks between B lymphocytes. Cell Mol Life Sci 2016; 73:4531-4545. [PMID: 27125884 PMCID: PMC11108537 DOI: 10.1007/s00018-016-2233-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Revised: 04/13/2016] [Accepted: 04/19/2016] [Indexed: 12/13/2022]
Abstract
Tunneling nanotubes (TNTs) are long intercellular connecting structures providing a special transport route between two neighboring cells. To date TNTs have been reported in different cell types including immune cells such as T-, NK, dendritic cells, or macrophages. Here we report that mature, but not immature, B cells spontaneously form extensive TNT networks under conditions resembling the physiological environment. Live-cell fluorescence, structured illumination, and atomic force microscopic imaging provide new insights into the structure and dynamics of B cell TNTs. Importantly, the selective interaction of cell surface integrins with fibronectin or laminin extracellular matrix proteins proved to be essential for initiating TNT growth in B cells. These TNTs display diversity in length and thickness and contain not only F-actin, but their majority also contain microtubules, which were found, however, not essential for TNT formation. Furthermore, we demonstrate that Ca2+-dependent cortical actin dynamics exert a fundamental control over TNT growth-retraction equilibrium, suggesting that actin filaments form the TNT skeleton. Non-muscle myosin 2 motor activity was shown to provide a negative control limiting the uncontrolled outgrowth of membranous protrusions. Moreover, we also show that spontaneous growth of TNTs is either reduced or increased by B cell receptor- or LPS-mediated activation signals, respectively, thus supporting the critical role of cytoplasmic Ca2+ in regulation of TNT formation. Finally, we observed transport of various GM1/GM3+ vesicles, lysosomes, and mitochondria inside TNTs, as well as intercellular exchange of MHC-II and B7-2 (CD86) molecules which may represent novel pathways of intercellular communication and immunoregulation.
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Affiliation(s)
| | - Edina Szabó-Meleg
- Department of Biophysics, Medical Faculty, University of Pécs, Pecs, Hungary
- MTA-PTE Nuclear-Mitochondrial Interactions Research Group, Pecs, Hungary
| | | | - Ádám Oszvald
- Department of Immunology, Eötvös Loránd University, Budapest, Hungary
| | - Emese Izsépi
- Department of Immunology, Eötvös Loránd University, Budapest, Hungary
| | | | - Beáta Biri
- Department of Biochemistry, Eötvös Loránd University, Budapest, Hungary
| | - László Nyitray
- Department of Biochemistry, Eötvös Loránd University, Budapest, Hungary
| | - Tamás Bozó
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary
| | - Péter Németh
- Environmental Chemistry Research Group, Research Centre for Natural Sciences, Budapest, Hungary
| | - Miklós Kellermayer
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary
- MTA-SE Molecular Biophysics Research Group, Budapest, Hungary
| | - Miklós Nyitrai
- Department of Biophysics, Medical Faculty, University of Pécs, Pecs, Hungary
- MTA-PTE Nuclear-Mitochondrial Interactions Research Group, Pecs, Hungary
| | - Janos Matko
- Department of Immunology, Eötvös Loránd University, Budapest, Hungary.
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66
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Tardivel M, Bégard S, Bousset L, Dujardin S, Coens A, Melki R, Buée L, Colin M. Tunneling nanotube (TNT)-mediated neuron-to neuron transfer of pathological Tau protein assemblies. Acta Neuropathol Commun 2016; 4:117. [PMID: 27809932 PMCID: PMC5096005 DOI: 10.1186/s40478-016-0386-4] [Citation(s) in RCA: 191] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 10/20/2016] [Indexed: 11/24/2022] Open
Abstract
A given cell makes exchanges with its neighbors through a variety of means ranging from diffusible factors to vesicles. Cells use also tunneling nanotubes (TNTs), filamentous-actin-containing membranous structures that bridge and connect cells. First described in immune cells, TNTs facilitate HIV-1 transfer and are found in various cell types, including neurons. We show that the microtubule-associated protein Tau, a key player in Alzheimer’s disease, is a bona fide constituent of TNTs. This is important because Tau appears beside filamentous actin and myosin 10 as a specific marker of these fine protrusions of membranes and cytosol that are difficult to visualize. Furthermore, we observed that exogenous Tau species increase the number of TNTs established between primary neurons, thereby facilitating the intercellular transfer of Tau fibrils. In conclusion, Tau may contribute to the formation and function of the highly dynamic TNTs that may be involved in the prion-like propagation of Tau assemblies.
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67
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Abounit S, Bousset L, Loria F, Zhu S, de Chaumont F, Pieri L, Olivo-Marin JC, Melki R, Zurzolo C. Tunneling nanotubes spread fibrillar α-synuclein by intercellular trafficking of lysosomes. EMBO J 2016; 35:2120-2138. [PMID: 27550960 DOI: 10.15252/embj.201593411] [Citation(s) in RCA: 258] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 07/22/2016] [Indexed: 12/25/2022] Open
Abstract
Synucleinopathies such as Parkinson's disease are characterized by the pathological deposition of misfolded α-synuclein aggregates into inclusions throughout the central and peripheral nervous system. Mounting evidence suggests that intercellular propagation of α-synuclein aggregates may contribute to the neuropathology; however, the mechanism by which spread occurs is not fully understood. By using quantitative fluorescence microscopy with co-cultured neurons, here we show that α-synuclein fibrils efficiently transfer from donor to acceptor cells through tunneling nanotubes (TNTs) inside lysosomal vesicles. Following transfer through TNTs, α-synuclein fibrils are able to seed soluble α-synuclein aggregation in the cytosol of acceptor cells. We propose that donor cells overloaded with α-synuclein aggregates in lysosomes dispose of this material by hijacking TNT-mediated intercellular trafficking. Our findings thus reveal a possible novel role of TNTs and lysosomes in the progression of synucleinopathies.
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Affiliation(s)
- Saïda Abounit
- Institut Pasteur, Unité Trafic Membranaire et Pathogénèse, Paris Cedex 15, France
| | - Luc Bousset
- Paris-Saclay Institute of Neuroscience, CNRS, Gif-sur-Yvette, France
| | - Frida Loria
- Institut Pasteur, Unité Trafic Membranaire et Pathogénèse, Paris Cedex 15, France
| | - Seng Zhu
- Institut Pasteur, Unité Trafic Membranaire et Pathogénèse, Paris Cedex 15, France
| | - Fabrice de Chaumont
- Laboratoire d'Analyse d'Images Quantitative, Institut Pasteur, Paris Cedex 15, France
| | - Laura Pieri
- Paris-Saclay Institute of Neuroscience, CNRS, Gif-sur-Yvette, France
| | | | - Ronald Melki
- Paris-Saclay Institute of Neuroscience, CNRS, Gif-sur-Yvette, France
| | - Chiara Zurzolo
- Institut Pasteur, Unité Trafic Membranaire et Pathogénèse, Paris Cedex 15, France
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68
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Tunneling nanotubes mediate the transfer of stem cell marker CD133 between hematopoietic progenitor cells. Exp Hematol 2016; 44:1092-1112.e2. [PMID: 27473566 DOI: 10.1016/j.exphem.2016.07.006] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Revised: 07/15/2016] [Accepted: 07/16/2016] [Indexed: 12/24/2022]
Abstract
Deciphering all mechanisms of intercellular communication used by hematopoietic progenitors is important, not only for basic stem cell research, but also in view of their therapeutic relevance. Here, we investigated whether these cells can produce the thin F-actin-based plasma membrane protrusions referred to as tunneling nanotubes (TNTs), which are known to bridge cells over long distances without contact with the substratum and transfer cargo molecules along them in various biological processes. We found that human primary CD34+ hematopoietic progenitors and leukemic KG1a cells develop such structures upon culture on primary mesenchymal stromal cells or specific extracellular-matrix-based substrata. Time-lapse video microscopy revealed that cell dislodgement is the primary mechanism responsible for TNT biogenesis. Surprisingly, we found that, among various cluster of differentiation (CD) markers, only the stem cell antigen CD133 is transferred between cells. It is selectively and directionally transported along the surface of TNTs in small clusters, such as cytoplasmic phospho-myosin light chain 2, suggesting that the latter actin motor protein might be implicated in this process. Our data provide new insights into the biology of hematopoietic progenitors that can contribute to our understanding of all facets of intercellular communication in the bone marrow microenvironment under healthy or cancerous conditions.
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69
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Scholkmann F. Long range physical cell-to-cell signalling via mitochondria inside membrane nanotubes: a hypothesis. Theor Biol Med Model 2016; 13:16. [PMID: 27267202 PMCID: PMC4896004 DOI: 10.1186/s12976-016-0042-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Accepted: 05/27/2016] [Indexed: 02/07/2023] Open
Abstract
Coordinated interaction of single cells by cell-to-cell communication (signalling) enables complex behaviour necessary for the functioning of multicellular organisms. A quite newly discovered cell-to-cell signalling mechanism relies on nanotubular cell-co-cell connections, termed "membrane nanotubes" (MNTs). The present paper presents the hypothesis that mitochondria inside MNTs can form a connected structure (mitochondrial network) which enables the exchange of energy and signals between cells. It is proposed that two modes of energy and signal transmission may occur: electrical/electrochemical and electromagnetic (optical). Experimental work supporting the hypothesis is reviewed, and suggestions for future research regarding the discussed topic are given.
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Affiliation(s)
- Felix Scholkmann
- Biomedical Optics Research Laboratory, Department of Neonatology, University Hospital Zurich, University of Zurich, Frauenklinikstr. 10, 8091, Zurich, Switzerland.
- Research Office for Complex Physical and Biological Systems (ROCoS), Mutschellenstr. 179, 8038, Zurich, Switzerland.
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70
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Drosophila cells use nanotube-like structures to transfer dsRNA and RNAi machinery between cells. Sci Rep 2016; 6:27085. [PMID: 27255932 PMCID: PMC4891776 DOI: 10.1038/srep27085] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Accepted: 05/12/2016] [Indexed: 01/22/2023] Open
Abstract
Tunnelling nanotubes and cytonemes function as highways for the transport of organelles, cytosolic and membrane-bound molecules, and pathogens between cells. During viral infection in the model organism Drosophila melanogaster, a systemic RNAi antiviral response is established presumably through the transport of a silencing signal from one cell to another via an unknown mechanism. Because of their role in cell-cell communication, we investigated whether nanotube-like structures could be a mediator of the silencing signal. Here, we describe for the first time in the context of a viral infection the presence of nanotube-like structures in different Drosophila cell types. These tubules, made of actin and tubulin, were associated with components of the RNAi machinery, including Argonaute 2, double-stranded RNA, and CG4572. Moreover, they were more abundant during viral, but not bacterial, infection. Super resolution structured illumination microscopy showed that Argonaute 2 and tubulin reside inside the tubules. We propose that nanotube-like structures are one of the mechanisms by which Argonaute 2, as part of the antiviral RNAi machinery, is transported between infected and non-infected cells to trigger systemic antiviral immunity in Drosophila.
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71
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Requena JR, Kristensson K, Korth C, Zurzolo C, Simmons M, Aguilar-Calvo P, Aguzzi A, Andreoletti O, Benestad SL, Böhm R, Brown K, Calgua B, del Río JA, Espinosa JC, Girones R, Godsave S, Hoelzle LE, Knittler MR, Kuhn F, Legname G, Laeven P, Mabbott N, Mitrova E, Müller-Schiffmann A, Nuvolone M, Peters PJ, Raeber A, Roth K, Schmitz M, Schroeder B, Sonati T, Stitz L, Taraboulos A, Torres JM, Yan ZX, Zerr I. The Priority position paper: Protecting Europe's food chain from prions. Prion 2016; 10:165-81. [PMID: 27220820 PMCID: PMC4981192 DOI: 10.1080/19336896.2016.1175801] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Revised: 03/28/2016] [Accepted: 04/01/2016] [Indexed: 01/09/2023] Open
Abstract
Bovine spongiform encephalopathy (BSE) created a global European crisis in the 1980s and 90s, with very serious health and economic implications. Classical BSE now appears to be under control, to a great extent as a result of a global research effort that identified the sources of prions in meat and bone meal (MBM) and developed new animal-testing tools that guided policy. Priority ( www.prionpriority.eu ) was a European Union (EU) Framework Program 7 (FP7)-funded project through which 21 European research institutions and small and medium enterprises (SMEs) joined efforts between 2009 and 2014, to conduct coordinated basic and applied research on prions and prion diseases. At the end of the project, the Priority consortium drafted a position paper ( www.prionpriority.eu/Priority position paper) with its main conclusions. In the present opinion paper, we summarize these conclusions. With respect to the issue of re-introducing ruminant protein into the feed-chain, our opinion is that sustaining an absolute ban on feeding ruminant protein to ruminants is essential. In particular, the spread and impact of non-classical forms of scrapie and BSE in ruminants is not fully understood and the risks cannot be estimated. Atypical prion agents will probably continue to represent the dominant form of prion diseases in the near future in Europe. Atypical L-type BSE has clear zoonotic potential, as demonstrated in experimental models. Similarly, there are now data indicating that the atypical scrapie agent can cross various species barriers. More epidemiological data from large cohorts are necessary to reach any conclusion on the impact of its transmissibility on public health. Re-evaluations of safety precautions may become necessary depending on the outcome of these studies. Intensified searching for molecular determinants of the species barrier is recommended, since this barrier is key for important policy areas and risk assessment. Understanding the structural basis for strains and the basis for adaptation of a strain to a new host will require continued fundamental research, also needed to understand mechanisms of prion transmission, replication and how they cause nervous system dysfunction and death. Early detection of prion infection, ideally at a preclinical stage, also remains crucial for development of effective treatment strategies.
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Affiliation(s)
- Jesús R. Requena
- CIMUS Biomedical Research Institute, University of Santiago de Compostela, Santiago de Compostela, Spain
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Sue Godsave
- Netherlands Cancer Institute, Amsterdam, The Netherlands
| | | | | | | | | | - Paul Laeven
- University of Maastricht, Maastricht, The Netherlands
| | | | - Eva Mitrova
- Medical University of Slovakia, Bratislava, Slovakia
| | | | | | - Peter J. Peters
- The Maastricht Multimodal Molecular Imaging Institute, University of Maastricht, Maastricht, The Netherlands
| | | | | | | | | | | | - Lothar Stitz
- Friedrich Löffler Institut, Insel Reims, Germany
| | | | | | | | - Inga Zerr
- Universitätmedizin Göttingen, Göttingen, Germany
- German Center for Neurodegenerative Diseases (DZNE), Göttingen, Germany
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72
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Zaccard CR, Rinaldo CR, Mailliard RB. Linked in: immunologic membrane nanotube networks. J Leukoc Biol 2016; 100:81-94. [PMID: 26931578 DOI: 10.1189/jlb.4vmr0915-395r] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Accepted: 02/01/2016] [Indexed: 01/01/2023] Open
Abstract
Membrane nanotubes, also termed tunneling nanotubes, are F-actin-based structures that can form direct cytoplasmic connections and support rapid communication between distant cells. These nanoscale conduits have been observed in diverse cell types, including immune, neuronal, stromal, cancer, and stem cells. Until recently, little was known about the mechanisms involved in membrane nanotube development in myeloid origin APCs or how membrane nanotube networks support their ability to bridge innate and adaptive immunity. New research has provided insight into the modes of induction and regulation of the immune process of "reticulation" or the development of multicellular membrane nanotube networks in dendritic cells. Preprogramming by acute type 1 inflammatory mediators at their immature stage licenses mature type 1-polarized dendritic cells to reticulate upon subsequent interaction with CD40 ligand-expressing CD4(+) Th cells. Dendritic cell reticulation can support direct antigen transfer for amplification of specific T cell responses and can be positively or negatively regulated by signals from distinct Th cell subsets. Membrane nanotubes not only enhance the ability of immature dendritic cells to sense pathogens and rapidly mobilize nearby antigen-presenting cells in the peripheral tissues but also likely support communication of pathogen-related information from mature migratory dendritic cells to resident dendritic cells in lymph nodes. Therefore, the reticulation process facilitates a coordinated multicellular response for the efficient initiation of cell-mediated adaptive immune responses. Herein, we discuss studies focused on the molecular mechanisms of membrane nanotube formation, structure, and function in the context of immunity and how pathogens, such as HIV-1, may use dendritic cell reticulation to circumvent host defenses.
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Affiliation(s)
- C R Zaccard
- Department of Infectious Diseases and Microbiology, University of Pittsburgh, Pennsylvania, USA and
| | - C R Rinaldo
- Department of Infectious Diseases and Microbiology, University of Pittsburgh, Pennsylvania, USA and Department of Pathology, University of Pittsburgh, Pennsylvania, USA
| | - R B Mailliard
- Department of Infectious Diseases and Microbiology, University of Pittsburgh, Pennsylvania, USA and
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73
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Vassallo CN, Wall D. Tissue repair in myxobacteria: A cooperative strategy to heal cellular damage. Bioessays 2016; 38:306-15. [PMID: 26898360 DOI: 10.1002/bies.201500132] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Damage repair is a fundamental requirement of all life as organisms find themselves in challenging and fluctuating environments. In particular, damage to the barrier between an organism and its environment (e.g. skin, plasma membrane, bacterial cell envelope) is frequent because these organs/organelles directly interact with the external world. Here, we discuss the general strategies that bacteria use to cope with damage to their cell envelope and their repair limits. We then describe a novel damage-coping mechanism used by multicellular myxobacteria. We propose that cell-cell transfer of membrane material within a population serves as a wound-healing strategy and provide evidence for its utility. We suggest that--similar to how tissues in eukaryotes have evolved cooperative methods of damage repair--so too have some bacteria that live a multicellular lifestyle.
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Affiliation(s)
| | - Daniel Wall
- Department of Molecular Biology, University of Wyoming, Laramie, WY, USA
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74
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Rocca CJ, Kreymerman A, Ur SN, Frizzi KE, Naphade S, Lau A, Tran T, Calcutt NA, Goldberg JL, Cherqui S. Treatment of Inherited Eye Defects by Systemic Hematopoietic Stem Cell Transplantation. Invest Ophthalmol Vis Sci 2016; 56:7214-23. [PMID: 26540660 DOI: 10.1167/iovs.15-17107] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
PURPOSE Cystinosis is caused by a deficiency in the lysosomal cystine transporter, cystinosin (CTNS gene), resulting in cystine crystal accumulation in tissues. In eyes, crystals accumulate in the cornea causing photophobia and eventually blindness. Hematopoietic stem progenitor cells (HSPCs) rescue the kidney in a mouse model of cystinosis. We investigated the potential for HSPC transplantation to treat corneal defects in cystinosis. METHODS We isolated HSPCs from transgenic DsRed mice and systemically transplanted irradiated Ctns-/- mice. A year posttransplantation, we investigated the fate and function of HSPCs by in vivo confocal and fluorescence microscopy (IVCM), quantitative RT-PCR (RT-qPCR), mass spectrometry, histology, and by measuring the IOP. To determine the mechanism by which HSPCs may rescue disease cells, we transplanted Ctns-/- mice with Ctns-/- DsRed HSPCs virally transduced to express functional CTNS-eGFP fusion protein. RESULTS We found that a single systemic transplantation of wild-type HSPCs prevented ocular pathology in the Ctns-/- mice. Engraftment-derived HSPCs were detected within the cornea, and also in the sclera, ciliary body, retina, choroid, and lens. Transplantation of HSPC led to substantial decreases in corneal cystine crystals, restoration of normal corneal thickness, and lowered IOP in mice with high levels of donor-derived cell engraftment. Finally, we found that HSPC-derived progeny differentiated into macrophages, which displayed tunneling nanotubes capable of transferring cystinosin-bearing lysosomes to diseased cells. CONCLUSIONS To our knowledge, this is the first demonstration that HSPCs can rescue hereditary corneal defects, and supports a new potential therapeutic strategy for treating ocular pathologies.
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Affiliation(s)
- Celine J Rocca
- Department of Pediatrics Division of Genetics, University of California, San Diego, La Jolla, California, United States
| | - Alexander Kreymerman
- Shiley Eye Center, University of California, San Diego, California, United States
| | - Sarah N Ur
- Department of Pediatrics Division of Genetics, University of California, San Diego, La Jolla, California, United States
| | - Katie E Frizzi
- Department of Pathology, University of California, San Diego, California, United States
| | - Swati Naphade
- Department of Pediatrics Division of Genetics, University of California, San Diego, La Jolla, California, United States
| | - Athena Lau
- Department of Pediatrics Division of Genetics, University of California, San Diego, La Jolla, California, United States
| | - Tammy Tran
- Shiley Eye Center, University of California, San Diego, California, United States
| | - Nigel A Calcutt
- Department of Pathology, University of California, San Diego, California, United States
| | - Jeffrey L Goldberg
- Shiley Eye Center, University of California, San Diego, California, United States 4Byers Eye Institute, Stanford University, Palo Alto, California, United States
| | - Stephanie Cherqui
- Department of Pediatrics Division of Genetics, University of California, San Diego, La Jolla, California, United States
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75
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Victoria GS, Arkhipenko A, Zhu S, Syan S, Zurzolo C. Astrocyte-to-neuron intercellular prion transfer is mediated by cell-cell contact. Sci Rep 2016; 6:20762. [PMID: 26857744 PMCID: PMC4746738 DOI: 10.1038/srep20762] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Accepted: 01/07/2016] [Indexed: 02/04/2023] Open
Abstract
Prion diseases are caused by misfolding of the cellular protein PrP(C) to an infectious conformer, PrP(Sc). Intercellular PrP(Sc) transfer propagates conversion and allows infectivity to move from the periphery to the brain. However, how prions spread between cells of the central nervous system is unclear. Astrocytes are specialized non-neuronal cells within the brain that have a number of functions indispensable for brain homeostasis. Interestingly, they are one of the earliest sites of prion accumulation in the brain. A fundamental question arising from this observation is whether these cells are involved in intercellular prion transfer and thereby disease propagation. Using co-culture systems between primary infected astrocytes and granule neurons or neuronal cell lines, we provide direct evidence that prion-infected astrocytes can disseminate prion to neurons. Though astrocytes are capable of secreting PrP, this is an inefficient method of transferring prion infectivity. Efficient transfer required co-culturing and direct cell contact. Astrocytes form numerous intercellular connections including tunneling nanotubes, containing PrP(Sc), often colocalized with endolysosomal vesicles, which may constitute the major mechanism of transfer. Because of their role in intercellular transfer of prions astrocytes may influence progression of the disease.
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Affiliation(s)
- Guiliana Soraya Victoria
- Unité Trafic Membranaire et Pathogenèse, Institut Pasteur, 25-28 Rue du Docteur Roux, 75724 Paris CEDEX 15, France
| | - Alexander Arkhipenko
- Unité Trafic Membranaire et Pathogenèse, Institut Pasteur, 25-28 Rue du Docteur Roux, 75724 Paris CEDEX 15, France
| | - Seng Zhu
- Unité Trafic Membranaire et Pathogenèse, Institut Pasteur, 25-28 Rue du Docteur Roux, 75724 Paris CEDEX 15, France
| | - Sylvie Syan
- Unité Trafic Membranaire et Pathogenèse, Institut Pasteur, 25-28 Rue du Docteur Roux, 75724 Paris CEDEX 15, France
| | - Chiara Zurzolo
- Unité Trafic Membranaire et Pathogenèse, Institut Pasteur, 25-28 Rue du Docteur Roux, 75724 Paris CEDEX 15, France
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Rog-Zielinska EA, Norris RA, Kohl P, Markwald R. The Living Scar – Cardiac Fibroblasts and the Injured Heart. Trends Mol Med 2016. [DOI: 10.1016/j.molmed.2015.12.006 order by 1-- -] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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77
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Rog-Zielinska EA, Norris RA, Kohl P, Markwald R. The Living Scar – Cardiac Fibroblasts and the Injured Heart. Trends Mol Med 2016. [DOI: 10.1016/j.molmed.2015.12.006 and 1880=1880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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78
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Rog-Zielinska EA, Norris RA, Kohl P, Markwald R. The Living Scar – Cardiac Fibroblasts and the Injured Heart. Trends Mol Med 2016. [DOI: 10.1016/j.molmed.2015.12.006 order by 8029-- -] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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79
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Rog-Zielinska EA, Norris RA, Kohl P, Markwald R. The Living Scar – Cardiac Fibroblasts and the Injured Heart. Trends Mol Med 2016. [DOI: 10.1016/j.molmed.2015.12.006 order by 8029-- awyx] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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80
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Rog-Zielinska EA, Norris RA, Kohl P, Markwald R. The Living Scar – Cardiac Fibroblasts and the Injured Heart. Trends Mol Med 2016. [DOI: 10.1016/j.molmed.2015.12.006 order by 1-- gadu] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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81
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Rog-Zielinska EA, Norris RA, Kohl P, Markwald R. The Living Scar – Cardiac Fibroblasts and the Injured Heart. Trends Mol Med 2016. [DOI: 10.1016/j.molmed.2015.12.006 order by 1-- #] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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82
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Rog-Zielinska EA, Norris RA, Kohl P, Markwald R. The Living Scar – Cardiac Fibroblasts and the Injured Heart. Trends Mol Med 2016. [DOI: 10.1016/j.molmed.2015.12.006 order by 8029-- #] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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83
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Rog-Zielinska EA, Norris RA, Kohl P, Markwald R. The Living Scar--Cardiac Fibroblasts and the Injured Heart. Trends Mol Med 2016; 22:99-114. [PMID: 26776094 DOI: 10.1016/j.molmed.2015.12.006] [Citation(s) in RCA: 117] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Revised: 12/16/2015] [Accepted: 12/18/2015] [Indexed: 12/22/2022]
Abstract
Cardiac scars, often dubbed 'dead tissue', are very much alive, with heterocellular activity contributing to the maintenance of structural and mechanical integrity following heart injury. To form a scar, non-myocytes such as fibroblasts are recruited from intra- and extra-cardiac sources. Fibroblasts perform important autocrine and paracrine signaling functions. They also establish mechanical and, as is increasingly evident, electrical junctions with other cells. While fibroblasts were previously thought to act simply as electrical insulators, they may be electrically connected among themselves and, under some circumstances, to other cells including cardiomyocytes. A better understanding of these biophysical interactions will help to target scar structure and function, and will facilitate the development of novel therapies aimed at modifying scar properties for patient benefit.
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Affiliation(s)
- Eva A Rog-Zielinska
- Institute for Experimental Cardiovascular Medicine, University of Freiburg, Freiburg, Germany; National Heart and Lung Institute, Imperial College London, London, UK
| | - Russell A Norris
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC, USA
| | - Peter Kohl
- Institute for Experimental Cardiovascular Medicine, University of Freiburg, Freiburg, Germany; National Heart and Lung Institute, Imperial College London, London, UK.
| | - Roger Markwald
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC, USA
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84
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McCoy-Simandle K, Hanna SJ, Cox D. Exosomes and nanotubes: Control of immune cell communication. Int J Biochem Cell Biol 2015; 71:44-54. [PMID: 26704468 DOI: 10.1016/j.biocel.2015.12.006] [Citation(s) in RCA: 89] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Revised: 12/01/2015] [Accepted: 12/10/2015] [Indexed: 12/19/2022]
Abstract
Cell-cell communication is critical to coordinate the activity and behavior of a multicellular organism. The cells of the immune system not only must communicate with similar cells, but also with many other cell types in the body. Therefore, the cells of the immune system have evolved multiple ways to communicate. Exosomes and tunneling nanotubes (TNTs) are two means of communication used by immune cells that contribute to immune functions. Exosomes are small membrane vesicles secreted by most cell types that can mediate intercellular communication and in the immune system they are proposed to play a role in antigen presentation and modulation of gene expression. TNTs are membranous structures that mediate direct cell-cell contact over several cell diameters in length (and possibly longer) and facilitate the interaction and/or the transfer of signals, material and other cellular organelles between connected cells. Recent studies have revealed additional, but sometimes conflicting, structural and functional features of both exosomes and TNTs. Despite the new and exciting information in exosome and TNT composition, origin and in vitro function, biologically significant functions are still being investigated and determined. In this review, we discuss the current field regarding exosomes and TNTs in immune cells providing evaluation and perspectives of the current literature.
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Affiliation(s)
- Kessler McCoy-Simandle
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1300 Morris Park Ave, Gruss MRRC 306, Bronx, NY 10461, USA.
| | - Samer J Hanna
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1300 Morris Park Ave, Gruss MRRC 306, Bronx, NY 10461, USA.
| | - Dianne Cox
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1300 Morris Park Ave, Gruss MRRC 306, Bronx, NY 10461, USA; Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, 1300 Morris Park Ave, Gruss MRRC 306, Bronx, NY 10461, USA; Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, 1300 Morris Park Ave, Gruss MRRC 306, Bronx, NY 10461, USA.
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85
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B-cell precursor acute lymphoblastic leukemia cells use tunneling nanotubes to orchestrate their microenvironment. Blood 2015; 126:2404-14. [DOI: 10.1182/blood-2015-03-634238] [Citation(s) in RCA: 122] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Accepted: 07/28/2015] [Indexed: 12/23/2022] Open
Abstract
Key Points
Primary BCP-ALL cells use tunneling nanotubes to signal to mesenchymal stromal cells and thereby trigger cytokine secretion. Inhibiting tunneling nanotube signaling is a promising approach to induce apoptosis and sensitize BCP-ALL cells toward prednisolone.
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86
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Extracellular Vesicles: Evolving Factors in Stem Cell Biology. Stem Cells Int 2015; 2016:1073140. [PMID: 26649044 PMCID: PMC4663346 DOI: 10.1155/2016/1073140] [Citation(s) in RCA: 166] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Revised: 07/09/2015] [Accepted: 07/16/2015] [Indexed: 12/18/2022] Open
Abstract
Stem cells are proposed to continuously secrete trophic factors that potentially serve as mediators of autocrine and paracrine activities, associated with reprogramming of the tumor microenvironment, tissue regeneration, and repair. Hitherto, significant efforts have been made to understand the level of underlying paracrine activities influenced by stem cell secreted trophic factors, as little is known about these interactions. Recent findings, however, elucidate this role by reporting the effects of stem cell derived extracellular vesicles (EVs) that mimic the phenotypes of the cells from which they originate. Exchange of genetic information utilizing persistent bidirectional communication mediated by stem cell-EVs could regulate stemness, self-renewal, and differentiation in stem cells and their subpopulations. This review therefore discusses stem cell-EVs as evolving communication factors in stem cell biology, focusing on how they regulate cell fates by inducing persistent and prolonged genetic reprogramming of resident cells in a paracrine fashion. In addition, we address the role of stem cell-secreted vesicles in shaping the tumor microenvironment and immunomodulation and in their ability to stimulate endogenous repair processes during tissue damage. Collectively, these functions ensure an enormous potential for future therapies.
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87
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Aguzzi A, Lakkaraju AKK. Cell Biology of Prions and Prionoids: A Status Report. Trends Cell Biol 2015; 26:40-51. [PMID: 26455408 DOI: 10.1016/j.tcb.2015.08.007] [Citation(s) in RCA: 98] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Revised: 08/08/2015] [Accepted: 08/24/2015] [Indexed: 11/18/2022]
Abstract
The coalescence of proteins into highly ordered aggregates is a hallmark of protein misfolding disorders (PMDs), which, when affecting the central nervous system, lead to progressive neurodegeneration. Although the chemical identity and the topology of each culprit protein are unique, the principles governing aggregation and propagation are strikingly stereotypical. It is now clear that such protein aggregates can spread from cell to cell and eventually affect entire organ systems - similarly to prion diseases. However, because most aggregates are not found to transmit between individuals, they are not infectious sensu strictiori. Therefore, they are not identical to prions and we prefer to define them as 'prionoids'. Here we review recent advances in understanding the toxicity of protein aggregation affecting the brain.
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Affiliation(s)
- Adriano Aguzzi
- Institute of Neuropathology, University of Zürich, CH-8091 Zürich, Switzerland.
| | - Asvin K K Lakkaraju
- Institute of Neuropathology, University of Zürich, CH-8091 Zürich, Switzerland.
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88
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Naphade S, Sharma J, Gaide Chevronnay HP, Shook MA, Yeagy BA, Rocca CJ, Ur SN, Lau AJ, Courtoy PJ, Cherqui S. Brief reports: Lysosomal cross-correction by hematopoietic stem cell-derived macrophages via tunneling nanotubes. Stem Cells 2015; 33:301-9. [PMID: 25186209 DOI: 10.1002/stem.1835] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Accepted: 07/23/2014] [Indexed: 12/26/2022]
Abstract
Despite controversies on the potential of hematopoietic stem cells (HSCs) to promote tissue repair, we previously showed that HSC transplantation could correct cystinosis, a multisystemic lysosomal storage disease, caused by a defective lysosomal membrane cystine transporter, cystinosin (CTNS gene). Addressing the cellular mechanisms, we here report vesicular cross-correction after HSC differentiation into macrophages. Upon coculture with cystinotic fibroblasts, macrophages produced tunneling nanotubes (TNTs) allowing transfer of cystinosin-bearing lysosomes into Ctns-deficient cells, which exploited the same route to retrogradely transfer cystine-loaded lysosomes to macrophages, providing a bidirectional correction mechanism. TNT formation was enhanced by contact with diseased cells. In vivo, HSCs grafted to cystinotic kidneys also generated nanotubular extensions resembling invadopodia that crossed the dense basement membranes and delivered cystinosin into diseased proximal tubular cells. This is the first report of correction of a genetic lysosomal defect by bidirectional vesicular exchange via TNTs and suggests broader potential for HSC transplantation for other disorders due to defective vesicular proteins.
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Affiliation(s)
- Swati Naphade
- Division of Genetics, Department of Pediatrics, University of California, La Jolla, San Diego, California, USA
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89
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Bénard M, Schapman D, Lebon A, Monterroso B, Bellenger M, Le Foll F, Pasquier J, Vaudry H, Vaudry D, Galas L. Structural and functional analysis of tunneling nanotubes (TnTs) using gCW STED and gconfocal approaches. Biol Cell 2015; 107:419-25. [PMID: 26094971 DOI: 10.1111/boc.201500004] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Accepted: 06/17/2015] [Indexed: 01/01/2023]
Abstract
BACKGROUND INFORMATION Tunneling nanotubes (TnTs) are thin plasma membrane bridges mediating transfers of materials and signals between cells. Heterogeneity of heterocellular and homocellular TnTs is largely described but ultrafine imaging of these light-sensitive floating nanometric structures represents a real challenge in microscopy. We propose here imaging strategies designed to dissect structural and dynamic aspects of TnT formation and function in fixed or living PC12 cells. RESULTS Through time-gated Continuous Wave STimulated Emission Depletion (gCW STED) nanoscopy associated with deconvolution, we provided nanoscale details of membrane and cytoskeleton organisations in two subtypes of TnTs, namely type 1 TnT (TnT1) and type 2 TnT (TnT2). In fixed PC12 cells, TnT1 (length, several tens of micrometres; diameter, 100-650 nm) exhibited a large trumpet-shaped origin, a clear cytosolic tunnel and different bud-shaped connections from closed-ended to open-ended tips. TnT1 contained both actin and tubulin. TnT2 (length, max 20 μm, diameter, 70-200 nm) only contained actin without clear cytosolic tunnel. In living PC12 cells, we observed through gCW STED additional details, unrevealed so far, including a filament spindle emerging from an organising centre at the origin of TnT1 and branched or bulbous attachments of TnT2. However, the power of depletion laser in STED nanoscopy was deleterious for TnTs and prolonged time-lapse experiments were almost prohibited. By circumventing the hazard of photoxicity, we were able to monitor dynamics of bud-shaped tips and intercellular transfer of wheat germ agglutinin labelled cellular elements through time-gated confocal microscopy. CONCLUSIONS Our work identified new structural characteristics of two subtypes of TnTs in PC12 cells as well as dynamics of formation and transfer through complementary imaging methods combined with image processing. Therefore, we could achieve maximum lateral resolution and sample preservation during acquisitions to reveal new insights into TnT studies. SIGNIFICANCE Due to large disparity of TnT-like structures in neuronal, immune, cancer or epithelial cells, high- and superresolution approaches can be utilised for full characterisation of these yet poorly understood routes of cell-to-cell communication.
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Affiliation(s)
- Magalie Bénard
- Cell imaging platform of Normandy (PRIMACEN), Infrastructure en Biologie, Santé et Agronomie (IBiSA), Institut National de la Santé et de la Recherche Médicale (Inserm), Mont-Saint-Aignan, France.,Normandie University, Institute for Research and Innovation in Biomedicine (IRIB), Rouen, France
| | - Damien Schapman
- Cell imaging platform of Normandy (PRIMACEN), Infrastructure en Biologie, Santé et Agronomie (IBiSA), Institut National de la Santé et de la Recherche Médicale (Inserm), Mont-Saint-Aignan, France.,Normandie University, Institute for Research and Innovation in Biomedicine (IRIB), Rouen, France
| | - Alexis Lebon
- Cell imaging platform of Normandy (PRIMACEN), Infrastructure en Biologie, Santé et Agronomie (IBiSA), Institut National de la Santé et de la Recherche Médicale (Inserm), Mont-Saint-Aignan, France.,Normandie University, Institute for Research and Innovation in Biomedicine (IRIB), Rouen, France
| | - Baptiste Monterroso
- Cell imaging platform of Normandy (PRIMACEN), Infrastructure en Biologie, Santé et Agronomie (IBiSA), Institut National de la Santé et de la Recherche Médicale (Inserm), Mont-Saint-Aignan, France.,Normandie University, Institute for Research and Innovation in Biomedicine (IRIB), Rouen, France
| | - Marine Bellenger
- Cell imaging platform of Normandy (PRIMACEN), Infrastructure en Biologie, Santé et Agronomie (IBiSA), Institut National de la Santé et de la Recherche Médicale (Inserm), Mont-Saint-Aignan, France.,Normandie University, Institute for Research and Innovation in Biomedicine (IRIB), Rouen, France
| | - Frank Le Foll
- UMR-I 02 INERIS-URCA-ULH SEBIO/Unité Stress Environnementaux et BIOsurveillance des milieux aquatiques, Université du Havre, France
| | - Jennifer Pasquier
- UMR-I 02 INERIS-URCA-ULH SEBIO/Unité Stress Environnementaux et BIOsurveillance des milieux aquatiques, Université du Havre, France.,Department of Genetic Medicine, Weill Cornell Medical College, New York, NY, USA.,Stem Cell and Microenvironment Laboratory, Weill Cornell Medical College in Qatar, Doha, Qatar
| | - Hubert Vaudry
- Cell imaging platform of Normandy (PRIMACEN), Infrastructure en Biologie, Santé et Agronomie (IBiSA), Institut National de la Santé et de la Recherche Médicale (Inserm), Mont-Saint-Aignan, France.,Normandie University, Institute for Research and Innovation in Biomedicine (IRIB), Rouen, France
| | - David Vaudry
- Cell imaging platform of Normandy (PRIMACEN), Infrastructure en Biologie, Santé et Agronomie (IBiSA), Institut National de la Santé et de la Recherche Médicale (Inserm), Mont-Saint-Aignan, France.,Normandie University, Institute for Research and Innovation in Biomedicine (IRIB), Rouen, France
| | - Ludovic Galas
- Cell imaging platform of Normandy (PRIMACEN), Infrastructure en Biologie, Santé et Agronomie (IBiSA), Institut National de la Santé et de la Recherche Médicale (Inserm), Mont-Saint-Aignan, France.,Normandie University, Institute for Research and Innovation in Biomedicine (IRIB), Rouen, France
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90
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Astanina K, Koch M, Jüngst C, Zumbusch A, Kiemer AK. Lipid droplets as a novel cargo of tunnelling nanotubes in endothelial cells. Sci Rep 2015; 5:11453. [PMID: 26095213 PMCID: PMC4476149 DOI: 10.1038/srep11453] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Accepted: 05/26/2015] [Indexed: 12/17/2022] Open
Abstract
Intercellular communication is a fundamental process in the development and functioning of multicellular organisms. Recently, an essentially new type of intercellular communication, based on thin membrane channels between cells, has been reported. These structures, termed intercellular or tunnelling nanotubes (TNTs), permit the direct exchange of various components or signals (e.g., ions, proteins, or organelles) between non-adjacent cells at distances over 100 μm. Our studies revealed the presence of tunnelling nanotubes in microvascular endothelial cells (HMEC-1). The TNTs were studied with live cell imaging, environmental scanning electron microscopy (ESEM), and coherent anti-Stokes Raman scattering spectroscopy (CARS). Tunneling nanotubes showed marked persistence: the TNTs could connect cells over long distances (up to 150 μm) for several hours. Several cellular organelles were present in TNTs, such as lysosomes and mitochondria. Moreover, we could identify lipid droplets as a novel type of cargo in the TNTs. Under angiogenic conditions (VEGF treatment) the number of lipid droplets increased significantly. Arachidonic acid application not only increased the number of lipid droplets but also tripled the extent of TNT formation. Taken together, our results provide the first demonstration of lipid droplets as a cargo of TNTs and thereby open a new field in intercellular communication research.
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Affiliation(s)
- Ksenia Astanina
- Department of Pharmacy, Pharmaceutical Biology, Saarland University, Saarbrücken, Germany
| | - Marcus Koch
- Leibniz Institute for New Materials, Saarbrücken, Germany
| | | | | | - Alexandra K. Kiemer
- Department of Pharmacy, Pharmaceutical Biology, Saarland University, Saarbrücken, Germany
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91
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Wang X, Yu X, Xie C, Tan Z, Tian Q, Zhu D, Liu M, Guan Y. Rescue of Brain Function Using Tunneling Nanotubes Between Neural Stem Cells and Brain Microvascular Endothelial Cells. Mol Neurobiol 2015; 53:2480-8. [DOI: 10.1007/s12035-015-9225-z] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Accepted: 05/21/2015] [Indexed: 01/19/2023]
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92
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Scholkmann F. Two emerging topics regarding long-range physical signaling in neurosystems: Membrane nanotubes and electromagnetic fields. J Integr Neurosci 2015; 14:135-53. [DOI: 10.1142/s0219635215300115] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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93
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Abounit S, Delage E, Zurzolo C. Identification and Characterization of Tunneling Nanotubes for Intercellular Trafficking. ACTA ACUST UNITED AC 2015; 67:12.10.1-12.10.21. [PMID: 26061240 DOI: 10.1002/0471143030.cb1210s67] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Tunneling nanotubes (TNTs) are thin membranous channels providing direct cytoplasmic connection between remote cells. They are commonly observed in different cell cultures and increasing evidence supports their role in intercellular communication and pathogen transfer. However, the study of TNTs presents several pitfalls (e.g., difficulty in preserving such delicate structures, possible confusion with other protrusions, structural and functional heterogeneity, etc.) and therefore requires thoroughly designed approaches. The methods described in this unit represent a guideline for the characterization of TNTs (or TNT-like structures) in cell culture. Specifically, optimized protocols to (1) identify TNTs and the cytoskeletal elements present inside them; (2) evaluate TNT frequency in cell culture; (3) unambiguously distinguish them from other cellular connections or protrusions; and (4) monitor their formation in living cells are provided. Finally, this unit describes how to assess TNT-mediated cell-to-cell transfer of cellular components, which is a fundamental criterion for identifying functional TNTs.
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Affiliation(s)
- Saïda Abounit
- Unité de Traffic Membranaire et Pathogenèse, Département de Biologie Cellulaire et Infection, Institut Pasteur, Paris, France.,These authors contributed equally to this work
| | - Elise Delage
- Unité de Traffic Membranaire et Pathogenèse, Département de Biologie Cellulaire et Infection, Institut Pasteur, Paris, France.,These authors contributed equally to this work
| | - Chiara Zurzolo
- Unité de Traffic Membranaire et Pathogenèse, Département de Biologie Cellulaire et Infection, Institut Pasteur, Paris, France.,Corresponding author
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94
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Carandini T, Colombo F, Finardi A, Casella G, Garzetti L, Verderio C, Furlan R. Microvesicles: What is the Role in Multiple Sclerosis? Front Neurol 2015; 6:111. [PMID: 26074867 PMCID: PMC4443736 DOI: 10.3389/fneur.2015.00111] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2015] [Accepted: 05/04/2015] [Indexed: 12/21/2022] Open
Abstract
Microvesicles are a recently described way of cell communication that has been implicated in a number of biological processes, including neuroinflammation. Widely investigated as biomarkers in oncology and neurological disorders, little is known of the role of microvesicles in the pathogenesis of diseases such as multiple sclerosis (MS). Several evidences suggest that pro-inflammatory microglia and infiltrating macrophages release microvesicles that spread inflammatory signals and alter neuronal functions. We review here available information on microvesicles, with a special focus on microglia and macrophage microvesicles, in the pathogenesis of MS, and as potential biomarkers and therapeutic targets.
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Affiliation(s)
- Tiziana Carandini
- Division of Neuroscience, Institute of Experimental Neurology, San Raffaele Scientific Institute , Milan , Italy
| | - Federico Colombo
- Division of Neuroscience, Institute of Experimental Neurology, San Raffaele Scientific Institute , Milan , Italy
| | - Annamaria Finardi
- Division of Neuroscience, Institute of Experimental Neurology, San Raffaele Scientific Institute , Milan , Italy
| | - Giacomo Casella
- Division of Neuroscience, Institute of Experimental Neurology, San Raffaele Scientific Institute , Milan , Italy
| | - Livia Garzetti
- Division of Neuroscience, Institute of Experimental Neurology, San Raffaele Scientific Institute , Milan , Italy
| | - Claudia Verderio
- CNR Institute of Neuroscience , Milan , Italy ; IRCCS Humanitas , Rozzano , Italy
| | - Roberto Furlan
- Division of Neuroscience, Institute of Experimental Neurology, San Raffaele Scientific Institute , Milan , Italy
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95
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Agnati LF, Fuxe K. Extracellular-vesicle type of volume transmission and tunnelling-nanotube type of wiring transmission add a new dimension to brain neuro-glial networks. Philos Trans R Soc Lond B Biol Sci 2015; 369:rstb.2013.0505. [PMID: 25135966 DOI: 10.1098/rstb.2013.0505] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Two major types of intercellular communication are found in the central nervous system (CNS), namely wiring transmission (WT; point-to-point communication via private channels, e.g. synaptic transmission) and volume transmission (VT; communication in the extracellular fluid and in the cerebrospinal fluid). Volume and synaptic transmission become integrated because their chemical signals activate different types of interacting receptors in heteroreceptor complexes located synaptically and extrasynaptically in the plasma membrane. In VT, we focus on the role of the extracellular-vesicle type of VT, and in WT, on the potential role of the tunnelling-nanotube (TNT) type of WT. The so-called exosomes appear to be the major vesicular carrier for intercellular communication but the larger microvesicles also participate. Extracellular vesicles are released from cultured cortical neurons and different types of glial cells and modulate the signalling of the neuronal-glial networks of the CNS. This type of VT has pathological relevance, and epigenetic mechanisms may participate in the modulation of extracellular-vesicle-mediated VT. Gerdes and co-workers proposed the existence of a novel type of WT based on TNTs, which are straight transcellular channels leading to the formation in vitro of syncytial cellular networks found also in neuronal and glial cultures.
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Affiliation(s)
| | - Kjell Fuxe
- Department of Neuroscience, Karolinska Institutet, Retzius väg 8, 17177 Stockholm, Sweden
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96
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Mojica SA, Hovis KM, Frieman MB, Tran B, Hsia RC, Ravel J, Jenkins-Houk C, Wilson KL, Bavoil PM. SINC, a type III secreted protein of Chlamydia psittaci, targets the inner nuclear membrane of infected cells and uninfected neighbors. Mol Biol Cell 2015; 26:1918-34. [PMID: 25788290 PMCID: PMC4436835 DOI: 10.1091/mbc.e14-11-1530] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Accepted: 03/06/2015] [Indexed: 12/31/2022] Open
Abstract
SINC, a new type III secreted protein of the avian and human pathogen Chlamydia psittaci, uniquely targets the nuclear envelope of C. psittaci-infected cells and uninfected neighboring cells. Digitonin-permeabilization studies of SINC-GFP-transfected HeLa cells indicate that SINC targets the inner nuclear membrane. SINC localization at the nuclear envelope was blocked by importazole, confirming SINC import into the nucleus. Candidate partners were identified by proximity to biotin ligase-fused SINC in HEK293 cells and mass spectrometry (BioID). This strategy identified 22 candidates with high confidence, including the nucleoporin ELYS, lamin B1, and four proteins (emerin, MAN1, LAP1, and LBR) of the inner nuclear membrane, suggesting that SINC interacts with host proteins that control nuclear structure, signaling, chromatin organization, and gene silencing. GFP-SINC association with the native LEM-domain protein emerin, a conserved component of nuclear "lamina" structure, or with a complex containing emerin was confirmed by GFP pull down. Our findings identify SINC as a novel bacterial protein that targets the nuclear envelope with the capability of globally altering nuclear envelope functions in the infected host cell and neighboring uninfected cells. These properties may contribute to the aggressive virulence of C. psittaci.
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Affiliation(s)
- Sergio A Mojica
- Department of Microbial Pathogenesis, University of Maryland School of Dentistry, Baltimore, MD 21201
| | - Kelley M Hovis
- Department of Microbial Pathogenesis, University of Maryland School of Dentistry, Baltimore, MD 21201
| | - Matthew B Frieman
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD 20201
| | - Bao Tran
- Mass Spectrometry Center, University of Maryland School of Pharmacy, Baltimore, MD 21201
| | - Ru-ching Hsia
- Core Imaging Facility and Department of Neural and Pain Sciences, University of Maryland School of Dentistry, Baltimore, MD 21201
| | - Jacques Ravel
- Institute for Genome Science, University of Maryland School of Medicine, Baltimore, MD 20201
| | - Clifton Jenkins-Houk
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD 21205
| | - Katherine L Wilson
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD 21205
| | - Patrik M Bavoil
- Department of Microbial Pathogenesis, University of Maryland School of Dentistry, Baltimore, MD 21201
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97
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Pais V, Pais ES. Intercellular communication by extracellular vesicles with emphasis on the roles of cordocytes in the human brain. An ultrastructural study. Ultrastruct Pathol 2015; 39:177-86. [PMID: 25569160 DOI: 10.3109/01913123.2014.981327] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
We describe in this work the presence of extracellular vesicles (EVs) along different cell types, especially cordocytes, in various clinical conditions of the human brain (atherothrombotic disease, cerebral tumors, hygroma durae matris, intracerebral cysts, Moyamoya disease and parenchymatous hematoma) using transmission electron microscopy (TEM). EVs, illustrated as exosomes and microvesicles, were causally related to cell-to-cell communication, and other vital functions of resident cells around the brain parenchyma, either around the cortical vessels or into the subarachnoid space and the reticular arachnoid. Our direct demonstration by TEM of these information transporters in all locations and situations where the cordocytes play coordinating and regulating roles, producing and delivering a significant number of EVs to their targets, remains to be better documented in future studies. This first study on this topic showed clearly that EVs can be important modulators of cell functions with roles in cell activation, differentiation, phenotypic change, cancer progression, from precursor/stem cells to tumoral phenotypes, because EVs are released en masse during key interactions and certain moments.
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Affiliation(s)
- Viorel Pais
- Independent Researcher , Bucharest , Romania and
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98
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Gözen I, Jesorka A. Lipid nanotube networks: Biomimetic Cell-to-Cell Communication and Soft-Matter Technology. NANOFABRICATION 2015. [DOI: 10.1515/nanofab-2015-0003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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99
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Zhu S, Victoria GS, Marzo L, Ghosh R, Zurzolo C. Prion aggregates transfer through tunneling nanotubes in endocytic vesicles. Prion 2015; 9:125-35. [PMID: 25996400 PMCID: PMC4601206 DOI: 10.1080/19336896.2015.1025189] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2014] [Revised: 02/07/2015] [Accepted: 02/26/2015] [Indexed: 01/31/2023] Open
Abstract
Transmissible spongiform encephalopathies (TSEs) are a group of neurodegenerative diseases caused by the misfolding of the cellular prion protein to an infectious form PrP(Sc). The intercellular transfer of PrP(Sc) is a question of immediate interest as the cell-to-cell movement of the infectious particle causes the inexorable propagation of disease. We have previously identified tunneling nanotubes (TNTs) as one mechanism by which PrP(Sc) can move between cells. Here we investigate further the details of this mechanism and show that PrP(Sc) travels within TNTs in endolysosomal vesicles. Additionally we show that prion infection of CAD cells increases both the number of TNTs and intercellular transfer of membranous vesicles, thereby possibly playing an active role in its own intercellular transfer via TNTs.
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Key Words
- Ab, antibody
- CFP, cyan fluorescent protein
- ER, endoplasmic reticulum
- ERC, endocytic recycling compartment
- GFP, green fluorescent protein
- PM, plasma membrane
- PrPC, cellular prion protein
- PrPSc, scrapie prion protein
- RFP, red fluorescent protein
- TNTs, tunneling nanotubes
- TSEs, transmissible spongiform encephalopathies
- endosomes
- neuronal cells
- prion
- transfer
- tunneling nanotubes
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Affiliation(s)
- Seng Zhu
- Unité Trafic Membranaire et Pathogenese, Institut Pasteur, Paris CEDEX 15, France
| | | | - Ludovica Marzo
- Unité Trafic Membranaire et Pathogenese, Institut Pasteur, Paris CEDEX 15, France
| | - Rupam Ghosh
- Unité Trafic Membranaire et Pathogenese, Institut Pasteur, Paris CEDEX 15, France
| | - Chiara Zurzolo
- Unité Trafic Membranaire et Pathogenese, Institut Pasteur, Paris CEDEX 15, France
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100
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Engel PA. Does metabolic failure at the synapse cause Alzheimer's disease? Med Hypotheses 2014; 83:802-8. [PMID: 25456790 DOI: 10.1016/j.mehy.2014.10.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 10/15/2014] [Indexed: 01/01/2023]
Abstract
Alzheimer's disease (AD) a neurodegenerative disorder of widely distributed cortical networks evolves over years while A beta (Aβ) oligomer neurotoxicity occurs within seconds to minutes. This disparity combined with disappointing outcomes of anti-amyloid clinical trials challenges the centrality of Aβ as principal mediator of neurodegeneration. Reconsideration of late life AD as the end-product of intermittent regional failure of the neuronal support system to meet the needs of vulnerable brain areas offers an alternative point of view. This model introduces four ideas: (1) That Aβ is a synaptic signaling peptide that becomes toxic in circumstances of metabolic stress. (2) That intense synaptic energy and maintenance requirements of cortical hubs may exceed resources during peak demand initiating a neurotoxic cascade in these selectively vulnerable regions. (3) That axonal transport to and from neuron soma cannot account fully for high mitochondrial densities and other requirements of distant terminal axons. (4) That neurons as specialists in information management, delegate generic support functions to astrocytes and other cell types. Astrocytes use intercellular transport by exosomes and tunneling nanotubes (TNTs) to deliver mitochondria, substrates and protein reprocessing services to axonal sites distant from neuronal soma. This viewpoint implicates the brain's support system and its disruption by various age and disease-related insults as significant mediators of neurodegenerative disease. A better understanding of this system should broaden concepts of neurodegeneration and facilitate development of effective treatments.
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Affiliation(s)
- Peter A Engel
- Geriatric Research, Education and Clinical Center, VA Boston Healthcare System, Harvard Medical School, United States.
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