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Schot M, Araújo-Gomes N, van Loo B, Kamperman T, Leijten J. Scalable fabrication, compartmentalization and applications of living microtissues. Bioact Mater 2023; 19:392-405. [PMID: 35574053 PMCID: PMC9062422 DOI: 10.1016/j.bioactmat.2022.04.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 03/18/2022] [Accepted: 04/06/2022] [Indexed: 10/27/2022] Open
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2
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Thomsen AR, Aldrian C, Bronsert P, Thomann Y, Nanko N, Melin N, Rücker G, Follo M, Grosu AL, Niedermann G, Layer PG, Heselich A, Lund PG. A deep conical agarose microwell array for adhesion independent three-dimensional cell culture and dynamic volume measurement. LAB ON A CHIP 2017; 18:179-189. [PMID: 29211089 DOI: 10.1039/c7lc00832e] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Multicellular spheroids represent a well-established 3D model to study healthy and diseased cells in vitro. The use of conventional 3D cell culture platforms for the generation of multicellular spheroids is limited to cell types that easily self-assemble into spheroids because less adhesive cells fail to form stable aggregates. A high-precision micromoulding technique developed in our laboratory produces deep conical agarose microwell arrays that allow the cultivation of uniform multicellular aggregates, irrespective of the spheroid formation capacity of the cells. Such hydrogel arrays warrant a steady nutrient supply for several weeks, permit live volumetric measurements to monitor cell growth, enable immunohistochemical staining, fluorescence-based microscopy, and facilitate immediate harvesting of cell aggregates. This system also allows co-cultures of two distinct cell types either in direct cell-cell contact or at a distance as the hydrogel permits diffusion of soluble compounds. Notably, we show that co-culture of a breast cancer cell line with bone marrow stromal cells enhances 3D growth of the cancer cells in this system.
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Affiliation(s)
- Andreas R Thomsen
- Department of Radiation Oncology, Medical Center - University of Freiburg, Germany.
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Phenotypic Assays for Characterizing Compound Effects on Induced Pluripotent Stem Cell-Derived Cardiac Spheroids. Assay Drug Dev Technol 2017; 15:280-296. [DOI: 10.1089/adt.2017.792] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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Song W, Tung CK, Lu YC, Pardo Y, Wu M, Das M, Kao DI, Chen S, Ma M. Dynamic self-organization of microwell-aggregated cellular mixtures. SOFT MATTER 2016; 12:5739-5746. [PMID: 27275624 DOI: 10.1039/c6sm00456c] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Cells with different cohesive properties self-assemble in a spatiotemporal and context-dependent manner. Previous studies on cell self-organization mainly focused on the spontaneous structural development within a short period of time during which the cell numbers remained constant. However the effect of cell proliferation over time on the self-organization of cells is largely unexplored. Here, we studied the spatiotemporal dynamics of self-organization of a co-culture of MDA-MB-231 and MCF10A cells seeded in a well defined space (i.e. non-adherent microfabricated wells). When cell-growth was chemically inhibited, high cohesive MCF10A cells formed a core surrounded by low cohesive MDA-MB-231 cells on the periphery, consistent with the differential adhesion hypothesis (DAH). Interestingly, this aggregate morphology was completely inverted when the cells were free to grow. At an initial seeding ratio of 1 : 1 (MDA-MB-231 : MCF10A), the fast growing MCF10A cells segregated in the periphery while the slow growing MDA-MB-231 cells stayed in the core. Another morphology developed at an inequal seeding ratio (4 : 1), that is, the cell mixtures developed a side-by-side aggregate morphology. We conclude that the cell self-organization depends not only on the cell cohesive properties but also on the cell seeding ratio and proliferation. Furthermore, by taking advantage of the cell self-organization, we purified human embryonic stem cells-derived pancreatic progenitors (hESCs-PPs) from co-cultured feeder cells without using any additional tools or labels.
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Affiliation(s)
- Wei Song
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853, USA.
| | - Chih-Kuan Tung
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853, USA. and Department of Physics, North Carolina A&T State University, Greensboro, North Carolina 27411, USA
| | - Yen-Chun Lu
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853, USA.
| | - Yehudah Pardo
- Meinig School of Biomedical Engineering, Cornell University, Ithaca, New York 14853, USA
| | - Mingming Wu
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853, USA.
| | - Moumita Das
- School of Physics and Astronomy, Rochester Institute of Technology, Rochester, New York 14623, USA
| | - Der-I Kao
- Department of Surgery, Weill Medical College of Cornell University, New York City, New York 10065, USA
| | - Shuibing Chen
- Department of Surgery, Weill Medical College of Cornell University, New York City, New York 10065, USA
| | - Minglin Ma
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853, USA.
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Vrij E, Rouwkema J, LaPointe V, van Blitterswijk C, Truckenmüller R, Rivron N. Directed Assembly and Development of Material-Free Tissues with Complex Architectures. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:4032-4039. [PMID: 27000493 DOI: 10.1002/adma.201505723] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 01/19/2016] [Indexed: 06/05/2023]
Abstract
Material-free tissues are assembled using solely cells. Microstructured hydrogel templates and high content screening allow the formation of centimeter-scale tissues with precise architectures. Similar to developing tissues, these contract autonomously, controllably shift shape, self-scaffold by secreting extracellular matrix, and undergo morphogenesis.
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Affiliation(s)
- Erik Vrij
- Department of Complex Tissue Regeneration, MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, Universiteitssingel 40, 6229, ER, Maastricht, The Netherland
| | - Jeroen Rouwkema
- Department of Biomechanical Engineering, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, Drienerlolaan 5, 7522, NB, Enschede, The Netherlands
| | - Vanessa LaPointe
- Department of Complex Tissue Regeneration, MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, Universiteitssingel 40, 6229, ER, Maastricht, The Netherland
| | - Clemens van Blitterswijk
- Department of Complex Tissue Regeneration, MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, Universiteitssingel 40, 6229, ER, Maastricht, The Netherland
| | - Roman Truckenmüller
- Department of Complex Tissue Regeneration, MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, Universiteitssingel 40, 6229, ER, Maastricht, The Netherland
| | - Nicolas Rivron
- Department of Complex Tissue Regeneration, MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, Universiteitssingel 40, 6229, ER, Maastricht, The Netherland
- Hubrecht Institute for Developmental Biology and Stem Cell Research, Uppsalalaan 8, 3584, CT, Utrecht, The Netherlands
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Schell JY, Wilks BT, Patel M, Franck C, Chalivendra V, Cao X, Shenoy VB, Morgan JR. Harnessing cellular-derived forces in self-assembled microtissues to control the synthesis and alignment of ECM. Biomaterials 2016; 77:120-9. [DOI: 10.1016/j.biomaterials.2015.10.080] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 10/30/2015] [Indexed: 01/25/2023]
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Kraus D, Boyle V, Leibig N, Stark GB, Penna V. The Neuro-spheroid—A novel 3D in vitro model for peripheral nerve regeneration. J Neurosci Methods 2015; 246:97-105. [DOI: 10.1016/j.jneumeth.2015.03.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2014] [Revised: 01/27/2015] [Accepted: 03/03/2015] [Indexed: 12/17/2022]
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In vitro analysis of scaffold-free prevascularized microtissue spheroids containing human dental pulp cells and endothelial cells. J Endod 2015; 41:663-70. [PMID: 25687363 DOI: 10.1016/j.joen.2014.12.017] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Revised: 10/21/2014] [Accepted: 12/16/2014] [Indexed: 12/31/2022]
Abstract
INTRODUCTION Scaffolds often fail to mimic essential functions of the physiologic extracellular matrix (ECM) that regulates cell-cell communication in tissue microenvironments. The development of scaffold-free microtissues containing stem cell-derived ECM may serve as a successful alternative to the use of artificial scaffolds. The current study aimed to fabricate 3-dimensional microtissue spheroids of dental pulp cells (DPCs) prevascularized by human umbilical vein endothelial cells (HUVECs) and to characterize these scaffold-free spheroids for the in vitro formation of pulplike tissue constructs. METHODS Three-dimensional microtissue spheroids of DPC alone and DPC-HUVEC co-cultures were fabricated using agarose micro-molds. Cellular organization within the spheroids and cell viability (live/dead assay) were assessed at days 1, 7, and 14. Microtissue spheroids were allowed to self-assemble into macrotissues, induced for odontogenic differentiation (21 days), and examined for expression levels of osteo/odontogenic markers: alkaline phosphatase, bone sialoprotein and RUNX2 (Real-time PCR), mineralization (von-Kossa), and prevascularisation (immunohistochemistry for CD31). RESULTS The DPC microtissue microenvironment supported HUVEC survival and capillary network formation in the absence of a scaffolding material and external angiogenic stimulation. Immunohistochemical staining for CD31 showed the capillary network formed by HUVECs did sustain-for a prolonged period-even after the microtissues transformed into a macrotissue. Induced, prevascularized macrotissues showed enhanced differentiation capacity compared with DPC alone macrotissues, as shown by higher osteo/odontogenic gene expression levels and mineralization. CONCLUSIONS These findings provide insight into the complex intercellular cross talk occurring between DPCs and HUVECs in the context of angiogenesis and pulp regeneration and highlight the significance of developing a favorable 3-dimensional microenvironment that can, in turn, contribute toward successful pulp regeneration strategies.
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Dissanayaka WL, Zhu L, Hargreaves KM, Jin L, Zhang C. Scaffold-free Prevascularized Microtissue Spheroids for Pulp Regeneration. J Dent Res 2014; 93:1296-303. [PMID: 25201919 DOI: 10.1177/0022034514550040] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Creating an optimal microenvironment that mimics the extracellular matrix (ECM) of natural pulp and securing an adequate blood supply for the survival of cell transplants are major hurdles that need to be overcome in dental pulp regeneration. However, many currently available scaffolds fail to mimic essential functions of natural ECM. The present study investigated a novel approach involving the use of scaffold-free microtissue spheroids of dental pulp stem cells (DPSCs) prevascularized by human umbilical vein endothelial cells (HUVECs) in pulp regeneration. In vitro-fabricated microtissue spheroids were inserted into the canal space of tooth-root slices and were implanted subcutaneously into immunodeficient mice. Histological examination revealed that, after four-week implantation, tooth-root slices containing microtissue spheroids resulted in well-vascularized and cellular pulp-like tissues, compared with empty tooth-root slices, which were filled with only subcutaneous fat tissue. Immunohistochemical staining indicated that the tissue found in the tooth-root slices was of human origin, as characterized by the expression of human mitochondria, and contained odontoblast-like cells organized along the dentin, as assessed by immunostaining for nestin and dentin sialoprotein (DSP). Vascular structures formed by HUVECs in vitro were successfully anastomosed with the host vasculature upon transplantation in vivo, as shown by immunostaining for human CD31. Collectively, these findings demonstrate that prevascularized, scaffold-free, microtissue spheroids can successfully regenerate vascular dental pulp-like tissue and also highlight the significance of the microtissue microenvironment as an optimal environment for successful pulp-regeneration strategies.
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Affiliation(s)
- W L Dissanayaka
- Endodontics, Comprehensive Dental Care, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China
| | - L Zhu
- Endodontics, Comprehensive Dental Care, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China
| | - K M Hargreaves
- Department of Endodontics, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - L Jin
- Periodontology and Public Health, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China
| | - C Zhang
- Endodontics, Comprehensive Dental Care, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China
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Hartwell R, Lai A, Ghahary A. Modulation of extracellular matrix through keratinocyte–fibroblast crosstalk. ACTA ACUST UNITED AC 2014. [DOI: 10.1586/edm.09.55] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Svoronos AA, Tejavibulya N, Schell JY, Shenoy VB, Morgan JR. Micro-mold design controls the 3D morphological evolution of self-assembling multicellular microtissues. Tissue Eng Part A 2013; 20:1134-44. [PMID: 24147855 DOI: 10.1089/ten.tea.2013.0297] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
When seeded into nonadhesive micro-molds, cells self-assemble three-dimensional (3D) multicellular microtissues via the action of cytoskeletal-mediated contraction and cell-cell adhesion. The size and shape of the tissue is a function of the cell type and the size, shape, and obstacles of the micro-mold. In this article, we used human fibroblasts to investigate some of the elements of mold design and how they can be used to guide the morphological changes that occur as a 3D tissue self-organizes. In a loop-ended dogbone mold with two nonadhesive posts, fibroblasts formed a self-constrained tissue whose tension induced morphological changes that ultimately caused the tissue to thin and rupture. Increasing the width of the dogbone's connecting rod increased the stability, whereas increasing its length decreased the stability. Mapping the rupture points showed that the balance of cell volume between the toroid and connecting rod regions of the dogbone tissue controlled the point of rupture. When cells were treated with transforming growth factor-β1, dogbones ruptured sooner due to increased cell contraction. In mold designs to form tissues with more complex shapes such as three interconnected toroids or a honeycomb, obstacle design controlled tension and tissue morphology. When the vertical posts were changed to cones, they became tension modulators that dictated when and where tension was released in a large self-organizing tissue. By understanding how elements of mold design control morphology, we can produce better models to study organogenesis, examine 3D cell mechanics, and fabricate building parts for tissue engineering.
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Affiliation(s)
- Alexander A Svoronos
- 1 Department of Molecular Pharmacology, Physiology and Biotechnology, Brown University , Providence, Rhode Island
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12
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Formation of Multicellular Microtissues and Applications in Biofabrication. Biofabrication 2013. [DOI: 10.1016/b978-1-4557-2852-7.00008-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Tejavibulya N, Youssef J, Bao B, Ferruccio TM, Morgan JR. Directed self-assembly of large scaffold-free multi-cellular honeycomb structures. Biofabrication 2011; 3:034110. [PMID: 21828905 DOI: 10.1088/1758-5082/3/3/034110] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A significant challenge to the field of biofabrication is the rapid construction of large three-dimensional (3D) living tissues and organs. Multi-cellular spheroids have been used as building blocks. In this paper, we create large multi-cellular honeycomb building blocks using directed self-assembly, whereby cell-to-cell adhesion, in the context of the shape and obstacles of a micro-mold, drives the formation of a 3D structure. Computer-aided design, rapid prototyping and replica molding were used to fabricate honeycomb-shaped micro-molds. Nonadhesive hydrogels cast from these micro-molds were equilibrated in the cell culture medium and seeded with two types of mammalian cells. The cells settled into the honeycomb recess were unable to attach to the nonadhesive hydrogel and so cell-to-cell adhesion drove the self-assembly of a large multi-cellular honeycomb within 24 h. Distinct morphological changes occurred to the honeycomb and its cells indicating the presence of significant cell-mediated tension. Unlike the spheroid, whose size is constrained by a critical diffusion distance needed to maintain cell viability, the overall size of the honeycomb is not limited. The rapid production of the honeycomb building unit, with its multiple rings of high-density cells and open lumen spaces, offers interesting new possibilities for biofabrication strategies.
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Affiliation(s)
- Nalin Tejavibulya
- Department of Molecular Pharmacology, Physiology and Biotechnology, Center for Biomedical Engineering, Brown University, G-B 393, Biomed Center, 171 Meeting St, Providence, RI 02912, USA
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Choudhury D, Mo X, Iliescu C, Tan LL, Tong WH, Yu H. Exploitation of physical and chemical constraints for three-dimensional microtissue construction in microfluidics. BIOMICROFLUIDICS 2011; 5:22203. [PMID: 21799710 PMCID: PMC3145229 DOI: 10.1063/1.3593407] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2011] [Accepted: 05/02/2011] [Indexed: 05/06/2023]
Abstract
There are a plethora of approaches to construct microtissues as building blocks for the repair and regeneration of larger and complex tissues. Here we focus on various physical and chemical trapping methods for engineering three-dimensional microtissue constructs in microfluidic systems that recapitulate the in vivo tissue microstructures and functions. Advances in these in vitro tissue models have enabled various applications, including drug screening, disease or injury models, and cell-based biosensors. The future would see strides toward the mesoscale control of even finer tissue microstructures and the scaling of various designs for high throughput applications. These tools and knowledge will establish the foundation for precision engineering of complex tissues of the internal organs for biomedical applications.
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Kinney MA, Sargent CY, McDevitt TC. The multiparametric effects of hydrodynamic environments on stem cell culture. TISSUE ENGINEERING PART B-REVIEWS 2011; 17:249-62. [PMID: 21491967 DOI: 10.1089/ten.teb.2011.0040] [Citation(s) in RCA: 108] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Stem cells possess the unique capacity to differentiate into many clinically relevant somatic cell types, making them a promising cell source for tissue engineering applications and regenerative medicine therapies. However, in order for the therapeutic promise of stem cells to be fully realized, scalable approaches to efficiently direct differentiation must be developed. Traditionally, suspension culture systems are employed for the scale-up manufacturing of biologics via bioprocessing systems that heavily rely upon various types of bioreactors. However, in contrast to conventional bench-scale static cultures, large-scale suspension cultures impart complex hydrodynamic forces on cells and aggregates due to fluid mixing conditions. Stem cells are exquisitely sensitive to environmental perturbations, thus motivating the need for a more systematic understanding of the effects of hydrodynamic environments on stem cell expansion and differentiation. This article discusses the interdependent relationships between stem cell aggregation, metabolism, and phenotype in the context of hydrodynamic culture environments. Ultimately, an improved understanding of the multifactorial response of stem cells to mixed culture conditions will enable the design of bioreactors and bioprocessing systems for scalable directed differentiation approaches.
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Affiliation(s)
- Melissa A Kinney
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0532, USA
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Raof NA, Padgen MR, Gracias AR, Bergkvist M, Xie Y. One-dimensional self-assembly of mouse embryonic stem cells using an array of hydrogel microstrands. Biomaterials 2011; 32:4498-505. [PMID: 21459438 DOI: 10.1016/j.biomaterials.2011.03.011] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2011] [Accepted: 03/07/2011] [Indexed: 02/07/2023]
Abstract
The ability of embryonic stem (ES) cells to self-renew indefinitely and to differentiate into multiple cell lineages holds promise for advances in modeling disease progression, screening drugs and treating diseases. To realize these potentials, it is imperative to study self-assembly in an embryonic microenvironment, as this may increase our understanding of ES cell maintenance and differentiation. In this study, we synthesized an array of one-dimensional alginate gel microstrands and aqueous microstrands through an SU-8 filter device by means of capillary action. Furthermore, we investigated self-assembly behaviors and differentiation potentials of mouse ES cells cultured in microstrands of varying diameters. We found that microstrands with an aqueous interior facilitated high density cell culture and formed compact microtissue structures, while microstrands with gelled interiors promote smaller cell aggregate structures. In particular, we noticed that ES cells collected from one-dimensional aqueous microstrands favored the differentiation towards cell lineages of endoderm and mesoderm, whereas those from gelled microstrands preferred to differentiate into ectoderm and mesoderm lineages. In addition to providing a "liquid-like" tubular microenvironment to understand one-dimensional self-assembly process of ES cells, this alginate hydrogel microstrand system also offers an alternative way to manipulate the stem cell fate-decision using bioengineered microenvironments.
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Affiliation(s)
- Nurazhani Abdul Raof
- College of Nanoscale Science and Engineering, University at Albany, State University of New York (SUNY), Albany, NY 12203, USA
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Schwarz MA, Zheng H, Legan S, Foty RA. Lung self-assembly is modulated by tissue surface tensions. Am J Respir Cell Mol Biol 2010; 44:682-91. [PMID: 20616358 DOI: 10.1165/rcmb.2009-0309oc] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
To identify cell-intrinsic properties that facilitate interaction between epithelial endodermal and mesenchymal mesodermal cells during lung morphogenesis, we developed a model of lung self-assembly that mimics fetal lung formation in structure, polarity, vasculature, and extracellular matrix expression. Three-dimensional pulmonary bodies (PBs) spontaneously self-assemble from single-cell suspensions and exhibit liquid-like properties that allow measurements of compaction rate and cohesion, and that may help to specify cellular self-organization. We hypothesized that changes in one or more of these parameters could potentially explain the lung hypoplasia associated with abnormal lung development. We examined the impact of endothelial/monocyte-activating polypeptide (EMAP) II in PBs, because EMAPII is highly expressed in lung hypoplasia. EMAPII significantly increased compaction rate and decreased overall cohesion of PBs composed of both epithelial and mesenchymal cells. Moreover, the effects of EMAPII on compaction and cohesion act exclusively through the mesenchymal cell population by interfering with fibronectin matrix assembly. We also show that EMAPII alters epithelial cell polarity and surfactant protein C expression. Our findings demonstrate, for the first time, that PBs possess liquid-like properties that can help to guide the self-assembly of fetal lungs, and that EMAPII expression can influence both mesenchymal and epithelial cells but through different molecular mechanisms.
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18
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Khan S, Newaz G. A comprehensive review of surface modification for neural cell adhesion and patterning. J Biomed Mater Res A 2010; 93:1209-24. [DOI: 10.1002/jbm.a.32698] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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19
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Dean DM, Morgan JR. Cytoskeletal-mediated tension modulates the directed self-assembly of microtissues. Tissue Eng Part A 2009; 14:1989-97. [PMID: 18673088 DOI: 10.1089/ten.tea.2007.0320] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The ability of cells to self-assemble into a microtissue such as a spheroid has been attributed mainly to intercellular cohesiveness achieved by the binding of surface membrane proteins such as cadherins. However, highly dynamic and complex cytoskeletal rearrangements are coordinated with these binding events and therefore are likely to participate in self-assembly. By inhibiting such cytoskeletal activity, Y-27632 has been used to prevent and treat fibrotic disease. Here, we used the Rho kinase inhibitor to investigate the role that cellular contraction plays in self-assembly. Normal human fibroblasts (NHFs), Reuber-H35 hepatoma cells (H35s), and mixes of the two (hybrid) were treated with drug during directed self-assembly of microtissues in nonadhesive, micromolded hydrogels. The kinetics of self-assembly of both constrained and unconstrained NHF microtissues were dramatically slowed by the drug, and inhibition was dose responsive and reversible. Although sorting of NHFs and H35s occurred normally in the presence of drug, Y-27632-treated NHFs sorted to the outside of a spheroid when mixed with untreated NHFs. When mixed with H35s in trough micromolds, NHFs could drive spheroid formation from the core of the hybrid microtissues even in small numbers relative to H35s (1:19). These findings demonstrate that cellular contraction controls the kinetics of self-assembly and suggests that NHFs within the core of a microtissue can transmit contractile forces through heterotypic bonds with H35s. The control of directed self-assembly using fibroblasts and contraction inhibitors may be useful for in vitro tissue engineering as well as represent an in vitro model for fibrotic disease.
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Affiliation(s)
- Dylan M Dean
- Department of Molecular Pharmacology, Physiology, and Biotechnology, Center for Biomedical Engineering, Brown University, Providence, Rhode Island 02912, USA
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20
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Peretz H, Blinder P, Baranes D, Vago R. Aragonite crystalline matrix as an instructive microenvironment for neural development. J Tissue Eng Regen Med 2008; 2:463-71. [DOI: 10.1002/term.118] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Serruya MD, Kahana MJ. Techniques and devices to restore cognition. Behav Brain Res 2008; 192:149-65. [PMID: 18539345 DOI: 10.1016/j.bbr.2008.04.007] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2007] [Revised: 03/03/2008] [Accepted: 04/09/2008] [Indexed: 12/18/2022]
Abstract
Executive planning, the ability to direct and sustain attention, language and several types of memory may be compromised by conditions such as stroke, traumatic brain injury, cancer, autism, cerebral palsy and Alzheimer's disease. No medical devices are currently available to help restore these cognitive functions. Recent findings about the neurophysiology of these conditions in humans coupled with progress in engineering devices to treat refractory neurological conditions imply that the time has arrived to consider the design and evaluation of a new class of devices. Like their neuromotor counterparts, neurocognitive prostheses might sense or modulate neural function in a non-invasive manner or by means of implanted electrodes. In order to paint a vision for future device development, it is essential to first review what can be achieved using behavioral and external modulatory techniques. While non-invasive approaches might strengthen a patient's remaining intact cognitive abilities, neurocognitive prosthetics comprised of direct brain-computer interfaces could in theory physically reconstitute and augment the substrate of cognition itself.
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Affiliation(s)
- Mijail Demian Serruya
- Department of Neurology, Hospital of the University of Pennsylvania, 3400 Spruce Street, Gates 3 HUP, Philadelphia, PA 19104-4283, United States.
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Kelm JM, Moritz W, Schmidt D, Hoerstrup SP, Fussenegger M. In vitro vascularization of human connective microtissues. METHODS IN MOLECULAR MEDICINE 2008; 140:153-66. [PMID: 18085208 DOI: 10.1007/978-1-59745-443-8_9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Vascularization is one of the most central processes enabling multicellular life. Owing to the complexity of vascularization regulatory networks, minor control imbalances often have severe pathologic consequences ranging from ischemic diseases to cancer. Tissue engineers are immediately confronted with vascularization as artificial tissues of a clinically relevant size require a vascular system to ensure vital physiologic logistics throughout the entire tissue and to enable rapid connection to the host vasculature following implantation. Using human umbilical vein endothelial cells (HUVECs) coated onto a human aortic fibroblast (HAF) core microtissue generated by gravity-enforced self-assembly in hanging drops, we created a tissue-culture system for studying capillary network formation. We provide comprehensive technical insight into the design and analysis of prototype vascularization in multicell-type-based microtissues. Detailed understanding of generic processes managing capillary formation in human tissue culture may foster advances in the development of clinical tissue implants.
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Affiliation(s)
- Jens M Kelm
- Institute for Chemical and Bio-Engineering, ETH Zurich, Switzerland
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23
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Päiväläinen S, Nissinen M, Honkanen H, Lahti O, Kangas SM, Peltonen J, Peltonen S, Heape AM. Myelination in mouse dorsal root ganglion/Schwann cell cocultures. Mol Cell Neurosci 2007; 37:568-78. [PMID: 18206387 DOI: 10.1016/j.mcn.2007.12.005] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2007] [Revised: 11/26/2007] [Accepted: 12/06/2007] [Indexed: 10/22/2022] Open
Abstract
The established protocols for in vitro studies of peripheral nerve myelination with rat embryonic dorsal root ganglia (DRG) and postnatal Schwann cell cocultures do not work with mouse cells. Consequently, the full potential of this model, which would allow to perform cell type-specific, mixed genotype cocultures without cross-breeding the animals, cannot be exploited. We determined the conditions required to promote full myelination in cocultures of pre-purified mouse embryonic DRG and neonatal Schwann cells, and present a method which consistently yields 50-200 mature myelin sheaths/culture. Causes for the failure of the existing protocols to yield satisfactory results with mouse cells fell into three categories: the lack of adherent support provided by the substratum, growth factor and hormone deficiencies, and the high serum content of the media. For optimal results, mouse cocultures require a 3-dimensional substratum, a myelination-promoting culture medium containing pituitary extract, N2 supplement and forskolin, and a low serum concentration.
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Affiliation(s)
- Satu Päiväläinen
- Department of Anatomy and Cell Biology, University of Oulu, Aapistie 7A, 90014 Oulu, Finland
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Napolitano AP, Chai P, Dean DM, Morgan JR. Dynamics of the Self-Assembly of Complex Cellular Aggregates on Micromolded Nonadhesive Hydrogels. ACTA ACUST UNITED AC 2007; 13:2087-94. [PMID: 17518713 DOI: 10.1089/ten.2006.0190] [Citation(s) in RCA: 162] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The process by which cells self-assemble to form three-dimensional (3D) structures is central to morphogenesis and development of living tissues and hence is of growing interest to the field of tissue engineering. Using rapid prototyping technology we made micromolded nonadhesive hydrogels to study the dynamics of self-assembly in a low-shear environment with simple spherical geometries as well as more complex geometries such as a toroid. Aggregate size, shape, and composition were easily controlled; aggregates were easily retrieved; and the dynamics of the assembly process were readily observed by time-lapse microscopy. When two cell types, normal human fibroblasts (NHFs) and human umbilical vein endothelial cells (HUVECs), were seeded together, they self-segregated into multilayered spherical microtissues with a core of NHFs enveloped by a layer of HUVECs. Surprisingly, when a single cell suspension of NHFs was added to 7-day-old HUVEC spheroids, the HUVEC spheroid reorganized such that NHFs occupied the center and HUVECs coated the outside, demonstrating that self-assembly is not terminal and that spheroids are fluid structures that retain the ability to reassemble. We also showed that cells can self-assemble to form a complex toroid shape, and we observed several phenomena indicating that cellular contraction and tension play a significant role in the assembly process of complex shapes.
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Affiliation(s)
- Anthony P Napolitano
- Department of Molecular Pharmacology, Physiology, and Biotechnology, Center for Biomedical Engineering, Brown University, Providence, Rhode Island, USA
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Dean DM, Napolitano AP, Youssef J, Morgan JR. Rods, tori, and honeycombs: the directed self-assembly of microtissues with prescribed microscale geometries. FASEB J 2007; 21:4005-12. [PMID: 17627028 DOI: 10.1096/fj.07-8710com] [Citation(s) in RCA: 136] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
It is thought that, due to energy and surface area:volume minimization, the spheroid is the terminal structure of cellular self-assembly. We investigated whether self-assembly could be directed to generate complex-shaped structures. Using micromolded, nonadhesive agarose hydrogels seeded with rat hepatoma (H35s), human fibroblasts (NHFs), or their mix (1:1), we show that cells can self-assemble rods, tori, and honeycombs. We found that in trough-shaped recesses up to 2.2 mm long, H35s readily formed rod-like structures stable at 49% the recess lengths. They also formed intact tori (88%) and fully intact honeycombs structures with patent lumens (9/9) even when released from the mold. In contrast, NHFs in trough features progressed rapidly to spheroids and formed fewer stable tori (30%) and honeycombs (0/9). The 1:1 mix of cells self-assembled rapidly like NHFs but were able to form more stable structures (tori: 30%, honeycombs: 3/9). Experiments with labeled cells in tori and honeycombs revealed that cells self-segregated in these complex structures, with H35s enveloping NHFs, and that NHFs had different morphologies in taut vs. relaxed structures. These data open new possibilities for in vitro tissue models for embryo- and organogenesis study as well as for tissue engineering applications.
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Affiliation(s)
- Dylan M Dean
- Department of Molecular Pharmacology, Physiology and Biotechnology, Center for Biomedical Engineering, Brown University, Providence, Rhode Island 02912, USA
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26
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Steinberg MS. Differential adhesion in morphogenesis: a modern view. Curr Opin Genet Dev 2007; 17:281-6. [PMID: 17624758 DOI: 10.1016/j.gde.2007.05.002] [Citation(s) in RCA: 280] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2007] [Revised: 05/01/2007] [Accepted: 05/02/2007] [Indexed: 12/27/2022]
Abstract
The spreading of one embryonic tissue over another, the sorting out of their cells when intermixed and the formation of intertissue boundaries respected by the motile border cells all have counterparts in the behavior of immiscible liquids. The 'differential adhesion hypothesis' (DAH) explains these liquid-like tissue behaviors as consequences of the generation of tissue surface and interfacial tensions arising from the adhesion energies between motile cells. The experimental verification of the DAH, the recent computational models simulating adhesion-mediated morphogenesis, and the evidence concerning the role of differential adhesion in a number of morphodynamic events, including teleost epiboly, the specification of boundaries between rhombomeres in the developing vertebrate hindbrain, epithelial-mesenchymal transitions in embryos, and malignant invasion are reviewed here.
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Affiliation(s)
- Malcolm S Steinberg
- Department of Molecular Biology, Princeton University, Princeton, NJ 08544, United States.
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27
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Kelm JM, Djonov V, Ittner LM, Fluri D, Born W, Hoerstrup SP, Fussenegger M. Design of custom-shaped vascularized tissues using microtissue spheroids as minimal building units. ACTA ACUST UNITED AC 2006; 12:2151-60. [PMID: 16968156 DOI: 10.1089/ten.2006.12.2151] [Citation(s) in RCA: 128] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Tissue engineering strategies are gathering clinical momentum in regenerative medicine and are expected to provide excellent opportunities for therapy for difficult-to-treat human pathologies. Being aware of the requirement to produce larger artificial tissue implants for clinical applications, we used microtissues, produced using gravity-enforced self-assembly of monodispersed primary cells, as minimal tissue units to generate scaffold-free vascularized artificial macrotissues in custom-shaped agarose molds. Mouse myoblast, pig and human articular-derived chondrocytes, and human myofibroblast (HMF)-composed microtissues (microm3 scale) were amalgamated to form coherent macrotissue patches (mm3 scale) of a desired shape. Macrotissues, assembled from the human umbilical vein endothelial cell (HUVEC)-coated HMF microtissues, developed a vascular system, which functionally connected to the chicken embryo's vasculature after implantation. The design of scaffold-free vascularized macrotissues is a first step toward the scale-up and production of artificial tissue implants for future tissue engineering initiatives.
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Affiliation(s)
- Jens M Kelm
- Institute for Chemical and Bio-Engineering, Swiss Federal Institute of Technology, Zurich, Switzerland
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28
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Palyvoda O, Chen CC, Auner GW. Culturing neuron cells on electrode with self-assembly monolayer. Biosens Bioelectron 2006; 22:2346-50. [PMID: 17008089 DOI: 10.1016/j.bios.2006.08.021] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2006] [Revised: 08/05/2006] [Accepted: 08/09/2006] [Indexed: 10/24/2022]
Abstract
The success of neuronal implantable microsystems relies on the quality of the interface with neuronal cells. Depending on the application, specifically engineered surfaces may either prevent or enhance cell/tissue growth with an appropriate host response. The surface chemistry and topography have major effects on the cell adherence and the interaction between the tissue and devices. We report on a simple technique to precisely explant cortical neurons in a serum-free medium on 2D electrode arrays and investigated the pad size effect on neuron cell culture and immobilization. We produced gold patterns on glass substrates using microfabrication processes. 11-Amino-1-undecanethiol self-assembled monolayer was coated only on the gold surface. Cortical neurons were cultured on the arrays to examine the dependence of neuron growth and cells distribution on pad size. We found that the terminal functional groups of the highly oriented 11-amino-1-undecanethiol thin film are essential for generating cell-adhesive areas for the rat cortical neurons. A 50 microm x 50 microm SAM pad size was found to be suitable for single cortical neuron immobilization, while the larger pads provide excellent neuron coverage. This technology may enable precise and localized neuron stimulation and surveillance for both biological research and medical applications.
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Affiliation(s)
- Olena Palyvoda
- Smart Sensors and Integrated Microsystems (SSIM), Department Electrical and Computer Engineering, Wayne State University, Detroit, USA.
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Gonzalez-Nicolini V, Sanchez-Bustamante CD, Hartenbach S, Fussenegger M. Adenoviral vector platform for transduction of constitutive and regulated tricistronic or triple-transcript transgene expression in mammalian cells and microtissues. J Gene Med 2006; 8:1208-22. [PMID: 16960915 DOI: 10.1002/jgm.960] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Adenoviral particles can efficiently transduce a broad spectrum of cell types, so they are widely used in basic research and clinical trials. METHODS We have developed a novel adenoviral vector platform for delivery of constitutive or streptogramin-inducible expression of up to three therapeutic transgenes into a variety of murine and human cell lines, primary cells and microtissues. RESULTS Coordinated expression of three independent transgenes in a compact genetic format was achieved by two different expression configurations: (i) The multicistronic expression format consisting of a single constitutive (simian virus 40 promoter, P(SV40); murine or human cytomegalovirus immediate-early promoter, P(mCMV), P(hCMV)) or regulated (streptogramin-inducible) promoters (P(PIR)ON2) driving the expression of a single multicistronic transcript of which the first cistron is translated in a cap-dependent manner and the two subsequent ones by internal ribosome entry site (IRES)-mediated translation initiation. (ii) The triple-transcript expression configuration, in which a combination of well-established (P(SV40), P(hCMV), P(mCMV)) and novel synthetic constitutive promoters (P(GTX)) control transcription of three expression units. The constitutive multigene expression design enabled coordinated high-level expression of the Bacillus stearothermophilus-derived secreted alpha-amylase (SAMY), the human vascular endothelial growth factor 121 (VEGF(121)) and the human placental secreted alkaline phosphatase (SEAP) in monolayer populations and microtissues of Chinese hamster ovary cells (CHO-K1), human fibrosarcoma cells (HT-1080), primary neonatal rat cardiomyocytes (NRCs) and primary human aortic fibroblasts (HAFs). Streptogramin-inducible tricistronic SAMY-VEGF(121)-SEAP expression provided excellent regulation performance-high-level induction in the presence of the streptogramin antibiotic pristinamycin I (PI), near-undetectable basal expression in the absence of PI, optimal adjustability and perfect reversibility-in all cell types, in particular in NRCs and NRC-derived myocardial microtissues. CONCLUSIONS Triple-transcript and tricistronic expression configurations conserve the DNA packaging capacity of the size-constrained viral transduction systems and enable coordinated and regulated expression of up to three therapeutic transgenes for concerted clinical interventions in future gene therapy scenarios.
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Affiliation(s)
- Valeria Gonzalez-Nicolini
- Institute for Chemical and Bio-Engineering, Swiss Federal Institute of Technology-ETH Zurich, ETH Hoenggerberg, HCI F115, Wolfgang-Pauli-Strasse 10, CH-8093 Zurich, Switzerland
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