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Besser RR, Bowles AC, Alassaf A, Carbonero D, Maciel R, Saporta M, Agarwal A. A Chemically Defined Common Medium for Culture of C2C12 Skeletal Muscle and Human Induced Pluripotent Stem Cell Derived Spinal Spheroids. Cell Mol Bioeng 2020; 13:605-619. [PMID: 33281990 PMCID: PMC7704992 DOI: 10.1007/s12195-020-00624-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 06/03/2020] [Indexed: 01/14/2023] Open
Abstract
INTRODUCTION Multicellular platforms and linked multi organ on chip devices are powerful tools for drug discovery, and basic mechanistic studies. Often, a critical constraint is defining a culture medium optimal for all cells present in the system. In this study, we focused on the key cells of the neuromuscular junction i.e., skeletal muscle and motor neurons. METHODS Formulation of a chemically defined medium for the co-culture of C2C12 skeletal muscle cells and human induced pluripotent stem cell (hiPSC) derived spinal spheroids (SpS) was optimized. C2C12 cells in 10 experimental media conditions and 2 topographies were evaluated over a 14-day maturation period to determine the ideal medium formulation for skeletal muscle tissue development. RESULTS During early maturation, overexpression of genes for myogenesis and myopathy was observed for several media conditions, corresponding to muscle delamination and death. Together, we identified 3 media formulations that allowed for more controlled differentiation, healthier muscle tissue, and long-term culture duration. This evidence was then used to select media formulations to culture SpS and subsequently assessed axonal growth. As axonal growth in SpS cultures was comparable in all selected media conditions, our data suggest that the neuronal basal medium with no added supplements is the ideal medium formulation for both cell types. CONCLUSIONS Optimization using both topographical cues and culture media formulations provides a comprehensive analyses of culture conditions that are vital to future applications for in vitro NMJ models.
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Affiliation(s)
- Rachel R. Besser
- Department of Biomedical Engineering, DJTMF Biomedical Nanotechnology Institute, University of Miami, 1251 Memorial Dr, MEA 203, Coral Gables, FL 33146 USA
| | - Annie C. Bowles
- Department of Biomedical Engineering, DJTMF Biomedical Nanotechnology Institute, University of Miami, 1251 Memorial Dr, MEA 203, Coral Gables, FL 33146 USA
| | - Ahmad Alassaf
- Department of Biomedical Engineering, DJTMF Biomedical Nanotechnology Institute, University of Miami, 1251 Memorial Dr, MEA 203, Coral Gables, FL 33146 USA
- Department of Medical Equipment Technology, College of Applied Medical Sciences, Majmaah University, Al-Majmaah, 11952 Saudi Arabia
| | - Daniel Carbonero
- Department of Biomedical Engineering, DJTMF Biomedical Nanotechnology Institute, University of Miami, 1251 Memorial Dr, MEA 203, Coral Gables, FL 33146 USA
| | - Renata Maciel
- Department of Neurology, University of Miami Miller School of Medicine, 1120 NW 14th St, Suite 1310, Miami, FL 33136 USA
| | - Mario Saporta
- Department of Neurology, University of Miami Miller School of Medicine, 1120 NW 14th St, Suite 1310, Miami, FL 33136 USA
| | - Ashutosh Agarwal
- Department of Biomedical Engineering, DJTMF Biomedical Nanotechnology Institute, University of Miami, 1251 Memorial Dr, MEA 203, Coral Gables, FL 33146 USA
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52
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Qu Z, Liu C, Li P, Xiong W, Zeng Z, Liu A, Xiao W, Huang J, Liu Z, Zhang S. Theaflavin Promotes Myogenic Differentiation by Regulating the Cell Cycle and Surface Mechanical Properties of C2C12 Cells. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:9978-9992. [PMID: 32830510 DOI: 10.1021/acs.jafc.0c03744] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Aging and muscle diseases often lead to a decline in the differentiation capacity of myoblasts, which in turn results in the deterioration of skeletal muscle (SkM) function and impairment of regeneration ability after injury. Theaflavins, the "gold molecules" found in black tea, have been reported to possess various biological activities and have a positive effect on maintaining human health. In this study, we found that among the four theaflavins (theaflavin (TF1), theaflavin-3-gallate (TF2A), theaflavin-3'-gallate (TF2B), and theaflavin-3,3'-digallate (TF3) monomers), TF1 (20 μM) significantly promoted the fusion index of myoblasts, number of mature myotubes, and degree of myotube development. By combining transcriptomics, bioinformatics, and molecular biology experiments, we showed that TF1 may promote myoblast differentiation by (1) regulating the withdrawal of myoblasts from the cell cycle, inducing the release of myogenic factors (MyoD, MyoG, and MyHC) and accelerating myogenic differentiation and (2) regulating the adhesion force of myoblasts and mechanical properties of mature myotubes and promoting the migration, fusion, and development of myoblasts. In conclusion, our study outcomes show that TF1 can promote myoblast differentiation and regulate myotube mechanical properties. It is a potential dietary supplement for the elderly. Our findings provide a new scientific basis for the relationship between tea drinking and aging.
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Affiliation(s)
- Zhihao Qu
- Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan 410128, China
- National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, Collaborative Innovation Centre of Utilization of Functional Ingredients from Botanicals, Hunan Agricultural University, Changsha, Hunan 410128, China
| | - Changwei Liu
- Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan 410128, China
- National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, Collaborative Innovation Centre of Utilization of Functional Ingredients from Botanicals, Hunan Agricultural University, Changsha, Hunan 410128, China
| | - Penghui Li
- School of Life Sciences, Fudan University, Shanghai 200433, China
| | - Wei Xiong
- The Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education, Cancer Research Institute, Central South University, Changsha, Hunan 410008, China
| | - Zhaoyang Zeng
- The Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education, Cancer Research Institute, Central South University, Changsha, Hunan 410008, China
| | - Ailing Liu
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan 410128, China
| | - Wenjun Xiao
- Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan 410128, China
- National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, Collaborative Innovation Centre of Utilization of Functional Ingredients from Botanicals, Hunan Agricultural University, Changsha, Hunan 410128, China
| | - Jianan Huang
- Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan 410128, China
- National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, Collaborative Innovation Centre of Utilization of Functional Ingredients from Botanicals, Hunan Agricultural University, Changsha, Hunan 410128, China
| | - Zhonghua Liu
- Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan 410128, China
- National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, Collaborative Innovation Centre of Utilization of Functional Ingredients from Botanicals, Hunan Agricultural University, Changsha, Hunan 410128, China
| | - Sheng Zhang
- Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan 410128, China
- National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, Collaborative Innovation Centre of Utilization of Functional Ingredients from Botanicals, Hunan Agricultural University, Changsha, Hunan 410128, China
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53
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Tan JJY, Lee CP, Hashimoto M. Preheating of Gelatin Improves its Printability with Transglutaminase in Direct Ink Writing 3D Printing. Int J Bioprint 2020; 6:296. [PMID: 33088999 PMCID: PMC7557522 DOI: 10.18063/ijb.v6i4.296] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 06/07/2020] [Indexed: 02/06/2023] Open
Abstract
Gelatin and transglutaminase (TG) ink is increasingly popular in direct ink writing three-dimensional (3D) printing of cellular scaffolds and edible materials. The use of enzymes to crosslink gelatin chains removes the needs for toxic crosslinkers and bypasses undesired side reactions due to the specificity of the enzymes. However, their application in 3D printing remains challenging primarily due to the rapid crosslinking that leads to the short duration of printable time. In this work, we propose the use of gelatin preheated for 7 days to extend the duration of the printing time of the gelatin ink. We first determined the stiffness of freshly prepared gelatin (FG) and preheated gelatin (PG) (5 – 20% w/w) containing 5% w/w TG. We selected gelatin hydrogels made from 7.5% w/w FG and 10% w/w PG that yielded similar stiffness for subsequent studies to determine the duration of the printable time. PG inks exhibited longer time required for gelation and a smaller increase in viscosity with time than FG inks of similar stiffness. Our study suggested the advantage to preheat gelatin to enhance the printability of the ink, which is essential for extrusion-based bioprinting and food printing.
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Affiliation(s)
- Justin Jia Yao Tan
- Pillar of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372, Singapore.,SUTD-MIT International Design Centre, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372, Singapore
| | - Cheng Pau Lee
- Pillar of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372, Singapore.,SUTD-MIT International Design Centre, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372, Singapore
| | - Michinao Hashimoto
- Pillar of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372, Singapore.,SUTD-MIT International Design Centre, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372, Singapore
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Almonacid Suarez AM, Brinker MGL, Brouwer LA, van der Ham I, Harmsen MC, van Rijn P. Topography-Mediated Myotube and Endothelial Alignment, Differentiation, and Extracellular Matrix Organization for Skeletal Muscle Engineering. Polymers (Basel) 2020; 12:polym12091948. [PMID: 32872193 PMCID: PMC7564871 DOI: 10.3390/polym12091948] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 08/14/2020] [Accepted: 08/24/2020] [Indexed: 12/21/2022] Open
Abstract
Understanding the response of endothelial cells to aligned myotubes is important to create an appropriate environment for tissue-engineered vascularized skeletal muscle. Part of the native tissue environment is the extracellular matrix (ECM). The ECM is a supportive scaffold for cells and allows cellular processes such as proliferation, differentiation, and migration. Interstitial matrix and basal membrane both comprise proteinaceous and polysaccharide components for strength, architecture, and volume retention. Virtually all cells are anchored to their basal lamina. One of the physical factors that affects cell behavior is topography, which plays an important role on cell alignment. We tested the hypothesis that topography-driven aligned human myotubes promote and support vascular network formation as a prelude to in vitro engineered vascularized skeletal muscle. Therefore, we used a PDMS-based topography substrate to investigate the influence of pre-aligned myotubes on the network formation of microvascular endothelial cells. The aligned myotubes produced a network of collagen fibers and laminin. This network supported early stages of endothelial network formation.
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Affiliation(s)
- Ana Maria Almonacid Suarez
- Department of Pathology and Medical Biology, University Medical Center Groningen, Hanzeplein 1 (EA11), 9713 GZ Groningen, The Netherlands; (A.M.A.S.); (M.G.L.B.); (L.A.B.); (I.v.d.H.)
| | - Marja G. L. Brinker
- Department of Pathology and Medical Biology, University Medical Center Groningen, Hanzeplein 1 (EA11), 9713 GZ Groningen, The Netherlands; (A.M.A.S.); (M.G.L.B.); (L.A.B.); (I.v.d.H.)
| | - Linda A. Brouwer
- Department of Pathology and Medical Biology, University Medical Center Groningen, Hanzeplein 1 (EA11), 9713 GZ Groningen, The Netherlands; (A.M.A.S.); (M.G.L.B.); (L.A.B.); (I.v.d.H.)
| | - Iris van der Ham
- Department of Pathology and Medical Biology, University Medical Center Groningen, Hanzeplein 1 (EA11), 9713 GZ Groningen, The Netherlands; (A.M.A.S.); (M.G.L.B.); (L.A.B.); (I.v.d.H.)
| | - Martin C. Harmsen
- Department of Pathology and Medical Biology, University Medical Center Groningen, Hanzeplein 1 (EA11), 9713 GZ Groningen, The Netherlands; (A.M.A.S.); (M.G.L.B.); (L.A.B.); (I.v.d.H.)
- Correspondence: (M.C.H.); (P.v.R.); Tel.: +31-50361-4776 (M.C.H.); +31-50361-6066 (P.v.R.)
| | - Patrick van Rijn
- Department of Biomedical Engineering-FB40, W.J. Kolff Institute for Biomedical Engineering and Materials Science-FB41, University Medical Center Groningen, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands
- Correspondence: (M.C.H.); (P.v.R.); Tel.: +31-50361-4776 (M.C.H.); +31-50361-6066 (P.v.R.)
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55
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Jensen JH, Cakal SD, Li J, Pless CJ, Radeke C, Jepsen ML, Jensen TE, Dufva M, Lind JU. Large-scale spontaneous self-organization and maturation of skeletal muscle tissues on ultra-compliant gelatin hydrogel substrates. Sci Rep 2020; 10:13305. [PMID: 32764726 PMCID: PMC7411013 DOI: 10.1038/s41598-020-69936-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Accepted: 07/15/2020] [Indexed: 11/09/2022] Open
Abstract
Cellular self-organization is the fundamental driving force behind the complex architectures of native tissue. Yet, attempts at replicating native tissue architectures in vitro often involve complex micro-fabrication methods and materials. While impressive progress has been made within engineered models of striated muscle, the wide adaptation of these models is held back by the need for specific tools and knowhow. In this report, we show that C2C12 myoblasts spontaneously organize into highly aligned myotube tissues on the mm to cm scale, when cultured on sufficiently soft yet fully isotropic gelatin hydrogel substrates. Interestingly, we only observed this phenomenon for hydrogels with Young’s modulus of 6 kPa and below. For slightly more rigid compositions, only local micrometer-scale myotube organization was observed, similar to that seen in conventional polystyrene dishes. The hydrogel-supported myotubes could be cultured for multiple weeks and matured into highly contractile phenotypes with notable upregulation of myosin heavy chain, as compared to myotubes developed in conventional petri dishes. The procedure for casting the ultra-soft gelatin hydrogels is straight forward and compatible with standardized laboratory tools. It may thus serve as a simple, yet versatile, approach to generating skeletal muscle tissue of improved physiological relevance for applied and basic research.
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Affiliation(s)
- Joen H Jensen
- Department of Health Technology, Technical University of Denmark, Building 423, 2800, Kgs. Lyngby, Denmark
| | - Selgin D Cakal
- Department of Health Technology, Technical University of Denmark, Building 423, 2800, Kgs. Lyngby, Denmark
| | - Jingwen Li
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, University of Copenhagen, 2100, København Ø, Denmark
| | - Christian J Pless
- Department of Health Technology, Technical University of Denmark, Building 423, 2800, Kgs. Lyngby, Denmark
| | - Carmen Radeke
- Department of Health Technology, Technical University of Denmark, Building 423, 2800, Kgs. Lyngby, Denmark
| | - Morten Leth Jepsen
- Department of Health Technology, Technical University of Denmark, Building 423, 2800, Kgs. Lyngby, Denmark.,The Danish National Research Foundation and Villum Foundation's Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN), Technical University of Denmark, Building 423, 2800, Kgs. Lyngby, Denmark
| | - Thomas E Jensen
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, University of Copenhagen, 2100, København Ø, Denmark
| | - Martin Dufva
- Department of Health Technology, Technical University of Denmark, Building 423, 2800, Kgs. Lyngby, Denmark. .,The Danish National Research Foundation and Villum Foundation's Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN), Technical University of Denmark, Building 423, 2800, Kgs. Lyngby, Denmark.
| | - Johan U Lind
- Department of Health Technology, Technical University of Denmark, Building 423, 2800, Kgs. Lyngby, Denmark.
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56
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Ariyasinghe NR, Santoso JW, Gupta D, Pincus MJ, August PR, McCain ML. Optical Clearing of Skeletal Muscle Bundles Engineered in 3-D Printed Templates. Ann Biomed Eng 2020; 49:523-535. [PMID: 32748107 DOI: 10.1007/s10439-020-02583-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Accepted: 07/22/2020] [Indexed: 01/23/2023]
Abstract
Many techniques for engineering and interrogating three-dimensional (3-D) muscle bundles from animal- or patient-derived myoblasts have recently been developed to overcome the limitations of existing in vitro and in vivo model systems. However, many approaches for engineering 3-D muscle bundles rely on specialized and time-consuming techniques, such as photolithography for fabrication and cryosectioning for histology. Cryosectioning also limits visualization to a single plane instead of the entire 3-D structure. To address these challenges, we first implemented a consumer-grade 3-D-printer to rapidly prototype multiple templates for engineering muscle bundles. We then employed our templates to engineer 3D muscle bundles and identify template geometries that promoted bundle survival over three weeks. Subsequently, we implemented tissue clearing, immunostaining, and confocal imaging to acquire z-stacks of intact muscle bundles labelled for myogenic markers. With this approach, we could select the imaging plane on-demand and visualize the intact 3-D structure of bundles. However, tissue clearing did cause some tissue degradation that should be considered. Together, these advances in muscle tissue engineering and imaging will accelerate the use of these 3-D tissue platforms for disease modeling and therapeutic discovery.
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Affiliation(s)
- Nethika R Ariyasinghe
- Smidt Heart Institute, Cedars-Sinai Medical Center, 127 San Vicente Blvd, AHSP A9228, Los Angeles, CA, 90048, USA.,Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, 1042 Downey Way, DRB 140, Los Angeles, CA, 90089, USA.,Icagen, 2090 E. Innovation Park Dr, Oro Valley, AZ, 85755, USA
| | - Jeffrey W Santoso
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, 1042 Downey Way, DRB 140, Los Angeles, CA, 90089, USA
| | - Divya Gupta
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, 1042 Downey Way, DRB 140, Los Angeles, CA, 90089, USA
| | - Mark J Pincus
- Icagen, 2090 E. Innovation Park Dr, Oro Valley, AZ, 85755, USA.,Department of Science & CTE, Ironwood Ridge High School, 2475 W Naranja Dr, Oro Valley, AZ, 85742, USA
| | - Paul R August
- Icagen, 2090 E. Innovation Park Dr, Oro Valley, AZ, 85755, USA.,Agios Pharmaceuticals, 88 Sidney Street, Cambridge, MA, 02139, USA
| | - Megan L McCain
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, 1042 Downey Way, DRB 140, Los Angeles, CA, 90089, USA. .,Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine of USC, University of Southern California, 1975 Zonal Ave, Los Angeles, CA, 90033, USA.
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57
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Velasco-Mallorquí F, Fernández-Costa JM, Neves L, Ramón-Azcón J. New volumetric CNT-doped gelatin-cellulose scaffolds for skeletal muscle tissue engineering. NANOSCALE ADVANCES 2020; 2:2885-2896. [PMID: 36132391 PMCID: PMC9418820 DOI: 10.1039/d0na00268b] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Accepted: 05/28/2020] [Indexed: 05/23/2023]
Abstract
Currently, the fabrication of scaffolds for engineered skeletal muscle tissues is unable to reach the millimeter size. The main drawbacks are the poor nutrient diffusion, lack of an internal structure to align the precursor cells, and poor mechanical and electric properties. Herein, we present a combination of gelatin-carboxymethyl cellulose materials polymerised by a cryogelation process that allowed us to reach scaffold fabrication up to millimeter size and solve the main problems related to the large size muscle tissue constructs. (1) By incorporating carbon nanotubes (CNT), we can improve the electrical properties of the scaffold, thereby enhancing tissue maturation when applying an electric pulse stimulus (EPS). (2) We have fabricated an anisotropic internal three-dimensional microarchitecture with good pore distribution and highly aligned morphology to enhance the cell alignment, cell fusion and myotube formation. With this set up, we were able to generate a fully functional skeletal muscle tissue using a combination of EPS and our doped-biocomposite scaffold and obtain a mature tissue on the millimeter scale. We also characterized the pore distribution, swelling, stiffness and conductivity of the scaffold. Moreover, we proved that the cells were viable and could fuse in three-dimensional (3D) functional myotubes throughout the scaffold. In conclusion, we fabricated a biocompatible and customizable scaffold for 3D cell culture suitable for a wide range of applications such as organ-on-a-chip, drug screening, transplantation and disease modelling.
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Affiliation(s)
- Ferran Velasco-Mallorquí
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST) Baldiri I Reixac 10-12 Barcelona Spain
| | - Juan M Fernández-Costa
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST) Baldiri I Reixac 10-12 Barcelona Spain
| | - Luisa Neves
- Multiwave Imaging, Hotel Technoptic 2 Rue Marc Donadille 13013 Marseille France
| | - Javier Ramón-Azcón
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST) Baldiri I Reixac 10-12 Barcelona Spain
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58
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Rexius-Hall ML, Khalil NN, Andres AM, McCain ML. Mitochondrial division inhibitor 1 (mdivi-1) increases oxidative capacity and contractile stress generated by engineered skeletal muscle. FASEB J 2020; 34:11562-11576. [PMID: 32652761 DOI: 10.1096/fj.201901039rr] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 06/03/2020] [Accepted: 06/08/2020] [Indexed: 12/16/2022]
Abstract
In skeletal muscle fibers, mitochondria are densely packed adjacent to myofibrils because adenosine triphosphate (ATP) is needed to fuel sarcomere shortening. However, despite this close physical and biochemical relationship, the effects of mitochondrial dynamics on skeletal muscle contractility are poorly understood. In this study, we analyzed the effects of Mitochondrial Division Inhibitor 1 (mdivi-1), an inhibitor of mitochondrial fission, on the structure and function of both mitochondria and myofibrils in skeletal muscle tissues engineered on micromolded gelatin hydrogels. Treatment with mdivi-1 did not alter myotube morphology, but did increase the mitochondrial turbidity and oxidative capacity, consistent with reduced mitochondrial fission. Mdivi-1 also significantly increased basal, twitch, and tetanus stresses, as measured using the Muscular Thin Film (MTF) assay. Finally, mdivi-1 increased sarcomere length, potentially due to mdivi-1-induced changes in mitochondrial volume and compression of myofibrils. Together, these results suggest that mdivi-1 increases contractile stress generation, which may be caused by an increase in maximal respiration and/or sarcomere length due to increased volume of individual mitochondria. These data reinforce that mitochondria have both biochemical and biomechanical roles in skeletal muscle and that mitochondrial dynamics can be manipulated to alter muscle contractility.
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Affiliation(s)
- Megan L Rexius-Hall
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles, CA, USA
| | - Natalie N Khalil
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles, CA, USA
| | - Allen M Andres
- Smidt Heart Institute and Barbra Streisand Women's Heart Center, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Megan L McCain
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles, CA, USA.,Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, USA
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Abstract
Organs-on-chips are broadly defined as microfabricated surfaces or devices designed to engineer cells into microscale tissues with native-like features and then extract physiologically relevant readouts at scale. Because they are generally compatible with patient-derived cells, these technologies can address many of the human relevance limitations of animal models. As a result, organs-on-chips have emerged as a promising new paradigm for patient-specific disease modeling and drug development. Because neuromuscular diseases span a broad range of rare conditions with diverse etiology and complex pathophysiology, they have been especially challenging to model in animals and thus are well suited for organ-on-chip approaches. In this Review, we first briefly summarize the challenges in neuromuscular disease modeling with animal models. Next, we describe a variety of existing organ-on-chip approaches for neuromuscular tissues, including a survey of cell sources for both muscle and nerve, and two- and three-dimensional neuromuscular tissue-engineering techniques. Although researchers have made tremendous advances in modeling neuromuscular diseases on a chip, the remaining challenges in cell sourcing, cell maturity, tissue assembly and readout capabilities limit their integration into the drug development pipeline today. However, as the field advances, models of healthy and diseased neuromuscular tissues on a chip, coupled with animal models, have vast potential as complementary tools for modeling multiple aspects of neuromuscular diseases and identifying new therapeutic strategies. Summary: Modeling neuromuscular diseases is challenging due to their complex etiology and pathophysiology. Here, we review the cell sources and tissue-engineering procedures that are being integrated as emerging neuromuscular disease models.
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Affiliation(s)
- Jeffrey W Santoso
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles, CA 90089, USA
| | - Megan L McCain
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles, CA 90089, USA .,Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA 90033, USA
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60
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Kemler D, Wolff CA, Esser KA. Time-of-day dependent effects of contractile activity on the phase of the skeletal muscle clock. J Physiol 2020; 598:3631-3644. [PMID: 32537739 PMCID: PMC7479806 DOI: 10.1113/jp279779] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 05/19/2020] [Indexed: 12/16/2022] Open
Abstract
Key points Disruptions in circadian rhythms across an organism are associated with negative health outcomes, such as cardiometabolic and neurodegenerative diseases. Exercise has been proposed as a time cue for the circadian clock in rodents and humans. In this study, we assessed the effect of a single bout of endurance exercise on the skeletal muscle clock in vivo and a bout of muscle contractions in vitro. Timing of exercise or contractions influences the directional response of the muscle clock phase in vivo and in vitro. Our findings demonstrate that muscle contractions, as a component of exercise, can directly modulate the expression of muscle clock components in a time‐of‐day dependent manner.
Abstract Exercise has been proposed to be a zeitgeber for the muscle circadian clock mechanism. However, this is not well defined and it is unknown if exercise timing induces directional shifts of the muscle clock. Our purpose herein was to assess the effect of one bout of treadmill exercise on skeletal muscle clock phase changes. We subjected PERIOD2::LUCIFERASE mice (n = 30F) to one 60 min treadmill exercise bout at three times of day. Exercise at ZT5, 5 h after lights on, induced a phase advance (100.2 ± 25.8 min; P = 0.0002), whereas exercise at ZT11, 1 h before lights off, induced a phase delay (62.1 ± 21.1 min; P = 0.0003). Exercise at ZT17, middle of the dark phase, did not alter the muscle clock phase. Exercise induces diverse systemic changes so we developed an in vitro model system to examine the effects of contractile activity on muscle clock phase. Contractions applied at peak or trough Bmal1 expression induced significant phase delays (applied at peak: 27.2 ± 10.2 min; P = 0.0017; applied at trough: 64.6 ± 6.5 min, P < 0.0001). Contractions applied during the transition from peak to trough Bmal1 expression induced a phase advance (49.8 ± 23.1 min; P = 0.0051). Lastly, contractions at different times of day resulted in differential changes of core clock gene expression, demonstrating an exercise and clock interaction, providing insight into potential mechanisms of exercise‐induced phase shifts. These data demonstrate that muscle contractions, as part of exercise, are sufficient to shift the muscle circadian clock phase, likely through changes in core clock gene expression. Additionally, our findings that exercise induces directional muscle clock phase changes confirms that exercise is a bona fide environmental time cue for skeletal muscle. Disruptions in circadian rhythms across an organism are associated with negative health outcomes, such as cardiometabolic and neurodegenerative diseases. Exercise has been proposed as a time cue for the circadian clock in rodents and humans. In this study, we assessed the effect of a single bout of endurance exercise on the skeletal muscle clock in vivo and a bout of muscle contractions in vitro. Timing of exercise or contractions influences the directional response of the muscle clock phase in vivo and in vitro. Our findings demonstrate that muscle contractions, as a component of exercise, can directly modulate the expression of muscle clock components in a time‐of‐day dependent manner.
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Affiliation(s)
- Denise Kemler
- Department of Physiology and Functional Genomics, University of Florida, 1345 Center Drive, Gainesville, FL, 32610, USA.,Myology Institute, University of Florida, 1200 Newell Drive, Gainesville, FL, 32610, USA
| | - Christopher A Wolff
- Department of Physiology and Functional Genomics, University of Florida, 1345 Center Drive, Gainesville, FL, 32610, USA.,Myology Institute, University of Florida, 1200 Newell Drive, Gainesville, FL, 32610, USA
| | - Karyn A Esser
- Department of Physiology and Functional Genomics, University of Florida, 1345 Center Drive, Gainesville, FL, 32610, USA.,Myology Institute, University of Florida, 1200 Newell Drive, Gainesville, FL, 32610, USA
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Lavrador P, Gaspar VM, Mano JF. Mechanochemical Patternable ECM-Mimetic Hydrogels for Programmed Cell Orientation. Adv Healthc Mater 2020; 9:e1901860. [PMID: 32323469 DOI: 10.1002/adhm.201901860] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 03/16/2020] [Indexed: 01/10/2023]
Abstract
Native human tissues are supported by a viscoelastic extracellular matrix (ECM) that can adapt its intricate network to dynamic mechanical stimuli. To recapitulate the unique ECM biofunctionality, hydrogel design is shifting from typical covalent crosslinks toward covalently adaptable networks. To pursue such properties, herein hybrid polysaccharide-polypeptide networks are designed based on dynamic covalent assembly inspired by natural ECM crosslinking processes. This is achieved through the synthesis of an amine-reactive oxidized-laminarin biopolymer that can readily crosslink with gelatin (oxLAM-Gelatin) and simultaneously allow cell encapsulation. Interestingly, the rational design of oxLAM-Gelatin hydrogels with varying aldehyde-to-amine ratios enables a refined control over crosslinking kinetics, viscoelastic properties, and degradability profile. The mechanochemical features of these hydrogels post-crosslinking offer an alternative route for imprinting any intended nano- or microtopography in ECM-mimetic matrices bearing inherent cell-adhesive motifs. Different patterns are easily paved in oxLAM-Gelatin under physiological conditions and complex topographical configurations are retained along time. Human adipose-derived mesenchymal stem cells contacting mechanically sculpted oxLAM-Gelatin hydrogels sense the underlying surface nanotopography and align parallel to the anisotropic nanoridge/nanogroove intercalating array. These findings demonstrate that covalently adaptable features in ECM-mimetic networks can be leveraged to combine surface topography and cell-adhesive motifs as they appear in natural matrices.
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Affiliation(s)
- Pedro Lavrador
- Department of ChemistryCICECO – Aveiro Institute of MaterialsUniversity of AveiroCampus Universitário de Santiago Aveiro 3810‐193 Portugal
| | - Vítor M. Gaspar
- Department of ChemistryCICECO – Aveiro Institute of MaterialsUniversity of AveiroCampus Universitário de Santiago Aveiro 3810‐193 Portugal
| | - João F. Mano
- Department of ChemistryCICECO – Aveiro Institute of MaterialsUniversity of AveiroCampus Universitário de Santiago Aveiro 3810‐193 Portugal
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Fischetti T, Celikkin N, Contessi Negrini N, Farè S, Swieszkowski W. Tripolyphosphate-Crosslinked Chitosan/Gelatin Biocomposite Ink for 3D Printing of Uniaxial Scaffolds. Front Bioeng Biotechnol 2020; 8:400. [PMID: 32426350 PMCID: PMC7203422 DOI: 10.3389/fbioe.2020.00400] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 04/08/2020] [Indexed: 11/13/2022] Open
Abstract
Chitosan is a natural polymer widely investigated and used due to its antibacterial activity, mucoadhesive, analgesic, and hemostatic properties. Its biocompatibility makes chitosan a favorable candidate for different applications in tissue engineering (TE), such as skin, bone, and cartilage tissue regeneration. Despite promising results obtained with chitosan 3D scaffolds, significant challenges persist in fabricating hydrogel structures with ordered architectures and biological properties to mimic native tissues. In this work, chitosan has been investigated aiming at designing and fabricating uniaxial scaffolds which can be proposed for the regeneration of anisotropic tissues (i.e., skin, skeletal muscle, myocardium) by 3D printing technology. Chitosan was blended with gelatin to form a polyelectrolyte complex in two different ratios, to improve printability and shape retention. After the optimization of the printing process parameters, different crosslinking conditions were investigated, and the 3D printed samples were characterized. Tripolyphosphate (TPP) was used as crosslinker for chitosan-based scaffolds. For the optimization of the printing temperature, the sol-gel temperature of the chitosan-gelatin blend was determined by rheological measurements and extrusion temperature was set to 20°C (i.e., below sol-gel temperature). The shape fidelity and surface morphology of the 3D printed scaffolds after crosslinking was dependent on crosslinking conditions. Interestingly, mechanical properties of the scaffolds were also significantly affected by the crosslinking conditions, nonetheless the stability of the scaffolds was strongly determined by the content of gelatin in the blend. Lastly, in vitro cytocompatibility test was performed to evaluate the interactions between L929 cells and the 3D printed samples. 2% w/v chitosan and 4% w/v gelatin hydrogel scaffolds crosslinked with 10% TPP, 30 min at 4°C following 30 min at 37°C have shown cytocompatible and stable characteristics, compared to all other tested conditions, showing suitable properties for the regeneration of anisotropic tissues.
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Affiliation(s)
- Tiziana Fischetti
- Faculty of Materials Science and Engineering, Warsaw University of Technology, Warsaw, Poland.,Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, Milan, Italy
| | - Nehar Celikkin
- Faculty of Materials Science and Engineering, Warsaw University of Technology, Warsaw, Poland
| | - Nicola Contessi Negrini
- Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, Milan, Italy.,INSTM, National Consortium of Materials Science and Technology, Local Unit Politecnico di Milano, Milan, Italy
| | - Silvia Farè
- Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, Milan, Italy.,INSTM, National Consortium of Materials Science and Technology, Local Unit Politecnico di Milano, Milan, Italy
| | - Wojciech Swieszkowski
- Faculty of Materials Science and Engineering, Warsaw University of Technology, Warsaw, Poland
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63
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Mao W, Lee S, Shin JU, Yoo HS. Surface-Initiated Atom Transfer Polymerized Anionic Corona on Gold Nanoparticles for Anti-Cancer Therapy. Pharmaceutics 2020; 12:pharmaceutics12030261. [PMID: 32183045 PMCID: PMC7150926 DOI: 10.3390/pharmaceutics12030261] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 03/10/2020] [Accepted: 03/11/2020] [Indexed: 01/25/2023] Open
Abstract
Surface initiated atom transfer radical polymerization (SI-ATRP) documented a simple but efficient technique to grow a dense polymer layer on any surface. Gold nanoparticles (AuNPs) give a broad surface to immobilize sulfhyryl group-containing initiators for SI-ATRP; in addition, AuNPs are the major nanoparticulate carriers for delivery of anti-cancer therapeutics, since they are biocompatible and bioinert. In this work, AuNPs with a disulfide initiator were polymerized with sulfoethyl methacrylate by SI-ATRP to decorate the particles with anionic corona, and branched polyethyeleneimine (PEI) and siRNA were sequentially layered onto the anionic corona of AuNP by electrostatic interaction. The in vitro anti-cancer effect confirmed that AuNP with anionic corona showed higher degrees of apoptosis as well as suppression of the oncogene expression in a siRNA dose-dependent manner. The in vivo study of tumor-bearing nude mice revealed that mice treated with c-Myc siRNA-incorporated AuNPs showed dramatically decreased tumor size in comparison to those with free siRNA for 4 weeks. Furthermore, histological examination and gene expression study revealed that the decorated AuNP significantly suppressed c-Myc expression. Thus, we envision that the layer-by-layer assembly on the anionic brushes can be potentially used to incorporate nucleic acids onto metallic particles with high transfection efficiency.
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Affiliation(s)
- Wei Mao
- Department of Biomedical Materials Engineering, Kangwon National University, Chuncheon 24341, Korea; (W.M.); (S.L.); (J.U.S.)
| | - Sol Lee
- Department of Biomedical Materials Engineering, Kangwon National University, Chuncheon 24341, Korea; (W.M.); (S.L.); (J.U.S.)
| | - Ji Un Shin
- Department of Biomedical Materials Engineering, Kangwon National University, Chuncheon 24341, Korea; (W.M.); (S.L.); (J.U.S.)
| | - Hyuk Sang Yoo
- Department of Biomedical Materials Engineering, Kangwon National University, Chuncheon 24341, Korea; (W.M.); (S.L.); (J.U.S.)
- Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Korea
- Correspondence: ; Tel.: +82-33-250-6563
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Besser RR, Bowles AC, Alassaf A, Carbonero D, Claure I, Jones E, Reda J, Wubker L, Batchelor W, Ziebarth N, Silvera R, Khan A, Maciel R, Saporta M, Agarwal A. Enzymatically crosslinked gelatin-laminin hydrogels for applications in neuromuscular tissue engineering. Biomater Sci 2020; 8:591-606. [PMID: 31859298 PMCID: PMC7141910 DOI: 10.1039/c9bm01430f] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
We report a water-soluble and non-toxic method to incorporate additional extracellular matrix proteins into gelatin hydrogels, while obviating the use of chemical crosslinkers such as glutaraldehyde. Gelatin hydrogels were fabricated using a range of gelatin concentrations (4%-10%) that corresponded to elastic moduli of approximately 1 kPa-25 kPa, respectively, a substrate stiffness relevant for multiple cell types. Microbial transglutaminase was then used to enzymatically crosslink a layer of laminin on top of gelatin hydrogels, resulting in 2-component gelatin-laminin hydrogels. Human induced pluripotent stem cell derived spinal spheroids readily adhered and rapidly extended axons on GEL-LN hydrogels. Axons displayed a more mature morphology and superior electrophysiological properties on GEL-LN hydrogels compared to the controls. Schwann cells on GEL-LN hydrogels adhered and proliferated normally, displayed a healthy morphology, and maintained the expression of Schwann cell specific markers. Lastly, skeletal muscle cells on GEL-LN hydrogels achieved long-term culture for up to 28 days without delamination, while expressing higher levels of terminal genes including myosin heavy chain, MyoD, MuSK, and M-cadherin suggesting enhanced maturation potential and myotube formation compared to the controls. Future studies will employ the superior culture outcomes of this hybrid substrate for engineering functional neuromuscular junctions and related organ on a chip applications.
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Affiliation(s)
- Rachel R Besser
- Department of Biomedical Engineering, University of Miami, 1251 Memorial Dr, MEA 203, Coral Gables, FL 33146, USA.
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Jang Y, Jung DJ, Choi SC, Lim DS, Kim JH, Jeoung GS, Kim J, Park Y. Multidimensional assembly using layer-by-layer deposition for synchronized cardiac macro tissues. RSC Adv 2020; 10:18806-18815. [PMID: 35693693 PMCID: PMC9122566 DOI: 10.1039/d0ra01577f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 06/04/2020] [Accepted: 04/29/2020] [Indexed: 12/13/2022] Open
Abstract
The fabrication of biomimetic structures for tissues and organs is emerging in the fields of biomedical engineering and precision medicine. While current progress in biomedical research provides a number of biofabrication methods, the construction of multi-dimensional cardiac tissue is highly challenging due to difficulties in the maturation and synchronization of cardiomyocytes (CMs) in conjunction with other types of cells, such as myofibroblasts and endothelial cells. Here, we show a simple fabrication methodology to construct multi-dimensional cardiac macro tissue (mCMT) by layer-by-layer (LBL) deposition of cells on micro patterned PDMS. mCMTs formed by LBL deposition of pluripotent stem cell (PSC)-derived cardiomyocytes and cardiac fibroblasts formed 3D patterned structures with synchronized beating characteristics. We also demonstrate that cardiac maturation factors such as the gene expression of MLC2v and cTNI and formation of sarcomeres in mCMTs were significantly enhanced by LBL deposition and growth factors during the maturation process. Fabrication of matured mCMTs with synchronized beating enables providing an efficient platform for evaluating the efficacy and toxicity of drug candidates. These results have important implications because mCMTs are applicable to diverse in vitro studies and drug screening methods that require tissue-like structures and functions in a physiological environment. We fabricated a cardiac macro tissue with synchronized beating by layer-by-layer deposition and evaluated the effect of drug candidates.![]()
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Affiliation(s)
- Yongjun Jang
- Department of Biomedical Sciences, College of Medicine, Korea University, Seoul, Korea
| | - Da Jung Jung
- Biomedical Engineering Research Center, Asan Institute for Life Sciences, Asan Medical Center, Seoul, Korea
| | - Seung-Cheol Choi
- Departments of Cardiology, Cardiovascular Center, Korea University Anam Hospital, Seoul, Korea
| | - Do-Sun Lim
- Departments of Cardiology, Cardiovascular Center, Korea University Anam Hospital, Seoul, Korea
| | - Jong-Hoon Kim
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, Korea
| | - Gi Seok Jeoung
- Biomedical Engineering Research Center, Asan Institute for Life Sciences, Asan Medical Center, Seoul, Korea
| | - Jongseong Kim
- Department of Biomedical Sciences, College of Medicine, Korea University, Seoul, Korea
| | - Yongdoo Park
- Department of Biomedical Sciences, College of Medicine, Korea University, Seoul, Korea
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67
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Mao W, Lee S, Kim SR, Kim KN, Yoo HS. Electrospun nanohybrid hydrogels for enhanced differentiation of myoblasts. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2019.07.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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68
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Almonacid Suarez AM, Zhou Q, van Rijn P, Harmsen MC. Directional topography gradients drive optimum alignment and differentiation of human myoblasts. J Tissue Eng Regen Med 2019; 13:2234-2245. [PMID: 31677226 PMCID: PMC6973069 DOI: 10.1002/term.2976] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2019] [Revised: 09/06/2019] [Accepted: 09/26/2019] [Indexed: 12/20/2022]
Abstract
Tissue engineering of skeletal muscle aims to replicate the parallel alignment of myotubes on the native tissue. Directional topography gradients allow the study of the influence of topography on cellular orientation, proliferation, and differentiation, resulting in yield cues and clues to develop a proper in vitro environment for muscle tissue engineering. In this study, we used a polydimethylsiloxane-based substrate containing an aligned topography gradient with sinusoidal features ranging from wavelength (λ) = 1,520 nm and amplitude (A) =176 nm to λ = 9,934 nm and A = 2,168 nm. With this topography gradient, we evaluated the effect of topography on human myoblasts distribution, dominant orientation, cell area, nuclei coverage, cell area per number of nuclei, and nuclei area of myotubes. We showed that human myoblasts aligned and differentiated irrespective of the topography section. In addition, aligned human myotubes showed functionality and maturity by contracting spontaneously and nuclei peripheral organization resembling natural myotubes.
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Affiliation(s)
- Ana Maria Almonacid Suarez
- Department of Pathology and Medical Biology, University Medical Center GroningenUniversity of GroningenGroningenThe Netherlands
| | - Qihui Zhou
- Department of Biomedical Engineering, W.J. Kolff Institute for Biomedical Engineering and Materials Science, University Medical Center GroningenUniversity of GroningenGroningenThe Netherlands
| | - Patrick van Rijn
- Department of Biomedical Engineering, W.J. Kolff Institute for Biomedical Engineering and Materials Science, University Medical Center GroningenUniversity of GroningenGroningenThe Netherlands
- Zernike Institute for Advanced MaterialsUniversity of GroningenGroningenThe Netherlands
| | - Martin C. Harmsen
- Department of Pathology and Medical Biology, University Medical Center GroningenUniversity of GroningenGroningenThe Netherlands
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69
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Yeo M, Kim G. Nano/microscale topographically designed alginate/PCL scaffolds for inducing myoblast alignment and myogenic differentiation. Carbohydr Polym 2019; 223:115041. [DOI: 10.1016/j.carbpol.2019.115041] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 06/28/2019] [Accepted: 06/28/2019] [Indexed: 12/31/2022]
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70
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Gopal A, Herr AE. Multiplexed in-gel microfluidic immunoassays: characterizing protein target loss during reprobing of benzophenone-modified hydrogels. Sci Rep 2019; 9:15389. [PMID: 31659305 PMCID: PMC6817870 DOI: 10.1038/s41598-019-51849-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Accepted: 09/27/2019] [Indexed: 12/28/2022] Open
Abstract
From whole tissues to single-cell lysate, heterogeneous immunoassays are widely utilized for analysis of protein targets in complex biospecimens. Recently, benzophenone-functionalized hydrogel scaffolds have been used to immobilize target protein for immunoassay detection with fluorescent antibody probes. In benzophenone-functionalized hydrogels, multiplex target detection occurs via serial rounds of chemical stripping (incubation with sodium-dodecyl-sulfate (SDS) and β-mercaptoethanol at 50-60 °C for ≥1 h), followed by reprobing (interrogation with additional antibody probes). Although benzophenone facilitates covalent immobilization of proteins to the hydrogel, we observe 50% immunoassay signal loss of immobilized protein targets during stripping rounds. Here, we identify and characterize signal loss mechanisms during stripping and reprobing. We posit that loss of immobilized target is responsible for ≥50% of immunoassay signal loss, and that target loss is attributable to disruption of protein immobilization by denaturing detergents (SDS) and incubation at elevated temperatures. Furthermore, our study suggests that protein losses under non-denaturing conditions are more sensitive to protein structure (i.e., hydrodynamic radius), than to molecular mass (size). We formulate design guidance for multiplexed in-gel immunoassays, including that low-abundance proteins be immunoprobed first, even when targets are covalently immobilized to the gel. We also recommend careful scrutiny of the order of proteins targets detected via multiple immunoprobing cycles, based on the protein immobilization buffer composition.
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Affiliation(s)
- Anjali Gopal
- Department of Bioengineering, University of California, Berkeley, Berkeley, California, 94720, United States
- UC Berkeley/UCSF Graduate Program in Bioengineering, University of California, Berkeley, Berkeley, California, 94720, United States
| | - Amy E Herr
- Department of Bioengineering, University of California, Berkeley, Berkeley, California, 94720, United States.
- UC Berkeley/UCSF Graduate Program in Bioengineering, University of California, Berkeley, Berkeley, California, 94720, United States.
- Chan Zuckerberg BioHub, San Francisco, California, 94158, United States.
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71
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Lyra-Leite DM, Andres AM, Cho N, Petersen AP, Ariyasinghe NR, Kim SS, Gottlieb RA, McCain ML. Matrix-guided control of mitochondrial function in cardiac myocytes. Acta Biomater 2019; 97:281-295. [PMID: 31401347 PMCID: PMC6801042 DOI: 10.1016/j.actbio.2019.08.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Revised: 07/31/2019] [Accepted: 08/02/2019] [Indexed: 02/08/2023]
Abstract
In ventricular myocardium, extracellular matrix (ECM) remodeling is a hallmark of physiological and pathological growth, coincident with metabolic rewiring of cardiac myocytes. However, the direct impact of the biochemical and mechanical properties of the ECM on the metabolic function of cardiac myocytes is mostly unknown. Furthermore, understanding the impact of distinct biomaterials on cardiac myocyte metabolism is critical for engineering physiologically-relevant models of healthy and diseased myocardium. For these reasons, we systematically measured morphological and metabolic responses of neonatal rat ventricular myocytes cultured on fibronectin- or gelatin-coated polydimethylsiloxane (PDMS) of three elastic moduli and gelatin hydrogels with four elastic moduli. On all substrates, total protein content, cell morphology, and the ratio of mitochondrial DNA to nuclear DNA were preserved. Cytotoxicity was low on all substrates, although slightly higher on PDMS compared to gelatin hydrogels. We also quantified oxygen consumption rates and extracellular acidification rates using a Seahorse extracellular flux analyzer. Our data indicate that several metrics associated with baseline glycolysis and baseline and maximum mitochondrial function are enhanced when cardiac myocytes are cultured on gelatin hydrogels compared to all PDMS substrates, irrespective of substrate rigidity. These results yield new insights into how mechanical and biochemical cues provided by the ECM impact mitochondrial function in cardiac myocytes. STATEMENT OF SIGNIFICANCE: Cardiac development and disease are associated with remodeling of the extracellular matrix coincident with metabolic rewiring of cardiac myocytes. However, little is known about the direct impact of the biochemical and mechanical properties of the extracellular matrix on the metabolic function of cardiac myocytes. In this study, oxygen consumption rates were measured in neonatal rat ventricular myocytes maintained on several commonly-used biomaterial substrates to reveal new relationships between the extracellular matrix and cardiac myocyte metabolism. Several mitochondrial parameters were enhanced on gelatin hydrogels compared to synthetic PDMS substrates. These data are important for comprehensively understanding matrix-regulation of cardiac myocyte physiology. Additionally, these data should be considered when selecting scaffolds for engineering in vitro cardiac tissue models.
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Affiliation(s)
- Davi M Lyra-Leite
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles CA, 90089, United States
| | - Allen M Andres
- Smidt Heart Institute and Barbra Streisand Women's Heart Center, Cedars-Sinai Medical Center, Los Angeles CA, 90048, United States
| | - Nathan Cho
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles CA, 90089, United States
| | - Andrew P Petersen
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles CA, 90089, United States
| | - Nethika R Ariyasinghe
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles CA, 90089, United States
| | - Suyon Sarah Kim
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles CA, 90089, United States
| | - Roberta A Gottlieb
- Smidt Heart Institute and Barbra Streisand Women's Heart Center, Cedars-Sinai Medical Center, Los Angeles CA, 90048, United States
| | - Megan L McCain
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles CA, 90089, United States; Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine of USC, University of Southern California, Los Angeles CA, 90033, United States.
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Park J, Choi JH, Kim S, Jang I, Jeong S, Lee JY. Micropatterned conductive hydrogels as multifunctional muscle-mimicking biomaterials: Graphene-incorporated hydrogels directly patterned with femtosecond laser ablation. Acta Biomater 2019; 97:141-153. [PMID: 31352108 DOI: 10.1016/j.actbio.2019.07.044] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 07/23/2019] [Accepted: 07/24/2019] [Indexed: 12/20/2022]
Abstract
Multifunctional biomaterials that can provide physical, electrical, and structural cues to cells and tissues are highly desirable to mimic the important characteristics of native tissues and efficiently modulate cellular behaviors. Especially, electrically conductive biomaterials can efficiently deliver electrical signals to living systems; however, the production of conductive biomaterials presenting multiple cell interactive cues is still a great challenge. In this study, we fabricafed an electrically conductive, mechanically soft, and topographically active hydrogel by micropatterning a graphene oxide (GO)-incorporated polyacrylamide hydrogel (GO/PAAm) with femtosecond laser ablation (FLA) and subsequent chemical reduction. FLA parameters were optimized to efficiently produce distinct line patterns on GO/PAAm hydrogels to induce myoblast alignment and maturation. The line patterns distances (PD) were varied to have different topographies (20-80 μm PD). In vitro studies with C2C12 myoblasts revealed that the micopatterned hydrogels are superior to the unpatterned substrates in inducing myogenesis and myotube alignment. Reduced GO/PAAm with 50 μm PD, i.e., PD50/r(GO/PAAm), showed the best results among the various features for differentiation and myotube alignment. Electrical stimulation of myoblasts on the micropatterned conductive hydrogels further promoted the differentiation of myoblasts. In vivo implantation studies indicated good tissue compatibility of PD50/r(GO/PAAm) samples. Altogether, we successfully demonstrated that the micropatterned r(GO/PAAm) may offer multiple properties capable of positively affecting myoblast responses. This hydrogel may serve as an effective multifunctional biomaterial, which possesses the topography for cell alignment/maturation, mechanical properties of the native skeletal muscle tissue, and desirable electrical conductivity for delivering electrical signals to cells, for various biomedical applications such as muscle tissue scaffolds. STATEMENT OF SIGNIFICANCE: Micropatterned conductive hydrogels were created by polymerization of a graphene oxide-incorporated polyacrylamide hydrogel, micropatterning with femtosecond laser ablation, and chemical reduction, which can mimic important characteristics of native skeletal muscle tissues. The micropatterned conductive hydro-gels promoted myogenesis/alignment, enabled electrical stimulation of myoblasts, and displayed good tissue compatibility, which can therefore serve as a multifunctional biomaterial that is topographically active, mechanically soft, and electrically conductive for delivering multiple cell stimulating signals for potential skeletal muscle tissue engineering applications.
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Jiwlawat N, Lynch EM, Napiwocki BN, Stempien A, Ashton RS, Kamp TJ, Crone WC, Suzuki M. Micropatterned substrates with physiological stiffness promote cell maturation and Pompe disease phenotype in human induced pluripotent stem cell-derived skeletal myocytes. Biotechnol Bioeng 2019; 116:2377-2392. [PMID: 31131875 DOI: 10.1002/bit.27075] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 04/19/2019] [Accepted: 05/21/2019] [Indexed: 12/23/2022]
Abstract
Recent advances in bioengineering have enabled cell culture systems that more closely mimic the native cellular environment. Here, we demonstrated that human induced pluripotent stem cell (iPSC)-derived myogenic progenitors formed highly-aligned myotubes and contracted when seeded on two-dimensional micropatterned platforms. The differentiated cells showed clear nuclear alignment and formed elongated myotubes dependent on the width of the micropatterned lanes. Topographical cues from micropatterning and physiological substrate stiffness improved the formation of well-aligned and multinucleated myotubes similar to myofibers. These aligned myotubes exhibited spontaneous contractions specifically along the long axis of the pattern. Notably, the micropatterned platforms developed bundle-like myotubes using patient-derived iPSCs with a background of Pompe disease (glycogen storage disease type II) and even enhanced the disease phenotype as shown through the specific pathology of abnormal lysosome accumulations. A highly-aligned formation of matured myotubes holds great potential in further understanding the process of human muscle development, as well as advancing in vitro pharmacological studies for skeletal muscle diseases.
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Affiliation(s)
- Nunnapas Jiwlawat
- Department of Comparative Biosciences, University of Wisconsin, Madison, Wisconsin
| | - Eileen M Lynch
- Department of Comparative Biosciences, University of Wisconsin, Madison, Wisconsin
| | - Brett N Napiwocki
- Wisconsin Institute for Discovery, University of Wisconsin, Madison, Wisconsin.,Department of Biomedical Engineering, University of Wisconsin, Madison, Wisconsin
| | - Alana Stempien
- Wisconsin Institute for Discovery, University of Wisconsin, Madison, Wisconsin.,Department of Biomedical Engineering, University of Wisconsin, Madison, Wisconsin
| | - Randolph S Ashton
- Wisconsin Institute for Discovery, University of Wisconsin, Madison, Wisconsin.,Department of Biomedical Engineering, University of Wisconsin, Madison, Wisconsin.,The Stem Cell and Regenerative Medicine Center, University of Wisconsin, Madison, Wisconsin
| | - Timothy J Kamp
- Department of Medicine, University of Wisconsin, Madison, Wisconsin.,The Stem Cell and Regenerative Medicine Center, University of Wisconsin, Madison, Wisconsin.,Department of Cell and Regenerative Biology, University of Wisconsin, Madison, Wisconsin
| | - Wendy C Crone
- Wisconsin Institute for Discovery, University of Wisconsin, Madison, Wisconsin.,Department of Biomedical Engineering, University of Wisconsin, Madison, Wisconsin.,The Stem Cell and Regenerative Medicine Center, University of Wisconsin, Madison, Wisconsin.,Department of Engineering Physics, University of Wisconsin, Madison, Wisconsin
| | - Masatoshi Suzuki
- Department of Comparative Biosciences, University of Wisconsin, Madison, Wisconsin.,Department of Biomedical Engineering, University of Wisconsin, Madison, Wisconsin.,The Stem Cell and Regenerative Medicine Center, University of Wisconsin, Madison, Wisconsin
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74
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Denes LT, Riley LA, Mijares JR, Arboleda JD, McKee K, Esser KA, Wang ET. Culturing C2C12 myotubes on micromolded gelatin hydrogels accelerates myotube maturation. Skelet Muscle 2019; 9:17. [PMID: 31174599 PMCID: PMC6555731 DOI: 10.1186/s13395-019-0203-4] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Accepted: 05/30/2019] [Indexed: 12/17/2022] Open
Abstract
Background Skeletal muscle contributes to roughly 40% of lean body mass, and its loss contributes to morbidity and mortality in a variety of pathogenic conditions. Significant insights into muscle function have been made using cultured cells, in particular, the C2C12 myoblast line. However, differentiation of these cells in vitro typically yields immature myotubes relative to skeletal muscles in vivo. While many efforts have attempted to improve the maturity of cultured myotubes, including the use of bioengineered substrates, lack of molecular characterization has precluded their widespread implementation. This study characterizes morphological, molecular, and transcriptional features of C2C12 myotubes cultured on crosslinked, micropatterned gelatin substrates fabricated using previously established methods and compares them to myotubes grown on unpatterned gelatin or traditional plasticware. Methods We used immunocytochemistry, SDS-PAGE, and RNAseq to characterize C2C12 myotubes grown on micropatterned gelatin hydrogels, unpatterned gelatin hydrogels, and typical cell culture substrates (i.e., plastic or collagen-coated glass) across a differentiation time course. The ability to form aligned sarcomeres and myofilament protein concentration was assessed. Additionally, the transcriptome was analyzed across the differentiation time course. Results C2C12 myotubes grown on micropatterned gelatin hydrogels display an increased ability to form aligned sarcomeres as well as increased contractile protein content relative to myotubes cultured on unpatterned gelatin and plastic. Additionally, genes related to sarcomere formation and in vivo muscle maturation are upregulated in myotubes grown on micropatterned gelatin hydrogels relative to control myotubes. Conclusions Our results suggest that growing C2C12 myotubes on micropatterned gelatin hydrogels accelerates sarcomere formation and yields a more fully matured myotube culture. Thus, the use of micropatterned hydrogels is a viable and simple approach to better model skeletal muscle biology in vitro. Electronic supplementary material The online version of this article (10.1186/s13395-019-0203-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Lance T Denes
- Department of Molecular Genetics and Microbiology, Center for Neurogenetics, Myology Institute, College of Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Lance A Riley
- Department of Physiology and Functional Genomics, Myology Institute, College of Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Joseph R Mijares
- Department of Physiology and Functional Genomics, Myology Institute, College of Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Juan D Arboleda
- Department of Molecular Genetics and Microbiology, Center for Neurogenetics, Myology Institute, College of Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Kendra McKee
- Department of Molecular Genetics and Microbiology, Center for Neurogenetics, Myology Institute, College of Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Karyn A Esser
- Department of Physiology and Functional Genomics, Myology Institute, College of Medicine, University of Florida, Gainesville, FL, 32610, USA.
| | - Eric T Wang
- Department of Molecular Genetics and Microbiology, Center for Neurogenetics, Myology Institute, College of Medicine, University of Florida, Gainesville, FL, 32610, USA.
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75
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Campuzano S, Pelling AE. Scaffolds for 3D Cell Culture and Cellular Agriculture Applications Derived From Non-animal Sources. FRONTIERS IN SUSTAINABLE FOOD SYSTEMS 2019. [DOI: 10.3389/fsufs.2019.00038] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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76
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Davis BNJ, Santoso JW, Walker MJ, Oliver CE, Cunningham MM, Boehm CA, Dawes D, Lasater SL, Huffman K, Kraus WE, Truskey GA. Modeling the Effect of TNF-α upon Drug-Induced Toxicity in Human, Tissue-Engineered Myobundles. Ann Biomed Eng 2019; 47:1596-1610. [PMID: 30963383 DOI: 10.1007/s10439-019-02263-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Accepted: 04/02/2019] [Indexed: 12/25/2022]
Abstract
A number of significant muscle diseases, such as cachexia, sarcopenia, systemic chronic inflammation, along with inflammatory myopathies share TNF-α-dominated inflammation in their pathogenesis. In addition, inflammatory episodes may increase susceptibility to drug toxicity. To assess the effect of TNF-α-induced inflammation on drug responses, we engineered 3D, human skeletal myobundles, chronically exposed them to TNF-α during maturation, and measured the combined response of TNF-α and the chemotherapeutic doxorubicin on muscle function. First, the myobundle inflammatory environment was characterized by assessing the effects of TNF-α on 2D human skeletal muscle cultures and 3D human myobundles. High doses of TNF-α inhibited maturation in human 2D cultures and maturation and function in 3D myobundles. Then, a tetanus force dose-response curve was constructed to characterize doxorubicin's effects on function alone. The combination of TNF-α and 10 nM doxorubicin exhibited a synergistic effect on both twitch and tetanus force production. Overall, the results demonstrated that inflammation of a 3D, human skeletal muscle inflammatory system alters the response to doxorubicin.
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Affiliation(s)
- Brittany N J Davis
- Department of Biomedical Engineering, Duke University, Durham, NC, 27705, USA
| | - Jeffrey W Santoso
- Department of Biomedical Engineering, Duke University, Durham, NC, 27705, USA
| | - Michaela J Walker
- Department of Biomedical Engineering, Duke University, Durham, NC, 27705, USA
| | - Catherine E Oliver
- Department of Biomedical Engineering, Duke University, Durham, NC, 27705, USA
| | - Michael M Cunningham
- Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Christian A Boehm
- Department of Textile Technology, RWTH Aachen University, 52062, Aachen, Germany
| | - Danielle Dawes
- Department of Biomedical Engineering, Duke University, Durham, NC, 27705, USA
| | - Samantha L Lasater
- Department of Biomedical Engineering, Duke University, Durham, NC, 27705, USA
| | - Kim Huffman
- Duke Molecular Physiology Institute, Duke University Medical Center, Durham, NC, 27701, USA.,Department of Medicine, Duke University Medical Center, Durham, NC, 27710, USA
| | - William E Kraus
- Duke Molecular Physiology Institute, Duke University Medical Center, Durham, NC, 27701, USA.,Department of Medicine, Duke University Medical Center, Durham, NC, 27710, USA.,Department of Cardiology, Duke University Medical Center, Durham, NC, 27710, USA
| | - George A Truskey
- Department of Biomedical Engineering, Duke University, Durham, NC, 27705, USA. .,, 1395 FCIEMS, 101 Science Drive, Durham, NC, 27708-0281, USA.
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77
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Yamaoka N, Shimizu K, Imaizumi Y, Ito T, Okada Y, Honda H. Open-Chamber Co-Culture Microdevices for Single-Cell Analysis of Skeletal Muscle Myotubes and Motor Neurons with Neuromuscular Junctions. BIOCHIP JOURNAL 2019. [DOI: 10.1007/s13206-018-3202-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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78
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Compaan AM, Song K, Huang Y. Gellan Fluid Gel as a Versatile Support Bath Material for Fluid Extrusion Bioprinting. ACS APPLIED MATERIALS & INTERFACES 2019; 11:5714-5726. [PMID: 30644714 DOI: 10.1021/acsami.8b13792] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Biomedical applications of three-dimensional (3D) printing demand complex hydrogel-based constructs laden with living cells. Advanced support materials facilitate the fabrication of such constructs. This work demonstrates the versatility and utility of a gellan fluid gel as a support bath material for fabricating freeform 3D hydrogel constructs from a variety of materials. Notably, the gellan fluid gel support bath can supply sensitive biological cross-linking agents such as enzymes to printed fluid hydrogel precursors for mild covalent hydrogel cross-linking. This mild fabrication approach is suitable for fabricating cell-laden gelatin-based constructs in which mammalian cells can form intercellular contacts within hours of fabrication; cellular activity is observed over several days within printed constructs. In addition, gellan is compatible with a wide range of ionic and thermal conditions, which makes it a suitable support material for ionically cross-linked structures generated by printing alginate-based ink formulations as well as thermosensitive hydrogel constructs formed from gelatin. Ultraviolet irradiation of printed structures within the support bath is also demonstrated for photoinitiated cross-linking of acrylated ink materials. Furthermore, gellan support material performance in terms of printed filament stability and residual support material on constructs is found to be comparable and superior, respectively, to previously reported support materials.
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79
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Kim J, Leem J, Kim HN, Kang P, Choi J, Haque MF, Kang D, Nam S. Uniaxially crumpled graphene as a platform for guided myotube formation. MICROSYSTEMS & NANOENGINEERING 2019; 5:53. [PMID: 31700672 PMCID: PMC6826050 DOI: 10.1038/s41378-019-0098-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2019] [Revised: 07/05/2019] [Accepted: 08/19/2019] [Indexed: 05/23/2023]
Abstract
Graphene, owing to its inherent chemical inertness, biocompatibility, and mechanical flexibility, has great potential in guiding cell behaviors such as adhesion and differentiation. However, due to the two-dimensional (2D) nature of graphene, the microfabrication of graphene into micro/nanoscale patterns has been widely adopted for guiding cellular assembly. In this study, we report crumpled graphene, i.e., monolithically defined graphene with a nanoscale wavy surface texture, as a tissue engineering platform that can efficiently promote aligned C2C12 mouse myoblast cell differentiation. We imparted out-of-plane, nanoscale crumpled morphologies to flat graphene via compressive strain-induced deformation. When C2C12 mouse myoblast cells were seeded on the uniaxially crumpled graphene, not only were the alignment and elongation promoted at a single-cell level but also the differentiation and maturation of myotubes were enhanced compared to that on flat graphene. These results demonstrate the utility of the crumpled graphene platform for tissue engineering and regenerative medicine for skeletal muscle tissues.
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Affiliation(s)
- Junghoon Kim
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801 USA
| | - Juyoung Leem
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801 USA
| | - Hong Nam Kim
- Center for BioMicrosystems, Brain Science Institute, Korea Institute of Science and Technology (KIST), Seoul, 02792 Republic of Korea
- Division of Bio-Medical Science and Technology, KIST School, Korea University of Science and Technology, Seoul, 02792 Republic of Korea
| | - Pilgyu Kang
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801 USA
- Department of Mechanical Engineering, George Mason University, Fairfax, VA 22030 USA
| | - Jonghyun Choi
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801 USA
| | - Md Farhadul Haque
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801 USA
| | - Daeshik Kang
- Department of Mechanical Engineering, Ajou University, Suwon, 16499 Republic of Korea
| | - SungWoo Nam
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801 USA
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801 USA
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80
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Xu B, Magli A, Anugrah Y, Koester SJ, Perlingeiro RCR, Shen W. Nanotopography-responsive myotube alignment and orientation as a sensitive phenotypic biomarker for Duchenne Muscular Dystrophy. Biomaterials 2018; 183:54-66. [PMID: 30149230 PMCID: PMC6239205 DOI: 10.1016/j.biomaterials.2018.08.047] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 08/09/2018] [Accepted: 08/20/2018] [Indexed: 01/08/2023]
Abstract
Duchenne Muscular Dystrophy (DMD) is a fatal genetic disorder currently having no cure. Here we report that culture substrates patterned with nanogrooves and functionalized with Matrigel (or laminin) present an engineered cell microenvironment to allow myotubes derived from non-diseased, less-affected DMD, and severely-affected DMD human induced pluripotent stem cells (hiPSCs) to exhibit prominent differences in alignment and orientation, providing a sensitive phenotypic biomarker to potentially facilitate DMD drug development and early diagnosis. We discovered that myotubes differentiated from myogenic progenitors derived from non-diseased hiPSCs align nearly perpendicular to nanogrooves, a phenomenon not reported previously. We further found that myotubes derived from hiPSCs of a dystrophin-null DMD patient orient randomly, and those from hiPSCs of a patient carrying partially functional dystrophin align approximately 14° off the alignment direction of non-diseased myotubes. Substrates engineered with micron-scale grooves and/or cell adhesion molecules only interacting with integrins all guide parallel myotube alignment to grooves and lose the ability to distinguish different cell types. Disruption of the interaction between the Dystrophin-Associated-Protein-Complex (DAPC) and laminin by heparin or anti-α-dystroglycan antibody IIH6 disenables myotubes to align perpendicular to nanogrooves, suggesting that this phenotype is controlled by the DAPC-mediated cytoskeleton-extracellular matrix linkage.
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Affiliation(s)
- Bin Xu
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN 55455, USA
| | - Alessandro Magli
- Department of Medicine, University of Minnesota, Minneapolis, MN 55455, USA; Stem Cell Institute, University of Minnesota, Minneapolis, MN 55455, USA
| | - Yoska Anugrah
- Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455, USA
| | - Steven J Koester
- Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455, USA; Institute for Engineering in Medicine, University of Minnesota, Minneapolis, MN 55455, USA
| | - Rita C R Perlingeiro
- Department of Medicine, University of Minnesota, Minneapolis, MN 55455, USA; Stem Cell Institute, University of Minnesota, Minneapolis, MN 55455, USA; Institute for Engineering in Medicine, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Wei Shen
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN 55455, USA; Stem Cell Institute, University of Minnesota, Minneapolis, MN 55455, USA; Institute for Engineering in Medicine, University of Minnesota, Minneapolis, MN 55455, USA.
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81
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Chitara B, Ya'akobovitz A. Elastic properties and breaking strengths of GaS, GaSe and GaTe nanosheets. NANOSCALE 2018; 10:13022-13027. [PMID: 29924113 DOI: 10.1039/c8nr01065j] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Gallium sulphide (GaS), gallium selenide (GaSe), and gallium telluride (GaTe), belonging to the group-III monochalcogenide family, have shown promising optoelectronic performance over graphene and monolayer molybdenum disulphide (MoS2). However, to date, the mechanical properties of these materials have not been investigated, which hinders their utilisation in flexible electronics and optomechanics. Here, we characterize the elastic properties and breaking strengths of suspended two-dimensional (2D) nanosheets of GaS, GaSe, and GaTe, using atomic force microscopy. The 2D Young's modulus values of ∼10 nm thick GaS, GaSe, and GaTe were found to be 1732 ± 154 N m-1, 819 ± 127 N m-1, and 246 ± 160 N m-1, respectively, corresponding to the three-dimensional (3D) Young's modulus values of 173 ± 15 GPa, 81.9 ± 12.7 GPa, and 24.6 ± 16 GPa, respectively. The pre-tension values of these nanosheets were estimated to be 0.34 ± 0.12 N m-1, 0.14 ± 0.04 N m-1, and 0.15 ± 0.03 N m-1 for GaS, GaSe, and GaTe, respectively. GaS nanosheets exhibited the highest Young's modulus (173 GPa) among these nanosheets, which is comparable to that of WS2 and WSe2. A failure characteristic study over these group-III monochalcogenides revealed that these materials can withstand stresses of up to 8 GPa and a maximal strain of 7% before breaking. Altogether, our findings indicate that GaS, GaSe, and GaTe are attractive candidates for use in stretchable electronic applications and in future optomechanical devices.
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Affiliation(s)
- Basant Chitara
- Department of Mechanical Engineering, Faculty of Engineering Sciences, Ben-Gurion University of the Negev, Israel.
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82
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Streppa L, Ratti F, Goillot E, Devin A, Schaeffer L, Arneodo A, Argoul F. Prestressed cells are prone to cytoskeleton failures under localized shear strain: an experimental demonstration on muscle precursor cells. Sci Rep 2018; 8:8602. [PMID: 29872100 PMCID: PMC5988700 DOI: 10.1038/s41598-018-26797-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Accepted: 05/14/2018] [Indexed: 12/24/2022] Open
Abstract
We report on a wavelet based space-scale decomposition method for analyzing the response of living muscle precursor cells (C2C12 myoblasts and myotubes) upon sharp indentation with an AFM cantilever and quantifying their aptitude to sustain such a local shear strain. Beyond global mechanical parameters which are currently used as markers of cell contractility, we emphasize the necessity of characterizing more closely the local fluctuations of the shear relaxation modulus as they carry important clues about the mechanisms of cytoskeleton strain release. Rupture events encountered during fixed velocity shear strain are interpreted as local disruptions of the actin cytoskeleton structures, the strongest (brittle) ones being produced by the tighter and stiffer stress fibers or actin agglomerates. These local strain induced failures are important characteristics of the resilience of these cells, and their aptitude to maintain their shape via a quick recovery from local strains. This study focuses on the perinuclear region because it can be considered as a master mechanical organizing center of these muscle precursor cells. Using this wavelet-based method, we combine the global and local approaches for a comparative analysis of the mechanical parameters of normal myoblasts, myotubes and myoblasts treated with actomyosin cytoskeleton disruptive agents (ATP depletion, blebbistatin).
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Affiliation(s)
- Laura Streppa
- Ecole Normale Supérieure de Lyon, CNRS, Laboratoire de Physique, UMR5672, F-69007, Lyon, France.,Université de Lyon 1, F-69100, Villeurbanne, France.,Ecole Normale Supérieure de Lyon, CNRS, LBMC, UMR5239, F-69007, Lyon, France
| | - Francesca Ratti
- Université de Lyon 1, F-69100, Villeurbanne, France.,Ecole Normale Supérieure de Lyon, CNRS, LBMC, UMR5239, F-69007, Lyon, France
| | - Evelyne Goillot
- Université de Lyon 1, F-69100, Villeurbanne, France.,Ecole Normale Supérieure de Lyon, CNRS, LBMC, UMR5239, F-69007, Lyon, France
| | - Anne Devin
- Université de Bordeaux, CNRS, IBGC, UMR5095, F-33077, Bordeaux, France
| | - Laurent Schaeffer
- Université de Lyon 1, F-69100, Villeurbanne, France.,Ecole Normale Supérieure de Lyon, CNRS, LBMC, UMR5239, F-69007, Lyon, France
| | - Alain Arneodo
- Ecole Normale Supérieure de Lyon, CNRS, Laboratoire de Physique, UMR5672, F-69007, Lyon, France.,Université de Lyon 1, F-69100, Villeurbanne, France.,Université de Bordeaux, CNRS, LOMA, UMR5798, F-33405, Talence, France
| | - Françoise Argoul
- Ecole Normale Supérieure de Lyon, CNRS, Laboratoire de Physique, UMR5672, F-69007, Lyon, France. .,Université de Lyon 1, F-69100, Villeurbanne, France. .,Université de Bordeaux, CNRS, LOMA, UMR5798, F-33405, Talence, France.
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83
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Fabrication of Micromolded Gelatin Hydrogels for Long-Term Culture of Aligned Skeletal Myotubes. Methods Mol Biol 2018; 1668:147-163. [PMID: 28842908 DOI: 10.1007/978-1-4939-7283-8_11] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
Abstract
Cultured skeletal myotubes are a powerful in vitro system for identifying mechanisms of skeletal muscle development and disease. However, skeletal myotubes routinely delaminate from conventional culture substrates after approximately 1 week, which significantly hampers their utility for in vitro disease modeling and drug screening. To address this problem, we fabricated micromolded gelatin hydrogels as culture substrates that are more biomimetic than conventional substrates. On micromolded gelatin hydrogels, C2C12 skeletal myoblasts align and differentiate into skeletal myotubes that are stable in culture for multiple weeks. With this protocol, we detail three key steps: (1) Fabrication of micromolded gelatin hydrogels; (2) Culture of mouse C2C12 myoblasts and differentiation into myotubes; and (3) Quantification of myotube morphology. These substrates have many applications for skeletal muscle disease modeling and drug screening over longer time scales.
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84
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Microenvironmental Modulation of Calcium Wave Propagation Velocity in Engineered Cardiac Tissues. Cell Mol Bioeng 2018; 11:337-352. [PMID: 31719889 DOI: 10.1007/s12195-018-0522-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Accepted: 04/09/2018] [Indexed: 10/17/2022] Open
Abstract
Introduction In the myocardium, rapid propagation of action potentials and subsequent calcium waves is critical for synchronizing the contraction of cardiac myocytes and maximizing cardiac output. In many pathological settings, diverse remodeling of the tissue microenvironment is correlated with arrhythmias and decreased cardiac output, but the precise impact of tissue remodeling on propagation is not completely understood. Our objective was to delineate how multiple features within the cardiac tissue microenvironment modulate propagation velocity. Methods To recapitulate diverse myocardial tissue microenvironments, we engineered substrates with tunable elasticity, patterning, composition, and topography using two formulations of polydimethylsiloxane (PDMS) micropatterned with fibronectin and gelatin hydrogels with flat or micromolded features. We cultured neonatal rat ventricular myocytes on these substrates and quantified cell density, tissue alignment, and cell shape. We used a fluorescent calcium indicator, high-speed microscopy, and newly-developed analysis software to record and quantify calcium wave propagation velocity (CPV). Results For all substrates, tissue alignment and cell aspect ratio were higher in aligned compared to isotropic tissues. Isotropic CPV and longitudinal CPV were similar across conditions, but transverse CPV was lower on micromolded gelatin hydrogels compared to micropatterned soft and stiff PDMS. In aligned tissues, the anisotropy ratio of CPV (longitudinal CPV/transverse CPV) was lower on micropatterned soft PDMS compared to micropatterned stiff PDMS and micromolded gelatin hydrogels. Conclusion Propagation velocity in engineered cardiac tissues is sensitive to features in the tissue microenvironment, such as alignment, matrix elasticity, and matrix topography, which may underlie arrhythmias in conditions with pathological tissue remodeling.
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Moreno-Ulloa A, Miranda-Cervantes A, Licea-Navarro A, Mansour C, Beltrán-Partida E, Donis-Maturano L, Delgado De la Herrán HC, Villarreal F, Álvarez-Delgado C. (-)-Epicatechin stimulates mitochondrial biogenesis and cell growth in C2C12 myotubes via the G-protein coupled estrogen receptor. Eur J Pharmacol 2018; 822:95-107. [PMID: 29355558 PMCID: PMC5809192 DOI: 10.1016/j.ejphar.2018.01.014] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 01/08/2018] [Accepted: 01/15/2018] [Indexed: 01/24/2023]
Abstract
We have reported on the capacity of (-)-epicatechin ((-)-EPI) to stimulate mitochondrial biogenesis (MiB) in mouse skeletal muscle (SkM). However, the mechanisms mediating the effects of (-)-EPI are not fully understood. We previously identified a role of the G-protein coupled estrogen receptor (GPER) in modulating the vascular effects of (-)-EPI. We therefore tested the hypothesis that GPER mediates (at least in part) the stimulatory effects of (-)-EPI on MiB in SkM cells. As an in vitro model, we employed mouse SkM-derived C2C12 myoblasts differentiated into myotubes. Using confocal microscopy, we detected GPER at the cell surface and cytoplasm in C2C12 myotubes. Treatment with (-)-EPI (3 and 10μM) resulted in the stimulation of MiB as per increases in mitochondrial inner (MitoTracker Red FM fluorescence staining) and outer membrane (porin protein levels) markers, transcription factors involved in MiB stimulation (i.e., nuclear respiratory factor-2 [NRF-2] and mitochondrial transcription factor A [TFAM] protein levels) and citrate synthase (CS) activity levels. (-)-EPI-treated myotubes were longer and wider compared to vehicle-treated myotubes. The effects of (-)-EPI on myotube mitochondria and cell size were larger in magnitude to those observed with the GPER agonist G-1. The chemical blockade and down-regulation (siRNA) of GPER evidenced a partial and complete blockade of measured endpoints following (-)-EPI- or G-1-treatment, respectively. Altogether, results indicate that GPER is expressed in muscle cells and appears to mediate to a significant extent, the stimulatory effects of (-)-EPI on MiB. Thus, GPER activation may account for the stimulatory effects of (-)-EPI on SkM structure/function.
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Affiliation(s)
- Aldo Moreno-Ulloa
- Departamento de Innovación Biomédica, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Baja California, México
| | - Adriana Miranda-Cervantes
- Departamento de Innovación Biomédica, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Baja California, México
| | - Alexei Licea-Navarro
- Departamento de Innovación Biomédica, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Baja California, México
| | | | | | - Luis Donis-Maturano
- Departamento de Innovación Biomédica, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Baja California, México
| | - Hilda C Delgado De la Herrán
- Departamento de Innovación Biomédica, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Baja California, México
| | | | - Carolina Álvarez-Delgado
- Departamento de Innovación Biomédica, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Baja California, México.
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86
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Cho N, Razipour SE, McCain ML. Featured Article: TGF-β1 dominates extracellular matrix rigidity for inducing differentiation of human cardiac fibroblasts to myofibroblasts. Exp Biol Med (Maywood) 2018; 243:601-612. [PMID: 29504479 DOI: 10.1177/1535370218761628] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Cardiac fibroblasts and their activated derivatives, myofibroblasts, play a critical role in wound healing after myocardial injury and often contribute to long-term pathological outcomes, such as excessive fibrosis. Thus, defining the microenvironmental factors that regulate the phenotype of cardiac fibroblasts and myofibroblasts could lead to new therapeutic strategies. Both chemical and biomechanical cues have previously been shown to induce myofibroblast differentiation in many organs and species. For example, transforming growth factor beta 1, a cytokine secreted by neutrophils, and rigid extracellular matrix environments have both been shown to promote differentiation. However, the relative contributions of transforming growth factor beta 1 and extracellular matrix rigidity, two hallmark cues in many pathological myocardial microenvironments, to the phenotype of human cardiac fibroblasts are unclear. We hypothesized that transforming growth factor beta 1 and rigid extracellular matrix environments would potentially have a synergistic effect on the differentiation of human cardiac fibroblasts to myofibroblasts. To test this, we seeded primary human adult cardiac fibroblasts onto coverslips coated with polydimethylsiloxane of various elastic moduli, introduced transforming growth factor beta 1, and longitudinally quantified cell phenotype by measuring expression of α-smooth muscle actin, the most robust indicator of myofibroblasts. Our data indicate that, although extracellular matrix rigidity influenced differentiation after one day of transforming growth factor beta 1 treatment, ultimately transforming growth factor beta 1 superseded extracellular matrix rigidity as the primary regulator of myofibroblast differentiation. We also measured expression of POSTN, FAP, and FSP1, proposed secondary indicators of fibroblast/myofibroblast phenotypes. Although these genes partially trended with α-smooth muscle actin expression, they were relatively inconsistent. Finally, we demonstrated that activated myofibroblasts incompletely revert to a fibroblast phenotype after they are re-plated onto new surfaces without transforming growth factor beta 1, suggesting differentiation is partially reversible. Our results provide new insights into how microenvironmental cues affect human cardiac fibroblast differentiation in the context of myocardial pathology, which is important for identifying effective therapeutic targets and dictating supporting cell phenotypes for engineered human cardiac disease models. Impact statement Heart disease is the leading cause of death worldwide. Many forms of heart disease are associated with fibrosis, which increases extracellular matrix (ECM) rigidity and compromises cardiac output. Fibrotic tissue is synthesized primarily by myofibroblasts differentiated from fibroblasts. Thus, defining the cues that regulate myofibroblast differentiation is important for understanding the mechanisms of fibrosis. However, previous studies have focused on non-human cardiac fibroblasts and have not tested combinations of chemical and mechanical cues. We tested the effects of TGF-β1, a cytokine secreted by immune cells after injury, and ECM rigidity on the differentiation of human cardiac fibroblasts to myofibroblasts. Our results indicate that differentiation is initially influenced by ECM rigidity, but is ultimately superseded by TGF-β1. This suggests that targeting TGF-β signaling pathways in cardiac fibroblasts may have therapeutic potential for attenuating fibrosis, even in rigid microenvironments. Additionally, our approach can be leveraged to engineer more precise multi-cellular human cardiac tissue models.
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Affiliation(s)
- Nathan Cho
- 1 Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles, CA 90089, USA
| | - Shadi E Razipour
- 1 Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles, CA 90089, USA
| | - Megan L McCain
- 1 Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles, CA 90089, USA.,2 Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA 90033, USA
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87
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Sapoznik E, Niu G, Zhou Y, Prim PM, Criswell TL, Soker S. A real-time monitoring platform of myogenesis regulators using double fluorescent labeling. PLoS One 2018; 13:e0192654. [PMID: 29444187 PMCID: PMC5812636 DOI: 10.1371/journal.pone.0192654] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 01/26/2018] [Indexed: 11/18/2022] Open
Abstract
Real-time, quantitative measurement of muscle progenitor cell (myoblast) differentiation is an important tool for skeletal muscle research and identification of drugs that support skeletal muscle regeneration. While most quantitative tools rely on sacrificial approach, we developed a double fluorescent tagging approach, which allows for dynamic monitoring of myoblast differentiation through assessment of fusion index and nuclei count. Fluorescent tagging of both the cell cytoplasm and nucleus enables monitoring of cell fusion and the formation of new myotube fibers, similar to immunostaining results. This labeling approach allowed monitoring the effects of Myf5 overexpression, TNFα, and Wnt agonist on myoblast differentiation. It also enabled testing the effects of surface coating on the fusion levels of scaffold-seeded myoblasts. The double fluorescent labeling of myoblasts is a promising technique to visualize even minor changes in myogenesis of myoblasts in order to support applications such as tissue engineering and drug screening.
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Affiliation(s)
- Etai Sapoznik
- Wake Forest Institute for Regenerative Medicine, Winston Salem, North Carolina, United States of America
| | - Guoguang Niu
- Wake Forest Institute for Regenerative Medicine, Winston Salem, North Carolina, United States of America
| | - Yu Zhou
- Wake Forest Institute for Regenerative Medicine, Winston Salem, North Carolina, United States of America
| | - Peter M. Prim
- Wake Forest Institute for Regenerative Medicine, Winston Salem, North Carolina, United States of America
| | - Tracy L. Criswell
- Wake Forest Institute for Regenerative Medicine, Winston Salem, North Carolina, United States of America
| | - Shay Soker
- Wake Forest Institute for Regenerative Medicine, Winston Salem, North Carolina, United States of America
- * E-mail:
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88
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Gattazzo F, De Maria C, Rimessi A, Donà S, Braghetta P, Pinton P, Vozzi G, Bonaldo P. Gelatin-genipin-based biomaterials for skeletal muscle tissue engineering. J Biomed Mater Res B Appl Biomater 2018; 106:2763-2777. [PMID: 29412500 DOI: 10.1002/jbm.b.34057] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Revised: 11/14/2017] [Accepted: 11/18/2017] [Indexed: 01/03/2023]
Abstract
Skeletal muscle engineering aims at tissue reconstruction to replace muscle loss following traumatic injury or in congenital muscle defects. Skeletal muscle can be engineered by using biodegradable and biocompatible scaffolds that favor myogenic cell adhesion and subsequent tissue organization. In this study, we characterized scaffolds made of gelatin cross-linked with genipin, a natural derived cross-linking agent with low cytotoxicity and high biocompatibility, for tissue engineering of skeletal muscle. We generated gelatin-genipin hydrogels with a stiffness of 13 kPa to reproduce the mechanical properties characteristic of skeletal muscle and we show that their surface can be topographically patterned through soft lithography to drive myogenic cells differentiation and unidirectional orientation. Furthermore, we demonstrate that these biomaterials can be successfully implanted in vivo under dorsal mouse skin, showing good biocompatibility and slow biodegradation rate. Moreover, the grafting of this biomaterial in partially ablated tibialis anterior muscle does not impair muscle regeneration, supporting future applications of gelatin-genipin biomaterials in the field of skeletal muscle tissue repair. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 2763-2777, 2018.
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Affiliation(s)
- Francesca Gattazzo
- Department of Molecular Medicine, University of Padova, Padova, 35131, Italy.,Research Center "E. Piaggio," University of Pisa, Pisa, 56122, Italy
| | - Carmelo De Maria
- Research Center "E. Piaggio," University of Pisa, Pisa, 56122, Italy
| | - Alessandro Rimessi
- Department of Morphology, Surgery and Experimental Medicine, University of Ferrara, Ferrara, 44121, Italy
| | - Silvia Donà
- Department of Molecular Medicine, University of Padova, Padova, 35131, Italy
| | - Paola Braghetta
- Department of Molecular Medicine, University of Padova, Padova, 35131, Italy
| | - Paolo Pinton
- Department of Morphology, Surgery and Experimental Medicine, University of Ferrara, Ferrara, 44121, Italy
| | - Giovanni Vozzi
- Research Center "E. Piaggio," University of Pisa, Pisa, 56122, Italy
| | - Paolo Bonaldo
- Department of Molecular Medicine, University of Padova, Padova, 35131, Italy.,CRIBI Biotechnology Center, University of Padova, Padova, 35131, Italy
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89
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Nawroth JC, Scudder LL, Halvorson RT, Tresback J, Ferrier JP, Sheehy SP, Cho A, Kannan S, Sunyovszki I, Goss JA, Campbell PH, Parker KK. Automated fabrication of photopatterned gelatin hydrogels for organ-on-chips applications. Biofabrication 2018; 10:025004. [PMID: 29337695 PMCID: PMC6221195 DOI: 10.1088/1758-5090/aa96de] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Organ-on-chip platforms aim to improve preclinical models for organ-level responses to novel drug compounds. Heart-on-a-chip assays in particular require tissue engineering techniques that rely on labor-intensive photolithographic fabrication or resolution-limited 3D printing of micropatterned substrates, which limits turnover and flexibility of prototyping. We present a rapid and automated method for large scale on-demand micropatterning of gelatin hydrogels for organ-on-chip applications using a novel biocompatible laser-etching approach. Fast and automated micropatterning is achieved via photosensitization of gelatin using riboflavin-5'phosphate followed by UV laser-mediated photoablation of the gel surface in user-defined patterns only limited by the resolution of the 15 μm wide laser focal point. Using this photopatterning approach, we generated microscale surface groove and pillar structures with feature dimensions on the order of 10-30 μm. The standard deviation of feature height was 0.3 μm, demonstrating robustness and reproducibility. Importantly, the UV-patterning process is non-destructive and does not alter gelatin micromechanical properties. Furthermore, as a quality control step, UV-patterned heart chip substrates were seeded with rat or human cardiac myocytes, and we verified that the resulting cardiac tissues achieved structural organization, contractile function, and long-term viability comparable to manually patterned gelatin substrates. Start-to-finish, UV-patterning shortened the time required to design and manufacture micropatterned gelatin substrates for heart-on-chip applications by up to 60% compared to traditional lithography-based approaches, providing an important technological advance enroute to automated and continuous manufacturing of organ-on-chips.
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Affiliation(s)
- Janna C. Nawroth
- Disease Biophysics Group, Wyss Institute for Biologically Inspired Engineering, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Lisa L. Scudder
- Disease Biophysics Group, Wyss Institute for Biologically Inspired Engineering, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Ryan T. Halvorson
- Disease Biophysics Group, Wyss Institute for Biologically Inspired Engineering, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Jason Tresback
- Center for Nanoscale Systems, Harvard University, Cambridge, MA, USA
| | - John P. Ferrier
- Disease Biophysics Group, Wyss Institute for Biologically Inspired Engineering, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Sean P. Sheehy
- Disease Biophysics Group, Wyss Institute for Biologically Inspired Engineering, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Alex Cho
- Disease Biophysics Group, Wyss Institute for Biologically Inspired Engineering, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Suraj Kannan
- Disease Biophysics Group, Wyss Institute for Biologically Inspired Engineering, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Ilona Sunyovszki
- Disease Biophysics Group, Wyss Institute for Biologically Inspired Engineering, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Josue A. Goss
- Disease Biophysics Group, Wyss Institute for Biologically Inspired Engineering, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Patrick H. Campbell
- Disease Biophysics Group, Wyss Institute for Biologically Inspired Engineering, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Kevin Kit Parker
- Disease Biophysics Group, Wyss Institute for Biologically Inspired Engineering, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
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90
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Bandyopadhyay A, Dewangan VK, Vajanthri KY, Poddar S, Mahto SK. Easy and affordable method for rapid prototyping of tissue models in vitro using three-dimensional bioprinting. Biocybern Biomed Eng 2018. [DOI: 10.1016/j.bbe.2017.12.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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91
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Huang G, Li F, Zhao X, Ma Y, Li Y, Lin M, Jin G, Lu TJ, Genin GM, Xu F. Functional and Biomimetic Materials for Engineering of the Three-Dimensional Cell Microenvironment. Chem Rev 2017; 117:12764-12850. [PMID: 28991456 PMCID: PMC6494624 DOI: 10.1021/acs.chemrev.7b00094] [Citation(s) in RCA: 469] [Impact Index Per Article: 67.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The cell microenvironment has emerged as a key determinant of cell behavior and function in development, physiology, and pathophysiology. The extracellular matrix (ECM) within the cell microenvironment serves not only as a structural foundation for cells but also as a source of three-dimensional (3D) biochemical and biophysical cues that trigger and regulate cell behaviors. Increasing evidence suggests that the 3D character of the microenvironment is required for development of many critical cell responses observed in vivo, fueling a surge in the development of functional and biomimetic materials for engineering the 3D cell microenvironment. Progress in the design of such materials has improved control of cell behaviors in 3D and advanced the fields of tissue regeneration, in vitro tissue models, large-scale cell differentiation, immunotherapy, and gene therapy. However, the field is still in its infancy, and discoveries about the nature of cell-microenvironment interactions continue to overturn much early progress in the field. Key challenges continue to be dissecting the roles of chemistry, structure, mechanics, and electrophysiology in the cell microenvironment, and understanding and harnessing the roles of periodicity and drift in these factors. This review encapsulates where recent advances appear to leave the ever-shifting state of the art, and it highlights areas in which substantial potential and uncertainty remain.
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Affiliation(s)
- Guoyou Huang
- MOE Key Laboratory of Biomedical Information
Engineering, School of Life Science and Technology, Xi’an Jiaotong
University, Xi’an 710049, People’s Republic of China
- Bioinspired Engineering and Biomechanics Center
(BEBC), Xi’an Jiaotong University, Xi’an 710049, People’s
Republic of China
| | - Fei Li
- Bioinspired Engineering and Biomechanics Center
(BEBC), Xi’an Jiaotong University, Xi’an 710049, People’s
Republic of China
- Department of Chemistry, School of Science,
Xi’an Jiaotong University, Xi’an 710049, People’s Republic
of China
| | - Xin Zhao
- Bioinspired Engineering and Biomechanics Center
(BEBC), Xi’an Jiaotong University, Xi’an 710049, People’s
Republic of China
- Interdisciplinary Division of Biomedical
Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong,
People’s Republic of China
| | - Yufei Ma
- MOE Key Laboratory of Biomedical Information
Engineering, School of Life Science and Technology, Xi’an Jiaotong
University, Xi’an 710049, People’s Republic of China
- Bioinspired Engineering and Biomechanics Center
(BEBC), Xi’an Jiaotong University, Xi’an 710049, People’s
Republic of China
| | - Yuhui Li
- MOE Key Laboratory of Biomedical Information
Engineering, School of Life Science and Technology, Xi’an Jiaotong
University, Xi’an 710049, People’s Republic of China
- Bioinspired Engineering and Biomechanics Center
(BEBC), Xi’an Jiaotong University, Xi’an 710049, People’s
Republic of China
| | - Min Lin
- MOE Key Laboratory of Biomedical Information
Engineering, School of Life Science and Technology, Xi’an Jiaotong
University, Xi’an 710049, People’s Republic of China
- Bioinspired Engineering and Biomechanics Center
(BEBC), Xi’an Jiaotong University, Xi’an 710049, People’s
Republic of China
| | - Guorui Jin
- MOE Key Laboratory of Biomedical Information
Engineering, School of Life Science and Technology, Xi’an Jiaotong
University, Xi’an 710049, People’s Republic of China
- Bioinspired Engineering and Biomechanics Center
(BEBC), Xi’an Jiaotong University, Xi’an 710049, People’s
Republic of China
| | - Tian Jian Lu
- Bioinspired Engineering and Biomechanics Center
(BEBC), Xi’an Jiaotong University, Xi’an 710049, People’s
Republic of China
- MOE Key Laboratory for Multifunctional Materials
and Structures, Xi’an Jiaotong University, Xi’an 710049,
People’s Republic of China
| | - Guy M. Genin
- MOE Key Laboratory of Biomedical Information
Engineering, School of Life Science and Technology, Xi’an Jiaotong
University, Xi’an 710049, People’s Republic of China
- Bioinspired Engineering and Biomechanics Center
(BEBC), Xi’an Jiaotong University, Xi’an 710049, People’s
Republic of China
- Department of Mechanical Engineering &
Materials Science, Washington University in St. Louis, St. Louis 63130, MO,
USA
- NSF Science and Technology Center for
Engineering MechanoBiology, Washington University in St. Louis, St. Louis 63130,
MO, USA
| | - Feng Xu
- MOE Key Laboratory of Biomedical Information
Engineering, School of Life Science and Technology, Xi’an Jiaotong
University, Xi’an 710049, People’s Republic of China
- Bioinspired Engineering and Biomechanics Center
(BEBC), Xi’an Jiaotong University, Xi’an 710049, People’s
Republic of China
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92
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Laumonier T, Koenig S, Saüc S, Frieden M. Isolation of Human Myoblasts, Assessment of Myogenic Differentiation, and Store-operated Calcium Entry Measurement. J Vis Exp 2017. [PMID: 28784949 DOI: 10.3791/55918] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Satellite cells (SC) are muscle stem cells located between the plasma membrane of muscle fibers and the surrounding basal lamina. They are essential for muscle regeneration. Upon injury, which occurs frequently in skeletal muscles, SCs are activated. They proliferate as myoblasts and differentiate to repair muscle lesions. Among many events that take place during muscle differentiation, cytosolic Ca2+ signals are of great importance. These Ca2+ signals arise from Ca2+ release from internal Ca2+ stores, as well as from Ca2+ entry from the extracellular space, particularly the store-operated Ca2+ entry (SOCE). This paper describes a methodology used to obtain a pure population of human myoblasts from muscle samples collected after orthopedic surgery. The tissue is mechanically and enzymatically digested, and the cells are amplified and then sorted by flow cytometry according to the presence of specific membrane markers. Once obtained, human myoblasts are expanded and committed to differentiate by removing growth factors from the culture medium. The expression levels of specific transcription factors and in vitro immunofluorescence are used to assess the myogenic differentiation process in control conditions and after silencing proteins involved in Ca2+ signaling. Finally, we detail the use of Fura-2 as a ratiometric Ca2+ probe that provides reliable and reproducible measurements of SOCE.
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Affiliation(s)
- Thomas Laumonier
- Department of Orthopedic Surgery, Geneva University Hospitals & Faculty of Medicine
| | | | - Sophie Saüc
- Department of Basic Neurosciences, Geneva Medical Center; Department of Cell Physiology and Metabolism, Geneva Medical Center
| | - Maud Frieden
- Department of Cell Physiology and Metabolism, Geneva Medical Center;
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93
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Lyra-Leite DM, Andres AM, Petersen AP, Ariyasinghe NR, Cho N, Lee JA, Gottlieb RA, McCain ML. Mitochondrial function in engineered cardiac tissues is regulated by extracellular matrix elasticity and tissue alignment. Am J Physiol Heart Circ Physiol 2017; 313:H757-H767. [PMID: 28733449 DOI: 10.1152/ajpheart.00290.2017] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 06/29/2017] [Accepted: 07/16/2017] [Indexed: 01/20/2023]
Abstract
Mitochondria in cardiac myocytes are critical for generating ATP to meet the high metabolic demands associated with sarcomere shortening. Distinct remodeling of mitochondrial structure and function occur in cardiac myocytes in both developmental and pathological settings. However, the factors that underlie these changes are poorly understood. Because remodeling of tissue architecture and extracellular matrix (ECM) elasticity are also hallmarks of ventricular development and disease, we hypothesize that these environmental factors regulate mitochondrial function in cardiac myocytes. To test this, we developed a new procedure to transfer tunable polydimethylsiloxane disks microcontact-printed with fibronectin into cell culture microplates. We cultured Sprague-Dawley neonatal rat ventricular myocytes within the wells, which consistently formed tissues following the printed fibronectin, and measured oxygen consumption rate using a Seahorse extracellular flux analyzer. Our data indicate that parameters associated with baseline metabolism are predominantly regulated by ECM elasticity, whereas the ability of tissues to adapt to metabolic stress is regulated by both ECM elasticity and tissue alignment. Furthermore, bioenergetic health index, which reflects both the positive and negative aspects of oxygen consumption, was highest in aligned tissues on the most rigid substrate, suggesting that overall mitochondrial function is regulated by both ECM elasticity and tissue alignment. Our results demonstrate that mitochondrial function is regulated by both ECM elasticity and myofibril architecture in cardiac myocytes. This provides novel insight into how extracellular cues impact mitochondrial function in the context of cardiac development and disease.NEW & NOTEWORTHY A new methodology has been developed to measure O2 consumption rates in engineered cardiac tissues with independent control over tissue alignment and matrix elasticity. This led to the findings that matrix elasticity regulates basal mitochondrial function, whereas both matrix elasticity and tissue alignment regulate mitochondrial stress responses.
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Affiliation(s)
- Davi M Lyra-Leite
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles, California
| | - Allen M Andres
- Heart Institute and Barbra Streisand Women's Heart Center, Cedars-Sinai Medical Center, Los Angeles, California; and
| | - Andrew P Petersen
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles, California
| | - Nethika R Ariyasinghe
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles, California
| | - Nathan Cho
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles, California
| | - Jezell A Lee
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles, California
| | - Roberta A Gottlieb
- Heart Institute and Barbra Streisand Women's Heart Center, Cedars-Sinai Medical Center, Los Angeles, California; and
| | - Megan L McCain
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles, California; .,Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine of USC, University of Southern California, Los Angeles, California
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94
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Sanzari I, Callisti M, Grazia AD, Evans DJ, Polcar T, Prodromakis T. Parylene C topographic micropattern as a template for patterning PDMS and Polyacrylamide hydrogel. Sci Rep 2017; 7:5764. [PMID: 28720761 PMCID: PMC5516021 DOI: 10.1038/s41598-017-05434-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 06/16/2017] [Indexed: 11/09/2022] Open
Abstract
Parylene C is a well-known polymer and it has been mainly employed as a protective layer for implantable electronics. In this paper, we propose a new approach to use Parylene C as a versatile template for patterning soft materials potentially applicable as scaffolds in cardiac tissue engineering (TE). Parylene C substrates were anisotropically patterned through standard lithographic process with hydrophilic channels separating raised hydrophobic strips. Ridges and grooves of the template are 10 µm width and depth ranging from 1 to 17 µm. Polydimethylsiloxane (PDMS) and Polyacrylamide (PAm) hydrogel have been chosen as soft polymers to be moulded. Thanks to their chemical and physical properties PDMS and PAm hydrogel mimic the extracellular matrix (ECM). PDMS was spin coated on micropatterned Parylene C obtaining composite substrates with 460 nm and 1.15 µm high grooves. The Young's modulus of the composite Parylene C/PDMS was evaluated and it was found to be almost half when compared to PDMS. PAm hydrogel was also printed using collagen coated micro-grooved Parylene C. Optical micrographs and fluorescence analysis show the successful topographic and protein pattern transfer on the hydrogel.
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Affiliation(s)
- Ilaria Sanzari
- Nanoelectronics & Nanotechnology Research Group, Department of Electronics and Computer Science, Faculty of Physical Science and Engineering, University of Southampton, University Road, Southampton, SO17 1BJ, United Kingdom. .,Department of Electronics and Computer Science, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, United Kingdom.
| | - Mauro Callisti
- Engineering Science, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, United Kingdom
| | - Antonio De Grazia
- Department of Electronics and Computer Science, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, United Kingdom
| | - Daniel J Evans
- Nanoelectronics & Nanotechnology Research Group, Department of Electronics and Computer Science, Faculty of Physical Science and Engineering, University of Southampton, University Road, Southampton, SO17 1BJ, United Kingdom.,Department of Electronics and Computer Science, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, United Kingdom
| | - Tomas Polcar
- Engineering Science, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, United Kingdom
| | - Themistoklis Prodromakis
- Nanoelectronics & Nanotechnology Research Group, Department of Electronics and Computer Science, Faculty of Physical Science and Engineering, University of Southampton, University Road, Southampton, SO17 1BJ, United Kingdom.,Department of Electronics and Computer Science, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, United Kingdom
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95
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Happe CL, Tenerelli KP, Gromova AK, Kolb F, Engler AJ. Mechanically patterned neuromuscular junctions-in-a-dish have improved functional maturation. Mol Biol Cell 2017; 28:1950-1958. [PMID: 28495800 PMCID: PMC5541845 DOI: 10.1091/mbc.e17-01-0046] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Revised: 04/03/2017] [Accepted: 05/02/2017] [Indexed: 12/11/2022] Open
Abstract
Motor neuron (MN) diseases are progressive disorders resulting from degeneration of neuromuscular junctions (NMJs), which form the connection between MNs and muscle fibers. NMJ-in-a-dish models have been developed to examine human MN-associated dysfunction with disease; however such coculture models have randomly oriented myotubes with immature synapses that contract asynchronously. Mechanically patterned (MP) extracellular matrix with alternating soft and stiff stripes improves current NMJ-in-a-dish models by inducing both mouse and human myoblast durotaxis to stripes where they aligned, differentiated, and fused into patterned myotubes. Compared to conventional culture on rigid substrates or unpatterned hydrogels, MP substrates supported increased differentiation and fusion, significantly larger acetylcholine (ACh) receptor clusters, and increased expression of MuSK and Lrp4, two cell surface receptors required for NMJ formation. Robust contractions were observed when mouse myotubes were stimulated by ACh, with twitch duration and frequency most closely resembling those for mature muscle on MP substrates. Fused myotubes, when cocultured with MNs, were able to form even larger NMJs. Thus MP matrices produce more functionally active NMJs-in-a-dish, which could be used to elucidate disease pathology and facilitate drug discovery.
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Affiliation(s)
- Cassandra L Happe
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093
| | - Kevin P Tenerelli
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093
| | - Anastasia K Gromova
- Biomedical Sciences Program, University of California, San Diego, La Jolla, CA 92093
| | - Frederic Kolb
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093
| | - Adam J Engler
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093
- Biomedical Sciences Program, University of California, San Diego, La Jolla, CA 92093
- Sanford Consortium for Regenerative Medicine, La Jolla, CA 92037
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96
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Stewart DC, Rubiano A, Dyson K, Simmons CS. Mechanical characterization of human brain tumors from patients and comparison to potential surgical phantoms. PLoS One 2017; 12:e0177561. [PMID: 28582392 PMCID: PMC5459328 DOI: 10.1371/journal.pone.0177561] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Accepted: 04/28/2017] [Indexed: 11/30/2022] Open
Abstract
While mechanical properties of the brain have been investigated thoroughly, the mechanical properties of human brain tumors rarely have been directly quantified due to the complexities of acquiring human tissue. Quantifying the mechanical properties of brain tumors is a necessary prerequisite, though, to identify appropriate materials for surgical tool testing and to define target parameters for cell biology and tissue engineering applications. Since characterization methods vary widely for soft biological and synthetic materials, here, we have developed a characterization method compatible with abnormally shaped human brain tumors, mouse tumors, animal tissue and common hydrogels, which enables direct comparison among samples. Samples were tested using a custom-built millimeter-scale indenter, and resulting force-displacement data is analyzed to quantify the steady-state modulus of each sample. We have directly quantified the quasi-static mechanical properties of human brain tumors with effective moduli ranging from 0.17–16.06 kPa for various pathologies. Of the readily available and inexpensive animal tissues tested, chicken liver (steady-state modulus 0.44 ± 0.13 kPa) has similar mechanical properties to normal human brain tissue while chicken crassus gizzard muscle (steady-state modulus 3.00 ± 0.65 kPa) has similar mechanical properties to human brain tumors. Other materials frequently used to mimic brain tissue in mechanical tests, like ballistic gel and chicken breast, were found to be significantly stiffer than both normal and diseased brain tissue. We have directly compared quasi-static properties of brain tissue, brain tumors, and common mechanical surrogates, though additional tests would be required to determine more complex constitutive models.
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Affiliation(s)
- Daniel C. Stewart
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, Florida, United States of America
| | - Andrés Rubiano
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida, United States of America
| | - Kyle Dyson
- Lillian S. Wells Department of Neurosurgery, University of Florida, Gainesville, Florida, United States of America
| | - Chelsey S. Simmons
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, Florida, United States of America
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida, United States of America
- Division of Cardiovascular Medicine, University of Florida, Gainesville, Florida, United States of America
- * E-mail:
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97
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Cha SH, Lee HJ, Koh WG. Study of myoblast differentiation using multi-dimensional scaffolds consisting of nano and micropatterns. Biomater Res 2017; 21:1. [PMID: 28097017 PMCID: PMC5225639 DOI: 10.1186/s40824-016-0087-x] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 12/16/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The topographical cue is major influence on skeletal muscle cell culture because the structure is highly organized and consists of long parallel bundles of multinucleated myotubes that are formed by differentiation and fusion of myoblast satellite cells. In this technical report, we fabricated a multiscale scaffold using electrospinning and poly (ethylene glycol) (PEG) hydrogel micropatterns to monitor the cell behaviors on nano- and micro-alignment combined scaffolds with different combinations of angles. RESULTS We fabricated multiscale scaffolds that provide biocompatible and extracellular matrix (ECM)-mimetic environments via electrospun nanofiber and PEG hydrogel micro patterning. MTT assays demonstrated an almost four-fold increase in the proliferation rate during the 7 days of cell culture for all of the experimental groups. Cell orientation and elongation were measured to confirm the myogenic potential. On the aligned fibrous scaffolds, more than 90% of the cells were dispersed ± 20° of the fiber orientation. To determine cell elongation, we monitored nuclei aspect ratios. On a random nanofiber, the cells demonstrated an aspect ratio of 1.33, but on perpendicular and parallel nanofibers, the aspect ratio was greater than 2. Myosin heavy chain (MHC) expression was significantly higher i) on parallel compared to random fibers, ii) the 100 μm compared to the 200 μm line pattern. We confirmed the disparate trends of myotube formation that can be provoked through multi-dimensional scaffolds. CONCLUSION We studied more favorable environments that induce cell alignment and elongation for myogenesis by combining nano- and micro-scale patterns. The fabricated system can serve as a novel multi-dimensional platform to study in vitro cell behaviors.
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Affiliation(s)
- Sung Ho Cha
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-749 South Korea
| | - Hyun Jong Lee
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-749 South Korea
| | - Won-Gun Koh
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-749 South Korea
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