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Li Y, Huang J, Chen Y, Zhu S, Huang Z, Yang L, Li G. Nerve function restoration following targeted muscle reinnervation after varying delayed periods. Neural Regen Res 2023; 18:2762-2766. [PMID: 37449642 DOI: 10.4103/1673-5374.373659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/18/2023] Open
Abstract
Targeted muscle reinnervation has been proposed for reconstruction of neuromuscular function in amputees. However, it is unknown whether performing delayed targeted muscle reinnervation after nerve injury will affect restoration of function. In this rat nerve injury study, the median and musculocutaneous nerves of the forelimb were transected. The proximal median nerve stump was sutured to the distal musculocutaneous nerve stump immediately and 2 and 4 weeks after surgery to reinnervate the biceps brachii. After targeted muscle reinnervation, intramuscular myoelectric signals from the biceps brachii were recorded. Signal amplitude gradually increased with time. Biceps brachii myoelectric signals and muscle fiber morphology and grooming behavior did not significantly differ among rats subjected to delayed target muscle innervation for different periods. Targeted muscle reinnervation delayed for 4 weeks can acquire the same nerve function restoration effect as that of immediate reinnervation.
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Affiliation(s)
- Yuanheng Li
- Key Laboratory of Human-Machine Intelligence-Synergy Systems and Branch of Shenzhen Institute of Artificial Intelligence and Robotics for Society, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong Province, China
| | - Jiangping Huang
- Key Laboratory of Human-Machine Intelligence-Synergy Systems and Branch of Shenzhen Institute of Artificial Intelligence and Robotics for Society, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong Province, China
| | - Yuling Chen
- Department of Rehabilitation Medicine, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong Province; Department of Rehabilitation Medicine, Yibin Hospital of Traditional Chinese Medicine, Yibin, Sichuan Province, China
| | - Shanshan Zhu
- Key Laboratory of Human-Machine Intelligence-Synergy Systems and Branch of Shenzhen Institute of Artificial Intelligence and Robotics for Society, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong Province, China
| | - Zhen Huang
- Department of Rehabilitation Medicine, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong Province; Department of Rehabilitation Medicine, Yibin Hospital of Traditional Chinese Medicine, Yibin, Sichuan Province, China
| | - Lin Yang
- Key Laboratory of Human-Machine Intelligence-Synergy Systems and Branch of Shenzhen Institute of Artificial Intelligence and Robotics for Society, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong Province, China
| | - Guanglin Li
- Key Laboratory of Human-Machine Intelligence-Synergy Systems and Branch of Shenzhen Institute of Artificial Intelligence and Robotics for Society, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong Province, China
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Li K, Zhu Y, Zhang Q, Shi Y, Yan T, Lu X, Sun H, Li T, Li Z, Shi X, Han D. Interstitial Injection of Hydrogels with High-Mechanical Conductivity Relieves Muscle Atrophy Induced by Nerve Injury. Adv Healthc Mater 2023; 12:e2202707. [PMID: 37409443 DOI: 10.1002/adhm.202202707] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 06/13/2023] [Accepted: 06/24/2023] [Indexed: 07/07/2023]
Abstract
Injectable hydrogels have been extensively used in tissue engineering where high mechanical properties are key for their functionality at sites of high physiological stress. In this study, an injectable, conductive hydrogel is developed exhibiting remarkable mechanical strength that can withstand a pressure of 500 kPa (85% deformation rate) and display good fatigue resistance, electrical conductivity, and tissue adhesion. A stable covalent cross-linked network with a slip-ring structure by threading amino β-cyclodextrin is formed onto the chain of a four-armed (polyethylene glycol) amino group, and then reacted with the four-armed (polyethylene glycol) maleimide under physiological conditions. The addition of silver nanowires enhances the hydrogel's electrical conductivity, enabling it to act as a good conductor in vivo. The hydrogel is injected into the fascial space, and the results show that the weight and muscle tone of the atrophied gastrocnemius muscle improve, subsequently alleviating muscle atrophy. Overall, this study provides a simple method for the preparation of a conductive hydrogel with high mechanical properties. In addition, the interstitial injection provides a strategy for the use of hydrogels in vivo.
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Affiliation(s)
- Kai Li
- College of Life Science, Beijing University of Chinese Medicine, Beijing, 100029, China
- CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
| | - Yuting Zhu
- CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
| | - Qiang Zhang
- Hebei Key Laboratory of Nanobiotechnology, Yanshan University, Qinhuangdao, 066004, China
| | - Yahong Shi
- College of Life Science, Beijing University of Chinese Medicine, Beijing, 100029, China
- CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
| | - Tun Yan
- College of Life Science, Beijing University of Chinese Medicine, Beijing, 100029, China
- CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
| | - Xi Lu
- College of Life Science, Beijing University of Chinese Medicine, Beijing, 100029, China
- CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
| | - Huizhen Sun
- College of Life Science, Beijing University of Chinese Medicine, Beijing, 100029, China
- CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
| | - Tingting Li
- College of Life Science, Beijing University of Chinese Medicine, Beijing, 100029, China
- CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
| | - Zhongxian Li
- CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
| | - Xiaoli Shi
- CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
- School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Dong Han
- College of Life Science, Beijing University of Chinese Medicine, Beijing, 100029, China
- CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
- School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, China
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Vesga-Castro C, Aldazabal J, Vallejo-Illarramendi A, Paredes J. Contractile force assessment methods for in vitro skeletal muscle tissues. eLife 2022; 11:e77204. [PMID: 35604384 PMCID: PMC9126583 DOI: 10.7554/elife.77204] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Accepted: 04/27/2022] [Indexed: 02/06/2023] Open
Abstract
Over the last few years, there has been growing interest in measuring the contractile force (CF) of engineered muscle tissues to evaluate their functionality. However, there are still no standards available for selecting the most suitable experimental platform, measuring system, culture protocol, or stimulation patterns. Consequently, the high variability of published data hinders any comparison between different studies. We have identified that cantilever deflection, post deflection, and force transducers are the most commonly used configurations for CF assessment in 2D and 3D models. Additionally, we have discussed the most relevant emerging technologies that would greatly complement CF evaluation with intracellular and localized analysis. This review provides a comprehensive analysis of the most significant advances in CF evaluation and its critical parameters. In order to compare contractile performance across experimental platforms, we have used the specific force (sF, kN/m2), CF normalized to the calculated cross-sectional area (CSA). However, this parameter presents a high variability throughout the different studies, which indicates the need to identify additional parameters and complementary analysis suitable for proper comparison. We propose that future contractility studies in skeletal muscle constructs report detailed information about construct size, contractile area, maturity level, sarcomere length, and, ideally, the tetanus-to-twitch ratio. These studies will hopefully shed light on the relative impact of these variables on muscle force performance of engineered muscle constructs. Prospective advances in muscle tissue engineering, particularly in muscle disease models, will require a joint effort to develop standardized methodologies for assessing CF of engineered muscle tissues.
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Affiliation(s)
- Camila Vesga-Castro
- University of Navarra, Tecnun School of Engineering, Manuel de LardizábalSan SebastianSpain
- University of Navarra, Biomedical Engineering Center, Campus UniversitarioPamplonaSpain
- Group of Neurosciences, Department of Pediatrics, UPV/EHU, Hospital Donostia - IIS BiodonostiaSan SebastianSpain
| | - Javier Aldazabal
- University of Navarra, Tecnun School of Engineering, Manuel de LardizábalSan SebastianSpain
- University of Navarra, Biomedical Engineering Center, Campus UniversitarioPamplonaSpain
| | - Ainara Vallejo-Illarramendi
- Group of Neurosciences, Department of Pediatrics, UPV/EHU, Hospital Donostia - IIS BiodonostiaSan SebastianSpain
- CIBERNED, Instituto de Salud Carlos III, Ministry of Science, Innovation, and UniversitiesMadridSpain
| | - Jacobo Paredes
- University of Navarra, Tecnun School of Engineering, Manuel de LardizábalSan SebastianSpain
- University of Navarra, Biomedical Engineering Center, Campus UniversitarioPamplonaSpain
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Nomura T, Hayakawa K, Sato N, Obinata T. Periodic Stretching of Cultured Myotubes Enhances Myofibril Assembly. Zoolog Sci 2022; 39. [DOI: 10.2108/zs220015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Accepted: 03/22/2022] [Indexed: 11/17/2022]
Affiliation(s)
- Takahiro Nomura
- Department of Biology, Graduate School of Science and Technology, Chiba University, Yayoi-cho, Inage-ku, Chiba 263-8522, Chiba, Japan
| | - Kimihide Hayakawa
- Department of Biology, Graduate School of Science and Technology, Chiba University, Yayoi-cho, Inage-ku, Chiba 263-8522, Chiba, Japan
| | - Naruki Sato
- Department of Biology, Graduate School of Science and Technology, Chiba University, Yayoi-cho, Inage-ku, Chiba 263-8522, Chiba, Japan
| | - Takashi Obinata
- Department of Biology, Graduate School of Science and Technology, Chiba University, Yayoi-cho, Inage-ku, Chiba 263-8522, Chiba, Japan
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Customized bioreactor enables the production of 3D diaphragmatic constructs influencing matrix remodeling and fibroblast overgrowth. NPJ Regen Med 2022; 7:25. [PMID: 35468920 PMCID: PMC9038738 DOI: 10.1038/s41536-022-00222-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2021] [Accepted: 03/01/2022] [Indexed: 02/06/2023] Open
Abstract
The production of skeletal muscle constructs useful for replacing large defects in vivo, such as in congenital diaphragmatic hernia (CDH), is still considered a challenge. The standard application of prosthetic material presents major limitations, such as hernia recurrences in a remarkable number of CDH patients. With this work, we developed a tissue engineering approach based on decellularized diaphragmatic muscle and human cells for the in vitro generation of diaphragmatic-like tissues as a proof-of-concept of a new option for the surgical treatment of large diaphragm defects. A customized bioreactor for diaphragmatic muscle was designed to control mechanical stimulation and promote radial stretching during the construct engineering. In vitro tests demonstrated that both ECM remodeling and fibroblast overgrowth were positively influenced by the bioreactor culture. Mechanically stimulated constructs also increased tissue maturation, with the formation of new oriented and aligned muscle fibers. Moreover, after in vivo orthotopic implantation in a surgical CDH mouse model, mechanically stimulated muscles maintained the presence of human cells within myofibers and hernia recurrence did not occur, suggesting the value of this approach for treating diaphragm defects.
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Sugimoto T, Imai S, Yoshikawa M, Fujisato T, Hashimoto T, Nakamura T. Mechanical unloading in 3D-engineered muscle leads to muscle atrophy by suppressing protein synthesis. J Appl Physiol (1985) 2022; 132:1091-1103. [PMID: 35297688 DOI: 10.1152/japplphysiol.00323.2021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Three dimensional (3D)-engineered muscle is an useful approach to a more comprehensive understanding of molecular mechanisms underlying unloading-induced muscle atrophy. We investigated the effects of mechanical unloading on molecular muscle protein synthesis (MPS)- and muscle protein breakdown (MPB)-related signaling pathways involved in muscle atrophy in 3D-engineered muscle, and to better understand in vitro model of muscle disuse. The 3D-engineered muscle consisting of C2C12 myoblasts and type-1 collagen gel was allowed to differentiate for 2 weeks and divided into three groups: 0 days of stretched-on control (CON), 2 and/or 7 days of stretched-on (ON), in which both ends of the muscle were fixed with artificial tendons, and the stretched-off group (OFF), in which one side of the artificial tendon was detached. Muscle weight (-38.1 to -48.4%), length (-67.0 to -73.5%), twitch contractile force (-70.5 to -75.0%) and myosin heavy chain expression (-32.5 to -50.5%) in the OFF group were significantly decreased on days 2 and 7 compared with the ON group (P < 0.05, respectively), despite that ON group was stable over time. Although determinative molecular signaling could not be identified, the MPS rate reflected by puromysin labeled protein was significantly decreased following mechanical unloading (P < 0.05, -38.5 to -51.1%). Meanwhile, MPB, particularly the ubiquitin-proteasome pathway, was not impacted. Hence, mechanical unloading of 3D-engineered muscle in vitro leads to muscle atrophy by suppressing MPS, cell differentiation, and cell growth rather than the promotion of MPB.
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Affiliation(s)
- Takeshi Sugimoto
- Faculty of Sport and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
| | - Shoma Imai
- Division of Human Sciences, Faculty of Engineering, Osaka Institute of Technology, Ohmiya, Osaka, Japan
| | - Maki Yoshikawa
- Faculty of Sport and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
| | - Toshia Fujisato
- Biomedical Engineering Graduate School of Engineering, Osaka Institute of Technology, Ohmiya, Osaka, Japan
| | - Takeshi Hashimoto
- Faculty of Sport and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
| | - Tomohiro Nakamura
- Division of Human Sciences, Faculty of Engineering, Osaka Institute of Technology, Ohmiya, Osaka, Japan
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Turner DC, Gorski PP, Seaborne RA, Viggars M, Murphy M, Jarvis JC, Martin NR, Stewart CE, Sharples AP. Mechanical loading of bioengineered skeletal muscle in vitro recapitulates gene expression signatures of resistance exercise in vivo. J Cell Physiol 2021; 236:6534-6547. [PMID: 33586196 PMCID: PMC8653897 DOI: 10.1002/jcp.30328] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 01/17/2021] [Accepted: 02/03/2021] [Indexed: 11/10/2022]
Abstract
Understanding the role of mechanical loading and exercise in skeletal muscle (SkM) is paramount for delineating the molecular mechanisms that govern changes in muscle mass. However, it is unknown whether loading of bioengineered SkM in vitro adequately recapitulates the molecular responses observed after resistance exercise (RE) in vivo. To address this, the transcriptional and epigenetic (DNA methylation) responses were compared after mechanical loading in bioengineered SkM in vitro and after RE in vivo. Specifically, genes known to be upregulated/hypomethylated after RE in humans were analyzed. Ninety-three percent of these genes demonstrated similar changes in gene expression post-loading in the bioengineered muscle when compared to acute RE in humans. Furthermore, similar differences in gene expression were observed between loaded bioengineered SkM and after programmed RT in rat SkM tissue. Hypomethylation occurred for only one of the genes analysed (GRIK2) post-loading in bioengineered SkM. To further validate these findings, DNA methylation and mRNA expression of known hypomethylated and upregulated genes post-acute RE in humans were also analyzed at 0.5, 3, and 24 h post-loading in bioengineered muscle. The largest changes in gene expression occurred at 3 h, whereby 82% and 91% of genes responded similarly when compared to human and rodent SkM respectively. DNA methylation of only a small proportion of genes analyzed (TRAF1, MSN, and CTTN) significantly increased post-loading in bioengineered SkM alone. Overall, mechanical loading of bioengineered SkM in vitro recapitulates the gene expression profile of human and rodent SkM after RE in vivo. Although some genes demonstrated differential DNA methylation post-loading in bioengineered SkM, such changes across the majority of genes analyzed did not closely mimic the epigenetic response to acute-RE in humans.
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Affiliation(s)
- Daniel C. Turner
- Institute for Science and Technology in Medicine (ISTM), School of Pharmacy and BioengineeringKeele UniversityStaffordshireUK
- Stem Cells, Ageing and Molecular Physiology Unit (SCAMP), Exercise Metabolism and Adaptation Research Group (EMARG), Research Institute for Sport and Exercise Sciences (RISES)Liverpool John Moores UniversityLiverpoolUK
- Randall Centre for Cell and Molecular Biophysics, School of Basic and Medical BiosciencesKing's College LondonLondonUK
| | - Piotr P. Gorski
- Institute for Science and Technology in Medicine (ISTM), School of Pharmacy and BioengineeringKeele UniversityStaffordshireUK
- Institute for Physical PerformanceNorwegian School of Sport Sciences (NiH)OsloNorway
| | - Robert A. Seaborne
- Stem Cells, Ageing and Molecular Physiology Unit (SCAMP), Exercise Metabolism and Adaptation Research Group (EMARG), Research Institute for Sport and Exercise Sciences (RISES)Liverpool John Moores UniversityLiverpoolUK
- Center for Genomics and Child Health, Blizard Institute, Barts and the London School of Medicine and DentistryQueen Mary University of LondonLondonUK
| | - Mark Viggars
- Stem Cells, Ageing and Molecular Physiology Unit (SCAMP), Exercise Metabolism and Adaptation Research Group (EMARG), Research Institute for Sport and Exercise Sciences (RISES)Liverpool John Moores UniversityLiverpoolUK
| | - Mark Murphy
- School of Pharmacy and Biomolecular SciencesLiverpool John Moores UniversityLiverpoolUK
| | - Jonathan C. Jarvis
- Stem Cells, Ageing and Molecular Physiology Unit (SCAMP), Exercise Metabolism and Adaptation Research Group (EMARG), Research Institute for Sport and Exercise Sciences (RISES)Liverpool John Moores UniversityLiverpoolUK
| | - Neil R.W. Martin
- School of Sport, Exercise and Health SciencesLoughborough UniversityLoughboroughUK
| | - Claire E. Stewart
- Stem Cells, Ageing and Molecular Physiology Unit (SCAMP), Exercise Metabolism and Adaptation Research Group (EMARG), Research Institute for Sport and Exercise Sciences (RISES)Liverpool John Moores UniversityLiverpoolUK
| | - Adam P. Sharples
- Institute for Physical PerformanceNorwegian School of Sport Sciences (NiH)OsloNorway
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Ren D, Song J, Liu R, Zeng X, Yan X, Zhang Q, Yuan X. Molecular and Biomechanical Adaptations to Mechanical Stretch in Cultured Myotubes. Front Physiol 2021; 12:689492. [PMID: 34408658 PMCID: PMC8365838 DOI: 10.3389/fphys.2021.689492] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Accepted: 06/29/2021] [Indexed: 11/24/2022] Open
Abstract
Myotubes are mature muscle cells that form the basic structural element of skeletal muscle. When stretching skeletal muscles, myotubes are subjected to passive tension as well. This lead to alterations in myotube cytophysiology, which could be related with muscular biomechanics. During the past decades, much progresses have been made in exploring biomechanical properties of myotubes in vitro. In this review, we integrated the studies focusing on cultured myotubes being mechanically stretched, and classified these studies into several categories: amino acid and glucose uptake, protein turnover, myotube hypertrophy and atrophy, maturation, alignment, secretion of cytokines, cytoskeleton adaption, myotube damage, ion channel activation, and oxidative stress in myotubes. These biomechanical adaptions do not occur independently, but interconnect with each other as part of the systematic mechanoresponse of myotubes. The purpose of this review is to broaden our comprehensions of stretch-induced muscular alterations in cellular and molecular scales, and to point out future challenges and directions in investigating myotube biomechanical manifestations.
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Affiliation(s)
- Dapeng Ren
- Department of Stomatology Medical Center, The Affiliated Hospital of Qingdao University, Qingdao, China.,College of Dentistry, Qingdao University, Qingdao, China
| | - Jing Song
- Department of Stomatology Medical Center, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Ran Liu
- Department of Stomatology Medical Center, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Xuemin Zeng
- Department of Stomatology Medical Center, The Affiliated Hospital of Qingdao University, Qingdao, China.,College of Dentistry, Qingdao University, Qingdao, China
| | - Xiao Yan
- Department of Stomatology Medical Center, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Qiang Zhang
- Department of Stomatology Medical Center, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Xiao Yuan
- Department of Stomatology Medical Center, The Affiliated Hospital of Qingdao University, Qingdao, China
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Langendorf EK, Rommens PM, Drees P, Ritz U. Dexamethasone Inhibits the Pro-Angiogenic Potential of Primary Human Myoblasts. Int J Mol Sci 2021; 22:ijms22157986. [PMID: 34360750 PMCID: PMC8348204 DOI: 10.3390/ijms22157986] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 07/19/2021] [Accepted: 07/23/2021] [Indexed: 12/12/2022] Open
Abstract
Tissue regeneration depends on the complex processes of angiogenesis, inflammation and wound healing. Regarding muscle tissue, glucocorticoids (GCs) inhibit pro-inflammatory signalling and angiogenesis and lead to muscle atrophy. Our hypothesis is that the synthetic GC dexamethasone (dex) impairs angiogenesis leading to muscle atrophy or inhibited muscle regeneration. Therefore, this study aims to elucidate the effect of dexamethasone on HUVECs under different conditions in mono- and co-culture with myoblasts to evaluate growth behavior and dex impact with regard to muscle atrophy and muscle regeneration. Viability assays, qPCR, immunofluorescence as well as ELISAs were performed on HUVECs, and human primary myoblasts seeded under different culture conditions. Our results show that dex had a higher impact on the tube formation when HUVECs were maintained with VEGF. Gene expression was not influenced by dex and was independent of cells growing in a 2D or 3D matrix. In co-culture CD31 expression was suppressed after incubation with dex and gene expression analysis revealed that dex enhanced expression of myogenic transcription factors, but repressed angiogenic factors. Moreover, dex inhibited the VEGF mediated pro angiogenic effect of myoblasts and inhibited expression of angiogenic inducers in the co-culture model. This is the first study describing a co-culture of human primary myoblast and HUVECs maintained under different conditions. Our results indicate that dex affects angiogenesis via inhibition of VEGF release at least in myoblasts, which could be responsible not only for the development of muscle atrophy after dex administration, but also for inhibition of muscle regeneration after vascular damage.
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Affiliation(s)
| | | | | | - Ulrike Ritz
- Correspondence: ; Tel.: +49-6131-17-2359 (ext. 55131)
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Chen F, Hao L, Zhu S, Yang X, Shi W, Zheng K, Wang T, Chen H. Potential Adverse Effects of Dexamethasone Therapy on COVID-19 Patients: Review and Recommendations. Infect Dis Ther 2021; 10:1907-1931. [PMID: 34296386 PMCID: PMC8298044 DOI: 10.1007/s40121-021-00500-z] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 07/06/2021] [Indexed: 12/12/2022] Open
Abstract
In the context of the coronavirus disease 2019 (COVID-19) pandemic, the global healthcare community has raced to find effective therapeutic agents against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). To date, dexamethasone is the first and an important therapeutic to significantly reduce the risk of death in COVID-19 patients with severe disease. Due to powerful anti-inflammatory and immunosuppressive effects, dexamethasone could attenuate SARS-CoV-2-induced uncontrolled cytokine storm, severe acute respiratory distress syndrome and lung injury. Nevertheless, dexamethasone treatment is a double-edged sword, as numerous studies have revealed that it has significant adverse impacts later in life. In this article, we reviewed the literature regarding the adverse effects of dexamethasone administration on different organ systems as well as related disease pathogenesis in an attempt to clarify the potential harms that may arise in COVID-19 patients receiving dexamethasone treatment. Overall, taking the threat of COVID19 pandemic into account, we think it is necessary to apply dexamethasone as a pharmaceutical therapy in critical patients. However, its adverse side effects cannot be ignored. Our review will help medical professionals in the prognosis and follow-up of patients treated with dexamethasone. In addition, given that a considerable amount of uncertainty, confusion and even controversy still exist, further studies and more clinical trials are urgently needed to improve our understanding of the parameters and the effects of dexamethasone on patients with SARS-CoV-2 infection.
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Affiliation(s)
- Fei Chen
- Department of Physiology, Jining Medical University, 133 Hehua Rd, Jining, 272067, China.
| | - Lanting Hao
- Department of Physiology, Jining Medical University, 133 Hehua Rd, Jining, 272067, China
| | - Shiheng Zhu
- Department of Physiology, Jining Medical University, 133 Hehua Rd, Jining, 272067, China
| | - Xinyuan Yang
- Department of Physiology, Jining Medical University, 133 Hehua Rd, Jining, 272067, China
| | - Wenhao Shi
- Department of Physiology, Jining Medical University, 133 Hehua Rd, Jining, 272067, China
| | - Kai Zheng
- Department of Physiology, Jining Medical University, 133 Hehua Rd, Jining, 272067, China
| | - Tenger Wang
- Department of Physiology, Jining Medical University, 133 Hehua Rd, Jining, 272067, China
| | - Huiran Chen
- Department of Physiology, Jining Medical University, 133 Hehua Rd, Jining, 272067, China
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Peris-Moreno D, Cussonneau L, Combaret L, Polge C, Taillandier D. Ubiquitin Ligases at the Heart of Skeletal Muscle Atrophy Control. Molecules 2021; 26:molecules26020407. [PMID: 33466753 PMCID: PMC7829870 DOI: 10.3390/molecules26020407] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 01/08/2021] [Accepted: 01/10/2021] [Indexed: 02/07/2023] Open
Abstract
Skeletal muscle loss is a detrimental side-effect of numerous chronic diseases that dramatically increases mortality and morbidity. The alteration of protein homeostasis is generally due to increased protein breakdown while, protein synthesis may also be down-regulated. The ubiquitin proteasome system (UPS) is a master regulator of skeletal muscle that impacts muscle contractile properties and metabolism through multiple levers like signaling pathways, contractile apparatus degradation, etc. Among the different actors of the UPS, the E3 ubiquitin ligases specifically target key proteins for either degradation or activity modulation, thus controlling both pro-anabolic or pro-catabolic factors. The atrogenes MuRF1/TRIM63 and MAFbx/Atrogin-1 encode for key E3 ligases that target contractile proteins and key actors of protein synthesis respectively. However, several other E3 ligases are involved upstream in the atrophy program, from signal transduction control to modulation of energy balance. Controlling E3 ligases activity is thus a tempting approach for preserving muscle mass. While indirect modulation of E3 ligases may prove beneficial in some situations of muscle atrophy, some drugs directly inhibiting their activity have started to appear. This review summarizes the main signaling pathways involved in muscle atrophy and the E3 ligases implicated, but also the molecules potentially usable for future therapies.
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