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Das I, Shay-Winkler K, Emmert ME, Goh Q, Cornwall R. The Relative Efficacy of Available Proteasome Inhibitors in Preventing Muscle Contractures Following Neonatal Brachial Plexus Injury. J Bone Joint Surg Am 2024; 106:727-734. [PMID: 38194588 PMCID: PMC11023787 DOI: 10.2106/jbjs.23.00513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2024]
Abstract
BACKGROUND Contractures following neonatal brachial plexus injury (NBPI) are associated with growth deficits in denervated muscles. This impairment is mediated by an increase in muscle protein degradation, as contractures can be prevented in an NBPI mouse model with bortezomib (BTZ), a proteasome inhibitor (PI). However, BTZ treatment causes substantial toxicity (0% to 80% mortality). The current study tested the hypothesis that newer-generation PIs can prevent contractures with less severe toxicity than BTZ. METHODS Unilateral brachial plexus injuries were surgically created in postnatal (5-day-old) mice. Following NBPI, mice were treated with either saline solution or various doses of 1 of 3 different PIs: ixazomib (IXZ), carfilzomib (CFZ), or marizomib (MRZ). Four weeks post-NBPI, mice were assessed for bilateral passive range of motion at the shoulder and elbow joints, with blinding to the treatment group, through an established digital photography technique to determine contracture severity. Drug toxicity was assessed with survival curves. RESULTS All PIs prevented contractures at both the elbow and shoulder (p < 0.05 versus saline solution controls), with the exception of IXZ, which did not prevent shoulder contractures. However, their efficacies and toxicity profiles differed. At lower doses, CFZ was limited by toxicity (30% to 40% mortality), whereas MRZ was limited by efficacy. At higher doses, CFZ was limited by loss of efficacy, MRZ was limited by toxicity (50% to 60% mortality), and IXZ was limited by toxicity (80% to 100% mortality) and loss of efficacy. Comparisons of the data on these drugs as well as data on BTZ generated in prior studies revealed BTZ to be optimal for preventing contractures, although it, too, was limited by toxicity. CONCLUSIONS All of the tested second-generation PIs were able to reduce NBPI-induced contractures, offering further proof of concept for a regulatory role of the proteasome in contracture formation. However, the narrow dose ranges of efficacy for all PIs highlight the necessity of precise proteasome regulation for preventing contractures. Finally, the substantial toxicity stemming from proteasome inhibition underscores the importance of identifying muscle-targeted strategies to suppress protein degradation and prevent contractures safely. CLINICAL RELEVANCE Although PIs offer unique opportunities to establish critical mechanistic insights into contracture pathophysiology, their clinical use is contraindicated in patients with NPBI at this time.
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Affiliation(s)
- Indranshu Das
- Department of Medical Sciences, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Kritton Shay-Winkler
- Division of Orthopaedic Surgery, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Marianne E Emmert
- Division of Orthopaedic Surgery, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Qingnian Goh
- Division of Orthopaedic Surgery, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
- Department of Orthopaedic Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Roger Cornwall
- Division of Orthopaedic Surgery, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
- Department of Orthopaedic Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio
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Runkel MT, Tarabishi A, Shay-Winkler K, Emmert ME, Goh Q, Cornwall R. The role of sympathetic innervation in neonatal muscle growth and neuromuscular contractures. FEBS J 2023; 290:4877-4898. [PMID: 37462535 PMCID: PMC10592371 DOI: 10.1111/febs.16908] [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: 12/28/2022] [Revised: 06/05/2023] [Accepted: 07/17/2023] [Indexed: 07/26/2023]
Abstract
Neonatal brachial plexus injury (NBPI), a leading cause of pediatric upper limb paralysis, results in disabling and incurable muscle contractures that are driven by impaired longitudinal growth of denervated muscles. A rare form of NBPI, which maintains both afferent and sympathetic muscle innervation despite motor denervation, protects against contractures. We have previously ruled out a role for NRG/ErbB signaling, the predominant pathway governing antegrade afferent neuromuscular transmission, in modulating the formation of contractures. Our current study therefore investigated the contributions of sympathetic innervation of skeletal muscle in modulating NBPI-induced contractures. Through chemical sympathectomy and pharmacologic modification with a β2 -adrenergic agonist, we discovered that sympathetic innervation alone is neither required nor sufficient to modulate contracture formation in neonatal mice. Despite this, sympathetic innervation plays an intriguing sex-specific role in mediating neonatal muscle growth, as the cross-sectional area (CSA) and volume of normally innervated male muscles were diminished by ablation of sympathetic neurons and increased by β-adrenergic stimulation. Intriguingly, the robust alterations in CSA occurred with minimal changes to normal longitudinal muscle growth as determined by sarcomere length. Instead, β-adrenergic stimulation exacerbated sarcomere overstretch in denervated male muscles, indicating potentially discrete regulation of muscle width and length. Future investigations into the mechanistic underpinnings of these distinct aspects of muscle growth are thus essential for improving clinical outcomes in patients affected by muscle disorders in which both length and width are affected.
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Affiliation(s)
- Mason T. Runkel
- Department of Health Sciences, Butler University, Indianapolis, IN, USA
| | - Albaraa Tarabishi
- Department of Biochemistry, University of Cincinnati, Cincinnati, OH, USA
| | - Kritton Shay-Winkler
- Division of Orthopaedic Surgery, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, USA
| | - Marianne E. Emmert
- Division of Orthopaedic Surgery, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, USA
| | - Qingnian Goh
- Division of Orthopaedic Surgery, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, USA
- Department of Orthopaedic Surgery, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Roger Cornwall
- Division of Orthopaedic Surgery, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, USA
- Department of Orthopaedic Surgery, University of Cincinnati College of Medicine, Cincinnati, OH, USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, USA
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Fernandez A, Aubry-Rozier B, Vautey M, Berna C, Suter MR. Small fiber neuropathy in hypermobile Ehlers Danlos syndrome/hypermobility spectrum disorder. J Intern Med 2022; 292:957-960. [PMID: 35781355 PMCID: PMC9796626 DOI: 10.1111/joim.13539] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Aurore Fernandez
- Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland.,Pain Center, Department of Anesthesiology, Lausanne University Hospital (CHUV), Lausanne, Switzerland.,Center for Integrative and Complementary Medicine, Department of Anesthesiology, Lausanne University Hospital (CHUV), Lausanne, Switzerland
| | - Bérengère Aubry-Rozier
- Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland.,Department of Rheumatology, Lausanne University Hospital (CHUV), Lausanne, Switzerland
| | - Mathieu Vautey
- Center for Integrative and Complementary Medicine, Department of Anesthesiology, Lausanne University Hospital (CHUV), Lausanne, Switzerland
| | - Chantal Berna
- Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland.,Pain Center, Department of Anesthesiology, Lausanne University Hospital (CHUV), Lausanne, Switzerland.,Center for Integrative and Complementary Medicine, Department of Anesthesiology, Lausanne University Hospital (CHUV), Lausanne, Switzerland
| | - Marc R Suter
- Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland.,Pain Center, Department of Anesthesiology, Lausanne University Hospital (CHUV), Lausanne, Switzerland
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Neuregulin-1/ErbB4 upregulates acetylcholine receptors via Akt/mTOR/p70S6K: a study in a rat model of obstetric brachial plexus palsy and in vitro. Acta Biochim Biophys Sin (Shanghai) 2022; 54:1648-1657. [PMID: 36331297 PMCID: PMC9828288 DOI: 10.3724/abbs.2022158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
In obstetric brachial plexus palsy (OBPP), the operative time window for nerve reconstruction of the intrinsic muscles of the hand (IMH) is much shorter than that of biceps. The reason is that the atrophy of IMH becomes irreversible more quickly than that of biceps. A previous study confirmed that the motor endplates of denervated intrinsic muscles of the forepaw (IMF) were destabilized, while those of denervated biceps remained intact. However, the specific molecular mechanism of regulating the self-repair of motor endplates is still unknown. In this study, we use a rat model of OBPP with right C5-C6 rupture plus C7-C8-T1 avulsion and left side as a control. Bilateral IMF and biceps are harvested at 5 weeks postinjury to assess relative protein and mRNA expression. We also use L6 skeletal myoblasts to verify the effects of signaling pathways regulating acetylcholine receptor (AChR) protein synthesis in vitro. The results show that in the OBPP rat model, the protein and mRNA expression levels of NRG-1/ErbB4 and phosphorylation of Akt/mTOR/p70S6K are lower in denervated IMF than in denervated biceps. In L6 myoblasts stimulated with NRG-1, overexpression and knockdown of ErbB4 lead to upregulation and downregulation of AChR subunit protein synthesis and Akt/mTOR/p70S6K phosphorylation, respectively. Inhibition of mTOR abolishes protein synthesis of AChR subunits elevated by NRG-1/ErbB4. Our findings suggest that in the OBPP rat model, lower expression of AChR subunits in the motor endplates of denervated IMF is associated with downregulation of NRG-1/ErbB4 and phosphorylation of Akt/mTOR/p70S6K. NRG-1/ErbB4 can promote protein synthesis of the AChR subunits in L6 myoblasts via phosphorylation of Akt/mTOR/p70S6K.
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Lu W, Jiang Z, Tang C, Wang P, Yang L. Molecular mechanisms by which targeted muscle reinnervation improves the microenvironment of spinal cord motor neurons and target muscles. Neurosci Lett 2022; 789:136879. [PMID: 36152746 DOI: 10.1016/j.neulet.2022.136879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 08/17/2022] [Accepted: 09/15/2022] [Indexed: 11/30/2022]
Abstract
Targeted muscle reinnervation is a clinically valuable nerve transfers technology used to reconstruct the information sources reconstruct the motor nerve information sources lost because of nerve injury. This study aimed to investigate the effects and underlying molecular mechanisms of hind limb TMR on motor neurons and target muscles in rats after tibial nerve transection (TNT). Immunohistochemistry was performed to detect acetylcholinesterase expression in the target muscles and myelin basic protein, neuregulin-1 (NRG1), and ErbB2 expression in the tibial nerve of rats. Masson's trichrome staining was performed to observe fibrillar collagen expression in the target muscles. Western blot analysis was used to detect the protein expression of NRG1 and its receptor, ErbB2, in the target muscles. TMR significantly enhanced NRG1, ErbB2, and myelin basic protein expression in nerve fibers compared with those in the TNT group and exerted a protective effect on the maintenance of a large number of nerve fibers and myelin sheath thickness. The above results indicated that TMR can regulate NRG1 and ErbB2 expression in residual nerve fibers and protect the integrity of the myelin sheath, thus improving the functional status of the target muscles, which is beneficial for restoring hind limb motor function after TNT.
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Affiliation(s)
- Wei Lu
- College of Basic Medicine, Guangdong Jiangmen Chinese Medical College, Jiangmen, China
| | - Zhendong Jiang
- Department of Human Anatomy, Zhuhai Campus of Zunyi Medical University, Zhuhai, China
| | - Chunxiao Tang
- Department of Human Anatomy, Zhuhai Campus of Zunyi Medical University, Zhuhai, China
| | - Ping Wang
- Department of Human Anatomy, Zhuhai Campus of Zunyi Medical University, Zhuhai, China
| | - Lin Yang
- Department of Human Anatomy, Zhuhai Campus of Zunyi Medical University, Zhuhai, China; Key Laboratory of Human-Machine Intelligence-Synergy Systems, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences (CAS), Shenzhen 518055, China.
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Shi J, Li W, Liu A, Ren L, Zhang P, Jiang T, Han Y, Liu L. MiRNA sequencing of Embryonic Myogenesis in Chengkou Mountain Chicken. BMC Genomics 2022; 23:571. [PMID: 35948880 PMCID: PMC9364561 DOI: 10.1186/s12864-022-08795-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Accepted: 07/27/2022] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Skeletal muscle tissue is among the largest organ systems in mammals, essential for survival and movement. Embryonic muscle development determines the quantity and quality of muscles after the birth of an individual. MicroRNAs (miRNAs) are a significant class of non-coding RNAs that bind to the 3'UTR region of mRNA to regulate gene function. Total RNA was extracted from the leg muscles of chicken embryos in different developmental stages of Chengkou Mountain Chicken and used to generate 171,407,341 clean small RNA reads. Target prediction, GO, and KEGG enrichment analyses determined the significantly enriched genes and pathways. Differential analysis determined the significantly different miRNAs between chicken embryo leg muscles at different developmental stages. Meanwhile, the weighted correlation network analysis (WGCNA) identified key modules in different developmental stages, and the hub miRNAs were screened following the KME value. RESULTS The clean reads contained 2047 miRNAs, including 721 existing miRNAs, 1059 known miRNAs, and 267 novel miRNAs. Many genes and pathways related to muscle development were identified, including ERBB4, MEF2C, FZD4, the Wnt, Notch, and MAPK signaling pathways. The WGCNA established the greenyellow module and gga-miR-130b-5p for E12, magenta module and gga-miR-1643-5p for E16, purple module and gga-miR-12218-5p for E19, cyan module and gga-miR-132b-5p for E21. CONCLUSION These results lay a foundation for further research on the molecular regulatory mechanism of embryonic muscle development in Chengkou mountain chicken and provide a reference for other poultry and livestock muscle development studies.
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Affiliation(s)
- Jun'an Shi
- College of Animal Science and Technology, Chongqing Key Laboratory of Herbivore Science, Southwest University, Beibei, Chongqing, 400700, China
| | - Wendong Li
- College of Animal Science and Technology, Chongqing Key Laboratory of Herbivore Science, Southwest University, Beibei, Chongqing, 400700, China
| | - Anfang Liu
- College of Animal Science and Technology, Chongqing Key Laboratory of Herbivore Science, Southwest University, Beibei, Chongqing, 400700, China
| | - Lingtong Ren
- College of Animal Science and Technology, Chongqing Key Laboratory of Herbivore Science, Southwest University, Beibei, Chongqing, 400700, China
| | - Pusen Zhang
- College of Animal Science and Technology, Chongqing Key Laboratory of Herbivore Science, Southwest University, Beibei, Chongqing, 400700, China
| | - Ting Jiang
- College of Animal Science and Technology, Chongqing Key Laboratory of Herbivore Science, Southwest University, Beibei, Chongqing, 400700, China
| | - Yuqing Han
- College of Animal Science and Technology, Chongqing Key Laboratory of Herbivore Science, Southwest University, Beibei, Chongqing, 400700, China
| | - Lingbin Liu
- College of Animal Science and Technology, Chongqing Key Laboratory of Herbivore Science, Southwest University, Beibei, Chongqing, 400700, China.
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Emmert ME, Aggarwal P, Shay-Winkler K, Lee SJ, Goh Q, Cornwall R. Sex-specific role of myostatin signaling in neonatal muscle growth, denervation atrophy, and neuromuscular contractures. eLife 2022; 11:81121. [PMID: 36314781 PMCID: PMC9873256 DOI: 10.7554/elife.81121] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Accepted: 10/31/2022] [Indexed: 01/27/2023] Open
Abstract
Neonatal brachial plexus injury (NBPI) causes disabling and incurable muscle contractures that result from impaired longitudinal growth of denervated muscles. This deficit in muscle growth is driven by increased proteasome-mediated protein degradation, suggesting a dysregulation of muscle proteostasis. The myostatin (MSTN) pathway, a prominent muscle-specific regulator of proteostasis, is a putative signaling mechanism by which neonatal denervation could impair longitudinal muscle growth, and thus a potential target to prevent NBPI-induced contractures. Through a mouse model of NBPI, our present study revealed that pharmacologic inhibition of MSTN signaling induces hypertrophy, restores longitudinal growth, and prevents contractures in denervated muscles of female but not male mice, despite inducing hypertrophy of normally innervated muscles in both sexes. Additionally, the MSTN-dependent impairment of longitudinal muscle growth after NBPI in female mice is associated with perturbation of 20S proteasome activity, but not through alterations in canonical MSTN signaling pathways. These findings reveal a sex dimorphism in the regulation of neonatal longitudinal muscle growth and contractures, thereby providing insights into contracture pathophysiology, identifying a potential muscle-specific therapeutic target for contracture prevention, and underscoring the importance of sex as a biological variable in the pathophysiology of neuromuscular disorders.
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Affiliation(s)
- Marianne E Emmert
- Department of Medical Sciences, University of Cincinnati College of MedicineCincinnatiUnited States
| | - Parul Aggarwal
- Division of Orthopaedic Surgery, Cincinnati Children’s Hospital Medical CenterCincinnatiUnited States
| | - Kritton Shay-Winkler
- Division of Orthopaedic Surgery, Cincinnati Children’s Hospital Medical CenterCincinnatiUnited States
| | - Se-Jin Lee
- The Jackson LaboratoryFarmingtonUnited States,Department of Genetics and Genome Sciences, University of Connecticut School of MedicineFarmingtonUnited States
| | - Qingnian Goh
- Division of Orthopaedic Surgery, Cincinnati Children’s Hospital Medical CenterCincinnatiUnited States,Department of Orthopaedic Surgery, University of Cincinnati College of MedicineCincinnatiUnited States
| | - Roger Cornwall
- Division of Orthopaedic Surgery, Cincinnati Children’s Hospital Medical CenterCincinnatiUnited States,Department of Orthopaedic Surgery, University of Cincinnati College of MedicineCincinnatiUnited States,Division of Developmental Biology, Cincinnati Children’s Hospital Medical CenterCincinnatiUnited States,Department of Pediatrics, University of Cincinnati College of MedicineCincinnatiUnited States
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