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Jiang Y, Zhou R, Liao F, Kong G, Zeng J, Wu Y, Li X, Wang B, Qi F, Chen S, Zhu Q, Gu L, Zheng C. Unraveling radiation-induced skeletal muscle damage: Insights from a 3D human skeletal muscle organoid model. BIOCHIMICA ET BIOPHYSICA ACTA. MOLECULAR CELL RESEARCH 2024:119792. [PMID: 38936620 DOI: 10.1016/j.bbamcr.2024.119792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 05/28/2024] [Accepted: 06/19/2024] [Indexed: 06/29/2024]
Abstract
BACKGROUND Three-dimensional (3D) organoids derived from human pluripotent stem cells (hPSCs) have revolutionized in vitro tissue modeling, offering a unique opportunity to replicate physiological tissue organization and functionality. This study investigates the impact of radiation on skeletal muscle response using an innovative in vitro human 3D skeletal muscle organoids (hSMOs) model derived from hPSCs. METHODS The hSMOs model was established through a differentiation protocol faithfully recapitulating embryonic myogenesis and maturation via paraxial mesodermal differentiation of hPSCs. Key skeletal muscle characteristics were confirmed using immunofluorescent staining and RT-qPCR. Subsequently, the hSMOs were exposed to a clinically relevant dose of 2 Gy of radiation, and their response was analyzed using immunofluorescent staining and RNA-seq. RESULTS The hSMO model faithfully recapitulated embryonic myogenesis and maturation, maintaining key skeletal muscle characteristics. Following exposure to 2 Gy of radiation, histopathological analysis revealed deficits in hSMOs expansion, differentiation, and repair response across various cell types at early (30 min) and intermediate (18 h) time points post-radiation. Immunofluorescent staining targeting γH2AX and 53BP1 demonstrated elevated levels of foci per cell, particularly in PAX7+ cells, during early and intermediate time points, with a distinct kinetic pattern showing a decrease at 72 h. RNA-seq data provided comprehensive insights into the DNA damage response within the hSMOs. CONCLUSIONS Our findings highlight deficits in expansion, differentiation, and repair response in hSMOs following radiation exposure, enhancing our understanding of radiation effects on skeletal muscle and contributing to strategies for mitigating radiation-induced damage in this context.
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Affiliation(s)
- Yifei Jiang
- Department of Microsurgery, Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China; Guangdong Province Engineering Laboratory for Soft Tissue Biofabrication, Guangzhou 510080, China; Guangdong Provincial Peripheral Nerve Tissue Engineering and Technology Research Center, Guangzhou 510080, China; Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, Guangzhou 510080, China
| | - Runtao Zhou
- Department of Microsurgery, Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China; Guangdong Province Engineering Laboratory for Soft Tissue Biofabrication, Guangzhou 510080, China; Guangdong Provincial Peripheral Nerve Tissue Engineering and Technology Research Center, Guangzhou 510080, China; Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, Guangzhou 510080, China
| | - Fawei Liao
- Department of Microsurgery, Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China; Guangdong Province Engineering Laboratory for Soft Tissue Biofabrication, Guangzhou 510080, China; Guangdong Provincial Peripheral Nerve Tissue Engineering and Technology Research Center, Guangzhou 510080, China; Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, Guangzhou 510080, China
| | - Ganggang Kong
- Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, Guangzhou 510080, China; Department of Spine Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - Jingguang Zeng
- Department of Microsurgery, Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China; Guangdong Province Engineering Laboratory for Soft Tissue Biofabrication, Guangzhou 510080, China; Guangdong Provincial Peripheral Nerve Tissue Engineering and Technology Research Center, Guangzhou 510080, China; Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, Guangzhou 510080, China
| | - Yixun Wu
- Department of Microsurgery, Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China; Guangdong Province Engineering Laboratory for Soft Tissue Biofabrication, Guangzhou 510080, China; Guangdong Provincial Peripheral Nerve Tissue Engineering and Technology Research Center, Guangzhou 510080, China; Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, Guangzhou 510080, China
| | - Xubo Li
- Department of Microsurgery, Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China; Guangdong Province Engineering Laboratory for Soft Tissue Biofabrication, Guangzhou 510080, China; Guangdong Provincial Peripheral Nerve Tissue Engineering and Technology Research Center, Guangzhou 510080, China; Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, Guangzhou 510080, China
| | - Bo Wang
- Department of Microsurgery, Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China; Guangdong Province Engineering Laboratory for Soft Tissue Biofabrication, Guangzhou 510080, China; Guangdong Provincial Peripheral Nerve Tissue Engineering and Technology Research Center, Guangzhou 510080, China; Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, Guangzhou 510080, China
| | - Fangze Qi
- Department of Microsurgery, Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China; Guangdong Province Engineering Laboratory for Soft Tissue Biofabrication, Guangzhou 510080, China; Guangdong Provincial Peripheral Nerve Tissue Engineering and Technology Research Center, Guangzhou 510080, China; Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, Guangzhou 510080, China
| | - Shiju Chen
- Department of Microsurgery, Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China; Guangdong Province Engineering Laboratory for Soft Tissue Biofabrication, Guangzhou 510080, China; Guangdong Provincial Peripheral Nerve Tissue Engineering and Technology Research Center, Guangzhou 510080, China; Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, Guangzhou 510080, China
| | - Qintang Zhu
- Department of Microsurgery, Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China; Guangdong Province Engineering Laboratory for Soft Tissue Biofabrication, Guangzhou 510080, China; Guangdong Provincial Peripheral Nerve Tissue Engineering and Technology Research Center, Guangzhou 510080, China; Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, Guangzhou 510080, China
| | - Liqiang Gu
- Department of Microsurgery, Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China; Guangdong Province Engineering Laboratory for Soft Tissue Biofabrication, Guangzhou 510080, China; Guangdong Provincial Peripheral Nerve Tissue Engineering and Technology Research Center, Guangzhou 510080, China; Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, Guangzhou 510080, China
| | - Canbin Zheng
- Department of Microsurgery, Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China; Guangdong Province Engineering Laboratory for Soft Tissue Biofabrication, Guangzhou 510080, China; Guangdong Provincial Peripheral Nerve Tissue Engineering and Technology Research Center, Guangzhou 510080, China; Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, Guangzhou 510080, China.
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Li Q, Liang F, Bhattarai S, Divangahi M, Kaufmann E, Petrof BJ. Dynamic equilibrium of skeletal muscle macrophage ontogeny in the diaphragm during homeostasis, injury, and recovery. Sci Rep 2024; 14:9132. [PMID: 38644379 PMCID: PMC11033281 DOI: 10.1038/s41598-024-59527-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Accepted: 04/11/2024] [Indexed: 04/23/2024] Open
Abstract
The diaphragm is a unique skeletal muscle due to its continuous activation pattern during the act of breathing. The ontogeny of macrophages, pivotal cells for skeletal muscle maintenance and regeneration, is primarily based on two distinct origins: postnatal bone marrow-derived monocytes and prenatal embryonic progenitors. Here we employed chimeric mice to study the dynamics of these two macrophage populations under different conditions. Traditional chimeric mice generated through whole body irradiation showed virtually complete elimination of the original tissue-resident macrophage pool. We then developed a novel method which employs lead shielding to protect the diaphragm tissue niche from irradiation. This allowed us to determine that up to almost half of tissue-resident macrophages in the diaphragm can be maintained independently from bone marrow-derived monocytes under steady-state conditions. These findings were confirmed by long-term (5 months) parabiosis experiments. Acute diaphragm injury shifted the macrophage balance toward an overwhelming predominance of bone marrow (monocyte)-derived macrophages. However, there was a remarkable reversion to the pre-injury ontological landscape after diaphragm muscle recovery. This diaphragm shielding method permits analysis of the dynamics of macrophage origin and corresponding function under different physiological and pathological conditions. It may be especially useful for studying diseases which are characterized by acute or chronic injury of the diaphragm and accompanying inflammation.
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Affiliation(s)
- Qian Li
- Meakins-Christie Laboratories, Translational Research in Respiratory Diseases Program, Research Institute of the McGill University Health Centre, 1001 Decarie Boulevard, EM3.2224, Montreal, QC, H4A 3J1, Canada
| | - Feng Liang
- Meakins-Christie Laboratories, Translational Research in Respiratory Diseases Program, Research Institute of the McGill University Health Centre, 1001 Decarie Boulevard, EM3.2224, Montreal, QC, H4A 3J1, Canada
| | - Salyan Bhattarai
- Meakins-Christie Laboratories, Translational Research in Respiratory Diseases Program, Research Institute of the McGill University Health Centre, 1001 Decarie Boulevard, EM3.2224, Montreal, QC, H4A 3J1, Canada
| | - Maziar Divangahi
- Meakins-Christie Laboratories, Translational Research in Respiratory Diseases Program, Research Institute of the McGill University Health Centre, 1001 Decarie Boulevard, EM3.2224, Montreal, QC, H4A 3J1, Canada
| | - Eva Kaufmann
- Meakins-Christie Laboratories, Translational Research in Respiratory Diseases Program, Research Institute of the McGill University Health Centre, 1001 Decarie Boulevard, EM3.2224, Montreal, QC, H4A 3J1, Canada
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON, Canada
| | - Basil J Petrof
- Meakins-Christie Laboratories, Translational Research in Respiratory Diseases Program, Research Institute of the McGill University Health Centre, 1001 Decarie Boulevard, EM3.2224, Montreal, QC, H4A 3J1, Canada.
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Huot JR, Livingston PD, Pin F, Thomas CR, Jamnick NA, Callaway CS, Bonetto A. Long-term Musculoskeletal Consequences of Chemotherapy in Pediatric Mice. FUNCTION 2024; 5:zqae011. [PMID: 38706958 PMCID: PMC11065107 DOI: 10.1093/function/zqae011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 02/08/2024] [Accepted: 03/04/2024] [Indexed: 05/07/2024] Open
Abstract
Thanks to recent progress in cancer research, most children treated for cancer survive into adulthood. Nevertheless, the long-term consequences of anticancer agents are understudied, especially in the pediatric population. We and others have shown that routinely administered chemotherapeutics drive musculoskeletal alterations, which contribute to increased treatment-related toxicity and long-term morbidity. Yet, the nature and scope of these enduring musculoskeletal defects following anticancer treatments and whether they can potentially impact growth and quality of life in young individuals remain to be elucidated. Here, we aimed at investigating the persistent musculoskeletal consequences of chemotherapy in young (pediatric) mice. Four-week-old male mice were administered a combination of 5-FU, leucovorin, irinotecan (a.k.a., Folfiri) or the vehicle for up to 5 wk. At time of sacrifice, skeletal muscle, bones, and other tissues were collected, processed, and stored for further analyses. In another set of experiments, chemotherapy-treated mice were monitored for up to 4 wk after cessation of treatment. Overall, the growth rate was significantly slower in the chemotherapy-treated animals, resulting in diminished lean and fat mass, as well as significantly smaller skeletal muscles. Interestingly, 4 wk after cessation of the treatment, the animals exposed to chemotherapy showed persistent musculoskeletal defects, including muscle innervation deficits and abnormal mitochondrial homeostasis. Altogether, our data support that anticancer treatments may lead to long-lasting musculoskeletal complications in actively growing pediatric mice and support the need for further studies to determine the mechanisms responsible for these complications, so that new therapies to prevent or diminish chemotherapy-related toxicities can be identified.
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Affiliation(s)
- Joshua R Huot
- Department of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine, Indianapolis, IN, 46202 USA
- Simon Comprehensive Cancer Center, Indiana University School of Medicine, Indianapolis, IN, 46202 USA
- Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202 USA
- Department of Kinesiology, School of Health and Human Sciences, Indiana University Purdue University Indianapolis, IN, 46202 USA
| | - Patrick D Livingston
- Department of Kinesiology, School of Health and Human Sciences, Indiana University Purdue University Indianapolis, IN, 46202 USA
| | - Fabrizio Pin
- Department of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine, Indianapolis, IN, 46202 USA
- Simon Comprehensive Cancer Center, Indiana University School of Medicine, Indianapolis, IN, 46202 USA
- Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202 USA
| | - Connor R Thomas
- Department of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine, Indianapolis, IN, 46202 USA
| | - Nicholas A Jamnick
- Department of Pathology, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045 USA
| | - Chandler S Callaway
- Department of Pathology, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045 USA
| | - Andrea Bonetto
- Department of Pathology, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045 USA
- University of Colorado Comprehensive Cancer Center, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045 USA
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Martynov I, Dhaka L, Wilke B, Hoyer P, Vahdad MR, Seitz G. Contemporary preclinical mouse models for pediatric rhabdomyosarcoma: from bedside to bench to bedside. Front Oncol 2024; 14:1333129. [PMID: 38371622 PMCID: PMC10869630 DOI: 10.3389/fonc.2024.1333129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Accepted: 01/02/2024] [Indexed: 02/20/2024] Open
Abstract
Background Rhabdomyosarcoma (RMS) is the most common pediatric soft-tissue malignancy, characterized by high clinicalopathological and molecular heterogeneity. Preclinical in vivo models are essential for advancing our understanding of RMS oncobiology and developing novel treatment strategies. However, the diversity of scholarly data on preclinical RMS studies may challenge scientists and clinicians. Hence, we performed a systematic literature survey of contemporary RMS mouse models to characterize their phenotypes and assess their translational relevance. Methods We identified papers published between 01/07/2018 and 01/07/2023 by searching PubMed and Web of Science databases. Results Out of 713 records screened, 118 studies (26.9%) were included in the qualitative synthesis. Cell line-derived xenografts (CDX) were the most commonly utilized (n = 75, 63.6%), followed by patient-derived xenografts (PDX) and syngeneic models, each accounting for 11.9% (n = 14), and genetically engineered mouse models (GEMM) (n = 7, 5.9%). Combinations of different model categories were reported in 5.9% (n = 7) of studies. One study employed a virus-induced RMS model. Overall, 40.0% (n = 30) of the studies utilizing CDX models established alveolar RMS (aRMS), while 38.7% (n = 29) were embryonal phenotypes (eRMS). There were 20.0% (n = 15) of studies that involved a combination of both aRMS and eRMS subtypes. In one study (1.3%), the RMS phenotype was spindle cell/sclerosing. Subcutaneous xenografts (n = 66, 55.9%) were more frequently used compared to orthotopic models (n = 29, 24.6%). Notably, none of the employed cell lines were derived from primary untreated tumors. Only a minority of studies investigated disseminated RMS phenotypes (n = 16, 13.6%). The utilization areas of RMS models included testing drugs (n = 64, 54.2%), studying tumorigenesis (n = 56, 47.5%), tumor modeling (n = 19, 16.1%), imaging (n = 9, 7.6%), radiotherapy (n = 6, 5.1%), long-term effects related to radiotherapy (n = 3, 2.5%), and investigating biomarkers (n = 1, 0.8%). Notably, no preclinical studies focused on surgery. Conclusions This up-to-date review highlights the need for mouse models with dissemination phenotypes and cell lines from primary untreated tumors. Furthermore, efforts should be directed towards underexplored areas such as surgery, radiotherapy, and biomarkers.
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Affiliation(s)
- Illya Martynov
- Department of Pediatric Surgery and Urology, University Hospital Giessen-Marburg, Marburg, Germany
- Department of Pediatric Surgery, University Hospital Giessen-Marburg, Giessen, Germany
| | - Lajwanti Dhaka
- Department of Pediatric Surgery and Urology, University Hospital Giessen-Marburg, Marburg, Germany
| | - Benedikt Wilke
- Department of Pediatric Surgery and Urology, University Hospital Giessen-Marburg, Marburg, Germany
| | - Paul Hoyer
- Department of Pediatric Surgery and Urology, University Hospital Giessen-Marburg, Marburg, Germany
| | - M. Reza Vahdad
- Department of Pediatric Surgery and Urology, University Hospital Giessen-Marburg, Marburg, Germany
- Department of Pediatric Surgery, University Hospital Giessen-Marburg, Giessen, Germany
| | - Guido Seitz
- Department of Pediatric Surgery and Urology, University Hospital Giessen-Marburg, Marburg, Germany
- Department of Pediatric Surgery, University Hospital Giessen-Marburg, Giessen, Germany
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Sutcu HH, Rassinoux P, Donnio LM, Neuillet D, Vianna F, Gabillot O, Mari PO, Baldeyron C, Giglia-Mari G. Decline of DNA damage response along with myogenic differentiation. Life Sci Alliance 2024; 7:e202302279. [PMID: 37993260 PMCID: PMC10665522 DOI: 10.26508/lsa.202302279] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 11/15/2023] [Accepted: 11/16/2023] [Indexed: 11/24/2023] Open
Abstract
DNA integrity is incessantly confronted to agents inducing DNA lesions. All organisms are equipped with a network of DNA damage response mechanisms that will repair DNA lesions and restore proper cellular activities. Despite DNA repair mechanisms have been revealed in replicating cells, still little is known about how DNA lesions are repaired in postmitotic cells. Muscle fibers are highly specialized postmitotic cells organized in syncytia and they are vulnerable to age-related degeneration and atrophy after radiotherapy treatment. We have studied the DNA repair capacity of muscle fiber nuclei and compared it with the one measured in proliferative myoblasts here. We focused on the DNA repair mechanisms that correct ionizing radiation (IR)-induced lesions, namely the base excision repair, the nonhomologous end joining, and the homologous recombination (HR). We found that in the most differentiated myogenic cells, myotubes, these DNA repair mechanisms present weakened kinetics of recruitment of DNA repair proteins to IR-damaged DNA. For base excision repair and HR, this decline can be linked to reduced steady-state levels of key proteins involved in these processes.
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Affiliation(s)
- Haser H Sutcu
- https://ror.org/01ha22c77 Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-SANTE/SERAMED/LRAcc, Fontenay-aux-Roses, France
| | - Phoebe Rassinoux
- Pathophysiology and Genetics of Neuron and Muscle (INMG-PGNM) CNRS UMR 5261, INSERM U1315, Université Claude Bernard Lyon 1, Lyon, France
| | - Lise-Marie Donnio
- Pathophysiology and Genetics of Neuron and Muscle (INMG-PGNM) CNRS UMR 5261, INSERM U1315, Université Claude Bernard Lyon 1, Lyon, France
| | - Damien Neuillet
- Pathophysiology and Genetics of Neuron and Muscle (INMG-PGNM) CNRS UMR 5261, INSERM U1315, Université Claude Bernard Lyon 1, Lyon, France
| | - François Vianna
- https://ror.org/01ha22c77 Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-SANTE/SDOS/LMDN, Saint-Paul-Lez-Durance, France
| | - Olivier Gabillot
- https://ror.org/01ha22c77 Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-SANTE/SERAMED/LRAcc, Fontenay-aux-Roses, France
| | - Pierre-Olivier Mari
- Pathophysiology and Genetics of Neuron and Muscle (INMG-PGNM) CNRS UMR 5261, INSERM U1315, Université Claude Bernard Lyon 1, Lyon, France
| | - Céline Baldeyron
- https://ror.org/01ha22c77 Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-SANTE/SERAMED/LRAcc, Fontenay-aux-Roses, France
| | - Giuseppina Giglia-Mari
- Pathophysiology and Genetics of Neuron and Muscle (INMG-PGNM) CNRS UMR 5261, INSERM U1315, Université Claude Bernard Lyon 1, Lyon, France
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Collao N, D'Souza D, Messeiller L, Pilon E, Lloyd J, Larkin J, Ngu M, Cuillerier A, Green AE, Menzies KJ, Burelle Y, De Lisio M. Radiation induces long-term muscle fibrosis and promotes a fibrotic phenotype in fibro-adipogenic progenitors. J Cachexia Sarcopenia Muscle 2023; 14:2335-2349. [PMID: 37671686 PMCID: PMC10570115 DOI: 10.1002/jcsm.13320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 06/29/2023] [Accepted: 07/24/2023] [Indexed: 09/07/2023] Open
Abstract
BACKGROUND Radiation-induced muscle pathology, characterized by muscle atrophy and fibrotic tissue accumulation, is the most common debilitating late effect of therapeutic radiation exposure particularly in juvenile cancer survivors. In healthy muscle, fibro/adipogenic progenitors (FAPs) are required for muscle maintenance and regeneration, while in muscle pathology FAPs are precursors for exacerbated extracellular matrix deposition. However, the role of FAPs in radiation-induced muscle pathology has not previously been explored. METHODS Four-week-old Male CBA or C57Bl/6J mice received a single dose (16 Gy) of irradiation (IR) to a single hindlimb with the shielded contralateral limb (CLTR) serving as a non-IR control. Mice were sacrificed 3, 7, 14 (acute IR response), and 56 days post-IR (long-term IR response). Changes in skeletal muscle morphology, myofibre composition, muscle niche cellular dynamics, DNA damage, proliferation, mitochondrial respiration, and metabolism and changes in progenitor cell fate where assessed. RESULTS Juvenile radiation exposure resulted in smaller myofibre cross-sectional area, particularly in type I and IIA myofibres (P < 0.05) and reduced the proportion of type I myofibres (P < 0.05). Skeletal muscle fibrosis (P < 0.05) was evident at 56 days post-IR. The IR-limb had fewer endothelial cells (P < 0.05) and fibro-adipogenic progenitors (FAPs) (P < 0.05) at 56 days post-IR. Fewer muscle satellite (stem) cells were detected at 3 and 56 days in the IR-limb (P < 0.05). IR induced FAP senescence (P < 0.05), increased their fibrogenic differentiation (P < 0.01), and promoted their glycolytic metabolism. Further, IR altered the FAP secretome in a manner that impaired muscle satellite (stem) cell differentiation (P < 0.05) and fusion (P < 0.05). CONCLUSIONS Our study suggests that following juvenile radiation exposure, FAPs contribute to long-term skeletal muscle atrophy and fibrosis. These findings provide rationale for investigating FAP-targeted therapies to ameliorate the negative late effects of radiation exposure in skeletal muscle.
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Affiliation(s)
- Nicolas Collao
- School of Human Kinetics, Faculty of Health ScienceUniversity of OttawaOttawaCanada
- Éric Poulin Centre for Neuromuscular DiseaseUniversity of OttawaOttawaCanada
| | - Donna D'Souza
- School of Human Kinetics, Faculty of Health ScienceUniversity of OttawaOttawaCanada
| | - Laura Messeiller
- School of Human Kinetics, Faculty of Health ScienceUniversity of OttawaOttawaCanada
| | - Evan Pilon
- School of Human Kinetics, Faculty of Health ScienceUniversity of OttawaOttawaCanada
| | - Jessica Lloyd
- School of Human Kinetics, Faculty of Health ScienceUniversity of OttawaOttawaCanada
| | - Jillian Larkin
- School of Human Kinetics, Faculty of Health ScienceUniversity of OttawaOttawaCanada
| | - Matthew Ngu
- School of Human Kinetics, Faculty of Health ScienceUniversity of OttawaOttawaCanada
| | - Alexanne Cuillerier
- Interdisciplinary School of Health SciencesUniversity of OttawaOttawaCanada
- Department of Biochemistry, Microbiology and Immunology, Ottawa Institute of Systems BiologyUniversity of OttawaOttawaCanada
| | - Alexander E. Green
- Éric Poulin Centre for Neuromuscular DiseaseUniversity of OttawaOttawaCanada
- Interdisciplinary School of Health SciencesUniversity of OttawaOttawaCanada
- Department of Biochemistry, Microbiology and Immunology, Ottawa Institute of Systems BiologyUniversity of OttawaOttawaCanada
| | - Keir J. Menzies
- Éric Poulin Centre for Neuromuscular DiseaseUniversity of OttawaOttawaCanada
- Interdisciplinary School of Health SciencesUniversity of OttawaOttawaCanada
- Department of Biochemistry, Microbiology and Immunology, Ottawa Institute of Systems BiologyUniversity of OttawaOttawaCanada
| | - Yan Burelle
- Interdisciplinary School of Health SciencesUniversity of OttawaOttawaCanada
| | - Michael De Lisio
- School of Human Kinetics, Faculty of Health ScienceUniversity of OttawaOttawaCanada
- Éric Poulin Centre for Neuromuscular DiseaseUniversity of OttawaOttawaCanada
- Department of Cellular and Molecular Medicine, Regenerative Medicine ProgramUniversity of OttawaOttawaCanada
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7
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Heezen LGM, Abdelaal T, van Putten M, Aartsma-Rus A, Mahfouz A, Spitali P. Spatial transcriptomics reveal markers of histopathological changes in Duchenne muscular dystrophy mouse models. Nat Commun 2023; 14:4909. [PMID: 37582915 PMCID: PMC10427630 DOI: 10.1038/s41467-023-40555-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Accepted: 08/02/2023] [Indexed: 08/17/2023] Open
Abstract
Duchenne muscular dystrophy is caused by mutations in the DMD gene, leading to lack of dystrophin. Chronic muscle damage eventually leads to histological alterations in skeletal muscles. The identification of genes and cell types driving tissue remodeling is a key step to developing effective therapies. Here we use spatial transcriptomics in two Duchenne muscular dystrophy mouse models differing in disease severity to identify gene expression signatures underlying skeletal muscle pathology and to directly link gene expression to muscle histology. We perform deconvolution analysis to identify cell types contributing to histological alterations. We show increased expression of specific genes in areas of muscle regeneration (Myl4, Sparc, Hspg2), fibrosis (Vim, Fn1, Thbs4) and calcification (Bgn, Ctsk, Spp1). These findings are confirmed by smFISH. Finally, we use differentiation dynamic analysis in the D2-mdx muscle to identify muscle fibers in the present state that are predicted to become affected in the future state.
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Affiliation(s)
- L G M Heezen
- Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - T Abdelaal
- Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands
- Systems and Biomedical Engineering Department, Faculty of Engineering Cairo University, Giza, Egypt
- Delft Bioinformatics Lab, Delft University of Technology, Delft, The Netherlands
| | - M van Putten
- Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - A Aartsma-Rus
- Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - A Mahfouz
- Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
- Delft Bioinformatics Lab, Delft University of Technology, Delft, The Netherlands
- Leiden Computational Biology Center, Leiden University Medical Center, Leiden, The Netherlands
| | - P Spitali
- Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands.
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8
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Liu H, Ke S, Xie M, Niu Z, Liu H, Li J, Tang A, Xia W, He G. The regulation of expression and splicing of transcription factors are related to the muscle damage caused by radiation in tree shrews. Biochem Biophys Res Commun 2023; 668:125-132. [PMID: 37247592 DOI: 10.1016/j.bbrc.2023.05.078] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 05/10/2023] [Accepted: 05/20/2023] [Indexed: 05/31/2023]
Abstract
Radiotherapy-induced muscle injury (RIMI) is a major complication of radiotherapy for nasopharyngeal carcinoma. Transcription factor (TF) expression and alternative splicing are crucial events in transcriptional and posttranscriptional regulation, respectively, and are known to be involved in key signaling pathways contributing to a variety of human disorders, including radiation injury. To investigate the TFs and alternative splicing events involved in RIMI, we constructed a tree shrew model as described previously in which the RIMI group received 20 Gy of irradiation on the tensor veli palatini (TVP) muscles. The irradiated muscles were evaluated by RNA sequencing (RNA-seq) 6 months later, and the results compared with those for normal TVP muscles. The alt5p and alt3p events were the two main types of differentially regulated alternative splicing events (RASEs) identified via the Splice sites Usage Variation Analysis (SUVA) software, and these RASEs were highly conserved in RIMI. According to functional enrichment analysis, the differentially RASEs were primarily enriched in pathways related to transcriptional regulation. Furthermore, we identified 16 alternative splicing TFs (ASTFs) in ASTF-differentially expressed gene (DEG) networks based on co-expression analysis, and the regulatory networks were chiefly enriched in pathways linked to cell proliferation and differentiation. This study revealed that RASEs and ASTF-DEG networks may both play important regulatory roles in gene expression network alteration in RIMI. Future studies on the targeting mechanisms and early interventions directed at RASEs and ASTF-DEG networks may aid in the treatment of RIMI.
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Affiliation(s)
- Heng Liu
- School of Information and Management, Guangxi Medical University, Nanning, 530021, China; Institute of Data Science, City University of Macau, Macao, 999078, China
| | - Shenghui Ke
- Department of Otorhinolaryngology Head and Neck Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, 530021, China; Key Laboratory of Early Prevention and Treatment for Regional High Frequency Tumor, Gaungxi Medical University, Ministry of Education, Nanning, Guangxi, 530021, China
| | - Mao Xie
- Department of Otorhinolaryngology Head and Neck Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, 530021, China; Key Laboratory of Early Prevention and Treatment for Regional High Frequency Tumor, Gaungxi Medical University, Ministry of Education, Nanning, Guangxi, 530021, China
| | - Zhijie Niu
- Department of Otorhinolaryngology Head and Neck Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, 530021, China; Key Laboratory of Early Prevention and Treatment for Regional High Frequency Tumor, Gaungxi Medical University, Ministry of Education, Nanning, Guangxi, 530021, China
| | - Huayu Liu
- Department of Otorhinolaryngology Head and Neck Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, 530021, China; Key Laboratory of Early Prevention and Treatment for Regional High Frequency Tumor, Gaungxi Medical University, Ministry of Education, Nanning, Guangxi, 530021, China
| | - Jingyu Li
- Department of Otorhinolaryngology Head and Neck Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, 530021, China; Key Laboratory of Early Prevention and Treatment for Regional High Frequency Tumor, Gaungxi Medical University, Ministry of Education, Nanning, Guangxi, 530021, China
| | - Anzhou Tang
- Department of Otorhinolaryngology Head and Neck Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, 530021, China; Key Laboratory of Early Prevention and Treatment for Regional High Frequency Tumor, Gaungxi Medical University, Ministry of Education, Nanning, Guangxi, 530021, China
| | - Wei Xia
- Department of Otorhinolaryngology Head and Neck Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, 530021, China; Key Laboratory of Early Prevention and Treatment for Regional High Frequency Tumor, Gaungxi Medical University, Ministry of Education, Nanning, Guangxi, 530021, China.
| | - Guangyao He
- Department of Otorhinolaryngology Head and Neck Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, 530021, China; Key Laboratory of Early Prevention and Treatment for Regional High Frequency Tumor, Gaungxi Medical University, Ministry of Education, Nanning, Guangxi, 530021, China.
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Collao N, Sanders O, Caminiti T, Messeiller L, De Lisio M. Resistance and endurance exercise training improves muscle mass and the inflammatory/fibrotic transcriptome in a rhabdomyosarcoma model. J Cachexia Sarcopenia Muscle 2023; 14:781-793. [PMID: 36797054 PMCID: PMC10067492 DOI: 10.1002/jcsm.13185] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 12/14/2022] [Accepted: 01/16/2023] [Indexed: 02/18/2023] Open
Abstract
BACKGROUND Rhabdomyosarcoma (RMS) is an aggressive soft tissue sarcoma that most often develops in children. Chemoradiation therapy is a standard treatment modality; however, the detrimental long-term skeletal muscle consequences of this therapy in juvenile cancer survivors include muscle atrophy and fibrosis resulting in decreased physical performance. Using a novel model of murine resistance and endurance exercise training, we investigate its role in preventing the long-term effects of juvenile RMS plus therapy. METHODS Four-week-old male (n = 10) and female (n = 10) C57Bl/6J mice were injected with M3-9-M RMS cell into the left gastrocnemius with the right limb serving as an internal control (CON). Mice received a systemic vincristine injection and then five doses of 4.8 Gy of gamma radiation localized to the left hindlimb (RMS + Tx). Mice were then randomly divided into either sedentary (SED) or resistance and endurance exercise training (RET) groups. Changes in exercise performance, body composition, myocellular adaptations and the inflammatory/fibrotic transcriptome were assessed. RESULTS RET improved endurance performance (P < 0.0001) and body composition (P = 0.0004) compared to SED. RMS + Tx resulted in significantly lower muscle weight (P = 0.015) and significantly smaller myofibre cross-sectional area (CSA) (P = 0.014). Conversely, RET resulted in significantly higher muscle weight (P = 0.030) and significantly larger Type IIA (P = 0.014) and IIB (P = 0.015) fibre CSA. RMS + Tx resulted in significantly more muscle fibrosis (P = 0.028), which was not prevented by RET. RMS + Tx resulted in significantly fewer mononuclear cells (P < 0.05) and muscle satellite (stem) cells (MuSCs) (P < 0.05) and significantly more immune cells (P < 0.05) than CON. RET resulted in significantly more fibro-adipogenic progenitors (P < 0.05), a trend for more MuSCs (P = 0.076) than SED and significantly more endothelial cells specifically in the RMS + Tx limb. Transcriptomic changes revealed significantly higher expression of inflammatory and fibrotic genes in RMS + Tx, which was prevented by RET. In the RMS + Tx model, RET also significantly altered expression of genes involved in extracellular matrix turnover. CONCLUSIONS Our study suggests that RET preserves muscle mass and performance in a model of juvenile RMS survivorship while partially restoring cellular dynamics and the inflammatory and fibrotic transcriptome.
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Affiliation(s)
- Nicolas Collao
- School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada
| | - Olivia Sanders
- School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada
| | - Taylor Caminiti
- School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada
| | - Laura Messeiller
- School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada
| | - Michael De Lisio
- School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada.,Department of Cellular and Molecular Medicine, Regenerative Medicine Program, University of Ottawa, Ottawa, Ontario, Canada
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Runco DV, Zimmers TA, Bonetto A. The urgent need to improve childhood cancer cachexia. Trends Cancer 2022; 8:976-979. [PMID: 35931609 PMCID: PMC10029855 DOI: 10.1016/j.trecan.2022.07.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 07/11/2022] [Accepted: 07/14/2022] [Indexed: 01/27/2023]
Abstract
Clinical care and research around cancer cachexia in children is lacking. Cachexia increases treatment-related toxicity and long-term morbidity and potentially affects mortality. We highlight the urgent need for specific focus on childhood cancer cachexia and discuss potential solutions to inform cachexia therapeutics for children.
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Affiliation(s)
- Daniel V Runco
- Department of Pediatrics, Indiana University School of Medicine, Riley Hospital for Children at IU Health, Indianapolis, IN, USA; Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, USA; Indiana University Melvin and Bren Simon Comprehensive Cancer Center, Indiana University School of Medicine, Indianapolis, IN, USA.
| | - Teresa A Zimmers
- Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, USA; Indiana University Melvin and Bren Simon Comprehensive Cancer Center, Indiana University School of Medicine, Indianapolis, IN, USA; Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, USA; Department of Otolaryngology - Head & Neck Surgery, Indiana University School of Medicine, Indianapolis, IN, USA; Department of Anatomy, Cell Biology, and Physiology, Indiana University School of Medicine, Indianapolis, IN, USA; Richard L Roudebush Veterans Administration Medical Center, Indianapolis, IN, USA
| | - Andrea Bonetto
- Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, USA; Indiana University Melvin and Bren Simon Comprehensive Cancer Center, Indiana University School of Medicine, Indianapolis, IN, USA; Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, USA; Department of Otolaryngology - Head & Neck Surgery, Indiana University School of Medicine, Indianapolis, IN, USA; Department of Anatomy, Cell Biology, and Physiology, Indiana University School of Medicine, Indianapolis, IN, USA; Department of Pathology, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.
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11
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Fukuzawa T, Natsume T, Tamaki M, Imai T, Yamato I, Tamaki T. Quantitative Evaluation of the Reduced Capacity of Skeletal Muscle Hypertrophy after Total Body Irradiation in Relation to Stem/Progenitor Cells. J Clin Med 2022; 11:jcm11133735. [PMID: 35807021 PMCID: PMC9267799 DOI: 10.3390/jcm11133735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 06/13/2022] [Accepted: 06/27/2022] [Indexed: 11/16/2022] Open
Abstract
The effects of total body irradiation (TBI) to the capacity of skeletal muscle hypertrophy were quantified using the compensatory muscle hypertrophy model. We additionally assessed the responses of stem and/or progenitor cells in the muscles. A single TBI of 9.0, 5.0 and 2.5 Gy was delivered to C57BL/6 mice. Bone marrow stromal cells were obtained from GFP-Tg mice, and were injected into the tail vein of the recipient mice (1 × 106 cells/mouse), for bone marrow transplantation (BMT). Five weeks after TBI, the mean GFP-chimerism in the blood was 96 ± 0.8% in the 9 Gy, 83 ± 3.9% in the 5 Gy, and 8.4 ± 3.4% in the 2.5 Gy groups. This implied that the impact of 2.5 Gy is quite low and unavailable as the BMT treatment. Six weeks after the TBI/BMT procedure, muscle hypertrophy was induced in the right plantaris muscle by surgical ablation (SA) of the synergist muscles (gastrocnemius and soleus), and the contralateral left side was preserved as a control. The muscle hypertrophy capacity significantly decreased by 95% in the 9 Gy, 48% in the 5 Gy, and 36% in the 2.5 Gy groups. Furthermore, stem/progenitor cells in the muscle were enzymatically isolated and fractionated into non-sorted bulk cells, CD45-/34-/29+ (Sk-DN), and CD45-/34+ (Sk-34) cells, and myogenic capacity was confirmed by the presence of Pax7+ and MyoD+ cells in culture. Myogenic capacity also declined significantly in the Bulk and Sk-DN cell groups in all three TBI conditions, possibly implying that skeletal muscles are more susceptible to TBI than bone marrow. However, interstitial Sk-34 cells were insusceptible to TBI, retaining their myogenic/proliferative capacity.
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Affiliation(s)
- Tsuyoshi Fukuzawa
- Department of Radiation Oncology, Tokai University School of Medicine, 143 Shimokasuya, Isehara 259-1193, Kanagawa, Japan;
- Muscle Physiology & Cell Biology Unit, Tokai University School of Medicine, 143 Shimokasuya, Isehara 259-1193, Kanagawa, Japan; (T.N.); (M.T.); (T.I.); (I.Y.)
| | - Toshiharu Natsume
- Muscle Physiology & Cell Biology Unit, Tokai University School of Medicine, 143 Shimokasuya, Isehara 259-1193, Kanagawa, Japan; (T.N.); (M.T.); (T.I.); (I.Y.)
- Department of Physiology, Tokai University School of Medicine, 143 Shimokasuya, Isehara 259-1193, Kanagawa, Japan
| | - Miyu Tamaki
- Muscle Physiology & Cell Biology Unit, Tokai University School of Medicine, 143 Shimokasuya, Isehara 259-1193, Kanagawa, Japan; (T.N.); (M.T.); (T.I.); (I.Y.)
- Department of Orthopedic Surgery, Tokai University School of Medicine, 143 Shimokasuya, Isehara 259-1193, Kanagawa, Japan
| | - Takeshi Imai
- Muscle Physiology & Cell Biology Unit, Tokai University School of Medicine, 143 Shimokasuya, Isehara 259-1193, Kanagawa, Japan; (T.N.); (M.T.); (T.I.); (I.Y.)
- Department of Orthopedic Surgery, Tokai University School of Medicine, 143 Shimokasuya, Isehara 259-1193, Kanagawa, Japan
| | - Ippei Yamato
- Muscle Physiology & Cell Biology Unit, Tokai University School of Medicine, 143 Shimokasuya, Isehara 259-1193, Kanagawa, Japan; (T.N.); (M.T.); (T.I.); (I.Y.)
- Department of Medical Education, Tokai University School of Medicine, 143 Shimokasuya, Isehara 259-1193, Kanagawa, Japan
| | - Tetsuro Tamaki
- Muscle Physiology & Cell Biology Unit, Tokai University School of Medicine, 143 Shimokasuya, Isehara 259-1193, Kanagawa, Japan; (T.N.); (M.T.); (T.I.); (I.Y.)
- Department of Physiology, Tokai University School of Medicine, 143 Shimokasuya, Isehara 259-1193, Kanagawa, Japan
- Correspondence: ; Tel.: +81-463-93-22-1121
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12
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O'Connor TN, Kallenbach JG, Orciuoli HM, Paris ND, Bachman JF, Johnston CJ, Hernady E, Williams JP, Dirksen RT, Chakkalakal JV. Endurance exercise attenuates juvenile irradiation-induced skeletal muscle functional decline and mitochondrial stress. Skelet Muscle 2022; 12:8. [PMID: 35414122 PMCID: PMC9004104 DOI: 10.1186/s13395-022-00291-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 04/05/2022] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND Radiotherapy is commonly used to treat childhood cancers and can have adverse effects on muscle function, but the underlying mechanisms have yet to be fully elucidated. We hypothesized that endurance exercise following radiation treatment would improve skeletal muscle function. METHODS We utilized the Small Animal Radiation Research Platform (SARRP) to irradiate juvenile male mice with a clinically relevant fractionated dose of 3× (every other day over 5 days) 8.2 Gy X-ray irradiation locally from the knee to footpad region of the right hindlimb. Mice were then singly housed for 1 month in cages equipped with either locked or free-spinning voluntary running wheels. Ex vivo muscle contractile function, RT-qPCR analyses, resting cytosolic and sarcoplasmic reticulum (SR) store Ca2+ levels, mitochondrial reactive oxygen species levels (MitoSOX), and immunohistochemical and biochemical analyses of muscle samples were conducted to assess the muscle pathology and the relative therapeutic impact of voluntary wheel running (VWR). RESULTS Irradiation reduced fast-twitch extensor digitorum longus (EDL) muscle-specific force by 27% compared to that of non-irradiated mice, while VWR post-irradiation improved muscle-specific force by 37%. Radiation treatment similarly reduced slow-twitch soleus muscle-specific force by 14% compared to that of non-irradiated mice, while VWR post-irradiation improved specific force by 18%. We assessed intracellular Ca2+ regulation, oxidative stress, and mitochondrial homeostasis as potential mechanisms of radiation-induced pathology and exercise-mediated rescue. We found a significant reduction in resting cytosolic Ca2+ concentration following irradiation in sedentary mice. Intriguingly, however, SR Ca2+ store content was increased in myofibers from irradiated mice post-VWR compared to mice that remained sedentary. We observed a 73% elevation in the overall protein oxidization in muscle post-irradiation, while VWR reduced protein nitrosylation by 35% and mitochondrial reactive oxygen species (ROS) production by 50%. Finally, we found that VWR significantly increased the expression of PGC1α at both the transcript and protein levels, consistent with an exercise-dependent increase in mitochondrial biogenesis. CONCLUSIONS Juvenile irradiation stunted muscle development, disrupted proper Ca2+ handling, damaged mitochondria, and increased oxidative and nitrosative stress, paralleling significant deficits in muscle force production. Exercise mitigated aberrant Ca2+ handling, mitochondrial homeostasis, and increased oxidative and nitrosative stress in a manner that correlated with improved skeletal muscle function after radiation.
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Affiliation(s)
- Thomas N O'Connor
- Department of Biomedical Genetics, Genetics, Development and Stem Cells Graduate Program, University of Rochester Medical Center, Rochester, NY, USA
- Department of Pharmacology and Physiology, University of Rochester Medical Center, Rochester, NY, USA
| | - Jacob G Kallenbach
- Department of Pharmacology and Physiology, University of Rochester Medical Center, Rochester, NY, USA
- Department of Biomedical Engineering, University of Rochester Medical Center, Rochester, NY, USA
| | - Haley M Orciuoli
- Department of Pharmacology and Physiology, University of Rochester Medical Center, Rochester, NY, USA
- Department of Biology, Biological Sciences, University of Rochester, Rochester, NY, USA
| | - Nicole D Paris
- Department of Pharmacology and Physiology, University of Rochester Medical Center, Rochester, NY, USA
| | - John F Bachman
- Department of Pharmacology and Physiology, University of Rochester Medical Center, Rochester, NY, USA
- Department of Pathology and Laboratory Medicine, Cell Biology of Disease Graduate Program, University of Rochester Medical Center, Rochester, NY, USA
| | - Carl J Johnston
- Department of Pediatrics, University of Rochester Medical Center, Rochester, NY, USA
| | - Eric Hernady
- Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, USA
| | - Jacqueline P Williams
- Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, USA
| | - Robert T Dirksen
- Department of Pharmacology and Physiology, University of Rochester Medical Center, Rochester, NY, USA
| | - Joe V Chakkalakal
- Department of Pharmacology and Physiology, University of Rochester Medical Center, Rochester, NY, USA.
- Department of Biomedical Engineering, University of Rochester Medical Center, Rochester, NY, USA.
- Department of Orthopaedic Surgery and Cell Biology, Duke University, Durham, NC, USA.
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