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Tatarenko Y, Li M, Pouletaut P, Kammoun M, Hawse JR, Joumaa V, Herzog W, Chatelin S, Bensamoun SF. Multiscale analysis of Klf10's impact on the passive mechanical properties of murine skeletal muscle. J Mech Behav Biomed Mater 2024; 150:106298. [PMID: 38096609 DOI: 10.1016/j.jmbbm.2023.106298] [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: 01/13/2023] [Revised: 09/19/2023] [Accepted: 12/02/2023] [Indexed: 01/09/2024]
Abstract
Skeletal muscle is a hierarchical structure composed of multiple organizational scales. A major challenge in the biomechanical evaluation of muscle relates to the difficulty in evaluating the experimental mechanical properties at the different organizational levels of the same tissue. Indeed, the ability to integrate mechanical properties evaluated at various levels will allow for improved assessment of the entire tissue, leading to a better understanding of how changes at each level evolve over time and/or impact tissue function, especially in the case of muscle diseases. Therefore, the purpose of this study was to analyze a genetically engineered mouse model (Klf10 KO: Krüppel-Like Factor 10 knockout) with known skeletal muscle defects to compare the mechanical properties with wild-type (WT) controls at the three main muscle scales: the macroscopic (whole muscle), microscopic (fiber) and submicron (myofibril) levels. Passive mechanical tests (ramp, relaxation) were performed on two types of skeletal muscle (soleus and extensor digitorum longus (EDL)). Results of the present study revealed muscle-type specific behaviors in both genotypes only at the microscopic scale. Interestingly, loss of Klf10 expression resulted in increased passive properties in the soleus but decreased passive properties in the EDL compared to WT controls. At the submicron scale, no changes were observed between WT and Klf10 KO myofibrils for either muscle; these results demonstrate that the passive property differences observed at the microscopic scale (fiber) are not caused by sarcomere intrinsic alterations but instead must originate outside the sarcomeres, likely in the collagen-based extracellular matrix. The macroscopic scale revealed similar passive mechanical properties between WT and Klf10 KO hindlimb muscles. The present study has allowed for a better understanding of the role of Klf10 on the passive mechanical properties of skeletal muscle and has provided reference data to the literature which could be used by the community for muscle multiscale modeling.
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Affiliation(s)
- Y Tatarenko
- Sorbonne University, Université de Technologie de Compiègne, CNRS UMR 7338, Biomechanics and Bioengineering, Compiègne, France; ICube, CNRS UMR 7357, University of Strasbourg, Strasbourg, France
| | - M Li
- University of Calgary, Faculty of Kinesiology, Human Performance Laboratory, Calgary, Alberta, Canada
| | - P Pouletaut
- Sorbonne University, Université de Technologie de Compiègne, CNRS UMR 7338, Biomechanics and Bioengineering, Compiègne, France
| | - M Kammoun
- Sorbonne University, Université de Technologie de Compiègne, CNRS UMR 7338, Biomechanics and Bioengineering, Compiègne, France
| | - J R Hawse
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN, USA
| | - V Joumaa
- University of Calgary, Faculty of Kinesiology, Human Performance Laboratory, Calgary, Alberta, Canada
| | - W Herzog
- University of Calgary, Faculty of Kinesiology, Human Performance Laboratory, Calgary, Alberta, Canada
| | - S Chatelin
- ICube, CNRS UMR 7357, University of Strasbourg, Strasbourg, France
| | - S F Bensamoun
- Sorbonne University, Université de Technologie de Compiègne, CNRS UMR 7338, Biomechanics and Bioengineering, Compiègne, France.
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Mao Y, Zhang J, Zhou Q, He X, Zheng Z, Wei Y, Zhou K, Lin Y, Yu H, Zhang H, Zhou Y, Lin P, Wu B, Yuan Y, Zhao J, Xu W, Zhao S. Hypoxia induces mitochondrial protein lactylation to limit oxidative phosphorylation. Cell Res 2024; 34:13-30. [PMID: 38163844 PMCID: PMC10770133 DOI: 10.1038/s41422-023-00864-6] [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: 03/10/2023] [Accepted: 08/01/2023] [Indexed: 01/03/2024] Open
Abstract
Oxidative phosphorylation (OXPHOS) consumes oxygen to produce ATP. However, the mechanism that balances OXPHOS activity and intracellular oxygen availability remains elusive. Here, we report that mitochondrial protein lactylation is induced by intracellular hypoxia to constrain OXPHOS. We show that mitochondrial alanyl-tRNA synthetase (AARS2) is a protein lysine lactyltransferase, whose proteasomal degradation is enhanced by proline 377 hydroxylation catalyzed by the oxygen-sensing hydroxylase PHD2. Hypoxia induces AARS2 accumulation to lactylate PDHA1 lysine 336 in the pyruvate dehydrogenase complex and carnitine palmitoyltransferase 2 (CPT2) lysine 457/8, inactivating both enzymes and inhibiting OXPHOS by limiting acetyl-CoA influx from pyruvate and fatty acid oxidation, respectively. PDHA1 and CPT2 lactylation can be reversed by SIRT3 to activate OXPHOS. In mouse muscle cells, lactylation is induced by lactate oxidation-induced intracellular hypoxia during exercise to constrain high-intensity endurance running exhaustion time, which can be increased or decreased by decreasing or increasing lactylation levels, respectively. Our results reveal that mitochondrial protein lactylation integrates intracellular hypoxia and lactate signals to regulate OXPHOS.
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Affiliation(s)
- Yunzi Mao
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodeling and Health, State Key Laboratory of Genetic Engineering, School of Life Sciences, Children's Hospital of Fudan University, and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - Jiaojiao Zhang
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodeling and Health, State Key Laboratory of Genetic Engineering, School of Life Sciences, Children's Hospital of Fudan University, and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - Qian Zhou
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodeling and Health, State Key Laboratory of Genetic Engineering, School of Life Sciences, Children's Hospital of Fudan University, and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - Xiadi He
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodeling and Health, State Key Laboratory of Genetic Engineering, School of Life Sciences, Children's Hospital of Fudan University, and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA, USA
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA, USA
| | - Zhifang Zheng
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodeling and Health, State Key Laboratory of Genetic Engineering, School of Life Sciences, Children's Hospital of Fudan University, and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - Yun Wei
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodeling and Health, State Key Laboratory of Genetic Engineering, School of Life Sciences, Children's Hospital of Fudan University, and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA, USA
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA, USA
| | - Kaiqiang Zhou
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodeling and Health, State Key Laboratory of Genetic Engineering, School of Life Sciences, Children's Hospital of Fudan University, and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - Yan Lin
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodeling and Health, State Key Laboratory of Genetic Engineering, School of Life Sciences, Children's Hospital of Fudan University, and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
- NHC Key Lab of Reproduction Regulation (Shanghai Institute of Planned Parenthood Research), Shanghai, China
- Shanghai Fifth People's Hospital of Fudan University, Fudan University, Shanghai, China
| | - Haowen Yu
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodeling and Health, State Key Laboratory of Genetic Engineering, School of Life Sciences, Children's Hospital of Fudan University, and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - Haihui Zhang
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodeling and Health, State Key Laboratory of Genetic Engineering, School of Life Sciences, Children's Hospital of Fudan University, and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - Yineng Zhou
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodeling and Health, State Key Laboratory of Genetic Engineering, School of Life Sciences, Children's Hospital of Fudan University, and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - Pengcheng Lin
- Key Laboratory for Tibet Plateau Phytochemistry of Qinghai Province, College of Pharmacy, Qinghai University for Nationalities, Xining, Qinghai, China
| | - Baixing Wu
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Guangdong-Hong Kong Joint Laboratory for RNA Medicine, RNA Biomedical Institute, Medical Research Center, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, Guangdong, China
| | - Yiyuan Yuan
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodeling and Health, State Key Laboratory of Genetic Engineering, School of Life Sciences, Children's Hospital of Fudan University, and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
- NHC Key Lab of Reproduction Regulation (Shanghai Institute of Planned Parenthood Research), Shanghai, China
| | - Jianyuan Zhao
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodeling and Health, State Key Laboratory of Genetic Engineering, School of Life Sciences, Children's Hospital of Fudan University, and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
- NHC Key Lab of Reproduction Regulation (Shanghai Institute of Planned Parenthood Research), Shanghai, China
| | - Wei Xu
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodeling and Health, State Key Laboratory of Genetic Engineering, School of Life Sciences, Children's Hospital of Fudan University, and Institutes of Biomedical Sciences, Fudan University, Shanghai, China.
- NHC Key Lab of Reproduction Regulation (Shanghai Institute of Planned Parenthood Research), Shanghai, China.
- Shanghai Fifth People's Hospital of Fudan University, Fudan University, Shanghai, China.
| | - Shimin Zhao
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodeling and Health, State Key Laboratory of Genetic Engineering, School of Life Sciences, Children's Hospital of Fudan University, and Institutes of Biomedical Sciences, Fudan University, Shanghai, China.
- NHC Key Lab of Reproduction Regulation (Shanghai Institute of Planned Parenthood Research), Shanghai, China.
- Key Laboratory for Tibet Plateau Phytochemistry of Qinghai Province, College of Pharmacy, Qinghai University for Nationalities, Xining, Qinghai, China.
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Luo HY, Zhu JY, Chen M, Mu WJ, Guo L. Krüppel-like factor 10 (KLF10) as a critical signaling mediator: Versatile functions in physiological and pathophysiological processes. Genes Dis 2022. [DOI: 10.1016/j.gendis.2022.06.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Kammoun M, Nadal-Desbarats L, Même S, Lafoux A, Huchet C, Meyer-Dilhet G, Courchet J, Montigny F, Szeremeta F, Même W, Veksler V, Piquereau J, Pouletaut P, Subramaniam M, Hawse JR, Constans JM, Bensamoun SF. Deciphering the Role of Klf10 in the Cerebellum. JOURNAL OF BIOMEDICAL SCIENCE AND ENGINEERING 2022; 15:140-156. [PMID: 36507464 PMCID: PMC9733405 DOI: 10.4236/jbise.2022.155014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Recent studies have demonstrated a new role for Klf10, a Krüppel-like transcription factor, in skeletal muscle, specifically relating to mitochondrial function. Thus, it was of interest to analyze additional tissues that are highly reliant on optimal mitochondrial function such as the cerebellum and to decipher the role of Klf10 in the functional and structural properties of this brain region. In vivo (magnetic resonance imaging and localized spectroscopy, behavior analysis) and in vitro (histology, spectroscopy analysis, enzymatic activity) techniques were applied to comprehensively assess the cerebellum of wild type (WT) and Klf10 knockout (KO) mice. Histology analysis and assessment of locomotion revealed no significant difference in Klf10 KO mice. Diffusion and texture results obtained using MRI revealed structural changes in KO mice characterized as defects in the organization of axons. These modifications may be explained by differences in the levels of specific metabolites (myo-inositol, lactate) within the KO cerebellum. Loss of Klf10 expression also led to changes in mitochondrial activity as reflected by a significant increase in the activity of citrate synthase, complexes I and IV. In summary, this study has provided evidence that Klf10 plays an important role in energy production and mitochondrial function in the cerebellum.
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Affiliation(s)
- Malek Kammoun
- Biomechanics and Bioengineering CNRS UMR 7338, Sorbonne University—University of Technology of Compiègne, Compiègne, France
| | | | - Sandra Même
- Center for Molecular Biophysics, CNRS UPR4301, Orléans, France
| | - Aude Lafoux
- Therassay Platform, University of Nantes, Nantes, France
| | | | | | - Julien Courchet
- CNRS UMR-5310 and INSERM U-1217, NeuroMyoGène Institute, Villeurbanne, France
| | | | | | - William Même
- Center for Molecular Biophysics, CNRS UPR4301, Orléans, France
| | - Vladimir Veksler
- INSERM UMR-S 1180, University of Paris-Saclay, Châtenay-Malabry, France
| | - Jérôme Piquereau
- INSERM UMR-S 1180, University of Paris-Saclay, Châtenay-Malabry, France
| | - Philippe Pouletaut
- Biomechanics and Bioengineering CNRS UMR 7338, Sorbonne University—University of Technology of Compiègne, Compiègne, France
| | | | - John R. Hawse
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, USA
| | | | - Sabine F. Bensamoun
- Biomechanics and Bioengineering CNRS UMR 7338, Sorbonne University—University of Technology of Compiègne, Compiègne, France
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Kammoun M, Pouletaut P, Morandat S, Subramaniam M, Hawse JR, Bensamoun SF. Krüppel-like factor 10 regulates the contractile properties of skeletal muscle fibers in mice. Muscle Nerve 2021; 64:765-769. [PMID: 34486132 DOI: 10.1002/mus.27412] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Revised: 08/30/2021] [Accepted: 08/31/2021] [Indexed: 11/07/2022]
Abstract
INTRODUCTION/AIMS Klf10 is a member of the Krüppel-like family of transcription factors, which is implicated in mediating muscle structure (fiber size, organization of the sarcomere), muscle metabolic activity (respiratory chain), and passive force. The aim of this study was to further characterize the roles of Klf10 in the contractile properties of skeletal muscle fibers. METHODS Fifty-two single fibers were extracted from female wild-type (WT) and Klf10 knockout (KO) oxidative (soleus) and glycolytic (extensor digitorum longus [EDL]) skinned muscles. Each fiber was immersed successively in relaxing (R), washing (W), and activating (A) solutions. Calcium was included in the activating solution to induce a maximum contraction of the fiber. The maximum force (Fmax ) was measured and normalized to the cross-sectional area to obtain the maximum stress (Stressmax ). After a steady state in contraction was reached, a quick stretch-release was performed; the force at the maximum stretch (Fstretch ) was measured and the stiffness was assessed. RESULTS Deletion of the Klf10 gene induced changes in the contractile parameters (Fmax , Stressmax , Stiffness), which were lower and higher for soleus and EDL fibers compared with littermates, respectively. These measurements also revealed changes in the proportion and resistance of attached cross-bridges. DISCUSSION Klf10 plays a major role in the homeostasis of the contractile behavior of skeletal muscle fibers in a muscle fiber type-specific manner. These findings further implicate important roles for Klf10 in skeletal muscle function and shed new light on understanding the molecular processes regulating the contractility of skeletal muscle fibers.
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Affiliation(s)
- Malek Kammoun
- Biomechanics and Bioengineering, Centre de recherche Royallieu, Université de technologie de Compiègne, Compiègne Cedex, France
| | - Philippe Pouletaut
- Biomechanics and Bioengineering, Centre de recherche Royallieu, Université de technologie de Compiègne, Compiègne Cedex, France
| | - Sandrine Morandat
- Biomechanics and Bioengineering, Centre de recherche Royallieu, Université de technologie de Compiègne, Compiègne Cedex, France
| | - Malayannan Subramaniam
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, USA
| | - John R Hawse
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, USA
| | - Sabine F Bensamoun
- Biomechanics and Bioengineering, Centre de recherche Royallieu, Université de technologie de Compiègne, Compiègne Cedex, France
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Kammoun M, Piquereau J, Nadal‐Desbarats L, Même S, Beuvin M, Bonne G, Veksler V, Le Fur Y, Pouletaut P, Même W, Szeremeta F, Constans J, Bruinsma ES, Nelson Holte MH, Najafova Z, Johnsen SA, Subramaniam M, Hawse JR, Bensamoun SF. Novel role of Tieg1 in muscle metabolism and mitochondrial oxidative capacities. Acta Physiol (Oxf) 2020; 228:e13394. [PMID: 31560161 DOI: 10.1111/apha.13394] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 09/20/2019] [Accepted: 09/23/2019] [Indexed: 12/26/2022]
Abstract
AIM Tieg1 is involved in multiple signalling pathways, human diseases, and is highly expressed in muscle where its functions are poorly understood. METHODS We have utilized Tieg1 knockout (KO) mice to identify novel and important roles for this transcription factor in regulating muscle ultrastructure, metabolism and mitochondrial functions in the soleus and extensor digitorum longus (EDL) muscles. RNA sequencing, immunoblotting, transmission electron microscopy, MRI, NMR, histochemical and mitochondrial function assays were performed. RESULTS Loss of Tieg1 expression resulted in altered sarcomere organization and a significant decrease in mitochondrial number. Histochemical analyses demonstrated an absence of succinate dehydrogenase staining and a decrease in cytochrome c oxidase (COX) enzyme activity in KO soleus with similar, but diminished, effects in the EDL. Decreased complex I, COX and citrate synthase (CS) activities were detected in the soleus muscle of KO mice indicating altered mitochondrial function. Complex I activity was also diminished in KO EDL. Significant decreases in CS and respiratory chain complex activities were identified in KO soleus. 1 H-NMR spectra revealed no significant metabolic difference between wild-type and KO muscles. However, 31 P spectra revealed a significant decrease in phosphocreatine and ATPγ. Altered expression of 279 genes, many of which play roles in mitochondrial and muscle function, were identified in KO soleus muscle. Ultimately, all of these changes resulted in an exercise intolerance phenotype in Tieg1 KO mice. CONCLUSION Our findings have implicated novel roles for Tieg1 in muscle including regulation of gene expression, metabolic activity and organization of tissue ultrastructure. This muscle phenotype resembles diseases associated with exercise intolerance and myopathies of unknown consequence.
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Affiliation(s)
- Malek Kammoun
- Biomechanics and Bioengineering Laboratory Alliance Sorbonne Universités Université de Technologie de Compiègne UMR CNRS 7338 Compiègne France
| | - Jerome Piquereau
- Signalling and Cardiovascular Pathophysiology ‐ UMR‐S 1180 Université Paris‐Sud INSERM Université Paris‐Saclay Châtenay‐Malabry France
| | | | - Sandra Même
- CNRS UPR4301 Centre de Biophysique Moléculaire Orléans France
| | - Maud Beuvin
- Inserm U974 Centre de Recherche en Myologie Sorbonne Université Paris France
| | - Gisèle Bonne
- Inserm U974 Centre de Recherche en Myologie Sorbonne Université Paris France
| | - Vladimir Veksler
- Signalling and Cardiovascular Pathophysiology ‐ UMR‐S 1180 Université Paris‐Sud INSERM Université Paris‐Saclay Châtenay‐Malabry France
| | - Yann Le Fur
- Aix‐Marseille University CNRS CRMBM Marseille France
| | - Philippe Pouletaut
- Biomechanics and Bioengineering Laboratory Alliance Sorbonne Universités Université de Technologie de Compiègne UMR CNRS 7338 Compiègne France
| | - William Même
- CNRS UPR4301 Centre de Biophysique Moléculaire Orléans France
| | | | - Jean‐Marc Constans
- Institut Faire Faces EA Chimère Imagerie et Radiologie Médicale CHU Amiens Amiens France
| | | | | | - Zeynab Najafova
- Department of General, Visceral and Pediatric Surgery University Medical Center Göttingen Göttingen Germany
| | - Steven A. Johnsen
- Department of General, Visceral and Pediatric Surgery University Medical Center Göttingen Göttingen Germany
| | | | - John R. Hawse
- Department of Biochemistry and Molecular Biology Mayo Clinic Rochester MN USA
| | - Sabine F. Bensamoun
- Biomechanics and Bioengineering Laboratory Alliance Sorbonne Universités Université de Technologie de Compiègne UMR CNRS 7338 Compiègne France
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Ternifi R, Kammoun M, Pouletaut P, Subramaniam M, Hawse JR, Bensamoun SF. Ultrasound image processing to estimate the structural and functional properties of mouse skeletal muscle. Biomed Signal Process Control 2020; 56. [DOI: 10.1016/j.bspc.2019.101735] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Kammoun M, Pouletaut P, Nguyen TN, Subramaniam M, Hawse JR, Bensamoun SF. The Effect of Freezing Time on Muscle Fiber Mechanical Properties. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2020; 2019:5356-5359. [PMID: 31947066 DOI: 10.1109/embc.2019.8857804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The purpose of this study was to investigate the effect of freezing time on the functional behavior of mouse muscle fibers. Passive mechanical tests were performed on single soleus muscle fibers from fresh (0 month) and preserved (stored at -20°C for 3, 6, 9 and 12 months) 3 month old mice. The Young's modulus and the dynamic and the static stresses were measured. A viscoelastic Hill model of 3rd order was used to fit the experimental relaxation test data. The statistical analysis corresponding to the elastic modulus of single muscle fibers did not differ when comparing fresh and stored samples for 3 and 6 months at -20 °C. From 9 months, fibers were less resistant and the mechanical properties were damaged. The primary goal of this study was to complete the gold standard process of muscle fiber preservation for subsequent mechanical property studies. We have demonstrated that muscle fibers can be stored at -20°C for up to 6 months without altering their mechanical properties.
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Development of a novel multiphysical approach for the characterization of mechanical properties of musculotendinous tissues. Sci Rep 2019; 9:7733. [PMID: 31118478 PMCID: PMC6531478 DOI: 10.1038/s41598-019-44053-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Accepted: 05/03/2019] [Indexed: 12/02/2022] Open
Abstract
At present, there is a lack of well-validated protocols that allow for the analysis of the mechanical properties of muscle and tendon tissues. Further, there are no reports regarding characterization of mouse skeletal muscle and tendon mechanical properties in vivo using elastography thereby limiting the ability to monitor changes in these tissues during disease progression or response to therapy. Therefore, we sought to develop novel protocols for the characterization of mechanical properties in musculotendinous tissues using atomic force microscopy (AFM) and ultrasound elastography. Given that TIEG1 knockout (KO) mice exhibit well characterized defects in the mechanical properties of skeletal muscle and tendon tissue, we have chosen to use this model system in the present study. Using TIEG1 knockout and wild-type mice, we have devised an AFM protocol that does not rely on the use of glue or chemical agents for muscle and tendon fiber immobilization during acquisition of transversal cartographies of elasticity and topography. Additionally, since AFM cannot be employed on live animals, we have also developed an ultrasound elastography protocol using a new linear transducer, SLH20-6 (resolution: 38 µm, footprint: 2.38 cm), to characterize the musculotendinous system in vivo. This protocol allows for the identification of changes in muscle and tendon elasticities. Such innovative technological approaches have no equivalent to date, promise to accelerate our understanding of musculotendinous mechanical properties and have numerous research and clinical applications.
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Kammoun M, Dupres V, Landoulsi J, Subramaniam M, Hawse J, Bensamoun SF. Transversal elasticity of TIEG1 KO muscle and tendon fibers probed by atomic force microscopy. Comput Methods Biomech Biomed Engin 2019. [DOI: 10.1080/10255842.2020.1714923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- M. Kammoun
- Sorbonne University, Université de technologie de Compiègne, CNRS UMR 7338, Compiègne, France
| | - V. Dupres
- Institut Pasteur de Lille, Center of Infection and Immunity of Lille, CNRS UMR 8204, Lille, France
| | - J. Landoulsi
- Pierre and Marie Curie University, Laboratoire de Réactivité de Surface UMR 7197, Paris, France
| | - M. Subramaniam
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, NY, USA
| | - J. Hawse
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, NY, USA
| | - S. F. Bensamoun
- Sorbonne University, Université de technologie de Compiègne, CNRS UMR 7338, Compiègne, France
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Cai J, Xing F, Batra A, Liu F, Walter GA, Vandenborne K, Yang L. Texture Analysis for Muscular Dystrophy Classification in MRI with Improved Class Activation Mapping. PATTERN RECOGNITION 2019; 86:368-375. [PMID: 31105339 PMCID: PMC6521874 DOI: 10.1016/j.patcog.2018.08.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The muscular dystrophies are made up of a diverse group of rare genetic diseases characterized by progressive loss of muscle strength and muscle damage. Since there is no cure for muscular dystrophy and clinical outcome measures are limited, it is critical to assess the progression of MD objectively. Imaging muscle replacement by fibrofatty tissue has been shown to be a robust biomarker to monitor disease progression in DMD. In magnetic resonance imaging (MRI) data, specific texture patterns are found to correlate to certain MD subtypes and thus present a potential way for automatic assessment. In this paper, we first apply state-of-the-art convolutional neural networks (CNNs) to perform accurate MD image classification and then propose an effective visualization method to highlight the important image textures. With a dystrophic MRI dataset, we found that the best CNN model delivers an 91.7% classification accuracy, which significantly outperforms non-deep learning methods, e.g., >40% improvement has been found over the traditional mean fat fraction (MFF) criterion for DMD and CMD classification. After investigating every single neuron at the top layer of CNN model, we found the superior classification ability of CNN can be explained by its 91 and 118 neurons were performing better than the MFF criterion under the measurements of Euclidean and Chi-square distance, respectively. In order to further interpret CNNs predictions, we tested an improved class activation mapping (ICAM) method to visualize the important regions in the MRI images. With this ICAM, CNNs are able to locate the most discriminative texture patterns of DMD in soleus, lateral gastrocnemius, and medial gastrocnemius; for CMD, the critical texture patterns are highlighted in soleus, tibialis posterior, and peroneus.
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Affiliation(s)
- Jinzheng Cai
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida
| | - Fuyong Xing
- Department of Biostatistics and Informatics, University of Colorado Denver
| | - Abhinandan Batra
- Department of Physiology and Functional Genomics, University of Florida
| | - Fujun Liu
- Department of Electrical and Computer Engineering, University of Florida
| | - Glenn A. Walter
- Department of Physiology and Functional Genomics, University of Florida
| | | | - Lin Yang
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida
- Department of Electrical and Computer Engineering, University of Florida
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Memon A, Lee WK. KLF10 as a Tumor Suppressor Gene and Its TGF-β Signaling. Cancers (Basel) 2018; 10:E161. [PMID: 29799499 PMCID: PMC6025274 DOI: 10.3390/cancers10060161] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Revised: 05/15/2018] [Accepted: 05/23/2018] [Indexed: 12/17/2022] Open
Abstract
Krüppel-like factor 10 (KLF10), originally named TGF-β (Transforming growth factor beta) inducible early gene 1 (TIEG1), is a DNA-binding transcriptional regulator containing a triple C2H2 zinc finger domain. By binding to Sp1 (specificity protein 1) sites on the DNA and interactions with other regulatory transcription factors, KLF10 encourages and suppresses the expression of multiple genes in many cell types. Many studies have investigated its signaling cascade, but other than the TGF-β/Smad signaling pathway, these are still not clear. KLF10 plays a role in proliferation, differentiation as well as apoptosis, just like other members of the SP (specificity proteins)/KLF (Krüppel-like Factors). Recently, several studies reported that KLF10 KO (Knock out) is associated with defects in cell and organs such as osteopenia, abnormal tendon or cardiac hypertrophy. Since KLF10 was first discovered, several studies have defined its role in cancer as a tumor suppressor. KLF10 demonstrate anti-proliferative effects and induce apoptosis in various carcinoma cells including pancreatic cancer, leukemia, and osteoporosis. Collectively, these data indicate that KLF10 plays a significant role in various biological processes and diseases, but its role in cancer is still unclear. Therefore, this review was conducted to describe and discuss the role and function of KLF10 in diseases, including cancer, with a special emphasis on its signaling with TGF-β.
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Affiliation(s)
- Azra Memon
- Laboratory of Developmental Genetics, Department of Biomedical Sciences, School of Medicine, Inha University, Incheon 22212, Korea.
| | - Woon Kyu Lee
- Laboratory of Developmental Genetics, Department of Biomedical Sciences, School of Medicine, Inha University, Incheon 22212, Korea.
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DiMario JX. KLF10 Gene Expression Modulates Fibrosis in Dystrophic Skeletal Muscle. THE AMERICAN JOURNAL OF PATHOLOGY 2018; 188:1263-1275. [PMID: 29458012 DOI: 10.1016/j.ajpath.2018.01.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 01/22/2018] [Accepted: 01/30/2018] [Indexed: 02/06/2023]
Abstract
Dystrophic skeletal muscle is characterized by fibrotic accumulation of extracellular matrix components that compromise muscle structure, function, and capacity for regeneration. Tissue fibrosis is often initiated and sustained through transforming growth factor-β (TGF-β) signaling, and Krüppel-like factor 10 (KLF10) is an immediate early gene that is transcriptionally activated in response to TGF-β signaling. It encodes a transcriptional regulator that mediates the effects of TGF-β signaling in a variety of cell types. This report presents results of investigation of the effects of loss of KLF10 gene expression in wild-type and dystrophic (mdx) skeletal muscle. On the basis of RT-PCR, Western blot, and histological analyses of mouse tibialis anterior and diaphragm muscles, collagen type I (Col1a1) and fibronectin gene expression and protein deposition were increased in KLF10-/- mice, contributing to increased fibrosis. KLF10-/- mice displayed increased expression of genes encoding SMAD2, SMAD3, and SMAD7, particularly in diaphragm muscle. SMAD4 gene expression was unchanged. Expression of the extracellular matrix remodeling genes, MMP2 and TIMP1, was also increased in KLF10-deficient mouse muscle. Histological analyses and assays of hydroxyproline content indicated that the loss of KLF10 increased fibrosis. Dystrophic KLF10-null mice also had reduced grip strength. The effects of loss of KLF10 gene expression were most pronounced in dystrophic diaphragm muscle, suggesting that KLF10 moderates the fibrotic effects of TGF-β signaling in chronically damaged regenerating muscle.
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Affiliation(s)
- Joseph X DiMario
- Department of Cell Biology and Anatomy, Rosalind Franklin University of Medicine and Science, Chicago Medical School, North Chicago, Illinois.
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Kammoun M, Pouletaut P, Canon F, Subramaniam M, Hawse JR, Vayssade M, Bensamoun SF. Impact of TIEG1 Deletion on the Passive Mechanical Properties of Fast and Slow Twitch Skeletal Muscles in Female Mice. PLoS One 2016; 11:e0164566. [PMID: 27736981 PMCID: PMC5063386 DOI: 10.1371/journal.pone.0164566] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 09/27/2016] [Indexed: 11/24/2022] Open
Abstract
As transforming growth factor (TGF)-β inducible early gene-1 is highly expressed in skeletal muscle, the effect of TIEG1 gene deletion on the passive mechanical properties of slow and fast twitch muscle fibers was analyzed. Twenty five muscle fibers were harvested from soleus (Sol) and extensor digitorum longus (EDL) muscles from TIEG1-/- (N = 5) and control (N = 5) mice. Mechanical tests were performed on fibers and the dynamic and static stresses were measured. A viscoelastic Hill model of 3rd order was used to fit the experimental relaxation test data. In parallel, immunohistochemical analyses were performed on three serial transverse sections to detect the myosin isoforms within the slow and fast muscles. The percentage and the mean cross sectional area of each fiber type were calculated. These tests revealed a significant increase in the mechanical stress properties for the TIEG1-/- Sol fibers while a significant decrease appeared for the TIEG1-/- EDL fibers. Hill model tracked the shape of the experimental relaxation curve for both genotypes and both fiber types. Immunohistochemical results showed hypertrophy of all fiber types for TIEG1-/- muscles with an increase in the percentage of glycolytic fibers (IIX, and IIB) and a decrease of oxidative fibers (I, and IIA). This study has provided new insights into the role of TIEG1, known as KLF10, in the functional (SoltypeI: more resistant, EDLtypeIIB: less resistant) and morphological (glycolytic hypertrophy) properties of fast and slow twitch skeletal muscles. Further investigation at the cellular level will better reveal the role of the TIEG1 gene in skeletal muscle tissue.
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Affiliation(s)
- Malek Kammoun
- Biomechanics and Bioengineering Laboratory, UMR CNRS 7338, Sorbonne University, Université de Technologie de Compiègne, Compiègne, France
| | - Philippe Pouletaut
- Biomechanics and Bioengineering Laboratory, UMR CNRS 7338, Sorbonne University, Université de Technologie de Compiègne, Compiègne, France
| | - Francis Canon
- Biomechanics and Bioengineering Laboratory, UMR CNRS 7338, Sorbonne University, Université de Technologie de Compiègne, Compiègne, France
| | - Malayannan Subramaniam
- Department of Biochemistry and Molecular Biology, Mayo Clinic, 200 First Street SW, Rochester, Minnesota, 55905, United States of America
| | - John R. Hawse
- Department of Biochemistry and Molecular Biology, Mayo Clinic, 200 First Street SW, Rochester, Minnesota, 55905, United States of America
| | - Muriel Vayssade
- Biomechanics and Bioengineering Laboratory, UMR CNRS 7338, Sorbonne University, Université de Technologie de Compiègne, Compiègne, France
| | - Sabine F. Bensamoun
- Biomechanics and Bioengineering Laboratory, UMR CNRS 7338, Sorbonne University, Université de Technologie de Compiègne, Compiègne, France
- * E-mail:
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