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Abebe BK, Wang J, Guo J, Wang H, Li A, Zan L. A review of emerging technologies, nutritional practices, and management strategies to improve intramuscular fat composition in beef cattle. Anim Biotechnol 2024; 35:2388704. [PMID: 39133095 DOI: 10.1080/10495398.2024.2388704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Accepted: 07/31/2024] [Indexed: 08/13/2024]
Abstract
The flavour, tenderness and juiciness of the beef are all impacted by the composition of the intramuscular fat (IMF), which is a key determinant of beef quality. Thus, enhancing the IMF composition of beef cattle has become a major area of research. Consequently, the aim of this paper was to provide insight and synthesis into the emerging technologies, nutritional practices and management strategies to improve IMF composition in beef cattle. This review paper examined the current knowledge of management techniques and nutritional approaches relevant to cattle farming in the beef industry. It includes a thorough investigation of animal handling, weaning age, castration, breed selection, sex determination, environmental factors, grazing methods, slaughter weight and age. Additionally, it rigorously explored dietary energy levels and optimization of fatty acid profiles, as well as the use of feed additives and hormone implant techniques with their associated regulations. The paper also delved into emerging technologies that are shaping future beef production, such as genomic selection methods, genome editing techniques, epigenomic analyses, microbiome manipulation strategies, transcriptomic profiling approaches and metabolomics analyses. In conclusion, a holistic approach combining genomic, nutritional and management strategies is imperative for achieving targeted IMF content and ensuring high-quality beef production.
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Affiliation(s)
- Belete Kuraz Abebe
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
- Department of Animal Science, Werabe University, Werabe, Ethiopia
| | - Jianfang Wang
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
| | - Juntao Guo
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
| | - Hongbao Wang
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
| | - Anning Li
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
| | - Linsen Zan
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
- National Beef Cattle Improvement Center, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
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Morel J, Pignard AS, Castells J, Allibert V, Hatimi L, Buhot B, Velarde M, Durieux AC, Freyssenet D. Myostatin gene invalidation does not prevent skeletal muscle mass loss during experimental sepsis in mice. J Physiol 2024; 602:2839-2854. [PMID: 38748517 DOI: 10.1113/jp284973] [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: 06/27/2023] [Accepted: 04/26/2024] [Indexed: 06/15/2024] Open
Abstract
Loss of muscle mass and function induced by sepsis contributes to physical inactivity and disability in intensive care unit patients. Limiting skeletal muscle deconditioning may thus be helpful in reducing the long-term effect of muscle wasting in patients. We tested the hypothesis that invalidation of the myostatin gene, which encodes a powerful negative regulator of skeletal muscle mass, could prevent or attenuate skeletal muscle wasting and improve survival of septic mice. Sepsis was induced by caecal ligature and puncture (CLP) in 13-week-old C57BL/6J wild-type and myostatin knock-out male mice. Survival rates were similar in wild-type and myostatin knock-out mice seven days after CLP. Loss in muscle mass was also similar in wild-type and myostatin knock-out mice 4 and 7 days after CLP. The loss in muscle mass was molecularly supported by an increase in the transcript level of E3-ubiquitin ligases and autophagy-lysosome markers. This transcriptional response was blunted in myostatin knock-out mice. No change was observed in the protein level of markers of the anabolic insulin/IGF1-Akt-mTOR pathway. Muscle strength was similarly decreased in wild-type and myostatin knock-out mice 4 and 7 days after CLP. This was associated with a modified expression of genes involved in ion homeostasis and excitation-contraction coupling, suggesting that a long-term functional recovery following experimental sepsis may be impaired by a dysregulated expression of molecular determinants of ion homeostasis and excitation-contraction coupling. In conclusion, myostatin gene invalidation does not provide any benefit in preventing skeletal muscle mass loss and strength in response to experimental sepsis. KEY POINTS: Survival rates are similar in wild-type and myostatin knock-out mice seven days after the induction of sepsis. Loss in muscle mass and muscle strength are similar in wild-type and myostatin knock-out mice 4 and 7 days after the induction of an experimental sepsis. Despite evidence of a transcriptional regulation, the protein level of markers of the anabolic insulin/IGF1-Akt-mTOR pathway remained unchanged. RT-qPCR analysis of autophagy-lysosome pathway markers indicates that activity of the pathway may be altered by experimental sepsis in wild-type and myostatin knock-out mice. Experimental sepsis induces greater variations in the mRNA levels of wild-type mice than those of myostatin knock-out mice, without providing any significant catabolic resistance or functional benefits.
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Affiliation(s)
- Jérome Morel
- Laboratoire Interuniversitaire de Biologie de la Motricité, Université Jean Monnet Saint Etienne, Lyon 1, Université Savoie Mont-Blanc, Saint Etienne, France
- Département d'anesthésie et réanimation, Centre Hospitalier Universitaire de Saint Etienne, Saint Etienne, France
| | - Anne Sophie Pignard
- Laboratoire Interuniversitaire de Biologie de la Motricité, Université Jean Monnet Saint Etienne, Lyon 1, Université Savoie Mont-Blanc, Saint Etienne, France
- Département d'anesthésie et réanimation, Centre Hospitalier Universitaire de Saint Etienne, Saint Etienne, France
| | - Josiane Castells
- Laboratoire Interuniversitaire de Biologie de la Motricité, Université Jean Monnet Saint Etienne, Lyon 1, Université Savoie Mont-Blanc, Saint Etienne, France
| | - Valentine Allibert
- Laboratoire Interuniversitaire de Biologie de la Motricité, Université Jean Monnet Saint Etienne, Lyon 1, Université Savoie Mont-Blanc, Saint Etienne, France
| | - Lahcène Hatimi
- Laboratoire Interuniversitaire de Biologie de la Motricité, Université Jean Monnet Saint Etienne, Lyon 1, Université Savoie Mont-Blanc, Saint Etienne, France
| | - Benjamin Buhot
- Laboratoire Interuniversitaire de Biologie de la Motricité, Université Jean Monnet Saint Etienne, Lyon 1, Université Savoie Mont-Blanc, Saint Etienne, France
| | - Mathias Velarde
- Laboratoire Interuniversitaire de Biologie de la Motricité, Université Jean Monnet Saint Etienne, Lyon 1, Université Savoie Mont-Blanc, Saint Etienne, France
| | - Anne Cécile Durieux
- Laboratoire Interuniversitaire de Biologie de la Motricité, Université Jean Monnet Saint Etienne, Lyon 1, Université Savoie Mont-Blanc, Saint Etienne, France
| | - Damien Freyssenet
- Laboratoire Interuniversitaire de Biologie de la Motricité, Université Jean Monnet Saint Etienne, Lyon 1, Université Savoie Mont-Blanc, Saint Etienne, France
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Bez Batti Angulski A, Hosny N, Cohen H, Martin AA, Hahn D, Bauer J, Metzger JM. Duchenne muscular dystrophy: disease mechanism and therapeutic strategies. Front Physiol 2023; 14:1183101. [PMID: 37435300 PMCID: PMC10330733 DOI: 10.3389/fphys.2023.1183101] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 05/24/2023] [Indexed: 07/13/2023] Open
Abstract
Duchenne muscular dystrophy (DMD) is a severe, progressive, and ultimately fatal disease of skeletal muscle wasting, respiratory insufficiency, and cardiomyopathy. The identification of the dystrophin gene as central to DMD pathogenesis has led to the understanding of the muscle membrane and the proteins involved in membrane stability as the focal point of the disease. The lessons learned from decades of research in human genetics, biochemistry, and physiology have culminated in establishing the myriad functionalities of dystrophin in striated muscle biology. Here, we review the pathophysiological basis of DMD and discuss recent progress toward the development of therapeutic strategies for DMD that are currently close to or are in human clinical trials. The first section of the review focuses on DMD and the mechanisms contributing to membrane instability, inflammation, and fibrosis. The second section discusses therapeutic strategies currently used to treat DMD. This includes a focus on outlining the strengths and limitations of approaches directed at correcting the genetic defect through dystrophin gene replacement, modification, repair, and/or a range of dystrophin-independent approaches. The final section highlights the different therapeutic strategies for DMD currently in clinical trials.
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Affiliation(s)
| | | | | | | | | | | | - Joseph M. Metzger
- Department of Integrative Biology and Physiology, University of Minnesota Medical School, Minneapolis, MN, United States
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Nassar R, Vernus B, Carnac G, Fouret G, Goustard B, Casas F, Tintignac L, Cassar-Malek I, Picard B, Seiliez I, Brioche T, Koechlin-Ramonatxo C, Bertrand-Gaday C, Hamade A, Najjar F, Chabi B, Bonnieu A. Myostatin gene inactivation increases post-mortem calpain-dependent muscle proteolysis in mice. Meat Sci 2021; 185:108726. [PMID: 34973590 DOI: 10.1016/j.meatsci.2021.108726] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 12/17/2021] [Accepted: 12/19/2021] [Indexed: 12/13/2022]
Abstract
Myostatin deficiency leads to extensive skeletal muscle hypertrophy, but its consequence on post-mortem muscle proteolysis is unknown. Here, we compared muscle myofibrillar protein degradation, and autophagy, ubiquitin-proteasome and Ca2+-dependent proteolysis relative to the energetic and redox status in wild-type (WT) and myostatin knock-out mice (KO) during early post-mortem storage. KO muscles showed higher degradation of myofibrillar proteins in the first 24 h after death, associated with preserved antioxidant status, compared with WT muscles. Analysis of key autophagy and ubiquitin-proteasome system markers indicated that these two pathways were not upregulated in post-mortem muscle (both genotypes), but basal autophagic flux and ATP content were lower in KO muscles. Proteasome and caspase activities were not different between WT and KO mice. Conversely, calpain activity was higher in KO muscles, concomitantly with higher troponin T and desmin degradation. Altogether, these results suggest that calpains but not the autophagy, proteasome and caspase systems, explain the difference in post-mortem muscle protein proteolysis between both genotypes.
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Affiliation(s)
- Rim Nassar
- DMEM, University of Montpellier, INRAE, Montpellier, France; Laboratoire d'Innovation thérapeutique, Lebanese University, Beyrouth, Liban
| | - Barbara Vernus
- DMEM, University of Montpellier, INRAE, Montpellier, France
| | - Gilles Carnac
- PHYMEDEXP, University of Montpellier, CNRS, INSERM, CHRU, Montpellier, France
| | - Gilles Fouret
- DMEM, University of Montpellier, INRAE, Montpellier, France
| | | | - François Casas
- DMEM, University of Montpellier, INRAE, Montpellier, France
| | - Lionel Tintignac
- Département de Biomédecine, Basel University, Basel, Switzerland
| | - Isabelle Cassar-Malek
- University Clermont Auvergne, INRAE, VetAgro Sup, UMR Herbivores, F-63122 Saint-Genès-Champanelle, France
| | - Brigitte Picard
- University Clermont Auvergne, INRAE, VetAgro Sup, UMR Herbivores, F-63122 Saint-Genès-Champanelle, France
| | - Iban Seiliez
- Université de Pau et des Pays de l'Adour, E2S UPPA, INRAE, UMR1419 Nutrition Métabolisme et Aquaculture, F-64310 Saint-Pée-sur-Nivelle, France
| | - Thomas Brioche
- DMEM, University of Montpellier, INRAE, Montpellier, France
| | | | | | - Aline Hamade
- Laboratoire d'Innovation thérapeutique, Lebanese University, Beyrouth, Liban
| | - Fadia Najjar
- Laboratoire d'Innovation thérapeutique, Lebanese University, Beyrouth, Liban
| | - Béatrice Chabi
- DMEM, University of Montpellier, INRAE, Montpellier, France
| | - Anne Bonnieu
- DMEM, University of Montpellier, INRAE, Montpellier, France.
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Efthymiadou A, Vasilakis IA, Giannakopoulos A, Chrysis D. Myostatin serum levels in children with type 1 diabetes mellitus. Hormones (Athens) 2021; 20:777-782. [PMID: 34486100 DOI: 10.1007/s42000-021-00317-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Accepted: 08/27/2021] [Indexed: 02/08/2023]
Abstract
PURPOSE Type 1 diabetes mellitus (T1DM) can cause several complications, among them myopathy, which can appear even in adolescents. This is of importance, since skeletal muscle is the largest of the insulin-sensitive tissues and thus plays a significant role in glucose homeostasis. A prime regulator of skeletal muscle mass is myostatin, a protein which has a negative role in skeletal muscle development but also in glucose homeostasis, causing insulin resistance. Since myopathy is a complication of T1DM and myostatin is a fundamental regulator of skeletal muscle and is also involved in glucose homeostasis, we investigated the serum levels of myostatin in children with T1DM. METHODS We determined myostatin serum levels using ELISA in 87 children with T1DM aged 10.62 ± 3.94 years, and in 75 healthy children aged 10.46 ± 3.32 years old. RESULTS Myοstatin was significantly elevated in T1DM compared to the healthy control children (23.60 ± 7.70 vs 16.74 ± 6.95 ng/ml, p < 0.0001). Myostatin was not correlated with body mass index (BMI) SD or hemoglobin A1c (HbA1c). CONCLUSION Children with T1DM have significantly higher serum levels of myostatin compared to healthy children of the same age and BMI SD. The elevated myostatin in T1DM could reflect impaired muscle function and/or glucose metabolism, or could represent a homeostatic mechanism.
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Affiliation(s)
- Alexandra Efthymiadou
- Department of Pediatrics, Division of Endocrinology, Medical School, University of Patras, Patras, Rion 26504, Greece
| | - Ioannis-Anargyros Vasilakis
- Department of Pediatrics, Medical School, University of Patras, Patras, Rion 26504, Greece
- First Department of Pediatrics, Division of Endocrinology, Diabetes and Metabolism, Medical School, National and Kapodistrian University of Athens, Aghia Sophia" Children's Hospital, Athens, Greece
| | - Aristeidis Giannakopoulos
- Department of Pediatrics, Division of Endocrinology, Medical School, University of Patras, Patras, Rion 26504, Greece
| | - Dionisios Chrysis
- Department of Pediatrics, Division of Endocrinology, Medical School, University of Patras, Patras, Rion 26504, Greece.
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Kis J, Rózsa L, Husvéth F, Zsolnai A, Anton I. Role of genes related to performance and reproduction of Thoroughbreds in training and breeding - A review. Acta Vet Hung 2021; 69:315-323. [PMID: 34739392 DOI: 10.1556/004.2021.00045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 10/01/2021] [Indexed: 11/19/2022]
Abstract
Thoroughbreds have been selected for speed and stamina since the 1700s. This selection resulted in structural and functional system-wide adaptations that enhanced physiological characteristics for outstanding speed of 61-71 kph (38-44 mph) between 1,000 and 3,200 m (5 furlongs - 2 miles). At present, horseracing is still an economically important industrial sector, therefore intensive research is underway to explore genes that allow the utilisation of genetic abilities and are significant in breeding and training. This study aims to provide an overview of genetic research and its applicability related to Thoroughbreds.
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Affiliation(s)
- Judit Kis
- 1Department of Animal Breeding, Institute of Animal Science, Hungarian University of Agriculture and Life Sciences, Kaposvár Campus, Guba Sándor u. 40, H-7400 Kaposvár, Hungary
| | - László Rózsa
- 1Department of Animal Breeding, Institute of Animal Science, Hungarian University of Agriculture and Life Sciences, Kaposvár Campus, Guba Sándor u. 40, H-7400 Kaposvár, Hungary
| | - Ferenc Husvéth
- 2Department of Animal Breeding, Institute of Animal Science, Hungarian University of Agriculture and Life Sciences, Georgikon Campus, Hungary
| | - Attila Zsolnai
- 1Department of Animal Breeding, Institute of Animal Science, Hungarian University of Agriculture and Life Sciences, Kaposvár Campus, Guba Sándor u. 40, H-7400 Kaposvár, Hungary
| | - István Anton
- 1Department of Animal Breeding, Institute of Animal Science, Hungarian University of Agriculture and Life Sciences, Kaposvár Campus, Guba Sándor u. 40, H-7400 Kaposvár, Hungary
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Barbé C, Loumaye A, Lause P, Ritvos O, Thissen JP. p21-Activated Kinase 1 Is Permissive for the Skeletal Muscle Hypertrophy Induced by Myostatin Inhibition. Front Physiol 2021; 12:677746. [PMID: 34220542 PMCID: PMC8247767 DOI: 10.3389/fphys.2021.677746] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 05/26/2021] [Indexed: 12/16/2022] Open
Abstract
Skeletal muscle, the most abundant tissue in the body, plays vital roles in locomotion and metabolism. Understanding the cellular processes that govern regulation of muscle mass and function represents an essential step in the development of therapeutic strategies for muscular disorders. Myostatin, a member of the TGF-β family, has been identified as a negative regulator of muscle development. Indeed, its inhibition induces an extensive skeletal muscle hypertrophy requiring the activation of Smad 1/5/8 and the Insulin/IGF-I signaling pathway, but whether other molecular mechanisms are involved in this process remains to be determined. Using transcriptomic data from various Myostatin inhibition models, we identified Pak1 as a potential mediator of Myostatin action on skeletal muscle mass. Our results show that muscle PAK1 levels are systematically increased in response to Myostatin inhibition, parallel to skeletal muscle mass, regardless of the Myostatin inhibition model. Using Pak1 knockout mice, we investigated the role of Pak1 in the skeletal muscle hypertrophy induced by different approaches of Myostatin inhibition. Our findings show that Pak1 deletion does not impede the skeletal muscle hypertrophy magnitude in response to Myostatin inhibition. Therefore, Pak1 is permissive for the skeletal muscle mass increase caused by Myostatin inhibition.
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Affiliation(s)
- Caroline Barbé
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Clinical and Experimental Research, Catholic University of Louvain, Brussels, Belgium
| | - Audrey Loumaye
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Clinical and Experimental Research, Catholic University of Louvain, Brussels, Belgium
| | - Pascale Lause
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Clinical and Experimental Research, Catholic University of Louvain, Brussels, Belgium
| | - Olli Ritvos
- Department of Physiology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Jean-Paul Thissen
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Clinical and Experimental Research, Catholic University of Louvain, Brussels, Belgium
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Gualdrón Duarte JL, Gori AS, Hubin X, Lourenco D, Charlier C, Misztal I, Druet T. Performances of Adaptive MultiBLUP, Bayesian regressions, and weighted-GBLUP approaches for genomic predictions in Belgian Blue beef cattle. BMC Genomics 2020; 21:545. [PMID: 32762654 PMCID: PMC7430838 DOI: 10.1186/s12864-020-06921-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 07/17/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Genomic selection has been successfully implemented in many livestock and crop species. The genomic best linear unbiased predictor (GBLUP) approach, assigning equal variance to all SNP effects, is one of the reference methods. When large-effect variants contribute to complex traits, it has been shown that genomic prediction methods that assign a higher variance to subsets of SNP effects can achieve higher prediction accuracy. We herein compared the efficiency of several such approaches, including the Adaptive MultiBLUP (AM-BLUP) that uses local genomic relationship matrices (GRM) to automatically identify and weight genomic regions with large effects, to predict genetic merit in Belgian Blue beef cattle. RESULTS We used a population of approximately 10,000 genotyped cows and their phenotypes for 14 traits, mostly related to muscular development and body dimensions. According to the trait, we found that 4 to 25% of the genetic variance could be associated with 2 to 12 genomic regions harbouring large-effect variants. Noteworthy, three previously identified recessive deleterious variants presented heterozygote advantage and were among the most significant SNPs for several traits. The AM-BLUP resulted in increased reliability of genomic predictions compared to GBLUP (+ 2%), but Bayesian methods proved more efficient (+ 3%). Overall, the reliability gains remained thus limited although higher gains were observed for skin thickness, a trait affected by two genomic regions having particularly large effects. Higher accuracies than those from the original AM-BLUP were achieved when applying the Bayesian Sparse Linear Mixed Model to pre-select groups of SNPs with large effects and subsequently use their estimated variance to build a weighted GRM. Finally, the single-step GBLUP performed best and could be further improved (+ 3% prediction accuracy) by using these weighted GRM. CONCLUSIONS The AM-BLUP is an attractive method to automatically identify and weight genomic regions with large effects on complex traits. However, the method was less accurate than Bayesian methods. Overall, weighted methods achieved modest accuracy gains compared to GBLUP. Nevertheless, the computational efficiency of the AM-BLUP might be valuable at higher marker density, including with whole-genome sequencing data. Furthermore, weighted GRM are particularly useful to account for large variance loci in the single-step GBLUP.
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Affiliation(s)
- José Luis Gualdrón Duarte
- Unit of Animal Genomics, GIGA-R, 11 Avenue de l'Hôpital (B34), University of Liège, 4000, Liège, Belgium.
| | - Ann-Stephan Gori
- Innovation Department, Elevéo asbl and Inovéo, Awé Group, 5590, Ciney, Belgium
| | - Xavier Hubin
- Innovation Department, Elevéo asbl and Inovéo, Awé Group, 5590, Ciney, Belgium
| | - Daniela Lourenco
- Department of Animal and Dairy Science, University of Georgia, 425 River Rd, Athens, GA, 30602, USA
| | - Carole Charlier
- Unit of Animal Genomics, GIGA-R, 11 Avenue de l'Hôpital (B34), University of Liège, 4000, Liège, Belgium
| | - Ignacy Misztal
- Department of Animal and Dairy Science, University of Georgia, 425 River Rd, Athens, GA, 30602, USA
| | - Tom Druet
- Unit of Animal Genomics, GIGA-R, 11 Avenue de l'Hôpital (B34), University of Liège, 4000, Liège, Belgium
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Parenté A, Boukredine A, Baraige F, Duprat N, Gondran-Tellier V, Magnol L, Blanquet V. GASP-2 overexpressing mice exhibit a hypermuscular phenotype with contrasting molecular effects compared to GASP-1 transgenics. FASEB J 2020; 34:4026-4040. [PMID: 31960486 DOI: 10.1096/fj.201901220r] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 10/27/2019] [Accepted: 12/31/2019] [Indexed: 01/19/2023]
Abstract
Muscle atrophy is associated with many diseases including genetic disorders, sarcopenia, or cachexia syndromes. Myostatin (Mstn), a transforming growth factor-beta (TGF-β) member, plays a key role in skeletal muscle homeostasis as a powerful negative regulator. Over the last decade, about 15 clinical trials aimed at inhibiting the Mstn pathway, failed to produce conclusive results. In this context, we investigated whether growth and differentiation factor-associated serum protein-1 (GASP-1) or GASP-2, two natural inhibitors of Mstn, might represent a potential therapeutic. As we previously reported, mice overexpressing Gasp-1 (Tg(Gasp-1)) present an increase of muscle mass but develop metabolic disorders with aging. Here, we showed that overexpression of Gasp-2 increases the muscular mass without metabolic defects. We also found that Tg(Gasp-2) mice displayed, like Mstn-/- mice, a switch from slow- to fast-twitch myofibers whereas Tg(Gasp-1) mice exhibit a reverse switch. Our studies supported the fact that GASP-2 has less affinity than GASP-1 for Mstn, leading to a constitutive Mstn upregulation only in Tg(Gasp-1) mice, responsible for the observed phenotypic differences. Altogether, our findings highlighted a gene expression regulatory network of TGF-β members and their inhibitors in muscle.
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Affiliation(s)
- Alexis Parenté
- INRA, PEIRENE EA7500, USC1061 GAMAA, Université de Limoges, Limoges, France
| | - Axel Boukredine
- INRA, PEIRENE EA7500, USC1061 GAMAA, Université de Limoges, Limoges, France
| | - Fabienne Baraige
- INRA, PEIRENE EA7500, USC1061 GAMAA, Université de Limoges, Limoges, France
| | - Nathalie Duprat
- INRA, PEIRENE EA7500, USC1061 GAMAA, Université de Limoges, Limoges, France
| | | | - Laetitia Magnol
- INRA, PEIRENE EA7500, USC1061 GAMAA, Université de Limoges, Limoges, France
| | - Véronique Blanquet
- INRA, PEIRENE EA7500, USC1061 GAMAA, Université de Limoges, Limoges, France
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Bi Y, Feng B, Wang Z, Zhu H, Qu L, Lan X, Pan C, Song X. Myostatin (MSTN) Gene Indel Variation and Its Associations with Body Traits in Shaanbei White Cashmere Goat. Animals (Basel) 2020; 10:E168. [PMID: 31963797 PMCID: PMC7022945 DOI: 10.3390/ani10010168] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 01/12/2020] [Accepted: 01/13/2020] [Indexed: 12/21/2022] Open
Abstract
Myostatin (MSTN) gene, also known as growth differentiation factor 8 (GDF8), is a member of the transforming growth factor-beta super-family and plays a negative role in muscle development. It acts as key points during pre- and post-natal life of amniotes that ultimately determine the overall muscle mass of animals. There are several studies that concentrate on the effect of a 5 bp insertion/deletion (indel) within the 5' untranslated region (5' UTR) of goat MSTN gene in goats. However, almost all sample sizes were below 150 individuals. Only in Boer goats, the sample sizes reached 482. Hence, whether the 5 bp indel was still associated with the growth traits of goats in large sample sizes which were more reliable is not clear. To find an effective and dependable DNA marker for goat rearing, we first enlarged the sample sizes (n = 1074, Shaanbei White Cashmere goat) which would enhance the robustness of the analysis and did the association analyses between the 5 bp indel and growth traits. Results uncovered that the 5 bp indel was significantly related to body height, height at hip cross, and chest width index (p < 0.05). In addition, individuals with DD genotype had a superior growing performance than those with the ID genotype. These findings suggested that the 5 bp indel in MSTN gene are significantly associated with growth traits and the specific genotype might be promising for maker-assisted selection (MAS) of goats.
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Affiliation(s)
- Yi Bi
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling 712100, China; (Y.B.); (B.F.); (Z.W.); (X.L.)
| | - Bo Feng
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling 712100, China; (Y.B.); (B.F.); (Z.W.); (X.L.)
| | - Zhen Wang
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling 712100, China; (Y.B.); (B.F.); (Z.W.); (X.L.)
- Shaanxi Provincial Engineering and Technology Research Center of Cashmere Goats, Yulin University, Yulin 719000, China; (H.Z.); (L.Q.)
- Life Science Research Center, Yulin University, Yulin 719000, China
| | - Haijing Zhu
- Shaanxi Provincial Engineering and Technology Research Center of Cashmere Goats, Yulin University, Yulin 719000, China; (H.Z.); (L.Q.)
- Life Science Research Center, Yulin University, Yulin 719000, China
| | - Lei Qu
- Shaanxi Provincial Engineering and Technology Research Center of Cashmere Goats, Yulin University, Yulin 719000, China; (H.Z.); (L.Q.)
- Life Science Research Center, Yulin University, Yulin 719000, China
| | - Xianyong Lan
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling 712100, China; (Y.B.); (B.F.); (Z.W.); (X.L.)
| | - Chuanying Pan
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling 712100, China; (Y.B.); (B.F.); (Z.W.); (X.L.)
| | - Xiaoyue Song
- Shaanxi Provincial Engineering and Technology Research Center of Cashmere Goats, Yulin University, Yulin 719000, China; (H.Z.); (L.Q.)
- Life Science Research Center, Yulin University, Yulin 719000, China
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Chimeric Myostatin — Tetanic Toxin Epitopes and Heterologous Prime-boost Immunization Improve Immune Response Stimulating Muscle Growth in Mice. BIOTECHNOL BIOPROC E 2019. [DOI: 10.1007/s12257-019-0092-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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12
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A Chalcone from Ashitaba ( Angelica keiskei) Stimulates Myoblast Differentiation and Inhibits Dexamethasone-Induced Muscle Atrophy. Nutrients 2019; 11:nu11102419. [PMID: 31658768 PMCID: PMC6835314 DOI: 10.3390/nu11102419] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Revised: 09/30/2019] [Accepted: 10/05/2019] [Indexed: 02/07/2023] Open
Abstract
Ashitaba, Angelica keiskei Koidzumi (AK), as a traditional medicine in Korea, Japan, and China, has been known as an elixir of life having therapeutic potential. However, there is no scientific evidence to support that Ashitaba can enhance or maintain muscle strength. To find a new therapeutic agent from the medicinal plant, we evaluated the anti-myopathy effect of chalcones from ethanol extract of AK (EAK) in cellular and animal models of muscle atrophy. To examine anti-myopathy activity, EAK was treated into dexamethasone injected rats and muscle thickness and histopathological images were analyzed. Oral administration of EAK (250 or 500 mg/kg) alleviated muscle atrophic damages and down-regulated the mRNA levels of muscle-specific ubiquitin-E3 ligases. Among ten compounds isolated from EAK, 4-hydroxyderricin was the most effective principle in stimulating myogenesis of C2C12 myoblasts via activation of p38 mitogen-activated protein kinase (MAPK). In three cellular muscle atrophy models with C2C12 myoblasts damaged by dexamethasone or cancer cell-conditioned medium, 4-hydroxyderricin protected the myosin heavy chain (MHC) degradation through suppressing expressions of MAFbx, MuRF-1 and myostatin. These results suggest that the ethanol extract and its active principle, 4-hydroxyderricin from AK, can overcome the muscle atrophy through double mechanisms of decreasing muscle protein degradation and activating myoblast differentiation.
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Nakamura S, Sato Y, Kobayashi T, Oike T, Kaneko Y, Miyamoto K, Funayama A, Oya A, Nishiwaki T, Matsumoto M, Nakamura M, Kanaji A, Miyamoto T. Insulin-like growth factor-I is required to maintain muscle volume in adult mice. J Bone Miner Metab 2019; 37:627-635. [PMID: 30324536 DOI: 10.1007/s00774-018-0964-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 09/25/2018] [Indexed: 12/20/2022]
Abstract
Insulin-like growth factor-I (IGF-I) is a peptide with diverse functions, among them regulation of embryonic development and bone homeostasis. Serum IGF-I levels decline in the elderly; however, IGF-I function in adults has not been clearly defined. Here, we show that IGF-I is required to maintain muscle mass in adults. We crossed Igf-I flox'd and Mx1 Cre mice to yield Mx1 Cre/Igf-Iflox/flox (IGF-I cKO) mice, and deleted Igf-I in adult mice by polyIpolyC injection. We demonstrate that, although serum IGF-I levels significantly decreased after polyIpolyC injection relative to (Igf-Iflox/flox) controls, serum glucose levels were unchanged. However, muscle mass decreased significantly after IGF-I down-regulation, while bone mass remained the same. In IGF-I cKO muscle, expression of anabolic factors such as Eif4e and p70S6K significantly decreased, while expression of catabolic factors MuRF1 and Atrogin-1 was normal and down-regulated, respectively, suggesting that observed muscle mass reduction was due to perturbed muscle metabolism. Our data demonstrate a specific role for IGF-I in maintaining muscle homeostasis in adults.
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Affiliation(s)
- Satoshi Nakamura
- Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo, 160-8582, Japan
| | - Yuiko Sato
- Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo, 160-8582, Japan
- Department of Advanced Therapy for Musculoskeletal Disorders, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo, 160-8582, Japan
| | - Tami Kobayashi
- Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo, 160-8582, Japan
- Department of Musculoskeletal Reconstruction and Regeneration Surgery, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo, 160-8582, Japan
| | - Takatsugu Oike
- Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo, 160-8582, Japan
| | - Yosuke Kaneko
- Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo, 160-8582, Japan
| | - Kana Miyamoto
- Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo, 160-8582, Japan
| | - Atsushi Funayama
- Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo, 160-8582, Japan
| | - Akihito Oya
- Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo, 160-8582, Japan
| | - Toru Nishiwaki
- Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo, 160-8582, Japan
| | - Morio Matsumoto
- Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo, 160-8582, Japan
| | - Masaya Nakamura
- Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo, 160-8582, Japan
| | - Arihiko Kanaji
- Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo, 160-8582, Japan.
| | - Takeshi Miyamoto
- Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo, 160-8582, Japan.
- Department of Musculoskeletal Reconstruction and Regeneration Surgery, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo, 160-8582, Japan.
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15
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Gueugneau M, d'Hose D, Barbé C, de Barsy M, Lause P, Maiter D, Bindels LB, Delzenne NM, Schaeffer L, Gangloff YG, Chambon C, Coudy-Gandilhon C, Béchet D, Thissen JP. Increased Serpina3n release into circulation during glucocorticoid-mediated muscle atrophy. J Cachexia Sarcopenia Muscle 2018; 9:929-946. [PMID: 29989354 PMCID: PMC6204594 DOI: 10.1002/jcsm.12315] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 04/13/2018] [Accepted: 04/22/2018] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Glucocorticoids (GC) play a major role in muscle atrophy. As skeletal muscle is a secretory organ, characterization of the muscle secretome elicited by muscle atrophy should allow to better understand the cellular mechanisms and to identify circulating biomarkers of this condition. Our project aimed to identify the changes in the muscle secretome associated with GC-induced muscle atrophy and susceptible to translate into circulation. METHODS We have identified the GC-induced changes in the secretome of C2 C12 muscle cells by proteomic analysis, and then, we have determined how these changes translate into the circulation of mice or human subjects exposed to high concentrations of GC. RESULTS This approach led us to identify Serpina3n as one of the most markedly secreted protein in response to GC. Our original in vitro results were confirmed in vivo by an increased expression of Serpina3n in skeletal muscle (3.9-fold; P < 0.01) and in the serum (two-fold; P < 0.01) of mice treated with GC. We also observed increased levels of the human orthologue Serpina3 in the serum of Cushing's syndrome patients compared with healthy controls matched for age and sex (n = 9/group, 2.5-fold; P < 0.01). An increase of Serpina3n was also demonstrated in muscle atrophy models mediated by GC such as cancer cachexia (four-fold; P < 0.01), sepsis (12.5-fold; P < 0.001), or diabetes (two-fold; P < 0.01). In contrast, levels of Serpina3n both in skeletal muscle and in the circulation were reduced in several models of muscle hypertrophy induced by myostatin inhibition (P < 0.01). Furthermore, a cluster of data suggests that the regulation of muscle Serpina3n involves mTOR, an essential determinant of the muscle cell size. CONCLUSIONS Taken together, these data suggest that Serpina3n may represent a circulating biomarker of muscle atrophy associated to GC and, broadly, a reflection of dynamic changes in muscle mass.
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Affiliation(s)
- Marine Gueugneau
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Experimental and Clinical Research, Université catholique de Louvain, Brussels, Belgium.,INRA, UMR1019, Université Clermont Auvergne, UNH, Unité de Nutrition Humaine, CRNH Auvergne, Clermont-Ferrand, France
| | - Donatienne d'Hose
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Experimental and Clinical Research, Université catholique de Louvain, Brussels, Belgium
| | - Caroline Barbé
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Experimental and Clinical Research, Université catholique de Louvain, Brussels, Belgium
| | - Marie de Barsy
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Experimental and Clinical Research, Université catholique de Louvain, Brussels, Belgium
| | - Pascale Lause
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Experimental and Clinical Research, Université catholique de Louvain, Brussels, Belgium
| | - Dominique Maiter
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Experimental and Clinical Research, Université catholique de Louvain, Brussels, Belgium
| | - Laure B Bindels
- Metabolism and Nutrition Research Group, Louvain Drug Research Institute (LDRI), Université catholique de Louvain, Brussels, Belgium
| | - Nathalie M Delzenne
- Metabolism and Nutrition Research Group, Louvain Drug Research Institute (LDRI), Université catholique de Louvain, Brussels, Belgium
| | - Laurent Schaeffer
- INMG, CNRS, UMR 5310, INSERM U1217, LBMC, Ecole Normale Supérieure de Lyon, Lyon, France
| | - Yann-Gaël Gangloff
- INMG, CNRS, UMR 5310, INSERM U1217, LBMC, Ecole Normale Supérieure de Lyon, Lyon, France
| | - Christophe Chambon
- INRA, Plateforme d'Exploration du Métabolisme Composante Protéomique, Saint Genès Champanelle, France
| | - Cécile Coudy-Gandilhon
- INRA, UMR1019, Université Clermont Auvergne, UNH, Unité de Nutrition Humaine, CRNH Auvergne, Clermont-Ferrand, France
| | - Daniel Béchet
- INRA, UMR1019, Université Clermont Auvergne, UNH, Unité de Nutrition Humaine, CRNH Auvergne, Clermont-Ferrand, France
| | - Jean-Paul Thissen
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Experimental and Clinical Research, Université catholique de Louvain, Brussels, Belgium
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Past, Present, and Future Perspective of Targeting Myostatin and Related Signaling Pathways to Counteract Muscle Atrophy. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1088:153-206. [DOI: 10.1007/978-981-13-1435-3_8] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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17
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Desgeorges MM, Devillard X, Toutain J, Castells J, Divoux D, Arnould DF, Haqq C, Bernaudin M, Durieux AC, Touzani O, Freyssenet DG. Pharmacological inhibition of myostatin improves skeletal muscle mass and function in a mouse model of stroke. Sci Rep 2017; 7:14000. [PMID: 29070788 PMCID: PMC5656661 DOI: 10.1038/s41598-017-13912-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Accepted: 09/29/2017] [Indexed: 01/25/2023] Open
Abstract
In stroke patients, loss of skeletal muscle mass leads to prolonged weakness and less efficient rehabilitation. We previously showed that expression of myostatin, a master negative regulator of skeletal muscle mass, was strongly increased in skeletal muscle in a mouse model of stroke. We therefore tested the hypothesis that myostatin inhibition would improve recovery of skeletal muscle mass and function after cerebral ischemia. Cerebral ischemia (45 minutes) was induced by intraluminal right middle cerebral artery occlusion (MCAO). Swiss male mice were randomly assigned to Sham-operated mice (n = 10), MCAO mice receiving the vehicle (n = 15) and MCAO mice receiving an anti-myostatin PINTA745 (n = 12; subcutaneous injection of 7.5 mg.kg-1 PINTA745 immediately after surgery, 3, 7 and 10 days after MCAO). PINTA745 reduced body weight loss and improved body weight recovery after cerebral ischemia, as well as muscle strength and motor function. PINTA745 also increased muscle weight recovery 15 days after cerebral ischemia. Mechanistically, the better recovery of skeletal muscle mass in PINTA745-MCAO mice involved an increased expression of genes encoding myofibrillar proteins. Therefore, an anti-myostatin strategy can improve skeletal muscle recovery after cerebral ischemia and may thus represent an interesting strategy to combat skeletal muscle loss and weakness in stroke patients.
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Affiliation(s)
- Marine Maud Desgeorges
- Université de Lyon, Laboratoire Interuniversitaire de Biologie de la Motricité, Saint Etienne, F-42023, Lyon, France
| | - Xavier Devillard
- Université de Lyon, Laboratoire Interuniversitaire de Biologie de la Motricité, Saint Etienne, F-42023, Lyon, France
| | - Jérome Toutain
- Normandie Univ, Unicaen, Cea, Cnrs, Istct/Cervoxy Group, Caen, F-14000, France
| | - Josiane Castells
- Université de Lyon, Laboratoire Interuniversitaire de Biologie de la Motricité, Saint Etienne, F-42023, Lyon, France
| | - Didier Divoux
- Normandie Univ, Unicaen, Cea, Cnrs, Istct/Cervoxy Group, Caen, F-14000, France
| | - David Frédéric Arnould
- Université de Lyon, Laboratoire Interuniversitaire de Biologie de la Motricité, Saint Etienne, F-42023, Lyon, France
| | - Christopher Haqq
- Atara Biotherapeutics, Inc., South San, Francisco, CA, 94080, USA
| | - Myriam Bernaudin
- Normandie Univ, Unicaen, Cea, Cnrs, Istct/Cervoxy Group, Caen, F-14000, France
| | - Anne-Cécile Durieux
- Université de Lyon, Laboratoire Interuniversitaire de Biologie de la Motricité, Saint Etienne, F-42023, Lyon, France
| | - Omar Touzani
- Normandie Univ, Unicaen, Cea, Cnrs, Istct/Cervoxy Group, Caen, F-14000, France
| | - Damien Gilles Freyssenet
- Université de Lyon, Laboratoire Interuniversitaire de Biologie de la Motricité, Saint Etienne, F-42023, Lyon, France.
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18
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Baati N, Feillet-Coudray C, Fouret G, Vernus B, Goustard B, Coudray C, Lecomte J, Blanquet V, Magnol L, Bonnieu A, Koechlin-Ramonatxo C. Myostatin deficiency is associated with lipidomic abnormalities in skeletal muscles. Biochim Biophys Acta Mol Cell Biol Lipids 2017; 1862:1044-1055. [DOI: 10.1016/j.bbalip.2017.06.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 06/19/2017] [Accepted: 06/29/2017] [Indexed: 11/16/2022]
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19
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Barbé C, Bray F, Gueugneau M, Devassine S, Lause P, Tokarski C, Rolando C, Thissen JP. Comparative Proteomic and Transcriptomic Analysis of Follistatin-Induced Skeletal Muscle Hypertrophy. J Proteome Res 2017; 16:3477-3490. [PMID: 28810121 DOI: 10.1021/acs.jproteome.7b00069] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Skeletal muscle, the most abundant body tissue, plays vital roles in locomotion and metabolism. Myostatin is a negative regulator of skeletal muscle mass. In addition to increasing muscle mass, Myostatin inhibition impacts muscle contractility and energy metabolism. To decipher the mechanisms of action of the Myostatin inhibitors, we used proteomic and transcriptomic approaches to investigate the changes induced in skeletal muscles of transgenic mice overexpressing Follistatin, a physiological Myostatin inhibitor. Our proteomic workflow included a fractionation step to identify weakly expressed proteins and a comparison of fast versus slow muscles. Functional annotation of altered proteins supports the phenotypic changes induced by Myostatin inhibition, including modifications in energy metabolism, fiber type, insulin and calcium signaling, as well as membrane repair and regeneration. Less than 10% of the differentially expressed proteins were found to be also regulated at the mRNA level but the Biological Process annotation, and the KEGG pathways analysis of transcriptomic results shows a great concordance with the proteomic data. Thus this study describes the most extensive omics analysis of muscle overexpressing Follistatin, providing molecular-level insights to explain the observed muscle phenotypic changes.
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Affiliation(s)
- Caroline Barbé
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Experimental and Clinical Research, Université Catholique de Louvain , 1200 Brussels, Belgium
| | - Fabrice Bray
- Miniaturisation pour la Synthèse, l'Analyse & la Protéomique (MSAP), CNRS, USR 3290, Université de Lille; Biochimie Structurale & Fonctionnelle des Assemblages Biomoléculaires, CNRS, FR 3688, FRABIO, Université de Lille and Institut Eugène-Michel Chevreul, CNRS, FR 2638, Université de Lille, 59000 Lille, France
| | - Marine Gueugneau
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Experimental and Clinical Research, Université Catholique de Louvain , 1200 Brussels, Belgium
| | - Stéphanie Devassine
- Miniaturisation pour la Synthèse, l'Analyse & la Protéomique (MSAP), CNRS, USR 3290, Université de Lille; Biochimie Structurale & Fonctionnelle des Assemblages Biomoléculaires, CNRS, FR 3688, FRABIO, Université de Lille and Institut Eugène-Michel Chevreul, CNRS, FR 2638, Université de Lille, 59000 Lille, France
| | - Pascale Lause
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Experimental and Clinical Research, Université Catholique de Louvain , 1200 Brussels, Belgium
| | - Caroline Tokarski
- Miniaturisation pour la Synthèse, l'Analyse & la Protéomique (MSAP), CNRS, USR 3290, Université de Lille; Biochimie Structurale & Fonctionnelle des Assemblages Biomoléculaires, CNRS, FR 3688, FRABIO, Université de Lille and Institut Eugène-Michel Chevreul, CNRS, FR 2638, Université de Lille, 59000 Lille, France
| | - Christian Rolando
- Miniaturisation pour la Synthèse, l'Analyse & la Protéomique (MSAP), CNRS, USR 3290, Université de Lille; Biochimie Structurale & Fonctionnelle des Assemblages Biomoléculaires, CNRS, FR 3688, FRABIO, Université de Lille and Institut Eugène-Michel Chevreul, CNRS, FR 2638, Université de Lille, 59000 Lille, France
| | - Jean-Paul Thissen
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Experimental and Clinical Research, Université Catholique de Louvain , 1200 Brussels, Belgium
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Rader EP, Naimo MA, Ensey J, Baker BA. Agonist muscle adaptation accompanied by antagonist muscle atrophy in the hindlimb of mice following stretch-shortening contraction training. BMC Musculoskelet Disord 2017; 18:60. [PMID: 28148306 PMCID: PMC5288976 DOI: 10.1186/s12891-017-1397-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Accepted: 01/11/2017] [Indexed: 02/26/2023] Open
Abstract
Background The vast majority of dynamometer-based animal models for investigation of the response to chronic muscle contraction exposure has been limited to analysis of isometric, lengthening, or shortening contractions in isolation. An exception to this has been the utilization of a rat model to study stretch-shortening contractions (SSCs), a sequence of consecutive isometric, lengthening, and shortening contractions common during daily activity and resistance-type exercise. However, the availability of diverse genetic strains of rats is limited. Therefore, the purpose of the present study was to develop a dynamometer-based SSC training protocol to induce increased muscle mass and performance in plantarflexor muscles of mice. Methods Young (3 months old) C57BL/6 mice were subjected to 1 month of plantarflexion SSC training. Hindlimb muscles were analyzed for muscle mass, quantitative morphology, myogenesis/myopathy relevant gene expression, and fiber type distribution. Results The main aim of the research was achieved when training induced a 2-fold increase in plantarflexion peak torque output and a 19% increase in muscle mass for the agonist plantaris (PLT) muscle. In establishing this model, several outcomes emerged which raised the value of the model past that of being a mere recapitulation of the rat model. An increase in the number of muscle fibers per transverse muscle section accounted for the PLT muscle mass gain while the antagonist tibialis anterior (TA) muscle atrophied by 30% with preferential atrophy of type IIb and IIx fibers. These alterations were accompanied by distinct gene expression profiles. Conclusions The findings confirm the development of a stretch-shortening contraction training model for the PLT muscle of mice and demonstrate that increased cross-sectional fiber number can occur following high-intensity SSC training. Furthermore, the TA muscle atrophy provides direct evidence for the concept of muscle imbalance in phasic non-weight bearing muscles, a concept largely characterized based on clinical observation of patients. The susceptibility to this imbalance is demonstrated to be selective for the type IIb and IIx muscle fiber types. Overall, the study highlights the importance of considering muscle fiber number modulation and the effect of training on surrounding muscles in exercise comprised of SSCs. Electronic supplementary material The online version of this article (doi:10.1186/s12891-017-1397-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Erik P Rader
- Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, MS L3014, 1095 Willowdale Rd, Morgantown, West Virginia, 26505, USA.
| | - Marshall A Naimo
- Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, MS L3014, 1095 Willowdale Rd, Morgantown, West Virginia, 26505, USA.,West Virginia University School of Medicine, Division of Exercise Physiology, Morgantown, West Virginia, USA
| | - James Ensey
- Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, MS L3014, 1095 Willowdale Rd, Morgantown, West Virginia, 26505, USA
| | - Brent A Baker
- Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, MS L3014, 1095 Willowdale Rd, Morgantown, West Virginia, 26505, USA
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Stantzou A, Ueberschlag-Pitiot V, Thomasson R, Furling D, Bonnieu A, Amthor H, Ferry A. Effect of constitutive inactivation of the myostatin gene on the gain in muscle strength during postnatal growth in two murine models. Muscle Nerve 2016; 55:254-261. [PMID: 27312354 DOI: 10.1002/mus.25220] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Revised: 04/20/2016] [Accepted: 06/13/2016] [Indexed: 11/07/2022]
Abstract
INTRODUCTION The effect of constitutive inactivation of the gene encoding myostatin on the gain in muscle performance during postnatal growth has not been well characterized. METHODS We analyzed 2 murine myostatin knockout (KO) models, (i) the Lee model (KOLee ) and (ii) the Grobet model (KOGrobet ), and measured the contraction of tibialis anterior muscle in situ. RESULTS Absolute maximal isometric force was increased in 6-month-old KOLee and KOGrobet mice, as compared to wild-type mice. Similarly, absolute maximal power was increased in 6-month-old KOLee mice. In contrast, specific maximal force (relative maximal force per unit of muscle mass was decreased in all 6-month-old male and female KO mice, except in 6-month-old female KOGrobet mice, whereas specific maximal power was reduced only in male KOLee mice. CONCLUSIONS Genetic inactivation of myostatin increases maximal force and power, but in return it reduces muscle quality, particularly in male mice. Muscle Nerve 55: 254-261, 2017.
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Affiliation(s)
- Amalia Stantzou
- Université de Versailles Saint-Quentin, Unité de formation et de recherche des sciences de la santé des sciences, Montigny-le-Bretonneux, France
| | - Vanessa Ueberschlag-Pitiot
- Université de Strasbourg, Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France
| | - Remi Thomasson
- Université Paris Descartes, Institut de Recherche bio-Médicale et d'Epidémiologie du Sport, Sorbonne Paris Cité, Paris, France
| | - Denis Furling
- Sorbonne Universités CNRS, Centre de Recherche en Myologie, Paris, France
| | - Anne Bonnieu
- INRA, Université Montpellier, Dynamique Musculaire et Métabolisme, Montpellier, France
| | - Helge Amthor
- Université de Versailles Saint-Quentin, Unité de formation et de recherche des sciences de la santé des sciences, Montigny-le-Bretonneux, France
| | - Arnaud Ferry
- Sorbonne Universités CNRS, Centre de Recherche en Myologie, Paris, France
- Université Paris Descartes, Sorbonne Paris Cité, Paris, France
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Yu B, Lu R, Yuan Y, Zhang T, Song S, Qi Z, Shao B, Zhu M, Mi F, Cheng Y. Efficient TALEN-mediated myostatin gene editing in goats. BMC DEVELOPMENTAL BIOLOGY 2016; 16:26. [PMID: 27461387 PMCID: PMC4962387 DOI: 10.1186/s12861-016-0126-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 07/15/2016] [Indexed: 12/27/2022]
Abstract
Background Myostatin (MSTN) encodes a negative regulator of skeletal muscle mass that might have applications for promoting muscle growth in livestock. In this study, we aimed to test whether targeted MSTN editing, mediated by transcription activator-like effector nucleases (TALENs), is a viable approach to create myostatin-modified goats (Capra hircus). Results We obtained a pair of TALENs (MTAL-2) that could recognize and cut the targeted MSTN site in the goat genome. Fibroblasts from pedigreed goats were co-transfected with MTAL-2, and 272 monoclonal cell strains were confirmed to have mono- or bi-allelic mutations in MSTN. Ten cell strains with different genotypes were used as donor cells for somatic cell nuclear transfer, which produced three cloned kids (K179/MSTN−/−, K52-2/MSTN+/−, and K52-1/MSTN+/+). Conclusions The results suggested that the MTAL-2 could disrupt MSTN efficiently in the goat genome. The mutated somatic cells could be used to produce MSTN-site mutated goats without developmental disruption. Thus, TALENs is an effective method for accurate genome editing to produce site-modified goats. Electronic supplementary material The online version of this article (doi:10.1186/s12861-016-0126-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Baoli Yu
- College of Veterinary Medicine, Yangzhou University, No. 12 Wenhui Road, Yangzhou, 225009, Jiangsu Province, People's Republic of China
| | - Rui Lu
- College of Veterinary Medicine, Yangzhou University, No. 12 Wenhui Road, Yangzhou, 225009, Jiangsu Province, People's Republic of China
| | - Yuguo Yuan
- College of Veterinary Medicine, Yangzhou University, No. 12 Wenhui Road, Yangzhou, 225009, Jiangsu Province, People's Republic of China
| | - Ting Zhang
- College of Veterinary Medicine, Yangzhou University, No. 12 Wenhui Road, Yangzhou, 225009, Jiangsu Province, People's Republic of China
| | - Shaozheng Song
- College of Veterinary Medicine, Yangzhou University, No. 12 Wenhui Road, Yangzhou, 225009, Jiangsu Province, People's Republic of China
| | - Zhengqiang Qi
- College of Veterinary Medicine, Yangzhou University, No. 12 Wenhui Road, Yangzhou, 225009, Jiangsu Province, People's Republic of China
| | - Bin Shao
- College of Veterinary Medicine, Yangzhou University, No. 12 Wenhui Road, Yangzhou, 225009, Jiangsu Province, People's Republic of China
| | - Mengmin Zhu
- College of Veterinary Medicine, Yangzhou University, No. 12 Wenhui Road, Yangzhou, 225009, Jiangsu Province, People's Republic of China
| | - Fei Mi
- College of Veterinary Medicine, Yangzhou University, No. 12 Wenhui Road, Yangzhou, 225009, Jiangsu Province, People's Republic of China
| | - Yong Cheng
- College of Veterinary Medicine, Yangzhou University, No. 12 Wenhui Road, Yangzhou, 225009, Jiangsu Province, People's Republic of China.
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Furihata T, Kinugawa S, Fukushima A, Takada S, Homma T, Masaki Y, Abe T, Yokota T, Oba K, Okita K, Tsutsui H. Serum myostatin levels are independently associated with skeletal muscle wasting in patients with heart failure. Int J Cardiol 2016; 220:483-7. [PMID: 27390974 DOI: 10.1016/j.ijcard.2016.06.231] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2016] [Accepted: 06/26/2016] [Indexed: 12/22/2022]
Abstract
BACKGROUND It has been reported that skeletal muscle mass and strength are decreased in patients with heart failure (HF), and HF is associated with both reduced exercise capacity and adverse clinical outcomes. Myostatin has been known as a negative regulator of muscle growth, follistatin as the myostatin antagonist, maintaining tissue homeostasis. We thus determined serum myostatin levels in HF patients and whether they are associated with skeletal muscle wasting. METHODS AND RESULTS Forty one consecutive HF patients (58±15years old, New York Heart Association class I-III) and 30 age-matched healthy subjects as controls (53±8years old) were studied. Serum myostatin levels were significantly lower in HF patients than controls (18.7±7.4 vs. 23.6±5.2ng/mL, P<0.001). Circumference of the thickest part of the right thigh was significantly small (468±72 vs. 559±37mm, P=0.001) and lower extremity muscular strength was lower in patients with HF (129±55 vs. 219±52N×m, P<0.001). Fourteen HF patients (34%) had muscle wasting. By univariate analysis, higher age, higher serum follistatin, and lower serum myostatin were significantly associated with the presence of muscle wasting. By multivariate analysis, serum myostatin levels were independently associated with muscle wasting (OR=0.77, 95% CI [0.58, 0.93], P=0.02). CONCLUSION Serum myostatin levels were significantly decreased in HF patients and associated with lower extremity muscle wasting, suggesting that myostatin may be an important factor for maintaining skeletal muscle mass and strength in HF.
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Affiliation(s)
- Takaaki Furihata
- Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Shintaro Kinugawa
- Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan.
| | - Arata Fukushima
- Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Shingo Takada
- Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Tsuneaki Homma
- Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Yoshihiro Masaki
- Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Takahiro Abe
- Department of Rehabilitation Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Takashi Yokota
- Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Koji Oba
- Translational Research and Clinical Trial Center, Hokkaido University Hospital, Sapporo, Japan
| | - Koichi Okita
- Graduate School of Program in Lifelong Learning Studies, Hokusho University, Ebetsu, Japan
| | - Hiroyuki Tsutsui
- Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan
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24
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Jan AT, Lee EJ, Ahmad S, Choi I. Meeting the meat: delineating the molecular machinery of muscle development. JOURNAL OF ANIMAL SCIENCE AND TECHNOLOGY 2016; 58:18. [PMID: 27168943 PMCID: PMC4862161 DOI: 10.1186/s40781-016-0100-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Accepted: 04/07/2016] [Indexed: 02/07/2023]
Abstract
Muscle, studied mostly with respect to meat production, represents one of the largest protein reservoirs of the body. As gene expression profiling holds credibility to deal with the increasing demand of food from animal sources, excessive loss due to myopathies and other muscular dystrophies was found detrimental as it aggravates diseases that result in increased morbidity and mortality. Holding key point towards improving the developmental program of muscle in meat producing animals, elucidating the underlying mechanisms of the associated pathways in livestock animals is believed to open up new avenues towards enhancing the lean tissue deposition. To this end, identification of vital candidate genes having no known function in myogenesis, is believed to increase the current understanding of the physiological processes going on in the skeletal muscle tissue. Taking consequences of gene expression changes into account, knowledge of the pathways associated with their activation and as such up-regulation seems critical for the overall muscle homeostasis. Having important implications on livestock production, a thorough understanding of postnatal muscle development seems a timely step to fulfil the growing need of ever increasing populations of the world.
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Affiliation(s)
- Arif Tasleem Jan
- School of Biotechnology, Yeungnam University, Gyeongsan, 712-749 Republic of Korea
| | - Eun Ju Lee
- School of Biotechnology, Yeungnam University, Gyeongsan, 712-749 Republic of Korea
| | - Sarafraz Ahmad
- School of Biotechnology, Yeungnam University, Gyeongsan, 712-749 Republic of Korea
| | - Inho Choi
- School of Biotechnology, Yeungnam University, Gyeongsan, 712-749 Republic of Korea
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25
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Lee EJ, Jan AT, Baig MH, Ashraf JM, Nahm SS, Kim YW, Park SY, Choi I. Fibromodulin: a master regulator of myostatin controlling progression of satellite cells through a myogenic program. FASEB J 2016; 30:2708-19. [PMID: 27069062 DOI: 10.1096/fj.201500133r] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2015] [Accepted: 04/05/2016] [Indexed: 12/19/2022]
Abstract
Differentiation of muscle satellite cells (MSCs) involves interaction of the proteins present in the extracellular matrix (ECM) with MSCs to regulate their activity, and therefore phenotype. Herein, we report fibromodulin (FMOD), a member of the proteoglycan family participating in the assembly of ECM, as a novel regulator of myostatin (MSTN) during myoblast differentiation. In addition to having a pronounced effect on the expression of myogenic marker genes [myogenin (MYOG) and myosin light chain 2 (MYL2)], FMOD was found to maintain the transcriptional activity of MSTN Moreover, coimmunoprecipitation and in silico studies performed to investigate the interaction of FMOD helped confirm that it antagonizes MSTN function by distorting its folding and preventing its binding to activin receptor type IIB. Furthermore, in vivo studies revealed that FMOD plays an active role in healing by increasing satellite cell recruitment to sites of injury. Together, these findings disclose a hitherto unrecognized regulatory role for FMOD in MSCs and highlight new mechanisms whereby FMOD circumvents the inhibitory effects of MSTN and triggers myoblast differentiation. These findings offer a basis for the design of novel MSTN inhibitors that promote muscle regeneration after injury or for the development of pharmaceutical agents for the treatment of different muscle atrophies.-Lee, E. J., Jan, A. T., Baig, M. H., Ashraf, J. M., Nahm, S.-S., Kim, Y.-W., Park, S.-Y., Choi, I. Fibromodulin: a master regulator of myostatin controlling progression of satellite cells through a myogenic program.
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Affiliation(s)
- Eun Ju Lee
- School of Biotechnology, Yeungnam University, Gyeongsan, South Korea
| | - Arif Tasleem Jan
- School of Biotechnology, Yeungnam University, Gyeongsan, South Korea
| | | | | | - Sang-Soep Nahm
- College of Veterinary Medicine, Konkuk University, Seoul, South Korea; and
| | - Yong-Woon Kim
- Department of Physiology, College of Medicine, Yeungnam University, South Korea
| | - So-Young Park
- Department of Physiology, College of Medicine, Yeungnam University, South Korea
| | - Inho Choi
- School of Biotechnology, Yeungnam University, Gyeongsan, South Korea;
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26
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Chabi B, Pauly M, Carillon J, Carnac G, Favier FB, Fouret G, Bonafos B, Vanterpool F, Vernus B, Coudray C, Feillet-Coudray C, Bonnieu A, Lacan D, Koechlin-Ramonatxo C. Protective effect of myostatin gene deletion on aging-related muscle metabolic decline. Exp Gerontol 2016; 78:23-31. [PMID: 26944368 DOI: 10.1016/j.exger.2016.01.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Revised: 01/21/2016] [Accepted: 01/28/2016] [Indexed: 12/13/2022]
Abstract
While myostatin gene deletion is a promising therapy to fight muscle loss during aging, this approach induces also skeletal muscle metabolic changes such as mitochondrial deficits, redox alteration and increased fatigability. In the present study, we evaluated the effects of aging on these features in aged wild-type (WT) and mstn knockout (KO) mice. Moreover, to determine whether an enriched-antioxidant diet may be useful to prevent age-related disorders, we orally administered to the two genotypes a melon concentrate rich in superoxide dismutase for 12 weeks. We reported that mitochondrial functional abnormalities persisted (decreased state 3 and 4 of respiration; p<0.05) in skeletal muscle from aged KO mice; however, differences with WT mice were attenuated at old age in line with reduced difference on running endurance between the two genotypes. Interestingly, we showed an increase in glutathione levels, associated with lower lipid peroxidation levels in KO muscle. Enriched antioxidant diet reduced the aging-related negative effects on maximal aerobic velocity and running limit time (p<0.05) in both groups, with systemic adaptations on body weight. The redox status and the hypertrophic phenotype appeared to be beneficial to KO mice, mitigating the effect of aging on the skeletal muscle metabolic remodeling.
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Affiliation(s)
- B Chabi
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier, F-34060, Montpellier, France
| | - M Pauly
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier, F-34060, Montpellier, France
| | | | - G Carnac
- Inserm U1046, Université ́ Montpellier, 34295 Montpellier, France
| | - F B Favier
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier, F-34060, Montpellier, France
| | - G Fouret
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier, F-34060, Montpellier, France
| | - B Bonafos
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier, F-34060, Montpellier, France
| | - F Vanterpool
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier, F-34060, Montpellier, France
| | - B Vernus
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier, F-34060, Montpellier, France
| | - C Coudray
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier, F-34060, Montpellier, France
| | - C Feillet-Coudray
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier, F-34060, Montpellier, France
| | - A Bonnieu
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier, F-34060, Montpellier, France
| | - D Lacan
- Bionov Sarl, Avignon, France
| | - C Koechlin-Ramonatxo
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier, F-34060, Montpellier, France.
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27
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Bond P. Regulation of mTORC1 by growth factors, energy status, amino acids and mechanical stimuli at a glance. J Int Soc Sports Nutr 2016; 13:8. [PMID: 26937223 PMCID: PMC4774173 DOI: 10.1186/s12970-016-0118-y] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Accepted: 02/18/2016] [Indexed: 12/05/2022] Open
Abstract
The mechanistic/mammalian target of rapamycin complex 1 (mTORC1) plays a pivotal role in the regulation of skeletal muscle protein synthesis. Activation of the complex leads to phosphorylation of two important sets of substrates, namely eIF4E binding proteins and ribosomal S6 kinases. Phosphorylation of these substrates then leads to an increase in protein synthesis, mainly by enhancing translation initiation. mTORC1 activity is regulated by several inputs, such as growth factors, energy status, amino acids and mechanical stimuli. Research in this field is rapidly evolving and unraveling how these inputs regulate the complex. Therefore this review attempts to provide a brief and up-to-date narrative on the regulation of this marvelous protein complex. Additionally, some sports supplements which have been shown to regulate mTORC1 activity are discussed.
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Affiliation(s)
- Peter Bond
- PeterBond.nl, Waterhoenlaan 25, Zeist, Netherlands
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28
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Anti-myostatin antibody increases muscle mass and strength and improves insulin sensitivity in old mice. Proc Natl Acad Sci U S A 2016; 113:2212-7. [PMID: 26858428 DOI: 10.1073/pnas.1525795113] [Citation(s) in RCA: 126] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Sarcopenia, or skeletal muscle atrophy, is a debilitating comorbidity of many physiological and pathophysiological processes, including normal aging. There are no approved therapies for sarcopenia, but the antihypertrophic myokine myostatin is a potential therapeutic target. Here, we show that treatment of young and old mice with an anti-myostatin antibody (ATA 842) for 4 wk increased muscle mass and muscle strength in both groups. Furthermore, ATA 842 treatment also increased insulin-stimulated whole body glucose metabolism in old mice, which could be attributed to increased insulin-stimulated skeletal muscle glucose uptake as measured by a hyperinsulinemic-euglycemic clamp. Taken together, these studies provide support for pharmacological inhibition of myostatin as a potential therapeutic approach for age-related sarcopenia and metabolic disease.
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29
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Moon S, Lee JW, Shin D, Shin KY, Kim J, Choi IY, Kim J, Kim H. A Genome-wide Scan for Selective Sweeps in Racing Horses. ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES 2015; 28:1525-31. [PMID: 26333666 PMCID: PMC4647090 DOI: 10.5713/ajas.14.0696] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Revised: 11/09/2014] [Accepted: 02/22/2015] [Indexed: 11/27/2022]
Abstract
Using next-generation sequencing, we conducted a genome-wide scan of selective sweeps associated with selection toward genetic improvement in Thoroughbreds. We investigated potential phenotypic consequence of putative candidate loci by candidate gene association mapping for the finishing time in 240 Thoroughbred horses. We found a significant association with the trait for Ral GApase alpha 2 (RALGAP2) that regulates a variety of cellular processes of signal trafficking. Neighboring genes around RALGAP2 included insulinoma-associated 1 (INSM1), pallid (PLDN), and Ras and Rab interactor 2 (RIN2) genes have similar roles in signal trafficking, suggesting that a co-evolving gene cluster located on the chromosome 22 is under strong artificial selection in racehorses.
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Affiliation(s)
- Sunjin Moon
- Department of Agricultural Biotechnology and Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul 151-742, Korea
| | - Jin Woo Lee
- Horse Registry, Korea Racing Authority (KRA), Gwacheon 427-711, Korea
| | - Donghyun Shin
- Department of Agricultural Biotechnology and Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul 151-742, Korea
| | | | - Jun Kim
- Institute for Livestock Promotion, Jeju 690-802, Korea
| | - Ik-Young Choi
- Genome analysis center, National Instrumentation and Environmental Management (NICEM), Seoul National University, Seoul 151-921, Korea
| | - Jaemin Kim
- Interdisciplinary Program in Bioinformatics, Seoul National University, Seoul 151-742, Korea
| | - Heebal Kim
- Department of Agricultural Biotechnology and Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul 151-742, Korea ; Interdisciplinary Program in Bioinformatics, Seoul National University, Seoul 151-742, Korea ; C&K Genomics, Seoul 151-742, Korea
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30
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Tang L, Yang X, Gao X, Du H, Han Y, Zhang D, Wang Z, Sun L. Inhibiting myostatin signaling prevents femoral trabecular bone loss and microarchitecture deterioration in diet-induced obese rats. Exp Biol Med (Maywood) 2015; 241:308-16. [PMID: 26438721 DOI: 10.1177/1535370215606814] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 08/21/2015] [Indexed: 01/16/2023] Open
Abstract
Besides resulting in a dramatic increase in skeletal muscle mass, myostatin (MSTN) deficiency has a positive effect on bone formation. However, the issue about whether blocking MSTN can inhibit obesity-induced bone loss has not been previously investigated. In the present study, we have evaluated the effects of MSTN blocking on bone quality in high-fat (HF), diet-induced obese rats using a prepared polyclonal antibody for MSTN (MsAb). Twenty-four rats were randomly assigned to the Control, HF and HF + MsAb groups. Rats in the HF + MsAb group were injected once a week with purified MsAb for eight weeks. The results showed that MsAb significantly reduced body and fat weight, and increased muscle mass and strength in the HF group. MicroCT analysis demonstrated that obesity-induced bone loss and architecture deterioration were significantly mitigated by MsAb treatment, as evidenced by increased bone mineral density, bone volume over total volume, trabecular number and thickness, and decreased trabecular separation and structure model index. However, neither HF diet nor MsAb treatment had an impact on femoral biomechanical properties including maximum load, stiffness, energy absorption and elastic modulus. Moreover, MsAb significantly increased adiponectin concentrations, and decreased TNF-α and IL-6 levels in diet-induced obese rats. Taken together, blocking MSTN by MsAb improves bone quality in diet-induced obese rats through a mechanotransduction pathway from skeletal muscle, and the accompanying changes occurring in the levels of circulating adipokines and pro-inflammatory cytokines may also be involved in this process. It indicates that the administration of MSTN antagonists may be a promising therapy for treating obesity and obesity-induced bone loss.
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Affiliation(s)
- Liang Tang
- Institute of Sports Biology, Shaanxi Normal University, Xi'an 710119, China
| | - Xiaoying Yang
- Institute of Sports Biology, Shaanxi Normal University, Xi'an 710119, China
| | - Xiaohang Gao
- Institute of Sports Biology, Shaanxi Normal University, Xi'an 710119, China
| | - Haiping Du
- Institute of Sports Biology, Shaanxi Normal University, Xi'an 710119, China
| | - Yanqi Han
- Institute of Sports Biology, Shaanxi Normal University, Xi'an 710119, China
| | - Didi Zhang
- Institute of Sports Biology, Shaanxi Normal University, Xi'an 710119, China
| | - Zhiyuan Wang
- Institute of Sports Biology, Shaanxi Normal University, Xi'an 710119, China
| | - Lijun Sun
- Institute of Sports Biology, Shaanxi Normal University, Xi'an 710119, China Postdoctoral Research Station of Biology, Shaanxi Normal University, Xi'an 710119, China
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31
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Barbé C, Kalista S, Loumaye A, Ritvos O, Lause P, Ferracin B, Thissen JP. Role of IGF-I in follistatin-induced skeletal muscle hypertrophy. Am J Physiol Endocrinol Metab 2015. [PMID: 26219865 PMCID: PMC4572457 DOI: 10.1152/ajpendo.00098.2015] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Follistatin, a physiological inhibitor of myostatin, induces a dramatic increase in skeletal muscle mass, requiring the type 1 IGF-I receptor/Akt/mTOR pathway. The aim of the present study was to investigate the role of IGF-I and insulin, two ligands of the IGF-I receptor, in the follistatin hypertrophic action on skeletal muscle. In a first step, we showed that follistatin increases muscle mass while being associated with a downregulation of muscle IGF-I expression. In addition, follistatin retained its full hypertrophic effect toward muscle in hypophysectomized animals despite very low concentrations of circulating and muscle IGF-I. Furthermore, follistatin did not increase muscle sensitivity to IGF-I in stimulating phosphorylation of Akt but, surprisingly, decreased it once hypertrophy was present. Taken together, these observations indicate that increased muscle IGF-I production or sensitivity does not contribute to the muscle hypertrophy caused by follistatin. Unlike low IGF-I, low insulin, as obtained by streptozotocin injection, attenuated the hypertrophic action of follistatin on skeletal muscle. Moreover, the full anabolic response to follistatin was restored in this condition by insulin but also by IGF-I infusion. Therefore, follistatin-induced muscle hypertrophy requires the activation of the insulin/IGF-I pathway by either insulin or IGF-I. When insulin or IGF-I alone is missing, follistatin retains its full anabolic effect, but when both are deficient, as in streptozotocin-treated animals, follistatin fails to stimulate muscle growth.
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Affiliation(s)
- Caroline Barbé
- Pole of Endocrinology, Diabetes and Nutrition; Institut de Recherche Expérimentale et Clinique IREC, Université Catholique de Louvain, Brussels, Belgium; and
| | - Stéphanie Kalista
- Pole of Endocrinology, Diabetes and Nutrition; Institut de Recherche Expérimentale et Clinique IREC, Université Catholique de Louvain, Brussels, Belgium; and
| | - Audrey Loumaye
- Pole of Endocrinology, Diabetes and Nutrition; Institut de Recherche Expérimentale et Clinique IREC, Université Catholique de Louvain, Brussels, Belgium; and
| | - Olli Ritvos
- Department of Bacteriology and Immunology, Haartman Institute, University of Helsinki, Helsinki, Finland
| | - Pascale Lause
- Pole of Endocrinology, Diabetes and Nutrition; Institut de Recherche Expérimentale et Clinique IREC, Université Catholique de Louvain, Brussels, Belgium; and
| | - Benjamin Ferracin
- Pole of Endocrinology, Diabetes and Nutrition; Institut de Recherche Expérimentale et Clinique IREC, Université Catholique de Louvain, Brussels, Belgium; and
| | - Jean-Paul Thissen
- Pole of Endocrinology, Diabetes and Nutrition; Institut de Recherche Expérimentale et Clinique IREC, Université Catholique de Louvain, Brussels, Belgium; and
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32
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Myostatin Activates the Ubiquitin-Proteasome and Autophagy-Lysosome Systems Contributing to Muscle Wasting in Chronic Kidney Disease. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2015:684965. [PMID: 26448817 PMCID: PMC4584061 DOI: 10.1155/2015/684965] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 10/18/2014] [Accepted: 12/11/2014] [Indexed: 12/24/2022]
Abstract
Our evidence demonstrated that CKD upregulated the expression of myostatin, TNF-α, and p-IkBa and downregulated the phosphorylation of PI3K, Akt, and FoxO3a, which were also associated with protein degradation and muscle atrophy. The autophagosome formation and protein expression of autophagy-related genes were increased in muscle of CKD rats. The mRNA level and protein expression of MAFbx and MuRF-1 were also upregulated in CKD rats, as well as proteasome activity of 26S. Moreover, activation of myostatin elicited by TNF-α induces C2C12 myotube atrophy via upregulating the expression of autophagy-related genes, including MAFbx and MuRF1 and proteasome subunits. Inactivation of FoxO3a triggered by PI3K inhibitor LY294002 prevented the myostatin-induced increase of expression of MuRF1, MAFbx, and LC3-II protein in C2C12 myotubes. The findings were further consolidated by using siRNA interference and overexpression of myostatin. Additionally, expression of myostatin was activated by TNF-α via a NF-κB dependent pathway in C2C12 myotubes, while inhibition of NF-κB activity suppressed myostatin and improved myotube atrophy. Collectively, myostatin mediated CKD-induced muscle catabolism via coordinate activation of the autophagy and the ubiquitin-proteasome systems.
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33
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Abubakar M, Saeed A, Kul O. Modification of Animal Products for Fat and Other Characteristics. THE ROLE OF BIOTECHNOLOGY IN IMPROVEMENT OF LIVESTOCK 2015. [PMCID: PMC7121827 DOI: 10.1007/978-3-662-46789-3_4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This chapter includes information about modification of animal products using biotechnology and the importance of different modifications on the natural composition. The species considered for modified products include beef and dairy cattle, sheep, goats, poultry, and a wide variety of fishes. Moreover, the discussion includes the importance of animal food, nongenetically engineered animal modified food products, genetically engineered animal modified food items primarily for meat, milk, or egg and genetically engineered animal food along the transgenic approach for animal welfare. Modern biotechnology can improve productivity, consistency, and quality of alter animal food, fiber, and medical products. The transgenic technology is potentially valuable to alter characters of economic importance in a rapid and precise way. The food safety issue related to genetic engineering is also included in this chapter. The harm of such modified food and transgenic strategy should also be understood by the reader along with its advantages. In this context, transgenic approaches in animal biotechnology are under discussion that ranges from animal food production to their adverse effects.
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Affiliation(s)
| | - Ali Saeed
- Institute of Molecular Biology and Biotechnology, Bahauddin Zakariya University, Multan, Pakistan
| | - Oguz Kul
- Veterinary Faculty, Kirikkale University, Yahsihan, Turkey
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Rodriguez J, Vernus B, Chelh I, Cassar-Malek I, Gabillard JC, Hadj Sassi A, Seiliez I, Picard B, Bonnieu A. Myostatin and the skeletal muscle atrophy and hypertrophy signaling pathways. Cell Mol Life Sci 2014; 71:4361-71. [PMID: 25080109 PMCID: PMC11113773 DOI: 10.1007/s00018-014-1689-x] [Citation(s) in RCA: 259] [Impact Index Per Article: 25.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Revised: 07/16/2014] [Accepted: 07/17/2014] [Indexed: 12/16/2022]
Abstract
Myostatin, a member of the transforming growth factor-β superfamily, is a potent negative regulator of skeletal muscle growth and is conserved in many species, from rodents to humans. Myostatin inactivation can induce skeletal muscle hypertrophy, while its overexpression or systemic administration causes muscle atrophy. As it represents a potential target for stimulating muscle growth and/or preventing muscle wasting, myostatin regulation and functions in the control of muscle mass have been extensively studied. A wealth of data strongly suggests that alterations in skeletal muscle mass are associated with dysregulation in myostatin expression. Moreover, myostatin plays a central role in integrating/mediating anabolic and catabolic responses. Myostatin negatively regulates the activity of the Akt pathway, which promotes protein synthesis, and increases the activity of the ubiquitin-proteasome system to induce atrophy. Several new studies have brought new information on how myostatin may affect both ribosomal biogenesis and translation efficiency of specific mRNA subclasses. In addition, although myostatin has been identified as a modulator of the major catabolic pathways, including the ubiquitin-proteasome and the autophagy-lysosome systems, the underlying mechanisms are only partially understood. The goal of this review is to highlight outstanding questions about myostatin-mediated regulation of the anabolic and catabolic signaling pathways in skeletal muscle. Particular emphasis has been placed on (1) the cross-regulation between myostatin, the growth-promoting pathways and the proteolytic systems; (2) how myostatin inhibition leads to muscle hypertrophy; and (3) the regulation of translation by myostatin.
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Affiliation(s)
- J. Rodriguez
- INRA, UMR866 Dynamique Musculaire Et Métabolisme, Université Montpellier 1, Université Montpellier 2, 2 Place Viala, 34060 Montpellier, France
| | - B. Vernus
- INRA, UMR866 Dynamique Musculaire Et Métabolisme, Université Montpellier 1, Université Montpellier 2, 2 Place Viala, 34060 Montpellier, France
| | - I. Chelh
- INRA, VetAgro Sup, UMR1213 Herbivores, 63122 Saint-Genès-Champanelle, France
| | - I. Cassar-Malek
- INRA, VetAgro Sup, UMR1213 Herbivores, 63122 Saint-Genès-Champanelle, France
| | - J. C. Gabillard
- INRA, UR1037, Fish Physiology and Genomics, Campus de Beaulieu, 35000 Rennes, France
| | - A. Hadj Sassi
- INRA-USC2009, Université Bordeaux 1, Avenue des Facultés, 33405 Talence, France
| | - I. Seiliez
- INRA, UR1067 Nutrition, Métabolisme, Aquaculture, 64310 Saint-Pée-sur-Nivelle, France
| | - B. Picard
- INRA, VetAgro Sup, UMR1213 Herbivores, 63122 Saint-Genès-Champanelle, France
| | - A. Bonnieu
- INRA, UMR866 Dynamique Musculaire Et Métabolisme, Université Montpellier 1, Université Montpellier 2, 2 Place Viala, 34060 Montpellier, France
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Gallot YS, Durieux AC, Castells J, Desgeorges MM, Vernus B, Plantureux L, Rémond D, Jahnke VE, Lefai E, Dardevet D, Nemoz G, Schaeffer L, Bonnieu A, Freyssenet DG. Myostatin gene inactivation prevents skeletal muscle wasting in cancer. Cancer Res 2014; 74:7344-56. [PMID: 25336187 DOI: 10.1158/0008-5472.can-14-0057] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Cachexia is a muscle-wasting syndrome that contributes significantly to morbidity and mortality of many patients with advanced cancers. However, little is understood about how the severe loss of skeletal muscle characterizing this condition occurs. In the current study, we tested the hypothesis that the muscle protein myostatin is involved in mediating the pathogenesis of cachexia-induced muscle wasting in tumor-bearing mice. Myostatin gene inactivation prevented the severe loss of skeletal muscle mass induced in mice engrafted with Lewis lung carcinoma (LLC) cells or in Apc(Min) (/+) mice, an established model of colorectal cancer and cachexia. Mechanistically, myostatin loss attenuated the activation of muscle fiber proteolytic pathways by inhibiting the expression of atrophy-related genes, MuRF1 and MAFbx/Atrogin-1, along with autophagy-related genes. Notably, myostatin loss also impeded the growth of LLC tumors, the number and the size of intestinal polyps in Apc(Min) (/+) mice, thus strongly increasing survival in both models. Gene expression analysis in the LLC model showed this phenotype to be associated with reduced expression of genes involved in tumor metabolism, activin signaling, and apoptosis. Taken together, our results reveal an essential role for myostatin in the pathogenesis of cancer cachexia and link this condition to tumor growth, with implications for furthering understanding of cancer as a systemic disease.
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Affiliation(s)
- Yann S Gallot
- Laboratoire de Physiologie de l'Exercice, Université de Lyon, Saint Etienne, France
| | - Anne-Cécile Durieux
- Laboratoire de Physiologie de l'Exercice, Université de Lyon, Saint Etienne, France
| | - Josiane Castells
- Laboratoire de Physiologie de l'Exercice, Université de Lyon, Saint Etienne, France
| | - Marine M Desgeorges
- Laboratoire de Physiologie de l'Exercice, Université de Lyon, Saint Etienne, France
| | - Barbara Vernus
- INRA UMR 866 Dynamique Musculaire et Métabolisme, Montpellier, France
| | - Léa Plantureux
- Laboratoire de Physiologie de l'Exercice, Université de Lyon, Saint Etienne, France
| | - Didier Rémond
- INRA UMR 1019, Unité de Nutrition Humaine, Clermont-Ferrand, France
| | - Vanessa E Jahnke
- Laboratoire de Physiologie de l'Exercice, Université de Lyon, Saint Etienne, France
| | - Etienne Lefai
- INSERM U1060, INRA USC1235, CarMeN Laboratory, Université de Lyon, Oullins, France
| | | | - Georges Nemoz
- INSERM U1060, INRA USC1235, CarMeN Laboratory, Université de Lyon, Oullins, France
| | - Laurent Schaeffer
- CNRS UMR 5239, Laboratoire de Biologie Moléculaire de la Cellule, Ecole Normale Supérieure de Lyon, Lyon, France
| | - Anne Bonnieu
- INRA UMR 866 Dynamique Musculaire et Métabolisme, Montpellier, France
| | - Damien G Freyssenet
- Laboratoire de Physiologie de l'Exercice, Université de Lyon, Saint Etienne, France.
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Padhi D, Higano CS, Shore ND, Sieber P, Rasmussen E, Smith MR. Pharmacological inhibition of myostatin and changes in lean body mass and lower extremity muscle size in patients receiving androgen deprivation therapy for prostate cancer. J Clin Endocrinol Metab 2014; 99:E1967-75. [PMID: 24971661 DOI: 10.1210/jc.2014-1271] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CONTEXT Myostatin is a negative regulator of muscle growth. Androgen deprivation (ADT) is associated with muscle loss and increased body fat, and currently available therapies have limited efficacy to treat this complication. The antimyostatin peptibody (AMG 745/Mu-S) markedly attenuated muscle loss and decreased fat accumulation in orchiectomized mice. OBJECTIVE The objective of the study was to evaluate the safety, pharmacokinetics, and muscle efficacy of AMG 745 in men undergoing ADT for nonmetastatic prostate cancer. METHODS This was a randomized, blinded, placebo-controlled, multiple-dose, phase 1 study of AMG 745 given for 28 days. The end point of percentage change from baseline in lean body mass (LBM) as assessed by dual x-ray absorptiometry was prespecified. RESULTS Rates of adverse events (AMG 745 vs placebo) were the following: diarrhea (13% vs 9%), fatigue (13% vs 4%), contusion (10% vs 0%), and injection site bruising (6% vs 4%). Exposure increased linearly from 0.3 mg/kg to 3 mg/kg. AMG 745 significantly increased LBM in the 3 mg/kg vs the placebo groups on day 29 by 2.2% (±0.8% SE, P = 0.008); in exploratory fat mass analysis, a decrease of -2.5% (±1.0% SE, P = 0.021) was observed. Pharmacodynamic changes in muscle and fat were maintained at follow-up, 1 month after day 29. CONCLUSION Four weekly s.c. doses of AMG 745 were well tolerated and were associated with increased LBM and decreased fat in the men receiving ADT for nonmetastatic prostate cancer. RESULTS support further investigation of AMG 745 in clinical settings with muscle loss and atrophy.
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Affiliation(s)
- Desmond Padhi
- Department of Medical Sciences (D.P.) and Biostatistics (E.R.), Amgen Inc (D.P.), Thousand Oaks, California 91320; Department of Medicine (C.S.H.), University of Washington, and Fred Hutchinson Cancer Research Center, Seattle, Washington 98109; Carolina Urologic Research Center, (N.D.S.), Myrtle Beach, South Carolina 29579; Urological Associates of Lancaster (P.S.), Lancaster, Pennsylvania 17604; and Massachusetts General Hospital Cancer Center (M.R.S.), Boston, Massachusetts 02114
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Pauly M, Chabi B, Favier FB, Vanterpool F, Matecki S, Fouret G, Bonafos B, Vernus B, Feillet-Coudray C, Coudray C, Bonnieu A, Ramonatxo C. Combined Strategies for Maintaining Skeletal Muscle Mass and Function in Aging: Myostatin Inactivation and AICAR-Associated Oxidative Metabolism Induction. J Gerontol A Biol Sci Med Sci 2014; 70:1077-87. [PMID: 25227129 DOI: 10.1093/gerona/glu147] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2014] [Accepted: 07/21/2014] [Indexed: 11/13/2022] Open
Abstract
Myostatin (mstn) blockade, resulting in muscle hypertrophy, is a promising therapy to counteract age-related muscle loss. However, oxidative and mitochondrial deficit observed in young mice with myostatin inhibition could be detrimental with aging. The aim of this study was (a) to bring original data on metabolic and mitochondrial consequences of mstn inhibition in old mice, and (b) to examine whether 4-weeks of AICAR treatment, a pharmacological compound known to upregulate oxidative metabolism, may be useful to improve exercise capacity and mitochondrial deficit of 20-months mstn KO versus wild-type (WT) mice. Our results show that despite the enlarged muscle mass, the oxidative and mitochondrial deficit associated with reduced endurance running capacity is maintained in old mstn KO mice but not worsened by aging. Importantly, AICAR treatment induced a significant beneficial effect on running limit time only in old mstn KO mice, with a marked increase in PGC-1α expression and slight beneficial effects on mitochondrial function. We showed that AICAR effects were autophagy-independent. This study underlines the relevance of aged muscle remodelling by complementary approaches that impact both muscle mass and function, and suggest that mstn inhibition and aerobic metabolism activators should be co-developed for delaying age-related deficits in skeletal muscle.
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Affiliation(s)
- Marion Pauly
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier 1, F-34060, Montpellier, France INSERM U1046, Physiology and Experimental Medicine Heart-Muscle Unit, Université Montpellier 1, Université Montpellier 2, Montpellier, France
| | - Béatrice Chabi
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier 1, F-34060, Montpellier, France
| | - François Bertrand Favier
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier 1, F-34060, Montpellier, France
| | - Frankie Vanterpool
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier 1, F-34060, Montpellier, France
| | - Stefan Matecki
- INSERM U1046, Physiology and Experimental Medicine Heart-Muscle Unit, Université Montpellier 1, Université Montpellier 2, Montpellier, France
| | - Gilles Fouret
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier 1, F-34060, Montpellier, France
| | - Béatrice Bonafos
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier 1, F-34060, Montpellier, France
| | - Barbara Vernus
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier 1, F-34060, Montpellier, France
| | - Christine Feillet-Coudray
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier 1, F-34060, Montpellier, France
| | - Charles Coudray
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier 1, F-34060, Montpellier, France
| | - Anne Bonnieu
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier 1, F-34060, Montpellier, France
| | - Christelle Ramonatxo
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier 1, F-34060, Montpellier, France
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Numb-deficient satellite cells have regeneration and proliferation defects. Proc Natl Acad Sci U S A 2013; 110:18549-54. [PMID: 24170859 DOI: 10.1073/pnas.1311628110] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The adaptor protein Numb has been implicated in the switch between cell proliferation and differentiation made by satellite cells during muscle repair. Using two genetic approaches to ablate Numb, we determined that, in its absence, muscle regeneration in response to injury was impaired. Single myofiber cultures demonstrated a lack of satellite cell proliferation in the absence of Numb, and the proliferation defect was confirmed in satellite cell cultures. Quantitative RT-PCR from Numb-deficient satellite cells demonstrated highly up-regulated expression of p21 and Myostatin, both inhibitors of myoblast proliferation. Transfection with Myostatin-specific siRNA rescued the proliferation defect of Numb-deficient satellite cells. Furthermore, overexpression of Numb in satellite cells inhibited Myostatin expression. These data indicate a unique function for Numb during the initial activation and proliferation of satellite cells in response to muscle injury.
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Glucocorticoid-induced skeletal muscle atrophy. Int J Biochem Cell Biol 2013; 45:2163-72. [PMID: 23806868 DOI: 10.1016/j.biocel.2013.05.036] [Citation(s) in RCA: 403] [Impact Index Per Article: 36.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2013] [Revised: 05/27/2013] [Accepted: 05/29/2013] [Indexed: 12/11/2022]
Abstract
Many pathological states characterized by muscle atrophy (e.g., sepsis, cachexia, starvation, metabolic acidosis and severe insulinopenia) are associated with an increase in circulating glucocorticoids (GC) levels, suggesting that GC could trigger the muscle atrophy observed in these conditions. GC-induced muscle atrophy is characterized by fast-twitch, glycolytic muscles atrophy illustrated by decreased fiber cross-sectional area and reduced myofibrillar protein content. GC-induced muscle atrophy results from increased protein breakdown and decreased protein synthesis. Increased muscle proteolysis, in particular through the activation of the ubiquitin proteasome and the lysosomal systems, is considered to play a major role in the catabolic action of GC. The stimulation by GC of these two proteolytic systems is mediated through the increased expression of several Atrogenes ("genes involved in atrophy"), such as FOXO, Atrogin-1, and MuRF-1. The inhibitory effect of GC on muscle protein synthesis is thought to result mainly from the inhibition of the mTOR/S6 kinase 1 pathway. These changes in muscle protein turnover could be explained by changes in the muscle production of two growth factors, namely Insulin-like Growth Factor (IGF)-I, a muscle anabolic growth factor and Myostatin, a muscle catabolic growth factor. This review will discuss the recent progress made in the understanding of the mechanisms involved in GC-induced muscle atrophy and consider the implications of these advancements in the development of new therapeutic approaches for treating GC-induced myopathy. This article is part of a Directed Issue entitled: Molecular basis of muscle wasting.
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Bonaldo P, Sandri M. Cellular and molecular mechanisms of muscle atrophy. Dis Model Mech 2013; 6:25-39. [PMID: 23268536 PMCID: PMC3529336 DOI: 10.1242/dmm.010389] [Citation(s) in RCA: 825] [Impact Index Per Article: 75.0] [Reference Citation Analysis] [Abstract] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Skeletal muscle is a plastic organ that is maintained by multiple pathways regulating cell and protein turnover. During muscle atrophy, proteolytic systems are activated, and contractile proteins and organelles are removed, resulting in the shrinkage of muscle fibers. Excessive loss of muscle mass is associated with poor prognosis in several diseases, including myopathies and muscular dystrophies, as well as in systemic disorders such as cancer, diabetes, sepsis and heart failure. Muscle loss also occurs during aging. In this paper, we review the key mechanisms that regulate the turnover of contractile proteins and organelles in muscle tissue, and discuss how impairments in these mechanisms can contribute to muscle atrophy. We also discuss how protein synthesis and degradation are coordinately regulated by signaling pathways that are influenced by mechanical stress, physical activity, and the availability of nutrients and growth factors. Understanding how these pathways regulate muscle mass will provide new therapeutic targets for the prevention and treatment of muscle atrophy in metabolic and neuromuscular diseases.
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Affiliation(s)
- Paolo Bonaldo
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy.
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Tripathi AK, Aparnathi MK, Patel AK, Joshi CG. In vitro silencing of myostatin gene by shRNAs in chicken embryonic myoblast cells. Biotechnol Prog 2013; 29:425-31. [PMID: 23292805 DOI: 10.1002/btpr.1681] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Revised: 10/15/2012] [Indexed: 12/30/2022]
Abstract
RNA interference represents one of the potential mechanisms of regulation of gene expression. Selective downregulation of myostatin (MSTN), a member of transforming growth factor-β (TGF-β) superfamily and a negative regulator of myogenesis, has been demonstrated to enhance skeletal muscle growth. In this study, we studied short hairpin RNA (shRNA)-induced myostatin gene silencing in chicken embryonic myoblast cells using seven different shRNA-expressing constructs by reverse transcription-quantitative real time PCR (RT-qPCR). Myostatin-silencing efficiency of all shRNA constructs were first evaluated in human embryonic kidney cell line 293T (HEK293T) cells, where we observed 30-75.6% reduction in myostatin expression, followed by chicken embryo myoblast cells that revealed up to 55% reduction in myostatin expression along with upregulation of MyoD by 4.65-folds. Consistent with the earlier observations, the transfection of cells with plasmids led to significant increase in interferon responsive genes OAS1 and IFN β (2-112-folds), independent of myostatin silencing in both HEK293T and chicken embryonic myoblast cells. Our study suggests that apart from shRNA sequences, cell type-specific factors may play a significant role in determining the knockdown efficiency of shRNAs.
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Affiliation(s)
- Ajai K Tripathi
- Dept. of Animal Biotechnology, College of Veterinary Science & Animal Husbandry, Anand Agricultural University, Anand, Gujarat, 388001, India
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Gangopadhyay SS. Systemic administration of follistatin288 increases muscle mass and reduces fat accumulation in mice. Sci Rep 2013; 3:2441. [PMID: 23942549 PMCID: PMC3743061 DOI: 10.1038/srep02441] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Accepted: 07/30/2013] [Indexed: 12/17/2022] Open
Abstract
The present study describes the physiological response associated with daily subcutaneous injection of mice with recombinant follistatin288. This systemic administration of follistatin288 increases the follistatin levels in serum, indicating that the protein enters the circulation. The data suggest that a dose-dependent increase in body lean mass also occurs, together with an increase in muscle mass, possibly as a result of an increase in the size of the muscle fibers. After thirteen weeks of treatment, metabolic changes were observed; additionally, the switching of muscle fiber types was also apparent through myosin heavy chain remodeling, implying that changes are occurring at the molecular level. Furthermore, an increase in the muscle mass was associated with a significant decrease in the body fat mass. Overall, this study raises the possibility for the use of follistatin288 as an agent to treat muscle wasting diseases and/or to restrict fat accumulation by systemic administration of the protein.
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Affiliation(s)
- Samudra S. Gangopadhyay
- Section of Endocrinology, Diabetes, and Nutrition Department of Medicine Boston University School of Medicine 670 Albany Street, Boston, MA 02118
- Current address: Department of Urology, Boston Children's Hospital, 300 Longwood Avenue, Boston, MA 02115 and Department of Surgery, Harvard Medical School, Boston MA
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Schirwis E, Agbulut O, Vadrot N, Mouisel E, Hourdé C, Bonnieu A, Butler-Browne G, Amthor H, Ferry A. The beneficial effect of myostatin deficiency on maximal muscle force and power is attenuated with age. Exp Gerontol 2012. [PMID: 23201547 DOI: 10.1016/j.exger.2012.11.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The prolonged effect of myostatin deficiency on muscle performance in knockout mice has as yet been only poorly investigated. We have demonstrated that absolute maximal force is increased in 6-month old female and male knockout mice and 2-year old female knockout mice as compared to age- and sex-matched wildtype mice. Similarly, absolute maximal power is increased by myostatin deficiency in 6-month old female and male knockout mice but not in 2-year old female knockout mice. The increases we observed were greater in 6-month old female than in male knockout mice and can primarily result from muscle hypertrophy. In contrast, fatigue resistance was decreased in 6-month old knockout mice of both sexes as compared to age- and sex-matched wildtype mice. Moreover, in contrast to 2-year old female wildtype mice, aging in 2-year old knockout mice reduced absolute maximal force and power of both sexes as compared to their younger counterparts, although muscle weight did not change. These age-related decreases were lower in 2-year old female than in 2-year old male knockout mice. Together these results suggest that the beneficial effect of myostatin deficiency on absolute maximal force and power is greater in young (versus old) mice and female (versus male) mice. Most of these effects of myostatin deficiency are related neither to changes in the concentration of myofibrillar proteins nor to the slow to fast fiber type transition.
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Affiliation(s)
- E Schirwis
- Université Pierre et Marie Curie-Paris6, Sorbonne Universités, UMR S794, INSERM, U974, CNRS UMR7215, Institut de Myologie, Paris F-75013, France
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Carneiro I, González T, López M, Señarís R, Devesa J, Arce VM. Myostatin expression is regulated by underfeeding and neonatal programming in rats. J Physiol Biochem 2012; 69:15-23. [DOI: 10.1007/s13105-012-0183-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Accepted: 05/24/2012] [Indexed: 11/28/2022]
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Gay S, Jublanc E, Bonnieu A, Bacou F. Myostatin deficiency is associated with an increase in number of total axons and motor axons innervating mouse tibialis anterior muscle. Muscle Nerve 2012; 45:698-704. [PMID: 22499097 DOI: 10.1002/mus.23242] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
INTRODUCTION Myostatin (Mstn) is a secreted protein that acts as a negative regulator of skeletal muscle mass. However, a critical evaluation of neuromuscular aspects of hypertrophied muscles induced by Mstn deficiency has not been done. METHODS We compared the tibialis anterior muscle-nerve interrelationships in wild-type and Mstn-null mice of both genders by immunohistochemical analyses, which allowed us to count the number of total axons and motor axons and estimate the size of motor units and the innervation ratio of the tibialis anterior muscle (TAm). RESULTS There was an increase in the number of total axons and motor axons, and higher values in both the motor unit size and the innervation ratio of Mstn-null TAm compared with those of wild-type TAm. CONCLUSIONS We found that myostatin is involved either directly in the control of neuromuscular interrelationships or indirectly through its effect on muscle size.
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Affiliation(s)
- Stephanie Gay
- INRA, UMR 866 Dynamique Musculaire et Métabolisme, 2 Place Viala, F-34060 Montpellier, France
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Therapy development for spinal muscular atrophy in SMN independent targets. Neural Plast 2012; 2012:456478. [PMID: 22701806 PMCID: PMC3369530 DOI: 10.1155/2012/456478] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Revised: 04/05/2012] [Accepted: 04/06/2012] [Indexed: 12/11/2022] Open
Abstract
Spinal muscular atrophy (SMA) is an autosomal recessive neurodegenerative disorder, leading to progressive muscle weakness, atrophy, and sometimes premature death. SMA is caused by mutation or deletion of the survival motor neuron-1 (SMN1) gene. An effective treatment does not presently exist. Since the severity of the SMA phenotype is inversely correlated with expression levels of SMN, the SMN-encoded protein, SMN is the most important therapeutic target for development of an effective treatment for SMA. In recent years, numerous SMN independent targets and therapeutic strategies have been demonstrated to have potential roles in SMA treatment. For example, some neurotrophic, antiapoptotic, and myotrophic factors are able to promote survival of motor neurons or improve muscle strength shown in SMA mouse models or clinical trials. Plastin-3, cpg15, and a Rho-kinase inhibitor regulate axonal dynamics and might reduce the influences of SMN depletion in disarrangement of neuromuscular junction. Stem cell transplantation in SMA model mice resulted in improvement of motor behaviors and extension of survival, likely from trophic support. Although most therapies are still under investigation, these nonclassical treatments might provide an adjunctive method for future SMA therapy.
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Ploquin C, Chabi B, Fouret G, Vernus B, Feillet-Coudray C, Coudray C, Bonnieu A, Ramonatxo C. Lack of myostatin alters intermyofibrillar mitochondria activity, unbalances redox status, and impairs tolerance to chronic repetitive contractions in muscle. Am J Physiol Endocrinol Metab 2012; 302:E1000-8. [PMID: 22318951 DOI: 10.1152/ajpendo.00652.2011] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Loss of myostatin (mstn) function leads to a decrease in mitochondrial content, a reduced expression of cytochrome c oxidase, and a lower citrate synthase activity in skeletal muscle. These data suggest functional or ultrastructural mitochondrial abnormalities that can impact on muscle endurance characteristics in such phenotype. To address this issue, we investigated subsarcolemmal and intermyofibrillar (IMF) mitochondrial activities, skeletal muscle redox homeostasis, and muscle fiber endurance quality in mstn-deficient mice [mstn knockout (KO)]. We report that lack of mstn induced a decrease in the coupling of IMF mitochondria respiration, with significantly higher basal oxygen consumption. No lysis of mitochondrial cristae or excessive swelling were observed in mstn KO mice compared with wild-type (WT) mice. Concerning redox status, mstn KO gastrocnemius exhibited a significant decrease in lipid peroxidation levels (-56%; P < 0.01 vs. WT) together with a significant upregulation of the antioxidant glutathione system. In contrast, superoxide dismutase and catalase activities were altered in mstn KO, gastrocnemius and soleus with a reduction of up to 80% compared with WT animals. The force production observed after contractile endurance test was significantly lower in extensor digitorum longus and soleus muscles of mstn KO mice compared with the controls (17 ± 3 and 36 ± 5% vs. 28 ± 4 and 56 ± 5%, respectively, P < 0.05). Together, these findings indicate that, besides an increased skeletal muscle mass, genetic mstn inhibition has differential effects on redox homeostasis and mitochondrial function that would have functional consequences on muscle response to endurance exercise.
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Affiliation(s)
- Claire Ploquin
- Institut National de la Recherche Agronomique, Dynamique Musculaire et Métabolisme, Montpellier, France
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48
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Raychaudhuri S. MicroRNAs overexpressed in growth-restricted rat skeletal muscles regulate the glucose transport in cell culture targeting central TGF-β factor SMAD4. PLoS One 2012; 7:e34596. [PMID: 22506032 PMCID: PMC3323545 DOI: 10.1371/journal.pone.0034596] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2011] [Accepted: 03/07/2012] [Indexed: 12/27/2022] Open
Abstract
The micro-array profiling of micro-RNA has been performed in rat skeletal muscle tissues, isolated from male adult offspring of intrauterine plus postnatal growth restricted model (IPGR). Apparently, the GLUT4 mRNA expression in male sk. muscle was found to be unaltered in contrast to females. The over-expression of miR-29a and miR-23a in the experimental group of SMSP (Starved Mother Starved Pups) have been found to regulate the glucose transport activity with respect to their control counterparts CMCP (Control Mother Control Pups) as confirmed in rat L6 myoblast-myocyte cell culture system. The ex-vivo experimentation demonstrates an aberration in insulin signaling pathway in male sk. muscle that leads to the localization of the membrane-bound Glut4 protein. We have identified through a series of experiments one important protein factor SMAD4, a co-SMAD critical to the TGF-beta signaling pathway. This factor is targeted by miR-29a, as identified in an in vitro reporter-assay system in cell-culture experiment. The other micro-RNA, miR-23a, targets SMAD4 indirectly that seems to be critical in regulating insulin-dependent glucose transport activity. MicroRNA mimics, inhibitors and siRNA studies indicate the role of SMAD4 as inhibitory for glucose transport activities in normal physiological condition. The data demonstrate for the first time a critical function of microRNAs in fine-tuning the regulation of glucose transport in skeletal muscle. Chronic starved conditions (IPGR) in sk. muscle up-regulates microRNA changing the target protein expression patterns, such as SMAD4, to alter the glucose transport pathways for the survival. The innovative outcome of this paper identifies a critical pathway (TGF-beta) that may act negatively for the mammalian glucose transport machinery.
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Affiliation(s)
- Santanu Raychaudhuri
- Department of Pediatrics, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, United States of America.
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Rodriguez J, Vernus B, Toubiana M, Jublanc E, Tintignac L, Leibovitch S, Bonnieu A. Myostatin inactivation increases myotube size through regulation of translational initiation machinery. J Cell Biochem 2012; 112:3531-42. [PMID: 21769921 DOI: 10.1002/jcb.23280] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Myostatin deficiency leads in skeletal muscle overgrowth but the precise molecular mechanisms underlying this hypertrophy are not well understood. In this study, to gain insight into the role of endogenous myostatin in the translational regulation, we used an in vitro model of cultured satellite cells derived from myostatin knock-out mice. Our results show that myostatin knock-out myotubes are larger than control myotubes and that this phenotype is associated with an increased activation of the Akt/mTOR signaling pathway, a known regulator of muscle hypertrophy. These results demonstrate that hypertrophy due to myostatin deficiency is preserved in vitro and suggest that myostatin deletion results in an increased protein synthesis. Accordingly, the rates of global RNA content, polysome formation and protein synthesis are all increased in myostatin-deficient myotubes while they are counteracted by the addition of recombinant myostatin. We furthermore demonstrated that genetic deletion of myostatin stimulates cap-dependent translation by positively regulating assembly of the translation preinitiation complex. Together the data indicate that myostatin controls muscle hypertrophy in part by regulating protein synthesis initiation rates, that is, translational efficiency.
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Affiliation(s)
- Julie Rodriguez
- INRA, UMR866 Dynamique Musculaire et Métabolisme, Université Montpellier 1, F 34060 Montpellier, France
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50
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A sensitised mutagenesis screen in the mouse to explore the bovine genome: study of muscle characteristics. Animal 2012; 5:663-71. [PMID: 22439989 DOI: 10.1017/s1751731110002405] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Meat yield and quality are closely related to muscle development. The muscle characteristics mainly take place during embryonic and postnatal phases. Thus, genetic control of muscle development in early stages represents a significant stake to improve product quality and production efficiency. In bovine, several programmes have been developed to detect quantitative trait loci (QTL) affecting growth, carcass composition or meat quality traits. Such strategy is incontestably very powerful yet extremely cumbersome and costly when dealing with large animals such as ruminants. Furthermore, the fine mapping of the QTL remains a real challenge. Here, we proposed an alternative approach based on chemical mutagenesis in the mouse combined with comparative genomics to identify regions or genes controlling muscle development in cattle. At present, we isolated seven independent mouse lines of high interest. Two lines exhibit a hypermuscular phenotype, and the other five show various skeletomuscular phenotypes. Detailed characterisation of these mouse mutants will give crucial input for the identification and the mapping of genes that control muscular development. Our strategy will provide the opportunity to understand the function and control of genes involved in improvement of animal physiology.
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