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Gros A, Furlan FM, Rouglan V, Favereaux A, Bontempi B, Morel JL. Physical exercise restores adult neurogenesis deficits induced by simulated microgravity. NPJ Microgravity 2024; 10:69. [PMID: 38906877 PMCID: PMC11192769 DOI: 10.1038/s41526-024-00411-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Accepted: 06/11/2024] [Indexed: 06/23/2024] Open
Abstract
Cognitive impairments have been reported in astronauts during spaceflights and documented in ground-based models of simulated microgravity (SMG) in animals. However, the neuronal causes of these behavioral effects remain largely unknown. We explored whether adult neurogenesis, known to be a crucial plasticity mechanism supporting memory processes, is altered by SMG. Adult male Long-Evans rats were submitted to the hindlimb unloading model of SMG. We studied the proliferation, survival and maturation of newborn cells in the following neurogenic niches: the subventricular zone (SVZ)/olfactory bulb (OB) and the dentate gyrus (DG) of the hippocampus, at different delays following various periods of SMG. SMG exposure for 7 days, but not shorter periods of 6 or 24 h, resulted in a decrease of newborn cell proliferation restricted to the DG. SMG also induced a decrease in short-term (7 days), but not long-term (21 days), survival of newborn cells in the SVZ/OB and DG. Physical exercise, used as a countermeasure, was able to reverse the decrease in newborn cell survival observed in the SVZ and DG. In addition, depending on the duration of SMG periods, transcriptomic analysis revealed modifications in gene expression involved in neurogenesis. These findings highlight the sensitivity of adult neurogenesis to gravitational environmental factors during a transient period, suggesting that there is a period of adaptation of physiological systems to this new environment.
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Affiliation(s)
- Alexandra Gros
- CNRS, INCIA, UMR 5287, University Bordeaux, F-33000, Bordeaux, France
- CNRS, IMN, UMR 5293, University Bordeaux, F-33000, Bordeaux, France
- Centre National d'Etudes Spatiales, F-75001, Paris, France
| | - Fandilla Marie Furlan
- CNRS, IMN, UMR 5293, University Bordeaux, F-33000, Bordeaux, France
- Department of Genetics & Evolution, 30 Quai Ernest-Ansermet, 1205, Geneva, Switzerland
| | - Vanessa Rouglan
- CNRS, IINS, UMR 5297, University Bordeaux, F-33000, Bordeaux, France
| | | | - Bruno Bontempi
- CNRS, INCIA, UMR 5287, University Bordeaux, F-33000, Bordeaux, France
- CNRS, IMN, UMR 5293, University Bordeaux, F-33000, Bordeaux, France
| | - Jean-Luc Morel
- CNRS, INCIA, UMR 5287, University Bordeaux, F-33000, Bordeaux, France.
- CNRS, IMN, UMR 5293, University Bordeaux, F-33000, Bordeaux, France.
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Kamal KY, Othman MA, Kim JH, Lawler JM. Bioreactor development for skeletal muscle hypertrophy and atrophy by manipulating uniaxial cyclic strain: proof of concept. NPJ Microgravity 2024; 10:62. [PMID: 38862543 PMCID: PMC11167039 DOI: 10.1038/s41526-023-00320-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Accepted: 08/15/2023] [Indexed: 06/13/2024] Open
Abstract
Skeletal muscles overcome terrestrial, gravitational loading by producing tensile forces that produce movement through joint rotation. Conversely, the microgravity of spaceflight reduces tensile loads in working skeletal muscles, causing an adaptive muscle atrophy. Unfortunately, the design of stable, physiological bioreactors to model skeletal muscle tensile loading during spaceflight experiments remains challenging. Here, we tested a bioreactor that uses initiation and cessation of cyclic, tensile strain to induce hypertrophy and atrophy, respectively, in murine lineage (C2C12) skeletal muscle myotubes. Uniaxial cyclic stretch of myotubes was conducted using a StrexCell® (STB-1400) stepper motor system (0.75 Hz, 12% strain, 60 min day^-1). Myotube groups were assigned as follows: (a) quiescent over 2- or (b) 5-day (no stretch), (c) experienced 2-days (2dHY) or (d) 5-days (5dHY) of cyclic stretch, or (e) 2-days of cyclic stretch followed by a 3-day cessation of stretch (3dAT). Using ß-sarcoglycan as a sarcolemmal marker, mean myotube diameter increased significantly following 2dAT (51%) and 5dAT (94%) vs. matched controls. The hypertrophic, anabolic markers talin and Akt phosphorylation (Thr308) were elevated with 2dHY but not in 3dAT myotubes. Inflammatory, catabolic markers IL-1ß, IL6, and NF-kappaB p65 subunit were significantly higher in the 3dAT group vs. all other groups. The ratio of phosphorylated FoxO3a/total FoxO3a was significantly lower in 3dAT than in the 2dHY group, consistent with elevated catabolic signaling during unloading. In summary, we demonstrated proof-of-concept for a spaceflight research bioreactor, using uniaxial cyclic stretch to produce myotube hypertrophy with increased tensile loading, and myotube atrophy with subsequent cessation of stretch.
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Affiliation(s)
- Khaled Y Kamal
- Redox Biology & Cell Signaling Laboratory, Department of Health and Kinesiology, Graduate Faculty of Nutrition, Texas A&M University, College Station, TX, USA.
| | - Mariam Atef Othman
- Redox Biology & Cell Signaling Laboratory, Department of Health and Kinesiology, Graduate Faculty of Nutrition, Texas A&M University, College Station, TX, USA
| | - Joo-Hyun Kim
- Redox Biology & Cell Signaling Laboratory, Department of Health and Kinesiology, Graduate Faculty of Nutrition, Texas A&M University, College Station, TX, USA
| | - John M Lawler
- Redox Biology & Cell Signaling Laboratory, Department of Health and Kinesiology, Graduate Faculty of Nutrition, Texas A&M University, College Station, TX, USA
- Department of Nutrition, Texas A&M University, College Station, TX, USA
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3
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Shahtout JL, Eshima H, Ferrara PJ, Maschek JA, Cox JE, Drummond MJ, Funai K. Inhibition of the skeletal muscle Lands cycle ameliorates weakness induced by physical inactivity. J Cachexia Sarcopenia Muscle 2024; 15:319-330. [PMID: 38123161 PMCID: PMC10834354 DOI: 10.1002/jcsm.13406] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 10/12/2023] [Accepted: 11/15/2023] [Indexed: 12/23/2023] Open
Abstract
BACKGROUND Lipid hydroperoxides (LOOH) have been implicated in skeletal muscle atrophy with age and disuse. Lysophosphatidylcholine acyltransferase 3 (LPCAT3), an enzyme of the Lands cycle, conjugates a polyunsaturated fatty acyl chain to a lysophospholipid to form a polyunsaturated fatty acid containing phospholipid (PUFA-PL) molecule, providing substrates for LOOH propagation. Previous studies suggest that inhibition of the Lands cycle is an effective strategy to suppress LOOH. Mice with skeletal muscle-specific tamoxifen-inducible knockout of LPCAT3 (LPCAT3-MKO) were utilized to determine if muscle-specific attenuation of LOOH may alleviate muscle atrophy and weakness with disuse. METHODS LPCAT3-MKO and control mice underwent 7 days of sham or hindlimb unloading (HU model) to study muscle mass and force-generating capacity. LOOH was assessed by quantifying 4-hydroxynonenal (4-HNE)-conjugated peptides. Quantitative PCR and lipid mass spectrometry were used to validate LPCAT3 deletion. RESULTS Seven days of HU was sufficient to induce muscle atrophy and weakness concomitant to a ~2-fold increase in 4-HNE (P = 0.0069). Deletion of LPCAT3 reversed HU-induced increase in muscle 4-HNE (P = 0.0256). No difference was found in body mass, body composition, or caloric intake between genotypes. The soleus (SOL) and plantaris (PLANT) muscles of the LPCAT3-MKO mice experienced ~15% and ~40% less atrophy than controls, respectively. (P = 0.0011 and P = 0.0265). Type I and IIa SOL myofibers experienced a ~40% decrease in cross sectional area (CSA), which was attenuated to only 15% in the LPCAT3-MKO mice (P = 0.0170 and P = 0.0411, respectively). Strikingly, SOL muscles were fully protected and extensor digitorum longus (EDL) muscles experienced a ~35% protection from HU-induced reduction in force-generating capacity in the LPCAT3-MKO mice compared with controls (P < 0.0001 for both muscles). CONCLUSIONS Our findings demonstrate that attenuation of skeletal muscle lipid hydroperoxides is sufficient to restore its function, in particular a protection from reduction in muscle specific force. Our findings suggest muscle lipid peroxidation contributes to atrophy and weakness induced by disuse in mice.
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Affiliation(s)
- Justin L. Shahtout
- Diabetes and Metabolism Research CenterUniversity of UtahSalt Lake CityUtahUSA
- Department of Physical Therapy and Athletic TrainingUniversity of UtahSalt Lake CityUtahUSA
| | - Hiroaki Eshima
- Diabetes and Metabolism Research CenterUniversity of UtahSalt Lake CityUtahUSA
- Molecular Medicine ProgramUniversity of UtahSalt Lake CityUtahUSA
- Nagasaki International UniversitySaseboJapan
| | - Patrick J. Ferrara
- Diabetes and Metabolism Research CenterUniversity of UtahSalt Lake CityUtahUSA
- Molecular Medicine ProgramUniversity of UtahSalt Lake CityUtahUSA
| | - J. Alan Maschek
- Diabetes and Metabolism Research CenterUniversity of UtahSalt Lake CityUtahUSA
- Metabolomics, Mass Spectrometry, and Proteomics CoreUniversity of UtahSalt Lake CityUtahUSA
| | - James E. Cox
- Diabetes and Metabolism Research CenterUniversity of UtahSalt Lake CityUtahUSA
- Metabolomics, Mass Spectrometry, and Proteomics CoreUniversity of UtahSalt Lake CityUtahUSA
- Department of BiochemistryUniversity of UtahSalt Lake CityUtahUSA
| | - Micah J. Drummond
- Diabetes and Metabolism Research CenterUniversity of UtahSalt Lake CityUtahUSA
- Department of Physical Therapy and Athletic TrainingUniversity of UtahSalt Lake CityUtahUSA
- Molecular Medicine ProgramUniversity of UtahSalt Lake CityUtahUSA
- Department of Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUtahUSA
| | - Katsuhiko Funai
- Diabetes and Metabolism Research CenterUniversity of UtahSalt Lake CityUtahUSA
- Department of Physical Therapy and Athletic TrainingUniversity of UtahSalt Lake CityUtahUSA
- Molecular Medicine ProgramUniversity of UtahSalt Lake CityUtahUSA
- Department of BiochemistryUniversity of UtahSalt Lake CityUtahUSA
- Department of Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUtahUSA
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4
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Zhang H, Du Y, Tang W, Chen M, Yu W, Ke Z, Dong S, Cheng Q. Eldecalcitol prevents muscle loss and osteoporosis in disuse muscle atrophy via NF-κB signaling in mice. Skelet Muscle 2023; 13:22. [PMID: 38115079 PMCID: PMC10729577 DOI: 10.1186/s13395-023-00332-0] [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: 05/01/2023] [Accepted: 11/29/2023] [Indexed: 12/21/2023] Open
Abstract
We investigated the effect of eldecalcitol on disuse muscle atrophy. C57BL/6J male mice aged 6 weeks were randomly assigned to control, tail suspension (TS), and TS-eldecalcitol-treated groups and were injected intraperitoneally twice a week with either vehicle (control and TS) or eldecalcitol at 3.5 or 5 ng for 3 weeks. Grip strength and muscle weights of the gastrocnemius (GAS), tibialis anterior (TA), and soleus (SOL) were determined. Oxidative stress was evaluated by malondialdehyde, superoxide dismutase, glutathione peroxidase, and catalase. Bone microarchitecture was analyzed using microcomputed tomography. The effect of eldecalcitol on C2C12 myoblasts was analyzed by measuring myofibrillar protein MHC and the atrophy markers Atrogin-1 and MuRF-1 using immunofluorescence. The influence of eldecalcitol on NF-κB signaling pathway and vitamin D receptor (VDR) was assessed through immunofluorescence, (co)-immunoprecipitation, and VDR knockdown studies. Eldecalcitol increased grip strength (P < 0.01) and restored muscle loss in GAS, TA, and SOL (P < 0.05 to P < 0.001) induced by TS. An improvement was noted in bone mineral density and bone architecture in the eldecalcitol group. The impaired oxidative defense system was restored by eldecalcitol (P < 0.05 to P < 0.01 vs. TS). Eldecalcitol (10 nM) significantly inhibited the expression of MuRF-1 (P < 0.001) and Atrogin-1 (P < 0.01), increased the diameter of myotubes (P < 0.05), inhibited the expression of P65 and P52 components of NF-κB and P65 nuclear location, thereby inhibiting NF-κB signaling. Eldecalcitol promoted VDR binding to P65 and P52. VDR signaling is required for eldecalcitol-mediated anti-atrophy effects. In conclusion, eldecalcitol exerted its beneficial effects on disuse-induced muscle atrophy via NF-κB inhibition.
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Affiliation(s)
- Haichao Zhang
- Department of Osteoporosis and Bone Disease, Huadong Hospital Affiliated to Fudan University, Research Section of Geriatric Metabolic Bone Disease, Shanghai Geriatric Institute, Shanghai, 200040, People's Republic of China
| | - Yanping Du
- Department of Osteoporosis and Bone Disease, Huadong Hospital Affiliated to Fudan University, Research Section of Geriatric Metabolic Bone Disease, Shanghai Geriatric Institute, Shanghai, 200040, People's Republic of China
| | - Wenjing Tang
- Department of Osteoporosis and Bone Disease, Huadong Hospital Affiliated to Fudan University, Research Section of Geriatric Metabolic Bone Disease, Shanghai Geriatric Institute, Shanghai, 200040, People's Republic of China
| | - Minmin Chen
- Department of Osteoporosis and Bone Disease, Huadong Hospital Affiliated to Fudan University, Research Section of Geriatric Metabolic Bone Disease, Shanghai Geriatric Institute, Shanghai, 200040, People's Republic of China
| | - Weijia Yu
- Department of Osteoporosis and Bone Disease, Huadong Hospital Affiliated to Fudan University, Research Section of Geriatric Metabolic Bone Disease, Shanghai Geriatric Institute, Shanghai, 200040, People's Republic of China
| | - Zheng Ke
- Medical Division, Chugai Pharma China Co., Ltd., Shanghai, 200021, People's Republic of China
| | - Shuangshuang Dong
- Medical Division, Chugai Pharma China Co., Ltd., Shanghai, 200021, People's Republic of China
| | - Qun Cheng
- Department of Osteoporosis and Bone Disease, Huadong Hospital Affiliated to Fudan University, Research Section of Geriatric Metabolic Bone Disease, Shanghai Geriatric Institute, Shanghai, 200040, People's Republic of China.
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5
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Naumova AA, Oleynik EA, Grigorieva YS, Nikolaeva SD, Chernigovskaya EV, Glazova MV. In search of stress: analysis of stress-related markers in mice after hindlimb unloading and social isolation. Neurol Res 2023; 45:957-968. [PMID: 37642364 DOI: 10.1080/01616412.2023.2252280] [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: 03/14/2023] [Accepted: 08/20/2023] [Indexed: 08/31/2023]
Abstract
OBJECTIVES Hindlimb unloading (HU), widely used to simulate microgravity effects, is known to induce a stress response. However, as single-housed animals are usually used in such experiments, social isolation (SI) stress can affect experimental results. In the present study, we aimed to delineate stressful effects of 3-day HU and SI in mice. METHODS Three animal groups, HU, SI, and group-housed (GH) control mice, were recruited. A comprehensive analysis of stress-related markers was performed using ELISA, western blotting, and immunohistochemistry. RESULTS Our results showed that blood corticosterone and activity of glucocorticoid receptors and cAMP response element-binding protein (CREB) in the hippocampus of SI and HU animals did not differ from GH control. However, SI mice demonstrated upregulation of the hippocampal corticotropin-releasing hormone (CRH), inducible NO synthase (iNOS), vesicular glutamate transporter 1 (VGLUT1), and glutamate decarboxylases 65/67 (GAD65/67) along with activation of Fos-related antigen 1 (Fra-1) in the amygdala confirming the expression of stress. In HU mice, the same increase in GAD65/67 and Fra-1 indicated the contribution of SI. The special HU effect was expressed only in neurogenesis attenuation. DISCUSSION Thus, our data indicated that 3-day HU could not be characterized as physiological stress, but SI stress contributed to the negative effects of HU.
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Affiliation(s)
- Alexandra A Naumova
- Sechenov Institute of Evolutionary Physiology and Biochemistry, The Russian Academy of Sciences, St. Petersburg, Russia
| | - Ekaterina A Oleynik
- Sechenov Institute of Evolutionary Physiology and Biochemistry, The Russian Academy of Sciences, St. Petersburg, Russia
- Institute of Lightweight Design and Structural Biomechanics, TU Wien, Vienna, Austria
| | - Yulia S Grigorieva
- Sechenov Institute of Evolutionary Physiology and Biochemistry, The Russian Academy of Sciences, St. Petersburg, Russia
| | - Svetlana D Nikolaeva
- Sechenov Institute of Evolutionary Physiology and Biochemistry, The Russian Academy of Sciences, St. Petersburg, Russia
| | - Elena V Chernigovskaya
- Sechenov Institute of Evolutionary Physiology and Biochemistry, The Russian Academy of Sciences, St. Petersburg, Russia
| | - Margarita V Glazova
- Sechenov Institute of Evolutionary Physiology and Biochemistry, The Russian Academy of Sciences, St. Petersburg, Russia
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Kim BS, Alcantara AV, Moon JH, Higashitani A, Higashitani N, Etheridge T, Szewczyk NJ, Deane CS, Gaffney CJ, Higashibata A, Hashizume T, Yoon KH, Lee JI. Comparative Analysis of Muscle Atrophy During Spaceflight, Nutritional Deficiency and Disuse in the Nematode Caenorhabditis elegans. Int J Mol Sci 2023; 24:12640. [PMID: 37628820 PMCID: PMC10454569 DOI: 10.3390/ijms241612640] [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: 07/20/2023] [Revised: 08/07/2023] [Accepted: 08/07/2023] [Indexed: 08/27/2023] Open
Abstract
While spaceflight is becoming more common than before, the hazards spaceflight and space microgravity pose to the human body remain relatively unexplored. Astronauts experience muscle atrophy after spaceflight, but the exact reasons for this and solutions are unknown. Here, we take advantage of the nematode C. elegans to understand the effects of space microgravity on worm body wall muscle. We found that space microgravity induces muscle atrophy in C. elegans from two independent spaceflight missions. As a comparison to spaceflight-induced muscle atrophy, we assessed the effects of acute nutritional deprivation and muscle disuse on C. elegans muscle cells. We found that these two factors also induce muscle atrophy in the nematode. Finally, we identified clp-4, which encodes a calpain protease that promotes muscle atrophy. Mutants of clp-4 suppress starvation-induced muscle atrophy. Such comparative analyses of different factors causing muscle atrophy in C. elegans could provide a way to identify novel genetic factors regulating space microgravity-induced muscle atrophy.
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Affiliation(s)
- Ban-seok Kim
- Division of Biological Science and Technology, College of Science and Technology, Yonsei University, Wonju 26493, Republic of Korea; (B.-s.K.); (A.V.A.J.); (J.-H.M.)
| | - Alfredo V. Alcantara
- Division of Biological Science and Technology, College of Science and Technology, Yonsei University, Wonju 26493, Republic of Korea; (B.-s.K.); (A.V.A.J.); (J.-H.M.)
| | - Je-Hyun Moon
- Division of Biological Science and Technology, College of Science and Technology, Yonsei University, Wonju 26493, Republic of Korea; (B.-s.K.); (A.V.A.J.); (J.-H.M.)
| | - Atsushi Higashitani
- Graduate School of Life Sciences, Tohoku University, Sendai 980-8577, Japan (N.H.)
| | - Nahoko Higashitani
- Graduate School of Life Sciences, Tohoku University, Sendai 980-8577, Japan (N.H.)
| | - Timothy Etheridge
- Department of Sport and Health Sciences, College of Life and Environmental Sciences, University of Exeter, Exeter EX1 2LU, UK; (T.E.); (C.S.D.)
| | - Nathaniel J. Szewczyk
- Ohio Musculoskeletal and Neurological Institute, Heritage College of Osteopathic Medicine, Ohio University, Athens, OH 45701, USA;
| | - Colleen S. Deane
- Department of Sport and Health Sciences, College of Life and Environmental Sciences, University of Exeter, Exeter EX1 2LU, UK; (T.E.); (C.S.D.)
- Human Development & Health Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK
| | - Christopher J. Gaffney
- Lancaster Medical School, Health Innovation One, Sir John Fisher Drive, Lancaster University, Lancaster LA1 4AT, UK;
| | - Akira Higashibata
- Human Spaceflight Technology Directorate, Japan Aerospace Exploration Agency, Tsukuba 305-0047, Japan
| | - Toko Hashizume
- Advanced Engineering Services Co., Ltd., Tsukuba 305-0032, Japan
| | - Kyoung-hye Yoon
- Department of Physiology, Mitohormesis Research Center, Yonsei University Wonju College of Medicine, Wonju 26426, Republic of Korea;
| | - Jin I. Lee
- Division of Biological Science and Technology, College of Science and Technology, Yonsei University, Wonju 26493, Republic of Korea; (B.-s.K.); (A.V.A.J.); (J.-H.M.)
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7
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Shahtout JL, Eshima H, Ferrara PJ, Maschek JA, Cox JE, Drummond MJ, Funai K. Inhibition of skeletal muscle Lands cycle ameliorates weakness induced by physical inactivity. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.07.25.550576. [PMID: 37546754 PMCID: PMC10402104 DOI: 10.1101/2023.07.25.550576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/08/2023]
Abstract
Background Lipid hydroperoxides (LOOH) have been implicated in skeletal muscle atrophy with age and disuse. Lysophosphatidylcholine acyltransferase 3 (LPCAT3), an enzyme of Lands cycle, conjugates a polyunsaturated fatty acyl chain to a lysophospholipid (PUFA-PL) molecule, providing substrates for LOOH propagation. Previous studies suggest that inhibition of Lands cycle is an effective strategy to suppress LOOH. Mice with skeletal muscle-specific tamoxifen-inducible knockout of LPCAT3 (LPCAT3-MKO) were utilized to determine if muscle-specific attenuation of LOOH may alleviate muscle atrophy and weakness with disuse. Methods LPCAT3-MKO and control mice underwent 7 days of sham or hindlimb unloading (HU model) to study muscle mass and force-generating capacity. LOOH was assessed by quantifying 4-hydroxynonenal (4-HNE)-conjugated peptides. Quantitative PCR and lipid mass spectrometry were used to validate LPCAT3 deletion. Results 7 days of HU was sufficient to induce muscle atrophy and weakness concomitant to an increase in 4-HNE. Deletion of LPCAT3 reversed HU-induced increase in muscle 4HNE. No difference was found in body mass, body composition, or caloric intake between genotypes. The soleus (SOL) and plantaris (PLANT) muscles of the LPCAT3-MKO mice were partially protected from atrophy compared to controls, concomitant to attenuated decrease in cross-sectional areas in type I and IIa fibers. Strikingly, SOL and extensor digitorum longus (EDL) were robustly protected from HU-induced reduction in force-generating capacity in the LPCAT3-MKO mice compared to controls. Conclusion Our findings demonstrate that attenuation of muscle LOOH is sufficient to restore skeletal muscle function, in particular a protection from reduction in muscle specific force. Thus, muscle LOOH contributes to atrophy and weakness induced by HU in mice.
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Affiliation(s)
- Justin L. Shahtout
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, UT, USA
- Department of Physical Therapy and Athletic Training, University of Utah, Salt Lake City, UT, USA
| | - Hiroaki Eshima
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, UT, USA
- Molecular Medicine Program, University of Utah, Salt Lake City, UT, USA
- Nagasaki International University, Sasebo, Nagasaki, Japan
| | - Patrick J. Ferrara
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, UT, USA
- Molecular Medicine Program, University of Utah, Salt Lake City, UT, USA
| | - J. Alan Maschek
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, UT, USA
- Metabolomics, Mass Spectrometry, and Proteomics Core, University of Utah, Salt Lake City, UT. USA
| | - James E. Cox
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, UT, USA
- Metabolomics, Mass Spectrometry, and Proteomics Core, University of Utah, Salt Lake City, UT. USA
- Department of Biochemistry, University of Utah, Salt Lake City, UT, USA
| | - Micah J. Drummond
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, UT, USA
- Department of Physical Therapy and Athletic Training, University of Utah, Salt Lake City, UT, USA
- Molecular Medicine Program, University of Utah, Salt Lake City, UT, USA
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Katsuhiko Funai
- Diabetes and Metabolism Research Center, University of Utah, Salt Lake City, UT, USA
- Department of Physical Therapy and Athletic Training, University of Utah, Salt Lake City, UT, USA
- Molecular Medicine Program, University of Utah, Salt Lake City, UT, USA
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
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8
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Reidy PT, Smith AD, Jevnikar BE, Doctor AK, Williams RW, Kachulkin AA, Monnig JM, Fix DK, Petrocelli JJ, Mahmassani ZS, McKenzie AI, de Hart NMMP, Drummond MJ. Muscle disuse as hindlimb unloading in early postnatal mice negatively impacts grip strength in adult mice: a pilot study. J Appl Physiol (1985) 2023; 134:787-798. [PMID: 36759163 PMCID: PMC10042595 DOI: 10.1152/japplphysiol.00681.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 01/24/2023] [Accepted: 02/06/2023] [Indexed: 02/11/2023] Open
Abstract
Physical inactivity has many detrimental effects on health, yet the impact of physical inactivity in early life on muscle health in adulthood remains unknown. Early postnatal malnutrition has prolonged effects into adulthood and we propose that early postnatal (P) physical inactivity would have similar negative effects. To test this hypothesis, we exposed postnatal mice (∼P28, C57BL/6J) to 14 days of physical inactivity (shortly after weaning, from ∼P28 to P42 days of age) in the form of muscle disuse with hindlimb unloading (HU). After this early-life physical inactivity, they were allowed to normally ambulate until 5 mo of age (P140, adulthood) when they underwent 14 days of HU with and without 7-day recovery. They were then tested for physical function (grip strength) and muscles were extracted and weighed. Immunofluorescence was carried out on these muscle cross sections for analysis of myofiber cross-sectional area (fCSA), macrophage density (CD68+ cells), and extracellular matrix (ECM) area. Muscle weights and fCSA and myofiber diameter were used to quantify changes in muscle and fiber size. Compared with age-matched controls, no notable effects of early-life physical inactivity (HU) on skeletal muscle and myofiber size were observed. However, a significant reduction in adult grip strength was observed in those exposed to HU early in life. This was associated with reduced muscle macrophages and increased ECM area. Exposure to a short period of early life disuse has negative enduring effects into adulthood impacting grip strength, muscle macrophages, and muscle composition as low muscle quality.NEW & NOTEWORTHY We demonstrate that early life disuse resulted in less grip strength in adulthood. Analysis of muscle composition demonstrated no loss of whole muscle or myofiber size indicating lower muscle quality akin to premature aging. This poor muscle quality was characterized by altered muscle macrophages and extracellular matrix area. We demonstrate intriguing correlations between this loss of grip strength and muscle macrophages and also area of noncontractile tissue in the muscle.
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Affiliation(s)
- Paul T Reidy
- Department of Kinesiology, Nutrition and Health, Miami University, Oxford, Ohio, United States
| | - Austin D Smith
- Department of Kinesiology, Nutrition and Health, Miami University, Oxford, Ohio, United States
| | - Benjamin E Jevnikar
- Department of Kinesiology, Nutrition and Health, Miami University, Oxford, Ohio, United States
| | - Abbas K Doctor
- Department of Kinesiology, Nutrition and Health, Miami University, Oxford, Ohio, United States
| | - Ryan W Williams
- Department of Kinesiology, Nutrition and Health, Miami University, Oxford, Ohio, United States
| | - Anthony A Kachulkin
- Department of Kinesiology, Nutrition and Health, Miami University, Oxford, Ohio, United States
| | - Jackie M Monnig
- Department of Kinesiology, Nutrition and Health, Miami University, Oxford, Ohio, United States
| | - Dennis K Fix
- Department of Physical Therapy & Athletic Training, University of Utah, Salt Lake City, Utah, United States
| | - Jonathan J Petrocelli
- Department of Physical Therapy & Athletic Training, University of Utah, Salt Lake City, Utah, United States
| | - Ziad S Mahmassani
- Department of Physical Therapy & Athletic Training, University of Utah, Salt Lake City, Utah, United States
| | - Alec I McKenzie
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, United States
| | - Naomi M M P de Hart
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah, United States
| | - Micah J Drummond
- Department of Physical Therapy & Athletic Training, University of Utah, Salt Lake City, Utah, United States
- Molecular Medicine Program, University of Utah, Salt Lake City, Utah, United States
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Changes in the Mechanical Properties of Fast and Slow Skeletal Muscle after 7 and 21 Days of Restricted Activity in Rats. Int J Mol Sci 2023; 24:ijms24044141. [PMID: 36835551 PMCID: PMC9966780 DOI: 10.3390/ijms24044141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 02/13/2023] [Accepted: 02/16/2023] [Indexed: 02/22/2023] Open
Abstract
Disuse muscle atrophy is usually accompanied by changes in skeletal muscle structure, signaling, and contractile potential. Different models of muscle unloading can provide valuable information, but the protocols of experiments with complete immobilization are not physiologically representative of a sedentary lifestyle, which is highly prevalent among humans now. In the current study, we investigated the potential effects of restricted activity on the mechanical characteristics of rat postural (soleus) and locomotor (extensor digitorum longus, EDL) muscles. The restricted-activity rats were kept in small Plexiglas cages (17.0 × 9.6 × 13.0 cm) for 7 and 21 days. After this, soleus and EDL muscles were collected for ex vivo mechanical measurements and biochemical analysis. We demonstrated that while a 21-day movement restriction affected the weight of both muscles, in soleus muscle we observed a greater decrease. The maximum isometric force and passive tension in both muscles also significantly changed after 21 days of movement restriction, along with a decrease in the level of collagen 1 and 3 mRNA expression. Furthermore, the collagen content itself changed only in soleus after 7 and 21 days of movement restriction. With regard to cytoskeletal proteins, in our experiment we observed a significant decrease in telethonin in soleus, and a similar decrease in desmin and telethonin in EDL. We also observed a shift towards fast-type myosin heavy chain expression in soleus, but not in EDL. In summary, in this study we showed that movement restriction leads to profound specific changes in the mechanical properties of fast and slow skeletal muscles. Future studies may include evaluation of signaling mechanisms regulating the synthesis, degradation, and mRNA expression of the extracellular matrix and scaffold proteins of myofibers.
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