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Park S, Cha HN, Shin MG, Park S, Kim Y, Kim MS, Shin KH, Thoudam T, Lee EJ, Wolfe RR, Dan J, Koh JH, Kim IY, Choi I, Lee IK, Sung HK, Park SY. Inhibitory Regulation of FOXO1 in PPARδ Expression Drives Mitochondrial Dysfunction and Insulin Resistance. Diabetes 2024; 73:1084-1098. [PMID: 38656552 DOI: 10.2337/db23-0432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Accepted: 04/09/2024] [Indexed: 04/26/2024]
Abstract
Forkhead box O1 (FOXO1) regulates muscle growth, but the metabolic role of FOXO1 in skeletal muscle and its mechanisms remain unclear. To explore the metabolic role of FOXO1 in skeletal muscle, we generated skeletal muscle-specific Foxo1 inducible knockout (mFOXO1 iKO) mice and fed them a high-fat diet to induce obesity. We measured insulin sensitivity, fatty acid oxidation, mitochondrial function, and exercise capacity in obese mFOXO1 iKO mice and assessed the correlation between FOXO1 and mitochondria-related protein in the skeletal muscle of patients with diabetes. Obese mFOXO1 iKO mice exhibited improved mitochondrial respiratory capacity, which was followed by attenuated insulin resistance, enhanced fatty acid oxidation, and improved skeletal muscle exercise capacity. Transcriptional inhibition of FOXO1 in peroxisome proliferator-activated receptor δ (PPARδ) expression was confirmed in skeletal muscle, and deletion of PPARδ abolished the beneficial effects of FOXO1 deficiency. FOXO1 protein levels were higher in the skeletal muscle of patients with diabetes and negatively correlated with PPARδ and electron transport chain protein levels. These findings highlight FOXO1 as a new repressor in PPARδ gene expression in skeletal muscle and suggest that FOXO1 links insulin resistance and mitochondrial dysfunction in skeletal muscle via PPARδ. ARTICLE HIGHLIGHTS
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Affiliation(s)
- Soyoung Park
- Department of Physiology, College of Medicine, Yeungnam University, Daegu, Republic of Korea
- Senotherapy-Based Metabolic Diseases Control Research Center, College of Medicine, Yeungnam University, Daegu, Republic of Korea
| | - Hye-Na Cha
- Department of Physiology, College of Medicine, Yeungnam University, Daegu, Republic of Korea
- Senotherapy-Based Metabolic Diseases Control Research Center, College of Medicine, Yeungnam University, Daegu, Republic of Korea
| | - Min-Gyeong Shin
- Department of Physiology, College of Medicine, Yeungnam University, Daegu, Republic of Korea
| | - Sanghee Park
- Department of Molecular Medicine, College of Medicine, Gachon University, Incheon, Republic of Korea
| | - Yeongmin Kim
- Department of Health Sciences and Technology, Gachon Advanced Institute for Health Sciences and Technology, Gachon University, Incheon, Republic of Korea
| | - Min-Seob Kim
- Department of Fundamental Environment Research, Environmental Measurement and Analysis Center, National Institute of Environmental Research, Incheon, Republic of Korea
| | - Kyung-Hoon Shin
- Department of Marine Sciences and Convergent Technology, Hanyang University, Ansan, Republic of Korea
| | - Themis Thoudam
- Research Institute of Aging and Metabolism, Kyungpook National University, Daegu, Republic of Korea
| | - Eun Ju Lee
- Department of Medical Biotechnology, Yeungnam University, Gyeongsan, Republic of Korea
| | - Robert R Wolfe
- Department of Geriatrics, University of Arkansas for Medical Sciences, Little Rock, AR
| | - Jinmyoung Dan
- Department of Orthopedic Surgery, College of Medicine, CHA University, Gumi, Republic of Korea
| | - Jin-Ho Koh
- Department of Convergence Medicine, Wonju College of Medicine, Yonsei University, Wonju, Republic of Korea
| | - Il-Young Kim
- Department of Molecular Medicine, College of Medicine, Gachon University, Incheon, Republic of Korea
| | - Inho Choi
- Department of Medical Biotechnology, Yeungnam University, Gyeongsan, Republic of Korea
| | - In-Kyu Lee
- Research Institute of Aging and Metabolism, Kyungpook National University, Daegu, Republic of Korea
- Department of Internal Medicine, School of Medicine, Kyungpook National University, Kyungpook National University Hospital, Daegu, Republic of Korea
| | - Hoon-Ki Sung
- The Hospital for Sick Children Research Institute & Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | - So-Young Park
- Department of Physiology, College of Medicine, Yeungnam University, Daegu, Republic of Korea
- Senotherapy-Based Metabolic Diseases Control Research Center, College of Medicine, Yeungnam University, Daegu, Republic of Korea
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Broome HAO, Woods-Lee GRT, Flanagan J, Biourge V, German AJ. Weight loss outcomes are generally worse for dogs and cats with class II obesity, defined as > 40% overweight. Sci Rep 2023; 13:22958. [PMID: 38151525 PMCID: PMC10752889 DOI: 10.1038/s41598-023-50197-y] [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: 08/09/2023] [Accepted: 12/16/2023] [Indexed: 12/29/2023] Open
Abstract
In pet dogs and cats, adiposity is most-often estimated clinically using a 9-category body condition score (BCS), with BCS 9 equating to ~ 40% overweight. Animals that are more overweight (> 40%) are seen in clinical practice but are not appropriately depicted by descriptions in the existing categories. To determine whether being > 40% overweight has clinical relevance, this study aimed to compare the outcomes of weight management in animals that were > 40% overweight with those < 40% overweight. Records of dogs and cats attending a specialist obesity care clinic, where adiposity is determined using dual-energy X-ray absorptiometry (DXA), were reviewed. Animals were assigned to two classes (class I ≤ 40% overweight: 118/398 [40%] dogs and 68/116 [59%] cats; class II, > 40% overweight: 180/398 [60%] dogs and 48/116 [41%] cats) based on DXA results, and weight loss outcomes were compared. Fewer class II dogs obesity completed weight management than class I dogs (P < 0.001), rate of weight loss was also slower (P = 0.012) and lean tissue loss greater (P < 0.001). Compared with class I, cats with class II obesity lost more weight (P = 0.048) albeit over a longer period (P = 0.043) leading to greater lean tissue loss (P = 0.004). Approximately half the pets presenting to a specialist clinic were have class II obesity (> 40% overweight), and some weight loss outcomes are worse for these animals.
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Affiliation(s)
- H A O Broome
- Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, UK
| | - G R T Woods-Lee
- Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, UK
| | - J Flanagan
- Royal Canin Research Centre, Aimargues, France
| | - V Biourge
- Royal Canin Research Centre, Aimargues, France
| | - A J German
- Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, UK.
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Aslam MA, Ma EB, Huh JY. Pathophysiology of sarcopenia: Genetic factors and their interplay with environmental factors. Metabolism 2023; 149:155711. [PMID: 37871831 DOI: 10.1016/j.metabol.2023.155711] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 10/05/2023] [Accepted: 10/17/2023] [Indexed: 10/25/2023]
Abstract
Sarcopenia is a geriatric disorder characterized by a progressive decline in muscle mass and function. This disorder has been associated with a range of adverse health outcomes, including fractures, functional deterioration, and increased mortality. The pathophysiology of sarcopenia is highly complex and multifactorial, involving both genetic and environmental factors as key contributors. This review consolidates current knowledge on the genetic factors influencing the pathogenesis of sarcopenia, particularly focusing on the altered gene expression of structural and metabolic proteins, growth factors, hormones, and inflammatory cytokines. While the influence of environmental factors such as physical inactivity, chronic diseases, smoking, alcohol consumption, and sleep disturbances on sarcopenia is relatively well understood, there is a dearth of studies examining their mechanistic roles. Therefore, this review emphasizes the interplay between genetic and environmental factors, elucidating their cumulative role in exacerbating the progression of sarcopenia beyond their individual effects. The unique contribution of this review lies in synthesizing the latest evidence on the genetic factors and their interaction with environmental factors, aiming to inform the development of novel therapeutic or preventive interventions for sarcopenia.
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Affiliation(s)
- Muhammad Arif Aslam
- College of Pharmacy, Chonnam National University, Gwangju, Republic of Korea
| | - Eun Bi Ma
- College of Pharmacy, Chonnam National University, Gwangju, Republic of Korea
| | - Joo Young Huh
- College of Pharmacy, Chonnam National University, Gwangju, Republic of Korea.
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Zhao Y, Chen C, Pan J, Lam SM, Shui G, Yang S, Wu T, Yang N, Tao C, Zhao J, Wang Y. Adipocyte Rnf20 ablation increases the fast-twitch fibers of skeletal muscle via lysophosphatidylcholine 16:0. Cell Mol Life Sci 2023; 80:243. [PMID: 37555936 PMCID: PMC11072846 DOI: 10.1007/s00018-023-04896-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 07/20/2023] [Accepted: 07/23/2023] [Indexed: 08/10/2023]
Abstract
Both adipose tissue and skeletal muscle are highly dynamic tissues and interact at the metabolic and hormonal levels in response to internal and external stress, and they coordinate in maintaining whole-body metabolic homeostasis. In our previous study, we revealed that adipocyte-specific Rnf20 knockout mice (ASKO mice) exhibited lower fat mass but higher lean mass, providing a good model for investigating the adipose-muscle crosstalk and exploring the effect of the adipocyte Rnf20 gene on the physiology and metabolism of skeletal muscle. Here, we confirmed that ASKO mice exhibited the significantly increased body weight and gastrocnemius muscle weight. Fiber-type switching in the soleus muscle of ASKO mice was observed, as evidenced by the increased number of fast-twitch fibers and decreased number of slow-twitch fibers. Serum metabolites with significant alteration in abundance were identified by metabolomic analysis and the elevated lysophosphatidylcholine 16:0 [LysoPC (16:0)] was observed in ASKO mice. In addition, lipidome analysis of gonadal white adipose tissue revealed a significant increase in LysoPCs and LysoPC (16:0) in ASKO mice. Furthermore, knockdown of Rnf20 gene in 3T3-L1 cells significantly increased the secretion of LysoPC, suggesting that LysoPC might be a critical metabolite in the adipose-muscle crosstalk of ASKO mice. Furthermore, in vitro study demonstrated that LysoPC (16:0) could induce the expression of fast-twitch muscle fibers related genes in differentiated C2C12 cells, indicating its potential role in adipose-muscle crosstalk. Taken together, these findings not only expand our understanding of the biological functions of Rnf20 gene in systemic lipid metabolism, but also provide insight into adipose tissue dysfunction-induced physiological alterations in skeletal muscle.
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Affiliation(s)
- Ying Zhao
- State Key Laboratory of Animal Biotech Breeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
- College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China
| | - Chuanhe Chen
- State Key Laboratory of Animal Biotech Breeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
- College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China
| | - Jianfei Pan
- State Key Laboratory of Animal Biotech Breeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
| | - Sin Man Lam
- Institute of Genetics and Development Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Guanghou Shui
- Institute of Genetics and Development Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Shulin Yang
- State Key Laboratory of Animal Biotech Breeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Tianwen Wu
- State Key Laboratory of Animal Biotech Breeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Ning Yang
- College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China
| | - Cong Tao
- State Key Laboratory of Animal Biotech Breeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
| | - Jianguo Zhao
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China.
- Savaid Medical School, University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Yanfang Wang
- State Key Laboratory of Animal Biotech Breeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China.
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China.
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Abstract
Muscle wasting (ie, atrophy) is a serious consequence of chronic kidney disease (CKD) that reduces muscle strength and function. It reduces the quality of life for CKD patients and increases the risks of comorbidities and mortality. Current treatment strategies to prevent or reverse skeletal muscle loss are limited owing to the broad and systemic nature of the initiating signals and the multifaceted catabolic mechanisms that accelerate muscle protein degradation and impair protein synthesis and repair pathways. Recent evidence has shown how organs such as muscle, adipose, and kidney communicate with each other through interorgan exchange of proteins and RNAs during CKD. This crosstalk changes cell functions in the recipient organs and represents an added dimension in the complex processes that are responsible for muscle atrophy in CKD. This complexity creates challenges for the development of effective therapies to ameliorate muscle wasting and weakness in patients with CKD.
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Affiliation(s)
- Xiaonan H Wang
- Renal Division, Department of Medicine, Emory University, Atlanta, GA
| | - S Russ Price
- Department of Biochemistry and Molecular Biology, Brody School of Medicine, East Carolina University, Greenville, NC; Department of Internal Medicine, Brody School of Medicine, East Carolina University, Greenville, NC.
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Kim JW, Shin SK, Kwon EY. Luteolin Protects Against Obese Sarcopenia in Mice with High-Fat Diet-Induced Obesity by Ameliorating Inflammation and Protein Degradation in Muscles. Mol Nutr Food Res 2023; 67:e2200729. [PMID: 36708177 DOI: 10.1002/mnfr.202200729] [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: 10/25/2022] [Revised: 01/04/2023] [Indexed: 01/29/2023]
Abstract
SCOPE Although sarcopenia is mainly caused by aging, sarcopenia due to obesity has become an emerging issue given the increase in obesity among people of various ages. There are studies on obesity or sarcopenia, our understanding of obesity-mediated sarcopenia is insufficient. Luteolin (LU) has exhibited antiobesity effects, but no studies have investigated the LU effects on antisarcopenia. This study therefore investigated the effects of LU on obese sarcopenia in mice with high-fat diet (HFD)-induced obesity. METHODS AND RESULTS To evaluate its inhibitory efficacy against obese sarcopenia, 5-week-old mice are fed an HFD supplemented with LU for 20 weeks. LU exerts suppressive effects on obesity, inflammation, and protein degradation in the HFD-fed obese mice. It also inhibits lipid infiltration into the muscle and decreases p38 activity and the mRNA expression of inflammatory factors, including TNF-α, Tlr2, Tlr4, MCP1, and MMP2, in the muscle. The suppression of muscle inflammation by LU leads to the inhibition of myostatin, FoxO, atrogin, and MuRF expression. These effects of LU affect inhibition of protein degradation and improvement of muscle function. CONCLUSION Here, it demonstrates that LU's antiobesity and antiinflammatory functionality affect inhibition of muscle protein degradation, and consequently, these interactions by LU exerts a protective effect against obese sarcopenia.
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Affiliation(s)
- Ji-Won Kim
- Department of Food Science and Nutrition, Kyungpook National University, 80, Daehak-ro, Buk-Ku, Daegu, 41566, Republic of Korea
- Center for Food and Nutritional Genomics Research, Kyungpook National University, 80, Daehak-ro, Buk-Ku, Daegu, 41566, Republic of Korea
| | - Su-Kyung Shin
- Department of Food Science and Nutrition, Kyungpook National University, 80, Daehak-ro, Buk-Ku, Daegu, 41566, Republic of Korea
- Center for Food and Nutritional Genomics Research, Kyungpook National University, 80, Daehak-ro, Buk-Ku, Daegu, 41566, Republic of Korea
| | - Eun-Young Kwon
- Department of Food Science and Nutrition, Kyungpook National University, 80, Daehak-ro, Buk-Ku, Daegu, 41566, Republic of Korea
- Center for Food and Nutritional Genomics Research, Kyungpook National University, 80, Daehak-ro, Buk-Ku, Daegu, 41566, Republic of Korea
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Kim HJ, Kwon O. Aerobic exercise prevents apoptosis in skeletal muscles of high-fat-fed ovariectomized rats. Phys Act Nutr 2022; 26:1-7. [PMID: 35982623 PMCID: PMC9395254 DOI: 10.20463/pan.2022.0007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Accepted: 05/02/2022] [Indexed: 11/22/2022] Open
Abstract
[Purpose] Aging and obesity are associated with skeletal muscle atrophy-related signaling pathways, including apoptosis. Many studies have shown that menopause is associated with an increased risk of skeletal muscle atrophy. There is an increasing need to develop strategies that will improve the risk of skeletal muscle atrophy through exercise interventions. However, the effect of exercise on estrogen deficiency-induced apoptosis in skeletal muscles is poorly understood. Therefore, we examined the effects of low-intensity exercise on ovariectomy (OVX)-induced apoptosis of the soleus and plantaris muscles. [Methods] The ovaries of all female Sprague-Dawley rats aged 8 weeks, were surgically removed to induce postmenopausal status. The rats were randomly divided into three treatment groups: (1) NSV (normal-diet-sedentary-OVX); (2) HSV (high-fat-diet-sedentary-OVX); and (3) HEV (high-fat-diet-exercise-OVX). The exercise groups were regularly running for 30-40 min/day at 15-18 m/minute, five times/week, for eight weeks. [Results] The mRNA levels of Bax significantly decreased in the exercised soleus muscle, and caspase-3 decreased in the plantaris. The skeletal muscle TUNEL-positive apoptotic cells in the high-fat-diet-sedentary OVX rats improved in the treadmill exercise group. Additionally, nuclear caspase-3 levels decreased in the treadmill exercise group compared to those in both sedentary groups. These results suggest that low-intensity treadmill exercise prevents skeletal muscle apoptosis in HFD-fed OVX rats. [Conclusion] Induction of HFD in estrogen-deficient mice increased apoptosis in skeletal muscle, which could also be alleviated by low-intensity aerobic exercise. These results may indicate a crucial therapeutic effect of treadmill exercise in preventing skeletal muscle apoptosis in menopausal or post-menopausal women.
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Sabaratnam R, Skov V, Paulsen SK, Juhl S, Kruse R, Hansen T, Halkier C, Kristensen JM, Vind BF, Richelsen B, Knudsen S, Dahlgaard J, Beck-Nielsen H, Kruse TA, Højlund K. A Signature of Exaggerated Adipose Tissue Dysfunction in Type 2 Diabetes Is Linked to Low Plasma Adiponectin and Increased Transcriptional Activation of Proteasomal Degradation in Muscle. Cells 2022; 11:cells11132005. [PMID: 35805088 PMCID: PMC9265693 DOI: 10.3390/cells11132005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2022] [Revised: 06/12/2022] [Accepted: 06/21/2022] [Indexed: 01/27/2023] Open
Abstract
Insulin resistance in skeletal muscle in type 2 diabetes (T2D) is characterized by more pronounced metabolic and molecular defects than in obesity per se. There is increasing evidence that adipose tissue dysfunction contributes to obesity-induced insulin resistance in skeletal muscle. Here, we used an unbiased approach to examine if adipose tissue dysfunction is exaggerated in T2D and linked to diabetes-related mechanisms of insulin resistance in skeletal muscle. Transcriptional profiling and biological pathways analysis were performed in subcutaneous adipose tissue (SAT) and skeletal muscle biopsies from 17 patients with T2D and 19 glucose-tolerant, age and weight-matched obese controls. Findings were validated by qRT-PCR and western blotting of selected genes and proteins. Patients with T2D were more insulin resistant and had lower plasma adiponectin than obese controls. Transcriptional profiling showed downregulation of genes involved in mitochondrial oxidative phosphorylation and the tricarboxylic-acid cycle and increased expression of extracellular matrix (ECM) genes in SAT in T2D, whereas genes involved in proteasomal degradation were upregulated in the skeletal muscle in T2D. qRT-PCR confirmed most of these findings and showed lower expression of adiponectin in SAT and higher expression of myostatin in muscle in T2D. Interestingly, muscle expression of proteasomal genes correlated positively with SAT expression of ECM genes but inversely with the expression of ADIPOQ in SAT and plasma adiponectin. Protein content of proteasomal subunits and major ubiquitin ligases were unaltered in the skeletal muscle of patients with T2D. A transcriptional signature of exaggerated adipose tissue dysfunction in T2D, compared with obesity alone, is linked to low plasma adiponectin and increased transcriptional activation of proteasomal degradation in skeletal muscle.
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Affiliation(s)
- Rugivan Sabaratnam
- Steno Diabetes Center Odense, Odense University Hospital, DK-5000 Odense C, Denmark; (R.S.); (S.J.); (R.K.); (J.M.K.); (B.F.V.); (H.B.-N.)
- Department of Clinical Research, University of Southern Denmark, DK-5000 Odense C, Denmark; (T.H.); (C.H.)
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of Medicine, University of Oxford, Oxford OX3 7LE, UK
| | - Vibe Skov
- Department of Hematology, Zealand University Hospital, DK-4000 Roskilde, Denmark;
| | - Søren K. Paulsen
- Department of Pathology, Viborg Regional Hospital, DK-8800 Viborg, Denmark;
| | - Stine Juhl
- Steno Diabetes Center Odense, Odense University Hospital, DK-5000 Odense C, Denmark; (R.S.); (S.J.); (R.K.); (J.M.K.); (B.F.V.); (H.B.-N.)
- Department of Clinical Research, University of Southern Denmark, DK-5000 Odense C, Denmark; (T.H.); (C.H.)
| | - Rikke Kruse
- Steno Diabetes Center Odense, Odense University Hospital, DK-5000 Odense C, Denmark; (R.S.); (S.J.); (R.K.); (J.M.K.); (B.F.V.); (H.B.-N.)
- Department of Clinical Research, University of Southern Denmark, DK-5000 Odense C, Denmark; (T.H.); (C.H.)
| | - Thea Hansen
- Department of Clinical Research, University of Southern Denmark, DK-5000 Odense C, Denmark; (T.H.); (C.H.)
| | - Cecilie Halkier
- Department of Clinical Research, University of Southern Denmark, DK-5000 Odense C, Denmark; (T.H.); (C.H.)
| | - Jonas M. Kristensen
- Steno Diabetes Center Odense, Odense University Hospital, DK-5000 Odense C, Denmark; (R.S.); (S.J.); (R.K.); (J.M.K.); (B.F.V.); (H.B.-N.)
- Molecular Physiology Section, Department of Nutrition, Exercise and Sports, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Birgitte F. Vind
- Steno Diabetes Center Odense, Odense University Hospital, DK-5000 Odense C, Denmark; (R.S.); (S.J.); (R.K.); (J.M.K.); (B.F.V.); (H.B.-N.)
| | - Bjørn Richelsen
- Steno Diabetes Center Aarhus, Aarhus University Hospital, DK-8200 Aarhus N, Denmark;
| | - Steen Knudsen
- Allarity Therapeutics Europe, DK-2970 Hørsholm, Denmark;
| | - Jesper Dahlgaard
- Program for Mind and Body in Mental Health, Research Centre for Health and Welfare Technology, VIA University College, DK-8200 Aarhus, Denmark;
- Department of Clinical Medicine, Aarhus University, DK-8200 Aarhus, Denmark
| | - Henning Beck-Nielsen
- Steno Diabetes Center Odense, Odense University Hospital, DK-5000 Odense C, Denmark; (R.S.); (S.J.); (R.K.); (J.M.K.); (B.F.V.); (H.B.-N.)
| | - Torben A. Kruse
- Department of Clinical Genetics, Odense University Hospital, DK-5000 Odense C, Denmark;
| | - Kurt Højlund
- Steno Diabetes Center Odense, Odense University Hospital, DK-5000 Odense C, Denmark; (R.S.); (S.J.); (R.K.); (J.M.K.); (B.F.V.); (H.B.-N.)
- Department of Clinical Research, University of Southern Denmark, DK-5000 Odense C, Denmark; (T.H.); (C.H.)
- Correspondence: ; Tel.: +45-2532-0648
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Bao X, Xu B, Yin S, Pan J, Nilsson PM, Nilsson J, Melander O, Orho-Melander M, Engström G. Proteomic Profiles of Body Mass Index and Waist-to-Hip Ratio and Their Role in Incidence of Diabetes. J Clin Endocrinol Metab 2022; 107:e2982-e2990. [PMID: 35294966 PMCID: PMC9202718 DOI: 10.1210/clinem/dgac140] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Indexed: 12/13/2022]
Abstract
CONTEXT It is unclear to what extent the plasma proteome of abdominal fat distribution differs from that of body mass index, and whether the differences have clinical implications. OBJECTIVE To evaluate the difference between the plasma proteomic profiles of body mass index (BMI) and waist-to-hip ratio (WHR), and then examine the identified BMI- or WHR-specific proteins in relation to incidence of diabetes. METHODS Data were obtained from the Malmö Diet and Cancer-Cardiovascular Cohort study in the general community. Participants (n = 4203) with no previous diabetes (aged 57.2 ± 6.0 years, 37.8% men) were included. Plasma proteins (n = 136) were measured by the Proseek proximity extension method. BMI- and WHR-specific proteins were identified at baseline using a 2-step iterative resampling approach to optimize internal replicability followed by β coefficient comparisons. The identified proteins were considered internally replicated and were then studied in relation to incident diabetes by Cox proportional hazards regression analysis. The main outcome measure was incident diabetes over a mean follow-up of 20.3 ± 5.9 years. RESULTS After excluding 21 overlapping proteins and proteins that did not show significantly different associations with BMI vs WHR, 10 internally replicated proteins were found to be specific to BMI, and 22 were found to be specific to WHR (false discovery rate-adjusted P < .05). Of the WHR-specific proteins, 18 remained associated with diabetes risk after multivariate adjustments, whereas none of the BMI-specific proteins showed associations with diabetes risk. CONCLUSION Abdominal fat distribution was associated with some unique characteristics of the plasma proteome that potentially could be related to its additional risk of diabetes beyond general obesity.
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Affiliation(s)
- Xue Bao
- Department of Cardiology, Nanjing Drum Tower Hospital, the Affiliated Hospital of Nanjing University Medical School, Nanjing, China
- Department of Clinical Sciences, Malmö, Lund University, Malmö, Sweden
| | - Biao Xu
- Correspondence: Biao Xu, Department of Cardiology, Drum Tower Hospital, Medical School of Nanjing University, No. 321 Zhongshan Road, Nanjing, 210008, China.
| | - Songjiang Yin
- The First Clinical Medical College, Nanjing University of Chinese Medicine, Nanjing, China
| | - Jingxue Pan
- Department of Clinical Sciences, Malmö, Lund University, Malmö, Sweden
| | - Peter M Nilsson
- Department of Clinical Sciences, Malmö, Lund University, Malmö, Sweden
| | - Jan Nilsson
- Department of Clinical Sciences, Malmö, Lund University, Malmö, Sweden
| | - Olle Melander
- Department of Clinical Sciences, Malmö, Lund University, Malmö, Sweden
| | | | - Gunnar Engström
- Gunnar Engström, Department of Clinical Sciences, Lund University, CRC 60:13, Jan Waldenströms gata 35, 205 02 Malmö, Sweden.
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10
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Xu Z, Chen W, Wang L, You W, Wang Y, Wang Y, Zhao J, Shan T. UCP1 Knockin Induces Lipid Dynamics and Transcriptional Programs in the Skeletal Muscles of Pigs. Front Cell Dev Biol 2022; 9:808095. [PMID: 35096834 PMCID: PMC8790096 DOI: 10.3389/fcell.2021.808095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 12/07/2021] [Indexed: 02/02/2023] Open
Abstract
Uncoupling protein 1 (UCP1), the hallmark protein responsible for nonshivering thermogenesis in adipose tissue (especially brown adipose tissue) has regained researchers' attention in the context of metabolic disorders following the realization that UCP1 can be activated in adult humans and reconstituted in pigs. Both skeletal muscle and adipose tissue are highly dynamic tissues that interact at the metabolic and hormonal level in response to internal and external stress, and they coordinate in maintaining whole-body metabolic homeostasis. Here, we utilized lipidomics and transcriptomics to identify the altered lipid profiles and regulatory pathways in skeletal muscles from adipocyte-specific UCP1 knock-in (KI) pigs. UCP1 KI changed the contents of glycerophospholipids and acyl carnitines of skeletal muscles. Several metabolic regulatory pathways were more enriched in the UCP1 KI skeletal muscle. Comparison of the transcriptomes of adipose and skeletal muscle suggested that nervous system or chemokine signaling might account for the crosstalk between these two tissues in UCP1 KI pigs. Comparison of the lipid biomarkers from UCP1 KI pigs and other mammals suggested associations between UCP1 KI-induced metabolic alternations and metabolic and muscle dysfunction. Our study reveals the lipid dynamics and transcriptional programs in the skeletal muscle of UCP1 KI pigs and suggests that a network regulates metabolic homeostasis between skeletal muscle and adipose tissue.
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Affiliation(s)
- Ziye Xu
- College of Animal Sciences, Zhejiang University, Hangzhou, China.,Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Zhejiang University, Hangzhou, China.,Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Zhejiang University, Hangzhou, China
| | - Wentao Chen
- College of Animal Sciences, Zhejiang University, Hangzhou, China.,Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Zhejiang University, Hangzhou, China.,Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Zhejiang University, Hangzhou, China
| | - Liyi Wang
- College of Animal Sciences, Zhejiang University, Hangzhou, China.,Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Zhejiang University, Hangzhou, China.,Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Zhejiang University, Hangzhou, China
| | - Wenjing You
- College of Animal Sciences, Zhejiang University, Hangzhou, China.,Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Zhejiang University, Hangzhou, China.,Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Zhejiang University, Hangzhou, China
| | - Yanfang Wang
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Yizhen Wang
- College of Animal Sciences, Zhejiang University, Hangzhou, China.,Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Zhejiang University, Hangzhou, China
| | - Jianguo Zhao
- Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Tizhong Shan
- College of Animal Sciences, Zhejiang University, Hangzhou, China.,Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Zhejiang University, Hangzhou, China.,Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Zhejiang University, Hangzhou, China
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11
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Bamba R, Okamura T, Hashimoto Y, Majima S, Senmaru T, Ushigome E, Nakanishi N, Asano M, Yamazaki M, Takakuwa H, Hamaguchi M, Fukui M. Extracellular lipidome change by an SGLT2 inhibitor, luseogliflozin, contributes to prevent skeletal muscle atrophy in db/db mice. J Cachexia Sarcopenia Muscle 2022; 13:574-588. [PMID: 34854254 PMCID: PMC8818690 DOI: 10.1002/jcsm.12814] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 08/18/2021] [Accepted: 09/04/2021] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND Diabetes mellitus increases the excretion of urinary glucose from the renal glomeruli due to elevated blood glucose levels. In the renal tubules, SGLT2 is expressed and reabsorbs the excreted urinary glucose. In the pathogenesis of diabetes mellitus, glucose reabsorption by SGLT2 is increased, and SGLT2 inhibitors improve hyperglycaemia by inhibiting this reabsorption. When urinary glucose excretion is enhanced, glucose supply to skeletal muscle may be insufficient and muscle protein catabolism may be accelerated. On the other hand, SGLT2 inhibitors not only ameliorate hyperglycaemia but also improve fatty acid metabolism in muscle, which may prevent muscle atrophy. METHODS Eight-week-old male db/m mice or db/db mice were fed a standard diet with or without the SGLT2i luseogliflozin (0.01% w/w in chow) for 8 weeks. Mice were sacrificed at 16 weeks of age, and skeletal muscle and serum lipidomes, as well as skeletal muscle transcriptome, were analysed. RESULTS Administration of SGLT2i led to not only decreased visceral fat accumulation (P = 0.004) but also increased soleus muscle weight (P = 0.010) and grip strength (P = 0.0001). The levels of saturated fatty acids, especially palmitic acid, decreased in both muscles (P = 0.017) and sera (P = 0.041) upon administration of SGLT2i, while the content of monosaturated fatty acids, especially oleic acid, increased in both muscle (P < 0.0001) and sera (P = 0.009). Finally, the accumulation of transcripts associated with fatty acid metabolism, such as Scd1, Fasn, and Elovl6, and of muscle atrophy-associated transcripts, such as Foxo1, Mstn, Trim63, and Fbxo32, decreased following SGLT2i administration. CONCLUSIONS Intramuscular fatty acid metabolism and gene expression were influenced by the extracellular lipidome, which was modified by SGLT2i. Hence, secondary effects, other than the hypoglycaemic effects of SGLT2i, might lead to the alleviation of sarcopenia.
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Affiliation(s)
- Ryo Bamba
- Department of Endocrinology and Metabolism, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Takuro Okamura
- Department of Endocrinology and Metabolism, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Yoshitaka Hashimoto
- Department of Endocrinology and Metabolism, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Saori Majima
- Department of Endocrinology and Metabolism, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Takafumi Senmaru
- Department of Endocrinology and Metabolism, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Emi Ushigome
- Department of Endocrinology and Metabolism, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Naoko Nakanishi
- Department of Endocrinology and Metabolism, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Mai Asano
- Department of Endocrinology and Metabolism, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Masahiro Yamazaki
- Department of Endocrinology and Metabolism, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hiroshi Takakuwa
- Agilent Technologies, Chromatography Mass Spectrometry Sales Department, Life Science and Applied Markets Group, Tokyo, Japan
| | - Masahide Hamaguchi
- Department of Endocrinology and Metabolism, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Michiaki Fukui
- Department of Endocrinology and Metabolism, Kyoto Prefectural University of Medicine, Kyoto, Japan
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12
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Bilski J, Pierzchalski P, Szczepanik M, Bonior J, Zoladz JA. Multifactorial Mechanism of Sarcopenia and Sarcopenic Obesity. Role of Physical Exercise, Microbiota and Myokines. Cells 2022; 11:cells11010160. [PMID: 35011721 PMCID: PMC8750433 DOI: 10.3390/cells11010160] [Citation(s) in RCA: 57] [Impact Index Per Article: 28.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 12/27/2021] [Accepted: 12/31/2021] [Indexed: 02/07/2023] Open
Abstract
Obesity and ageing place a tremendous strain on the global healthcare system. Age-related sarcopenia is characterized by decreased muscular strength, decreased muscle quantity, quality, and decreased functional performance. Sarcopenic obesity (SO) is a condition that combines sarcopenia and obesity and has a substantial influence on the older adults’ health. Because of the complicated pathophysiology, there are disagreements and challenges in identifying and diagnosing SO. Recently, it has become clear that dysbiosis may play a role in the onset and progression of sarcopenia and SO. Skeletal muscle secretes myokines during contraction, which play an important role in controlling muscle growth, function, and metabolic balance. Myokine dysfunction can cause and aggravate obesity, sarcopenia, and SO. The only ways to prevent and slow the progression of sarcopenia, particularly sarcopenic obesity, are physical activity and correct nutritional support. While exercise cannot completely prevent sarcopenia and age-related loss in muscular function, it can certainly delay development and slow down the rate of sarcopenia. The purpose of this review was to discuss potential pathways to muscle deterioration in obese individuals. We also want to present the current understanding of the role of various factors, including microbiota and myokines, in the process of sarcopenia and SO.
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Affiliation(s)
- Jan Bilski
- Department of Biomechanics and Kinesiology, Chair of Biomedical Sciences, Faculty of Health Sciences, Institute of Physiotherapy, Jagiellonian University Medical College, 31-008 Krakow, Poland
- Correspondence: ; Tel.: +48-12-421-93-51
| | - Piotr Pierzchalski
- Department of Medical Physiology, Chair of Biomedical Sciences, Faculty of Health Sciences, Institute of Physiotherapy, Jagiellonian University Medical College, 31-126 Krakow, Poland; (P.P.); (J.B.)
| | - Marian Szczepanik
- Department of Medical Biology, Chair of Biomedical Sciences, Faculty of Health Sciences, Institute of Physiotherapy, Jagiellonian University Medical College, 31-034 Krakow, Poland;
| | - Joanna Bonior
- Department of Medical Physiology, Chair of Biomedical Sciences, Faculty of Health Sciences, Institute of Physiotherapy, Jagiellonian University Medical College, 31-126 Krakow, Poland; (P.P.); (J.B.)
| | - Jerzy A. Zoladz
- Chair of Exercise Physiology and Muscle Bioenergetics, Faculty of Health Sciences, Jagiellonian University Medical College, 31-066 Krakow, Poland;
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13
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Fujita H, Horie M, Shimizu K, Nagamori E. Microarray profiling of gene expression in C2C12 myotubes trained by electric pulse stimulation. J Biosci Bioeng 2021; 132:417-422. [PMID: 34348874 DOI: 10.1016/j.jbiosc.2021.06.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 06/16/2021] [Accepted: 06/30/2021] [Indexed: 10/20/2022]
Abstract
Electric pulse-stimulated C2C12 myotubes are gaining interest in the field of muscle physiology and biotechnology because electric pulse stimulation (EPS) enhances sarcomere structure development and active tension generation capability. Recently, we found that termination of EPS results in the rapid loss of active tension generation accompanied by disassembly of the sarcomere structure, which may represent an in vitro muscle atrophy model. To elucidate the molecular mechanism underlying this rapid loss of active tension generation and sarcomere structure disassembly after termination of EPS, we performed transcriptomic analysis using microarray. After termination of EPS, 74 genes were upregulated and 120 genes were downregulated after 30 min; however, atrophy-related genes were not found among these genes. To further assess the effect of EPS on gene expression, we re-applied EPS after its termination for 8 h and searched for genes whose expression was reversed. Four genes were upregulated by termination of EPS and downregulated by the re-application of EPS, whereas two genes were downregulated by termination of EPS and upregulated by the re-application of EPS. Although none of these genes were atrophy- or hypertrophy-related, the results presented in this study will contribute to the understanding of gene expression changes that mediate rapid loss of active tension generation and sarcomere structure disassembly following termination of EPS in C2C12 myotubes.
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Affiliation(s)
- Hideaki Fujita
- Department of Stem Cell Biology, Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
| | - Masanobu Horie
- Division of Biochemical Engineering, Radioisotope Research Center, Kyoto University, Yoshida-Konoe-Cho, Sakyo-ku, Kyoto 606-8507, Japan
| | - Kazunori Shimizu
- Department of Biomolecular Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Eiji Nagamori
- Department of Biomedical Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan.
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14
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García-Salazar LF, Ribeiro JAM, Saade-Pacheco CR, Mattiello SM, Catai AM, Garcia-Araújo AS, Russo TL. Adiponectin Concentration and Chronic Stroke Individuals, Associations with Body Composition, Physical Activity Levels and Lipid Profile: A Cross-Sectional Explorative Study. J Stroke Cerebrovasc Dis 2021; 30:105993. [PMID: 34325270 DOI: 10.1016/j.jstrokecerebrovasdis.2021.105993] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 06/25/2021] [Accepted: 07/01/2021] [Indexed: 12/18/2022] Open
Abstract
OBJECTIVE Higher adiponectin concentration has been associated with the presence of sarcopenia in individuals with cardiovascular diseases. Post-stroke individuals presented higher adiponectin concentrations than non-stroke ones. However, no previous study has investigated the association between the adiponectin concentration and skeletal muscle mass in post-stroke individuals. On the other hand, higher adiponectin concentration has been associated with a more favorable lipid profile and the physical activity level might regulate adiponectin concentration. These associations have not been studied in this population. Thus, the main objective of this study was to determine whether the adiponectin concentration is associated with: (1) body composition; (2) lipid profile; and (3) physical activity level in chronic post-stroke individuals. MATERIALS AND METHODS This study was a correlational, cross-sectional exploratory study. Data on body composition and lipid profile were collected using a bioelectrical impedance analyzer (InBody® 720) and an automated method analyzer (CELL-DYN Ruby), respectively. The physical activity level was measured by the StepWatch® Activity Monitor and the serum adiponectin concentration was analyzed using an enzyme-linked immunosorbent assay kit. Correlation analyses were made using Spearman's rank correlation coefficient (rs). RESULTS Twenty-one post-stroke participants took part in the study. The adiponectin concentration was associated with the following: skeletal muscle mass (rs = -0.78), skeletal muscle mass index (rs = -0.75) and high-density lipoprotein (rs = 0.43). CONCLUSIONS A greater adiponectin concentration is associated with a lower skeletal muscle mass and a higher high-density lipoprotein level in chronic post-stroke individuals, but not with physical activity levels.
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Affiliation(s)
- Luisa Fernanda García-Salazar
- Department of Physical Therapy, Federal University of São Carlos, São Carlos, Brazil; Physical Therapy Program, Rehabilitation Science Research Group, School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia
| | | | - Cássia Regina Saade-Pacheco
- Department of Physical Therapy, Federal University of São Carlos, São Carlos, Brazil; Educational Foundation of the Municipality of Assis, Municipal Institute of Higher Education of Assis, Assis, Brazil
| | | | - Aparecida Maria Catai
- Department of Physical Therapy, Federal University of São Carlos, São Carlos, Brazil
| | | | - Thiago Luiz Russo
- Department of Physical Therapy, Federal University of São Carlos, São Carlos, Brazil.
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15
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Muratsu J, Kamide K, Fujimoto T, Takeya Y, Sugimoto K, Taniyama Y, Morishima A, Sakaguchi K, Matsuzawa Y, Rakugi H. The Combination of High Levels of Adiponectin and Insulin Resistance Are Affected by Aging in Non-Obese Old Peoples. Front Endocrinol (Lausanne) 2021; 12:805244. [PMID: 35069451 PMCID: PMC8777034 DOI: 10.3389/fendo.2021.805244] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Accepted: 12/15/2021] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Adipokine dysregulation is a key feature of insulin resistance and a metabolic syndrome associated with obesity. Low adiponectin levels are associated with higher risks of cardiovascular diseases (CVD). However, high adiponectin levels have also been associated with increased all-cause and cardiovascular mortality in the elderly. This adiponectin paradox has yet to be clarified, which has hindered our understanding of the biological role of adiponectin. Adipokine dysregulation and insulin resistance are also associated with energy-deprivation conditions, such as frailty in old age. The objective of this study was to investigate the association between plasma adiponectin and insulin resistance using the homeostasis model assessment for insulin resistance (HOMA-IR) classified by age. In particular, we sought to determine the factors of the subjects associated with both high adiponectin levels and HOMA-IR (H-adiponectin/H-HOMA) and high adiponectin levels and low HOMA-IR (H-adiponectin/L-HOMA). METHODS The eligible subjects in this cross-sectional study were 33,216 individuals who had undergone health checkups at the Physical Checkup Center of Sumitomo Hospital between April 2008 and December 2018. After excluding 26,371 individuals who were under 60 years old, 529 who had been taking medications for diabetes mellitus, and 690 with missing data, the present study included 5,673 (3,467 males, 2,206 females) subjects with no missing data. The relationship between serum adiponectin levels and HOMA-IR was assessed using logistic regression models adjusted by clinically relevant factors. RESULTS In the multivariable logistic regression analysis, age and low BMI were shown to positively correlate with the characteristics of H-adiponectin/H-HOMA. In females, systolic blood pressure was also shown to be an associated factor. CONCLUSION In conclusion, this study showed that aging or a low BMI may contribute to high adiponectin levels and insulin resistance.
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Affiliation(s)
- Jun Muratsu
- Department of Nephrology and Hypertension, Sumitomo Hospital, Osaka, Japan
- Department of Nephrology, Rinku General Medical Center, Izumisano City, Japan
- *Correspondence: Jun Muratsu,
| | - Kei Kamide
- Division of Health Sciences, Osaka University Graduate School of Medicine, Osaka, Japan
- Department of Geriatric and General Medicine, Osaka University Graduate School of Medicine, Suita, Japan
| | - Takashi Fujimoto
- Department of Nephrology and Hypertension, Sumitomo Hospital, Osaka, Japan
| | - Yasushi Takeya
- Division of Health Sciences, Osaka University Graduate School of Medicine, Osaka, Japan
- Department of Geriatric and General Medicine, Osaka University Graduate School of Medicine, Suita, Japan
| | - Ken Sugimoto
- Department of General and Geriatric Medicine, Kawasaki Medical School General Medical Center, Okayama, Japan
| | - Yoshiaki Taniyama
- Department of Geriatric and General Medicine, Osaka University Graduate School of Medicine, Suita, Japan
| | - Atsuyuki Morishima
- Department of Nephrology and Hypertension, Sumitomo Hospital, Osaka, Japan
| | | | - Yuji Matsuzawa
- Department of Nephrology and Hypertension, Sumitomo Hospital, Osaka, Japan
| | - Hiromi Rakugi
- Department of Geriatric and General Medicine, Osaka University Graduate School of Medicine, Suita, Japan
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16
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Priego T, Martín AI, González-Hedström D, Granado M, López-Calderón A. Role of hormones in sarcopenia. VITAMINS AND HORMONES 2021; 115:535-570. [PMID: 33706961 DOI: 10.1016/bs.vh.2020.12.021] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Aging involves numerous changes in body composition that include a decrease in skeletal muscle mass. The gradual reduction in muscle mass is associated with a simultaneous decrease in muscle strength, which leads to reduced mobility, fragility and loss of independence. This process called sarcopenia is secondary to several factors such as sedentary lifestyle, inadequate nutrition, chronic inflammatory state and neurological alterations. However, the endocrine changes associated with aging seem to be of special importance in the development of sarcopenia. On one hand, advancing age is associated with a decreased secretion of the main hormones that stimulate skeletal muscle mass and function (growth hormone, insulin-like growth factor 1 (IGFI), testosterone and estradiol). On the other hand, the alteration of the IGF-I signaling along with decreased insulin sensitivity also have an important impact on myogenesis. Other hormones that decline with aging such as the adrenal-derived dehydroepiandrosterone, thyroid hormones and vitamin D seem to also be involved in sarcopenia. Adipokines released by adipose tissue show important changes during aging and can affect muscle physiology and metabolism. In addition, catabolic hormones such as cortisol and angiotensin II can accelerate aged-induced muscle atrophy, as they are involved in muscle wasting and their levels increase with age. The role played by all of these hormones and the possible use of some of them as therapeutic tools for treating sarcopenia will be discussed.
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Affiliation(s)
- T Priego
- Departamento de Fisiología, Facultad de Medicina, Universidad Complutense de Madrid, Madrid, Spain
| | - A I Martín
- Departamento de Fisiología, Facultad de Medicina, Universidad Complutense de Madrid, Madrid, Spain
| | - D González-Hedström
- Departamento de Fisiología, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain; Pharmactive Biotech Products S.L. Parque Científico de Madrid. Avenida del Doctor Severo Ochoa, 37 Local 4J, 28108 Alcobendas, Madrid, Spain
| | - M Granado
- Departamento de Fisiología, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain; CIBER Fisiopatología de la Obesidad y Nutrición. Instituto de Salud Carlos III, Madrid, Spain
| | - A López-Calderón
- Departamento de Fisiología, Facultad de Medicina, Universidad Complutense de Madrid, Madrid, Spain.
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17
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Pasmans K, Adriaens ME, Olinga P, Langen R, Rensen SS, Schaap FG, Olde Damink SWM, Caiment F, van Loon LJC, Blaak EE, Meex RCR. Hepatic Steatosis Contributes to the Development of Muscle Atrophy via Inter-Organ Crosstalk. Front Endocrinol (Lausanne) 2021; 12:733625. [PMID: 34707570 PMCID: PMC8542925 DOI: 10.3389/fendo.2021.733625] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 08/31/2021] [Indexed: 11/13/2022] Open
Abstract
Individuals with hepatic steatosis often display several metabolic abnormalities including insulin resistance and muscle atrophy. Previously, we found that hepatic steatosis results in an altered hepatokine secretion profile, thereby inducing skeletal muscle insulin resistance via inter-organ crosstalk. In this study, we aimed to investigate whether the altered secretion profile in the state of hepatic steatosis also induces skeletal muscle atrophy via effects on muscle protein turnover. To investigate this, eight-week-old male C57BL/6J mice were fed a chow (4.5% fat) or a high-fat diet (HFD; 45% fat) for 12 weeks to induce hepatic steatosis, after which the livers were excised and cut into ~200-µm slices. Slices were cultured to collect secretion products (conditioned medium; CM). Differentiated L6-GLUT4myc myotubes were incubated with chow or HFD CM to measure glucose uptake. Differentiated C2C12 myotubes were incubated with chow or HFD CM to measure protein synthesis and breakdown, and gene expression via RNA sequencing. Furthermore, proteomics analysis was performed in chow and HFD CM. It was found that HFD CM caused insulin resistance in L6-GLUT4myc myotubes compared with chow CM, as indicated by a blunted insulin-stimulated increase in glucose uptake. Furthermore, protein breakdown was increased in C2C12 cells incubated with HFD CM, while there was no effect on protein synthesis. RNA profiling of C2C12 cells indicated that 197 genes were differentially expressed after incubation with HFD CM, compared with chow CM, and pathway analysis showed that pathways related to anatomical structure and function were enriched. Proteomics analysis of the CM showed that 32 proteins were differentially expressed in HFD CM compared with chow CM. Pathway enrichment analysis indicated that these proteins had important functions with respect to insulin-like growth factor transport and uptake, and affect post-translational processes, including protein folding, protein secretion and protein phosphorylation. In conclusion, the results of this study support the hypothesis that secretion products from the liver contribute to the development of muscle atrophy in individuals with hepatic steatosis.
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Affiliation(s)
- Kenneth Pasmans
- Department of Human Biology, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, Maastricht, Netherlands
| | - Michiel E. Adriaens
- Maastricht Centre for Systems Biology, Maastricht University, Maastricht, Netherlands
| | - Peter Olinga
- Department of Pharmaceutical Technology and Biopharmacy, Groningen Research Institute of Pharmacy, University of Groningen, Groningen, Netherlands
| | - Ramon Langen
- Department of Respiratory Medicine, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, Maastricht, Netherlands
| | - Sander S. Rensen
- Department of Surgery, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, Maastricht, Netherlands
| | - Frank G. Schaap
- Department of Surgery, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, Maastricht, Netherlands
- Department of General, Visceral and Transplantation Surgery, RWTH University Hospital Aachen, Aachen, Germany
| | - Steven W. M. Olde Damink
- Department of Surgery, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, Maastricht, Netherlands
- Department of General, Visceral and Transplantation Surgery, RWTH University Hospital Aachen, Aachen, Germany
| | - Florian Caiment
- Department of Toxicogenomics, School of Oncology and Developmental Biology (GROW), Maastricht University, Maastricht, Netherlands
| | - Luc J. C. van Loon
- Department of Human Biology, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, Maastricht, Netherlands
| | - Ellen E. Blaak
- Department of Human Biology, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, Maastricht, Netherlands
| | - Ruth C. R. Meex
- Department of Human Biology, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, Maastricht, Netherlands
- *Correspondence: Ruth C. R. Meex,
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18
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Mantha OL, Huneau JF, Mathé V, Hermier D, Khodorova N, Mariotti F, Fouillet H. Differential changes to splanchnic and peripheral protein metabolism during the diet-induced development of metabolic syndrome in rats. Am J Physiol Endocrinol Metab 2020; 319:E175-E186. [PMID: 32459526 DOI: 10.1152/ajpendo.00061.2020] [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] [Indexed: 11/22/2022]
Abstract
Little is known about the effects of the development of metabolic syndrome (MS) on protein and amino acid (AA) metabolism. During this study, we took advantage of the variability in interindividual susceptibility to high fat diet-induced MS to study the relationships between MS, protein synthesis, and AA catabolism in multiple tissues in rats. After 4 mo of high-fat feeding, an MS score (ZMS) was calculated as the average of the z-scores for individual MS components [weight, adiposities, homeostasis model for the assessment of insulin resistance (HOMA-IR), and triglycerides]. In the small intestine, liver, plasma, kidneys, heart, and muscles, tissue protein synthesis was measured by 2H2O labeling, and we evaluated the proportion of tissue AA catabolism (relative to protein synthesis) and nutrient routing to nonindispensable AAs in tissue proteins using natural nitrogen and carbon isotopic distances between tissue proteins and nutrients (Δ15N and Δ13C), respectively. In the liver, protein mass and synthesis increased, whereas the proportion of AA catabolism decreased with ZMS. By contrast, in muscles, we found no association between ZMS and protein mass, protein synthesis (except for a weak positive association in the gastrocnemius muscle only), and proportion of AA catabolism. The development of MS was also associated with altered metabolic flexibility and fatty acid oxidation, as shown by less routing of dietary lipids to nonindispensable AA synthesis in liver and muscle. In conclusion, MS development is associated with a greater gain of both fat and protein masses, with higher protein anabolism that mainly occurs in the liver, whereas muscles probably develop anabolic resistance due to insulin resistance.
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Affiliation(s)
- O L Mantha
- Université Paris-Saclay, AgroParisTech, INRAE, UMR PNCA, 75005, Paris, France
| | - J-F Huneau
- Université Paris-Saclay, AgroParisTech, INRAE, UMR PNCA, 75005, Paris, France
| | - V Mathé
- Université Paris-Saclay, AgroParisTech, INRAE, UMR PNCA, 75005, Paris, France
| | - D Hermier
- Université Paris-Saclay, AgroParisTech, INRAE, UMR PNCA, 75005, Paris, France
| | - N Khodorova
- Université Paris-Saclay, AgroParisTech, INRAE, UMR PNCA, 75005, Paris, France
| | - F Mariotti
- Université Paris-Saclay, AgroParisTech, INRAE, UMR PNCA, 75005, Paris, France
| | - H Fouillet
- Université Paris-Saclay, AgroParisTech, INRAE, UMR PNCA, 75005, Paris, France
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19
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Yin J, Qian Z, Chen Y, Li Y, Zhou X. MicroRNA regulatory networks in the pathogenesis of sarcopenia. J Cell Mol Med 2020; 24:4900-4912. [PMID: 32281300 PMCID: PMC7205827 DOI: 10.1111/jcmm.15197] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 02/25/2020] [Accepted: 03/06/2020] [Indexed: 12/11/2022] Open
Abstract
Sarcopenia is an age‐related disease characterized by disturbed homeostasis of skeletal muscle, leading to a decline in muscle mass and function. Loss of muscle mass and strength leads to falls and fracture, and is often accompanied by other geriatric diseases, including osteoporosis, frailty and cachexia, resulting in a general decrease in quality of life and an increase in mortality. Although the underlying mechanisms of sarcopenia are still not completely understood, there has been a marked improvement in the understanding of the pathophysiological changes leading to sarcopenia in recent years. The role of microRNAs (miRNAs), especially, has been clearer in skeletal muscle development and homeostasis. miRNAs form part of a gene regulatory network and have numerous activities in many biological processes. Intervention based on miRNAs may develop into an innovative treatment strategy to conquer sarcopenia. This review is divided into three sections: firstly, the latest understanding of the pathogenesis of sarcopenia is summarized; secondly, increasing evidence for the involvement of miRNAs in the regulation of muscle quantity or quality and muscle homeostasis is highlighted; and thirdly, the possibilities and limitations of miRNAs as a treatment for sarcopenia are explored.
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Affiliation(s)
- Jiayu Yin
- Department of Cardiology, The Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Zhiyuan Qian
- Department of Neurosurgery, The Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Yuqi Chen
- Department of Cardiology, The Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Yi Li
- Department of Cardiology, The Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Xiang Zhou
- Department of Cardiology, The Second Affiliated Hospital of Soochow University, Suzhou, China
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20
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Adipocytes in Breast Cancer, the Thick and the Thin. Cells 2020; 9:cells9030560. [PMID: 32120856 PMCID: PMC7140407 DOI: 10.3390/cells9030560] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 02/21/2020] [Accepted: 02/26/2020] [Indexed: 12/13/2022] Open
Abstract
It is well established that breast cancer development and progression depend not only on tumor-cell intrinsic factors but also on its microenvironment and on the host characteristics. There is growing evidence that adipocytes play a role in breast cancer progression. This is supported by: (i) epidemiological studies reporting the association of obesity with a higher cancer risk and poor prognosis, (ii) recent studies demonstrating the existence of a cross-talk between breast cancer cells and adipocytes locally in the breast that leads to acquisition of an aggressive tumor phenotype, and (iii) evidence showing that cancer cachexia applies also to fat tissue and shares similarities with stromal-carcinoma metabolic synergy. This review summarizes the current knowledge on the epidemiological link between obesity and breast cancer and outlines the results of the tumor-adipocyte crosstalk. We also focus on systemic changes in body fat in patients with cachexia developed in the course of cancer. Moreover, we discuss and compare adipocyte alterations in the three pathological conditions and the mechanisms through which breast cancer progression is induced.
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21
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Wu M, Tang L, Chen B, Zheng J, Dong F, Su Z, Lin F. Blockade of the mTOR signaling pathway with rapamycin ameliorates aristolochic acid nephropathy. Exp Ther Med 2020; 19:2887-2894. [PMID: 32256773 PMCID: PMC7086201 DOI: 10.3892/etm.2020.8550] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Accepted: 12/03/2019] [Indexed: 12/14/2022] Open
Abstract
Chronic aristolochic acid nephropathy (CAAN) is characterized by widespread apoptosis and interstitial fibrosis, which severely impairs kidney function. mTOR is crucial for cell proliferation and protein synthesis. In the present study, the therapeutic effects of blockade of mTOR activity by rapamycin on aristolochic acid nephropathy were investigated. In vitro experiments to determine cell apoptosis and cell cycle alterations caused by aristolochic acid (AA)-induced injury were conducted on three groups of cells: Untreated control, AAI (treated with aristolochic acid I), and AAI + rapamycin (RMS). In vivo experiments were conducted in a CAAN mouse model. One group of mice was treated with AAI (the CAAN group), while another group was treated with AAI and rapamycin (the treatment group). Kidney function and pathological changes in these mice were assessed by serum creatinine and urea nitrogen analysis. Hematoxylin and eosin staining of renal tissue was performed to evaluate the treatment effects of rapamycin. Western blotting and immunohistochemical staining were used to explore the mechanisms by which rapamycin inhibited cell proliferation, apoptosis and tissue fibrosis. In the in vitro experiments, rapamycin prevented AAI-induced cell apoptosis and G2/M checkpoint cell cycle arrest. In the in vivo experiments, the treatment group exhibited lower serum creatinine and urea nitrogen, less extensive tubular atrophy and increased amount of glomerulus. Additionally, western blotting and immunohistochemical staining showed that the treatment group exhibited decreased expression levels of fibrosis-, proliferation- and apoptosis-related proteins compared with the CAAN group. The findings suggest that rapamycin can ameliorate kidney injury induced by AAI via blockade of mTOR, and thus could be a therapeutic strategy for patients with CAAN.
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Affiliation(s)
- Minmin Wu
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
| | - Lili Tang
- Clinical Laboratory, Chinese Medical Hospital of Jining, Jining, Shandong 272037, P.R. China
| | - Bicheng Chen
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
| | - Jianjian Zheng
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
| | - Fengquan Dong
- Department of Nephrology, Shenzhen University General Hospital, Shenzhen, Guangdong 518055, P.R. China
| | - Zhen Su
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
| | - Fan Lin
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China.,Department of Nephrology, Shenzhen University General Hospital, Shenzhen, Guangdong 518055, P.R. China
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22
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Wang B, Wang J, He W, Zhao Y, Zhang A, Liu Y, Hassounah F, Ma F, Klein JD, Wang XH, Wang H. Exogenous miR-29a Attenuates Muscle Atrophy and Kidney Fibrosis in Unilateral Ureteral Obstruction Mice. Hum Gene Ther 2020; 31:367-375. [PMID: 31950871 DOI: 10.1089/hum.2019.287] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Renal fibrosis leads to end-stage renal disease, but antifibrotic drugs are difficult to develop. Chronic kidney disease often results in muscle wasting, and thereby increases morbidity and mortality. In this work, adeno-associated virus (AAV)-mediated overexpressing miR-29a was hypothesized to counteract renal fibrosis and muscle wasting through muscle-kidney crosstalk in unilateral ureteral obstruction (UUO) mice. miR-29a level was downregulated in the kidney and skeletal muscle of UUO mice. The secretion of exosome-encapsulated miR-29a increased in cultured skeletal muscle satellite cells and HEK293 renal cells after stimulation with serum from UUO mice. This result was confirmed by qPCR and microRNA deep sequencing in the serum exosomes of mice with obstructed ureters. A recombinant AAV-miR-29a was generated to overexpress miR-29a and injected into the tibialis anterior muscle of the mice 2 weeks before UUO surgery. AAV-miR-29a abrogated the UUO-induced upregulation of YY1 and myostatin in skeletal muscles. Renal fibrosis was also partially improved in the UUO mice with intramuscular AAV-miR-29a transduction. AAV-miR-29a overexpression reversed the increase in transforming growth factor β, fibronectin, alpha-smooth muscle actin, and collagen 1A1 and 4A1 levels in the kidney of UUO mice. AAV-green fluorescent protein was applied to trace the AAV route in vivo, and fluorescence was significantly visible in the injected/uninjected muscles and in the kidneys. In conclusion, intramuscular AAV-miR-29a injection attenuates muscle wasting and ameliorates renal fibrosis by downregulating several fibrotic-related proteins in UUO mice.
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Affiliation(s)
- Bin Wang
- College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu, P.R. China.,Institute of Nephrology, Zhong Da Hospital, Southeast University, Nanjing, China.,Department of Medicine, Renal Division, Emory University, Atlanta, Georgia
| | - Juan Wang
- Department of Medicine, Renal Division, Emory University, Atlanta, Georgia.,Department of Nephrology, Shanghai General Hosptial, Shanghai Jiaotong University, Shanghai, China
| | - Wei He
- Department of Gastroenterology, Jiangsu Province Geriatric Hospital, Nanjing, China
| | - Yajie Zhao
- Department of Pediatric Nephrology, The Second Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Aiqing Zhang
- Department of Medicine, Renal Division, Emory University, Atlanta, Georgia.,Department of Pediatric Nephrology, The Second Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Yan Liu
- Department of Medicine, Renal Division, Emory University, Atlanta, Georgia.,Division of Nephrology, The 3rd People's Hospital of Datong, Shanxi Medical University, Taiyuan, China
| | - Faten Hassounah
- Department of Medicine, Renal Division, Emory University, Atlanta, Georgia
| | - Fuying Ma
- Department of Medicine, Renal Division, Emory University, Atlanta, Georgia
| | - Janet D Klein
- Department of Medicine, Renal Division, Emory University, Atlanta, Georgia
| | - Xiaonan H Wang
- Department of Medicine, Renal Division, Emory University, Atlanta, Georgia
| | - Haidong Wang
- College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu, P.R. China.,Department of Medicine, Renal Division, Emory University, Atlanta, Georgia
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Can radiomics help to predict skeletal muscle response to chemotherapy in stage IV non-small cell lung cancer? Eur J Cancer 2019; 120:107-113. [PMID: 31514107 DOI: 10.1016/j.ejca.2019.07.023] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 07/24/2019] [Accepted: 07/28/2019] [Indexed: 12/27/2022]
Abstract
BACKGROUND Muscle depletion negatively impacts treatment efficacy and survival rates in cancer. Prevention and timely treatment of muscle loss require prediction of patients at risk. We aimed to investigate the potential of skeletal muscle radiomic features to predict future muscle loss. METHODS A total of 116 patients with stage IV non-small cell lung cancer included in a randomised controlled trial (NCT01171170) studying the effect of nitroglycerin added to paclitaxel-carboplatin-bevacizumab were enrolled. In this post hoc analysis, muscle cross-sectional area and radiomic features were extracted from computed tomography images obtained before initiation of chemotherapy and shortly after administration of the second cycle. For internal cross-validation, the cohort was randomly split in a training set and validation set 100 times. We used least absolute shrinkage and selection operator method to select features that were most significantly associated with muscle loss and an area under the curve (AUC) for model performance. RESULTS Sixty-nine patients (59%) exhibited loss of skeletal muscle. One hundred ninety-three features were used to construct a prediction model for muscle loss. The average AUC was 0.49 (95% confidence interval [CI]: 0.36, 0.62). Differences in intensity and texture radiomic features over time were seen between patients with and without muscle loss. CONCLUSIONS The present study shows that skeletal muscle radiomics did not predict future muscle loss during chemotherapy in non-small cell lung cancer. Differences in radiomic features over time might reflect myosteatosis. Future imaging analysis combined with muscle tissue analysis in patients and in experimental models is needed to unravel the biological processes linked to the radiomic features.
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24
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Li CW, Yu K, Shyh-Chang N, Li GX, Jiang LJ, Yu SL, Xu LY, Liu RJ, Guo ZJ, Xie HY, Li RR, Ying J, Li K, Li DJ. Circulating factors associated with sarcopenia during ageing and after intensive lifestyle intervention. J Cachexia Sarcopenia Muscle 2019; 10:586-600. [PMID: 30969486 PMCID: PMC6596393 DOI: 10.1002/jcsm.12417] [Citation(s) in RCA: 139] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 01/27/2019] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Ageing, chronic diseases, prolonged inactivity, and inadequate nutrition pose a severe threat to skeletal muscle health and function. To date, experimental evidence suggests that ageing-related subclinical inflammation could be an important causative factor in sarcopenia. Although inflammatory signalling has been implicated in the pathogenesis of experimental animal models of sarcopenia, few studies have surveyed the clinical association between circulating factors and muscle mass in patients before and after lifestyle interventions. In this study, we evaluated whether proinflammatory cytokines are associated with the onset of sarcopenia, which circulating factors are associated with the severity of sarcopenia, and how these factors change after lifestyle interventions in sarcopenic elderly persons. METHODS A total of 56 elderly subjects (age ≥ 60 years) with sarcopenia and 56 elderly non-sarcopenic subjects, who met entry criteria and had given informed consent, were selected from the Peking Union Medical College Hospital multicentre prospective longitudinal sarcopenia study for testing relevant circulating factors. Thirty-two elderly subjects from the sarcopenic cohort completed a 12 week intensive lifestyle intervention programme with whey supplements (30 g/day) and a personalized resistance training regimen. The levels of proinflammatory cytokines and metabolic hormones, pre-intensive and post-intensive lifestyle interventions, were measured. RESULTS The sarcopenic group was significantly older (72.05 ± 6.54 years; P < 0.001), more likely to be inactive and female (57.1% of all sarcopenic patients), and had a higher prevalence of type 2 diabetes (16% higher risk). Compared with non-sarcopenic subjects, serum interleukin (IL)-6, IL-18, tumour necrosis factor-α (TNF-α), TNF-like weak inducer of apoptosis (TWEAK), and leptin were significantly higher, while insulin growth factor 1, insulin, and adiponectin were significantly lower in sarcopenic patients (all P < 0.05). Logistic regression analyses revealed that high levels of TNF-α (>11.15 pg/mL) and TWEAK (>1276.48 pg/mL) were associated with a 7.6-fold and 14.3-fold increased risk of sarcopenia, respectively. After adjustment for confounding variables, high levels of TWEAK were still associated with a 13.4-fold increased risk of sarcopenia. Intensive lifestyle interventions led to significant improvements in sarcopenic patients' muscle mass and serum profiles of TWEAK, TNF-α, IL-18, insulin, and adiponectin (all P < 0.05). CONCLUSIONS High levels of the inflammatory cytokines TWEAK and TNF-α are associated with an increased risk of sarcopenia, while the metabolic hormones insulin growth factor 1, insulin, and adiponectin are associated with a decreased risk of sarcopenia in our Chinese patient cohort. Intensive lifestyle interventions could significantly improve muscle mass, reduce inflammation, and restore metabolic hormone levels in sarcopenic patients. This trial was registered at clinicaltrials.gov as NCT02873676.
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Affiliation(s)
- Chun-Wei Li
- Department of Clinical Nutrition and Department of Health Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Dongcheng District, Beijing, China.,Department of General Surgery and Clinical Nutrition, TianJin Union Medical Center, Hongqiao District, Tianjin, China
| | - Kang Yu
- Department of Clinical Nutrition and Department of Health Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Dongcheng District, Beijing, China
| | - Ng Shyh-Chang
- Institute of Stem cell and Regeneration, Chinese Academy of Sciences, Chaoyang District, Beijing, China.,State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Guo-Xun Li
- Department of General Surgery and Clinical Nutrition, TianJin Union Medical Center, Hongqiao District, Tianjin, China
| | - Ling-Juan Jiang
- Department of Central Laboratory, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Dongcheng District, Beijing, China
| | - Song-Lin Yu
- Department of Clinical Laboratory, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Dongcheng District, Beijing, China
| | - Long-Yu Xu
- Department of Sport Physiatry, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Dongcheng District, Beijing, China
| | - Rong-Ji Liu
- Department of Pharmacy, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Dongcheng District, Beijing, China
| | - Zi-Jian Guo
- Department of Clinical Laboratory, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Dongcheng District, Beijing, China
| | - Hai-Yan Xie
- Department of Health Care, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Dongcheng District, Beijing, China
| | - Rong-Rong Li
- Department of Clinical Nutrition and Department of Health Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Dongcheng District, Beijing, China
| | - Jie Ying
- Department of Clinical Nutrition and Department of Health Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Dongcheng District, Beijing, China
| | - Kang Li
- Department of Vascular Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Dongcheng District, Beijing, China
| | - Dong-Jing Li
- Department of Health Care, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Dongcheng District, Beijing, China
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25
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Wang B, Zhang A, Wang H, Klein JD, Tan L, Wang ZM, Du J, Naqvi N, Liu BC, Wang XH. miR-26a Limits Muscle Wasting and Cardiac Fibrosis through Exosome-Mediated microRNA Transfer in Chronic Kidney Disease. Am J Cancer Res 2019; 9:1864-1877. [PMID: 31037144 PMCID: PMC6485283 DOI: 10.7150/thno.29579] [Citation(s) in RCA: 109] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Accepted: 01/19/2019] [Indexed: 12/21/2022] Open
Abstract
Uremic cardiomyopathy and muscle atrophy are associated with insulin resistance and contribute to chronic kidney disease (CKD)-induced morbidity and mortality. We hypothesized that restoration of miR-26a levels would enhance exosome-mediated microRNA transfer to improve muscle wasting and cardiomyopathy that occur in CKD. Methods: Using next generation sequencing and qPCR, we found that CKD mice had a decreased level of miR-26a in heart and skeletal muscle. We engineered an exosome vector that contained Lamp2b, an exosomal membrane protein gene fused with a muscle-specific surface peptide that targets muscle delivery. We transfected this vector into muscle satellite cells and then transduced these cells with adenovirus that expresses miR-26a to produce exosomes encapsulated miR-26a (Exo/miR-26a). Exo/miR-26a was injected once per week for 8 weeks into the tibialis anterior (TA) muscle of 5/6 nephrectomized CKD mice. Results: Treatment with Exo/miR-26a resulted in increased expression of miR-26a in skeletal muscle and heart. Overexpression of miR-26a increased the skeletal muscle cross-sectional area, decreased the upregulation of FBXO32/atrogin-1 and TRIM63/MuRF1 and depressed cardiac fibrosis lesions. In the hearts of CKD mice, FoxO1 was activated, and connective tissue growth factor, fibronectin and collagen type I alpha 1 were increased. These responses were blunted by injection of Exo/miR-26a. Echocardiograms showed that cardiac function was improved in CKD mice treated with Exo/miR-26a. Conclusion: Overexpression of miR-26a in muscle prevented CKD-induced muscle wasting and attenuated cardiomyopathy via exosome-mediated miR-26a transfer. These results suggest possible therapeutic strategies for using exosome delivery of miR-26a to treat complications of CKD.
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26
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Wang H, Wang B, Zhang A, Hassounah F, Seow Y, Wood M, Ma F, Klein JD, Price SR, Wang XH. Exosome-Mediated miR-29 Transfer Reduces Muscle Atrophy and Kidney Fibrosis in Mice. Mol Ther 2019; 27:571-583. [PMID: 30711446 DOI: 10.1016/j.ymthe.2019.01.008] [Citation(s) in RCA: 123] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 01/08/2019] [Accepted: 01/11/2019] [Indexed: 12/14/2022] Open
Abstract
Our previous study showed that miR-29 attenuates muscle wasting in chronic kidney disease. Other studies found that miR-29 has anti-fibrosis activity. We hypothesized that intramuscular injection of exosome-encapsulated miR-29 would counteract unilateral ureteral obstruction (UUO)-induced muscle wasting and renal fibrosis. We used an engineered exosome vector, which contains an exosomal membrane protein gene Lamp2b that was fused with the targeting peptide RVG (rabies viral glycoprotein peptide). RVG directs exosomes to organs that express the acetylcholine receptor, such as kidney. The intervention of Exo/miR29 increased muscle cross-sectional area and decreased UUO-induced upregulation of TRIM63/MuRF1 and FBXO32/atrogin-1. Interestingly, renal fibrosis was partially depressed in the UUO mice with intramuscular injection of Exo/miR29. This was confirmed by decreased TGF-β, alpha-smooth muscle actin, fibronectin, and collagen 1A1 in the kidney of UUO mice. When we used fluorescently labeled Exo/miR29 to trace the Exo/miR route in vivo and found that fluorescence was visible in un-injected muscle and in kidneys. We found that miR-29 directly inhibits YY1 and TGF-β3, which provided a possible mechanism for inhibition of muscle atrophy and renal fibrosis by Exo/miR29. We conclude that Exo/miR29 ameliorates skeletal muscle atrophy and attenuates kidney fibrosis by downregulating YY1 and TGF-β pathway proteins.
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Affiliation(s)
- Haidong Wang
- Department of Medicine, Renal Division, Emory University, Atlanta, GA 30322, USA; College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, China
| | - Bin Wang
- Department of Medicine, Renal Division, Emory University, Atlanta, GA 30322, USA; Institute of Nephrology, Zhong Da Hospital, Southeast University, Nanjing 210009, China
| | - Aiqing Zhang
- Department of Medicine, Renal Division, Emory University, Atlanta, GA 30322, USA; Department of Pediatric Nephrology, the Second Affiliated Hospital of Nanjing Medical University, Nanjing 210003, China
| | - Faten Hassounah
- Department of Medicine, Renal Division, Emory University, Atlanta, GA 30322, USA
| | - Yiqi Seow
- Molecular Engineering Laboratory, Biomedical Medical Sciences Institutes, Singapore, Singapore; Biotechnology and Biological Sciences Research Council, United Kingdom University of Oxford, Oxford, UK
| | - Matthew Wood
- Biotechnology and Biological Sciences Research Council, United Kingdom University of Oxford, Oxford, UK
| | - Fuying Ma
- Department of Medicine, Renal Division, Emory University, Atlanta, GA 30322, USA
| | - Janet D Klein
- Department of Medicine, Renal Division, Emory University, Atlanta, GA 30322, USA
| | - S Russ Price
- Department of Medicine, Renal Division, Emory University, Atlanta, GA 30322, USA; Department of Biochemistry and Molecular Biology, Brody School of Medicine, East Carolina University, Greenville, NC 27834, USA
| | - Xiaonan H Wang
- Department of Medicine, Renal Division, Emory University, Atlanta, GA 30322, USA.
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27
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Hasan MM, Shalaby SM, El-Gendy J, Abdelghany EMA. Beneficial effects of metformin on muscle atrophy induced by obesity in rats. J Cell Biochem 2018; 120:5677-5686. [PMID: 30320911 DOI: 10.1002/jcb.27852] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 09/19/2018] [Indexed: 12/25/2022]
Abstract
AIM A growing interest to understand the signaling pathways mediating obesity-induced muscle atrophy is given. Metformin (Met) was reported to possess positive effects on preventing muscle damage and promoting muscle mass maintenance. The aim of the present study to investigate pathways involved in Met effect on obesity induced muscle atrophy. METHODS Thirty adult male albino rats were assigned into two groups: normal chew diet fed group as control group (C; n = 10) and high-fat-diet (HFD) fed group ( n = 20). After 16 weeks, the HFD-fed animals were subdivided into two groups; HFD group ( n = 10) and HFD fed treated with oral Met (320 mg/day) treatment (Met, n = 10) for 4 weeks. At the end of the experiment; final body weight, visceral fat weight, fasting blood glucose, insulin, lactate, total cholesterol, triglycerides were measured and calculated homeostatic model assessment insulin resistant (HOMA-IR) for all groups. Soleus muscle weight, histopathlogical examination and expression of peroxisome proliferator-activated receptor-γ coactivator-1α (PGC-1α), forkhead box O3 (FoxO3), atrogin-1/MAFbx, and muscle RING finger 1 (MuRF-1) were performed. RESULTS HFD-fed animals showed significant increase in final body weight, visceral fat mass, fasting blood glucose, insulin, calculated HOMA-IR, lactate, total cholesterol and triglycerides with significant decrease in soleus muscle weight, PGC-1α and significant increase in FoxO3, atrogin-1/MAFbx, and MuRF-1 expression. Also, there was significant decrease in fiber diameter, myosin heavy chain (MHC) I content while collagen content and myosin heavy chain IIa were increased compared with control group. Met-treated group showed a significant decrease in the measured parameters compared with the HFD group. It also restored the gene expression, morphometric measures and MHC composition toward normal. CONCLUSION The current study is the first to provide evidence that Met could ameliorate muscle atrophy in high-fat diet induced obesity and this effect may be in part due to regulation of PGC-1α-FoxO3 pathway.
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Affiliation(s)
- Mai M Hasan
- Medical Physiology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Sally M Shalaby
- Medical Biochemistry and Molecular Biology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Jehan El-Gendy
- Medical Pharmacology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Eman M A Abdelghany
- Anatomy and Embryology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
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28
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Zhang A, Li M, Wang B, Klein JD, Price SR, Wang XH. miRNA-23a/27a attenuates muscle atrophy and renal fibrosis through muscle-kidney crosstalk. J Cachexia Sarcopenia Muscle 2018; 9:755-770. [PMID: 29582582 PMCID: PMC6104113 DOI: 10.1002/jcsm.12296] [Citation(s) in RCA: 98] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 01/11/2018] [Accepted: 01/31/2018] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND The treatment of muscle wasting is accompanied by benefits in other organs, possibly resulting from muscle-organ crosstalk. However, how the muscle communicates with these organs is less understood. Two microRNAs (miRs), miR-23a and miR-27a, are located together in a gene cluster and regulate proteins that are involved in the atrophy process. MiR-23a/27a has been shown to reduce muscle wasting and act as an anti-fibrotic agent. We hypothesized that intramuscular injection of miR-23a/27a would counteract both muscle wasting and renal fibrosis lesions in a streptozotocin-induced diabetic model. METHODS We generated an adeno-associated virus (AAV) that overexpresses the miR-23a∼27a∼24-2 precursor RNA and injected it into the tibialis anterior muscle of streptozotocin-induced diabetic mice. Muscle cross-section area (immunohistology plus software measurement) and muscle function (grip strength) were used to evaluate muscle atrophy. Fibrosis-related proteins were measured by western blot to monitor renal damage. In some cases, AAV-GFP was used to mimic the miR movement in vivo, allowing us to track organ redistribution by using the Xtreme Imaging System. RESULTS The injection of AAV-miR-23a/27a increased the levels of miR-23a and miR-27a as well as increased phosphorylated Akt, attenuated the levels of FoxO1 and PTEN proteins, and reduced the abundance of TRIM63/MuRF1 and FBXO32/atrogin-1 in skeletal muscles. It also decreased myostatin mRNA and protein levels as well as the levels of phosphorylated pSMAD2/3. Provision of miR-23a/27a attenuates the diabetes-induced reduction of muscle cross-sectional area and muscle function. Curiously, the serum BUN of diabetic animals was reduced in mice undergoing the miR-23a/27a intervention. Renal fibrosis, evaluated by Masson trichromatic staining, was also decreased as were kidney levels of phosphorylated SMAD2/3, alpha smooth muscle actin, fibronectin, and collagen. In diabetic mice injected intramuscularly with AAV-GFP, GFP fluorescence levels in the kidneys showed linear correlation with the levels in injected muscle when examined by linear regression. Following intramuscular injection of AAV-miR-23a∼27a∼24-2, the levels of miR-23a and miR-27a in serum exosomes and kidney were significantly increased compared with samples from control virus-injected mice; however, no viral DNA was detected in the kidney. CONCLUSIONS We conclude that overexpression of miR-23a/27a in muscle prevents diabetes-induced muscle cachexia and attenuates renal fibrosis lesions via muscle-kidney crosstalk. Further, this crosstalk involves movement of miR potentially through muscle originated exosomes and serum distribution without movement of AAV. These results could provide new approaches for developing therapeutic strategies for diabetic nephropathy with muscle wasting.
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Affiliation(s)
- Aiqing Zhang
- Renal Division, Dept. of MedicineEmory UniversityAtlantaGAUSA
- Department of Pediatric NephrologyThe Second Affiliated Hospital of Nanjing Medical UniversityNanjingChina
| | - Min Li
- Renal Division, Dept. of MedicineEmory UniversityAtlantaGAUSA
- Molecular Biology Laboratory, Guanganmen HospitalChinese Academy of traditional Chinese MedicineBeijingChina
| | - Bin Wang
- Renal Division, Dept. of MedicineEmory UniversityAtlantaGAUSA
- Institute of Nephrology, Zhong Da HospitalSoutheast UniversityNanjingChina
| | - Janet D. Klein
- Renal Division, Dept. of MedicineEmory UniversityAtlantaGAUSA
| | - S. Russ Price
- Renal Division, Dept. of MedicineEmory UniversityAtlantaGAUSA
- Research Service LineAtlanta Veterans Affairs Medical CenterDecaturILUSA
- Department of Biochemistry and Molecular Biology, Brody School of MedicineEast Carolina UniversityGreenvilleNCUSA
| | - Xiaonan H. Wang
- Renal Division, Dept. of MedicineEmory UniversityAtlantaGAUSA
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Eshima H, Tamura Y, Kakehi S, Kurebayashi N, Murayama T, Nakamura K, Kakigi R, Okada T, Sakurai T, Kawamori R, Watada H. Long-term, but not short-term high-fat diet induces fiber composition changes and impaired contractile force in mouse fast-twitch skeletal muscle. Physiol Rep 2017; 5:5/7/e13250. [PMID: 28408640 PMCID: PMC5392533 DOI: 10.14814/phy2.13250] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2017] [Accepted: 03/20/2017] [Indexed: 12/25/2022] Open
Abstract
In this study, we investigated the effects of a short-term and long-term high-fat diet (HFD) on morphological and functional features of fast-twitch skeletal muscle. Male C57BL/6J mice were fed a HFD (60% fat) for 4 weeks (4-week HFD) or 12 weeks (12-week HFD). Subsequently, the fast-twitch extensor digitorum longus muscle was isolated, and the composition of muscle fiber type, expression levels of proteins involved in muscle contraction, and force production on electrical stimulation were analyzed. The 12-week HFD, but not the 4-week HFD, resulted in a decreased muscle tetanic force on 100 Hz stimulation compared with control (5.1 ± 1.4 N/g in the 12-week HFD vs. 7.5 ± 1.7 N/g in the control group; P < 0.05), whereas muscle weight and cross-sectional area were not altered after both HFD protocols. Morphological analysis indicated that the percentage of type IIx myosin heavy chain fibers, mitochondrial oxidative enzyme activity, and intramyocellular lipid levels increased in the 12-week HFD group, but not in the 4-week HFD group, compared with controls (P < 0.05). No changes in the expression levels of calcium handling-related proteins and myofibrillar proteins (myosin heavy chain and actin) were detected in the HFD models, whereas fast-troponin T-protein expression was decreased in the 12-week HFD group, but not in the 4-week HFD group (P < 0.05). These findings indicate that a long-term HFD, but not a short-term HFD, impairs contractile force in fast-twitch muscle fibers. Given that skeletal muscle strength largely depends on muscle fiber type, the impaired muscle contractile force by a HFD might result from morphological changes of fiber type composition.
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Affiliation(s)
- Hiroaki Eshima
- Department of Metabolism & Endocrinology, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Sportology Center, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Yoshifumi Tamura
- Department of Metabolism & Endocrinology, Juntendo University Graduate School of Medicine, Tokyo, Japan .,Sportology Center, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Saori Kakehi
- Department of Metabolism & Endocrinology, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Sportology Center, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Nagomi Kurebayashi
- Department of Cellular and Molecular Pharmacology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Takashi Murayama
- Department of Cellular and Molecular Pharmacology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Kyoko Nakamura
- Department of Physiology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Ryo Kakigi
- Department of Physiology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Takao Okada
- Department of Physiology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Takashi Sakurai
- Department of Cellular and Molecular Pharmacology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Ryuzo Kawamori
- Department of Metabolism & Endocrinology, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Sportology Center, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Hirotaka Watada
- Department of Metabolism & Endocrinology, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Sportology Center, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Center for Therapeutic Innovations in Diabetes, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Center for Molecular Diabetology, Juntendo University Graduate School of Medicine, Tokyo, Japan
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Wang B, Zhang C, Zhang A, Cai H, Price SR, Wang XH. MicroRNA-23a and MicroRNA-27a Mimic Exercise by Ameliorating CKD-Induced Muscle Atrophy. J Am Soc Nephrol 2017; 28:2631-2640. [PMID: 28400445 DOI: 10.1681/asn.2016111213] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Accepted: 03/14/2017] [Indexed: 11/03/2022] Open
Abstract
Muscle atrophy is a frequent complication of CKD, and exercise can attenuate the process. This study investigated the role of microRNA-23a (miR-23a) and miR-27a in the regulation of muscle mass in mice with CKD. These miRs are located in a gene cluster that is regulated by the transcription factor NFAT. CKD mice expressed less miR-23a in muscle than controls, and resistance exercise (muscle overload) increased the levels of miR-23a and miR-27a in CKD mice. Injection of an adeno-associated virus encoding the miR-23a/27a/24-2 precursor RNA into the tibialis anterior muscles of normal and CKD mice led to increases in mature miR-23a and miR-27a but not miR-24-2 in the muscles of both cohorts. Overexpression of miR-23a/miR-27a in CKD mice attenuated muscle loss, improved grip strength, increased the phosphorylation of Akt and FoxO1, and decreased the activation of phosphatase and tensin homolog (PTEN) and FoxO1 and the expression of TRIM63/MuRF1 and FBXO32/atrogin-1 proteins. Provision of miR-23a/miR-27a also reduced myostatin expression and downstream SMAD-2/3 signaling, decreased activation of caspase-3 and -7, and increased the expression of markers of muscle regeneration. Lastly, in silico miR target analysis and luciferase reporter assays in primary satellite cells identified PTEN and caspase-7 as targets of miR-23a and FoxO1 as a target of miR-27a in muscle. These findings provide new insights about the roles of the miR-23a/27a-24-2 cluster in CKD-induced muscle atrophy in mice and suggest a mechanism by which exercise helps to maintain muscle mass.
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Affiliation(s)
- Bin Wang
- Department of Medicine, Renal Division, Emory University, Atlanta, Georgia.,Institute of Nephrology, Zhong Da Hospital, Southeast University, Nanjing, China
| | - Cong Zhang
- Department of Medicine, Renal Division, Emory University, Atlanta, Georgia.,Division of Nephrology, China-Japan Friendship Hospital, Beijing, China
| | - Aiqing Zhang
- Department of Medicine, Renal Division, Emory University, Atlanta, Georgia.,Department of Pediatric Nephrology, The Second Affiliated Hospital of Nanjing Medical University, Nanjing, China; and
| | - Hui Cai
- Department of Medicine, Renal Division, Emory University, Atlanta, Georgia.,Research Service Line, Atlanta Veterans Affairs Medical Center, Decatur, Georgia
| | - S Russ Price
- Department of Medicine, Renal Division, Emory University, Atlanta, Georgia.,Research Service Line, Atlanta Veterans Affairs Medical Center, Decatur, Georgia
| | - Xiaonan H Wang
- Department of Medicine, Renal Division, Emory University, Atlanta, Georgia;
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Bertile F, Fouillen L, Wasselin T, Maes P, Le Maho Y, Van Dorsselaer A, Raclot T. The Safety Limits Of An Extended Fast: Lessons from a Non-Model Organism. Sci Rep 2016; 6:39008. [PMID: 27991520 PMCID: PMC5171797 DOI: 10.1038/srep39008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Accepted: 11/16/2016] [Indexed: 02/03/2023] Open
Abstract
While safety of fasting therapy is debated in humans, extended fasting occurs routinely and safely in wild animals. To do so, food deprived animals like breeding penguins anticipate the critical limit of fasting by resuming feeding. To date, however, no molecular indices of the physiological state that links spontaneous refeeding behaviour with fasting limits had been identified. Blood proteomics and physiological data reveal here that fasting-induced body protein depletion is not unsafe “per se”. Indeed, incubating penguins only abandon their chick/egg to refeed when this state is associated with metabolic defects in glucose homeostasis/fatty acid utilization, insulin production and action, and possible renal dysfunctions. Our data illustrate how the field investigation of “exotic” models can be a unique source of information, with possible biomedical interest.
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Affiliation(s)
- Fabrice Bertile
- CNRS, UMR7178, 67037 Strasbourg, France.,Université de Strasbourg, IPHC, Laboratoire de Spectrométrie de Masse Bio-Organique, 25 rue Becquerel, 67087 Strasbourg, France
| | - Laetitia Fouillen
- CNRS, UMR7178, 67037 Strasbourg, France.,Université de Strasbourg, IPHC, Laboratoire de Spectrométrie de Masse Bio-Organique, 25 rue Becquerel, 67087 Strasbourg, France
| | - Thierry Wasselin
- CNRS, UMR7178, 67037 Strasbourg, France.,Université de Strasbourg, IPHC, Laboratoire de Spectrométrie de Masse Bio-Organique, 25 rue Becquerel, 67087 Strasbourg, France
| | - Pauline Maes
- CNRS, UMR7178, 67037 Strasbourg, France.,Université de Strasbourg, IPHC, Laboratoire de Spectrométrie de Masse Bio-Organique, 25 rue Becquerel, 67087 Strasbourg, France
| | - Yvon Le Maho
- CNRS, UMR7178, 67037 Strasbourg, France.,Université de Strasbourg, IPHC, Département Ecologie, Physiologie et Ethologie, 23 rue Becquerel, 67087 Strasbourg, France
| | - Alain Van Dorsselaer
- CNRS, UMR7178, 67037 Strasbourg, France.,Université de Strasbourg, IPHC, Laboratoire de Spectrométrie de Masse Bio-Organique, 25 rue Becquerel, 67087 Strasbourg, France
| | - Thierry Raclot
- CNRS, UMR7178, 67037 Strasbourg, France.,Université de Strasbourg, IPHC, Département Ecologie, Physiologie et Ethologie, 23 rue Becquerel, 67087 Strasbourg, France
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Fedry J, Blais A, Even PC, Piedcoq J, Fromentin G, Gaudichon C, Azzout-Marniche D, Tomé D. Urinary metabolic profile predicts high-fat diet sensitivity in the C57Bl6/J mouse. J Nutr Biochem 2016; 31:88-97. [PMID: 27133427 DOI: 10.1016/j.jnutbio.2015.12.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 11/20/2015] [Accepted: 12/21/2015] [Indexed: 01/04/2023]
Abstract
To prevent the development of adiposity-associated metabolic diseases, early biomarkers are needed. Such markers could bring insight to understand the complexity of susceptibility to obesity. Urine and plasma metabolomics fingerprints have been successfully associated with metabolic dysfunctions. Fat resistance (FR) was found to be associated with higher urinary levels of acylglycines and leucine. However, no differences were observed before the diet switch. In this context, we aimed at characterizing metabolic signatures predictive of resistance or sensitivity to fat in the C57Bl6/J mouse model. Urinary metabolic profiles of FR (n=15) and fat sensitivity (FS) mice (n=14) were performed on liquid chromatography-mass spectrometry. Urinary and plasma metabolic profiles were first collected at baseline (during low-fat diet), then after 10weeks of high-fat (HF) feeding. Mice were sorted a posteriori into FS and FR based on their final adiposity. After HF feeding for 10weeks, FS mice tended to have lower plasma levels of β-hydroxybutyrate than FR ones. Urinary metabolic profiles showed that baseline levels of octanoylglycine, leucine and valine were significantly lower in FS mice. Moreover, expressions in the adipose tissue of Baat and Glyat mRNA were lower in FS than in FR mice. In muscle, mRNA encoding CaD and UbE2b tended to be lower in FS mice than in FR mice (P=.056 and P=.071, respectively). The data show that lower levels of urinary octanoylglycine, leucine and valine are potential predictive biomarkers of FS and could be related to a lower stimulation in adipose acyl-coenzyme A conjugation to glycine and to muscle protein breakdown.
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Affiliation(s)
- Juliette Fedry
- UMR PNCA Nutrition Physiology and Ingestive Behavior, AgroParisTech, INRA, Université Paris-Saclay, Paris, France
| | - Anne Blais
- UMR PNCA Nutrition Physiology and Ingestive Behavior, AgroParisTech, INRA, Université Paris-Saclay, Paris, France
| | - Patrick C Even
- UMR PNCA Nutrition Physiology and Ingestive Behavior, AgroParisTech, INRA, Université Paris-Saclay, Paris, France
| | - Julien Piedcoq
- UMR PNCA Nutrition Physiology and Ingestive Behavior, AgroParisTech, INRA, Université Paris-Saclay, Paris, France
| | - Gilles Fromentin
- UMR PNCA Nutrition Physiology and Ingestive Behavior, AgroParisTech, INRA, Université Paris-Saclay, Paris, France
| | - Claire Gaudichon
- UMR PNCA Nutrition Physiology and Ingestive Behavior, AgroParisTech, INRA, Université Paris-Saclay, Paris, France
| | - Dalila Azzout-Marniche
- UMR PNCA Nutrition Physiology and Ingestive Behavior, AgroParisTech, INRA, Université Paris-Saclay, Paris, France.
| | - Daniel Tomé
- UMR PNCA Nutrition Physiology and Ingestive Behavior, AgroParisTech, INRA, Université Paris-Saclay, Paris, France
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Grabiec K, Majewska A, Wicik Z, Milewska M, Błaszczyk M, Grzelkowska-Kowalczyk K. The effect of palmitate supplementation on gene expression profile in proliferating myoblasts. Cell Biol Toxicol 2016; 32:185-98. [PMID: 27114085 PMCID: PMC4882353 DOI: 10.1007/s10565-016-9324-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Accepted: 03/28/2016] [Indexed: 12/20/2022]
Abstract
High-fat diet, exposure to saturated fatty acids, or the presence of adipocytes in myoblast microenvironment affects skeletal muscle growth and function. The aim of the present study was to investigate the effect of palmitate supplementation on transcriptomic profile of mouse C2C12 myoblasts. Global gene expression was evaluated using whole mouse genome oligonucleotide microarrays, and the results were validated through qPCR. A total of 4047 genes were identified as differentially expressed, including 3492 downregulated and 555 upregulated genes, during a 48-h exposure to palmitate (0.1 mmol/l). Functional classification showed the involvement of these genes in several processes which regulate cell growth. In conclusion, the addition of palmitate modifies the expression of genes associated with (1) myoblast responsiveness to hormones and growth factors, (2) cytokine and growth factor expression, and (3) regulation of cell-cell and cell-matrix communication. Such alterations can affect myoblast growth and differentiation; however, further studies in this field are required.
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Affiliation(s)
- K Grabiec
- Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), Nowoursynowska 159, 02-776, Warsaw, Poland
| | - A Majewska
- Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), Nowoursynowska 159, 02-776, Warsaw, Poland
| | - Z Wicik
- Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), Nowoursynowska 159, 02-776, Warsaw, Poland
| | - M Milewska
- Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), Nowoursynowska 159, 02-776, Warsaw, Poland
| | - M Błaszczyk
- Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), Nowoursynowska 159, 02-776, Warsaw, Poland
| | - K Grzelkowska-Kowalczyk
- Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), Nowoursynowska 159, 02-776, Warsaw, Poland.
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Su Z, Hu L, Cheng J, Klein JD, Hassounah F, Cai H, Li M, Wang H, Wang XH. Acupuncture plus low-frequency electrical stimulation (Acu-LFES) attenuates denervation-induced muscle atrophy. J Appl Physiol (1985) 2016; 120:426-36. [PMID: 26679610 PMCID: PMC4754622 DOI: 10.1152/japplphysiol.00175.2015] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Accepted: 12/16/2015] [Indexed: 12/20/2022] Open
Abstract
Muscle wasting occurs in a variety of clinical situations, including denervation. There is no effective pharmacological treatment for muscle wasting. In this study, we used a tibial nerve denervation model to test acupuncture plus low-frequency electric stimulation (Acu-LFES) as a therapeutic strategy for muscle atrophy. Acupuncture needles were connected to an SDZ-II electronic acupuncture device delivering pulses at 20 Hz and 1 mA; the treatment was 15 min daily for 2 wk. Acu-LFES prevented soleus and plantaris muscle weight loss and increased muscle cross-sectional area in denervated mice. The abundances of Pax7, MyoD, myogenin, and embryonic myosin heavy chain were significantly increased by Acu-LFES in both normal and denervated muscle. The number of central nuclei was increased in Acu-LFES-treated muscle fibers. Phosphorylation of Akt was downregulated by denervation leading to a decline in muscle mass; however, Acu-LFES prevented the denervation-induced decline largely by upregulation of the IGF-1 signaling pathway. Acu-LFES reduced the abundance of muscle catabolic proteins forkhead O transcription factor and myostatin, contributing to the attenuated muscle atrophy. Acu-LFES stimulated the expression of macrophage markers (F4/80, IL-1b, and arginase-1) and inflammatory cytokines (IL-6, IFNγ, and TNFα) in normal and denervated muscle. Acu-LFES also stimulated production of the muscle-specific microRNAs miR-1 and miR-206. We conclude that Acu-LFES is effective in counteracting denervation-induced skeletal muscle atrophy and increasing muscle regeneration. Upregulation of IGF-1, downregulation of myostatin, and alteration of microRNAs contribute to the attenuation of muscle atrophy in denervated mice.
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Affiliation(s)
- Zhen Su
- Department of Nephrology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China; Renal Division, Department of Medicine, Emory University, Atlanta, Georgia
| | - Li Hu
- Acumox and Tuina Research Section, College of Acumox and Tuina, Shanghai University of Traditional Chinese Medicine, Shanghai, China; Renal Division, Department of Medicine, Emory University, Atlanta, Georgia
| | - Jinzhong Cheng
- Nephrology, Department of Medicine, Baylor College of Medicine, Houston, Texas; and
| | - Janet D Klein
- Renal Division, Department of Medicine, Emory University, Atlanta, Georgia
| | - Faten Hassounah
- Renal Division, Department of Medicine, Emory University, Atlanta, Georgia
| | - Hui Cai
- Renal Division, Department of Medicine, Emory University, Atlanta, Georgia
| | - Min Li
- Renal Division, Department of Medicine, Emory University, Atlanta, Georgia
| | - Haidong Wang
- Renal Division, Department of Medicine, Emory University, Atlanta, Georgia
| | - Xiaonan H Wang
- Renal Division, Department of Medicine, Emory University, Atlanta, Georgia
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36
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Roseno SL, Davis PR, Bollinger LM, Powell JJS, Witczak CA, Brault JJ. Short-term, high-fat diet accelerates disuse atrophy and protein degradation in a muscle-specific manner in mice. Nutr Metab (Lond) 2015; 12:39. [PMID: 26539241 PMCID: PMC4632408 DOI: 10.1186/s12986-015-0037-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Accepted: 10/25/2015] [Indexed: 01/06/2023] Open
Abstract
BACKGROUND A short-term high-fat diet impairs mitochondrial function and the ability of skeletal muscle to respond to growth stimuli, but it is unknown whether such a diet alters the ability to respond to atrophy signals. The purpose of this study was to determine whether rapid weigh gain induced by a high-fat (HF) diet accelerates denervation-induced muscle atrophy. METHODS Adult, male mice (C57BL/6) were fed a control or HF (60 % calories as fat) diet for 3 weeks (3wHF). Sciatic nerve was sectioned unilaterally for the final 5 or 14 days of the diet. Soleus and extensor digitorum longus (EDL) muscles were removed and incubated in vitro to determine rates of protein degradation and subsequently homogenized for determination of protein levels of LC3, ubiquitination, myosin heavy chain (MHC) distribution, and mitochondrial subunits. RESULTS When mice were fed the 3wHF diet, whole-body fat mass more than doubled, but basal (innervated) muscle weights, rates of protein degradation, LC3 content, mitochondrial protein content, and myosin isoform distribution were not significantly different than with the control diet in either soleus or EDL. However in the 14 day denervated soleus, the 3wHF diet significantly augmented loss of mass, proteolysis rate, amount of the autophagosome marker LC3 II, and the amount of overall ubiquitination as compared to the control fed mice. On the contrary, the 3wHF diet had no significant effect in the EDL on amount of mass loss, proteolysis rate, LC3 levels, or ubiquitination. Fourteen days denervation also induced a loss of mitochondrial proteins in the soleus but not the EDL, regardless of the diet. CONCLUSIONS Taken together, a short-term, high-fat diet augments denervation muscle atrophy by induction of protein degradation in the mitochondria-rich soleus but not in the glycolytic EDL. These findings suggest that the denervation-induced loss of mitochondria and HF diet-induced impairment of mitochondrial function may combine to promote skeletal muscle atrophy.
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Affiliation(s)
- Steven L Roseno
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC USA ; Human Performance Lab, Department of Kinesiology, College of Health and Human Performance, East Carolina University, Greenville, NC USA
| | - Patrick R Davis
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC USA ; Human Performance Lab, Department of Kinesiology, College of Health and Human Performance, East Carolina University, Greenville, NC USA
| | - Lance M Bollinger
- Department of Kinesiology and Health Promotion, College of Education, University of Kentucky, Lexington, KY USA
| | - Jonathan J S Powell
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC USA ; Human Performance Lab, Department of Kinesiology, College of Health and Human Performance, East Carolina University, Greenville, NC USA
| | - Carol A Witczak
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC USA ; Human Performance Lab, Department of Kinesiology, College of Health and Human Performance, East Carolina University, Greenville, NC USA ; Department of Physiology, Brody School of Medicine, East Carolina University, Greenville, 27834 NC USA ; Department of Biochemistry and Molecular Biology, Brody School of Medicine, East Carolina University, Greenville, NC USA
| | - Jeffrey J Brault
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC USA ; Human Performance Lab, Department of Kinesiology, College of Health and Human Performance, East Carolina University, Greenville, NC USA ; Department of Physiology, Brody School of Medicine, East Carolina University, Greenville, 27834 NC USA ; Department of Biochemistry and Molecular Biology, Brody School of Medicine, East Carolina University, Greenville, NC USA
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Abou-Samra M, Lecompte S, Schakman O, Noel L, Many MC, Gailly P, Brichard SM. Involvement of adiponectin in the pathogenesis of dystrophinopathy. Skelet Muscle 2015; 5:25. [PMID: 26257862 PMCID: PMC4528853 DOI: 10.1186/s13395-015-0051-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Accepted: 07/22/2015] [Indexed: 12/23/2022] Open
Abstract
Background The hormone adiponectin (ApN) is decreased in the metabolic syndrome, where it plays a key pathogenic role. ApN also exerts some anti-inflammatory effects on skeletal muscles in mice exposed to acute or chronic inflammation. Here, we investigate whether ApN could be sufficiently potent to counteract a severe degenerative muscle disease, with an inflammatory component such as Duchenne muscular dystrophy (DMD). Methods Mdx mice (a DMD model caused by dystrophin mutation) were crossed with mice overexpressing ApN in order to generate mdx-ApN mice; only littermates were used. Different markers of inflammation/oxidative stress and components of signaling pathways were studied. Global force was assessed by in vivo functional tests, and muscle injury with Evans Blue Dye (EBD). Eventually, primary cultures of human myotubes were used. Results Circulating ApN was markedly diminished in mdx mice. Replenishment of ApN strikingly reduced muscle inflammation, oxidative stress, and enhanced the expression of myogenic differentiation markers along with that of utrophin A (a dystrophin analog) in mdx-ApN mice. Accordingly, mdx-ApN mice exhibited higher global force and endurance as well as decreased muscle damage as quantified by curtailed extravasation of EBD in myofibers. These beneficial effects of ApN were recapitulated in human myotubes. ApN mediates its protection via the adiponectin receptor 1 (AdipoR1, the main ApN receptor in muscle) and the AMPK-SIRT1-PGC-1α signaling pathway, leading to downregulation of the nuclear factor kappa B (NF-κB) and inflammatory genes, together with upregulation of utrophin. Conclusions Adiponectin proves to be an extremely powerful hormone capable of protecting the skeletal muscle against inflammation and injury, thereby offering novel therapeutic perspectives for dystrophinopathies. Electronic supplementary material The online version of this article (doi:10.1186/s13395-015-0051-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Michel Abou-Samra
- Endocrinology, Diabetes and Nutrition Unit, Institute of Experimental and Clinical Research, Medical Sector, Catholic University of Louvain, 1200 Brussels, Belgium
| | - Sophie Lecompte
- Endocrinology, Diabetes and Nutrition Unit, Institute of Experimental and Clinical Research, Medical Sector, Catholic University of Louvain, 1200 Brussels, Belgium
| | - Olivier Schakman
- Cellular and Molecular Unit, Institute of Neuroscience, Medical Sector, Catholic University of Louvain, 1200 Brussels, Belgium
| | - Laurence Noel
- Endocrinology, Diabetes and Nutrition Unit, Institute of Experimental and Clinical Research, Medical Sector, Catholic University of Louvain, 1200 Brussels, Belgium
| | - Marie C Many
- Experimental Morphology Unit, Institute of Experimental and Clinical Research, Medical Sector, Catholic University of Louvain, 1200 Brussels, Belgium
| | - Philippe Gailly
- Cellular and Molecular Unit, Institute of Neuroscience, Medical Sector, Catholic University of Louvain, 1200 Brussels, Belgium
| | - Sonia M Brichard
- Endocrinology, Diabetes and Nutrition Unit, Institute of Experimental and Clinical Research, Medical Sector, Catholic University of Louvain, 1200 Brussels, Belgium
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38
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Su Z, Robinson A, Hu L, Klein JD, Hassounah F, Li M, Wang H, Cai H, Wang XH. Acupuncture plus Low-Frequency Electrical Stimulation (Acu-LFES) Attenuates Diabetic Myopathy by Enhancing Muscle Regeneration. PLoS One 2015; 10:e0134511. [PMID: 26230945 PMCID: PMC4521913 DOI: 10.1371/journal.pone.0134511] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2015] [Accepted: 07/09/2015] [Indexed: 12/20/2022] Open
Abstract
Mortality and morbidity are increased in patients with muscle atrophy resulting from catabolic diseases such as diabetes. At present there is no pharmacological treatment that successfully reverses muscle wasting from catabolic conditions. We hypothesized that acupuncture plus low frequency electric stimulation (Acu-LFES) would mimic the impact of exercise and prevent diabetes-induced muscle loss. Streptozotocin (STZ) was used to induce diabetes in mice. The mice were then treated with Acu-LFES for 15 minutes daily for 14 days. Acupuncture points were selected according to the WHO Standard Acupuncture Nomenclature guide. The needles were connected to an SDZ-II electronic acupuncture device delivering pulses at 20Hz and 1mA. Acu-LFES prevented soleus and EDL muscle weight loss and increased hind-limb muscle grip function in diabetic mice. Muscle regeneration capacity was significantly increased by Acu-LFES. The expression of Pax7, MyoD, myogenin and embryo myosin heavy chain (eMyHC) was significantly decreased in diabetic muscle vs. control muscle. The suppressed levels in diabetic muscle were reversed by Acu-LFES. The IGF-1 signaling pathway was also upregulated by Acu-LFES. Phosphorylation of Akt, mTOR and p70S6K were downregulated by diabetes leading to a decline in muscle mass, however, Acu-LFES countered the diabetes-induced decline. In addition, microRNA-1 and -206 were increased by Acu-LFES after 24 days of treatment. We conclude that Acu-LFES is effective in counteracting diabetes-induced skeletal muscle atrophy by increasing IGF-1 and its stimulation of muscle regeneration.
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Affiliation(s)
- Zhen Su
- Department of Nephrology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
- Renal Division, Department of Medicine, Emory University, Atlanta, GA, United States of America
| | - Alayna Robinson
- Renal Division, Department of Medicine, Emory University, Atlanta, GA, United States of America
| | - Li Hu
- Acumox and Tuina Research Section, College of Acumox and Tuina, Shanghai University of Traditional Chinese Medicine, Shanghai, China
- Renal Division, Department of Medicine, Emory University, Atlanta, GA, United States of America
| | - Janet D. Klein
- Renal Division, Department of Medicine, Emory University, Atlanta, GA, United States of America
| | - Faten Hassounah
- Renal Division, Department of Medicine, Emory University, Atlanta, GA, United States of America
| | - Min Li
- Renal Division, Department of Medicine, Emory University, Atlanta, GA, United States of America
| | - Haidong Wang
- Renal Division, Department of Medicine, Emory University, Atlanta, GA, United States of America
| | - Hui Cai
- Renal Division, Department of Medicine, Emory University, Atlanta, GA, United States of America
| | - Xiaonan H. Wang
- Renal Division, Department of Medicine, Emory University, Atlanta, GA, United States of America
- * E-mail:
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Budui SL, Rossi AP, Zamboni M. The pathogenetic bases of sarcopenia. CLINICAL CASES IN MINERAL AND BONE METABOLISM 2015; 12:22-6. [PMID: 26136791 DOI: 10.11138/ccmbm/2015.12.1.022] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Aging is accompanied by involuntary loss of skeletal muscle mass, strength and function, called sarcopenia. The mechanisms underlying the development of sarcopenia are not completely understood and most likely multi-factorial, but significant progress has been made over the past few years to identify some of the major contributors. Besides life style-related factors, as diet and physical activity, sarcopenia seems to be also determined by hormonal dysregulation, chronic inflammatory status, ectopic adipose tissue accumulation, neurological and vascular changes associated with aging. The present mini-review focused on the basic factors that primarily impact muscle homeostasis in older subjects. A better understanding of cellular mechanism leading to sarcopenia is required to establish evidence-based intervention in order to prevent onset of symptoms associated with sarcopenia and to extend the time free from disability in older adults.
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Affiliation(s)
- Simona L Budui
- Geriatric Section, Department of Medicine, University of Verona, Verona, Italy
| | - Andrea P Rossi
- Geriatric Section, Department of Medicine, University of Verona, Verona, Italy
| | - Mauro Zamboni
- Geriatric Section, Department of Medicine, University of Verona, Verona, Italy
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Migliaccio S, Greco EA, Wannenes F, Donini LM, Lenzi A. Adipose, bone and muscle tissues as new endocrine organs: role of reciprocal regulation for osteoporosis and obesity development. Horm Mol Biol Clin Investig 2015; 17:39-51. [PMID: 25372729 DOI: 10.1515/hmbci-2013-0070] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2013] [Accepted: 02/14/2014] [Indexed: 02/07/2023]
Abstract
The belief that obesity is protective against osteoporosis has recently been revised. In fact, the latest epidemiologic and clinical studies show that a high level of fat mass, but also reduced muscle mass, might be a risk factor for osteoporosis and fragility fractures. Furthermore, increasing evidence seems to indicate that different components such as myokines, adipokines and growth factors, released by both fat and muscle tissues, could play a key role in the regulation of skeletal health and in low bone mineral density and, thus, in osteoporosis development. This review considers old and recent data in the literature to further evaluate the relationship between fat, bone and muscle tissue.
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Grabiec K, Milewska M, Błaszczyk M, Gajewska M, Grzelkowska-Kowalczyk K. Palmitate exerts opposite effects on proliferation and differentiation of skeletal myoblasts. Cell Biol Int 2015; 39:1044-52. [PMID: 25857830 DOI: 10.1002/cbin.10477] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Accepted: 03/31/2015] [Indexed: 12/27/2022]
Abstract
The purpose of the study was to examine mechanisms controlling cell cycle progression/arrest and differentiation of mouse C2C12 myoblasts exposed to long-chain saturated fatty acid salt, palmitate. Treatment of proliferating myoblasts with palmitate (0.1 mmol/l) markedly decreased myoblast number. Cyclin A and cyclin D1 levels decreased, whereas total p21 and p21 complexed with cyclin-dependent kinase-4 (cdk4) increased in myoblasts treated with palmitate. In cells induced to differentiation addition of palmitate augmented the level of cyclin D3, the early (myogenin) and late (α-actinin, myosin heavy chain) markers of myogenesis, and caused an increase of myotube diameter. In conclusion, exposure to palmitate inhibits proliferation of myoblasts through a decrease in cyclin A and cyclin D1 levels and an increase of p21-cdk4 complex formation; however, it promotes cell cycle exit, myogenic differentiation and myotube growth.
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Affiliation(s)
- Kamil Grabiec
- Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), Nowoursynowska 159, 02-776, Warsaw, Poland
| | - Marta Milewska
- Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), Nowoursynowska 159, 02-776, Warsaw, Poland
| | - Maciej Błaszczyk
- Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), Nowoursynowska 159, 02-776, Warsaw, Poland
| | - Małgorzata Gajewska
- Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), Nowoursynowska 159, 02-776, Warsaw, Poland
| | - Katarzyna Grzelkowska-Kowalczyk
- Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), Nowoursynowska 159, 02-776, Warsaw, Poland
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Nardi F, Hoffmann TM, Stretton C, Cwiklinski E, Taylor PM, Hundal HS. Proteasomal modulation of cellular SNAT2 (SLC38A2) abundance and function by unsaturated fatty acid availability. J Biol Chem 2015; 290:8173-84. [PMID: 25653282 PMCID: PMC4375474 DOI: 10.1074/jbc.m114.625137] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Expression and activity of the System A/SNAT2 (SLC38A2) amino acid transporter is up-regulated by amino acid starvation and hypertonicity by a mechanism dependent on both ATF4-mediated transcription of the SLC38A2 gene and enhanced stabilization of SNAT2 itself, which forms part of an integrated cellular stress response to nutrient deprivation and osmotic stress. Here we demonstrate that this adaptive increase in System A function is restrained in cells subjected to prior incubation with linoleic acid (LOA, an unsaturated C18:2 fatty acid) for 24 h. While fatty acid treatment had no detectable effect upon stress-induced SNAT2 or ATF4 gene transcription, the associated increase in SNAT2 protein/membrane transport activity were strongly suppressed in L6 myotubes or HeLa cells preincubated with LOA. Cellular ubiquitination of many proteins was increased by LOA and although the fatty acid-induced loss of SNAT2 could be attenuated by proteasomal inhibition, the functional increase in System A transport activity associated with amino acid starvation/hypertonicity that depends upon processing/maturation and delivery of SNAT2 to the cell surface could not be rescued. LOA up-regulated cellular expression of Nedd4.2, an E3-ligase implicated in SNAT2 ubiquitination, but shRNA-directed Nedd4.2 gene silencing could not curb fatty acid-induced loss of SNAT2 adaptation. However, expression of SNAT2 in which seven putative lysyl-ubiquitination sites in the cytoplasmic N-terminal domain were mutated to alanine protected SNAT2 against LOA-induced proteasomal degradation. Collectively, our findings indicate that increased availability of unsaturated fatty acids can compromise the stress-induced induction/adaptation in SNAT2 expression and function by promoting its degradation via the ubiquitin-proteasome system.
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Affiliation(s)
- Francesca Nardi
- From the Division of Cell Signalling and Immunology, Sir James Black Centre, College of Life Sciences, University of Dundee, Dundee, DD1 5EH, United Kingdom
| | - Thorsten M Hoffmann
- From the Division of Cell Signalling and Immunology, Sir James Black Centre, College of Life Sciences, University of Dundee, Dundee, DD1 5EH, United Kingdom
| | - Clare Stretton
- From the Division of Cell Signalling and Immunology, Sir James Black Centre, College of Life Sciences, University of Dundee, Dundee, DD1 5EH, United Kingdom
| | - Emma Cwiklinski
- From the Division of Cell Signalling and Immunology, Sir James Black Centre, College of Life Sciences, University of Dundee, Dundee, DD1 5EH, United Kingdom
| | - Peter M Taylor
- From the Division of Cell Signalling and Immunology, Sir James Black Centre, College of Life Sciences, University of Dundee, Dundee, DD1 5EH, United Kingdom
| | - Harinder S Hundal
- From the Division of Cell Signalling and Immunology, Sir James Black Centre, College of Life Sciences, University of Dundee, Dundee, DD1 5EH, United Kingdom
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Sáinz N, Barrenetxe J, Moreno-Aliaga MJ, Martínez JA. Leptin resistance and diet-induced obesity: central and peripheral actions of leptin. Metabolism 2015; 64:35-46. [PMID: 25497342 DOI: 10.1016/j.metabol.2014.10.015] [Citation(s) in RCA: 290] [Impact Index Per Article: 32.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Revised: 10/15/2014] [Accepted: 10/20/2014] [Indexed: 12/15/2022]
Abstract
Obesity is a chronic disease that represents one of the most serious global health burdens associated to an excess of body fat resulting from an imbalance between energy intake and expenditure, which is regulated by environmental and genetic interactions. The adipose-derived hormone leptin acts via a specific receptor in the brain to regulate energy balance and body weight, although this protein can also elicit a myriad of actions in peripheral tissues. Obese individuals, rather than be leptin deficient, have in most cases, high levels of circulating leptin. The failure of these high levels to control body weight suggests the presence of a resistance process to the hormone that could be partly responsible of disturbances on body weight regulation. Furthermore, leptin resistance can impair physiological peripheral functions of leptin such as lipid and carbohydrate metabolism and nutrient intestinal utilization. The present document summarizes those findings regarding leptin resistance development and the role of this hormone in the development and maintenance of an obese state. Thus, we focused on the effect of the impaired leptin action on adipose tissue, liver, skeletal muscle and intestinal function and the accompanying relationships with diet-induced obesity. The involvement of some inflammatory mediators implicated in the development of obesity and their roles in leptin resistance development are also discussed.
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Affiliation(s)
- Neira Sáinz
- Department of Nutrition, Food Sciences and Physiology, University of Navarra, C/Irunlarrea 1, 31008 Pamplona, Spain
| | - Jaione Barrenetxe
- Department of Nutrition, Food Sciences and Physiology, University of Navarra, C/Irunlarrea 1, 31008 Pamplona, Spain
| | - María J Moreno-Aliaga
- Department of Nutrition, Food Sciences and Physiology, University of Navarra, C/Irunlarrea 1, 31008 Pamplona, Spain; CIBER Fisiopatología de la Obesidad y la Nutrición (CIBERobn), Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - José Alfredo Martínez
- Department of Nutrition, Food Sciences and Physiology, University of Navarra, C/Irunlarrea 1, 31008 Pamplona, Spain; CIBER Fisiopatología de la Obesidad y la Nutrición (CIBERobn), Instituto de Salud Carlos III, 28029 Madrid, Spain.
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Ageing, adipose tissue, fatty acids and inflammation. Biogerontology 2014; 16:235-48. [PMID: 25367746 DOI: 10.1007/s10522-014-9536-x] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 10/20/2014] [Indexed: 12/22/2022]
Abstract
A common feature of ageing is the alteration in tissue distribution and composition, with a shift in fat away from lower body and subcutaneous depots to visceral and ectopic sites. Redistribution of adipose tissue towards an ectopic site can have dramatic effects on metabolic function. In skeletal muscle, increased ectopic adiposity is linked to insulin resistance through lipid mediators such as ceramide or DAG, inhibiting the insulin receptor signalling pathway. Additionally, the risk of developing cardiovascular disease is increased with elevated visceral adipose distribution. In ageing, adipose tissue becomes dysfunctional, with the pathway of differentiation of preadipocytes to mature adipocytes becoming impaired; this results in dysfunctional adipocytes less able to store fat and subsequent fat redistribution to ectopic sites. Low grade systemic inflammation is commonly observed in ageing, and may drive the adipose tissue dysfunction, as proinflammatory cytokines are capable of inhibiting adipocyte differentiation. Beyond increased ectopic adiposity, the effect of impaired adipose tissue function is an elevation in systemic free fatty acids (FFA), a common feature of many metabolic disorders. Saturated fatty acids can be regarded as the most detrimental of FFA, being capable of inducing insulin resistance and inflammation through lipid mediators such as ceramide, which can increase risk of developing atherosclerosis. Elevated FFA, in particular saturated fatty acids, maybe a driving factor for both the increased insulin resistance, cardiovascular disease risk and inflammation in older adults.
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Hu L, Klein JD, Hassounah F, Cai H, Zhang C, Xu P, Wang XH. Low-frequency electrical stimulation attenuates muscle atrophy in CKD--a potential treatment strategy. J Am Soc Nephrol 2014; 26:626-35. [PMID: 25228359 DOI: 10.1681/asn.2014020144] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Effective therapeutic strategies to treat CKD-induced muscle atrophy are urgently needed. Low-frequency electrical stimulation (LFES) may be effective in preventing muscle atrophy, because LFES is an acupuncture technique that mimics resistance exercise by inducing muscle contraction. To test this hypothesis, we treated 5/6-nephrectomized mice (CKD mice) and control mice with LFES for 15 days. LFES prevented soleus and extensor digitorum longus muscle weight loss and loss of hind-limb muscle grip in CKD mice. LFES countered the CKD-induced decline in the IGF-1 signaling pathway and led to increases in markers of protein synthesis and myogenesis and improvement in muscle protein metabolism. In control mice, we observed an acute response phase immediately after LFES, during which the expression of inflammatory cytokines (IFN-γ and IL-6) increased. Expression of the M1 macrophage marker IL-1β also increased acutely, but expression of the M2 marker arginase-1 increased 2 days after initiation of LFES, paralleling the change in IGF-1. In muscle cross-sections of LFES-treated mice, arginase-1 colocalized with IGF-1. Additionally, expression of microRNA-1 and -206, which inhibits IGF-1 translation, decreased in the acute response phase after LFES and increased at a later phase. We conclude that LFES ameliorates CKD-induced skeletal muscle atrophy by upregulation of the IGF-1 signaling pathway, which improves protein metabolism and promotes myogenesis. The upregulation of IGF-1 may be mediated by decreased expression of microRNA-1 and -206 and/or activation of M2 macrophages.
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Affiliation(s)
- Li Hu
- Renal Division, Department of Medicine, Emory University, Atlanta, Georgia; Acumox and Tuina Research Section, College of Acumox and Tuina, Shanghai University of Traditional Chinese Medicine, Shanghai, China; and
| | - Janet D Klein
- Renal Division, Department of Medicine, Emory University, Atlanta, Georgia
| | - Faten Hassounah
- Renal Division, Department of Medicine, Emory University, Atlanta, Georgia
| | - Hui Cai
- Renal Division, Department of Medicine, Emory University, Atlanta, Georgia; Section of Nephrology, Atlanta Veterans Administration Medical Center, Decatur, Georgia
| | - Cong Zhang
- Renal Division, Department of Medicine, Emory University, Atlanta, Georgia
| | - Ping Xu
- Acumox and Tuina Research Section, College of Acumox and Tuina, Shanghai University of Traditional Chinese Medicine, Shanghai, China; and
| | - Xiaonan H Wang
- Renal Division, Department of Medicine, Emory University, Atlanta, Georgia;
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Abstract
In patients with chronic kidney disease (CKD), loss of cellular proteins increases the risks of morbidity and mortality. Persistence of muscle protein catabolism in CKD results in striking losses of muscle proteins as whole-body protein turnover is great; even small but persistent imbalances between protein synthesis and degradation cause substantial protein loss. No reliable methods to prevent CKD-induced muscle wasting currently exist, but mechanisms that control cellular protein turnover have been identified, suggesting that therapeutic strategies will be developed to suppress or block protein loss. Catabolic pathways that cause protein wasting include activation of the ubiquitin-proteasome system (UPS), caspase-3, lysosomes and myostatin (a negative regulator of skeletal muscle growth). These pathways can be initiated by complications associated with CKD, such as metabolic acidosis, defective insulin signalling, inflammation, increased angiotensin II levels, abnormal appetite regulation and impaired microRNA responses. Inflammation stimulates cellular signalling pathways that activate myostatin, which accelerates UPS-mediated catabolism. Blocking this pathway can prevent loss of muscle proteins. Myostatin inhibition could yield new therapeutic directions for blocking muscle protein wasting in CKD or disorders associated with its complications.
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Affiliation(s)
- Xiaonan H Wang
- Renal Division, Department of Medicine, Emory University, 1639 Pierce Drive, WMB 338, Atlanta, GA 30322, USA
| | - William E Mitch
- Nephrology Division, Department of Medicine, Baylor College of Medicine, One Baylor Plaza, ABBR R705, Houston, TX 77030, USA
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Abstract
The concept of skeletal muscle myopathy as a main determinant of exercise intolerance in chronic heart failure (HF) is gaining acceptance. Symptoms that typify HF patients, including shortness of breath and fatigue, are often directly related to the abnormalities of the skeletal muscle in HF. Besides muscular wasting, alterations in skeletal muscle energy metabolism, including insulin resistance, have been implicated in HF. Adiponectin, an adipocytokine with insulin-sensitizing properties, receives increasing interest in HF. Circulating adiponectin levels are elevated in HF patients, but high levels are paradoxically associated with poor outcome. Previous analysis of m. vastus lateralis biopsies in HF patients highlighted a striking functional adiponectin resistance. Together with increased circulating adiponectin levels, adiponectin expression within the skeletal muscle is elevated in HF patients, whereas the expression of the main adiponectin receptor and genes involved in the downstream pathway of lipid and glucose metabolism is downregulated. In addition, the adiponectin-related metabolic disturbances strongly correlate with aerobic capacity (VO2 peak), sub-maximal exercise performance and muscle strength. These observations strengthen our hypothesis that adiponectin and its receptors play a key role in the development and progression of the "heart failure myopathy". The question whether adiponectin exerts beneficial rather than detrimental effects in HF is still left unanswered. This current research overview will elucidate the emerging role of adiponectin in HF and suggests potential therapeutic targets to tackle energy wasting in these patients.
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Rönn T, Volkov P, Tornberg Å, Elgzyri T, Hansson O, Eriksson KF, Groop L, Ling C. Extensive changes in the transcriptional profile of human adipose tissue including genes involved in oxidative phosphorylation after a 6-month exercise intervention. Acta Physiol (Oxf) 2014; 211:188-200. [PMID: 24495239 DOI: 10.1111/apha.12247] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Revised: 11/21/2013] [Accepted: 01/28/2014] [Indexed: 12/21/2022]
Abstract
AIM Adipose tissue has an important function in total energy homeostasis, and its dysregulation may contribute to lifestyle-related diseases such as type 2 diabetes, cancer and cardiovascular diseases. The aim of this study was to investigate genome-wide mRNA expression in adipose tissue in healthy men before and after an exercise intervention to identify genes or pathways that mediate the beneficial effect of regular exercise. We also investigated the difference in adipose tissue mRNA expression between individuals with or without a family history of type 2 diabetes. METHODS The 6-month supervised exercise intervention was conducted in 47 healthy men (age 37.8 ± 4.3 years, BMI 28.5 ± 3.6 kg m(-2) ) with a previous low level of physical activity. RNA was analysed using GeneChip Human Gene 1.0 ST arrays (Affymetrix) before and after the exercise. RESULTS We identified 2,560 significant transcripts differentially expressed before vs. after exercise with a false discovery rate (FDR) < 0.1%, including genes encoding the respiratory chain, histone subunits, small nucleolar RNAs and ribosomal proteins. Additionally, pathways enriched in response to exercise include the ribosome, oxidative phosphorylation, proteasome and many metabolic pathways, whereas the WNT and MAPK signalling pathways were down-regulated (FDR < 5%) after exercise. There were no significant differences in mRNA expression between individuals with or without a family history of type 2 diabetes. CONCLUSION Exercise increased the expression of genes involved in oxidative phosphorylation, which is the opposite of what has been seen in adipose tissue from elderly or obese individuals with low physical fitness, and our study thereby demonstrates a mechanism for the beneficial effect of exercise.
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Affiliation(s)
- T. Rönn
- Department of Clinical Sciences, Epigenetics and Diabetes; Lund University Diabetes Centre; CRC; Malmö Sweden
| | - P. Volkov
- Department of Clinical Sciences, Epigenetics and Diabetes; Lund University Diabetes Centre; CRC; Malmö Sweden
| | - Å. Tornberg
- Genetic & Molecular Epidemiology Unit; Lund University Diabetes Centre; CRC; Malmö Sweden
- Department of Health Sciences; Division of Physiotherapy; Lund University; Lund Sweden
| | - T. Elgzyri
- Department of Clinical Sciences, Diabetes and Endocrinology; Lund University Diabetes Centre; CRC; Malmö Sweden
| | - O. Hansson
- Department of Clinical Sciences, Diabetes and Endocrinology; Lund University Diabetes Centre; CRC; Malmö Sweden
| | - K.-F. Eriksson
- Department of Clinical Sciences, Vascular Diseases; Lund University; Malmö Sweden
| | - L. Groop
- Department of Clinical Sciences, Diabetes and Endocrinology; Lund University Diabetes Centre; CRC; Malmö Sweden
| | - C. Ling
- Department of Clinical Sciences, Epigenetics and Diabetes; Lund University Diabetes Centre; CRC; Malmö Sweden
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Woodworth-Hobbs ME, Hudson MB, Rahnert JA, Zheng B, Franch HA, Price SR. Docosahexaenoic acid prevents palmitate-induced activation of proteolytic systems in C2C12 myotubes. J Nutr Biochem 2014; 25:868-74. [PMID: 24835079 DOI: 10.1016/j.jnutbio.2014.03.017] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2013] [Revised: 03/26/2014] [Accepted: 03/27/2014] [Indexed: 12/17/2022]
Abstract
Saturated fatty acids like palmitate contribute to muscle atrophy in a number of conditions (e.g., type II diabetes) by altering insulin signaling. Akt is a key modulator of protein balance that inhibits the FoxO transcription factors (e.g., FoxO3) which selectively induce the expression of atrophy-inducing genes (atrogenes) in the ubiquitin-proteasome and autophagy-lysosome systems. Conversely, omega-3 polyunsaturated fatty acids have beneficial effects on insulin signaling and may preserve muscle mass. In an earlier report, the omega-3 fatty acid docosahexaenoic acid (DHA) protected myotubes from palmitate-induced atrophy; the mechanisms underlying the alterations in protein metabolism were not identified. This study investigated whether DHA prevents a palmitate-induced increase in proteolysis by restoring Akt/FoxO signaling. Palmitate increased the rate of protein degradation, while cotreatment with DHA prevented the response. Palmitate reduced the activation state of Akt and increased nuclear FoxO3 protein while decreasing its cytosolic level. Palmitate also increased the messenger RNAs (mRNAs) of two FoxO3 atrogene targets, the E3 ubiquitin ligase atrogin-1/MAFbx and the autophagy mediator Bnip3. DHA attenuated the effects of palmitate on Akt activation, FoxO3 localization and atrogene mRNAs. DHA, alone or in combination with palmitate and decreased the ratio of LC3B-II:LC3B-I protein as well as the rate of autophagosome formation, as indicated by reduced LC3B-II protein in the presence of 10 mmol/L methylamine, suggesting an independent effect of DHA on the macroautophagy pathway. These data indicate that palmitate induces myotube atrophy, at least in part, by activating multiple proteolytic systems and that DHA counters the catabolic effects of palmitate by restoring Akt/FoxO signaling.
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Affiliation(s)
- Myra E Woodworth-Hobbs
- Nutrition and Health Sciences Program, Graduate Division of Biological and Biomedical Sciences, Emory University, Atlanta, GA, USA; Department of Medicine, Renal Division, Emory University, Atlanta, GA, USA.
| | - Matthew B Hudson
- Department of Medicine, Renal Division, Emory University, Atlanta, GA, USA
| | - Jill A Rahnert
- Department of Medicine, Renal Division, Emory University, Atlanta, GA, USA
| | - Bin Zheng
- Department of Medicine, Renal Division, Emory University, Atlanta, GA, USA
| | - Harold A Franch
- Department of Medicine, Renal Division, Emory University, Atlanta, GA, USA
| | - S Russ Price
- Department of Medicine, Renal Division, Emory University, Atlanta, GA, USA; Atlanta VA Medical Center, Decatur, GA, USA
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Will K, Kuzinski J, Kalbe C, Palin MF, Rehfeldt C. Effects of leptin and adiponectin on the growth of porcine myoblasts are associated with changes in p44/42 MAPK signaling. Domest Anim Endocrinol 2013; 45:196-205. [PMID: 24209504 DOI: 10.1016/j.domaniend.2013.09.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2013] [Revised: 09/13/2013] [Accepted: 09/13/2013] [Indexed: 12/15/2022]
Abstract
We hypothesized that both adiponectin and leptin affect the growth of porcine skeletal muscle cells, with fatty acids acting as modifiers in adipokine action and that both adipokines influence the gene expression of their receptors. Therefore, the objective of this study was to investigate the effects of recombinant adiponectin and leptin on cell number (DNA) and DNA synthesis rate with and without oleic acid supplementation, on cell death, and on key intracellular signaling molecules of proliferating porcine myoblasts in vitro. Moreover, the mRNA expression of genes encoding for the leptin and adiponectin receptors (LEPR, ADIPOR1, ADIPOR2) as affected by leptin or adiponectin was examined. Recombinant porcine adiponectin (40 μg/mL) and leptin (20 ng/mL) increased DNA synthesis rate, measured as [(3)H]-thymidine incorporation (P < 0.01), reduced cell viability in terms of lactate dehydrogenase release (P < 0.05), or lowered DNA content after 24 h (P < 0.05). In adiponectin-treated cultures, oleic acid supplementation increased DNA synthesis rate and reduced cell number in a dose-dependent manner (P < 0.05). Both adiponectin (P = 0.07) and leptin (P < 0.05) induced a transient activation of p44/42 mitogen-activated protein kinase (MAPK) after 15 min, followed by decreases after 60 and 180 min (P < 0.05). Adiponectin tended to increase c-fos activation (P = 0.08) and decreased p53 activation at 180 min (P = 0.03). Both adiponectin and leptin down-regulated the abundance of ADIPOR2 mRNA and, transiently, of LEPR mRNA (P < 0.05). In conclusion, adiponectin and leptin may adversely affect the growth of porcine myoblasts, which is related to p44/42 MAPK signaling and associated with changes in ligand receptor gene expression.
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Affiliation(s)
- K Will
- Institute for Muscle Biology and Growth, Leibniz Institute for Farm Animal Biology (FBN), Wilhelm-Stahl-Allee 2, 18196 Dummerstorf, Germany
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