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Zhong Q, Zheng K, Li W, An K, Liu Y, Xiao X, Hai S, Dong B, Li S, An Z, Dai L. Post-translational regulation of muscle growth, muscle aging and sarcopenia. J Cachexia Sarcopenia Muscle 2023. [PMID: 37127279 DOI: 10.1002/jcsm.13241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 03/07/2023] [Accepted: 04/02/2023] [Indexed: 05/03/2023] Open
Abstract
Skeletal muscle makes up 30-40% of the total body mass. It is of great significance in maintaining digestion, inhaling and exhaling, sustaining body posture, exercising, protecting joints and many other aspects. Moreover, muscle is also an important metabolic organ that helps to maintain the balance of sugar and fat. Defective skeletal muscle function not only limits the daily activities of the elderly but also increases the risk of disability, hospitalization and death, placing a huge burden on society and the healthcare system. Sarcopenia is a progressive decline in muscle mass, muscle strength and muscle function with age caused by environmental and genetic factors, such as the abnormal regulation of protein post-translational modifications (PTMs). To date, many studies have shown that numerous PTMs, such as phosphorylation, acetylation, ubiquitination, SUMOylation, glycosylation, glycation, methylation, S-nitrosylation, carbonylation and S-glutathionylation, are involved in the regulation of muscle health and diseases. This article systematically summarizes the post-translational regulation of muscle growth and muscle atrophy and helps to understand the pathophysiology of muscle aging and develop effective strategies for diagnosing, preventing and treating sarcopenia.
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Affiliation(s)
- Qian Zhong
- Department of Endocrinology and Metabolism, General Practice Ward/International Medical Center Ward, General Practice Medical Center and National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Kun Zheng
- Department of Endocrinology and Metabolism, General Practice Ward/International Medical Center Ward, General Practice Medical Center and National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Wanmeng Li
- Department of Endocrinology and Metabolism, General Practice Ward/International Medical Center Ward, General Practice Medical Center and National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Kang An
- Department of Endocrinology and Metabolism, General Practice Ward/International Medical Center Ward, General Practice Medical Center and National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Yu Liu
- Department of Endocrinology and Metabolism, General Practice Ward/International Medical Center Ward, General Practice Medical Center and National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Xina Xiao
- Department of Endocrinology and Metabolism, General Practice Ward/International Medical Center Ward, General Practice Medical Center and National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Shan Hai
- Department of Endocrinology and Metabolism, General Practice Ward/International Medical Center Ward, General Practice Medical Center and National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Biao Dong
- Department of Endocrinology and Metabolism, General Practice Ward/International Medical Center Ward, General Practice Medical Center and National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Shuangqing Li
- Department of Endocrinology and Metabolism, General Practice Ward/International Medical Center Ward, General Practice Medical Center and National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Zhenmei An
- Department of Endocrinology and Metabolism, General Practice Ward/International Medical Center Ward, General Practice Medical Center and National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Lunzhi Dai
- Department of Endocrinology and Metabolism, General Practice Ward/International Medical Center Ward, General Practice Medical Center and National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
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Chiu HC, Yang RS, Weng TI, Chiu CY, Lan KC, Liu SH. A ubiquitous endocrine disruptor tributyltin induces muscle wasting and retards muscle regeneration. J Cachexia Sarcopenia Muscle 2023; 14:167-181. [PMID: 36382567 PMCID: PMC9891973 DOI: 10.1002/jcsm.13119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 09/14/2022] [Accepted: 10/10/2022] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Organotin pollutant tributyltin (TBT) is an environmental endocrine disrupting chemical and is a known obesogen and diabetogen. TBT can be detected in human following consumption of contaminated seafood or water. The decrease in muscle strength and quality has been shown to be associated with type 2 diabetes in older adults. However, the adverse effects of TBT on the muscle mass and function still remain unclear. Here, we investigated the effects and molecule mechanisms of low-dose TBT on skeletal muscle regeneration and atrophy/wasting using the cultured skeletal muscle cell and adult mouse models. METHODS The mouse myoblasts (C2C12) and differentiated myotubes were used to assess the in vitro effects of low-dose tributyltin (0.01-0.5 μM). The in vivo effects of TBT at the doses of 5 and 25 μg/kg/day (n = 6/group), which were five times lower than the established no observed adverse effect level (NOAEL) and equal to NOAEL, respectively, by oral administration for 4 weeks on muscle wasting and muscle regeneration were evaluated in a mouse model with or without glycerol-induced muscle injury/regeneration. RESULTS TBT reduced myogenic differentiation in myoblasts (myotube with 6-10 nuclei: 53.9 and 35.8% control for 0.05 and 0.1 μM, respectively, n = 4, P < 0.05). TBT also decreased myotube diameter, upregulated protein expression levels of muscle-specific ubiquitin ligases (Atrogin-1 and MuRF1), myostatin, phosphorylated AMPKα, and phosphorylated NFκB-p65, and downregulated protein expression levels of phosphorylated AKT and phosphorylated FoxO1 in myotubes (0.2 and 0.5 μM, n = 6, P < 0.05). Exposure of TBT in mice elevated body weight, decreased muscle mass, and induced muscular dysfunction (5 and 25 μg/kg, P > 0.05 and P < 0.05, respectively, n = 6). TBT inhibited soleus muscle regeneration in mice with glycerol-induced muscle injury (5 and 25 μg/kg, P > 0.05 and P < 0.05, respectively, n = 6). TBT upregulated protein expression levels of Atrogin-1, MuRF1, myostatin, and phosphorylated AMPKα and downregulated protein expression level of phosphorylated FoxO1 in the mouse soleus muscles (5 and 25 μg/kg, P > 0.05 and P < 0.05, respectively, n = 6). CONCLUSIONS This study demonstrates for the first time that low-dose TBT significantly inhibits myogenic differentiation and triggers myotube atrophy in a cell model and significantly decreases muscle regeneration and muscle mass and function in a mouse model. These findings suggest that low-dose TBT exposure may be an environmental risk factor for muscle regeneration inhibition, atrophy/wasting, and disease-related myopathy.
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Affiliation(s)
- Hsien-Chun Chiu
- Institute of Toxicology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Rong-Sen Yang
- Departments of Orthopaedics, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Te-I Weng
- Department of Forensic Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Chen-Yuan Chiu
- Center of Consultation, Center for Drug Evaluation, Taipei, Taiwan
| | - Kuo-Cheng Lan
- Department of Emergency Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - Shing-Hwa Liu
- Institute of Toxicology, College of Medicine, National Taiwan University, Taipei, Taiwan.,Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan.,Department of Pediatrics, College of Medicine, National Taiwan University, Taipei, Taiwan
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Han B, Sun Y, Zhang X, Yue P, Tian M, Yan D, Yin F, Qin B, Zhao Y. Exogenous proline enhances susceptibility of NSCLC to cisplatin via metabolic reprogramming and PLK1-mediated cell cycle arrest. Front Pharmacol 2022; 13:942261. [PMID: 35910374 PMCID: PMC9330219 DOI: 10.3389/fphar.2022.942261] [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: 05/12/2022] [Accepted: 06/28/2022] [Indexed: 12/24/2022] Open
Abstract
The occurrence of cisplatin resistance is still the main factor limiting the therapeutic effect of non-small cell lung cancer (NSCLC). It is urgent to elucidate the resistance mechanism and develop novel treatment strategies. Targeted metabolomics was first performed to detect amino acids’ content in cisplatin-resistant cancer cells considering the relationship between tumour metabolic rearrangement and chemotherapy resistance and chemotherapy resistance. We discovered that levels of most amino acids were significantly downregulated, whereas exogenous supplementation of proline could enhance the sensitivity of NSCLC cells to cisplatin, evidenced by inhibited cell viability and tumour growth in vitro and xenograft models. In addition, the combined treatment of proline and cisplatin suppressed ATP production through disruption of the TCA cycle and oxidative phosphorylation. Furthermore, transcriptomic analysis identified the cell cycle as the top enriched pathway in co-therapy cells, accompanied by significant down-regulation of PLK1, a serine/threonine-protein kinase. Mechanistic studies revealed that PLK1 inhibitor (BI2536) and CDDP have synergistic inhibitory effects on NSCLC cells, and cells transfected with lentivirus expressing shPLK1 showed significantly increased toxicity to cisplatin. Inhibition of PLK1 inactivated AMPK, a primary regulator of cellular energy homeostasis, ultimately leading to cell cycle arrest via FOXO3A-FOXM1 axis mediated transcriptional inhibition in cisplatin-resistant cells. In conclusion, our study demonstrates that exogenous proline exerts an adjuvant therapeutic effect on cisplatin resistance, and PLK1 may be considered an attractive target for the clinical treatment of cisplatin resistance in NSCLC.
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Affiliation(s)
- Bingjie Han
- Department of Translational Medical Center, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- *Correspondence: Bingjie Han,
| | - Yuanyuan Sun
- Department of Translational Medical Center, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Xiaofen Zhang
- Department of Obstetrics and Gynecology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Ping Yue
- Department of Translational Medical Center, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Meiling Tian
- Department of Translational Medical Center, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Dan Yan
- Department of Translational Medical Center, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Fanxiang Yin
- Department of Translational Medical Center, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Bo Qin
- Department of Translational Medical Center, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Yi Zhao
- Department of Translational Medical Center, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
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Alizadeh Pahlavani H. Exercise Therapy for People With Sarcopenic Obesity: Myokines and Adipokines as Effective Actors. Front Endocrinol (Lausanne) 2022; 13:811751. [PMID: 35250869 PMCID: PMC8892203 DOI: 10.3389/fendo.2022.811751] [Citation(s) in RCA: 39] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Accepted: 01/24/2022] [Indexed: 12/15/2022] Open
Abstract
Sarcopenic obesity is defined as a multifactorial disease in aging with decreased body muscle, decreased muscle strength, decreased independence, increased fat mass, due to decreased physical activity, changes in adipokines and myokines, and decreased satellite cells. People with sarcopenic obesity cause harmful changes in myokines and adipokines. These changes are due to a decrease interleukin-10 (IL-10), interleukin-15 (IL-15), insulin-like growth factor hormone (IGF-1), irisin, leukemia inhibitory factor (LIF), fibroblast growth factor-21 (FGF-21), adiponectin, and apelin. While factors such as myostatin, leptin, interleukin-6 (IL-6), interleukin-8 (IL-8), and resistin increase. The consequences of these changes are an increase in inflammatory factors, increased degradation of muscle proteins, increased fat mass, and decreased muscle tissue, which exacerbates sarcopenia obesity. In contrast, exercise, especially strength training, reverses this process, which includes increasing muscle protein synthesis, increasing myogenesis, increasing mitochondrial biogenesis, increasing brown fat, reducing white fat, reducing inflammatory factors, and reducing muscle atrophy. Since some people with chronic diseases are not able to do high-intensity strength training, exercises with blood flow restriction (BFR) are newly recommended. Numerous studies have shown that low-intensity BFR training produces the same increase in hypertrophy and muscle strength such as high-intensity strength training. Therefore, it seems that exercise interventions with BFR can be an effective way to prevent the exacerbation of sarcopenia obesity. However, due to limited studies on adipokines and exercises with BFR in people with sarcopenic obesity, more research is needed.
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Bae JH, Seo DY, Lee SH, Shin C, Jamrasi P, Han J, Song W. Effects of exercise on AKT/PGC1-α/FOXO3a pathway and muscle atrophy in cisplatin-administered rat skeletal muscle. THE KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY : OFFICIAL JOURNAL OF THE KOREAN PHYSIOLOGICAL SOCIETY AND THE KOREAN SOCIETY OF PHARMACOLOGY 2021; 25:585-592. [PMID: 34697269 PMCID: PMC8552830 DOI: 10.4196/kjpp.2021.25.6.585] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 08/19/2021] [Accepted: 08/26/2021] [Indexed: 01/06/2023]
Abstract
Cisplatin has been reported to cause side effects such as muscle wasting in
humans and rodents. The physiological mechanisms involved in preventing muscle
wasting, such as the regulation of AKT, PGC1-α, and autophagy-related
factor FOXO3a by MuRF 1 and Atrogin-1, remain unclear following different types
of exercise and in various skeletal muscle types. Eight-week-old male Wistar
rats (n = 34) were assigned to one of four groups: control (CON, n = 6),
cisplatin injection (1 mg/kg) without exercise (CC, n = 8), cisplatin (1 mg/kg)
+ resistance exercise (CRE, n = 9) group, and cisplatin (1 mg/kg) + aerobic
exercise (CAE, n = 11). The CRE group performed progressive ladder exercise
(starting with 10% of body weight on a 1-m ladder with 2-cm-interval grids, at
85°) for 8 weeks. The CAE group exercised by treadmill running (20 m/min
for 60 min daily, 4 times/week) for 8 weeks. Compared with the CC group, the
levels of the autophagy-related factors BNIP3, Beclin 1, LC3-II/I ratio, p62,
and FOXO3a in the gastrocnemius and soleus muscles were significantly decreased
in the CRE and CAE groups. The CRE and CAE groups further showed significantly
decreased MuRF 1 and Atrogin-1 levels and increased phosphorylation of AKT,
FOXO3a, and PGC1-α. These results suggest that both ladder and aerobic
exercise directly affected muscle wasting by modulating the
AKT/PGC1-α/FOXO3a signaling pathways regardless of the skeletal muscle
type.
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Affiliation(s)
- Jun Hyun Bae
- Health and Exercise Science Laboratory, Institute of Sports Science, Seoul National University, Seoul 08826, Korea
| | - Dae Yun Seo
- National ResearchLaboratory for Mitochondrial Signaling, Department of Physiology, College of Medicine, Smart Marine Therapeutics Center, Cardiovascular and Metabolic Disease Center, Inje University
| | - Sang Ho Lee
- Department of Taekwondo, Dong-A University, Busan 49315, Korea
| | - Chaeyoung Shin
- Health and Exercise Science Laboratory, Institute of Sports Science, Seoul National University, Seoul 08826, Korea
| | - Parivash Jamrasi
- Health and Exercise Science Laboratory, Institute of Sports Science, Seoul National University, Seoul 08826, Korea
| | - Jin Han
- National ResearchLaboratory for Mitochondrial Signaling, Department of Physiology, College of Medicine, Smart Marine Therapeutics Center, Cardiovascular and Metabolic Disease Center, Inje University
| | - Wook Song
- Health and Exercise Science Laboratory, Institute of Sports Science, Seoul National University, Seoul 08826, Korea.,Institute of Aging, Seoul National University, Seoul 08826, Korea
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Yu H, Huang Y, Ge Y, Hong X, Lin X, Tang K, Wang Q, Yang Y, Sun W, Huang Y, Luo H. Selenite-induced ROS/AMPK/FoxO3a/GABARAPL-1 signaling pathway modulates autophagy that antagonize apoptosis in colorectal cancer cells. Discov Oncol 2021; 12:35. [PMID: 35201430 PMCID: PMC8777540 DOI: 10.1007/s12672-021-00427-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Accepted: 08/26/2021] [Indexed: 01/14/2023] Open
Abstract
Previous studies have shown that selenium possessed chemotherapeutic effect against multiple malignant cancers, inducing diverse stress responses including apoptosis and autophagy. Selenite was previously shown to induce apoptosis and autophagy in colorectal cancer cells. However, the relationship between selenite-induced apoptosis and autophagy was not fully understood. Our results revealed a pro-survival role of selenite-induced autophagy against apoptosis in colorectal cancer cells. Real-time PCR array of autophagy-related genes showed that GABARAPL-1 was significantly upregulated in colorectal cancer cells, which was confirmed by western blot and immunofluorescence results. Knockdown of GABARAPL-1 significantly inhibited selenite-induced autophagy and enhanced apoptosis. Furthermore, we found that selenite-induced upregulation of GABARAPL-1 was caused by upregulated p-AMPK and FoxO3a level. Their interaction was correlated with involved in regulation of GABARAPL-1. We observed that activation and inhibition of AMPK influenced both autophagy and apoptosis level via FoxO3a/ GABARAPL-1 signaling, implying the pro-survival role of autophagy against apoptosis. Importantly, we corroborated these findings in a colorectal cancer xenograft animal model with immunohistochemistry and western blot results. Collectively, these results show that sodium selenite could induce ROS/AMPK/FoxO3a/GABARAPL-1-mediated autophagy and downregulate apoptosis in both colorectal cancer cells and colon xenograft model. These findings help to explore sodium selenite as a potential anti-cancer drug in clinical practices.
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Affiliation(s)
- Hailing Yu
- Guangdong Provincial Key Laboratory of Biomedical Imaging and Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital, Sun Yat-Sen University, No.52 of Meihua Dong Road, Xiangzhou District, Zhuhai, Guangdong Province, China
| | - Yin Huang
- Department of Cardiology, The Fifth Affiliated Hospital, Sun Yat-Sen University, Zhuhai, Guangdong Province, China
| | - Yanming Ge
- Department of Pharmacy, The Fifth Affiliated Hospital, Sun Yat-Sen University, Zhuhai, Guangdong Province, China
| | - Xiaopeng Hong
- Department of Hepatobiliary Surgery, The Fifth Affiliated Hospital, Sun Yat-Sen University, Zhuhai, Guangdong Province, China
| | - Xi Lin
- Guangdong Provincial Key Laboratory of Biomedical Imaging and Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital, Sun Yat-Sen University, No.52 of Meihua Dong Road, Xiangzhou District, Zhuhai, Guangdong Province, China
| | - Kexin Tang
- Guangdong Provincial Key Laboratory of Biomedical Imaging and Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital, Sun Yat-Sen University, No.52 of Meihua Dong Road, Xiangzhou District, Zhuhai, Guangdong Province, China
| | - Qiang Wang
- The Green Aerotechnics Research Institute of Chongqing Jiaotong University, Chongqing, China
| | - Yang Yang
- Institute of Basic Medical Sciences, Peking Union Medical College, Beijing, China
| | - Weiming Sun
- Guangdong Provincial Key Laboratory of Biomedical Imaging and Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital, Sun Yat-Sen University, No.52 of Meihua Dong Road, Xiangzhou District, Zhuhai, Guangdong Province, China
| | - Yongquan Huang
- Department of Ultrasound, The Fifth Affiliated Hospital, Sun Yat-Sen University, No.52 of Meihua Dong Road, Xiangzhou District, Zhuhai, Guangdong Province, China.
| | - Hui Luo
- Guangdong Provincial Key Laboratory of Biomedical Imaging and Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital, Sun Yat-Sen University, No.52 of Meihua Dong Road, Xiangzhou District, Zhuhai, Guangdong Province, China.
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Sun WX, Lou K, Chen LJ, Liu SD, Pang SG. Lipocalin-2: a role in hepatic gluconeogenesis via AMP-activated protein kinase (AMPK). J Endocrinol Invest 2021; 44:1753-1765. [PMID: 33423221 DOI: 10.1007/s40618-020-01494-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 12/23/2020] [Indexed: 01/19/2023]
Abstract
PURPOSE Evidence is accumulating that lipocalin2 (LCN2) is implicated in insulin resistance and glucose homeostasis, but the underlying possible mechanisms remain unclear. This study is to investigate the possible linkage between LCN2 and AMP-activated protein kinase (AMPK) or forkhead transcription factor O1 (FoxO1), which influences insulin sensitivity and gluconeogenesis in liver. METHODS LCN2 knockout (LCN2KO) mice and wild-type littermates were used to evaluate the effect of LCN2 on insulin sensitivity and hepatic gluconeogenesis through pyruvate tolerance test (PTT), glucose tolerance test (ipGTT), insulin tolerance test (ITT), and hyperinsulinemic-euglycemic clamps, respectively. LCN2KO mice and WT mice in vivo, and in vitro HepG2 cells were co-transfected with adenoviral FoxO1-siRNA (Ad-FoxO1-siRNA) or adenovirus expressing constitutively active form of AMPK (Ad-CA-AMPK), or dominant negative adenovirus AMPK (Ad-DN-AMPK), the relative mRNA and protein levels of two key gluconeogenic enzymes phosphoenolpyruvate carboxykinase (PEPCK) and glucose-6-phosphatase (G6P) were measured. RESULTS Improved insulin sensitivity and inhibited gluconeogenesis in the LCN2KO mice were confirmed by pyruvate tolerance tests and hyperinsulinemic-euglycemic clamps. Nuclear FoxO1 and its downstream genes PEECK and G6P were decreased in the livers of the LCN2KO mice, and AMPK activity was stimulated and directly phosphorylated FoxO1. In vitro, AMPK activity was inhibited in HepG2 cells overexpressing LCN2 leading to a decrease in phosphorylated FoxO1 and an increase in nuclear FoxO1. CONCLUSION The present study demonstrates that LCN2 regulates insulin sensitivity and glucose metabolism through inhibiting AMPK activity, and regulating FoxO1 and its downstream genes PEPCK/G6P, which regulate hepatic gluconeogenesis.
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Affiliation(s)
- W-X Sun
- Department of Pharmacy, Taishan Vocational College of Nursing, Taian, 271000, China
| | - K Lou
- Department of Endocrinology, Jinan Central Hospital, Cheeloo College of Medicine, Shandong University, 105 Jiefang Road, Jinan, 250013, Shandong Province, China
- Department of Endocrinology, Jinan Central Hospital Affiliated to Shandong First Medical University, Jinan, 250013, China
| | - L-J Chen
- Department of Endocrinology, Shandong Rongjun General Hospital, 23 Jiefang Road, Jinan, 250013, Shandong Province, China
| | - S-D Liu
- Department of Endocrinology, Shandong Rongjun General Hospital, 23 Jiefang Road, Jinan, 250013, Shandong Province, China.
| | - S-G Pang
- Department of Endocrinology, Jinan Central Hospital, Cheeloo College of Medicine, Shandong University, 105 Jiefang Road, Jinan, 250013, Shandong Province, China.
- Department of Endocrinology, Jinan Central Hospital Affiliated to Shandong First Medical University, Jinan, 250013, China.
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Marasco G, Dajti E, Ravaioli F, Brocchi S, Rossini B, Alemanni LV, Peta G, Bartalena L, Golfieri R, Festi D, Colecchia A, Renzulli M. Clinical impact of sarcopenia assessment in patients with liver cirrhosis. Expert Rev Gastroenterol Hepatol 2021; 15:377-388. [PMID: 33196344 DOI: 10.1080/17474124.2021.1848542] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Introduction: Sarcopenia is defined as loss of skeletal muscle mass, strength, and function, and it is associated with increased morbidity and mortality in patients with chronic liver disease.Areas covered: The aim of this review is to provide a detailed report on the pathophysiological mechanisms underlying sarcopenia in cirrhotic patients, the several imaging methods available for the assessment of sarcopenia and the clinical studies evaluating the prognostic role of sarcopenia presence in cirrhotic patients.Expert opinion: Sarcopenia pathogenesis is complex and multifaceted, as chronic catabolic conditions, increased energy expenditure, reduced appetite, side effects of multiple therapies, alterations in circulating levels of hormones, low protein synthesis, presence of ascites or portosystemic shunts are all factors contributing to muscle atrophy in cirrhotic patients. Computed tomography scan is the most validated method to evaluate muscle mass and quality. Sarcopenia is associated with a higher rate waitlist mortality, hepatic encephalopathy, and lower quality of life in patients with liver cirrhosis. Future studies should make an effort to unify and validate liver disease-specific cutoffs for the definition of sarcopenia.
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Affiliation(s)
- Giovanni Marasco
- Department of Medical and Surgical Sciences (DIMEC), University of Bologna, Bologna, Italy
| | - Elton Dajti
- Department of Medical and Surgical Sciences (DIMEC), University of Bologna, Bologna, Italy
| | - Federico Ravaioli
- Department of Medical and Surgical Sciences (DIMEC), University of Bologna, Bologna, Italy
| | - Stefano Brocchi
- Radiology Unit, Sant'Orsola Malpighi Hospital, Bologna, Italy
| | - Benedetta Rossini
- Department of Medical and Surgical Sciences (DIMEC), University of Bologna, Bologna, Italy
| | | | - Giuliano Peta
- Radiology Unit, Sant'Orsola Malpighi Hospital, Bologna, Italy
| | - Laura Bartalena
- Radiology Unit, Sant'Orsola Malpighi Hospital, Bologna, Italy
| | - Rita Golfieri
- Radiology Unit, Sant'Orsola Malpighi Hospital, Bologna, Italy
| | - Davide Festi
- Department of Medical and Surgical Sciences (DIMEC), University of Bologna, Bologna, Italy
| | - Antonio Colecchia
- Unit of Gastroenterology, Borgo Trento University Hospital of Verona, Verona, Italy
| | - Matteo Renzulli
- Radiology Unit, Sant'Orsola Malpighi Hospital, Bologna, Italy
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Maissan P, Mooij EJ, Barberis M. Sirtuins-Mediated System-Level Regulation of Mammalian Tissues at the Interface between Metabolism and Cell Cycle: A Systematic Review. BIOLOGY 2021; 10:biology10030194. [PMID: 33806509 PMCID: PMC7999230 DOI: 10.3390/biology10030194] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 02/20/2021] [Accepted: 02/25/2021] [Indexed: 02/06/2023]
Abstract
Sirtuins are a family of highly conserved NAD+-dependent proteins and this dependency links Sirtuins directly to metabolism. Sirtuins' activity has been shown to extend the lifespan of several organisms and mainly through the post-translational modification of their many target proteins, with deacetylation being the most common modification. The seven mammalian Sirtuins, SIRT1 through SIRT7, have been implicated in regulating physiological responses to metabolism and stress by acting as nutrient sensors, linking environmental and nutrient signals to mammalian metabolic homeostasis. Furthermore, mammalian Sirtuins have been implicated in playing major roles in mammalian pathophysiological conditions such as inflammation, obesity and cancer. Mammalian Sirtuins are expressed heterogeneously among different organs and tissues, and the same holds true for their substrates. Thus, the function of mammalian Sirtuins together with their substrates is expected to vary among tissues. Any therapy depending on Sirtuins could therefore have different local as well as systemic effects. Here, an introduction to processes relevant for the actions of Sirtuins, such as metabolism and cell cycle, will be followed by reasoning on the system-level function of Sirtuins and their substrates in different mammalian tissues. Their involvement in the healthy metabolism and metabolic disorders will be reviewed and critically discussed.
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Affiliation(s)
- Parcival Maissan
- Synthetic Systems Biology and Nuclear Organization, Swammerdam Institute for Life Sciences, University of Amsterdam, 1098 XH Amsterdam, The Netherlands;
| | - Eva J. Mooij
- Systems Biology, School of Biosciences and Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XH, Surrey, UK;
- Centre for Mathematical and Computational Biology, CMCB, University of Surrey, Guildford GU2 7XH, Surrey, UK
| | - Matteo Barberis
- Synthetic Systems Biology and Nuclear Organization, Swammerdam Institute for Life Sciences, University of Amsterdam, 1098 XH Amsterdam, The Netherlands;
- Systems Biology, School of Biosciences and Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XH, Surrey, UK;
- Centre for Mathematical and Computational Biology, CMCB, University of Surrey, Guildford GU2 7XH, Surrey, UK
- Correspondence: or ; Tel.: +44-1483-684-610
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10
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Lyu X, Gao Y, Liu Q, Zhao H, Zhou H, Pan S. Exercise-induced muscle damage: multi-parametric MRI quantitative assessment. BMC Musculoskelet Disord 2021; 22:239. [PMID: 33653313 PMCID: PMC7927395 DOI: 10.1186/s12891-021-04085-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 02/15/2021] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND To explore the value of magnetic resonance quantitative analysis using diffusion tensor imaging, T2 mapping, and intravoxel incoherent motion in the evaluation of eccentric exercise-induced muscle damage and to compare the effects of various eccentric exercise modes at different time points in rats. METHODS A total of 174 Sprague-Dawley male rats were randomly divided into five groups: control, once-only exercise, continuous exercise, intermittent exercise, and once-fatigue exercise groups. Each experimental group was divided into seven time-subgroups: 0.5 h, 24 h, 48 h, 72 h, 96 h, 120 h and 168 h after exercise. The quadriceps femoris muscles were then scanned using magnetic resonance imaging. The apparent diffusion coefficient and fractional anisotropy values of diffusion tensor imaging, T2 values of T2 mapping, D and D* values of intravoxel incoherent motion and optical density values of desmin were measured. Associations among different eccentric exercise programmes, magnetic resonance imaging findings, and histopathological results were evaluated. Dunnett's test, two-way repeated measures analysis of variance, and Pearson correlation analysis were used for statistical analysis. RESULTS Diffusion tensor imaging showed that the number of muscle fibre bundles decreased to varying degrees with different time points and eccentric exercises. Apparent diffusion coefficient values of the exercise groups showed a trend that first increased and then decreased, the opposite of fractional anisotropy. The specimens in all eccentric exercise programmes showed high signal T2 values after exercise, the highest among which was in the once-fatigue exercise group. D and D* in the experimental groups were significantly higher than those in the control group at 0.5-48 h after exercise. The apparent diffusion coefficient, fractional anisotropy, T2, D and D* values correlated with the optical density values of desmin. CONCLUSIONS Diffusion tensor imaging, T2 mapping, and intravoxel incoherent motion technology accurately reflect the degree of skeletal muscle damage and recovery associated with eccentric exercise. The degree of muscle damage was the lowest in the continuous exercise group and the highest in the once-fatigue exercise group, which may provide more information and guidance for the formulation of physical and athletic training programmes.
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Affiliation(s)
- Xiaohong Lyu
- Department of Radiology, Shengjing Hospital of China Medical University, 36 Sanhao Street, Heping District, Shenyang, 110004, China.,Department of Radiology, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou, 121000, China
| | - Yue Gao
- Department of Radiology, Shengjing Hospital of China Medical University, 36 Sanhao Street, Heping District, Shenyang, 110004, China
| | - Qiang Liu
- Department of Radiology, Shengjing Hospital of China Medical University, 36 Sanhao Street, Heping District, Shenyang, 110004, China
| | - Heng Zhao
- Department of Radiology, Shengjing Hospital of China Medical University, 36 Sanhao Street, Heping District, Shenyang, 110004, China
| | - Huadong Zhou
- Department of Radiology, Shengjing Hospital of China Medical University, 36 Sanhao Street, Heping District, Shenyang, 110004, China
| | - Shinong Pan
- Department of Radiology, Shengjing Hospital of China Medical University, 36 Sanhao Street, Heping District, Shenyang, 110004, China.
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11
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Can Exercise-Induced Muscle Damage Be a Good Model for the Investigation of the Anti-Inflammatory Properties of Diet in Humans? Biomedicines 2021; 9:biomedicines9010036. [PMID: 33466327 PMCID: PMC7824757 DOI: 10.3390/biomedicines9010036] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 12/23/2020] [Accepted: 12/29/2020] [Indexed: 12/25/2022] Open
Abstract
Subclinical, low-grade, inflammation is one of the main pathophysiological mechanisms underlying the majority of chronic and non-communicable diseases. Several methodological approaches have been applied for the assessment of the anti-inflammatory properties of nutrition, however, their impact in human body remains uncertain, because of the fact that the majority of the studies reporting anti-inflammatory effect of dietary patterns, have been performed under laboratory settings and/or in animal models. Thus, the extrapolation of these results to humans is risky. It is therefore obvious that the development of an inflammatory model in humans, by which we could induce inflammatory responses to humans in a regulated, specific, and non-harmful way, could greatly facilitate the estimation of the anti-inflammatory properties of diet in a more physiological way and mechanistically relevant way. We believe that exercise-induced muscle damage (EIMD) could serve as such a model, either in studies investigating the homeostatic responses of individuals under inflammatory stimuli or for the estimation of the anti-inflammatory or pro-inflammatory potential of dietary patterns, foods, supplements, nutrients, or phytochemicals. Thus, in this review we discuss the possibility of exercise-induced muscle damage being an inflammation model suitable for the assessment of the anti-inflammatory properties of diet in humans.
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12
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Su R, Wang B, Zhang M, Luo Y, Wang D, Zhao L, Su L, Duan Y, Faucitano L, Jin Y. Effects of energy supplements on the differentiation of skeletal muscle satellite cells. Food Sci Nutr 2021; 9:357-366. [PMID: 33473298 PMCID: PMC7802567 DOI: 10.1002/fsn3.2001] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 10/19/2020] [Accepted: 10/25/2020] [Indexed: 01/14/2023] Open
Abstract
To investigate the effects of the activator of AMPK and high glucose on the differentiation of mouse SMSCs, primary SMSCs were isolated from mouse extensor digitorum longus muscle and grown to near confluence (80%). Postconfluent cells were cultured in a growth medium with different inductors: AICAR, glucose, and AICAR mixed with glucose. The specific protein expressions of SMSCs, myoblasts, adipocytes, and brown adipocytes were analyzed on days 0, 3, 5, 7, and 10. The results showed treatment with AICAR in SMSCs markedly activated AMPK phosphorylation (p < .05) and increased protein expression of Pax7 and MyoD (p < .05), high concentrations of intracellular glucose upregulated UCP-1 protein expression and enhanced lipid accumulation (p < .05), the cowork of AICAR and glucose affected a decrease on MyoD, PPARg, and UCP-1 expression (p < .05) and an increase on Pax7. The present study indicated that the certain energy supplements influence the direction of SMSC differentiation which may contribution on the structure of muscle and meat quality, sequentially.
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Affiliation(s)
- Rina Su
- College of Food Science and EngineeringInner Mongolia Agriculture UniversityHohhotChina
- Inner Mongolia Vocational college of Chemical EngineeringHohhotChina
| | - Bohui Wang
- College of Food Science and EngineeringInner Mongolia Agriculture UniversityHohhotChina
| | - Min Zhang
- College of Food Science and EngineeringInner Mongolia Agriculture UniversityHohhotChina
| | - Yulong Luo
- College of Food Science and EngineeringInner Mongolia Agriculture UniversityHohhotChina
| | - Debao Wang
- College of Food Science and EngineeringInner Mongolia Agriculture UniversityHohhotChina
| | - Lihua Zhao
- College of Food Science and EngineeringInner Mongolia Agriculture UniversityHohhotChina
| | - Lin Su
- College of Food Science and EngineeringInner Mongolia Agriculture UniversityHohhotChina
| | - Yan Duan
- College of Food Science and EngineeringInner Mongolia Agriculture UniversityHohhotChina
| | - Luigi Faucitano
- Agriculture and Agri‐Food CanadaSherbrooke Research and Development CentreSherbrookeQCCanada
| | - Ye Jin
- College of Food Science and EngineeringInner Mongolia Agriculture UniversityHohhotChina
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13
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Brown JL, Lawrence MM, Ahn B, Kneis P, Piekarz KM, Qaisar R, Ranjit R, Bian J, Pharaoh G, Brown C, Peelor FF, Kinter MT, Miller BF, Richardson A, Van Remmen H. Cancer cachexia in a mouse model of oxidative stress. J Cachexia Sarcopenia Muscle 2020; 11:1688-1704. [PMID: 32918528 PMCID: PMC7749559 DOI: 10.1002/jcsm.12615] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 06/03/2020] [Accepted: 07/07/2020] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND Cancer is associated with muscle atrophy (cancer cachexia) that is linked to up to 40% of cancer-related deaths. Oxidative stress is a critical player in the induction and progression of age-related loss of muscle mass and weakness (sarcopenia); however, the role of oxidative stress in cancer cachexia has not been defined. The purpose of this study was to examine if elevated oxidative stress exacerbates cancer cachexia. METHODS Cu/Zn superoxide dismutase knockout (Sod1KO) mice were used as an established mouse model of elevated oxidative stress. Cancer cachexia was induced by injection of one million Lewis lung carcinoma (LLC) cells or phosphate-buffered saline (saline) into the hind flank of female wild-type mice or Sod1KO mice at approximately 4 months of age. The tumour developed for 3 weeks. Muscle mass, contractile function, neuromuscular junction (NMJ) fragmentation, metabolic proteins, mitochondrial function, and motor neuron function were measured in wild-type and Sod1KO saline and tumour-bearing mice. Data were analysed by two-way ANOVA with Tukey-Kramer post hoc test when significant F ratios were determined and α was set at 0.05. Unless otherwise noted, results in abstract are mean ±SEM. RESULTS Muscle mass and cross-sectional area were significantly reduced, in tumour-bearing mice. Metabolic enzymes were dysregulated in Sod1KO mice and cancer exacerbated this phenotype. NMJ fragmentation was exacerbated in tumour-bearing Sod1KO mice. Myofibrillar protein degradation increased in tumour-bearing wild-type mice (wild-type saline, 0.00847 ± 0.00205; wildtype LLC, 0.0211 ± 0.00184) and tumour-bearing Sod1KO mice (Sod1KO saline, 0.0180 ± 0.00118; Sod1KO LLC, 0.0490 ± 0.00132). Muscle mitochondrial oxygen consumption was reduced in tumour-bearing mice compared with saline-injected wild-type mice. Mitochondrial protein degradation increased in tumour-bearing wild-type mice (wild-type saline, 0.0204 ± 0.00159; wild-type LLC, 0.167 ± 0.00157) and tumour-bearing Sod1KO mice (Sod1KO saline, 0.0231 ± 0.00108; Sod1 KO LLC, 0.0645 ± 0.000631). Sciatic nerve conduction velocity was decreased in tumour-bearing wild-type mice (wild-type saline, 38.2 ± 0.861; wild-type LLC, 28.8 ± 0.772). Three out of eleven of the tumour-bearing Sod1KO mice did not survive the 3-week period following tumour implantation. CONCLUSIONS Oxidative stress does not exacerbate cancer-induced muscle loss; however, cancer cachexia may accelerate NMJ disruption.
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Affiliation(s)
- Jacob L Brown
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Marcus M Lawrence
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Bumsoo Ahn
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Parker Kneis
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Katarzyna M Piekarz
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA.,Oklahoma Center for Neuroscience, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Rizwan Qaisar
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Rojina Ranjit
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Jan Bian
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Gavin Pharaoh
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Chase Brown
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Fredrick F Peelor
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Michael T Kinter
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Benjamin F Miller
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Arlan Richardson
- Oklahoma City VA Medical Center, Oklahoma City, OK, USA.,Reynolds Center for Aging Research, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Holly Van Remmen
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA.,Oklahoma City VA Medical Center, Oklahoma City, OK, USA.,Oklahoma Center for Neuroscience, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
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14
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Lysenko EA, Popov DV, Vepkhvadze TF, Sharova AP, Vinogradova OL. Moderate-Intensity Strength Exercise to Exhaustion Results in More Pronounced Signaling Changes in Skeletal Muscles of Strength-Trained Compared With Untrained Individuals. J Strength Cond Res 2020; 34:1103-1112. [PMID: 30299394 DOI: 10.1519/jsc.0000000000002901] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Lysenko, EA, Popov, DV, Vepkhvadze, TF, Sharova, AP, and Vinogradova, OL. Moderate-intensity strength exercise to exhaustion results in more pronounced signaling changes in skeletal muscles of strength-trained compared with untrained individuals. J Strength Cond Res 34(4): 1103-1112, 2020-The aim of our investigation was to compare the response pattern of signaling proteins and genes regulating protein synthesis and degradation in skeletal muscle after strength exercise sessions performed to volitional fatigue in strength-trained and untrained males. Eight healthy recreationally active males and 8 power-lifting athletes performed 4 sets of unilateral leg presses to exhaustion (65% 1 repetition maximum). Biopsy samples of m. vastus lateralis were obtained before, 1 and 5 hours after cessation of exercise. Phosphorylation of p70S6k, 4EBP1, and ACC increased, whereas phosphorylation of eEF2 and FOXO1 decreased only in the trained group after exercise. Expression of DDIT4, MURF1, and FOXO1 mRNAs increased and expression of MSTN mRNA decreased also only in the trained group after exercise. In conclusion, moderate-intensity strength exercise performed to volitional fatigue changed the phosphorylation status of mTORC1 downstream signaling molecules and markers of ubiquitin-proteasome system activation in trained individuals, suggesting activation of protein synthesis and degradation. In contrast to the trained group, signaling responses in the untrained group were considerably less pronounced. It can be assumed that the slowdown in muscle mass gain as the athletes increase in qualification cannot be associated with a decrease in the sensitivity of systems regulating protein metabolism, but possibly with inadequate intake or assimilation of nutrients necessary for anabolism. Perhaps, the intake of highly digestible protein or protein-carbohydrate dietary supplements could contribute to the increase in muscle mass in strength athletes.
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Affiliation(s)
- Evgeny A Lysenko
- Laboratory of Exercise Physiology, SSC RF Institute of Biomedical Problems of Russian Academy of Sciences, Moscow, Russia; and.,Faculty of Fundamental Medicine, M. V. Lomonosov Moscow State University, Moscow, Russia
| | - Daniil V Popov
- Laboratory of Exercise Physiology, SSC RF Institute of Biomedical Problems of Russian Academy of Sciences, Moscow, Russia; and.,Faculty of Fundamental Medicine, M. V. Lomonosov Moscow State University, Moscow, Russia
| | - Tatiana F Vepkhvadze
- Laboratory of Exercise Physiology, SSC RF Institute of Biomedical Problems of Russian Academy of Sciences, Moscow, Russia; and
| | - Anna P Sharova
- Laboratory of Exercise Physiology, SSC RF Institute of Biomedical Problems of Russian Academy of Sciences, Moscow, Russia; and
| | - Olga L Vinogradova
- Laboratory of Exercise Physiology, SSC RF Institute of Biomedical Problems of Russian Academy of Sciences, Moscow, Russia; and.,Faculty of Fundamental Medicine, M. V. Lomonosov Moscow State University, Moscow, Russia
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15
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Saneyasu T, Honda K, Kamisoyama H. Myostatin Increases Smad2 Phosphorylation and Atrogin-1 Expression in Chick Embryonic Myotubes. J Poult Sci 2019; 56:224-230. [PMID: 32055218 PMCID: PMC7005388 DOI: 10.2141/jpsa.0180092] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Accepted: 11/12/2018] [Indexed: 01/07/2023] Open
Abstract
Skeletal muscle mass is an important trait in poultry meat production. In mammals, myostatin, a negative regulator of skeletal muscle growth, activates Smad transcription factors and induces the expression of atrogin-1 by regulating the Akt/FOXO pathway. Although the amino acid sequence of chicken myostatin is known to be completely identical to its mammalian counterpart, previous studies in chicken skeletal muscles have implied that the physiological roles of chicken myostatin are different from those of mammals. Furthermore, it remains to be elucidated whether myostatin affects cellular signaling factors and atrogin-1 expression. In this study, using chick embryonic myotubes, we found that myostatin significantly increased the phosphorylation rate of Smad2 and mRNA levels of atrogin-1. No significant change was observed in the phosphorylation of Akt and FOXO1. These in vitro results suggest that the molecular mechanisms underlying myostatin-induced expression of atrogin-1 might be different between chickens and mammals.
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Affiliation(s)
- Takaoki Saneyasu
- Graduate School of Agricultural Science, Kobe University, Kobe 657-8501, Japan
| | - Kazuhisa Honda
- Graduate School of Agricultural Science, Kobe University, Kobe 657-8501, Japan
| | - Hiroshi Kamisoyama
- Graduate School of Agricultural Science, Kobe University, Kobe 657-8501, Japan
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16
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Saline M, Badertscher L, Wolter M, Lau R, Gunnarsson A, Jacso T, Norris T, Ottmann C, Snijder A. AMPK and AKT protein kinases hierarchically phosphorylate the N-terminus of the FOXO1 transcription factor, modulating interactions with 14-3-3 proteins. J Biol Chem 2019; 294:13106-13116. [PMID: 31308176 DOI: 10.1074/jbc.ra119.008649] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Revised: 07/10/2019] [Indexed: 11/06/2022] Open
Abstract
Forkhead box protein O1 (FOXO1) is a transcription factor involved in various cellular processes such as glucose metabolism, development, stress resistance, and tumor suppression. FOXO1's transcriptional activity is controlled by different environmental cues through a myriad of posttranslational modifications. In response to growth factors, the serine/threonine kinase AKT phosphorylates Thr24 and Ser256 in FOXO1 to stimulate binding of 14-3-3 proteins, causing FOXO1 inactivation. In contrast, low nutrient and energy levels induce FOXO1 activity. AMP-activated protein kinase (AMPK), a master regulator of cellular energy homeostasis, partly mediates this effect through phosphorylation of Ser383 and Thr649 in FOXO1. In this study, we identified Ser22 as an additional AMPK phosphorylation site in FOXO1's N terminus, with Ser22 phosphorylation preventing binding of 14-3-3 proteins. The crystal structure of a FOXO1 peptide in complex with 14-3-3 σ at 2.3 Å resolution revealed that this is a consequence of both steric hindrance and electrostatic repulsion. Furthermore, we found that AMPK-mediated Ser22 phosphorylation impairs Thr24 phosphorylation by AKT in a hierarchical manner. Thus, numerous mechanisms maintain FOXO1 activity via AMPK signaling. AMPK-mediated Ser22 phosphorylation directly and indirectly averts binding of 14-3-3 proteins, whereas phosphorylation of Ser383 and Thr649 complementarily stimulates FOXO1 activity. Our results shed light on a mechanism that integrates inputs from both AMPK and AKT signaling pathways in a small motif to fine-tune FOXO1 transcriptional activity.
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Affiliation(s)
- Maria Saline
- Discovery Biology, Discovery Sciences, R&D, AstraZeneca, Gothenburg, Sweden
| | - Lukas Badertscher
- Discovery Biology, Discovery Sciences, R&D, AstraZeneca, Gothenburg, Sweden
| | - Madita Wolter
- Laboratory of Chemical Biology, Department of Biomedical Engineering, Eindhoven University of Technology and Institute for Complex Molecular Systems, Eindhoven University of Technology, P. O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Roxanne Lau
- Laboratory of Chemical Biology, Department of Biomedical Engineering, Eindhoven University of Technology and Institute for Complex Molecular Systems, Eindhoven University of Technology, P. O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Anders Gunnarsson
- Discovery Biology, Discovery Sciences, R&D, AstraZeneca, Gothenburg, Sweden
| | - Tomas Jacso
- Discovery Biology, Discovery Sciences, R&D, AstraZeneca, Gothenburg, Sweden
| | - Tyrrell Norris
- Discovery Biology, Discovery Sciences, R&D, AstraZeneca, Gothenburg, Sweden
| | - Christian Ottmann
- Laboratory of Chemical Biology, Department of Biomedical Engineering, Eindhoven University of Technology and Institute for Complex Molecular Systems, Eindhoven University of Technology, P. O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Arjan Snijder
- Discovery Biology, Discovery Sciences, R&D, AstraZeneca, Gothenburg, Sweden.
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17
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Lysenko EA, Popov DV, Vepkhvadze TF, Sharova AP, Vinogradova OL. Signaling responses to high and moderate load strength exercise in trained muscle. Physiol Rep 2019; 7:e14100. [PMID: 31090216 PMCID: PMC6517334 DOI: 10.14814/phy2.14100] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Revised: 04/23/2019] [Accepted: 04/26/2019] [Indexed: 11/24/2022] Open
Abstract
We examined signaling responses in the skeletal muscle of strength athletes after strength exercises under high and moderate load. Eight trained male powerlifters were recruited. The volunteers performed four sets of leg presses to volitional fatigue using a moderate load (65% 1-repetition maximum [1RM]) for one leg, and a high load (85% 1RM) for the contralateral leg. The work volume performed by the leg moving a moderate load was higher than that of the contralateral leg moving a high load. Biopsy of the m. vastus lateralis was performed before, and at 1, 5, and 10 h after, cessation of exercise. Phosphorylation of p70S6kThr389 , 4E-BP1Thr37/46 , and ACCSer79 increased after moderate load exercises, whereas phosphorylation of ERK1/2Thr202/Tyr204 increased, and that of eEF2Thr56 decreased, after high load exercises. Exercise under a moderate load and a high work volume activated mTORC1-dependent signaling in trained skeletal muscle, whereas exercise under a high load but lower work volume activated the MEK-ERK1/2 signaling cascade and eEF2.
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Affiliation(s)
- Evgeny A. Lysenko
- Laboratory of Exercise PhysiologySSC RF Institute of Biomedical Problems RASMoscowRussia
- Faculty of Fundamental MedicineM.V. Lomonosov Moscow State UniversityMoscowRussia
| | - Daniil V. Popov
- Laboratory of Exercise PhysiologySSC RF Institute of Biomedical Problems RASMoscowRussia
- Faculty of Fundamental MedicineM.V. Lomonosov Moscow State UniversityMoscowRussia
| | - Tatiana F. Vepkhvadze
- Laboratory of Exercise PhysiologySSC RF Institute of Biomedical Problems RASMoscowRussia
| | - Anna P. Sharova
- Laboratory of Exercise PhysiologySSC RF Institute of Biomedical Problems RASMoscowRussia
| | - Olga L. Vinogradova
- Laboratory of Exercise PhysiologySSC RF Institute of Biomedical Problems RASMoscowRussia
- Faculty of Fundamental MedicineM.V. Lomonosov Moscow State UniversityMoscowRussia
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Abstract
Sarcopenia (severe muscle depletion) is a prevalent muscle abnormality in patients with cirrhosis that confers poor prognosis both pre- and post-liver transplantation. The pathogenesis of sarcopenia is multifactorial and results from an imbalance between protein synthesis and breakdown. Nutritional, metabolic, and biochemical abnormalities seen in chronic liver disease alter whole body protein homeostasis. Hyperammonemia, increased autophagy, proteasomal activity, lower protein synthesis, and impaired mitochondrial function play an important role in muscle depletion in cirrhosis. Factors including cellular energy status, availability of metabolic substrates (e.g., branched-chain amino acids), alterations in the endocrine system (insulin resistance, circulating levels of insulin, insulin-like growth factor-1, corticosteroids, and testosterone), cytokines, myostatin, and exercise are involved in regulating muscle mass. A favored atrophy of type II fast-twitch glycolytic fibers seems to occur in patients with cirrhosis and sarcopenia. Identification of muscle biological abnormalities and underlying mechanisms is required to plan clinical trials to reverse sarcopenia through modulation of specific mechanisms. Accordingly, a combination of nutritional, physical, and pharmacological interventions might be necessary to reverse sarcopenia in cirrhosis. Moderate exercise should be combined with appropriate energy and protein intake, in accordance with clinical guidelines. Interventions with branched chain amino acids, testosterone, carnitine, or ammonia-lowering therapies should be considered individually. Various factors such as dose, type, duration of supplementations, etiology of cirrhosis, amount of dietary protein intake, and compliance with supplementation and exercise should be the focus of future large randomized controlled trials investigating both prevention and treatment of sarcopenia in this patient population.
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19
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FoxO1: a novel insight into its molecular mechanisms in the regulation of skeletal muscle differentiation and fiber type specification. Oncotarget 2018; 8:10662-10674. [PMID: 27793012 PMCID: PMC5354690 DOI: 10.18632/oncotarget.12891] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 10/19/2016] [Indexed: 02/03/2023] Open
Abstract
FoxO1, a member of the forkhead transcription factor forkhead box protein O (FoxO) family, is predominantly expressed in most muscle types. FoxO1 is a key regulator of muscle growth, metabolism, cell proliferation and differentiation. In the past two decades, many researches have indicated that FoxO1 is a negative regulator of skeletal muscle differentiation while contrasting opinions consider that FoxO1 is crucial for myoblast fusion. FoxO1 is expressed much higher in fast twitch fiber enriched muscles than in slow muscles and is also closely related to muscle fiber type specification. In this review, we summarize the molecular mechanisms of FoxO1 in the regulation of skeletal muscle differentiation and fiber type specification.
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20
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Rovira M, Arrey G, Planas JV. Exercise-Induced Hypertrophic and Oxidative Signaling Pathways and Myokine Expression in Fast Muscle of Adult Zebrafish. Front Physiol 2017; 8:1063. [PMID: 29326600 PMCID: PMC5741866 DOI: 10.3389/fphys.2017.01063] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Accepted: 12/04/2017] [Indexed: 12/11/2022] Open
Abstract
Skeletal muscle is a plastic tissue that undergoes cellular and metabolic adaptations under conditions of increased contractile activity such as exercise. Using adult zebrafish as an exercise model, we previously demonstrated that swimming training stimulates hypertrophy and vascularization of fast muscle fibers, consistent with the known muscle growth-promoting effects of exercise and with the resulting increased aerobic capacity of this tissue. Here we investigated the potential involvement of factors and signaling mechanisms that could be responsible for exercise-induced fast muscle remodeling in adult zebrafish. By subjecting zebrafish to swimming-induced exercise, we observed an increase in the activity of mammalian target of rapamycin (mTOR) and Mef2 protein levels in fast muscle. We also observed an increase in the protein levels of the mitotic marker phosphorylated histone H3 that correlated with an increase in the protein expression levels of Pax7, a satellite-like cell marker. Furthermore, the activity of AMP-activated protein kinase (AMPK) was also increased by exercise, in parallel with an increase in the mRNA expression levels of pgc1α and also of pparda, a β-oxidation marker. Changes in the mRNA expression levels of slow and fast myosin markers further supported the notion of an exercise-induced aerobic phenotype in zebrafish fast muscle. The mRNA expression levels of il6, il6r, apln, aplnra and aplnrb, sparc, decorin and igf1, myokines known in mammals to be produced in response to exercise and to signal through mTOR/AMPK pathways, among others, were increased in fast muscle of exercised zebrafish. These results support the notion that exercise increases skeletal muscle growth and myogenesis in adult zebrafish through the coordinated activation of the mTOR-MEF2 and AMPK-PGC1α signaling pathways. These results, coupled with altered expression of markers for oxidative metabolism and fast-to-slow fiber-type switch, also suggest improved aerobic capacity as a result of swimming-induced exercise. Finally, the induction of myokine expression by swimming-induced exercise support the hypothesis that these myokines may have been produced and secreted by the exercised zebrafish muscle and acted on fast muscle cells to promote metabolic remodeling. These results support the use of zebrafish as a suitable model for studies on muscle remodeling in vertebrates, including humans.
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Affiliation(s)
- Mireia Rovira
- Departament de Biologia Cel·lular, Facultat de Biologia, Fisiologia i Immunologia, Universitat de Barcelona, Barcelona, Spain
| | - Gerard Arrey
- Departament de Biologia Cel·lular, Facultat de Biologia, Fisiologia i Immunologia, Universitat de Barcelona, Barcelona, Spain
| | - Josep V Planas
- Departament de Biologia Cel·lular, Facultat de Biologia, Fisiologia i Immunologia, Universitat de Barcelona, Barcelona, Spain.,Institut de Biomedicina de la Universitat de Barcelona, Barcelona, Spain
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Effect of eccentric action velocity on expression of genes related to myostatin signaling pathway in human skeletal muscle. Biol Sport 2017; 35:111-119. [PMID: 30455539 PMCID: PMC6234307 DOI: 10.5114/biolsport.2018.71600] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2016] [Revised: 01/12/2017] [Accepted: 10/14/2017] [Indexed: 01/05/2023] Open
Abstract
The aim of this study was to investigate the effects of an acute bout of eccentric actions, performed at fast velocity (210º.s-1) and at slow velocity (20º.s-1), on the gene expression of regulatory components of the myostatin (MSTN) signalling pathway. Participants performed an acute bout of eccentric actions at either a slow or a fast velocity. Muscle biopsy samples were taken before, immediately after, and 2 h after the exercise bout. The gene expression of the components of the MSTN pathway was assessed by real-time PCR. No change was observed in MSTN, ACTRIIB, GASP-1 or FOXO-3a gene expression after either slow or fast eccentric actions (p > 0.05). However, the MSTN inhibitors follistatin (FST), FST-like-3 (FSTL3) and SMAD-7 were significantly increased 2 h after both eccentric actions (p < 0.05). No significant difference between bouts was found before, immediately after, or 2 h after the eccentric actions (slow and fast velocities, p > 0.05). The current findings indicate that a bout of eccentric actions activates the expression of MSTN inhibitors. However, no difference was observed in MSTN inhibitors’ gene expression when comparing slow and fast eccentric actions. It is possible that the greater time under tension induced by slow eccentric (SE) actions might compensate the effect of the greater velocity of fast eccentric (FE) actions. Additional studies are required to address the effect of eccentric action (EA) velocities on the pathways related to muscle hypertrophy.
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Fan J, Yang X, Li J, Shu Z, Dai J, Liu X, Li B, Jia S, Kou X, Yang Y, Chen N. Spermidine coupled with exercise rescues skeletal muscle atrophy from D-gal-induced aging rats through enhanced autophagy and reduced apoptosis via AMPK-FOXO3a signal pathway. Oncotarget 2017; 8:17475-17490. [PMID: 28407698 PMCID: PMC5392263 DOI: 10.18632/oncotarget.15728] [Citation(s) in RCA: 118] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Accepted: 02/06/2017] [Indexed: 12/20/2022] Open
Abstract
The quality control of skeletal muscle is a continuous requirement throughout the lifetime, although its functions and quality present as a declining trend during aging process. Dysfunctional or deficient autophagy and excessive apoptosis may contribute to the atrophy of senescent skeletal muscle. Spermidine, as a natural polyamine, can be involved in important cellular functions for lifespan extension and stress resistance in several model organisms through activating autophagy. Similarly, cellular autophagic responses to exercise have also been extensively investigated. In the present study, in order to confirm the mitigation or amelioration of skeletal muscle atrophy in aging rats through spermidine coupled with exercise intervention and explore corresponding mechanisms, the rat model with aging-related atrophy of skeletal muscle was established by intraperitoneal injection of D-galactose (D-gal) (200 mg/kgd), and model rats were subjected to the intervention with spermidine (5 mg/kgd) or swimming (60 min/d, 5 d/wk) or combination for 42 days. Spermidine coupled with exercise could attenuate D-gal-induced aging-related atrophy of skeletal muscle through induced autophagy and reduced apoptosis with characteristics of more autophagosomes, activated mitophagy, enhanced mitochondrial quality, alleviated cell shrinkage, and less swollen mitochondria under transmission scanning microscopic observation. Meanwhile, spermidine coupled with exercise could induce autophagy through activating AMPK-FOXO3a signal pathway with characterization of increased Beclin1 and LC3-II/LC3-I ratio, up-regulated anti-apoptotic Bcl-2, down-regulated pro-apoptotic Bax and caspase-3, as well as activated AMPK and FOXO3a. Therefore, spermidine combined with exercise can execute the prevention or treatment of D-gal-induced aging-related skeletal muscle atrophy through enhanced autophagy and reduced apoptosis mediated by AMPK-FOXO3a signal pathway.
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Affiliation(s)
- Jingjing Fan
- Hubei Key Laboratory of Exercise Training and Monitoring, Hubei Provincial Collaborative Innovation Center for Exercise and Health Promotion, College of Health Science, Wuhan Sports University, Wuhan, China
| | - Xiaoqi Yang
- Graduate School, Wuhan Sports University, Wuhan, China
| | - Jie Li
- Graduate School, Wuhan Sports University, Wuhan, China
| | - Ziyang Shu
- Graduate School, Wuhan Sports University, Wuhan, China
| | - Jun Dai
- Graduate School, Wuhan Sports University, Wuhan, China
| | - Xingran Liu
- Graduate School, Wuhan Sports University, Wuhan, China
| | - Biao Li
- Graduate School, Jilin Sport University, Changchun, China
| | - Shaohui Jia
- Hubei Key Laboratory of Exercise Training and Monitoring, Hubei Provincial Collaborative Innovation Center for Exercise and Health Promotion, College of Health Science, Wuhan Sports University, Wuhan, China
| | - Xianjuan Kou
- Hubei Key Laboratory of Exercise Training and Monitoring, Hubei Provincial Collaborative Innovation Center for Exercise and Health Promotion, College of Health Science, Wuhan Sports University, Wuhan, China
| | - Yi Yang
- Hubei Key Laboratory of Exercise Training and Monitoring, Hubei Provincial Collaborative Innovation Center for Exercise and Health Promotion, College of Health Science, Wuhan Sports University, Wuhan, China
| | - Ning Chen
- Hubei Key Laboratory of Exercise Training and Monitoring, Hubei Provincial Collaborative Innovation Center for Exercise and Health Promotion, College of Health Science, Wuhan Sports University, Wuhan, China
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Yang T, Liu H, Zhao B, Xia Z, Zhang Y, Zhang D, Li M, Cao Y, Zhang Z, Bi Y, Wang C. Wogonin enhances intracellular adiponectin levels and suppresses adiponectin secretion in 3T3-L1 adipocytes. Endocr J 2017; 64:15-26. [PMID: 27667474 DOI: 10.1507/endocrj.ej16-0158] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
As an insulin sensitizer and modulator of inflammatory responses, adiponectin has become a therapeutic target for insulin resistance, diabetes, and diabetes-related complications. Wogonin possesses anti-oxidative, anti-inflammatory, and anti-diabetic abilities. However, its effect on generation and secretion of adiponectin is ill-defined in adipocytes. Here, we demonstrated that wogonin administration augmented intracellular adiponectin levels and attenuated adiponectin release in a dose- and time-dependent manner in mature 3T3-L1 adipocytes, along with a suppression of PKCδ phosphorylation. Wogonin treatment also prevented PKCδ overexpression-induced reduction of intracellular adiponectin levels and enhancement of adiponectin release. In addition, wogonin supplementation dramatically increased AMPK phosphorylation and SirT1 expression. Inhibition of either AMPK or SirT1 mitigated wogonin action on adiponectin production and release. Furthermore, inhibition of AMPK by its specific inhibitor markedly reduced wogonin-enhanced mRNA and protein expressions of SirT1. These results suggested that wogonin regulated expression and secretion of adiponectin via PKCδ/AMPK/SirT1 signaling pathway in mature 3T3-L1 adipocytes.
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Affiliation(s)
- Tan Yang
- Department of Occupational and Environmental Health, Wuhan University School of Public Health, Wuhan 430071, China
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Liu Y, Wang X, Leng W, Pi D, Tu Z, Zhu H, Shi H, Li S, Hou Y, Hu CAA. Aspartate inhibits LPS-induced MAFbx and MuRF1 expression in skeletal muscle in weaned pigs by regulating Akt, AMPKα and FOXO1. Innate Immun 2016; 23:34-43. [PMID: 28064564 DOI: 10.1177/1753425916673443] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Infection and inflammation can result in the rapid loss of muscle mass and myofibrillar proteins (muscle atrophy). In addition, aspartate (Asp) is necessary for protein synthesis in mammalian cells. We hypothesized that Asp could attenuate LPS-induced muscle atrophy in a piglet model. Twenty-four weaning piglets were allotted to four treatments, including non-challenged control, LPS challenged control, LPS+0.5% Asp and LPS+1.0% Asp. On d 21, the piglets were injected with i.p. injection of LPS (100 ug/kg BM) or saline. At 4 h post-injection, blood, gastrocnemius and longissimus dorsi muscles samples were collected for biochemical and molecular analyses. Asp decreased the concentrations of cortisol and glucagon in plasma. In addition, Asp increased protein and RNA contents in muscles, and decreased mRNA expression of muscle atrophy F-box (MAFbx) and muscle RING finger 1 (MuRF1). Moreover, Asp decreased phosphorylation of AMPKα but increased phosphorylation of Akt and Forkhead Box O (FOXO) 1 in the muscles. Our results indicate that Asp suppresses LPS-induced MAFbx and MuRF1 expression via activation of Akt signaling, and inhibition of AMPKα and FOXO1 signaling.
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Affiliation(s)
- Yulan Liu
- 1 Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, Wuhan, People's Republic of China
| | - Xiuying Wang
- 1 Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, Wuhan, People's Republic of China
| | - Weibo Leng
- 1 Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, Wuhan, People's Republic of China
| | - Dingan Pi
- 1 Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, Wuhan, People's Republic of China
| | - Zhixiao Tu
- 1 Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, Wuhan, People's Republic of China
| | - Huiling Zhu
- 1 Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, Wuhan, People's Republic of China
| | - Haifeng Shi
- 1 Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, Wuhan, People's Republic of China
| | - Shuang Li
- 1 Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, Wuhan, People's Republic of China
| | - Yongqing Hou
- 1 Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, Wuhan, People's Republic of China
| | - Chien-An Andy Hu
- 1 Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, Wuhan, People's Republic of China
- 2 Department of Biochemistry and Molecular Biology, University of New Mexico School of Medicine, Albuquerque, NM 87131, USA
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Chen J, Ge J, Guo B, Gao K, Ma PX. Nanofibrous polylactide composite scaffolds with electroactivity and sustained release capacity for tissue engineering. J Mater Chem B 2016; 4:2477-2485. [DOI: 10.1039/c5tb02703a] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A conveniently fabricated electroactive nanofibrous composite scaffold serves as a sustained drug release system and promotes myoblast differentiation.
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Affiliation(s)
- Jing Chen
- Frontier Institute of Science and Technology, and State Key Laboratory for Mechanical Behavior of Materials
- Xi'an Jiaotong University
- Xi'an
- China
- Xi'an Modern Chemistry Research Institute
| | - Juan Ge
- Frontier Institute of Science and Technology, and State Key Laboratory for Mechanical Behavior of Materials
- Xi'an Jiaotong University
- Xi'an
- China
| | - Baolin Guo
- Frontier Institute of Science and Technology, and State Key Laboratory for Mechanical Behavior of Materials
- Xi'an Jiaotong University
- Xi'an
- China
| | - Kun Gao
- State Key Laboratory for Manufacturing Engineering
- Xi'an Jiaotong University
- Xi'an
- China
| | - Peter X. Ma
- Frontier Institute of Science and Technology, and State Key Laboratory for Mechanical Behavior of Materials
- Xi'an Jiaotong University
- Xi'an
- China
- Department of Biomedical Engineering
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