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The reduced contraction capacity of palatopharyngeal muscle in OSAHS is related to the decreased intra-cellular [Ca2+] mediated by low RyR1 and DHPRα1s expression. Sleep Breath 2022; 26:1791-1799. [DOI: 10.1007/s11325-022-02562-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 12/31/2021] [Accepted: 01/05/2022] [Indexed: 11/27/2022]
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Zhang J, Liu H, Li S, Wu J, Sun J. SERCA1 attenuates diaphragm relaxation and uptake rate of SERCA in rats with acute sepsis. Mol Med Rep 2017; 16:5015-5022. [PMID: 28765908 DOI: 10.3892/mmr.2017.7134] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 06/15/2017] [Indexed: 11/06/2022] Open
Abstract
The present study aimed to investigate the effects of acute sepsis on diaphragm contractility and relaxation, via examining the Ca2+‑uptake function of sarco/endoplasmic reticulum Ca2+ adenosine triphosphatase (SERCA), and the protein levels of SERCA1, SERCA2 and the ryanodine receptor (RyR) of the sarcoplasmic reticulum (SR). A sepsis rat model was established through cecal ligation and puncture (CLP). A total of 6 and 12 h following CLP, the isometric contractile and relaxation parameters of the diaphragm were measured. In addition, Ca2+ uptake and release from the SR, and the protein expression levels of SERCA1, SERCA2 and RyR in diaphragm muscle tissue were investigated. At 6 and 12 h post‑CLP, the diaphragm half‑relaxation time was prolonged and the maximum rate of tension decline was decreased and the Ca2+‑uptake function of SERCA was markedly reduced. The maximum rate of twitch force development, the maximal twitch and tetanic tension, and the release function of SR were decreased at 12 h post‑CLP. A total of 12 h following CLP, the protein expression levels of SERCA1 were significantly downregulated, and its activity was significantly reduced; conversely, the protein levels of SERCA2 remained unaltered. The present findings indicated that at the acute stage of sepsis induced by CLP the contractile and relaxation functions of the diaphragm were significantly compromised. The impairments in relaxation may be a result of the impaired uptake function of the SR and the downregulation in SERCA1 protein expression. Conversely, the compromised contractility may be a result of the impaired release function of the SR and the downregulation in RyR protein levels. This could provide some new insights into the treatment of sepsis. In acute stages of sepsis, the improvement of SERCA function could reduce the disequilibrium of calcium homeostasis to improve the critical illness myopathy and respiratory failure.
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Affiliation(s)
- Jianyou Zhang
- Department of Anesthesiology, The Affiliated Hospital of Yangzhou University, Yangzhou University, Yangzhou, Jiangsu 225000, P.R. China
| | - Hui Liu
- Department of Endocrinology, The Affiliated Hospital of Yangzhou University, Yangzhou University, Yangzhou, Jiangsu 225000, P.R. China
| | - Shitong Li
- Department of Anesthesiology, Shanghai General Hospital of Nanjing Medical University, Shanghai 200080, P.R. China
| | - Jin Wu
- Department of Anesthesiology, Shanghai General Hospital of Nanjing Medical University, Shanghai 200080, P.R. China
| | - Jianhong Sun
- Department of Anesthesiology, The Affiliated Hospital of Yangzhou University, Yangzhou University, Yangzhou, Jiangsu 225000, P.R. China
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Wang MM, Hao LY, Guo F, Zhong B, Zhong XM, Yuan J, Hao YF, Zhao S, Sun XF, Lei M, Jiao GY. Decreased intracellular [Ca 2+ ] coincides with reduced expression of Dhprα1s, RyR1, and diaphragmatic dysfunction in a rat model of sepsis. Muscle Nerve 2017; 56:1128-1136. [PMID: 28044347 DOI: 10.1002/mus.25554] [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] [Accepted: 12/30/2016] [Indexed: 12/23/2022]
Abstract
INTRODUCTION Sepsis can cause decreased diaphragmatic contractility. Intracellular calcium as a second messenger is central to diaphragmatic contractility. However, changes in intracellular calcium concentration ([Ca2+ ]) and the distribution and co-localization of relevant calcium channels [dihydropyridine receptors, (DHPRα1s) and ryanodine receptors (RyR1)] remain unclear during sepsis. In this study we investigated the effect of changed intracellular [Ca2+ ] and expression and distribution of DHPRα1s and RyR1 on diaphragm function during sepsis. METHODS We measured diaphragm contractility and isolated diaphragm muscle cells in a rat model of sepsis. The distribution and co-localization of DHPRα1s and RyR1 were determined using immunohistochemistry and immunofluorescence, whereas intracellular [Ca2+ ] was measured by confocal microscopy and fluorescence spectrophotometry. RESULTS Septic rat diaphragm contractility, expression of DHPRα1s and RyR1, and intracellular [Ca2+ ] were significantly decreased in the rat sepsis model compared with controls. DISCUSSION Decreased intracellular [Ca2+ ] coincides with diaphragmatic contractility and decreased expression of DHPRα1s and RyR1 in sepsis. Muscle Nerve 56: 1128-1136, 2017.
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Affiliation(s)
- Meng-Meng Wang
- Department of Respiratory and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, Postal Code 110004, People's Republic of China
| | - Li-Ying Hao
- Department of Pharmaceutical Toxicology, School of Pharmaceutical Sciences, China Medical University, Shenyang, People's Republic of China
| | - Feng Guo
- Department of Pharmaceutical Toxicology, School of Pharmaceutical Sciences, China Medical University, Shenyang, People's Republic of China
| | - Bin Zhong
- Department of Respiratory Medicine, The First Affiliated Hospital of Gannan Medical University, Ganzhou, Jiangxi Province, People's Republic of China
| | - Xiao-Mei Zhong
- Department of Respiratory and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, Postal Code 110004, People's Republic of China
| | - Jing Yuan
- Department of Respiratory and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, Postal Code 110004, People's Republic of China
| | - Yi-Fei Hao
- Department of Orthopedic Surgery, Shengjing Hospital of China Medical University, Shenyang, People's Republic of China
| | - Shuang Zhao
- Department of Respiratory and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, Postal Code 110004, People's Republic of China
| | - Xue-Fei Sun
- Department of Pharmaceutical Toxicology, School of Pharmaceutical Sciences, China Medical University, Shenyang, People's Republic of China
| | - Ming Lei
- Department of Pharmaceutical Toxicology, School of Pharmaceutical Sciences, China Medical University, Shenyang, People's Republic of China
| | - Guang-Yu Jiao
- Department of Respiratory and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, Postal Code 110004, People's Republic of China
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Jiao G, Hao L, Wang M, Zhong B, Yu M, Zhao S, Wang P, Feng R, Tan S, Chen L. Upregulation of endoplasmic reticulum stress is associated with diaphragm contractile dysfunction in a rat model of sepsis. Mol Med Rep 2016; 15:366-374. [PMID: 27959404 DOI: 10.3892/mmr.2016.6014] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2015] [Accepted: 11/02/2016] [Indexed: 11/06/2022] Open
Abstract
Sepsis often causes diaphragm contractile dysfunction. Endoplasmic reticulum (ER) stress has been implicated in muscle contractile dysfunction. However, it remains unknown if ER stress occurs in the diaphragm during sepsis. In the present study, rats were divided into 4 groups and received placebo or one of three durations of endotoxin treatment (24, 48 h and 7 days). Isometric contractile force of the diaphragm was measured and lung wet-to-dry ratio (W/D) was calculated. Hematoxylin and eosin (H&E) staining of lung tissue was performed and electron microscopy assessed ER damage in the diaphragm during sepsis. The mRNA and protein expression of glucose‑regulated protein 78 kDa (GRP78), glucose-regulated protein 94 kDa (GRP94), C/EBP homologous protein (CHOP), endoplasmic reticulum protein 44 (ERP44), protein disulfide-isomerase like protein (ERP57) and protein disulfide isomerase family A member 4 (ERP72) in diaphragm muscles were measured using reverse transcription‑quantitative polymerase chain reaction and western blot analysis. The level of cleaved caspase-12 was analyzed by western blot analysis. The results demonstrated that sepsis increased lung W/D. H&E staining revealed that sepsis caused alveolar congestion, hemorrhage and rupture. Swollen and distended ER was observed using electron microscopy during sepsis and decreased diaphragm contractile function was also observed. The expression levels of ER stress markers (GRP78, GRP94, CHOP, ERP44, ERP57 and ERP72) and the level of cleaved caspase‑12 were significantly elevated in septic rats compared with control rats, particularly in the 48 h group. In conclusion, the present study indicated that weakened diaphragm contraction and damaged ER in septic rats was associated with increased expression of ER stress markers.
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Affiliation(s)
- Guangyu Jiao
- Respiratory Department and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Liying Hao
- Department of Pharmaceutical Toxicology, School of Pharmaceutical Sciences, China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Mengmeng Wang
- Respiratory Department and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Bin Zhong
- Respiratory Department and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Miao Yu
- Respiratory Department and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Shuang Zhao
- Respiratory Department and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Pingping Wang
- Respiratory Department and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Rui Feng
- Department of Pharmaceutical Toxicology, School of Pharmaceutical Sciences, China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Shutao Tan
- Respiratory Department and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Liu Chen
- Respiratory Department and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
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Wu J, Zhang JY, Gong Y, Li ST. Slowed relaxation of diaphragm in septic rats is associated with reduced expression of sarco-endoplasmic reticulum CA2+-ATPase genesSERCA1andSERCA2. Muscle Nerve 2016; 54:1108-1113. [PMID: 27104787 DOI: 10.1002/mus.25150] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/13/2016] [Indexed: 01/02/2023]
Affiliation(s)
- Jin Wu
- Department of Anesthesiology, First People's Hospital, School of Medicine; Shanghai Jiaotong University; 100 Hai Ning Road Shanghai 20080 China
| | - Jian You Zhang
- Department of Anesthesiology, First People's Hospital, School of Medicine; Shanghai Jiaotong University; 100 Hai Ning Road Shanghai 20080 China
| | - Yuan Gong
- Department of Anesthesiology, First People's Hospital, School of Medicine; Shanghai Jiaotong University; 100 Hai Ning Road Shanghai 20080 China
| | - Shi Tong Li
- Department of Anesthesiology, First People's Hospital, School of Medicine; Shanghai Jiaotong University; 100 Hai Ning Road Shanghai 20080 China
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Jiao GY, Hao LY, Chen L, Gao CE, Feng R, Hu HY, Tan ST, Wang MM, Zhong B, Wang PP. High levels of positive end-expiratory pressure preserve diaphragmatic contractility during acute respiratory distress syndrome in rats. Exp Physiol 2016; 100:967-76. [PMID: 26053378 DOI: 10.1113/ep085083] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2015] [Accepted: 06/02/2015] [Indexed: 11/08/2022]
Abstract
NEW FINDINGS What is the central question of this study? Higher levels of positive end-expiratory pressure (PEEP) have recently been used in patients with acute respiratory distress syndrome (ARDS). In normal physiological conditions, the ability of the diaphragm to generate pressure is reduced when the lung volume is elevated beyond its functional residual capacity. It is unknown whether higher levels of PEEP will have a negative impact on diaphragmatic contraction in the presence of the pathophysiology of ARDS. What is the main finding and its importance? Mechanical ventilation with higher levels of PEEP reduced lung injury, improved diaphragmatic contractility and increased the expression of both dihydropyridine receptor and ryanodine receptor in the diaphragms of rats with ARDS. Higher levels of positive end-expiratory pressure (PEEP) have recently been used in patients with acute respiratory distress syndrome (ARDS). In normal physiological conditions, the ability of the diaphragm to generate pressure is reduced when the lung volume is elevated beyond its functional residual capacity. Thus, it is critical to understand whether higher levels of PEEP will have a negative impact on diaphragmatic contraction in the presence of the pathophysiology of ARDS. This study was designed to determine whether higher levels of PEEP reduce diaphragmatic contractility in a rat model of ARDS generated using i.p. lipopolysaccharide. Forty rats were randomly assigned to the following five groups: a control group with no special treatment; an ARDS group with no mechanical ventilation; and three ARDS groups with mechanical ventilation with PEEP at 0, 5 or 10 cmH2 O, respectively. We found that mechanical ventilation with PEEP reduced lung injury, improved diaphragmatic contractility and increased the expression of both dihydropyridine receptor and ryanodine receptor in the diaphragms of rats with ARDS. These changes were most significant at a PEEP of 10 cmH2 O among all applied levels of PEEP. In conclusion, using a rat ARDS model, this study confirmed that diaphragmatic contractility was preserved by mechanical ventilation with high levels of PEEP.
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Affiliation(s)
- Guang-Yu Jiao
- Respiratory Department and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, People's Republic of China
| | - Li-Ying Hao
- Department of Pharmaceutical Toxicology, School of Pharmaceutical Sciences, China Medical University, Shenyang, People's Republic of China
| | - Lie Chen
- Respiratory Department and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, People's Republic of China
| | - Chun-E Gao
- Respiratory Department and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, People's Republic of China
| | - Rui Feng
- Department of Pharmaceutical Toxicology, School of Pharmaceutical Sciences, China Medical University, Shenyang, People's Republic of China
| | - Hui-Yuan Hu
- Department of Pharmaceutical Toxicology, School of Pharmaceutical Sciences, China Medical University, Shenyang, People's Republic of China
| | - Shu-Tao Tan
- Respiratory Department and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, People's Republic of China
| | - Meng-Meng Wang
- Respiratory Department and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, People's Republic of China
| | - Bin Zhong
- Respiratory Department and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, People's Republic of China
| | - Ping-Ping Wang
- Respiratory Department and Intensive Care Unit, Shengjing Hospital of China Medical University, Shenyang, People's Republic of China
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Abstract
PURPOSE OF REVIEW Survivors of a critical illness may experience poor physical function and quality of life as a result of reduced skeletal muscle mass and strength during their acute illness. Patients diagnosed with sepsis are particularly at risk, and mechanical ventilation may result in diaphragm dysfunction. Interest in the interaction of these conditions is both growing and important to understand for individualized patient care. RECENT FINDINGS This review describes developments in the presentation of both diaphragm and limb myopathy in critical illness, as measured from muscle biopsy and at the bedside with various imaging and strength-testing modalities. The influence of unloading of the diaphragm with mechanical ventilation and peripheral muscles with immobilization in septic patients has been recently questioned. Systemic inflammation appears to primarily accelerate and accentuate dysfunction, which may be remedied by early mobilization and augmented with developing muscle and/or nerve stimulation techniques. SUMMARY Many acute muscle changes in septic patients are likely to stem from pre-existing impairments, which should provide context for clinical evaluations of strength. During illness, sarcolemmal injury promotes a cascade of intra-cellular abnormalities. As unique characteristics of ICU-acquired weakness and differential effects on muscle groups are understood, early diagnosis and management should be facilitated.
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Affiliation(s)
- Claire E Baldwin
- aInternational Centre for Allied Health Evidence and School of Health Sciences, University of South Australia, Adelaide bPhysiotherapy Department, Flinders Medical Centre, Bedford Park cDepartment of Critical Care Medicine, School of Medicine, Faculty of Health Sciences, Flinders University, Bedford Park dIntensive and Critical Care Unit, Flinders Medical Centre, Bedford Park, South Australia, Australia
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