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Huang H, Xie S, Gu X, Xiang B, Zhong Z, Huang P, Gao Y, Li P. Higher Circulating miR-199a-5p Indicates Poor Aerobic Exercise Capacity and Associates With Cardiovascular Dysfunction During Chronic Exposure to High Altitude. Front Physiol 2021; 12:587241. [PMID: 33633582 PMCID: PMC7900411 DOI: 10.3389/fphys.2021.587241] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Accepted: 01/07/2021] [Indexed: 12/14/2022] Open
Abstract
Background Hypoxia-induced decline in exercise capacity is ubiquitous among lowlanders who immigrated to high altitudes, which severely reduces their work efficiency and quality of life. Although studies have revealed that hypoxia-induced cardiovascular dysfunction limits exercise capacity at high altitudes, the mechanisms have not been well explored at the molecular level. miR-199a-5p is hypoxia-sensitive and serves as an important regulator in cardiovascular pathophysiology. However, whether miR-199a-5p is involved in cardiovascular dysfunction at high altitudes and contributes to subsequent reductions in exercise capacity remains unknown. Thus, this study aimed at exploring these relationships in a high altitude population. Methods A total of 175 lowlanders who had immigrated to an altitude of 3,800 m 2 years previously participated in the present study. The level of plasma miR-199a-5p and the concentration of serum myocardial enzymes were detected by qRT-PCR and ELISA, respectively. Indices of cardiovascular function were examined by echocardiography. The exercise capacity was evaluated by Cooper’s 12-min run test and the Harvard Step Test. Furthermore, we explored the biological functions of miR-199a-5p with silico analysis and a biochemical test. Results The level of miR-199a-5p was significantly higher in individuals with poor exercise capacity at 3,800 m, compared with those with good exercise capacity (p < 0.001). miR-199a-5p accurately identified individuals with poor exercise capacity (AUC = 0.752, p < 0.001). The level of miR-199a-5p was positively correlated with cardiovascular dysfunction indices (all, p < 0.001). Furthermore, miR-199a-5p was involved in the oxidative stress process. Conclusion In this study, we reported for the first time that the level of circulating miR-199a-5p was positively associated with exercise capacity during chronic hypoxia at high altitudes. Moreover, higher miR-199a-5p was involved in hypoxia-induced cardiovascular dysfunctions, thus contributing to poorer exercise endurance at high altitudes.
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Affiliation(s)
- He Huang
- Department of High Altitude Operational Medicine, College of High Altitude Military Medicine, Army Medical University (Third Military Medical University), Chongqing, China.,College of High Altitude Military Medicine, Institute of Medicine and Equipment for High Altitude Region, Army Medical University (Third Military Medical University), Chongqing, China.,Key Laboratory of Extreme Environmental Medicine, Ministry of Education of China, Chongqing, China.,Key Laboratory of High Altitude Medicine, PLA, Chongqing, China
| | - Shenwei Xie
- Shigatse Branch, Second Affiliated Hospital (Xinqiao Hospital) of Army Medical University (Third Military Medical University), Tibet, China
| | - Xiaolan Gu
- Department of Infectious Diseases, First Affiliated Hospital of Army Medical University (Third Military Medical University), Chongqing, China
| | - Bin Xiang
- Department of High Altitude Operational Medicine, College of High Altitude Military Medicine, Army Medical University (Third Military Medical University), Chongqing, China.,Key Laboratory of Extreme Environmental Medicine, Ministry of Education of China, Chongqing, China.,Key Laboratory of High Altitude Medicine, PLA, Chongqing, China
| | - Zhifeng Zhong
- Department of High Altitude Operational Medicine, College of High Altitude Military Medicine, Army Medical University (Third Military Medical University), Chongqing, China.,Key Laboratory of Extreme Environmental Medicine, Ministry of Education of China, Chongqing, China.,Key Laboratory of High Altitude Medicine, PLA, Chongqing, China
| | - Pei Huang
- Department of High Altitude Operational Medicine, College of High Altitude Military Medicine, Army Medical University (Third Military Medical University), Chongqing, China.,Key Laboratory of Extreme Environmental Medicine, Ministry of Education of China, Chongqing, China.,Key Laboratory of High Altitude Medicine, PLA, Chongqing, China
| | - Yuqi Gao
- College of High Altitude Military Medicine, Institute of Medicine and Equipment for High Altitude Region, Army Medical University (Third Military Medical University), Chongqing, China.,Key Laboratory of Extreme Environmental Medicine, Ministry of Education of China, Chongqing, China.,Key Laboratory of High Altitude Medicine, PLA, Chongqing, China
| | - Peng Li
- Department of High Altitude Operational Medicine, College of High Altitude Military Medicine, Army Medical University (Third Military Medical University), Chongqing, China.,Key Laboratory of Extreme Environmental Medicine, Ministry of Education of China, Chongqing, China.,Key Laboratory of High Altitude Medicine, PLA, Chongqing, China
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Niu M, Singh S, Mi M, Bian P, Deji Z, Mima D, Li X. Safety and Efficacy of Therapeutic Erythrocytapheresis Treatment in Chronic Mountain Sickness Patients in Shigatse, Tibet, China. Med Sci Monit 2020; 26:e927853. [PMID: 33353927 PMCID: PMC7768795 DOI: 10.12659/msm.927853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Background Therapeutic erythrocytapheresis (TEA) is a medical technology that separates erythrocytes from whole blood and has been used in various hematological conditions. However, reports on the use of TEA to treat chronic mountain sickness (CMS) are lacking. The aim of the present study was to evaluate the efficacy, safety, and use of TEA in treatment of CMS. Material/Methods A total of 32 patients living in the Shigatse area of Tibet (altitude 4000 m) who had CMS were treated with TEA. Clinical data, CMS score, Borg dyspnea score, 6-min walking test score, and NYHA classification values were collected prior to and after TEA therapy. Results TEA treatment significantly increased SpO2 (93.8±2.6 vs. 80.5±5.8%, P<0.001) and decreased red blood cell (5.77±0.70 vs. 7.48±0.67×1012/L, P<0.001), hematocrit (53.8±5.6 vs. 69.2±4.8%, P<0.001) and hemoglobin (178±16 vs. 236±14 g/L, P<0.001). Significantly lower systolic and diastolic blood pressure were also noted (P<0.001). Echocardiography showed higher left ventricle diameter (4.6±0.4 vs. 4.4±0.5 cm, P<0.01). TEA markedly decreased CMS scores (0.45±0.85 vs. 7.58±2.31, P<0.001), Borg dyspnea scale scores (0.48±0.73 vs. 0.88±0.81, P<0.001), and NYHA classification scores (P<0.05). Additionally, there was marked improvement in the 6-min walking test scores (578.5±83.1 vs. 550.4±79.0 m, P<0.001). The procedure was well tolerated, with no complications. Conclusions Our novel approach of treating CMS patients with TEA safely and effectively reduced erythrocytosis, which remains a fundamental challenge in CMS patients.
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Affiliation(s)
- Mingyuan Niu
- Department of Cardiology, Shigatse People's Hospital, Shigatse, Tibet, China (mainland)
| | - Shekhar Singh
- Department of Cardiology, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China (mainland)
| | - Ma Mi
- Department of Cardiology, Shigatse People's Hospital, Shigatse, Tibet, China (mainland)
| | - Pian Bian
- Department of Cardiology, Shigatse People's Hospital, Shigatse, Tibet, China (mainland)
| | - Zhuoga Deji
- Department of Cardiology, Shigatse People's Hospital, Shigatse, Tibet, China (mainland)
| | - Duoji Mima
- Department of Cardiology, Shigatse People's Hospital, Shigatse, Tibet, China (mainland)
| | - Xiankai Li
- Department of Cardiology, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China (mainland)
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