Role of Hypoxia Inducible Factor-1α (HIF-1α) in Skeletal Muscle Aging
试验速览
- 阶段
- 不适用
- 发起方
- 入组人数
- 16
- 主要终点
- Evaluation of HIF-1a expression levels in satellite cells isolated from sarcopenic and young
研究概览
简要总结
Deficits in skeletal muscle function exist during aging and muscular dystrophy, and suboptimal function has been related to factors such as atrophy, excessive inflammation and fibrosis. Sarcopenia is the age-related loss of skeletal muscle mass and function. It is now recognised as a major clinical problem for older people and research in the area is expanding exponentially. This interest stems from the fact that sarcopenia is both common and associated with serious health consequences in terms of frailty, disability, morbidity and mortality. The age-related loss of human skeletal muscle mass is due to a decrease in myofibre size and number with the loss of both fast and slow type myofibres, although the loss of fast myofibres tends to start earlier, at ∼70 years. Many factors influence the decrease in muscle mass. A significant contributor is an anabolic resistance of older skeletal muscle to protein nutrition as seen during immobilisation which can be ameliorated at least in part by resistance exercise and dietary supplementation. Other intensive areas of research are related to the loss of innervation and oxidative damage. Moreover, ineffective muscle regeneration underlies each condition and has been attributed to a deficit in myogenic potential of resident stem cells or satellite cells. It is now widely accepted that satellite cells, and generally adult stem cells, are normally quiescent and tend to reside in hypoxic areas of the tissue to preserve their undifferentiated state. To govern these processes, cells have developed a very complex machinery that is mainly regulated by a group of transcription factors known as hypoxia-inducible factors (HIFs). In particular, several observations support the idea that oxygen deprivation and HIF-1a may play a key role during ischemia to activate the regeneration process, which, after an initial hypoxic insult, needs to proceed under normoxia. On these bases, in this study we will investigate the role of HIF-1a in skeletal atrophy during aging.
详细描述
Deficits in skeletal muscle function exist during aging and muscular dystrophy, and suboptimal function has been related to factors such as atrophy, excessive inflammation and fibrosis. Sarcopenia is the age-related loss of skeletal muscle mass and function. It is now recognised as a major clinical problem for older people and research in the area is expanding exponentially. This interest stems from the fact that sarcopenia is both common and associated with serious health consequences in terms of frailty, disability, morbidity and mortality. The age-related loss of human skeletal muscle mass is due to a decrease in myofibre size and number with the loss of both fast and slow type myofibres, although the loss of fast myofibres tends to start earlier, at ∼70 years. Many factors influence the decrease in muscle mass. A significant contributor is an anabolic resistance of older skeletal muscle to protein nutrition as seen during immobilisation which can be ameliorated at least in part by resistance exercise and dietary supplementation. Other intensive areas of research are related to the loss of innervation and oxidative damage. Moreover, ineffective muscle regeneration underlies each condition and has been attributed to a deficit in myogenic potential of resident stem cells or satellite cells. It is now widely accepted that satellite cells, and generally adult stem cells, are normally quiescent and tend to reside in hypoxic areas of the tissue to preserve their undifferentiated state. To govern these processes, cells have developed a very complex machinery that is mainly regulated by a group of transcription factors known as hypoxia-inducible factors (HIFs). In particular, several observations support the idea that oxygen deprivation and HIF-1a may play a key role during ischemia to activate the regeneration process, which, after an initial hypoxic insult, needs to proceed under normoxia. On these bases, in this study we will investigate the role of HIF-1a in skeletal atrophy during aging.
In particular, we will isolate satellite cells from muscular biopsies harvested from old sarcopenic patients and from young patients. The, we will measure HIF-1a levels and we will compare them.
研究设计
- 研究类型
- Observational
- 观察模型
- Case Control
- 时间视角
- Prospective
入排标准
- 年龄范围
- 18 Years 至 90 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Sarcopenic patients (measured by DXA) affected by hip osteoarthritis, developmental dysplasia of the hip or hip fracture and undergoing hip replacement surgery (for the sarcopenic group)
- •Patients affected by traumatic ACL tears and undergoing ACL reconstruction surgery (for the control group)
- •Patients between 18 and 35 years old (for the control group)
- •Patients between 65 and 90 years old (for the sarcopenic group)
- •18 ≤ Body Mass Index (BMI) ≤ 30 kg/m2
排除标准
- •Diseases that can affect bone or muscle metabolism
- •Pharmacological therapies that can interact with bone or muscle metabolism
- •Bone metastases
- •Bone infections
- •HIV, hepatitis B virus, hepatitis C virus or Treponema pallidum positivity
- •BMI ≥30kg/m2
结局指标
主要结局
Evaluation of HIF-1a expression levels in satellite cells isolated from sarcopenic and young
时间窗: 1 year
Western blot analysis of HIF-1a levels and of its downstream targets (Vascular Endothelial Growth Factor: VEGF, phosphoglycerate kinase: PGK, Prolylhydroxilases: PHD2)
次要结局
- Evaluation of sarcopenic profile in satellite cells harvested from old sarcopenic patients(6 months)
- Evaluation of satellite cell differentiation in cells treated with PHDs inhibitors(1 year)
- Correlation of HIF-1a levels with the degree of sarcopenia in the satellite cells of old sarcopenic patients(1 year)
- Evaluation of differences in satellite cells number between young and old patients(6 months)
- Evaluation of HIF-1a stabilization on satellite cells treated with PHDs inhibitors(1 year)
- Evaluation of satellite cell proliferation in cells treated with PHDs inhibitors(1 year)