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相关概念视频

Bone Disorders01:29

Bone Disorders

3.4K
Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
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Bone Remodeling01:40

Bone Remodeling

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Hormones and Bone Tissue01:17

Hormones and Bone Tissue

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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
2.6K
Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

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Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during...
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Role of Vitamins in Maintaining Bone Health01:25

Role of Vitamins in Maintaining Bone Health

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The growth and maintenance of bone are regulated by a combination of nutritional factors, including vitamins, such as vitamin A, B12, C, D, and K.
Vitamin A
Vitamin A is involved in the process of bone remodeling. Retinoic acid, the active metabolite of Vitamin A, has nuclear receptors in osteoblasts and osteoclasts, which are involved in bone remodeling.
Vitamin B12
Vitamin B12 acts as a cofactor during the formation of osteoblast-related proteins, such as osteocalcin. Vitamin B12 plays a role...
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相关实验视频

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Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts
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在基本战斗训练期间血清骨代谢标志物变化和骨微型结构变化之间的关联 - ARMI研究

Jennifer C Coulombe1, Brittany N Bozzini2, Katelyn I Guerriere2

  • 1U.S. Army Research Institute of Environmental Medicine, Natick, MA, USA; Center for Advanced Orthopedic Studies, Beth Israel Deaconess Medical Center and Department of Orthopedic Surgery, Harvard Medical School, Boston, MA, USA.

Bone
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概括

基本战斗训练 (BCT) 增加了骨形成标志物PINP,特别是在前四周. 在接受BCT的士兵中,较高的PINP水平与改善的骨矿物质密度和结构相关.

关键词:
骨头的周转率 骨头的周转率这是CTX CTX CTX.人力资源-pQCTCT 在微型架构的微型架构一个PINP,一个PINP.士兵们的士兵们的士兵们

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相关实验视频

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科学领域:

  • 整形外科 整形外科 整形外科
  • 运动医学 运动医学
  • 骨生物学 骨生物学 骨生物学

背景情况:

  • 美国陆军的基本作战训练 (BCT) 在大多数士兵中提高了骨矿物质密度 (BMD) 和结构.
  • 很少有研究探讨了血清骨生物标志物与BCT期间骨变化之间的关联.

研究的目的:

  • 在BCT期间表征血清骨生物标记物的变化.
  • 为了研究这些生物标志物变化和骨骨质量和骨结构的变化之间的关系.

主要方法:

  • 在10周的BCT中,对235名美国陆军学员进行了前性观察研究.
  • 每周收集血液样本以测量Procollagen类型1 N-终端 (PINP) 和C-终端端1型 (CTX) 每两周一次.
  • 在基线和BCT后使用双能量X射线吸收度和高分辨率的外围定量计算断层扫描来评估腿骨骨质量,结构和微观架构.

主要成果:

  • 在女性受训者中,PINP在BCT期间和之后显著增加,在第四周达到峰值 (45.4%).
  • 男性受训者在第二周和第四周也显示PINP增加 (分别为21.9%和35.9%),在多个时间点观察到CTX下降.
  • 从基线到第四周的PINP变化与BCT后的骨BMD,骨结构和微观架构的改善正相关.

结论:

  • 骨形成标记物PINP在美国陆军BCT期间显著增加,最显著的增加发生在最初的四周.
  • 在BCT期间PINP水平升高与骨矿物质密度增加和结构改善有关.
  • 骨再吸收标记CTX的变化与这一队列的骨改善没有显著相关.