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相关概念视频

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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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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Bone Formation by Endochondral Ossification01:24

Bone Formation by Endochondral Ossification

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Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...
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Masonry in Cold and Hot Weather Conditions01:21

Masonry in Cold and Hot Weather Conditions

69
In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units...
69
Bone Disorders01:29

Bone Disorders

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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 Structure01:55

Bone Structure

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Within the skeletal system, the structure of a bone, or osseous tissue, can be exemplified in a long bone, like the femur, where there are two types of osseous tissue: cortical and cancellous.
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相关实验视频

Updated: May 15, 2025

Author Spotlight: Comparing Alveolar and Long Bone Remodeling to Explore OTM Model Potential
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Author Spotlight: Comparing Alveolar and Long Bone Remodeling to Explore OTM Model Potential

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在寒冷环境下骨建模和改造

Leyi Xue1, Qiao Guan2, Lingli Zhang1

  • 1College of Athletic Performance, Shanghai University of Sport, Shanghai 200438, China.

Biomolecules
|April 30, 2025
PubMed
概括
此摘要是机器生成的。

寒冷的环境对骨健康产生负面影响,影响骨结构,密度和细胞功能. 这项研究详细介绍了寒冷暴露如何影响骨重塑和骨微环境.

关键词:
骨头 骨头 骨头 骨头骨脂肪 骨脂肪是指骨脂肪的部分.骨微环境是一个微环境.骨血管性 骨血管性 骨血管性寒冷的环境 寒冷的环境

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科学领域:

  • 骨生物学 骨生物学 骨生物学
  • 骨生理学 骨生理学
  • 环境医学 环境医学

背景情况:

  • 寒冷的环境对寒冷的气候,极地地区和冬季运动中的个人构成风险.
  • 了解在寒冷条件下骨重塑对于预防骨问题至关重要.

研究的目的:

  • 研究寒冷环境对骨结构,质量,生物力学和骨微环境的影响.
  • 为了阐明细胞和分子机制背后的寒冷诱导的骨变化.

主要方法:

  • 对寒冷暴露和骨生理学的现有文献的审查.
  • 对细胞反应的分析,包括骨髓介质干细胞 (BMSCs) 和骨质母细胞 (OBs).
  • 检查分子通路 (例如,p38 MAPK,VEGF) 和系统因素 (例如,交感神经,瘦素).

主要成果:

  • 暴露于寒冷会减少骨的长度,厚度和骨矿物密度 (BMD),导致骨质流失.
  • 感冒会影响BMSCs的增殖和骨质分化,改变OBs和内皮细胞 (ECs),并影响骨髓脂肪组织 (MAT).
  • 感冒通过PDGF-BB,SLIT3,Notch和VEGF等因素抑制血管生成和骨生长,同时可能增加骨再吸收.

结论:

  • 寒冷的环境会导致骨的有害变化,包括骨的形成减少和再吸收增加.
  • 分子通路和骨微环境受到寒冷暴露的显著影响.
  • 需要进一步的研究来了解和减轻与寒冷相关的骨损伤.