成熟骨细胞中的Piezo1表达对于骨对机械负荷的反应是不可或缺的
Xuehua Li1, Connie Zhang1, Cameron E Vail2
1Department of Orthopaedic Surgery, University of Arkansas for Medical Sciences, Little Rock, AR, USA; Center for Musculoskeletal Disease Research, University of Arkansas for Medical Sciences, Little Rock, AR, USA.
Bone
|October 10, 2024
概括
成熟骨细胞中的Piezo1维持骨质量,但不需要用于机械负荷反应. 在这些细胞中删除Piezo1会减少骨密度和厚度.
科学领域:
- 骨生物学 骨生物学 骨生物学
- 机械生物学 机械生物学
- 骨生理学 骨生理学
背景情况:
- 机械负荷对骨健康和恒温至关重要.
- 骨细胞是骨组织中的关键机械传感器.
- 机械敏感的离子通道Piezo1与骨对机械刺激的反应有关.
研究的目的:
- 研究Piezo1在成熟骨细胞中的特定作用.
- 为了区分Piezo1在骨细胞中的功能与骨质母细胞和骨细胞组合的功能.
- 了解Piezo1对骨维护和机械适应的贡献.
主要方法:
- 使用Sost-Cre小鼠来实现Piezo1删除,特别是在成熟的骨细胞中.
- 对比了Sost-Cre Piezo1缺乏的小鼠与Dmp1-Cre Piezo1缺乏的小鼠的骨表型.
- 评估了骨矿物质密度,无骨质量,皮层厚度和周骨扩张.
- 在目标淘汰赛模型中对机械负荷进行骨反应的评估.
主要成果:
- 在成熟骨细胞 (Sost-Cre) 中删除Piezo1导致骨矿物质密度,无骨质量和皮层厚度降低.
- 这些小鼠也表现出骨周扩张的减少.
- 与Dmp1-Cre小鼠不同,在成熟骨细胞中具有Piezo1缺失的Sost-Cre小鼠对机械负荷做出了正常反应.
- 这表明骨细胞中的Piezo1对于基本骨维护很重要,但不是机械反应.
结论:
- 成熟骨细胞中的Piezo1在生理条件下在维持骨质量方面发挥着重要作用.
- Piezo1对于机械负荷的骨反应是不可或缺的,当从成熟的骨细胞中专门删除时.
- 这些发现突显了Piezo1在骨机械转导中的细胞类型特异性功能.
相关概念视频
01:40Bone Remodeling
38.2K
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.
38.2K
01:12Mechanically-gated Ion Channels
6.3K
Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
6.3K
01:27Compact Bone
11.2K
Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...
11.2K
01:13Cell-matrix's Response to Mechanical Forces
2.6K
In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue.
Anchoring junctions mechanically attach a cell to the...
Anchoring junctions mechanically attach a cell to the...
2.6K
01:18The Bone Matrix
3.0K
Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in...
3.0K
01:31Osteoclasts in Bone Remodeling
2.8K
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...
2.8K