骨细胞中的Gsα缺乏会改变面生长和乳矿化
Khalid A Abalkhail1,2,3,4, Melih Motro5, Alpdogan Kantarci6,7
1Department of Translational Dental Medicine, Henry M. Goldman School of Dental Medicine, Boston University, Boston, Massachusetts, USA.
Orthodontics & craniofacial research
|November 26, 2025
概括
在骨细胞中缺乏G蛋白刺激子单元α (Gsα) 的小鼠表现出严重的骨质疏松症和减少牙矿化. 这项研究调查了这些缺乏Gsα的小鼠的面和牙特征.
科学领域:
- 骨生物学 骨生物学 骨生物学
- 骨的发育 骨的发育
- 在 GPCR 信号传输中.
背景情况:
- 骨细胞表达了众多的G蛋白结合受体 (GPCR).
- 在骨细胞 (DMP1-GsαKO) 中缺乏G蛋白刺激子单元α (Gsα) 的小鼠表现出严重的骨质疏松症.
- 以前的研究将这种骨质疏松症与增加的硬质素表达联系起来,抑制骨质细胞功能.
研究的目的:
- 分析DMP1-GsαKO小鼠的面和牙特征.
- 了解Gsα信号传递在骨细胞,成熟骨质母细胞和牙母细胞中在维持骨和牙平衡中的作用.
主要方法:
- 在28只小鼠中使用DEXA对骨矿物质密度 (BMD),骨矿物质含量 (BMC) 和牙矿化量的定量评估 (控制对比DMP1-Gsα).
- 高分辨率微计算机断层扫描 (μCT) 用于下和头骨的骨微架构分析.
- 组织形态测量分析,包括耐酸酸酶 (TRAP) 染色,以评估骨质再吸收.
主要成果:
- DMP1-GsαKO小鼠表现出下 BMD,BMC,状 BMD 和牙矿化减少.
- 微CT显示,DMP1-GsαKO小鼠的状骨体积和牙矿化减少.
- 组织学证实了骨质疏松症,在DMP1-GsαKO小鼠中增加了骨质细胞数量 (TRAP阳性),表明骨质再吸收增加. 头骨和斜骨骨在对照组中较大.
结论:
- 骨细胞,成熟的骨质母细胞和牙母细胞中的Gsα信号传递对于维持正常的骨和牙平衡至关重要.
- 破坏Gsα信号传递会导致显著的骨和牙异常.
更多相关视频
05:25Author Spotlight: Comparing Alveolar and Long Bone Remodeling to Explore OTM Model Potential
Published on: July 21, 2023
1.9K
14:55Analysis of Minerals Produced by hFOB 1.19 and Saos-2 Cells Using Transmission Electron Microscopy with Energy Dispersive X-ray Microanalysis
Published on: June 24, 2018
9.6K
相关概念视频
01:31Essential Minerals for Bone Health
5.9K
The minerals contained in all of the food we consume are essential for our organ systems. However, certain essential minerals, such as calcium, phosphorus, magnesium, manganese, and fluoride, largely affect bone health.
Calcium and Phosphorus
Calcium is a critical component of bones, especially in the form of calcium phosphate and calcium carbonate. Since the body cannot make calcium, it must be obtained from the diet. However, calcium cannot be absorbed from the small intestine without...
Calcium and Phosphorus
Calcium is a critical component of bones, especially in the form of calcium phosphate and calcium carbonate. Since the body cannot make calcium, it must be obtained from the diet. However, calcium cannot be absorbed from the small intestine without...
5.9K
01:29Bone Disorders
5.0K
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...
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...
5.0K
01:17Hormones and Bone Tissue
3.6K
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...
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...
3.6K
01:22Activation and Inactivation of G Proteins
10.7K
Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high...
10.7K
01:29Bone Formation by Intramembranous Ossification
10.0K
Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into ...
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into ...
10.0K
01:27Growth of Cartilage and Bone Tissue
4.0K
Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
4.0K