居住在ER中的蛋白质是软骨和骨稳定中的关键参与者
Sina Stücker1, Yvonne Rellmann1, Sandra Schulte1
1Institut of Physiological Chemistry and Pathobiochemistry, University of Münster, Münster, Germany.
Frontiers in cell and developmental biology
|November 24, 2025
概括
冠状细胞内质网膜 (ER) 中错误折叠的蛋白质会导致ER压力,扰乱软骨和骨的发育,并导致骨疾病. 了解ER居民蛋白质是软骨稳态和疾病的关键.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生物化学
- 骨生物学 骨生物学
背景情况:
- 氨酸软骨依赖于由体细胞产生的密集的细胞外基质.
- 细胞内膜网膜 (ER) 包含用于蛋白质折叠,修饰和分泌的机器.
- 对于软骨矩阵的完整性和软骨细胞的功能来说,ER蛋白质加工至关重要.
研究的目的:
- 审查常见的ER居民蛋白及其在软骨恒温中的作用.
- 阐明ER压力对骨发育和疾病的影响.
- 突出ER蛋白在维持软骨和骨健康方面的功能.
主要方法:
- 关于软骨中ER居住蛋白的文献综述.
- 对将ER压力与骨疾病联系起来的分子机制的分析.
- 综合当前关于ER蛋白在软质细胞中的功能知识.
主要成果:
- ER 陪伴者和蛋白质功能障碍导致矩阵蛋白质错误折叠和积累.
- 在ER中,压力会扰乱胆细胞的分化,信号传递和基质生产.
- 紧急救护人员的缺陷会导致骨疾病,如软骨质疏松症和骨关节炎.
结论:
- 居住在ER中的蛋白质对软骨矩阵的形成和关节功能至关重要.
- ER压力显著导致骨功能障碍和软骨退化.
- 进一步研究ER蛋白的作用对于理解和治疗软骨疾病至关重要.
相关概念视频
01:31Osteoclasts in Bone Remodeling
3.8K
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...
3.8K
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
01:18The Bone Matrix
5.4K
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...
5.4K
01:40Bone Remodeling
40.2K
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.
40.2K
01:21Skeleton and Calcium Homeostasis
5.7K
Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.
5.7K
01:21Matrix Proteoglycans and Glycoproteins
4.9K
Proteoglycans are extensively glycosylated proteins, commonly found in the extracellular matrix, interwoven with collagen fibers. Hyaline cartilage, the most common type of cartilage in the body, consists of short and dispersed collagen fibers associated with large amounts of proteoglycans. These proteoglycans have long negative charges that attract cations, which in turn attract water molecules. This influx of ions and water molecules swells up the proteoglycan like a water-soaked gel that can...
4.9K