兰克尔通过c-Fos依赖的干扰素-β诱导维持骨质平衡
Hiroshi Takayanagi1, Sunhwa Kim, Koichi Matsuo
1Department of Immunology, Faculty of Medicine and Graduate School of Medicine, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan.
Nature
|April 19, 2002
概括
NF-kappaB连接体 (RANKL) 的受体激活剂在骨质细胞前体中诱导干扰素-β (IFN-β). 然后,这种IFN-β抑制了骨质细胞分化,揭示了骨质稳定的一种新型调节途径.
科学领域:
- 细胞生物学 细胞生物学
- 免疫学 免疫学 免疫学
- 骨生物学 骨生物学 骨生物学
背景情况:
- 由单细胞/巨细胞衍生出来的骨质细胞对于骨再吸收至关重要.
- RANKL (NF-kappaB连接体的受体激活器) 信号传递对于骨质细胞分化和骨质稳定至关重要.
- 连接RANKL信号与细胞内通路的调节机制在很大程度上是未知的.
研究的目的:
- 研究RANKL信号在骨质细胞分化中的潜在细胞内调节机制.
- 阐明干扰素-β (IFN-β) 在RANKL诱导的骨质结晶发生的作用.
主要方法:
- 分析骨质细胞前体细胞中的基因表达.
- 研究IFN-β对RANKL诱导差异化的影响.
- 使用缺少IFN-β信号的小鼠模型.
主要成果:
- 在骨质细胞前体细胞中,RANKL诱导了干扰素β (IFNβ) 基因.
- 通过干扰c-Fos表达,一个关键的转录因子,IFN-β抑制骨质细胞分化.
- IFN-β的诱导依赖于c-Fos,表明一个自我调节循环.
- 缺乏IFN-β信号传递的小鼠表现为骨质疏松症和骨质结晶形成的增加.
结论:
- 一种新的自我调节机制存在,其中RANKL诱导的c-Fos可提高自身抑制剂IFN-beta的调节.
- 这种IFN-β介导的通路对于维持骨质平衡至关重要.
- 这些发现表明,骨质疏松症等骨疾病的潜在治疗点.
相关概念视频
Bone Remodeling
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.
NF-κB-dependent Signaling Pathway
The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
Osteoclasts in Bone Remodeling
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 bone...
Hormones and Bone Tissue
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...
Skeleton and Calcium Homeostasis
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.
Bone Remodeling and Repair
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 bone...


