脂酶Cβ4通过与MKK3和p38 MAPK相互作用,促进RANKL依赖的骨质结晶发生
Dong-Kyo Lee1, Xian Jin1, Poo-Reum Choi1
1Department of Biochemistry and Cell Biology, Cell and Matrix Research Institute, School of Medicine, Kyungpook National University, Daegu, Republic of Korea.
Experimental & molecular medicine
|February 2, 2025
概括
脂酶Cβ4 (PLCβ4) 对于骨质细胞分化至关重要. 在小鼠中缺少它会减少骨质细胞的形成并增加骨质量,这表明PLCβ4是骨疾病的治疗点.
科学领域:
- 细胞生物学 细胞生物学
- 骨生物学 骨生物学 骨生物学
- 生物化学 生化学
背景情况:
- 脂酶Cββ (PLCβ) 异型调节各种细胞过程.
- PLCβ在骨细胞功能中的作用,特别是骨质细胞生成,仍然在很大程度上未被探索.
- 在骨质细胞分化过程中,PLCβ4被确定为最上调的异型.
研究的目的:
- 研究PLCβ4在骨质细胞分化和骨代谢中的作用.
- 阐明PLCβ4调节骨质细胞生成的分子机制.
- 评估PLCβ4作为骨疾病治疗点的潜力.
主要方法:
- 使用了全球性和骨质细胞系特定的PLCβ4条件淘汰赛小鼠 (LysM-PLCβ4-/-).
- 在体内分析骨质细胞形成,骨质细胞标记基因表达和骨质质量.
- 通过共免疫沉和西式涂抹,研究了蛋白质-蛋白质相互作用和信号通路.
主要成果:
- 缺少PLCβ4显著减少骨质细胞形成,并降低骨质细胞标记基因的调节.
- 雄性LysM-PLCβ4-/-小鼠表现出骨质增加和骨质细胞数量减少,而不会影响骨质细胞功能.
- PLCβ4与MKK3和p38 MAPK相互作用,调节p38的激活,以应对RANKL.
结论:
- 通过MKK3-p38 MAPK通路,PLCβ4是RANKL诱导的骨质细胞分化的关键调节者.
- 向PLCβ4可能为骨质疏松症等骨疾病提供一种新的治疗策略.
- 这项研究揭示了一种新的信号轴,控制骨再吸收.
相关概念视频
01:22PI3K/mTOR/AKT Signaling Pathway
3.4K
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a...
3.4K
01:07MAPK Signaling Cascades
5.1K
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
5.1K
01:11IP3/DAG Signaling Pathway
11.8K
Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
11.8K
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
01:22Amplifying Signals via Enzymatic Cascade
8.2K
When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
8.2K
01:20The JAK-STAT Signaling Pathway
8.6K
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...
8.6K