作为PDE4抑制剂的罗夫米拉斯和罗利普拉姆可以挽救ADO2骨质细胞再吸收功能障碍
Jung Min Hong1, Rita L Gerard-O'Riley2, Dena Acton2
1Department of Biomedical Sciences and Comprehensive Care, Indiana University School of Dentistry, 1121 West Michigan Street, DS266, Indianapolis, IN, 46202, USA.
Calcified tissue international
|March 14, 2024
概括
自体主导骨质疏松症II型 (ADO2) 骨质细胞具有较低的cAMP水平. 抑制基化酶4 (PDE4) 恢复了cAMP和改善了骨质细胞功能,这表明ADO2骨病的治疗标.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 骨生物学 骨生物学 骨生物学
背景情况:
- 自体主导骨质疏松症II型 (ADO2) 是一种罕见的遗传性骨疾病,其特征是骨质细胞再吸收受损,由CLCN7基因突变引起.
- 骨质细胞功能,包括 lysosomal 酸化,依赖于循环腺单酸盐 (cAMP) 信号,由腺酸环酶和固酶 (PDEs) 调节.
研究的目的:
- 为了研究cAMP水平和基化酶4 (PDE4) 活性在ADO2骨质细胞功能障碍中的作用.
- 为了确定调节cAMP水平或抑制PDE4是否可以挽救ADO2骨质细胞活性.
主要方法:
- 定量PCR (qPCR) 用于分析ADO2和野生型 (WT) 骨干细胞中的PDE4亚型表达.
- 在体外测试以评估骨质细胞形成,再吸收活性和cAMP水平治疗后的福斯科林 (cAMP激活剂) 和PDE4抑制剂 (罗利普拉姆,罗米拉斯).
主要成果:
- 与WT骨质结晶体相比,ADO2骨质结晶体表现出较低的cAMP水平.
- 在ADO2骨质细胞中观察到PDE4亚型 (4a,4b,4d) 的更高表达.
- 罗利普拉姆和罗夫米拉斯的PDE4抑制剂量依赖性增加骨质细胞形成和再吸收活性,在ADO2骨质细胞中效果更大.
- 罗夫米拉斯特治疗在ADO2骨质细胞中恢复了cAMP水平.
结论:
- 在ADO2小鼠中的骨质细胞显示cAMP水平降低,与增加PDE4表达有关.
- 抑制PDE4有效地恢复了cAMP水平,并在体外增强了骨质细胞功能,为ADO2提供了潜在的治疗策略.
- 这些发现为ADO2骨质细胞功能障碍提供了关键的见解,为新型治疗铺平了道路.
相关概念视频
Treatment for Pulmonary Arterial Hypertension: Prostacyclin Receptor Agonists
176
Prostacyclin receptor agonists are a class of therapeutic agents integral to managing pulmonary arterial hypertension (PAH). These drugs operate by mimicking the action of prostaglandin I2, or PGI2, a naturally occurring compound in the body.
These agonists bind to the IPR receptor situated on the plasma membrane of the pulmonary artery smooth muscle cells. This binding triggers a cascade of reactions known as the GS-AC-cAMP-PKA pathway. This pathway results in the relaxation of smooth muscle...
These agonists bind to the IPR receptor situated on the plasma membrane of the pulmonary artery smooth muscle cells. This binding triggers a cascade of reactions known as the GS-AC-cAMP-PKA pathway. This pathway results in the relaxation of smooth muscle...
176
Osteoclasts in Bone Remodeling
2.9K
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...
2.9K
Antiasthma Drugs: Leukotriene Modifiers
297
Leukotriene modifiers, or cysteinyl leukotriene receptor antagonists, are medications used to manage chronic asthma. These agents target specific inflammatory mediators produced during arachidonic acid metabolism, an essential process in generating inflammation in the body.
Leukotriene modifiers work through two distinct mechanisms:
Leukotriene modifiers work through two distinct mechanisms:
297
Treatment for Pulmonary Arterial Hypertension: Phosphodiesterase Inhibitors
156
Phosphodiesterase 5 (PDE5) inhibitors are potent enzymes that function to hydrolyze cyclic nucleotides to their corresponding 5' monophosphates. Their unique biochemical properties have been applied in treating Pulmonary Arterial Hypertension (PAH).
Among the PDE5 inhibitors, sildenafil (Revatio) stands out as a competitive and selective inhibitor. It operates by elevating cellular levels of cGMP and augmenting signaling through the cGMP-PKG pathway, promoting vasodilation. Upon oral...
Among the PDE5 inhibitors, sildenafil (Revatio) stands out as a competitive and selective inhibitor. It operates by elevating cellular levels of cGMP and augmenting signaling through the cGMP-PKG pathway, promoting vasodilation. Upon oral...
156
Bone Remodeling
38.3K
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.
38.3K
Antiasthma Drugs: Mast Cell Stabilizers and Anti-IgE Drugs
294
Asthma is a chronic respiratory condition for which new therapeutic avenues, including anti-inflammatory drugs like mast cell stabilizers and anti-IgE treatments, continue to be developed.
Mast cell stabilizers, such as cromolyn (also known as sodium cromoglycate) and nedocromil (Tilade), are effective drugs in asthma management. These stabilizers hinder histamine release by skillfully obstructing the activation of mast cells and other cellular entities. Notably, they navigate this task without...
Mast cell stabilizers, such as cromolyn (also known as sodium cromoglycate) and nedocromil (Tilade), are effective drugs in asthma management. These stabilizers hinder histamine release by skillfully obstructing the activation of mast cells and other cellular entities. Notably, they navigate this task without...
294


