Angiotensin II/Angiotensin II Receptor Blockade Affects Osteoporosis via the AT1/AT2-Mediated cAMP-Dependent PKA Pathway

Angiotensin II/Angiotensin II Receptor Blockade Affects Osteoporosis via the AT1/AT2-Mediated cAMP-Dependent PKA Pathway
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血管紧张素 II/血管紧张素 II 受体阻断通过 AT1/AT2 介导的 cAMP 依赖性 PKA 途径影响骨质疏松症

DOI:
10.1159/000464461
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发表时间:
2017-05
影响因子:
2.7
通讯作者:
Wang Huiming
Wang Huiming
中科院分区:
生物学4区
文献类型:
--
作者:
Zhou Yi;Guan Xiaoxu;Chen Xiaoyi;Yu Mengfei;Wang Chaowei;Chen Xuepeng;Shi Jiejun;Liu Tie;Wang Huiming

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动物研究报告了ARB对骨量的益处。然而,血管紧张素II(AngII)/AngII受体阻滞剂(ARB)调节骨量的潜在机制仍然是难以捉摸的。由于高水平的血浆和尿液中的cAMP观察到的骨质疏松症和高血压患者,我们假设,cAMP可能是一个重要的分子的下游事件的激活AT受体,G-蛋白偶联受体家族的成员,在调节骨转换。在这项研究中,micro-CT和X射线分析表明,AngII通过使骨吸收超过骨形成而降低骨质疏松小鼠的骨量。然而,这些不良反应被奥美沙坦和PD 123319阻断。在体外,AngII被证明下调成骨分化和基质矿化,但上调成骨细胞的活性,主要是通过影响成骨细胞产生破骨细胞生成相关的关键可溶性因子,包括M-CSF和RANKL。类似地,ARB处理对AngII表现出拮抗作用。因此,成骨细胞是直接靶细胞。ARB 1比ARB 2具有更大的增加骨量的能力。cAMP依赖性PKA通路在AngII/ARB改变骨量中起重要作用。
Animal studies have reported on the benefits of ARB on bone mass. However, the underlying mechanism for angiotensin II (AngII)/AngII receptor blockade (ARB) in regulating bone mass remains elusive. Since high levels of plasma and urine cAMP are observed in osteoporotic and hypertensive patients, we hypothesized that cAMP may be an important molecule for the downstream events of the activation of AT receptors, members of the G-protein-coupled receptor family, in regulating bone turnover. In this study, micro-CT and X-ray analyses indicated that AngII decreased bone mass via biasing bone resorption over bone formation in osteoporotic mice. However, these adverse effects were blocked by olmesartan and PD123319. In vitro, AngII was shown to downregulate osteogenic differentiation and matrix mineralization, but to upregulate osteoclastic activity by mainly affecting osteoblasts producing osteoclastogenesis-associated key soluble factors, including M-CSF and RANKL. Similarly, ARB treatment exhibited antagonistic effects on AngII. In conclusion, osteoblasts are the directly targeted cells. ARB1 exhibits a greater capacity to increase bone mass than ARB2. The cAMP-dependent PKA pathway plays an important role in AngII/ARB on changing bone mass.
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