Osteoprotective effects of estrogen membrane receptor GPR30 in ovariectomized rats

Osteoprotective effects of estrogen membrane receptor GPR30 in ovariectomized rats
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雌激素膜受体GPR30对去势大鼠的骨保护作用

DOI:
10.1016/j.jsbmb.2015.07.002
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发表时间:
2015-11
影响因子:
4.1
通讯作者:
Liu, Gang
Liu, Gang
中科院分区:
生物学2区
文献类型:
--
作者:
Cong, Yu;Zhao, Jian-ning;Zhao, Ming-gao;Liu, Gang

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G 蛋白偶联雌激素受体 30 (GPR30) 在骨组织中表达。然而,关于 GPR30 在绝经后骨质疏松症中的功能知之甚少。在这项研究中,我们检测了 GPR30 对卵巢切除术 (OVX) 诱导的大鼠骨质疏松症的影响,包括对成骨细胞增殖、分化和蛋白质表达的影响。给予 G1(35 μg/kg,腹腔注射,每周 3 次,持续 6 周)(GPR30 的一种特异性激动剂)可防止 OVX 诱导的骨转换率增加、骨矿物质含量和骨矿物质密度降低、骨结构损伤以及骨生物力学特性恶化。此外,G1 不影响 OVX 大鼠的子宫重量。使用从新生大鼠颅骨中分离出的成骨细胞来探索其潜在机制。 G1 (150 pM) 通过 GPR30 的正反馈促进成骨细胞的增殖和分化,然后激活 PI3K-Akt、ERK 和 CREB ​​通路。 G15 (750 pM) 是 GPR30 的特异性拮抗剂,可逆转 G1 治疗引发的上述效应。总之,GPR30 的激活可以保护 OVX 大鼠的骨骼免受骨质疏松症的影响,并且不会对子宫产生不良影响。我们认为GPR30可以作为预防和治疗绝经后骨质疏松症的有效治疗靶点。
G protein-coupled estrogen receptor 30 (GPR30) is expressed in bone tissue. However, little is known regarding the function of GPR30 in postmenopausal osteoporosis. In this study, we examined the effects of GPR30 on ovariectomy (OVX)-induced osteoporosis in rats, including the effects on proliferation, differentiation, and expression of proteins in osteoblasts. Administration of G1 (35 μg/kg, ip, 3 times/week for 6 weeks), a specific agonist of GPR30, prevented OVX-induced increase in bone turnover rate, decrease in bone mineral content and bone mineral density, damage to bone structure, and aggravation of bone biomechanical properties. In addition, G1 did not affect uterine weight in the OVX rats. Osteoblasts isolated from calvarias from newborn rats were used to explore the underlying mechanisms. G1 (150 pM) promoted proliferation and differentiation of osteoblasts through a positive feedback of GPR30, which then activated the PI3K-Akt, ERK, and CREB pathways. G15 (750 pM), a specific antagonist of GPR30, reversed the above effects initiated by G1 treatment. In conclusion, activation of GPR30 protected bones against osteoporosis in OVX rats and exerted no untoward effect on the uterus. We suggest that GPR30 can be used as an effective therapeutic target for the prevention and treatment of postmenopausal osteoporosis.
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