microRNA-19a protects osteoblasts from dexamethasone via targeting TSC1.

microRNA-19a protects osteoblasts from dexamethasone via targeting TSC1.
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microRNA-19a 通过靶向 TSC1 保护成骨细胞免受地塞米松的影响

DOI:
10.18632/oncotarget.23326
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发表时间:
2018-01-05
期刊:
影响因子:
--
通讯作者:
Wang SG
Wang SG
中科院分区:
其他
文献类型:
--
作者:
Liu G;Chen FL;Ji F;Fei HD;Xie Y;Wang SG

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mTOR 复合物 1 (mTORC1) 的激活可以保护人类成骨细胞免受地塞米松的影响。结节性硬化症复合体 1 (TSC1) 是 mTORC1 上游抑制蛋白。我们在此证明 microRNA-19a(“miR-19a”,-3p)靶向 TSC1 mRNA 的 3' 非翻译区。 miR-19a 的表达下调 OB-6 成骨细胞和原代人成骨细胞中的 TSC1。 miR-19a 激活 mTORC1 并保护人类成骨细胞免受地塞米松的影响。 RAD001 或 Raptor shRNA 抑制 mTORC1 几乎完全消除了 miR-19a 诱导的成骨细胞对地塞米松的细胞保护作用。通过靶向 shRNA 敲低 TSC1 同样会诱导 mTORC1 激活并保护成骨细胞。此外,miR-19a 激活 mTORC1 依赖性 NF-E2 相关因子 2 (Nrf2) 信号传导并抑制地塞米松诱导的成骨细胞中活性氧的产生。 miR-19a 可能通过靶向 TSC1-mTORC1 信号传导来保护人类成骨细胞免受地塞米松的侵害。
Activation of mTOR complex 1 (mTORC1) could protect human osteoblasts from dexamethasone. Tuberous sclerosis complex 1 (TSC1) is mTORC1 upstream inhibitory protein. We demonstrate here that microRNA-19a (“miR-19a”, -3p) targets the 3' untranslated regions of TSC1 mRNA. Expression of miR-19a downregulated TSC1 in OB-6 osteoblastic cells and primary human osteoblasts. miR-19a activated mTORC1 and protected human osteoblasts from dexamethasone. mTORC1 inhibition, by RAD001 or Raptor shRNA, almost completely abolished miR-19a-induced osteoblast cytoprotection against dexamethasone. Knockdown of TSC1 by targeted shRNA similarly induced mTORC1 activation and protected osteoblasts. Moreover, miR-19a activated mTORC1-dependent NF-E2-related factor 2 (Nrf2) signaling and inhibited dexamethasone-induced reactive oxygen species production in osteoblasts. Together, miR-19a protects human osteoblasts from dexamethasone possibly via targeting TSC1-mTORC1 signaling.
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