Regulation of human bone marrow stromal cell proliferation and differentiation capacity by glucocorticoid receptor and AP-1 crosstalk.

Regulation of human bone marrow stromal cell proliferation and differentiation capacity by glucocorticoid receptor and AP-1 crosstalk.
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通过糖皮质激素受体和AP-1串扰来调节人骨髓基质细胞增殖和分化能力。

DOI:
10.1002/jbmr.120
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发表时间:
2010-10
影响因子:
6.2
通讯作者:
Trigueros, Cesar
Trigueros, Cesar
中科院分区:
医学1区
文献类型:
--
作者:
Carcamo-Orive, Ivan;Gaztelumendi, Ainhoa;Delgado, Jesus;Tejados, Naiara;Dorronsoro, Akaitz;Fernandez-Rueda, Jon;Pennington, Daniel J.;Trigueros, Cesar

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虽然骨髓脂肪细胞和成骨细胞来源于共同的骨髓基质细胞(BMSCs),但在长期类固醇治疗期间,骨质疏松相关的骨丢失和骨髓脂肪生成的机制尚不清楚。我们在人BMSC(hBMSC)中显示,响应于高浓度糖皮质激素(GC)的糖皮质激素受体(GR)信号传导支持脂肪生成,但通过减少c-Jun表达和hBMSC增殖来抑制骨生成。相反,允许hBMSC增殖的显著较低浓度的GC是正常骨矿化所必需的。相反,血小板衍生生长因子(PDGF)信号传导增加JNK/c-Jun活性和hBMSC扩增,有利于成骨分化而不是脂肪形成。事实上,PDGF拮抗GC/GR信号传导的促脂肪形成性质。因此,我们的研究结果揭示了一种新的c-Jun为中心的信号转导通路的调节网络,在分化的hBMSCs,控制骨生成和脂肪生成之间的增殖依赖性平衡。
Although marrow adipocytes and osteoblasts derive from a common bone marrow stromal cells (BMSCs), the mechanisms that underlie osteoporosis-associated bone loss and marrow adipogenesis during prolonged steroid treatment are unclear. We show in human BMSCs (hBMSCs) that glucocorticoid receptor (GR) signaling in response to high concentrations of glucocorticoid (GC) supports adipogenesis but inhibits osteogenesis by reducing c-Jun expression and hBMSC proliferation. Conversely, significantly lower concentrations of GC, which permit hBMSC proliferation, are necessary for normal bone mineralization. In contrast, platelet-derived growth factor (PDGF) signaling increases both JNK/c-Jun activity and hBMSC expansion, favoring osteogenic differentiation instead of adipogenesis. Indeed, PDGF antagonizes the proadipogenic qualities of GC/GR signaling. Thus our results reveal a novel c-Jun-centered regulatory network of signaling pathways in differentiating hBMSCs that controls the proliferation-dependent balance between osteogenesis and adipogenesis.
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