1. Estradiol-enhanced osteogenesis of rat bone marrow stromal cells is associated with the JNK pathway.
- Author
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NAN SONG, ZHI-MIN WANG, LI-JUAN HE, YAN XU, and YAN-LING REN
- Subjects
BONE growth ,MESENCHYMAL stem cells ,CELL proliferation ,STROMAL cells ,BONE morphogenetic proteins ,GENETICS ,PHYSIOLOGY - Abstract
Bone marrow stromal cells (BMSCs) can differentiate into osteoblasts. The present study investigated the osteogenic effects of estradiol, as well as the role of the c-Jun N-terminal kinase (JNK) signaling pathway in promoting estradiol-enhanced osteogenesis of rat (r)BMSCs. rBMSCs were treated for 7 days with or without estradiol and further treated with or without the JNK-specific inhibitor SP600125. The role of estrogen during rBMSC osteogenesis was evaluated by alkaline phosphatase activity and mineralized nodule formation using the Gomori method and Alizarin red S staining, respectively. Subsequently, the mRNA expression levels of transforming growth factor-β1 (TGF-β1) and core-binding factor a1 (Cbfa1) were evaluated by reverse transcription-quantitative polymerase chain reaction, and TGF-β1, Cbfa1 and phosphorylated (p)-JNK protein expression was detected by western blotting. All groups treated with SP600125 expressed low levels of TGF-β1 and Cbfa1 mRNA and protein, and low p-JNK protein expression. Compared with the control cells, rBMSCs cultured with estradiol exhibited a significant upregulation in the expression levels of osteogenic genes and proteins. The present study demonstrated that estradiol enhanced osteogenic differentiation of rBMSCs and that the JNK signaling pathway was involved in this process, providing insights into the molecular mechanisms involved in rBMSC osteogenesis upon estradiol stimulation. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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