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Deprecated: Implicit conversion from float 278.79999999999995 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Tissue+Cell 2020 ; 67 (ä): 101402 Nephropedia Template TP
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HIF-1alpha induces hypoxic apoptosis of MLO-Y4 osteocytes via JNK/caspase-3 pathway and the apoptotic-osteocyte-mediated osteoclastogenesis in vitro #MMPMID32835935
Song X; Tang Y; Zhu J; Tian Y; Song Z; Hu X; Hong C; Cai Y; Kang F
Tissue Cell 2020[Dec]; 67 (ä): 101402 PMID32835935show ga
Apoptotic osteocytes were found in the hypoxic bone microenvironment in osteoporosis, osteotomy, orthodontic tooth movement and periodontitis, and played a key role in bone remolding and the differentiation of osteoclasts. Hypoxia inducible factor-1alpha(HIF-1alpha), as a transcription factor under hypoxic conditions, has been confirmed to participate in cell apoptosis. However, the effect of HIF-1alpha on osteocytes apoptosis and the osteocyte-mediated osteoclast formation remains elusive. Here, we hypothesized that HIF-1alpha was involved in osteocytes apoptosis. Our results showed that CoCl(2) increased the MLO-Y4 cells apoptosis by upregulating the proapoptotic gene expression of caspase-3. Moreover, siRNA-mediated knockdown of HIF-1alpha decreased the phosphorylation by JNK and the activation of caspase-3 to inhibit the cell apoptosis in MLO-Y4. Furthermore, SP600125, an inhibitor of JNK, reversed CoCl(2)-induced the increased apoptosis of MLO-Y4 cells in term of reducing the expression of caspase-3. These findings revealed that HIF-1alpha served as a pro-apoptotic factor in the apoptosis of MLO-Y4 cells cultured with CoCl(2), by activating the JNK/caspase-3 signaling pathway. Besides, the osteocyte-mediated osteoclastogenesis was reduced with the decline of the expression of HIF-1alpha and caspase-3 in MLO-Y4 cells. Our study provided an idea for a more comprehensive understanding of HIF-1alpha and the process of bone remodeling.