缺氧和營養(yǎng)缺乏對軟骨終板干細胞凋亡的影響及相關機制
[Abstract]:Aim: to investigate the effects of hypoxia and nutritional deficiency on apoptosis of cartilage endplate-derived stem cells in vitro, and to investigate the role of Bcl-2/adenovirus E1B 19-k Da-interacting protein 3 (BNIP3) signaling pathway in B-cell lymphoma / leukemia / adenovirus E1B 19-k Da binding protein 3 (Bcl-2/adenovirus E1B 19-k Da-interacting protein 3). Methods: the specimens of degenerative intervertebral disc cartilage endplate were obtained from clinic, the chondrocytes were isolated and cultured, CESCs was obtained by agarose screening, and stem cell markers were identified. The third generation cells were cultured in normoxic / complete medium (control group) and hypoxia and nutrition deficiency (experimental group) for 48h respectively. The apoptosis rate was detected by flow cytometry and the cell activity was detected by CCK-8 method. Western Blot was used to detect BNIP3Bcl 2 association. The expression levels of (Bak) and HIF-1 偽 protein associated with Bcl-2 in x protein (Bax) were detected. BNIP3 small interference RNA (siRNA) was used to interfere BNIP3 gene in CESCs, and the negative interference control group (Scramble siRNA),) was used to detect the apoptosis rate, cell activity and the expression level of BNIP3 Bax-Bak protein. Results: stem cell markers were identified in 5 cases of CESCs. The results showed that the cell surface adhesion molecule 44 (CD44) CD73 CD90 and CD105 were positive for CD34, CD45, CD11, CD19 and HLA-DR, indicating that CESCs had stem cell characteristics. The apoptosis rate of experimental group (29.12 鹵0.65)% was significantly higher than that of control group (14.87 鹵2.03)% (P0.05), and the proliferative activity of experimental group was significantly lower than that of control group (56.18%, P0.05). Compared with the control group, the expression of BNIP3 was significantly up-regulated in the experimental group (P0.05). The increase of apoptosis and the decrease of cell proliferation activity induced by hypoxia and nutrition deficiency were significantly inhibited after BNIP3 siRNA interference, and the increase of protein expression of BNIP3, Bax and Bak in CESCs was also significantly reversed by hypoxia and nutritional deficiency (P0.05). Conclusion: hypoxia and nutritional deficiency can induce apoptosis of CESCs, which may be mediated by up-regulating the expression of BNIP3, Bax and Bak proteins.
【作者單位】: 第三軍醫(yī)大學附屬新橋醫(yī)院骨科;
【基金】:國家自然科學基金資助項目(編號:81272028)
【分類號】:R681.5
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