[1]黄颖,熊华翠,陈柯,等.抑制自噬对根尖乳头干细胞成骨分化水平的影响[J].南方医科大学学报,2019,(01):106.[doi:10.12122/j.issn.1673-4254.2019.01.17]
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抑制自噬对根尖乳头干细胞成骨分化水平的影响()
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《南方医科大学学报》[ISSN:1673-4254/CN:44-1627/R]

卷:
期数:
2019年01期
页码:
106
栏目:
出版日期:
2019-01-26

文章信息/Info

Title:
Inhibition of autophagy suppresses osteogenic differentiation of stem cells from apical papilla
作者:
黄颖熊华翠陈柯朱晓斌尹小萍梁韵罗薇雷期音
关键词:
根尖乳头干细胞肿瘤坏死因子-α自噬分化
Keywords:
stem cells from apical papilla tumor necrosis factor-α autophagy differentiation
DOI:
10.12122/j.issn.1673-4254.2019.01.17
摘要:
目的探讨抑制自噬对根尖乳头干细胞成骨分化水平的影响。方法5、10 ng/mL 肿瘤坏死因子-α(TNF-α)分别处理根尖 乳头干细胞(SCAPs),对照组不做处理,检测自噬相关蛋白LC3-II表达水平,GFP-LC3质粒转染并检测细胞内GFP-LC3数目, 吖啶橙染色检测酸性囊泡情况。TNF-α,TNF-α+3-MA分别处理SCAPs,检测LC3-II 的表达水平,GFP-LC3 质粒转染并检测 GFP-LC3数目,CCK-8法检测细胞活力,流式细胞仪检测细胞凋亡。TNF-α、TNF-α+3-MA分别处理SCAPs,对照组不做处理, 诱导成骨向分化,qRT-PCR检测分化第3、7、14天时成骨相关基因碱性磷酸酶(ALP)、骨涎蛋白(BSP)、骨钙素(OCN)的表达。 结果TNF-α可诱导SCAPs自噬活化:TNF-α组LC3-II/β-actin水平较对照组升高且具有浓度依赖性(P<0.05),TNF-α组GFP-LC3 数目较对照组升高且具有浓度依赖性(P<0.05),TNF-α组酸性囊泡较对照组增多。3-MA可抑制TNF-α诱导的SCAPs自噬活 化:TNF-α+3-MA组LC3-II/β-actin水平及细胞内GFP-LC3数目较TNF-α组显著降低(P<0.05),并下调细胞活力(P<0.05),上调 细胞凋亡水平(P<0.05)。抑制自噬导致SCAPs成骨分化的抑制:TNF-α+3-MA组ALP、BSP表达量在分化第3、7、14 天均较 TNF-α组降低(P<0.05),OCN的表达量在第3、7天较TNF-α组降低(P<0.05)。结论TNF-α可诱导SCAPs自噬水平的活化;自噬 可能对TNF-α作用下的SCAPs起细胞保护作用,对抗细胞凋亡;自噬的抑制将下调TNF-α作用下SCAPs的成骨向分化水平,提 示自噬在TNF-α作用下SCAPs的成骨分化过程中具有重要作用。
Abstract:
Objective To investigate the effects of autophagy on osteogenic differentiation of stem cells from the apical papilla (SCAPs) in the presence of tumor necrosis factor-α (TNF-α) stimulation in vitro. Methods SCAPs treated with TNF-α (0, 5, and 10 ng/mL) with or without 5 mmol/L 3-MA were examined for the expression of autophagy marker LC3- II using Western blotting. The cells were transfected with GFP-LC3 plasmid and fluorescence microscopy was used for quantitative analysis of intracellular GFP-LC3; AO staining was used to detect the acidic vesicles in the cells. The cell viability was assessed with CCK- 8 assays and the cell apoptosis rate was analyzed using flow cytometry. The cells treated with TNF-α or with TNF-α and 3-MA were cultured in osteogenic differentiation medium for 3 to 14 days, and real- time PCR was used to detect the mRNA expressions of osteogenesis-related genes (ALP, BSP, and OCN) for evaluating the cell differentiation. Results TNF-α induced activation of autophagy in cultured SCAPs. Pharmacological inhibition of TNF-α-induced autophagy by 3-MA significantly decreased the cell viability and increased the apoptosis rate of SCAPs (P<0.05). Compared with the cells treated with TNF-α alone, the cells treated with both TNF-α and 3-MA exhibited decreased expressions of the ALP and BSP mRNA on days 3, 7 and 14 during osteogenic induction (P<0.05) and decreased expression of OCN mRNA on days 3 and 7 during the induction (P<0.05). Conclusion Autophagy may play an important role during the osteogenic differentiation of SCAPs in the presence of TNF-α stimulation.

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更新日期/Last Update: 1900-01-01