吉林大学学报(医学版) ›› 2022, Vol. 48 ›› Issue (1): 26-32.doi: 10.13481/j.1671-587X.20220104

• 基础研究 • 上一篇    下一篇

N-乙酰半胱氨酸对尼古丁诱导的MC3T3-E1细胞凋亡的作用及其机制

崔磊华1,侯玉帛2,苏畅3,李明贺3,聂鑫1()   

  1. 1.温州医科大学附属口腔医院口腔颌面外科,浙江 温州 325000
    2.温州医科大学附属口腔医院 牙周科,浙江 温州 325000
    3.吉林大学口腔医院口腔颌面外科,吉林 长春 130021
  • 收稿日期:2021-05-21 出版日期:2022-01-28 发布日期:2022-01-17
  • 通讯作者: 聂鑫 E-mail:dr.xinnie@qq.com
  • 作者简介:崔磊华(1991-),男,新疆维吾尔自治区哈密市人,医师,医学硕士,主要从事口腔颌面部肿瘤免疫学方面的研究。
  • 基金资助:
    国家自然科学基金面上项目(51972240);浙江省教育厅一般科研项目(Y201942009);浙江省温州市科技局基础性科研项目(Y20180700)

Effect of N-acetylcysteine on apoptosis of MC3T3-E1 cells induced by nicotine and its mechanism

Leihua CUI1,Yubo HOU2,Chang SU3,Minghe LI3,Xin NIE1()   

  1. 1.Department of Oral and Maxillofacial Surgery,Affiliated Stomatology Hospital,Wenzhou Medical University,Wenzhou 325000,China
    2.Department of Periodontology,Affiliated Stomatology Hospital,Wenzhou Medical University,Wenzhou 325000,China
    3.Department of Oral and Maxillofacial Surgery,Stomatology Hospital,Jilin University,Changchun 130021,China
  • Received:2021-05-21 Online:2022-01-28 Published:2022-01-17
  • Contact: Xin NIE E-mail:dr.xinnie@qq.com

摘要: 目的

探讨N-乙酰半胱氨酸(NAC)对尼古丁诱导的小鼠前成骨细胞系MC3T3-E1细胞凋亡的影响,并阐明其作用机制。

方法

体外培养MC3T3-E1细胞,采用不同浓度(0、1.0、2.5、5.0和7.5 mmol·L-1)尼古丁诱导MC3T3-E1细胞损伤,采用MTT法检测各组MC3T3-E1细胞增殖活性,并确定尼古丁半数抑制浓度(IC50)。根据IC50值将MC3T3-E1细胞分为对照组、尼古丁组和尼古丁+不同浓度(2.5、5.0和7.5 mmol·L-1)NAC组,采用MTT法检测各组细胞增殖活性,以确定NAC最适作用浓度。将细胞分为对照组、尼古丁(4.25 mmol·L-1)组、NAC(5.0 mmol·L-1)组和尼古丁 (4.25 mmol·L-1)+ NAC(5.0 mmol·L-1)组,采用MitoSOX荧光染色法检测各组细胞中线粒体来源活性氧簇(mitoROS)水平,采用流式细胞术检测各组细胞凋亡率,Western blotting法检测各组细胞中凋亡相关蛋白B细胞淋巴瘤2(Bcl-2)和Bcl-2相关X蛋白(Bax)蛋白表达水平,并计算Bax/Bcl-2比值。

结果

与0 mmol·L-1 尼古丁组比较,不同浓度尼古丁组细胞增殖活性明显降低(P<0.05),且呈浓度依赖性。尼古丁的IC50值为(4.25±0.03) mmol·L-1。与对照组比较, 尼古丁组细胞增殖活性明显降低(P<0.05);与尼古丁组比较,尼古丁+不同浓度 NAC组细胞增殖活性明显升高(P<0.05),尼古丁+5.0 mmol·L-1 NAC组细胞增殖活性升高最明显。与对照组比较,尼古丁组细胞中mitoROS水平明显升高(P<0.05),细胞凋亡率明显升高(P<0.05),细胞中Bax/Bcl-2比值明显升高(P<0.05);与尼古丁组比较,NAC组和尼古丁+NAC组细胞中mitoROS水平明显降低(P<0.05),细胞凋亡率明显降低(P<0.05),尼古丁+NAC组细胞中Bax/Bcl-2比值明显降低(P<0.05)。

结论

NAC可缓解尼古丁诱导的MC3T3-E1细胞凋亡,其作用机制可能与线粒体氧化应激有关。

关键词: MC3T3-E1细胞, 尼古丁, N-乙酰半胱氨酸, 细胞凋亡, 氧化应激

Abstract: Objective

To investigate the effect of N-acetylcysteine (NAC) on the apoptosis of mouse MC3T3-E1 preosteoblast cells induced by nicotine, and to clarify its mechanism.

Methods

The MC3T3-E1 cells were cultured in vitro and treated with different concentrations (0, 1.0, 2.5, 5.0 and 7.5 mmol·L-1) of nicotine to induce the MC3T3-E1 cell injury; MTT method was used to determine the proliferation activities of cells in various groups and the half inhibitory concentration(IC50)of nicotine was determined.The MC3T3-E1 cells were divided into control group, nicotine group, NAC group and nicotine+different concentrations(2.5,5.0,and 7.5 mmol·L-1) NAC groups according the IC50 values, and MTT method was used to determine the proliferation activities of cells in various groups; the optimun concentration of NAC was confirmed.The cells were divided into control group,nicotine (4.25 mmol·L-1) group,NAC(5.0 mmol·L-1) group and nicotine(4.25 mmol·L-1) +NAC(5.0 mmol·L-1) group.The levels of mitochondrial ROS (mitoROS) was assessed with MitoSOX fluorescence staining method; Flow cytometry was used to detect the apoptic rates of MC3T3-E1 cells in various groups; Western blotting method was used to detect the expression level of apoptosis-related proteins B-cell lymphoma-2 (Bcl-2) and Bcl-2 associated X proteins (Bax)in the cells in various groups, and the ratios of Bax/Bcl-2 was calculated.

Results

Compared with 0 mmol·L-1 nicotine group, the proliferation activities of MC3T3-E1 cells in different concentrations of nicotine groups were significantly decreased (P<0.05) in a dose-dependent manner. The IC50 of nicotine was (4.25±0.03) mmol·L-1.Compared with control group,the proliferation activity of MC3T3-E1 cells in 4.25 mmol·L-1 nicotine group was significantly decreased (P<0.05); compared with nicotine group, the proliferation activites of MC3T3-E1 cells in nicotine+different concentrations of NAC groups were increased(P<0.05);the proliferation activity of cells in nicotine+5.0 mmol·L-1 NAC group was the highest. Compared with control group, the levels of mitoROS in the cells in nicotine group was significantly increased (P<0.05), the apoptotic rate of cells was significantly increased (P<0.05),and the ratio of Bax/Bcl-2 was increased (P<0.05);compared with nicotine group, the levels of mitoROS in the cells in NAC and nicotine+NAC group were significantly decreased (P<0.05), the apoptotic rate was significantly reduced (P<0.05),and the ratio of Bax/Bcl-2 in nicotine+NAC group was reduced (P<0.05).

Conclusion

NAC can alleviate the apoptosis of MC3T3-E1 cells induced by nicotine, and its mechanism may be related to the mitochondrial oxidative stress.

Key words: MC3T3-E1 cells, Nicotine, N-acetylcysteine, Apoptosis, Oxidative stress

中图分类号: 

  • Q25