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1.广西中医药大学,南宁 530200
2.广西中医药大学 壮瑶药重点实验室,南宁 530200
林思,在读硕士,从事中药鉴定与分析研究,E-mail:1751493407@qq.com
朱华,博士,二级教授,从事中药品种、质量及资源开发研究,E-mail: zhuhuagx@163.com
收稿日期:2021-06-17,
网络出版日期:2021-07-30,
纸质出版日期:2021-10-05
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林思,朱华,秦慧真等.对叶百部总生物碱对人肝癌SMMC-7721细胞凋亡及Bcl-2,Bax和cleaved Caspase-3蛋白表达的影响[J].中国实验方剂学杂志,2021,27(19):73-79.
LIN Si,ZHU Hua,QIN Hui-zhen,et al.Effect of Stemona tuberosa Alkaloids on Apoptosis of SMMC-7721 Cells and Expression of Bcl-2, Bax, and Cleaved Caspase-3[J].Chinese Journal of Experimental Traditional Medical Formulae,2021,27(19):73-79.
林思,朱华,秦慧真等.对叶百部总生物碱对人肝癌SMMC-7721细胞凋亡及Bcl-2,Bax和cleaved Caspase-3蛋白表达的影响[J].中国实验方剂学杂志,2021,27(19):73-79. DOI: 10.13422/j.cnki.syfjx.20211921.
LIN Si,ZHU Hua,QIN Hui-zhen,et al.Effect of Stemona tuberosa Alkaloids on Apoptosis of SMMC-7721 Cells and Expression of Bcl-2, Bax, and Cleaved Caspase-3[J].Chinese Journal of Experimental Traditional Medical Formulae,2021,27(19):73-79. DOI: 10.13422/j.cnki.syfjx.20211921.
目的
2
研究对叶百部总生物碱对人肝癌SMMC-7721细胞凋亡及B细胞淋巴瘤-2(Bcl-2),Bcl-2相关X蛋白(Bax)和切割型半胱氨酸天冬氨酸蛋白水解酶-3(cleaved Caspase-3)蛋白表达的影响。
方法
2
选择人肝癌SMMC-7721细胞,常规培养及传代,对叶百部总生物碱设置添加干预的质量浓度为50,75,112,167,250 mg·L
-1
,另设置仅添加10%胎牛血清作为空白组。采用噻唑蓝(MTT)比色法和细胞克隆实验观察细胞增殖的作用,Hoechst 33258染色法观察细胞凋亡,蛋白免疫印迹法(Western blot)检测3种凋亡相关蛋白Bcl-2,Bax和cleaved Caspase-3的表达。
结果
2
对叶百部总生物碱可抑制SMMC-7721细胞增殖,与空白组比较,细胞增殖抑制率显著升高(
P
<
0.01),作用24,48,72 h的50%细胞抑制浓度(IC
50
)分别为(173.36±8.75),(112.14±16.50),(96.41±2.60) mg·L
-1
,细胞集落形成抑制率显著升高(
P
<
0.01),存在浓度依赖性。与空白组比较,对叶百部总生物碱可促进细胞凋亡,SMMC-7721细胞凋亡数目和凋亡率显著增加(
P
<
0.01),在荧光正置显微镜下可观察到典型细胞凋亡形态,如亮蓝色细胞核染色,细胞质浓缩和细胞核固缩等。与空白组比较,抑凋亡蛋白Bcl-2表达显著下调(
P
<
0.01);与空白组比较,对叶百部总生物碱75,112,167,250 mg·L
-1
促凋亡蛋白Bax,cleaved Caspase-3蛋白表达显著上调(
P
<
0.01)。
结论
2
对叶百部总生物碱有很好的抑制SMMC-7721细胞增殖和促进凋亡的作用,其机制可能与抑制Bcl-2蛋白表达和促进Bax,cleaved Caspase-3蛋白表达有关。
Objective
2
To investigate the effect of
Stemona tuberosa
alkaloids on the apoptosis of human hepatoma SMMC-7721 cells and the expression of apoptosis-related proteins including B lymphocytoma-2 (Bcl-2), Bcl-2-associated X protein (Bax), and cleaved cysteinyl aspartate-specific protease-3 (cleaved Caspase-3).
Method
2
SMMC-7721 cells were routinely cultured, passaged, and treated with various concentrations (50, 75, 112, 167, and 250 mg·L
-1
) of
S. tuberosa
alkaloids, while those in the blank control group were only treated with 10% fetal bovine serum. The cell proliferation was determined by tetrazolium bromide (MTT) colorimetry and colony assay and the cell apoptosis by Hoechst 33258 staining. The protein expression levels of Bcl-2, Bax, and cleaved Caspase-3 were detected by Western blot.
Result
2
S. tuberosa
alkaloids inhibited the proliferation of SMMC-7721 cells, and the inhibition rate was significantly increased in comparison with that in the blank control group (
P
<
0.01), with the half maximal inhibitory concentrations (IC
50
) at 24 h, 48 h, and 72 h being (173.36±8.75), (112.14±16.50), and (96.41±2.60)mg·L
-1
, respectively. The cell colony-inhibitory activity was significantly increased in a dose-dependent manner (
P
<
0.01). Compared with the blank control group,
S. tuberosa
alkaloids promoted the apoptosis of SMMC-7721 cells, manifested as increased number of apoptotic cells and elevated apoptotic rate (
P
<
0.01). The typical morphological changes such as brightly blue-fluorescent condensed nuclei, cytoplasmic shrinking, and karyopyknosis were found under the upright fluorescence microscope. As revealed by comparison with the blank control group, the expression of Bcl-2 was significantly down-regulated (
P
<
0.01), while the protein expression levels of pro-apoptotic protein Bax and cleaved Caspase-3 in the 75, 112, 167, and 250 mg·L
-1
S. tuberosa
alkaloids groups were significantly up-regulated (
P
<
0.01).
Conclusion
2
S. tuberosa
alkaloids inhibit the proliferation of SMMC-7721 cells and promote their apoptosis possibly by inhibiting Bcl-2 protein expression and promoting Bax and cleaved Caspase-3 protein expression.
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