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1.南京中医药大学 第一临床医学院,南京 210023
2.江苏省中医药防治肿瘤协同创新中心,南京 210023
3.南京中医药大学 医学院·整合医学学院,南京 210023
姜瑞阳,在读硕士,从事中医药防治结直肠癌临床及基础研究,E-mail:15105191723@163.com
徐长亮,博士,讲师,从事中医药防治肿瘤研究,E-mail:113560206@qq.com
收稿日期:2021-09-05,
网络出版日期:2021-12-12,
纸质出版日期:2022-04-20
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姜瑞阳,徐长亮,程海波等.缺氧微环境下仙连解毒方抑制结直肠癌细胞增殖的作用及机制[J].中国实验方剂学杂志,2022,28(08):79-85.
JIANG Rui-yang,XU Chang-liang,CHENG Hai-bo,et al.Effect and Mechanism of Xianlian Jiedu Prescription Against Proliferation of Colorectal Cancer Cells in Hypoxic Microenvironment[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(08):79-85.
姜瑞阳,徐长亮,程海波等.缺氧微环境下仙连解毒方抑制结直肠癌细胞增殖的作用及机制[J].中国实验方剂学杂志,2022,28(08):79-85. DOI: 10.13422/j.cnki.syfjx.20220422.
JIANG Rui-yang,XU Chang-liang,CHENG Hai-bo,et al.Effect and Mechanism of Xianlian Jiedu Prescription Against Proliferation of Colorectal Cancer Cells in Hypoxic Microenvironment[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(08):79-85. DOI: 10.13422/j.cnki.syfjx.20220422.
目的
2
观察缺氧微环境下仙连解毒方对含溴结构域蛋白4(Brd4)诱导的核转录因子-
κ
B(NF-
κ
B)信号通路激活的影响,探讨其抑制结直肠癌细胞HT-29增殖的作用机制。
方法
2
于缺氧培养箱或常氧培养箱中培养人结直肠癌细胞HT-29,给予仙连解毒方(0.8、1、1.2、1.6、3.2、6.4、12.8 g·L
-1
)干预细胞48 h,采用噻唑蓝(MTT)比色法检测细胞活力;采用线粒体膜电位荧光探针(JC-1)检测仙连解毒方(1.25、2.5、5 g·L
-1
)对细胞线粒体膜电位的影响,采用流式细胞术检测结直肠癌细胞HT-29凋亡情况;细胞克隆形成实验及5-乙炔基-2'-脱氧尿苷(EDU)法检测结直肠癌细胞HT-29细胞增殖能力;蛋白免疫印迹法(Western blot)检测Brd4及其下游蛋白如c-核蛋白类基因(c-Myc)、六亚甲基双乙酰胺诱导蛋白1(HEXIM1)的表达水平,同时检测仙连解毒方对NF-
κ
B信号通路相关蛋白的影响。
结果
2
与空白组比较,仙连解毒方(0.8、1、1.2、1.6、3.2、6.4、12.8 g·L
-1
)组均能抑制结直肠癌细胞HT-29细胞活力(
P
<
0.05,
P
<
0.01),且缺氧培养下细胞半数抑制浓度(IC
50
)
>
常氧培养组。与空白组比较,仙连解毒方(1.25、2.5、5 g·L
-1
)组细胞线粒体膜电位明显下降、细胞凋亡增多(
P<
0.05,
P<
0.01)。与空白组比较,仙连解毒方(1.25、2.5、5 g·L
-1
)组细胞克隆数减少,EDU阳性细胞数减少(
P<
0.05,
P<
0.01)。Western blot结果示,与空白组比较,仙连解毒方(1.25、2.5、5 g·L
-1
)组细胞内Brd4、c-Myc蛋白表达量均有不同程度的下降,HEXIM1表达升高(
P<
0.05,
P<
0.01);磷酸化(p)-NF-
κ
B p65、磷酸化NF-
κ
B抑制蛋白
α
(p-I
κ
B
α
)蛋白表达下调(
P<
0.05,
P<
0.01)。
结论
2
缺氧微环境下仙连解毒方可抑制Brd4调控的结直肠癌细胞HT-29增殖,抑制NF-
κ
B信号通路的激活可能是其机制之一。
Objective
2
To study the effect of Xianlian Jiedu prescription (XLJDP) on the activation of nuclear transcription factor-
κ
B (NF-
κ
B) signaling pathway induced by bromodomain-containing protein 4 (Brd4) in hypoxic microenvironment and to explore its mechanism in inhibiting the proliferation of colorectal cancer HT-29 cells.
Method
2
The human colorectal cancer HT-29 cells were cultured in a hypoxic incubator or normoxia incubator and treated with XLJDP at 0.8,1,1.2,1.6,3.2,6.4,and 12.8 g·L
-1
for 48 h, respectively. Following the detection of cell vitality using methyl thiazolyl tetrazolium (MTT) colorimetry, the effects of XLJDP (1.25,2.5,and 5 g·L
-1
) on the cell mitochondrial membrane potential were determined using a fluorescent probe (JC-1), and the apoptosis of colorectal cancer HT-29 cells was detected by flow cytometry. The cell colony formation assay and 5-ethynyl-2'-deoxyuridine (EDU) staining were conducted to test the proliferation of colorectal cancer HT-29 cells. The Western blot was carried out to measure the expression levels of Brd4 and its downstream relevant proteins such as c-Myc and hexamethylene bisacetamide-inducible protein 1 (HEXIM1), as well as the effects of XLJDP on related proteins in the NF-
κ
B signaling pathway.
Result
2
Compared with the blank control group, XLJDP at 0.8,1,1.2,1.6,3.2,6.4,and 12.8 g·L
-1
inhibited the vitality of colorectal cancer HT-29 cells (
P<
0.05 ,
P<
0.01), with the median inhibitory concentration (IC
50
) under the hypoxic condition higher than that under the normoxia condition. Compared with the blank control group, XLJDP at 1.25,2.5,and 5 g·L
-1
significantly decreased the mitochondria membrane potential, enhanced the apoptosis (
P<
0.05,
P<
0.01), and lowered the number of cell colonies and also the EDU-positive cells (
P<
0.05,
P<
0.01). The results of Western blot showed that compared with the blank control group, XLJDP at 1.25,2.5,and 5 g·L
-1
down-regulated Brd4, c-Myc, p-NF-
κ
B p65, and p-I
κ
B
α
protein expression to varying degrees and up-regulated the expression of HEXIM1 (
P<
0.05,
P<
0.01).
Conclusion
2
In the hypoxic microenvironment, XLJDP inhibits the proliferation of colorectal cancer HT-29 cells regulated by Brd4, which may be related to its inhibition of the activation of NF-
κ
B signaling pathway.
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