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1.河北医科大学第一医院健康管理中心,石家庄 050000
2.河北医科大学第一医院普外科,石家庄 050000
张硕稳,Email:zswykd@qq.com, 研究方向:乳腺肿瘤,健康管理。
裴永彬,Email:zswykd@qq.com。
收稿:2023-08-31,
修回:2024-03-04,
录用:2024-03-12,
纸质出版:2024-07-28
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张硕稳,李丹,贺静,等.BRD4/NF-κB信号通路介导的铁死亡参与三阴性乳腺癌化疗耐药的机制[J].重庆医科大学学报,2024,49(7):844-852.
Zhang Shuowen,Li Dan,He Jing,et al.Mechanism of ferroptosis mediated by the bromodomain protein subfamily 4/nuclear factor-kappa B signaling pathway in chemotherapy resistance of triple-negative breast cancer[J].Journal of Chongqing Medical University,2024,49(7):844-852.
张硕稳,李丹,贺静,等.BRD4/NF-κB信号通路介导的铁死亡参与三阴性乳腺癌化疗耐药的机制[J].重庆医科大学学报,2024,49(7):844-852. DOI: 10.13406/j.cnki.cyxb.003536.
Zhang Shuowen,Li Dan,He Jing,et al.Mechanism of ferroptosis mediated by the bromodomain protein subfamily 4/nuclear factor-kappa B signaling pathway in chemotherapy resistance of triple-negative breast cancer[J].Journal of Chongqing Medical University,2024,49(7):844-852. DOI: 10.13406/j.cnki.cyxb.003536.
目的
2
探讨溴域蛋白亚家族4(bromodomain protein subfamily 4,BRD4)/核因子κB(nuclear factor kappa-B,NF-κB)信号通路介导的铁死亡参与乳腺癌恶性生物学行为的机制。
方法
2
多柔比星(Doxorubicin,DOX)抗性MDA-MB-231细胞(MDA-MB-231/DOX)分为对照(Con)组、DOX组和si-BRD4+DOX组。si-BRD4+DOX组在用si-BRD4转染MDA-MB-231/DOX细胞48 h后,用1 μmol/L DOX处理细胞24 h。通过集落形成试验和5-乙炔基-2′-脱氧尿苷(5-Ethynyl-2'-deoxyuridine,EdU)分析评估细胞增殖能力。通过FerroOrange、liperfloo检测细胞亚铁离子浓度和脂质过氧化水平。将15只雌性BALB/c-nu小鼠随机分为3组:对照组、DOX组、DOX+si-BRD4组,每组5只,用于建立MDA-MB-231/DOX细胞皮下接种模型。通过qRT-PCR、蛋白质印迹、免疫组化分析BRD4/NF-κB信号通路表达。
结果
2
与si-NC组相比,si-BRD4#1和si-BRD4#2组MDA-MB-231、BT549细胞的细胞克隆数、EDU阳性染色、谷胱甘肽(glutathione,GSH)水平均降低(
P
<
0.001),和MDA-MB-231、BT549细胞亚铁离子水平、活性氧(reactive oxygen species,ROS)水平、氧化型谷胱甘肽(Oxidized glutathione,GSSG)/GSH比值升高(
P
<
0.01)。与亲代细胞(MDA-MB-231)相比,在MDA-MB-231/DOX中BRD4的mRNA和蛋白质表达水平升高。与Con组相比,DOX组细胞中IKβ-α、NF-κB、BRD4表达和ROS水平增加(
P
<
0.05),和细胞克隆数和EDU阳性染色均降低(
P
<
0.05);与DOX组相比,si-BRD4+DOX组细胞中核因子κB抑制蛋白α(Anti-IKB alpha,IKβ-α)、NF-κB表达、细胞克隆数、EDU阳性染色降低(
P
<
0.05),ROS水平升高(
P
<
0.05)。与对照组相比,DOX组肿瘤重量和体积均减少(
P
<
0.05),并且肿瘤组织中TUNEL染色细胞增加(
P
<
0.05)。此外,BRD4+DOX组肿瘤重量和体积较DOX组进一步降低(
P
<
0.001),TUNEL染色细胞进一步增加(
P
<
0.001)。BRD4+DOX组肿瘤组织中Ki-67、BRD4、NF-κB较DOX组下调(
P
<
0.01),4-羟基壬烯醛(4-Hydroxynonenal,4-HNE)上调(
P
<
0.01)。
结论
2
BRD4是一个重要的耐药因子,它可以通过促进NF-κB信号通路的激活来抑制乳腺癌化疗诱导的铁死亡。
Objective
2
To investigate the mechanism of ferroptosis mediated by the bromodomain protein subfamily 4(BRD4)/nuclear factor-kappa B(NF-κB) signaling pathway in the malignant biological behavior of breast cancer.
Methods
2
Doxorubicin-resistant MDA-MB-231 cells(MDA-MB-231/DOX) were divided into control group(Con group),DOX group,and si-BRD4+DOX group. In the si-BRD4+DOX group,MDA-MB-231/DOX cells were transfected with si-BRD4 for 48 hours and were then treated with 1 μmol/L DOX for 24 hours. Colony formation assay and 5-ethynyl-2'-deoxyuridine(EdU) analysis were used to evaluate the proliferation ability of cells,and FerroOrange and liperfloo were used to measure the concentration of ferrous ion and the level of lipid peroxidation. A total of 15 female BALB/c-nu mice were randomly divided into control group,DOX group,and DOX+Si-BRD group,with 5 mice in each group,and a subcutaneous inoculation model of MDA-MB-231/DOX cells was established. The methods of qRT-PCR,Western blotting,and immunohistochemistry were used to measure the expression of the BRD4/NF-κB signaling pathway.
Results
2
Compared with the si-NC group,the si-BRD4#1 group and the si-BRD4#2 group had significant reductions in the number of cell clones,positive EDU staining,and glutathione level in MDA-MB-231 and BT549 cells(
P
<
0.001),as well as significant increases in the level of ferrous ion,the level of reactive oxygen species(ROS),and oxidized glutathione/glutathione ratio(
P
<
0.01). Compared with the parental cells(MDA-MB-231),there were increases in the mRNA and protein expression levels of BRD4 in MDA-MB-231/DOX cells. Compared with the Con group,the DOX group had significant increases in the expression levels of IKβ-α,NF-κB,and BRD4 and the level of ROS(
P
<
0.05) and significant reductions in the number of cell clones and positive EDU staining(
P
<
0.05); compared with the DOX group,the si-BRD4+DOX group had significant reductions in the expression levels of IKβ-α and NF-κB,the number of cell clones,and positive EDU staining(
P
<
0.05) and a significant increase in the level of ROS(
P
<
0.05). Compared with the control group,the DOX group had significant reductions in tumor weight and volume(
P
<
0.05) and a significant increase in the number of TUNEL-stained cells in tumor tissue(
P
<
0.05). In addition,compared with the DOX group,the BRD4+DOX group had further reductions in tumor weight and volume(
P
<
0.001) and a significant increase in the number of TUNEL-stained cells(
P
<
0.001). Compared with the DOX group,the BRD4+DOX group had significant reductions in Ki-67,BRD-4,and NF-κB(
P
<
0.01) and a significant increase in 4-hydroxynonenal(
P
<
0.01) in tumor tissue.
Conclusion
2
BRD4 is an important drug resistance factor,which can inhibit ferroptosis induced by chemotherapy in breast cancer by promoting the activation of the NF-κB signaling pathway.
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