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1.重庆医科大学附属第一医院皮肤科,重庆 400016
2.陆军军医大学新桥医院整形美容科,重庆 400042
谌程程,Email:chencc1991@126.com, 研究方向:皮肤肿瘤。
陈爱军,Email:cajhx@aliyun.com。
收稿:2022-08-27,
修回:2022-10-11,
录用:2023-02-27,
纸质出版:2023-04-28
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谌程程,何平,黄宇婧,等.鸦胆子苦醇调节Nrf2/SLC7A11/GPX4信号通路对皮肤鳞癌细胞铁死亡的影响[J].重庆医科大学学报,2023,48(4):369-374.
Chen Chengcheng,He Ping,Huang Yujing,et al.Influence of brusatol on ferroptosis in cutaneous squamous cell carcinoma cells by regulating Nrf2/SLC7A11/GPX4 signaling pathway[J].Journal of Chongqing Medical University,2023,48(4):369-374.
谌程程,何平,黄宇婧,等.鸦胆子苦醇调节Nrf2/SLC7A11/GPX4信号通路对皮肤鳞癌细胞铁死亡的影响[J].重庆医科大学学报,2023,48(4):369-374. DOI: 10.13406/j.cnki.cyxb.003198.
Chen Chengcheng,He Ping,Huang Yujing,et al.Influence of brusatol on ferroptosis in cutaneous squamous cell carcinoma cells by regulating Nrf2/SLC7A11/GPX4 signaling pathway[J].Journal of Chongqing Medical University,2023,48(4):369-374. DOI: 10.13406/j.cnki.cyxb.003198.
目的
2
探讨鸦胆子苦醇调节核因子E2相关因子2(nuclear factor erythroid-2 related factor 2,Nrf2)/溶质载体家族7成员11(solute carrier family 7 member 11,SLC7A11)/谷胱甘肽过氧化物酶4(glutathione peroxidase 4,GPX4)信号通路对皮肤鳞癌(cutaneous squamous cell carcinoma,cSCC)细胞铁死亡的影响。
方法
2
CCK-8法检测0、100、250、500、700、900 nmol/L鸦胆子苦醇处理后人cSCC细胞系A431细胞增殖率,筛选出合适的鸦胆子苦醇作用浓度。体外培养的A431细胞随机分为对照组、鸦胆子苦醇低剂量组、鸦胆子苦醇高剂量组、特丁基对苯二酚(tert-butylhydroquinone,TBHQ;Nrf2激活剂)组、鸦胆子苦醇高剂量+TBHQ组,以鸦胆子苦醇和TBHQ分组处理后,采用CCK-8法、Hoechst 33342染色法检测各组A431细胞增殖与凋亡;采用试剂盒检测各组A431细胞抗氧化因子[谷胱甘肽(glutathione,GSH)、过氧化氢酶(catalase,CAT)、超氧化物歧化酶(superoxide dismutase,SOD)]水平及铁死亡指标[铁含量、活性氧(reactive oxygen species,ROS)及丙二醛(malondialdehyde,MDA)]水平;采用免疫印迹实验检测各组A431细胞增殖、凋亡及Nrf2/SLC7A11/GPX4信号通路相关蛋白表达。
结果
2
与对照组相比,鸦胆子苦醇低、高剂量
组细胞增殖率、GSH及CAT、SOD水平,以及增殖细胞核抗原(proliferating cell nuclear antigen,PCNA)及Bcl-2、Nrf2、SLC7A11、GPX4蛋白表达均降低(
P
<
0.05),凋亡率、铁含量、ROS及MDA水平和Bax蛋白表达均升高(
P
<
0.05);鸦胆子苦醇高剂量组细胞增殖率、GSH及CAT、SOD水平,以及PCNA及Bcl-2、Nrf2、SLC7A11、GPX4蛋白表达相比鸦胆子苦醇低剂量组进一步降低(
P
<
0.05),凋亡率、铁含量、ROS及MDA水平和Bax蛋白表达进一步升高(
P
<
0.05);TBHQ组细胞增殖率、GSH及CAT、SOD水平,以及PCNA及Bcl-2、Nrf2、SLC7A11、GPX4蛋白表达升高(
P
<
0.05),凋亡率、铁含量、ROS及MDA水平和Bax蛋白表达降低(
P
<
0.05)。与鸦胆子苦醇高剂量组相比,鸦胆子苦醇高剂量+TBHQ组细胞增殖率、GSH及CAT、SOD水平,以及PCNA及Bcl-2、Nrf2、SLC7A11、GPX4蛋白表达升高(
P
<
0.05),凋亡率、铁含量、ROS及MDA水平和Bax蛋白表达降低(
P
<
0.05)。
结论
2
鸦胆子苦醇通过下调Nrf2/SLC7A11/GPX4信号通路而促进铁死亡,诱导cSCC细胞凋亡,并抑制其增殖。
Objective
2
To investigate the influence of brusatol on ferroptosis in cutaneous squamous cell carcinoma(cSCC) by regulating nuclear factor erythroid-2 related factor 2(Nrf2)/solute carrier family 7 member 11(SLC7A11)/glutathione peroxidase 4(GPX4) signaling pathway.
Methods
2
The proliferation rate of human cSCC cell line A431 cells after treatment with 0,100,250,500,700,900 nmol/L of brusatol was detected by CCK-8 method,and the appropriate concentration of brusatol was screened out. The A431 cells cultured
in vitro
were randomly separated into control group,low-dose brusatol group, high-dose brusatol group,tert-butylhydroquinone(TBHQ;Nrf2 activator) group,and high-dose brusatol+TBHQ group. After treatment with brusatol and TBHQ,respectively,the proliferation and apoptosis of A431 cells in each group were detected by CCK-8 method and Hoechst 33342 staining method;Kits were applied to detect the levels of antioxidant factors[glutathione(GSH),catalase(CAT),and superoxide dismutase(SOD)] and ferroptosis indicators[iron content,reactive oxygen species(ROS) and malondialdehyde(MDA)] in A431 cells in each group;the expressions of p
roliferation,apoptosis and Nrf2/SLC7A11/GPX4 signaling pathway-related proteins of A431 cells in each group were detected by Western blot.
Results
2
Compared with the control group,the cell proliferation rate,GSH,CAT,SOD levels,PCNA,Bcl-2,Nrf2,SLC7A11,and GPX4 protein expressions in the low and high dose brusatol groups were all decreased(
P
<
0.05),and the apoptosis rate,iron content,ROS and MDA levels,and Bax protein expression were all increased(
P
<
0.05);the cell proliferation rate,GSH,CAT,SOD levels,proliferating cell nuclear antigen(PCNA),Bcl-2,Nrf2,SLC7A11,and GPX4 protein expressions in the high-dose brusatol group were further decreased than the low-dose brusatol group(
P
<
0.05),and the apoptosis rate,iron content,ROS and MDA levels,and Bax protein expression were further increased(
P
<
0.05);the cell proliferation rate,GSH,CAT,SOD levels,PCNA,Bcl-2, Nrf2,SLC7A11,and GPX4 protein expressions in TBHQ group were increased(
P
<
0.05),and the apoptosis rate,iron content,ROS and MDA levels,and Bax protein expression were decreased(
P
<
0.05). Compared with the high-dose brusatol group,the cell proliferation rate,GSH,CAT,SOD levels,PCNA,Bcl-2,Nrf2,SLC7A11,and GPX4 protein expressions in the high-dose brusatol alcohol+TBHQ group were increased (
P
<
0.05),and the apoptosis rate,iron content,ROS and MDA levels,and Bax protein expression were decreased(
P
<
0.05).
Conclusion
2
Brusatol promotes ferroptosis,induces apoptosis of cSCC cells,and inhibits its proliferation by down-regulating Nrf2/SLC7A11/GPX4 signaling pathway.
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