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安徽中医药大学 药学院,安徽省中药研究与开发重点实验室,合肥 230012
蒋婷婷,在读硕士,从事中药及其有效成分抗动脉粥样硬化作用及分子机制研究,E-mail:2036892979@qq.com
戴敏,博士,教授,博士生导师,从事中药及其有效成分抗动脉粥样硬化作用及分子机制研究,E-mail:daiminliao@163.com
收稿日期:2022-11-29,
网络出版日期:2023-03-19,
纸质出版日期:2023-05-20
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蒋婷婷,刘雅蓉,施晓艳等.丹皮酚减轻SIRT6/PARP1介导的DNA损伤抑制血管平滑肌细胞衰老的作用[J].中国实验方剂学杂志,2023,29(10):83-92.
JIANG Tingting,LIU Yarong,SHI Xiaoyan,et al.Inhibitory Effect of Paeonol on Vascular Smooth Muscle Cell Senescence by Reducing SIRT6/PARP1-mediated DNA Damage[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(10):83-92.
蒋婷婷,刘雅蓉,施晓艳等.丹皮酚减轻SIRT6/PARP1介导的DNA损伤抑制血管平滑肌细胞衰老的作用[J].中国实验方剂学杂志,2023,29(10):83-92. DOI: 10.13422/j.cnki.syfjx.20230707.
JIANG Tingting,LIU Yarong,SHI Xiaoyan,et al.Inhibitory Effect of Paeonol on Vascular Smooth Muscle Cell Senescence by Reducing SIRT6/PARP1-mediated DNA Damage[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(10):83-92. DOI: 10.13422/j.cnki.syfjx.20230707.
目的
2
探讨丹皮酚(Pae)对血管紧张素Ⅱ(AngⅡ)诱导的血管平滑肌细胞(VSMCs)衰老的作用及对沉默调节信息因子6(SIRT6)/腺苷二磷酸核糖聚合酶1(PARP1)信号通路的影响。
方法
2
建立AngⅡ(100 nmol·L
-1
)诱导的VSMCs应激性衰老模型,实验分为正常组、模型组、Pae低、中、高(30、60、120 μmol·L
-1
)浓度组。采用
β
-半乳糖苷酶(SA-
β
-Gal)染色法检测细胞衰老阳性率;细胞增殖与活性检测(CCK-8)法检测细胞增殖能力;蛋白免疫印迹法(Western blot)检测SIRT6、PARP1、衰老相关基因p16、p21、p53、增殖细胞核抗原(PCNA)、脱氧核糖核酸(DNA)损伤蛋白磷酸化的组蛋白H2AX(即p-H2AX或
γ
-H2AX)的表达并采用EdU染色法检测VSMCs增殖变化;siRNA-SIRT6转染制备沉默的VSMCs,观察SIRT6沉默的VSMCs中Pae对SIRT6、PARP1及p16、
γ
-H2AX蛋白的表达。
结果
2
SA-
β
-Gal染色结果显示,与正常组比较,模型组SA-
β
-Gal染色衰老阳性率增加(
P
<
0.01);与模型组比较,Pae给药组均有效降低SA-
β
-Gal染色阳性率(
P
<
0.05,
P
<
0.01)。Western blot结果显示,与正常组比较,模型组PCNA、SIRT6、PARP1表达下调、衰老相关蛋白p16、p21、p53、
γ
-H2AX的表达上调(
P
<
0.05,
P
<
0.01);与模型组比较,Pae给药干预后,各浓度组促进了PCNA、SIRT6、PARP1的蛋白表达,抑制了p16、p21、p53、
γ
-H2AX的蛋白表达,且呈剂量依赖性(
P
<
0.05,
P
<
0.01)。EdU染色结果显示,与正常组比较,模型组EdU阳性细胞数减少(
P
<
0.01);与模型组比较,Pae给药组EdU阳性细胞数明显增加(
P
<
0.05,
P
<
0.01)。SIRT6沉默后,Pae促进SIRT6、PARP1及抑制p16的作用被逆转(
P
<
0.05,
P
<
0.01)。此外加入SIRT6抑制剂IN-1可促进AngⅡ诱导细胞衰老的发生(
P
<
0.05,
P
<
0.01)。
结论
2
Pae能够有效抑制VSMCs的衰老,其机制作用可能与调控SIRT6/PARP1信号通路相关。
Objective
2
To investigate whether the effects of paeonol (Pae) on angiotensin Ⅱ (AngⅡ)-induced senescence in vascular smooth muscle cells (VSMCs) were related to angiotensinogen of silencing regulatory information factor 6 (SIRT6)/adenosine diphosphate ribose polymerase 1 (PARP1) signaling pathway in VSMCs.
Method
2
The model of VSMC-stress aging induced by AngⅡ (100 nmol·L
-1
) was established. The rats were divided into normal group, model group, low, medium, and high-concentration Pae groups (30, 60, 120 μmol·L
-1
). The positive rate of cell senescence was detected by SA-
β
-Gal staining, the ability of cell proliferation was detected by the cell counting kit-8 (CCK-8) method, the expression of SIRT6, PARP1, p16, p21, p53, proliferating cell nuclear antigen (PCNA), deoxyribonucleic acid (DNA)-damaged protein
γ
-H2AX was detected by Western blot, and VSMC proliferation was detected by EdU staining. The silenced VSMCs were prepared by siRNA-SIRT6 transfection, and the protein expressions of SIRT6, PARP1, p16, and
γ
-H2AX in VSMCs silenced by SIRT6 were observed.
Result
2
The results of SA-
β
-Gal staining showed that the senescence positive rate of SA-
β
-Gal staining in the model group was higher than that in the normal group (
P
<
0.01), and the positive rate of SA-
β
-Gal staining in the Pae group was significantly lower than that in the model group (
P
<
0.05,
P
<
0.01). The results of Western blot showed that as compared with the normal group, the expression of PCNA, SIRT6, and PARP1 in the model group was down-regulated, and the expression of aging-related proteins p16, p21, p53, and
γ
-H2AX was up-regulated in the model group (
P
<
0.05,
P
<
0.01). Compared with the model group, Pae promoted the protein expression of PCNA, SIRT6, and PARP1 and inhibited the protein expression of p16, p21, p53, and
γ
-H2AX in a dose-dependent manner (
P
<
0.05,
P
<
0.01). The results of EdU staining showed that the number of EdU positive cells in the model group was lower than that in the normal group (
P
<
0.01), and the number of EdU positive cells in Pae groups was significantly higher than that in the model group (
P
<
0.05,
P
<
0.01). After SIRT6 silencing, the effects of Pae on promoting SIRT6 and PARP1 and inhibiting P16 were reversed (
P
<
0.05,
P
<
0.01). In addition, the addition of SIRT6 inhibitor (IN-1) promoted the occurrence of cell senescence induced by AngⅡ (
P
<
0.05,
P
<
0.01).
Conclusion
2
Pae can effectively inhibit the aging of VSMCs, and its mechanism may be related to the regulation of SIRT6/PARP1 signal pathway.
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