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广州中医药大学 基础医学院,广州 510006
巫芳华,在读硕士,从事中医药防治心脑血管疾病研究,Tel:020-39358028,E-mail:416985212@qq.com
* 刘微,博士,教授,从事中医药防治心脑血管疾病研究,Tel:020-39358028,E-mail:weiliu1980@yahoo.com
收稿日期:2021-06-12,
网络出版日期:2021-07-27,
纸质出版日期:2021-09-20
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巫芳华,刘玉莲,高宇容等.补阳还五汤通过甲酰肽受体2减轻大鼠脑缺血再灌注后氧化应激损伤[J].中国实验方剂学杂志,2021,27(18):9-15.
WU Fang-hua,LIU Yu-lian,GAO Yu-rong,et al.Buyang Huanwutang Alleviated Oxidative Stress Following Cerebral Ischemia/Reperfusion in Rats by Formyl Peptide Receptor 2[J].Chinese Journal of Experimental Traditional Medical Formulae,2021,27(18):9-15.
巫芳华,刘玉莲,高宇容等.补阳还五汤通过甲酰肽受体2减轻大鼠脑缺血再灌注后氧化应激损伤[J].中国实验方剂学杂志,2021,27(18):9-15. DOI: 10.13422/j.cnki.syfjx.20211838.
WU Fang-hua,LIU Yu-lian,GAO Yu-rong,et al.Buyang Huanwutang Alleviated Oxidative Stress Following Cerebral Ischemia/Reperfusion in Rats by Formyl Peptide Receptor 2[J].Chinese Journal of Experimental Traditional Medical Formulae,2021,27(18):9-15. DOI: 10.13422/j.cnki.syfjx.20211838.
目的
2
探讨补阳还五汤通过甲酰肽受体2(FPR2)对脑缺血再灌注模型大鼠氧化应激反应的抑制作用及神经保护作用。
方法
2
将48只雄性SD大鼠随机分为假手术组、模型组、补阳还五汤组和补阳还五汤联合FPR2抑制剂(Boc-2)组,假手术组仅游离血管,不做插线处理。其他各组运用改良Longa法构建大脑中动脉栓塞(MCAO)模型,缺血2 h后再灌注;再灌注后补阳还五汤组和补阳还五汤联合Boc-2组给予补阳还五汤(16 g·kg
-1
)灌胃,每日2次;补阳还五汤联合Boc-2组术前30 min腹腔注射Boc-2 (0.4 mg·kg
-1
);假手术组与模型组给予等体积生理盐水。再灌注24 h后,退化神经元染色(FJC)观察FJC阳性细胞数目的变化;蛋白免疫印迹法(Western blot)检测缺血侧脑组织凋亡相关蛋白B细胞淋巴瘤-2(Bcl-2),Bcl-2相关X蛋白(Bax)和活化型半胱氨酸天冬氨酸蛋白水解酶-3(cleaved Caspase-3)蛋白表达;生化试剂盒检测缺血侧脑组织中超氧化物歧化酶(SOD),丙二醛(MDA),谷胱甘肽(GSH),一氧化氮(NO)水平;免疫荧光检测还原型辅酶Ⅱ(NADPH)氧化酶2(NOX2)平均荧光强度。
结果
2
与假手术组比较,模型组的FJC阳性细胞数目增加(
P
<
0.01),Bcl-2表达减少(
P
<
0.01),Bax和cleaved Caspase-3表达增加(
P
<
0.01),NO和MDA含量增加(
P
<
0.05,
P
<
0.01),GSH和SOD活性下降(
P
<
0.05,
P
<
0.01),NOX2表达增加(
P
<
0.01);与模型组比较,补阳还五汤组FJC阳性细胞数目减少(
P
<
0.01),Bcl-2表达增加(
P
<
0.01),cleaved Caspase-3和Bax明显减少(
P
<
0.05,
P
<
0.01),NO和MDA减少(
P
<
0.05,
P
<
0.01),GSH和SOD增加(
P
<
0.01),NOX2表达减少(
P
<
0.01)。给予Boc-2后,补阳还五汤的作用部分被抑制。
结论
2
补阳还五汤可以减轻脑缺血再灌注大鼠氧化应激损伤,抑制细胞凋亡,其作用机制可能与FPR2调控NOX2的表达有关。
Objective
2
To investigate the role of formyl peptide receptor 2 (FPR2) in the inhibitory effects of Buyang Huanwutang (BYHWT) on the oxidative stress and its protective effects on cerebral ischemia-reperfusion in rats.
Method
2
Forty-eight male SD rats were randomly divided into sham group, model group, BYHWT group and BYHWT combined with FPR2 inhibitor (Boc-2) group. In the sham group, only the vessels were isolated. In other groups, the middle cerebral artery occlusion (MCAO) model was constructed using the modified Longa method and reperfused after 2 h of ischemia. BYHWT (16 g·kg
-1
) was given by gavaged twice daily after reperfusion in BYHWT group and BYHWT+Boc-2 group. Boc-2 (0.4 mg·kg
-1
) was injected intraperitoneally 30 min before surgery. Equal volume of saline were given instead in sham and model group. After 24 h of reperfusion, Fluoro-Jade C (FJC) staining was performed to observe the changes in the number of FJC-positive cells. Western blot was performed to detect the expression of apoptosis-related B-cell lymphoma-2 (Bcl-2), Bcl-2 associated X (Bax), and cleaved aspartic acid cysteine proteolytic enzyme-3(Caspase-3). Besides, superoxide dismutase (SOD), malondialdehyde (MDA), glutathione (GSH), and nitric oxide (NO) was measured. The mean fluorescence intensity of nicotinamide adenine dinucleotide phosphate Ⅱ(NADPH) oxidase 2 (NOX2) was examined by immunofluorescence.
Result
2
Compared with sham group, the model group showed increased number of FJC-positive cells (
P
<
0.01), decreased Bcl-2 expression (
P
<
0.01), increased Bax and cleaved Caspase-3 expression (
P
<
0.01), increased NO and MDA content (
P
<
0.05,
P
<
0.01), decreased GSH and SOD activities (
P
<
0.05,
P
<
0.01), and increased NOX2 expression (
P
<
0.01). Compared with model group, there were decreased FJC-positive cells (
P
<
0.01), up-regulated Bcl-2 expression (
P
<
0.01) with down-regulated cleaved Caspase-3 and Bax (
P
<
0.05,
P
<
0.01), decreased NO and MDA (
P
<
0.05,
P
<
0.01) with increased GSH and SOD (
P
<
0.01), and decreased NOX2 expression (
P
<
0.01) in the BYHWT group. All the above effects were partially blocked by Boc-2.
Conclusion
2
BYHWT can reduce oxidative stress injury and inhibit apoptosis in cerebral ischemia/reperfusion rats, which may be related with the down-regulation of NOX2 expression by FPR2.
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