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1.成都中医药大学 基础医学院,成都 610075
2.四川省第二中医医院,成都 610014
熊珮宇,在读博士,从事溃疡性结肠炎中医药治疗与作用机制研究,E-mail:649716671@qq.com
贾波,教授,博士生导师,从事脾胃病证的方剂配伍理论与临证运用研究,E-mail:jiabocdutcm@126.com
收稿日期:2022-04-30,
网络出版日期:2022-09-01,
纸质出版日期:2023-10-05
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熊珮宇,钟春,张培旭等.基于AMPK/ULK1自噬通路探讨人参败毒散对溃疡性结肠炎黏膜屏障的干预机制[J].中国实验方剂学杂志,2023,29(19):52-59.
XIONG Peiyu,ZHONG Chun,ZHANG Peixu,et al.Renshen Baidusan Protects Mucosal Barrier in Ulcerative Colitis via AMPK/ULK1 Autophagy Pathway[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(19):52-59.
熊珮宇,钟春,张培旭等.基于AMPK/ULK1自噬通路探讨人参败毒散对溃疡性结肠炎黏膜屏障的干预机制[J].中国实验方剂学杂志,2023,29(19):52-59. DOI: 10.13422/j.cnki.syfjx.20222142.
XIONG Peiyu,ZHONG Chun,ZHANG Peixu,et al.Renshen Baidusan Protects Mucosal Barrier in Ulcerative Colitis via AMPK/ULK1 Autophagy Pathway[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(19):52-59. DOI: 10.13422/j.cnki.syfjx.20222142.
目的
2
研究人参败毒散调控腺苷酸活化蛋白激酶/Unc-51样激酶1(AMPK/ULK1)自噬通路抑制溃疡性结肠炎小鼠黏膜屏障损伤的作用机制。
方法
2
将60只SD大鼠随机分为6组,分为正常组,模型组,柳氮磺胺吡啶肠溶片组(西药组),人参败毒散高、中、低剂量组。通过2,4,6-三硝基苯磺酸(TNBS)/50%乙醇诱导UC模型,西药组(0.3125 g·kg
-1
)、人参败毒散高、中、低剂量组(31.2、15.6、7.8 g·kg
-1
)灌胃2周后,检测结肠组织病理学改变;实时荧光定量聚合酶链式反应(Real-time PCR)检测腺苷酸活化蛋白(AMPK
α
)mRNA表达水平;蛋白免疫印迹法(Western blot)检测紧密连接蛋白中闭合蛋白(Occludin)、紧密连接蛋白蛋白-2(Claudin-2)、自噬标志蛋白p62、微管相关蛋白1轻链3B(LC3B)及AMPK/ULK1通路磷酸化蛋白p-AMPK、p-ULK1的表达水平。
结果
2
与正常组比较,模型组结肠损伤评分明显上调(
P
<
0.05),AMPK
α
mRNA表达明显下调(
P
<
0.05),p-AMPK、p-ULK1、Occludin蛋白水平及LC3Ⅱ/Ⅰ明显下调(
P
<
0.05),而p62、Claudin-2蛋白水平明显上调(
P
<
0.05);与模型组比较,人参败毒散高、中、低剂量组的结肠损伤评分下降,AMPK
α
mRNA明显上调,p-AMPK、p-ULK1、Occludin蛋白水平及LC3Ⅱ/Ⅰ上升,而p62、Claudin-2蛋白表达下降,以人参败毒散中剂量组干预效应最明显(
P
<
0.05)。
结论
2
人参败毒散可抗肠道黏膜屏障损伤,以人参败毒散中剂量组疗效最佳,其机制可能与激活AMPK/ULK1自噬通路有关,通过加速LC3Ⅰ向LC3Ⅱ转化,促进p62降解,从而改善紧密连接蛋白Occludin、Claudin-2功能,修复肠道机械屏障损伤。
Objective
2
To study the mechanism of Renshen Baidusan in regulating adenylate-activated protein kinase (AMPK)/Unc-51-like kinase 1 (ULK1) autophagy pathway to inhibit mucosal barrier damage in the mouse model of ulcerative colitis (UC).
Method
2
Sixty SD rats were randomized into normal, model, sulfasalazine enteric-coated tablets (0.312 5 g·kg
-1
, western medicine), and high-, medium-, and low-dose (31.2, 15.6, 7.8 g·kg
-1
, respectively) Renshen Baidusan groups. The UC model was induced by 2,4,6-trinitrobenzenesulfonic acid (TNBS)/50% ethanol. The drugs were administrated by gavage for 2 weeks, and then the histopathological changes of the colon were examined. Real-time quantitative polymerase chain reaction was conducted to measure the mRNA level of AMP-activated protein kinase subunit alpha (AMPK
α
). Western blot was employed to determine the protein levels of closure protein (Occludin), compact linking protein-2 (Claudin-2), autophagy marker p62, microtubule-associated protein 1 light chain 3B (LC3B), phosphorylated AMPK (p-AMPK), and phosphorylated ULK1 (p-ULK1).
Result
2
Compared with the normal group, the model group showed increased colon injury score (
P
<
0.05), down-regulated mRNA level of AMPK
α
(
P
<
0.05) and protein levels of p-AMPK, p-ULK1, and Occludin, decreased LC3Ⅱ/Ⅰ ratio (
P
<
0.05), and up-regulated protein levels of p62 and Claudin-2 (
P
<
0.05). Compared with the model group, all the doses of Renshen Baidusan lowered the colon injury score, up-regulated the mRNA level of AMPK
α
and the protein levels of p-AMPK, p-ULK1, and Occluding, increased LC3Ⅱ/Ⅰ ratio, and down-regulated the protein levels of p62 and Claudin-2. Moreover, the medium-dose group showed a significant intervention effect (
P
<
0.05).
Conclusion
2
Renshen Baidusan can protect the intestinal mucosal barrier from damage, and the medium dose showed the best efficacy. It may activate the AMPK/ULK1 pathway to accelerate the transformation of LC3Ⅰ to LC3Ⅱ and promote the degradation of p62, so as to improve the function of Occludin and Claudin-2 and repair the mechanical damage of the intestinal barrier.
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