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长春中医药大学,长春 130117
张兆鹏,在读硕士,从事中西医结合防治老年病的研究,E-mail:zhaopeng0314@163.com
郭军鹏,博士,教授,硕士生导师,从事中医药防治老年病的研究,E-mail:Guojp1228@163.com
收稿日期:2022-01-11,
网络出版日期:2022-04-12,
纸质出版日期:2022-10-05
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张兆鹏,李秋英,于子晴等.柴芍六君子汤通过TLR4/MyD88/NF-κB信号通路抗溃疡性结肠炎的机制[J].中国实验方剂学杂志,2022,28(19):17-23.
ZHANG Zhaopeng,LI Qiuying,YU Ziqing,et al.Mechanism of Chaishao Liujunzi Tang in Treatment of Ulcerative Colitis Through TLR4/MyD88/NF-κB Signaling Pathway[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(19):17-23.
张兆鹏,李秋英,于子晴等.柴芍六君子汤通过TLR4/MyD88/NF-κB信号通路抗溃疡性结肠炎的机制[J].中国实验方剂学杂志,2022,28(19):17-23. DOI: 10.13422/j.cnki.syfjx.20221108.
ZHANG Zhaopeng,LI Qiuying,YU Ziqing,et al.Mechanism of Chaishao Liujunzi Tang in Treatment of Ulcerative Colitis Through TLR4/MyD88/NF-κB Signaling Pathway[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(19):17-23. DOI: 10.13422/j.cnki.syfjx.20221108.
目的
2
探究柴芍六君子汤对葡聚糖硫酸钠(DSS)诱导的溃疡性结肠炎小鼠结肠黏膜损伤的防治作用及机制。
方法
2
50只Balb/c雄性小鼠,随机分为正常组、模型组、柴芍六君子汤低、高剂量组、柳氮磺吡啶组。除正常组外,其余各组自由饮用2.5% DSS,连续7 d,造模成功后给予药物连续干预7 d。每天记录小鼠体质量、粪便等一般生理状态,计算疾病活动指数(DAI)评分。测量结肠长度;苏木素-伊红(HE)染色观察结肠黏膜组织形态学变化;酶联免疫吸附测定法(ELISA)检测血清中白细胞介素-1
β
(IL-1
β
)、髓过氧化物酶(MPO)和超氧化物歧化酶(SOD)含量。蛋白免疫印迹法(Western blot)检测结肠组织Toll样受体4(TLR4)、髓样分化因子88(MyD88)、核转录因子-
κ
B(NF-
κ
B)、NF-
κ
B抑制蛋白(I
κ
B)、胱天蛋白酶-1(Caspase-1)、NOD样受体蛋白3(NLRP3)蛋白表达水平。
结果
2
与正常组比较,模型组小鼠体质量显著下降(
P
<
0.01),腹泻及便血严重,DAI评分显著增加(
P
<
0.01)。与模型组比较,柴芍六君子汤治疗组小鼠体质量下降趋势得到显著缓解(
P
<
0.01),腹泻及便血状态显著改善,DAI评分显著下降(
P
<
0.01);结肠长度明显增加(
P
<
0.05);HE染色发现治疗组结肠黏膜损伤明显改善,炎细胞浸润减少;与正常组比较,模型组小鼠血清中IL-1
β
、MPO含量显著升高(
P
<
0.01),SOD含量显著降低(
P
<
0.01);与模型组比较,治疗组血清中IL-1
β
、MPO水平显著降低(
P
<
0.01),SOD水平显著升高(
P
<
0.01);Western blot检测结果显示,与正常组比较,模型组小鼠结肠组织TLR4、MyD88、NF-
κ
B、Caspase-1、NLRP3蛋白表达水平显著增加(
P
<
0.01),I
κ
B蛋白表达量显著降低(
P
<
0.01);与模型组比较,柴芍六君子汤治疗组小鼠结肠组织中炎症相关蛋白TLR4、MyD88、NF-
κ
B、Caspase-1、NLRP3蛋白表达水平显著下降(
P
<
0.01),I
κ
B蛋白表达量显著增加(
P
<
0.01)。
结论
2
柴芍六君子汤通过TLR4/MyD88/NF-
κ
B信号通路改善DSS诱导的溃疡性结肠炎小鼠结肠组织的炎症性损伤。
Objective
2
To investigate the preventive and curative effect of Chaishao Liujunzi Tang (CSLJZT) on colonic mucosal injury induced by dextran sulfate sodium (DSS) in mice with ulcerative colitis (UC) and its mechanism.
Method
2
Fifty Balb/c male mice were randomly divided into normal group, model group, CSLJZT low-dose group, CSLJZT high-dose group, and sulfasalazine group. Except for the normal group, other groups were given 2.5% DSS freely for 7 d, and were given drug intervention after successful modeling for 7 d. Bodyweight, feces, and other general physiological statuses of mice were recorded every day, and disease activity index (DAI) scores were calculated.The colon length was measured, and stained by hematoxylin-eosin (HE) staining to observe the morphological changes of the colon.The enzyme-linked immunosorbent assay (ELISA) was used to determine the content of interleukin-1
β
(IL-1
β
), myeloperoxidase (MPO), and superoxide dismutase (SOD) in the serum. Western blot was used to determine the protein expression levels of Toll-like receptor 4 (TLR4), myeloid differentiation factor 88 (MyD88), nuclear factor kappa B (NF-
κ
B), inhibitor-kappa binding protein (I
κ
B), Caspase-1, and nucleotide-binding oligomerization domain-like receptor 3 (NLRP3) in the colon tissues.
Result
2
As compared with the normal group, mice in the model group had significantly decreased body weight (
P
<
0.01), severe diarrhea and hematochezia, and significantly increased DAI score (
P
<
0.01). As compared with the model group, the decreasing trend of body weight was significantly alleviated in the CSLJZT groups (
P
<
0.01), diarrhea and hematochezia were significantly improved, DAI score was significantly decreased (
P
<
0.01), and colon length increased (
P
<
0.05). HE staining showed that the pathological damage of colon tissue was significantly improved and the inflammatory cell infiltration was reduced in the CSLJZT groups as compared with the model group. As compared with the normal group, the serum levels of IL-1
β
and MPO were significantly higher (
P
<
0.01) and SOD levels were significantly lower (
P
<
0.01) of mice in the model group.Compared with the model group, the treated group reduced the serum IL-1
β
and MPO levels (
P
<
0.01), and raised the SOD level (
P
<
0.01). The results of Western blot showed that as compared with the normal group, the expression levels of TLR4, MyD88, NF-
κ
B, Ccaspase-1, and NLRP3 proteins were significantly increased (
P
<
0.01), whereas the expression level of I
κ
B protein was significantly decreased (
P
<
0.01) in the colonic tissue of mice in the model group. As compared with the model group, the expression levels of TLR4, MyD88, NF-
κ
B, Caspase-1, and NLRP3 proteins were decreased (
P
<
0.01), whereas the expression level of I
κ
B protein was increased (
P
<
0.01) in the colonic tissue of mice in the CSLJZT groups.
Conclusion
2
CSLJZT improves the inflammatory injury of the colon tissue in DSS-induced UC mice through TLR4/MyD88/NF-
κ
B signaling pathway.
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