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400016 重庆,重庆医科大学中医药学院
[曹文富,E-mail: caowenfu9316@163.com CAO Wenfu, E-mail: caowenfu9316@163.com
收稿:2020-10-02,
修回:2020-12-17,
纸质出版:2021-04-30
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高霞, 程俊雄, 曹文富. 益气法制剂对肝纤维化大鼠的治疗作用及其分子机制[J]. 第三军医大学学报, 2021,43(8):692-699.
Xia GAO, Junxiong CHENG, Wenfu CAO. Efficacy and molecular mechanism of Qi-Tonifying preparations in rats with liver fibrosis[J]. Journal of Third Military Medical University, 2021, 43(8): 692-699.
高霞, 程俊雄, 曹文富. 益气法制剂对肝纤维化大鼠的治疗作用及其分子机制[J]. 第三军医大学学报, 2021,43(8):692-699. DOI: 10.16016/j.1000-5404.202010046.
Xia GAO, Junxiong CHENG, Wenfu CAO. Efficacy and molecular mechanism of Qi-Tonifying preparations in rats with liver fibrosis[J]. Journal of Third Military Medical University, 2021, 43(8): 692-699. DOI: 10.16016/j.1000-5404.202010046.
目的
2
探讨益气法制剂对肝纤维化大鼠的治疗作用及分子机制。
方法
2
7周龄Wistar大鼠,建立肝纤维化模型大鼠前,选取10只为正常对照组;建模成功后,分为模型组(
n
=10)、秋水仙碱组(
n
=9)、益气法制剂组(
n
=9),后两组分别给予相应药物[秋水仙碱制剂0.45 mg/kg,益气法制剂(黄芪、白术)3.6 g/kg
]
,模型组和正常对照组大鼠给予等量生理盐水灌胃,每天1次,连续治疗12周。Western blot检测肝组织中α-平滑肌肌动蛋白(α-SMA)、磷酸化的细胞外信号调节激酶(p-ERK1/2)、磷酸化P38丝裂原活化蛋白酶(p-p38)相关指标表达。RT-qPCR检测肝组织中单核细胞趋化蛋白-1a(MCP-1a)指标的表达。免疫组化检测肝组织中基质金属蛋白酶-2(MMP-2)、基质金属蛋白酶-9(MMP-9)、金属蛋白酶组织抑制因子-1(TIMP-1)指标表达。
结果
2
Western blot结果显示,与正常对照组相比,模型组的α-SMA、p-ERK1/2的表达均升高(
P
<
0.05),p-p38的表达差异无统计学意义;与模型组比较,益气法制剂组和秋水仙碱组的α-SMA、p-p38的表达均降低(
P
<
0.05),秋水仙碱组p-ERK1/2的表达降低(
P
<
0.05),益气法制剂组p-ERK1/2的表达差异无统计学意义,表明益气法制剂可通过抑制α-SMA、p-ERK1/2、p-p38的表达缓解肝纤维化的进程。RT-qPCR结果显示,与正常对照组相比,模型组的MCP-1a的表达上调(
P
<
0.05);与模型组相比,益气法制剂组和秋水仙碱组的MCP-1a表达下调(
P
<
0.05),提示益气法制剂可能通过下调MCP-1a的表达,缓解肝纤维化的进程。免疫组化结果显示,MMP-2在正常对照组明显表达,模型组中可见MMP-2的表达,与模型组相比,益气法制剂组和秋水仙碱组MMP-2的表达上调;MMP-9的表达在正常对照组可见,与正常对照组相比较,模型组上调,与模型组比较,益气法制剂组上调;TIPM-1正常对照组表达较少,与正常对照组相比,模型组的表达有所上调,与模型组相比较,益气法制剂组和秋水仙碱组均下调。
结论
2
益气法制剂可改善大鼠肝纤维化,可能通过抑制MCP-1来减少炎症细胞的释放,进而抑制ERK1/2、p38信号通路的激活,减少磷酸化p-ERK1/2、p-p38介导信号由胞浆向胞核传递,从而抑制TIMP-1的表达,促进MMP-2、MMP-9的释放,增加ECM降解,减少沉积,逆转肝纤维化。
Objective
2
To investigate the therapeutic effect and molecular mechanism of Qi-Tonifying preparations (
Astragalus membranaceus
and
Atractylodes macrocephala
) on hepatic fibrosis in rats.
Methods
2
Wistar rats (7 weeks old) were divided into normal control (
n
=10)
model group (
n
=10)
colchicine group (0.45 mg/kg
n
=9)
and Qi-
Tonifying preparation group (3.6 g/kg
n
=10). Corresponding drugs or normal saline were given to the rats intragastrically
once a day
for continuous 12 weeks. Western blotting was used to detect the expression of α-smooth muscle actin (α-SMA)
phosphorylated extracellular signal regulated kinase 1/2 (p-ERK1/2) and phosphorylated p38 mitogen activated protease (p-p38) in the liver tissues. RT-qPCR was employed to detect the expression of monocyte chemoattractant protein-1a (MCP-1a) in the liver tissues. Immunohistochemical assay was adopted to detect the expression of matrix metalloproteinase-2 (MMP-2)
MMP-9 and metalloproteinase tissue inhibitor-1 (TIMP-1) in the liver tissues.
Results
2
The results of Western blotting showed that the expression levels of α-SMA and p-ERK1/2 were significantly higher in the model group than the normal control group (
P
<
0.05)
but no such difference was seen in that of p-p38 (
P
>
0.05). Compared with the model group
the expression levels of α-SMA and p-p38 were decreased in the Qi-Tonifying preparation group and the colchicine group (
P
<
0.05)
and that of ERK1/2 was decreased obviously in the colchicine group (
P
<
0.05)
but the level was similar in the Qi-Tonifying preparation group (
P
>
0.05). These results suggested that Qi-Tonifying preparations alleviated the progression of liver fibrosis by inhibiting the expression of α-SMA
p-ERK1/2 and p-p38. RT-qPCR results showed that the expression of MCP-1a was significantly increased in the model group than the normal control group (
P
<
0.05)
and was down-regulated in the Qi-Tonifying group and the colchicine group than the model group (
P
<
0.05). Qi-Tonifying preparations alleviated the progression of liver fibrosis by down-regulating MCP-1a. Immunohistochemical assay showed that MMP-2 was obviously expressed in the normal control group
and observ
ed in the model group. Its expression was stronger in the Qi-Tonifying group and the colchicine group than the model group. The expression of MMP-9 was mildly observed in the normal group
and was up-regulated in the model group than the normal group
but down-regulated in the Qi-Tonifying group and the colchicine group when compared with the model group.
Conclusion
2
Qi-Tonifying preparations can improve liver fibrosis in rats
and may reduce the release of inflammatory cells by inhibiting MCP-1
thereby suppressing the activation of ERK1/2 and p38 signaling pathways and reducing phosphorylated p-ERK1/2
P-p38 mediated signal transmission from the cytoplasm to the nucleus
and then inhibits the expression of TIMP-1
promotes the release of MMP-2 and MMP-9
increases ECM degradation
reduces deposition
and finally
reverses liver fibrosis.
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