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1.甘肃中医药大学 基础医学院,兰州 730000
2.宁夏医科大学 中医学院,银川 750000
柳荣,在读博士,从事中医不同治法防治糖尿病的效应机制研究,E-mail:2240065473@qq.com
梁永林,博士,教授,主任医师,从事中医基础理论研究,E-mail:875532437@qq.com
收稿日期:2022-07-20,
网络出版日期:2022-11-16,
纸质出版日期:2023-02-20
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柳荣,杨霞,高艳奎等.加味葛根芩连汤对2型糖尿病db/db小鼠胰腺组织TGR5/cAMP/GLP-1信号通路的影响[J].中国实验方剂学杂志,2023,29(04):25-32.
LIU Rong,YANG Xia,GAO Yankui,et al.Effect of Modified Gegen Qinliantang on TGR5/cAMP/GLP-1 Signaling Pathway in Pancreatic Tissue of Type 2 Diabetes Mellitus db/db Mice[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(04):25-32.
柳荣,杨霞,高艳奎等.加味葛根芩连汤对2型糖尿病db/db小鼠胰腺组织TGR5/cAMP/GLP-1信号通路的影响[J].中国实验方剂学杂志,2023,29(04):25-32. DOI: 10.13422/j.cnki.syfjx.20222437.
LIU Rong,YANG Xia,GAO Yankui,et al.Effect of Modified Gegen Qinliantang on TGR5/cAMP/GLP-1 Signaling Pathway in Pancreatic Tissue of Type 2 Diabetes Mellitus db/db Mice[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(04):25-32. DOI: 10.13422/j.cnki.syfjx.20222437.
目的
2
探讨加味葛根芩连汤对肥胖型2型糖尿病(T2DM)模型小鼠血糖血脂及胰腺组织中G蛋白偶联胆汁酸受体5(TGR5)相关途径的影响。
方法
2
将10只7周龄无特定病原体(SPF)级雄性m/m小鼠及50只7周龄SPF级雄性db/db小鼠在SPF级实验室适应性喂养1周。m/m小鼠作为空白组。成模后随机分为5组,每组10只,分别作为模型组、二甲双胍组(0.2 g·kg
-1
)、加味葛根芩连汤高、中、低剂量组(31.9、19.1、6.4 g·kg
-1
),灌胃体积均为10 mL·kg
-1
,模型组和空白组灌服等体积蒸馏水,1次/d,连续12周。定期检测小鼠空腹血糖(FBG)。药物干预12周后,检测血清中糖化血清蛋白(GSP)、血清葡萄糖(GLU)、总胆固醇(TC)、甘油三酯(TG)、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C)水平;采用苏木素-伊红(HE)染色观察各组小鼠胰腺组织病理改变,蛋白免疫印迹法(Western blot)检测胰腺组织TGR5、蛋白激酶A(PKA)、磷酸化(p)-PKA、环磷腺苷效应元件结合蛋白(CREB)、p-CREB、前蛋白转化酶1/3(PC1/3)、胰高糖素样肽-1(GLP-1)蛋白的表达水平,酶联免疫吸附测定法(ELISA)检测胰腺组织环磷腺苷(cAMP)的含量。
结果
2
与空白组比较,模型组小鼠胰腺组织出现病理学改变;小鼠FBG、GSP、GLU、TC、TG、LDL-C水平显著增高(
P
<
0.01),HDL-C水平明显降低(
P
<
0.05);胰腺组织中TGR5、p-PKA(Thr197)/PKA、p-CREB(Ser133)/CREB、PC1/3、GLP-1蛋白表达水平显著降低(
P
<
0.01);胰腺组织中cAMP的含量显著降低(
P
<
0.01)。与模型组比较,治疗组胰腺组织病变程度减轻;加味葛根芩连汤高剂量组及二甲双胍组均能够明显降低db/db小鼠FBG、GSP、GLU、TC、TG、LDL-C水平(
P
<
0.05,
P
<
0.01),显著增高db/db小鼠HDL-C水平(
P
<
0.01);除加味葛根芩连汤中剂量组GLP-1蛋白外,加味葛根芩连汤高、中剂量组及二甲双胍组TGR5、p-PKA(Thr197)/PKA、p-CREB(Ser133)/CREB、PC1/3、GLP-1蛋白表达水平均有不同程度的增加(
P
<
0.05,
P
<
0.01);加味葛根芩连汤高、中剂量组及二甲双胍组胰腺组织中cAMP的含量明显增高(
P
<
0.05,
P
<
0.01)。
结论
2
加味葛根芩连汤能够改善T2DM模型db/db小鼠的葡萄糖稳态,其机制可能与调控TGR5/cAMP/GLP-1信号通路相关蛋白表达有关。
Objective
2
To discuss the effect of modified Gegen Qinliantang (MGQT) on blood glucose and lipids and Takeda G protein-coupled receptor 5 (TGR5)-related pathways in pancreatic tissue of obese type 2 diabetes mellitus (T2DM) mice.
Method
2
A total of 10 male specific pathogen free (SPF) m/m mice (7 weeks old) and 50 male SPF (7 weeks old) were adaptively fed for one week in SPF laboratory. The m/m mice were included in the blank group. T2DM was induce d in the 50 db/db mice. The model mice were randomized into the model group, metformin group (0.2 g·kg
-1
), high-dose, medium-dose, and low-dose (31.9, 19.1, 6.4 g·kg
-1
) MGQT groups, with 10 in each group, and the drug dose was10 mL·kg
-1
. The model group and the blank group received distilled water of the same volume. The administration lasted 12 weeks (once/day). Fasting blood glucose (FBG) was detected regularly. After 12 weeks of administration, serum levels of glycated serum protein (GSP), serum glucose (GLU), total cholesterol (TC), triglycerides (TG), high-density lipoprotein cholesterol (HDL-C), and low-density lipoprotein cholesterol (LDL-C) were detected. Pathological changes in the pancreatic tissue were based on hematoxylin-eosin (HE) staining. Western blot was used to determine the protein expression of TGR5, protein kinase A (PKA), phosphorylated (p)-PKA, cyclic-AMP response element binding protein (CREB), p-CREB, proprotein convertase 1/3 (PC1/3), and glucagon-like peptide-1 (GLP-1) in pancreatic tissues. The level of cyclic adenosine monophosphate (cAMP) in pancreatic tissue was determined by enzyme-linked immunosorbent assay (ELISA).
Result
2
Compared with the blank group, the model group had pathological changes in pancreatic tissue, high levels of FBG, GSP, GLU, TC, TG, and LDL-C (
P
<
0.01), low level of HDL-C (
P
<
0.05), low protein expression of TGR5, p-PKA (Thr197)/PKA, p-CREB (Ser133)/CREB, PC1/3, and GLP-1 in pancreatic tissue (
P
<
0.01), and low content of cAMP in the pancreas (
P
<
0.01). Pancreatic tissue lesion in the treatment groups were milder than that in the model group. Both the high-dose MGQT and metformin can reduce the levels of FBG, GSP, GLU, TC, TG, and LDL-C in db/db mice (
P
<
0.05,
P
<
0.01) and increase the level of HDL-C (
P
<
0.01). Except the GLP-1 protein in the medium-dose MGQT group, the protein expression of TGR5, p-PKA (Thr197)/PKA, p-CREB (Ser133)/CREB, PC1/3, and GLP-1 in the high-dose and medium-dose MGQT groups and the metformin group increased compared with that in the model group (
P
<
0.05,
P
<
0.01). The content of cAMP in the pancreatic tissue of the high-dose and medium-dose MGQT groups and the metformin group was raised compared with that in model group (
P
<
0.05,
P
<
0.01).
Conclusion
2
MGQT can improve the glucose homeostasis in db/db mice with T2DM by regulating TGR5/cAMP/GLP-1 signaling pathway-related protein expression.
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