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.
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.
Effect of Modified Gegen Qinliantang on TGR5/cAMP/GLP-1 Signaling Pathway in Pancreatic Tissue of Type 2 Diabetes Mellitus db/db Mice
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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