YANG Xia,WANG Zhigang,ZHOU Qi,et al.Effect of Modified Gegen Qinlian Decoction (葛根芩连汤) on the CAP/Cb1/TC10 Signaling Pathway in the Skeletal Muscle of Type 2 Diabetes Model Rats[J].Journal of Traditional Chinese Medicine,2021,62(23):2077-2083.
YANG Xia,WANG Zhigang,ZHOU Qi,et al.Effect of Modified Gegen Qinlian Decoction (葛根芩连汤) on the CAP/Cb1/TC10 Signaling Pathway in the Skeletal Muscle of Type 2 Diabetes Model Rats[J].Journal of Traditional Chinese Medicine,2021,62(23):2077-2083.DOI: 10.13288/j.11-2166/r.2021.23.011.
Effect of Modified Gegen Qinlian Decoction (葛根芩连汤) on the CAP/Cb1/TC10 Signaling Pathway in the Skeletal Muscle of Type 2 Diabetes Model Rats
(葛根芩连汤, MGQD) in the treatment of of type 2 diabetic (T2D).
Methods
2
Forty-eight SD rats were randomly divided into blank group, model group, metformin group, and MGQD high, medium and low dose groups, with eight rats in each group. Except of the blank group, the rats were given a high-fat diet combined with streptozotocin (STZ) to induce the model of T2D. The model group and the blank group were given normal saline (10 ml/kg) by gavage; the MGQD at the dose of 27.2 g/kg, 13.6 g/kg, 6.8 g/kg were given by gavage in the MGQD high, medium and low dose groups, respectively; the metformin group was administered with a dose of 0.15 g/kg metformin hydrochloride enteric-coated tablets; the interventions in all the groups were administered once daily. After 8 weeks, the levels of the fasting blood glucose (FBG), the serum fasting insulin (FINS), free fatty acids (FFA), and glycated hemoglobin (HbA1c), as well as the protein and mRNA expression of skeletal muscle Cbl-related protein (CAP), phosphorylated cannabinoid receptor 1 (p-Cb1), the small GTP binding protein (TC10), and the glucose transporter 4 (GLUT4) were assessed. Pathological morphological changes of the skeletal muscle were observed by HE staining.
Results
2
Compared to those in the model group, the skeletal muscle cells were stained clearly; the cytoplasm was deeper; and the cell spacing decreased as the dosage of MGQD increased; the levels of FBG, FINS, FFA and HbA1c in the metformin group and the MGQD high dose group significantly declined, while the protein and mRNA expression of CAP, p-Cb1, TC10, and GLUT4significantly increased; the levels of FBG, FINS and FFA in the MGQD medium dose group significantly decreased, while the protein expression of CAP, p-Cb1, GLUT4 and the mRNA expression of CAP, GLUT4 increased; the FBG level in the MGQD low dose group was declined, while the mRNA expression of GLUT4 increased (
P
<0.05 or
P
<0.01).
Conclusion
2
MGQD can regulate glucose and lipid metabolism and improve insulin resistance, and the effect is best with highest dose. Its mechanism may be related to the activation of CAP/ Cb1/ TC10 signaling pathway in the skeletal muscle.
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