Objective To observe the effects of Hedysarum Polybotrys polysaccharide(HPS)on the glucose metabolism of small intestinal smooth muscle in rats with diabetic gastroparesis(DGP)of spleen qi deficiency syndrome;To explore its mechanism based on AMPK/GLUT4 signaling pathway.Methods Totally 72 male Wistar rats were randomly divided into 12 in the blank group and the remaining 60 rats were assigned to the model group.The DGP spleen qi deficiency syndrome model was replicated by intraperitoneal injection of streptozotocin+irregular feeding with high-fat and high sugar feed combined with swimming exhaustion method.The model rats were randomly divided into model group,metformin group and HPS high-,medium-and low-dosage groups.The metformin group was given 100 mg/kg metformin hydrochloride by gavage,while the HPS high-,medium-and low-dosage groups were given 200,100 and 50 mg/kg HPS by gavage,respectively.The blank group and model group were given purified water by gavage once a day for 8 consecutive weeks.The gastric emptying rate and small intestine propulsion rate in rats were detected,HE staining was used to observe the smooth muscle morphology of gastric antrum and ileal tissue,immunofluorescence staining was used to detect the expression of glucagon like peptide-1(GLP-1)in ileal tissue,ELISA was used to detect the contents of adiponectin(APN),glucagon(Glu)and insulin(INS)in serum,Western blot was used to detect the protein expressions of glucose transporter(GLUT)4,GLUT1,AMP-activated protein kinase(AMPK)and p-AMPK in ileal tissue.Results Compared with the blank group,the model group rats showed significantly increased random blood glucose,significantly decreased body mass,gastric emptying rate and small intestinal propulsion rate(P<0.01);the edema in the submucosal layer,loose arrangement of connective tissue,infiltration of a small number of lymphocytes,granulocytes and macrophages,reduced number of goblet cells in the ileal tissue,shedding of intestinal villous epithelial cells and widening of the gap between the submucosal layer and the lamina propria;the expression of GLP-1 in ileal tissue was significantly decreased(P<0.05),the contents of serum APN and INS were significantly decreased,and the content of Glu significantly increased(P<0.01),the expressions of GLUT4 and p-AMPK/AMPK proteins in ileal tissue were significantly decreased,while the expression of GLUT1 protein significantly increased(P<0.01).Compared with the model group,rats in metformin group and HPS high-dosage group showed a random decrease in blood glucose,an increase in body mass,gastric emptying rate,and small intestine propulsion rate(P<0.05,P<0.01);a more regular arrangement of gastric antral tissue cells,a reduction of shedding cells and edema,the smooth muscle structure of the ileal tissue was relatively intact,with evenly distributed cells and reduced infiltration of inflammatory cells;the expression of GLP-1 in ileal tissue increased,the contents of serum APN and INS increased,and the content of Glu decreased,the expressions of GLUT4 and p-AMPK/AMPK proteins in ileal tissue increased,while the expression of GLUT1 protein decreased(P<0.05,P<0.01).Conclusion HPS may up-regulate GLUT4 and down-regulate GLUT1 expression through activates AMPK,promotes glucose uptake and utilization by small intestinal smooth muscle,and improves glucose metabolism of DGP rats with spleen qi deficiency syndrome.

Objective To observe the effects of Hedysarum Polybotrys polysaccharide(HPS)on the glucose metabolism of small intestinal smooth muscle in rats with diabetic gastroparesis(DGP)of spleen qi deficiency syndrome;To explore its mechanism based on AMPK/GLUT4 signaling pathway.Methods Totally 72 male Wistar rats were randomly divided into 12 in the blank group and the remaining 60 rats were assigned to the model group.The DGP spleen qi deficiency syndrome model was replicated by intraperitoneal injection of streptozotocin+irregular feeding with high-fat and high sugar feed combined with swimming exhaustion method.The model rats were randomly divided into model group,metformin group and HPS high-,medium-and low-dosage groups.The metformin group was given 100 mg/kg metformin hydrochloride by gavage,while the HPS high-,medium-and low-dosage groups were given 200,100 and 50 mg/kg HPS by gavage,respectively.The blank group and model group were given purified water by gavage once a day for 8 consecutive weeks.The gastric emptying rate and small intestine propulsion rate in rats were detected,HE staining was used to observe the smooth muscle morphology of gastric antrum and ileal tissue,immunofluorescence staining was used to detect the expression of glucagon like peptide-1(GLP-1)in ileal tissue,ELISA was used to detect the contents of adiponectin(APN),glucagon(Glu)and insulin(INS)in serum,Western blot was used to detect the protein expressions of glucose transporter(GLUT)4,GLUT1,AMP-activated protein kinase(AMPK)and p-AMPK in ileal tissue.Results Compared with the blank group,the model group rats showed significantly increased random blood glucose,significantly decreased body mass,gastric emptying rate and small intestinal propulsion rate(P<0.01);the edema in the submucosal layer,loose arrangement of connective tissue,infiltration of a small number of lymphocytes,granulocytes and macrophages,reduced number of goblet cells in the ileal tissue,shedding of intestinal villous epithelial cells and widening of the gap between the submucosal layer and the lamina propria;the expression of GLP-1 in ileal tissue was significantly decreased(P<0.05),the contents of serum APN and INS were significantly decreased,and the content of Glu significantly increased(P<0.01),the expressions of GLUT4 and p-AMPK/AMPK proteins in ileal tissue were significantly decreased,while the expression of GLUT1 protein significantly increased(P<0.01).Compared with the model group,rats in metformin group and HPS high-dosage group showed a random decrease in blood glucose,an increase in body mass,gastric emptying rate,and small intestine propulsion rate(P<0.05,P<0.01);a more regular arrangement of gastric antral tissue cells,a reduction of shedding cells and edema,the smooth muscle structure of the ileal tissue was relatively intact,with evenly distributed cells and reduced infiltration of inflammatory cells;the expression of GLP-1 in ileal tissue increased,the contents of serum APN and INS increased,and the content of Glu decreased,the expressions of GLUT4 and p-AMPK/AMPK proteins in ileal tissue increased,while the expression of GLUT1 protein decreased(P<0.05,P<0.01).Conclusion HPS may up-regulate GLUT4 and down-regulate GLUT1 expression through activates AMPK,promotes glucose uptake and utilization by small intestinal smooth muscle,and improves glucose metabolism of DGP rats with spleen qi deficiency syndrome.