Effects of moderate-intensity swimming exercise on hepatic glucose and lipid metabolism disorder in type 2 diabetic rats by regulating PPARγ/NF-κB/ADPN pathway
Objective:To explore the effect of moderate-intensity swimming exercise on liver glucose and lipid metabolism disorder in type 2 diabetic rats and possible mechanism.Method:Eight-week-old male SD rats were randomly selected as a blank control group(negative control group,NC group)and fed with normal food,while the rest were fed with high-fat and high-sugar adaptively for one week.Streptozotocin(Streptozotocin,STZ,30mg/kg)was injected intraperitoneally to produce the T2DM rat model.Sixteen rats were randomly selected as type 2 diabetes model group(diabetic model group,DC group)and type 2 diabetes aerobic exercise group(diabetic swimming group,DS group),with eight rats in each group.Aerobic exercise was intervened by non-weight-bearing swimming.After 3 days of adaptive train-ing,the exercise time was 15min/day,and gradually increased to 60min/day,5 days/week,for a total of 8 weeks of training.During the experiment,the body weight,blood sugar,and liver index of rats in each group were detected;ELISA was used to detect the serum insulin(insulin),tumor necrosis factor-α(TNF-α),interleukin-6(IL-6),interleukin-1β(IL-1β),serum total cholesterol(TC),triglyceride(TG),low-density lipo-protein cholesterol(LDL-C),HDL Lipoprotein cholesterol(HDL-C)and serum alanine aminotransferase(ALT)and aspartate aminotransferase(AST)levels;the expression changes of peroxisome proliferator-activat-ed receptor γ(PPARγ),nuclear factor-κB(NF-κB)and adiponectin(ADPN)in liver tissue were detected.Result:After 8 weeks of aerobic exercise intervention,compared with the DC group,the rats in the DS group had significantly increased body weight,signifiicantly decreased blood sugar(P＜0.01),and significantly increased serum insulin and HDL-C levels(P＜0.01).The serum TNF-α,IL-6,IL-1β and TC,TG,LDL-C,ALT,AST levels were significantly decreased(P＜0.05 or P＜0.01).The liver index and oil red O staining pos-itive area decreased significantly(P＜0.01).The positive area of liver glycogen staining increased significantly(P＜0.01),with neatly arranged liver tissue cells and alleviated fat vacuoles,lipid droplets and inflammatory cell infiltration.The protein and mRNA expression levels of PPARγ,GLUT4 and ADPN in the liver were sig-nificantly increased(P＜0.05 or P＜0.01),and the levels of PPARγ and ADPN immunofluorescence positive cells were significantly increased(P＜0.01).The levels of mRNA and immunofluorescence positive cells of NF-κB were significantly decreased(P＜0.05 or P＜0.01).The mRNA level of ADIPOR2 was also significantly in-creased(P＜0.05),and the protein levels of NF-κB and IL-6 were significantly decreased(P＜0.01).Conclusion:8-week moderate-intensity swimming exercise can improve the disturbance of glucose and lipid me-tabolism by regulating the inflammatory response in the liver of T2DM rats,and the mechanism may be relat-ed to the PPARγ/NF-κB/ADPN pathway.
moderate-intensityswimming exercisetype 2 diabetes mellitusinflammationglucose and lipid metabolism
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