Effects of Dietary Mushroom on Blood Glucose Levels, Lipid Concentrations and Glutathione Enzymes in Streptozotocin-Induced Diabetic Rats

The purpose of this study was to investigate the effect of dietary mushroom powder on blood glucose levels, seam lipid levels, glucose 6-phosphtase (G6Pase), thiobarbituric arid reactive substance (TBARS) and glutathione enzymes in diabetic rats treated with streptozotocin (STZ). Four groups of rats (Sprague-Dawley male rats, 180-200 g) were fed as follows: normal rats were fed a control diet (C), diabetic rats were file a control diet (CD), normal fats were fed a mushroom powder diet (M), and diabetic rals were find mushroom powder diet (MD). Diabetes was induced by single injection of streptozotocin (60 mg/kg B.W.). The animals were fed ad libium each of the experimental diets for five weeks. Food and water intake was determined every day. Blood glucose and serum total cholesterol levels were determined every week. After five weeks, the rats were sacrificed and blood glucose, serum total cholesterol, triglyceride levels and glutathione enzymes were measured. HDL-cholesterol levels were analyzed and LDL-cholesterol concentrations were calculated by equation. There was body weight loss in the diabetic rats, but the MD group showed less body weight loss than the CD group. Blood glucose and serum total cholesterol level of the MD group were lower than those of the CD group (p < 0.05). Also, serum total cholesterol of the M group was lower than that of the C group (p < 0.05). But the serum triglyceride level of the diabetic rats (CD and MD) was higher than that of the normal rats (C and M). However, there was no significant difference between the control diet group and the mushroom diet group. Serum HDL-cholesterol levels of the C group and CD group were higher than that of the M group (p < 0.05), and the MD group was not significantly different. But the serum LDL-cholesterol levels of the M group were lower than those of the C group (p < 0.05). Activity of hepatic microsomal G6Pase significantly increased in the CD and MD, reaching levels higher than those of the C and M groups. Hepateic gutathione S-transferase (GST, glutathione reductase (GR) and glutathione peroxidase (GPX) activity was not significant. But renal GST, GR and GPX activity in the MD group was lower than that of the CD group (p < 0.05). These results suggest that dietary mushroom reduces renal disorders such as oxidation and aging of tissue. In conclusion, dietary mushroom groups reduced blood glucose and cholesterol levels in STZ-induced diabetic rats and renal glutathione enzymes activity was averted in diabetic rats.

식이 중 표고버섯의 섭취가 당뇨유발쥐의 혈당과 지질농도 및 Glutathione효소계에 미치는 영향