益生菌对肥胖大鼠血脂紊乱及胰岛素抵抗的影响

Probiotics improve obesity-associated dyslipidemia and insulin resistance in high-fat diet-fed rats

摘要:

目的 观察益生菌嗜酸乳杆菌和短双歧杆菌对肥胖大鼠血脂及胰岛素抵抗相关指标的影响。方法 50只Sprague-Dawley（SD）大鼠随机分为对照组（n=10）和高脂饮食组（n=40），分别予以普通饲料及高脂饲料喂养。4周后再将经高脂饮食诱导成功的36只肥胖大鼠随机分为高脂组、嗜酸乳杆菌组和短双歧杆菌组，每组12只；嗜酸乳杆菌组和短双歧杆菌组分别予以嗜酸乳杆菌150B菌液、短双歧杆菌DM8310菌液灌胃，其余组以生理盐水灌胃，每日1次。4周后测大鼠体重、腹围、体长，检测空腹血糖（FPG）、空腹胰岛素（Fins）、总胆固醇（TC）、甘油三酯（TG）、高密度脂蛋白（HDL）及低密度脂蛋白（LDL）水平，并计算Lee’s指数、胰岛素敏感指数（IAI）、胰岛素分泌指数（IS）和胰岛素抵抗指数（IRI）。结果 高脂组大鼠的体重、腹围、Lee’s指数，以及TC、TG、LDL、FPG、Fins水平和IS、IRI均显著高于对照组（均P<0.05），嗜酸乳杆菌组和短双歧杆菌组上述指标均显著低于高脂组（均P<0.05），但仍高于对照组（均P<0.05）；高脂组大鼠的 HDL及IAI显著低于对照组（均P<0.05），而嗜酸乳杆菌组和短双歧杆菌组上述指标显著高于高脂组（均P<0.05），但仍低于对照组（均P<0.05）；短双歧杆菌组大鼠的Fins水平、IS和IRI显著低于嗜酸乳杆菌组（均P<0.05），而IAI则显著高于嗜酸乳杆菌组（P<0.05）。结论 嗜酸乳杆菌及短双歧杆菌均能一定程度的改善肥胖大鼠的肥胖指数、血脂紊乱及胰岛素抵抗；短双歧杆菌DM8310改善胰岛素抵抗的作用优于嗜酸乳杆菌150B。

Abstract:

Objective To evaluate the effect of probiotics (bifidobacterium breve and lactobacillus acidophilus) on serum lipid, serum insulin and insulin resistance in high-fat diet (HFD)-induced obese rats. Methods Fifty male Sprague-Dawley rats were randomly assigned to a control (n=10) and a high fat diet groups (n=40) and were fed with standard diet and HFD respectively. Four weeks later, thirty-six HFD-induced obese rats were randomly administered with normal saline (NS), bifidobacterium breve and lactobacillus acidophilus daily (n=12 each). Four weeks later, body lengths, body weights and abdomen circumference of rats were measured, blood lipid, glucose and insulin levels were measured, and Lee's index and insulin resistance index were calculated. Results Body weight, abdomen circumference, Lee's index, fasting glucose, triglyceride (TG), total cholesterol (TC), low density lipoprotein (LDL) in the NS-treated HFD group were significantly higher than the control group (P<0.05). The bifidobacterium breve and lactobacillus acidophilus-treated groups had significantly lower levels of body weight, abdomen circumference, Lee's index, fasting glucose, TC, TG and LDL than the NS-treated HFD group (P<0.05), but the levels of the paremeters in the bifidobacterium breve and lactobacillus acidophilus-treated groups were significantly higher than the control group (P<0.05). High density lipoprotein (HDL) and insulin sensitivity index in the NS-treated HFD group were significantly lower than the control group (P<0.05). Bifidobacterium breve and lactobacillus acidophilus treatment dramatically in-creased HDL levels and insulin sensitivity index compared with the NS-treated HFD group (P<0.05), although the levels of the two parameters did not reach to the levels of the control group. There were significant differences in the levels of fasting insulin, insulin resistance index and insulin secretion index between the bifidobacterium breve and lactobacillus acidophilus groups (P<0.05). Conclusions Lactobacillus acidophilus and bifidobacterium breve can decrease serum levels of lipid and glucose and improve insulin resistance in obese rats. Bifidobacterium breve seems to be more effective on attenuating insulin resistance than lactobacillus acidophilus.