AIM:To evaluate the effects of ursodeoxycholic acid (UDCA) and/or low-calorie diet (LCD) on a rat model of nonalcoholic steatohepatitis (NASH). METHODS: Fifty-five Sprague-Dawley rats were divided into five groups. Th...AIM:To evaluate the effects of ursodeoxycholic acid (UDCA) and/or low-calorie diet (LCD) on a rat model of nonalcoholic steatohepatitis (NASH). METHODS: Fifty-five Sprague-Dawley rats were divided into five groups. The control group (n = 9) was fed with standard rat diet for 12 wk, NASH group (n = 10) was fed with high-fat diet consisted of normal diet, 10% lard oil and 2% cholesterol for 12 wk, UDCA group (n = 10) was fed with high-fat diet supplemented with UDCA at a dose of 25 mg/(kg · d) in drinking water for 12 wk, LCD group (n = 10) was fed with high-fat diet for 10 wk and then LCD for 2 wk, and UDCA+LCD group (n = 15) was fed with high-fat diet for 10 wk, followed by LCD+UDCA for 2 wk. At the end of the experiment, body weight, serum biochemical index, and hepatopathologic changes were examined. RESULTS: Compared with the control group, rats in the NASH group had significantly increased body weight, liver weight, and serum lipid and aminotransferase levels. All rats in the NASH group developed steatohepatitis, as determined by their liver histology. Compared with the NASH group, there were no significant changes in body weight, liver weight, blood biochemical index, the degree of hepatic steatosis, and histological activity index (HAI) score in the UDCA group; however, body and liver weights were significantly decreased, and the degree of steatosis was markedly improved in rats of both the LCD group and the UDCA+LCD group, but significant improvement with regard to serum lipid variables and hepatic inflammatory changes were seen only in rats of the UDCA+LCD group, and not in the LCD group. CONCLUSION: LCD might play a role in the treatment of obesity and hepatic steatosis in rats, but it exerts no significant effect on both serum lipid disorders and hepatic inflammatory changes. UDCA may enhance the therapeutic effects of LCD on steatohepatitis accompanied by obesity and hyperlipidemia. However, UDCA alone is not effective in the prevention of steatohepatitis induced by high-fat diet.展开更多
AIM To examine the changes of the ghrelin/ghrelin O-acyltransferase(GOAT) axis and the mammalian target of rapamycin(m TOR) pathway in the hypothalamus after sleeve gastrectomy.METHODS A total of 30 obese type-2 diabe...AIM To examine the changes of the ghrelin/ghrelin O-acyltransferase(GOAT) axis and the mammalian target of rapamycin(m TOR) pathway in the hypothalamus after sleeve gastrectomy.METHODS A total of 30 obese type-2 diabetes Sprague-Dawley(SD) rats, 6 wk of age, fed with high-sugar and highfat fodder for 2 mo plus intraperitoneal injection of streptozotocin were randomly divided into three groups: non-operation group(S0 group, n = 10), sham operation group(Sh group, n = 10) and sleeve gastrectomy group(SG group, n = 10). Data of body mass, food intake, oral glucose tolerance test(OGTT), acylated ghrelin(AG) and total ghrelin(TG) were collected and measured at the first day(when the rats were 6 wk old), preoperative day 3 and postoperative week 8. The m RNA expression of preproghrelin, GOAT and neuropeptide Y(NPY), and protein expression of ghrelin, GOAT, GHSR and the m TOR pathway(p-Akt, p-m TOR and p-S6) were measured in the hypothalamus.RESULTS SG can significantly improve metabolic symptoms by reducing body mass and food intake. The obese rats showed lower serum TG levels and no change in AG, but the ratio of AG/TG was increased. When compared with the S0 and Sh groups, the SG group showed decreased TG(1482.03 ± 26.55, 1481.49 ± 23.30 and 1206.63 ± 52.02 ng/L, respectively, P < 0.05), but unchanged AG(153.06 ± 13.74, 155.37 ± 19.30 and 144.44 ± 16.689 ng/L, respectively, P > 0.05). As a result, the ratio of AG/TG further increased in the SG group(0.103 ± 0.009, 0.105 ± 0.013 and 0.12 ± 0.016, respectively, P < 0.05). When compared with the S0 group, SG suppressed m RNA and protein levels of preproghrelin(0.63 ± 0.12 vs 0.5 ± 0.11, P < 0.05) and GOAT(0.96 ± 0.09 vs 0.87 ± 0.08, P < 0.05), but did not change NPY m RNA expression(0.61 ± 0.04 vs 0.65 ± 0.07, P > 0.05) in the hypothalamus. The protein levels of p-Akt, p-m TOR and p-S6 were higher in the SG group, which indicated that the hypothalamic m TOR pathway was activated after SG at the postoperative week 8. CONCLUSION The reduction of ghrelin expression and activation of the m TOR pathway might have opposite effects on food intake, as SG improves obesity and T2 DM.展开更多
Objective: To observe the effect of acupuncture on hyperleptinaemia and hyperinsulinemia for studying its underlying mechanism about anti-obesity and reducing blood lipid in obesity rats. Methods: A total of 80 SD rat...Objective: To observe the effect of acupuncture on hyperleptinaemia and hyperinsulinemia for studying its underlying mechanism about anti-obesity and reducing blood lipid in obesity rats. Methods: A total of 80 SD rats were randomized into normal control, model, acupuncture and medication groups, with 20 cases in each group. Hypothalamic obesity model was established by subcutaneous injection of 15% sodium glutamate (0.2 mL/10 g body weight), once daily and continuously for 5 days. “Zusanli” (足三里 ST 36), “Sanyinjiao”(三阴交 SP 6), “Guanyuan”(关元 CV 4) and “Zhongwan”(中脘 CV 12) were punctured and stimulated electrically (100 Hz, dense-sparse waves, and a suitable strength inducing local muscular tremor) for 15 min, once daily. In medication group, rats were fed with Sibutramine 4 mg/kg, once daily. After 4 weeks’ treatment, Lee’s index was detected, and serum leptin and insulin contents were determined by radioimmunoassay (RIA). Results: Compared with normal control group, Lee’s index, serum leptin and insulin contents of model group increased significantly (P<0.01). Comparison between acupuncture and model groups, Lee’s index and serum leptin of acupuncture group decreased significantly (P<0.01), and serum insulin level also lowered. In comparison with model group, Lee’s index, serum leptin and insulin levels of medication group also lowered. Comparison between acupuncture and medication groups showed that Lee’s index and serum leptin level of acupuncture group were significantly lower than those of the later group (P<0.01), displaying that the therapeutic effect of acupuncture is better than that of Sibutramine in lowering Lee’s index and serum leptin. No significant differences were found between acupuncture and medication groups in body weight and length and serum insulin(P>0.05). Conclusion: Acupuncture can effectively reduce Lee’s index, serum leptin and insulin contents in fasting obese rats, which may contribute to its effect in anti-obesity.展开更多
Purpose: To study the time-effect relationship of action of acupuncture on the satiety center of ventromedial nucleus of hypothalamus (VMH) in rats with experimental obesity. Methods: Microelectrode recording method o...Purpose: To study the time-effect relationship of action of acupuncture on the satiety center of ventromedial nucleus of hypothalamus (VMH) in rats with experimental obesity. Methods: Microelectrode recording method of nerve cells and stereotaxic technique for brain were adopted with discharge frequency (Hz/s) of nerve impulse in VMH as the index, and the time-effect of acupuncture action in different periods between groups were observed. Results: Electric activity in acupuncture group was higher than that in the obesity model group (P<0.001) and the normal group (P<0.01) respectively, and the curve of acupuncture action within 2 hours showed irregular fluctuation. Conclusion: Acupuncture can increase excitability of the satiety center, with a better long-term effect.展开更多
基金Supported by the National Natural Science Foundation of China, No. 3980051 Shanghai Youth Sciences Phosphor Plan, No.2000QB14010
文摘AIM:To evaluate the effects of ursodeoxycholic acid (UDCA) and/or low-calorie diet (LCD) on a rat model of nonalcoholic steatohepatitis (NASH). METHODS: Fifty-five Sprague-Dawley rats were divided into five groups. The control group (n = 9) was fed with standard rat diet for 12 wk, NASH group (n = 10) was fed with high-fat diet consisted of normal diet, 10% lard oil and 2% cholesterol for 12 wk, UDCA group (n = 10) was fed with high-fat diet supplemented with UDCA at a dose of 25 mg/(kg · d) in drinking water for 12 wk, LCD group (n = 10) was fed with high-fat diet for 10 wk and then LCD for 2 wk, and UDCA+LCD group (n = 15) was fed with high-fat diet for 10 wk, followed by LCD+UDCA for 2 wk. At the end of the experiment, body weight, serum biochemical index, and hepatopathologic changes were examined. RESULTS: Compared with the control group, rats in the NASH group had significantly increased body weight, liver weight, and serum lipid and aminotransferase levels. All rats in the NASH group developed steatohepatitis, as determined by their liver histology. Compared with the NASH group, there were no significant changes in body weight, liver weight, blood biochemical index, the degree of hepatic steatosis, and histological activity index (HAI) score in the UDCA group; however, body and liver weights were significantly decreased, and the degree of steatosis was markedly improved in rats of both the LCD group and the UDCA+LCD group, but significant improvement with regard to serum lipid variables and hepatic inflammatory changes were seen only in rats of the UDCA+LCD group, and not in the LCD group. CONCLUSION: LCD might play a role in the treatment of obesity and hepatic steatosis in rats, but it exerts no significant effect on both serum lipid disorders and hepatic inflammatory changes. UDCA may enhance the therapeutic effects of LCD on steatohepatitis accompanied by obesity and hyperlipidemia. However, UDCA alone is not effective in the prevention of steatohepatitis induced by high-fat diet.
基金Supported by the National Natural Science Foundation of China,No.81270969(to Wei Zhang)and No.81300723(to Cheng-Xiang Shan)Shanghai Science and Technology Commission,No.12ZR1439100(to Wei Zhang)
文摘AIM To examine the changes of the ghrelin/ghrelin O-acyltransferase(GOAT) axis and the mammalian target of rapamycin(m TOR) pathway in the hypothalamus after sleeve gastrectomy.METHODS A total of 30 obese type-2 diabetes Sprague-Dawley(SD) rats, 6 wk of age, fed with high-sugar and highfat fodder for 2 mo plus intraperitoneal injection of streptozotocin were randomly divided into three groups: non-operation group(S0 group, n = 10), sham operation group(Sh group, n = 10) and sleeve gastrectomy group(SG group, n = 10). Data of body mass, food intake, oral glucose tolerance test(OGTT), acylated ghrelin(AG) and total ghrelin(TG) were collected and measured at the first day(when the rats were 6 wk old), preoperative day 3 and postoperative week 8. The m RNA expression of preproghrelin, GOAT and neuropeptide Y(NPY), and protein expression of ghrelin, GOAT, GHSR and the m TOR pathway(p-Akt, p-m TOR and p-S6) were measured in the hypothalamus.RESULTS SG can significantly improve metabolic symptoms by reducing body mass and food intake. The obese rats showed lower serum TG levels and no change in AG, but the ratio of AG/TG was increased. When compared with the S0 and Sh groups, the SG group showed decreased TG(1482.03 ± 26.55, 1481.49 ± 23.30 and 1206.63 ± 52.02 ng/L, respectively, P < 0.05), but unchanged AG(153.06 ± 13.74, 155.37 ± 19.30 and 144.44 ± 16.689 ng/L, respectively, P > 0.05). As a result, the ratio of AG/TG further increased in the SG group(0.103 ± 0.009, 0.105 ± 0.013 and 0.12 ± 0.016, respectively, P < 0.05). When compared with the S0 group, SG suppressed m RNA and protein levels of preproghrelin(0.63 ± 0.12 vs 0.5 ± 0.11, P < 0.05) and GOAT(0.96 ± 0.09 vs 0.87 ± 0.08, P < 0.05), but did not change NPY m RNA expression(0.61 ± 0.04 vs 0.65 ± 0.07, P > 0.05) in the hypothalamus. The protein levels of p-Akt, p-m TOR and p-S6 were higher in the SG group, which indicated that the hypothalamic m TOR pathway was activated after SG at the postoperative week 8. CONCLUSION The reduction of ghrelin expression and activation of the m TOR pathway might have opposite effects on food intake, as SG improves obesity and T2 DM.
文摘Objective: To observe the effect of acupuncture on hyperleptinaemia and hyperinsulinemia for studying its underlying mechanism about anti-obesity and reducing blood lipid in obesity rats. Methods: A total of 80 SD rats were randomized into normal control, model, acupuncture and medication groups, with 20 cases in each group. Hypothalamic obesity model was established by subcutaneous injection of 15% sodium glutamate (0.2 mL/10 g body weight), once daily and continuously for 5 days. “Zusanli” (足三里 ST 36), “Sanyinjiao”(三阴交 SP 6), “Guanyuan”(关元 CV 4) and “Zhongwan”(中脘 CV 12) were punctured and stimulated electrically (100 Hz, dense-sparse waves, and a suitable strength inducing local muscular tremor) for 15 min, once daily. In medication group, rats were fed with Sibutramine 4 mg/kg, once daily. After 4 weeks’ treatment, Lee’s index was detected, and serum leptin and insulin contents were determined by radioimmunoassay (RIA). Results: Compared with normal control group, Lee’s index, serum leptin and insulin contents of model group increased significantly (P<0.01). Comparison between acupuncture and model groups, Lee’s index and serum leptin of acupuncture group decreased significantly (P<0.01), and serum insulin level also lowered. In comparison with model group, Lee’s index, serum leptin and insulin levels of medication group also lowered. Comparison between acupuncture and medication groups showed that Lee’s index and serum leptin level of acupuncture group were significantly lower than those of the later group (P<0.01), displaying that the therapeutic effect of acupuncture is better than that of Sibutramine in lowering Lee’s index and serum leptin. No significant differences were found between acupuncture and medication groups in body weight and length and serum insulin(P>0.05). Conclusion: Acupuncture can effectively reduce Lee’s index, serum leptin and insulin contents in fasting obese rats, which may contribute to its effect in anti-obesity.
文摘Purpose: To study the time-effect relationship of action of acupuncture on the satiety center of ventromedial nucleus of hypothalamus (VMH) in rats with experimental obesity. Methods: Microelectrode recording method of nerve cells and stereotaxic technique for brain were adopted with discharge frequency (Hz/s) of nerve impulse in VMH as the index, and the time-effect of acupuncture action in different periods between groups were observed. Results: Electric activity in acupuncture group was higher than that in the obesity model group (P<0.001) and the normal group (P<0.01) respectively, and the curve of acupuncture action within 2 hours showed irregular fluctuation. Conclusion: Acupuncture can increase excitability of the satiety center, with a better long-term effect.
