目的探讨高脂高果糖饮食对SD大鼠衰老的影响及其机制。方法成年雄性SD大鼠分为普通饮食(normal diet,ND)组和高脂高果糖(high fat and high fructose diet,HFHFD)组,干预48周后处死大鼠,取血、肝脏和脑组织。全自动生化分析仪测定血清...目的探讨高脂高果糖饮食对SD大鼠衰老的影响及其机制。方法成年雄性SD大鼠分为普通饮食(normal diet,ND)组和高脂高果糖(high fat and high fructose diet,HFHFD)组,干预48周后处死大鼠,取血、肝脏和脑组织。全自动生化分析仪测定血清三酰甘油(TG)、总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)、高密度脂蛋白胆固醇(HDL-C)。酶联免疫吸附法检测血清与免疫衰老相关的细胞因子白细胞介素2(IL-2)、IL-6和晚期糖基化终末产物(AGEs)水平。采用实时荧光定量PCR和蛋白免疫印迹法检测肝和脑组织中衰老相关基因p16、p21和p53 mRNA和蛋白表达水平。结果经48周处理后,2组大鼠的体重和空腹血糖有统计学差异。HFHFD组大鼠血清TG、TC、LDL-C较ND组显著升高(P<0.05),HDL-C较ND组有增加趋势,但差异无统计学意义。与ND组相比,HFHFD组IL-2水平显著下降,IL-6和AGEs水平明显上升,差异均有统计学意义(均P<0.05)。与ND组相比,HFHFD组肝和脑组织中p16和p21 mRNA表达量均明显增加(P<0.05),p53和p21的蛋白表达量显著增加(P<0.05)。结论长期高脂高果糖饮食会加速大鼠的衰老进程,其机制可能通过损伤其免疫系统和影响肝脑组织中细胞衰老相关基因的表达有关。展开更多
AIM:To evaluate gastrointestinal(GI) symptoms and breath hydrogen responses to oral fructose-sorbitol(F-S) and glucose challenges in eating disorder(ED) patients.METHODS:GI symptoms and hydrogen breath concentration w...AIM:To evaluate gastrointestinal(GI) symptoms and breath hydrogen responses to oral fructose-sorbitol(F-S) and glucose challenges in eating disorder(ED) patients.METHODS:GI symptoms and hydrogen breath concentration were monitored in 26 female ED inpatients for 3 h,following ingestion of 50 g glucose on one day,and 25 g fructose/5 g sorbitol on the next day,after an overnight fast on each occasion.Responses to F-S were compared to those of 20 asymptomatic healthy females.RESULTS:F-S provoked GI symptoms in 15 ED patients and one healthy control(P < 0.05 ED vs control) .Only one ED patient displayed symptom provocation to glucose(P < 0.01 vs F-S response) .A greater symptom response was observed in ED patients with a body mass index(BMI) ≤ 17.5 kg/m 2 compared to those with a BMI > 17.5 kg/m 2(P < 0.01) .There were no differences in psychological scores,prevalence of functional GI disorders or breath hydrogen responses between patients with and without an F-S response.CONCLUSION:F-S,but not glucose,provokes GI symptoms in ED patients,predominantly those with low BMI.These findings are important in the dietary management of ED patients.展开更多
文摘目的探讨高脂高果糖饮食对SD大鼠衰老的影响及其机制。方法成年雄性SD大鼠分为普通饮食(normal diet,ND)组和高脂高果糖(high fat and high fructose diet,HFHFD)组,干预48周后处死大鼠,取血、肝脏和脑组织。全自动生化分析仪测定血清三酰甘油(TG)、总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)、高密度脂蛋白胆固醇(HDL-C)。酶联免疫吸附法检测血清与免疫衰老相关的细胞因子白细胞介素2(IL-2)、IL-6和晚期糖基化终末产物(AGEs)水平。采用实时荧光定量PCR和蛋白免疫印迹法检测肝和脑组织中衰老相关基因p16、p21和p53 mRNA和蛋白表达水平。结果经48周处理后,2组大鼠的体重和空腹血糖有统计学差异。HFHFD组大鼠血清TG、TC、LDL-C较ND组显著升高(P<0.05),HDL-C较ND组有增加趋势,但差异无统计学意义。与ND组相比,HFHFD组IL-2水平显著下降,IL-6和AGEs水平明显上升,差异均有统计学意义(均P<0.05)。与ND组相比,HFHFD组肝和脑组织中p16和p21 mRNA表达量均明显增加(P<0.05),p53和p21的蛋白表达量显著增加(P<0.05)。结论长期高脂高果糖饮食会加速大鼠的衰老进程,其机制可能通过损伤其免疫系统和影响肝脑组织中细胞衰老相关基因的表达有关。
文摘AIM:To evaluate gastrointestinal(GI) symptoms and breath hydrogen responses to oral fructose-sorbitol(F-S) and glucose challenges in eating disorder(ED) patients.METHODS:GI symptoms and hydrogen breath concentration were monitored in 26 female ED inpatients for 3 h,following ingestion of 50 g glucose on one day,and 25 g fructose/5 g sorbitol on the next day,after an overnight fast on each occasion.Responses to F-S were compared to those of 20 asymptomatic healthy females.RESULTS:F-S provoked GI symptoms in 15 ED patients and one healthy control(P < 0.05 ED vs control) .Only one ED patient displayed symptom provocation to glucose(P < 0.01 vs F-S response) .A greater symptom response was observed in ED patients with a body mass index(BMI) ≤ 17.5 kg/m 2 compared to those with a BMI > 17.5 kg/m 2(P < 0.01) .There were no differences in psychological scores,prevalence of functional GI disorders or breath hydrogen responses between patients with and without an F-S response.CONCLUSION:F-S,but not glucose,provokes GI symptoms in ED patients,predominantly those with low BMI.These findings are important in the dietary management of ED patients.
