麦冬多糖对妊娠期糖尿病小鼠胰岛抵抗作用的影响

目的观察麦冬多糖(ophiopogon-polysaccharide)对妊娠期糖尿病小鼠胰岛素抵抗作用的影响。方法采用链脲佐菌素(STZ)复制妊娠期小鼠糖尿病模型。将造模成功小鼠随机分为麦冬多糖125 mg.kg-1组、500 mg.kg-1组、格列本脲组、模型组,每组各10只。另取10只正常妊娠小鼠,作为正常对照组。连续灌胃给药14 d,分别于给药第0、7、14天测定小鼠空腹血糖,给药第14天测定小鼠血清胰岛素水平及C-反应蛋白含量。结果口服麦冬多糖各剂量组均可降低妊娠糖尿病小鼠的空腹血糖、血清胰岛素水平及C-反应蛋白(CRP)水平,与模型组比较,差异有显著性(P<0.05)。结论麦冬多糖有改善妊娠期糖尿病小鼠胰岛素抵抗的作用,其机制可能与降低及C-反应蛋白(CRP)水平有关。     

吡格列酮对2型糖尿病大鼠血清炎症介质和糖耐量的影响

目的探讨吡格列酮对2型糖尿病大鼠炎症因子及其糖耐量水平的影响。方法8周龄健康Wistar大鼠,用链脲菌素（STZ）加高脂肪高热卡饮食诱导2型糖尿病大鼠模型,将糖尿病大鼠随机分为2组：糖尿病组（n=10）、吡格列酮组（n=10,10mg·kg-1．d-1,灌胃）,健康Wistar大鼠作为对照组（n=10）,糖尿病组和对照组给予同体积生理盐水灌胃,8周后分别测定空腹血糖（FBG）和胰岛素水平（FINS）,进行口服葡萄糖耐量试验（OGTT）,计算胰岛素抵抗指数（HOMA。IR）,测定大鼠血清中白介素1B（IL-1B）、白介素6（IL．6）、肿瘤坏死因子α（TNF-α）、急相反应蛋白C（CRP）水平。结果FBG、FINS和HOMA-R水平,糖尿病组比对照组显著升高（P〈0．05）,而吡格列酮可以明显降低糖尿病大鼠的水平,差异有统计学意义（P〈0．05）;OGTF实验结果显示：糖尿病大鼠餐后血糖水平明显升高（P〈0．05）,吡咯列酮明显减低糖尿病大鼠餐后血糖水平差异有统计学意义（P〈0．05）;IL-1β、IL-6、TNF-α、CRP水平与正常对照组比较糖尿病组显著升高（P〈0．05）,而吡格列酮可以明显降低糖尿病大鼠的水平,差异有统计学意义（P〈0．05）。结论吡格列酮可下调血清炎症因子的表达,改善胰岛素抵抗。     

柚皮苷对实验性2型糖尿病大鼠的作用研究

目的:研究柚皮苷对实验性2型糖尿病(T2DM)大鼠的药理作用.方法:通过给予大鼠高脂饲料结合小剂量链脲菌素(30 mg·kg-1)制备T2DM模型.动物分为正常对照组、模型组、阳性对照组、柚皮苷高剂量组(400 mg·kg-1)和低剂量组(200 mg·kg-1),连续给药20 d,测定空腹血糖,糖耐量,空腹胰岛素、血脂、肝脏MDA含量及SOD的活力.结果:与糖尿病模型组比较,柚皮苷两剂量组的空腹血糖,空腹胰岛素,总胆固醇,三酰甘油和肝脏MDA含量均显著降低(P<0.05);体重减少得到缓解;肝脏SOD的活力显著提高(P<0.01).结论:柚皮苷可以纠正T2DM大鼠的糖代谢和脂质代谢紊乱,减轻胰岛素抵抗,增强机体抗氧化能力,对肝脏起到保护作用.     

奥美沙坦对胰岛素抵抗大鼠血清肿瘤坏死因子-α和脂联素的影响

目的探讨奥美沙坦对胰岛素抵抗大鼠血清TNF-α及脂联素的影响。方法正常Sprague-Dawley雄性大鼠39只,随机分为正常对照组(n=9)和造模组(n=30)。高脂喂养6周后尾静脉采血查空腹血糖(FBG)、空腹胰岛素(FINS),并计算胰岛素敏感指数(ISI),确定27只胰岛素抵抗大鼠模型建立。将胰岛素抵抗大鼠再随机分为3组:①模型组(n=9):给予高脂饮食;②二甲双胍组(n=9):在高脂饮食的基础上加用二甲双胍(300mg·kg-1·d-1);③奥美沙坦组(n=9):在高脂饮食的基础上加用奥美沙坦(3mg·kg-1·d-1)。干预6周后,测定FBG、FINS,计算ISI;测定TNF-α及脂联素水平。结果奥美沙坦组与模型组比较,TNF-α明显减低(P<0.01),脂联素明显增高(P<0.05)。结论奥美沙坦可能通过降低TNF-α,增高脂联素水平而改善胰岛素抵抗。     

Effect of Urena lobataleaves extract on the improvements of lipid profiles on diabetic rats

OBJECTIVE To investigate effect of U.lobataleaves extract on the improvement of lipid profiles on diabetic rats.METHODS This study uses control group post test only with male Sprague dawley rats.Diabetic rats was induced by high fructose diet(HFD)and single dose streptozotocin 25mg·kg-1 bw intra peritoneal.The rat was administrated orally with water extract of U.lobataleaves in dose of 250,500 and 1000mg·kg-1 bw for 4weeks.After scarifying,blood sample was collected and then total cholesterol(TC)serum level,triglyceride(TG),low density lippoprotein(LDL)and high density lipoprotein(HDL)were examined.The data was analyzed using ANOVA test continued with LSD test(P<0.05).RESULTS The supplementation of water extract from U.lobatain dose of 250,500 and 1000mg·kg-1 bw decrease TC serum level approximately 15%,25% and 35% compared to diabetic group(P<0.05),whereas the TG was decreased by 10%,20% and 30%(P<0.05)respectively.The oral administration of U.lobataleaves extract 250,500 and 1000mg·kg-1 bw also were able to decrease LDL serum level about 30%,60% and 90%respectively compared to diabetic group(P<0.05),while the HDL serum level was increased by 40%,80% and 100%(P<0.05)respectively.In diabetic groups,HDL level serum was decreased compared to normal group(P<0.05)while the TC,TG and HDL were increased(P<0.05).CONCLUSION U.lobata leaves extract could repair lipid profiles of diabetic rats by increasing of HDL serum level,decreasing of TC serum level,TG and LDL.This potency may be related to active substances which act as an anti-cholesterolemia and antioxidant in U.lobata extract.     

苣荬菜水煎液对糖尿病大鼠的降血糖作用及其机制

目的观察苣荬菜水煎液对链脲佐菌素致糖尿病大鼠模型的降血糖作用及其机制。方法采用一次性腹腔注射链脲佐菌素的方法制作大鼠糖尿病模型,将大鼠分为空白组,模型组,二甲双胍组(0.47 g·kg^-1),苣荬菜水煎液高、中、低剂量组(3.34,1.67,0.83 g·kg^-1),实验中监测血糖,并检测各组大鼠血清中超氧化物歧化酶(superoxide dismutase,SOD)活力,丙二醛(malondialdehyde,MDA)、谷光甘肽(glutathione,GSH)、一氧化氮(nitric oxide,NO)、总胆固醇(total cholesterol,TC)、低密度脂蛋白(low density lipoprotein,LDL)、高密度脂蛋白(high density lipoprotein,HDL)、甘油三酯(triglyceride,TG)、糖基化血清蛋白(glycosylated serum protein,GSP)、胰岛素(insulin,INS)、胰岛素抗体(insulin antibody,IAA)水平和一氧化氮合酶(nitricoxidesynthase,NOS)活力,并采用HE染色法观察大鼠胰腺和肾脏组织病理变化。结果与空白组相比,模型组大鼠血糖值及血清NOS活力,MDA、NO、TC、LDL、TG、GSP、IAA水平显著升高(P<0.01),SOD活力,GSH、HDL、INS水平显著降低(P<0.01);与模型组相比,二甲双胍组和苣荬菜水煎液组各剂量均可不同程度降低血糖水平,二甲双胍组与苣荬菜水煎液高剂量组可显著升高SOD活力,GSH、HDL、INS水平(P<0.01),显著降低NOS活力,MDA、NO、TC、LDL、TG、GSP、IAA水平(P<0.01或P<0.05),改善胰腺、肾脏的病理变化。结论苣荬菜水煎液具有较好的降血糖效果,其作用机制与促进胰岛β细胞释放胰岛素有关,并可修复胰岛细胞组织、保护肾脏。     

吡格列酮对糖尿病大鼠胰岛β细胞的保护作用分析

目的探讨吡格列酮对糖尿病大鼠胰岛β细胞的保护作用。方法将雄性Wistar大鼠30只随机抽取10只作为空白对照组,其余腹腔注射链脲佐菌素（STZ）建立糖尿病大鼠模型。将成模大鼠（20只）随机分为糖尿病对照组和吡格列酮组。吡格列酮组给予吡格列酮10mg·kg-1·d-1灌胃,其余2组给予等量生理盐水灌胃。16周后3组大鼠断尾测空腹血糖（FPG）,心包取血测空腹胰岛素水平（FINS）和糖化血红蛋白（HbAlc）。观察3组大鼠FPG、FINS、HbAlc、胰岛素抵抗指数（HOMA-IR）水平并比较。结果与糖尿病对照组相比,吡格列酮组FPG、HbAlc、FINS、HOMA-IR水平降低（P〈0.05）;糖尿病对照组、吡格列酮组FPG、HbAlc、FINS、HOMA-IR水平较空白对照组升高（P〈0.05）。结论吡格列酮对胰岛β细胞有一定的保护作用。     

小剂量阿司匹林对糖尿病大鼠胰腺功能和凋亡相关蛋白的研究

目的研究小剂量阿司匹林对糖尿病大鼠胰腺功能和凋亡相关蛋白的影响。方法雄性SD大鼠,尾静脉注射链脲佐菌素30mg/kg,造成1型糖尿病动物模型,随机分为糖尿病模型组和9 mg/kg阿司匹林治疗组(ASA治疗组),每组8只,另选8只健康雄性大鼠为正常对照组。各组大鼠灌服给药12周后,检测各组大鼠空腹血糖、血清胰岛素水平,免疫组化法检测分析Caspase-3、Bax和Bcl-2的表达情况。结果与正常对照组比较,糖尿病模型组大鼠空腹血糖提高、血清胰岛素水平降低,胰岛素抵抗指数升高;胰腺组织Caspase-3、Bax表达增强,Bcl-2的表达减弱,Bcl-2/Bax比值降低;ASA治疗组大鼠,血糖减低,胰岛素提高,减低Caspase-3、Bax表达,提升Bcl-2的表达,并明显提高Bcl-2/Bax比值。结论小剂量阿司匹林对糖尿病大鼠胰岛素分泌功能有保护作用,可能与调节胰腺细胞凋亡相关蛋白表达有关。     

Effect of Cymbopogon citratus Stapf extract on lipid profile and antioxidant status in streptozotocin-induced diabetic rats

OBJECTIVE To investigate the effects of Cymbopogon citratus Stapf water extract on lipid profile and antioxidant status in streptozotocin-induced diabetic rats.METHODS Diabetes was induced by injection of streptozotocin(STZ,50mg·kg-1)intraperitoneally.Diabetic rats were divided into 5groups,consisting of 6rats.GroupⅠ,reserved as diabetic control,was administered distilled water and groupⅡ,reserved as positive control,was administered glibenclamide(10mg·kg-1·d-1)throughout the duration of the experiment.Those in groupⅢ,ⅣandⅤ were administered 250,500 and 1000mg·kg-1·d-1 of the extract,respectively for 28 d.RESULTS Treatment with 500 and 1000mg·kg-1·d-1 of the extract resulted in reduction of serum AST,ALT,serum cholesterol,triglycerides and LDL,whereas HDL was found to be increased compared with diabetic control rats(P<0.05).Moreover,increased serum activities of superoxide dismutases and catalase were found in diabetic rats treated with the extract whereas serum thiobarbituric acid reactive substance was decreased,in comparison with diabetic control rat(P<0.05).CONCLUSION Cymbopogon citratus Stapf water extract provides a benefit effect on serum lipid and antioxidant effect in diabetic rats.Thus,the extract may lower cardiovascular disease risk and others complications related to hyperlipidemia and oxidative stress in diabetic patients.     

多次低剂量链脲佐菌素诱导大鼠糖尿病模型的方法学研究

目的分别探讨造模后不同时间点禁食、大鼠性别和多次低剂量链脲佐菌素(STZ)对大鼠血糖及糖尿病模型成模率的影响。方法分别一次性腹腔注射(ip)STZ 30 mg.kg-160、62、64 h后,于晚8时、10时、12时禁食,次日晨8时测大鼠空腹血糖,计算糖尿病(空腹血糖≥7.0 mmol.L-1)成模率;记录雌鼠和雄鼠一次性ip STZ 30 mg.kg-1后糖尿病的成模情况;首次分别ip STZ(20、25、30、40和50 mg.kg-1),不成模大鼠再次ip STZ(20 mg.kg-1),比较各组间糖尿病成模情况、血糖水平和6周内大鼠死亡情况。结果晚10时和12时禁食组糖尿病成模数(均为8只)较晚8时禁食组成模数(4只)增加1倍,成模大鼠血糖值进一步升高;雄鼠糖尿病成模数(7只)较雌鼠成模数(4只)增加将近1倍,成模大鼠血糖值进一步升高;首次分别腹腔注射STZ 25、30、40和50 mg.kg-1各组大鼠累计成模率明显高于首剂20 mg.kg-1组;首剂50 mg.kg-1组6周内成模大鼠死亡率明显高于首剂STZ 25和30 mg.kg-1组。结论测大鼠空腹血糖前于晚10～12时禁食优于晚8时禁食;采用雄鼠造模优于雌鼠;首剂采用STZ 25～30 mg.kg-1腹腔注射,未成模大鼠继续采用STZ 20mg.kg-1腹腔注射,糖尿病成模率高,死亡率低。     

黄芪-山药药对治疗2型糖尿病的尿液代谢组学研究

为了探讨黄芪-山药药对治疗2型糖尿病(T2DM)的作用机制,本研究首次应用氢核磁共振(1H NMR)尿液代谢组学方法研究了黄芪-山药药对对T2DM大鼠的代谢保护机制。将37只SD大鼠随机分为4个组:模型组M,对照组C,黄芪山药组HS,阳性对照组Y (二甲双胍)。利用高脂饲料喂养合并链脲佐菌素(STZ)诱导制备T2DM模型。造模后连续给药8周,随后取其血检测相关生化指标;取其肾脏检测肾脏系数。动物实验获得广东药科大学伦理委员会的批准。通过1H NMR代谢组学方法检测各组大鼠尿液中代谢物的变化,筛选出标志性代谢物。实验结果显示,与对照组比较,模型组大鼠总胆固醇(TC)、甘油三酯(TG)、低密度脂蛋白(L-DLC)、尿素氮(BUN)、糖化血红蛋白(HbA1c)及肾脏系数明显升高,高密度脂蛋白(H-DLC)水平显著降低(P<0.01),在黄芪-山药药对治疗后上述指标均有明显改善。模型组大鼠尿液中共发现20个标志性代谢物,黄芪山药治疗后可不同程度的逆转16个代谢物的变化,其效果与200 mg·kg-1二甲双胍相当。主要涉及丁酸代谢、三羧酸循环(TCA循环)、牛磺酸和亚牛磺酸代谢、酮体的合成与降解、丙酮酸代谢。提示黄芪-山药药对可能主要通过以上5条代谢通路对T2DM起到治疗作用,揭示了黄芪-山药药对对T2DM的治疗机制。     

阿司匹林对糖尿病模型大鼠血糖的影响

目的:探讨阿司匹林对高脂饲料喂养加链脲菌素所致糖尿病大鼠血糖的影响。方法:制备糖尿病大鼠模型,将其分为阿司匹林低剂量组、高剂量组,模型对照组和空白对照组(非糖尿病大鼠)。分别以20,80 mg.kg-1.d-1阿司匹林水溶液及生理盐水灌胃,14 d后测定小鼠空腹血糖、糖耐量、胰岛素释放。结果:大剂量阿司匹林能明显降低实验性糖尿病大鼠血糖(P<0.01),降糖率36.78﹪;能改善糖耐量(P<0.01),提高血清胰岛素含量(P<0.01)。结论:大剂量阿司匹林可降低血糖,改善糖耐量,促进胰岛素释放。     

低剂量他克莫司导致大鼠糖耐量异常机制的初步探讨

目的 初步探讨不同剂量他克莫司导致大鼠血糖升高的机制。方法 将 20只 SD大鼠随机分为低剂量组（0.1 mg/kg）、中剂量组（0.5 mg/kg）、高剂量组（1.0 mg/kg）、对照组 4组,每组 5只;前 3组每日皮下注射相应剂量的他克莫司,连续注射 1周,对照组给予等体积橄榄油。实验期间隔日监测动物体质量。药物干预 1周后行腹腔注射葡萄糖耐量试验（2 g/kg）,统计空腹血糖（FBG）、空腹胰岛素（FINS）和稳态模型下胰岛素抵抗指数（HOMA-IR）。摘取大鼠胰体尾部制备病理组织切片,免疫组化染色测量胰岛 β细胞面积,qPCR检测胰岛组织胰岛素分泌相关基因Epac、Rim2、Piccolo、Rab3a、Munck13的表达。结果 与对照组相比,他克莫司干预组体质量降低,中高剂量组的下降幅度 大于低剂量组。不同剂量他克莫司干预组均出现糖耐量异常,中、高剂量组血糖水平和曲线下面积均较低剂量组升高,且呈剂量依赖性（P＜0.05）。实验期间 4组间 FBG、FINS和 HOMA-IR比较差异无统计学意义（P＞0.05）。免疫组化染色结果显示中高剂量组 β细胞数量较低剂量组与对照组减少（P＜0.05）,低剂量组与对照组差异无统计学意义（P＞0.05）。低剂量组胰岛素分泌相关蛋白Epac、Rim2、Piccolo、Rab3a、Munck13转录水平均较对照组下降（P＜0.05）。结论 在胰岛 β细胞数量并未减少,且未出现胰岛素抵抗的情况下,小剂量他克莫司干预所引起的糖耐量异常与胰岛素分泌过程紊乱相关。     

Potency of Urena lobataleaves extract on the inhibition of vasculopathy on diabetic rats

OBJECTIVE To know the potency of Urena lobataleaves extract on the vasculopathy inhibition of diabetic rats.METHODS This study used control group post test only with male Sprague dawley rats.Diabetic rats were induced by high fructose diet(HFD)and single dose streptozotocin 25mg·kg-1 bw intra peritoneal.The rat was administrated orally with water extract of U.lobataleaves in dose of 250,500and1000mg·kg-1 bw for 4 weeks.After scarifying,blood sample were collected and then superoxyde dismutase(SOD)serum level,malondialdehyda(MDA),tumor necrosis factor-alpha(TNF-α)and circulating endothelial cells(CECs)were examined.The data was analyzed using ANOVA test continued with LSD test(P<0.05).RESULTS The oral administration of U.lobataleaves extract 250,500 and 1000mg·kg-1 bw were able to increase SOD serum level about 40%,70% and 100%respectively compared to diabetic group(P<0.05),while the MDA serum level was decreased by 20%,40%and 50%(P<0.05)respectively.The supplementation of water extract from U.lobatain dose of 250,500 and 1000mg·kg-1 bw also decrease TNF-αserum level approximately 40%,60% and 80% compared to control group(P<0.05),whereas the CECs level was decreased by 30%,50% and 70%(P<0.05)respectively.In diabetic groups,SOD serum level was decreased compared to normal group(P<0.05)while the MDA,TNF-αand CECs were increased(P<0.05).CONCLUSION U.lobata leaves extract could inhibit vasculopathy on diabetic rats by increasing of SOD serum level,decreasing of MDA serum level,TNF-αand CECs.This potency may be related to active substances which act as an anti-inflammatory and antioxidant in U.lobata extract.     

苦荞提取物对2型糖尿病大鼠胰岛细胞凋亡的干预作用

目的：探讨苦荞提取物对2型糖尿病大鼠胰岛细胞凋亡的干预作用.方法：Sprague-Dawley大鼠分为6组：正常对照组、模型组、二甲双胍组、苦荞提取物低、中、高剂量组.模型组和给药组采用高脂高糖诱导饮食.两周后,腹腔一次性注射链脲佐菌素（STZ,30 mg·kg^-1）建立大鼠2型糖尿病模型.二甲双胍组给予300 mg·kg^-1剂量灌胃,苦荞提取物组分别给予250 mg·kg^-1、500 mg·kg^-1、1 g·kg^-11苦荞提取物灌胃.给药4周后,检测大鼠空腹血糖值和空腹血清胰岛素（FINS）值,处死大鼠,取大鼠胰脏组织,H＆amp;E染色观察形态学变化;TUNEL法观察胰岛细胞凋亡;免疫组织化学法检测细胞死亡信号转导效应酶caspase-3在胰岛中的表达.结果：与模型组比,苦荞提取物组可显著降低大鼠空腹血糖值和空腹FINS值（P〈0.05）.HE结果显示苦荞提取物组和二甲双胍组大鼠胰岛形态未出现明显缩小及胰岛细胞减少情况,TUNEL结果显示苦荞提取物组与二甲双胍组胰岛中胰岛细胞凋亡均明显减少,caspase-3结果显示苦荞提取物组和二甲双胍组中caspase-3表达均有下调趋势（P〈0.05）.结论：苦荞提取物能够有效降低STZ诱导2型糖尿病大鼠胰岛细胞的凋亡.     

黄连温胆汤改善2型糖尿病大鼠糖脂代谢紊乱

目的:考察黄连温胆汤改善2型糖尿病引起的大鼠糖脂代谢紊乱作用。方法:通过60天高糖高脂饲料喂养合并一次性35 mg·kg-1链脲佐霉素(STZ)腹腔注射制备2型糖尿病大鼠模型,测定血糖,筛选模型成功大鼠。将该大鼠分为空白组、模型组、二甲双胍组(0.2 g·kg-1)和黄连温胆汤3、6、12 g·kg-1三个剂量组,连续给药30天。测定血清中空腹血糖(FBG)、血清胰岛素(FINS)、糖化血红蛋白(GHB)、胰岛素敏感系数(ISI)、胰岛素抵抗系数(IRI)、甘油三酯(TG)、总胆固醇(CHO)、低密度脂蛋白胆固醇(LDLC)和高密度脂蛋白胆固醇(HDLC),评估黄连温胆汤对大鼠糖脂代谢紊乱的调节作用。HE染色后观察胰腺病变。结果:黄连温胆汤能降低FBG、GHB,增加ISI,降低IR I;降低血清TG、CHO和LDLC含量,升高HDLC含量;但对FIN S作用不明显。此外,黄连温胆汤与模型组相比减轻了胰腺细胞变性,改善胰岛病变。结论:黄连温胆汤可以有效地改善2型糖尿病引起的糖脂代谢紊乱,保护胰腺细胞,其作用机制可能与改善胰岛素敏感性和胰岛素抵抗有关。     

Anti-hyperglycemic effect of ethanolic leaves extract,hexane and water of Urena lobata on diabetic rats induced by high fructose diets and streptozotocin

OBJECTIVE To investigate anti-hyperglycemic effect of ethanolic leaves extract,hexane and water of Urena lobata on diabetic rat induced by high fructose diets and streptozotocin.METHODS This study uses control group post test only with male spraque dawley rats.Diabetic rats was induced by high fructose diet(HFD)and single dose streptozotocin 25mg·kg-1 bw intra peritoneal.The rat was administrated orally with ethanolic leaves extract,hexane and water of U.lobatain concentrations of 500mg·kg-1 bw for 4weeks.Blood sample were collected from the tail vein at 0,15,30,60 and 120min after oral glucose administration and then blood glucose level were measured using a commercially available glucometer.The integrated area under the postprandial glucose curves(AUCs)was calculated by the trapezoidal method.Insulin serum level examined by rat insulin elisa kits.The data was analyzed using ANOVA test continued with LSD test(P<0.05).RESULTS The oral administration of ethanolic leaves extract,hexane and water of U.lobata were able to decrease glucose AUC about 40%,20% and 60% respectively compared to diabetic group(P<0.05),whereas the insulin level was increased by 2,2and 4-fold(P<0.05),respectively.In diabetic groups,glucose AUC was increased approximately 70% compared to normal group(P<0.05)while the insulin level were decreased by 14-fold(P<0.05).CONCLUSION U.lobataleaves extract could control the increase of blood glucose level after glucose administration by improve of insulin secretion.This effect may be related to active compounds that act as an anti-hyperglycemic and antioxidant in U.lobataleaves extract.     

Effect of Urena lobataleaves extract on glucagon like peptide-1 serum level by inhibition of dipeptidyl peptidase-Ⅳ on diabetic rats

OBJECTIVE To investigate effect of Urenalobataleaves extract on glucagon like peptide-1(GLP-1)serum level by inhibition of dipeptidyl peptidase-Ⅳ(DPP-Ⅳ)on diabetic rat. METHODS This study uses control group post test only with male spraque dawley rats.Diabetic rats was induced by High Fructose Diet(HFD)and single dose streptozotocin 25mg·kg-1 bw intra peritoneal.The rat was administrated orally with ethanolic extract of U.lobataleaves in dose of 250,500 and 1000mg·kg-1 for 4weeks.Blood sample were collected from the tail vein at 15 min after oral glucose administration and then DPP-Ⅳserum level and GLP-1were examined using a rat elisa kits of DPP-Ⅳ and GLP-1.The data was analyzed using ANOVA test continued with LSD test(P<0.05).RESULTS The oral administration of U.lobataleaves extract at dose of 250,500 and 1000mg·kg-1 bw were able to prolong GLP-1 bioavaibility approximately 5,2and 2.5-fold respectively compared to diabetic group(P<0.05),while the DPP-Ⅳ serum level was decreased by 60%,50% and 40%(P<0.05),respectively.In diabetic groups,DPP-Ⅳ serum level was increased more and less 4-fold compared to normal group(P<0.05)while the GLP level were decreased by 8-fold(P<0.05).CONCLUSION U.lobataleaves extract could prolong GLP-1 bioavaibility by reducing of DPP-Ⅳserum level.This effect may be related to active compounds that act as an DPP-Ⅳinhibitor in U.lobata extract.     

海带在四氧嘧啶糖尿病大鼠模型中的降糖作用

目的探讨海带在四氧嘧啶糖尿病模型大鼠中的降血糖作用及其机制。方法健康♂Wistar大鼠60只,随机取10只作为对照组,其余50只腹腔注射四氧嘧啶建立高血糖动物模型,饲料中添加含有海带的饲料喂养干预治疗,分为低(2.5 g.kg-1)、中(10 g.kg-1)和高(25 g.kg-1)3个剂量组。自动血糖仪测大鼠空腹血糖(FBG),酶联免疫吸附法检测血清胰岛素(Insulin)水平,硫代巴比妥酸法检测血清脂质过氧化物丙二醛(MDA)含量,硝酸还原酶法检测血清一氧化氮(NO)含量,黄嘌呤氧化酶法测定血清超氧化物歧化酶(SOD)活性,化学比色法测定谷胱甘肽过氧化物酶(GSH-Px)活性。结果经海带治疗后,动物血清胰岛素水平较模型组升高(P<0.05),中、高剂量组动物FBG水平较模型组降低(P<0.05);其血清MDA和NO水平低于模型组,而血清SOD和GSH-Px活性高于模型组,其中中、高剂量组与模型组比较差异有显著性(P<0.05)。各指标在中剂量与高剂量组之间差异无显著性(P>0.05)。结论海带可通过增强机体的抗氧化作用,促进胰岛细胞分泌功能恢复而发挥降血糖作用,其理想剂量为每日10 g.kg-1。     

养阴益气活血法改善2型糖尿病胰岛素抵抗的机制研究

目的观察具有养阴益气活血作用的中药复方制剂参丹健胰丸对2型糖尿病模型大鼠胰岛素抵抗的改善作用,并探讨其机理。方法采用高热量饲料加小剂量链脲佐菌素建立类似于2型糖尿病胰岛素抵抗的大鼠模型,通过设立正常对照组、模型对照组、参丹健胰丸1 080 mg·kg^-1治疗组、参丹健胰丸540 g·kg^-1治疗组、二甲双胍治疗组和参芪降糖颗粒组,观察各组大鼠治疗前后空腹血糖（FBG）、血清胰岛素水平（Fins）、胰岛素敏感指数（ISI）、血清C反应蛋白（CRP）、血浆纤溶酶原激活物抑制物（PAI-1）、血清游离脂肪酸（FFA）以及血清肿瘤坏死因子（TNF-α）水平。结果参丹健胰丸组大鼠FBG、血浆PAI-1活性及血清Fins、CRP、FFA、TNF-α含量均较模型组大鼠明显降低（P〈0.05或P〈0.01）,ISI明显增加（P〈0.05或P〈0.01）。结论养阴益气活血中药复方参丹健胰丸对2型糖尿病大鼠胰岛素抵抗具有一定的改善作用。