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茯苓多糖调节2型糖尿病模型大鼠肝脏糖异生的机制研究                                                                Δ


        韩思婕 ,潘 翔,朱芊芊,张丹丹,张涵瑞,方敬贤,魏 琼,刘 丹,叶晓川(湖北中医药大学药学院/中药资源
                                                                           #
              *
        与中药化学湖北省重点实验室,武汉 430065)


        中图分类号 R965          文献标志码 A          文章编号 1001-0408(2022)13-1581-07
        DOI  10.6039/j.issn.1001-0408.2022.13.08

        摘  要   目的 探讨茯苓多糖通过磷脂酰肌醇3-激酶(PI3K)/蛋白激酶B(Akt)/叉头框转录因子O1(FoxO1)通路调节2型糖尿病模
        型大鼠血糖的作用和机制。方法 将SD大鼠随机分为空白对照组(不造模、不给药)、模型组(造模、不给药)、二甲双胍组(造模,
        200 mg/kg)和茯苓多糖低、中、高剂量组(造模,100、200、400 mg/kg),每组8只。除空白对照组外,其余各组采用高脂饲料联合链
        脲佐菌素构建2型糖尿病大鼠模型。于造模同时,各给药组大鼠灌胃相应剂量的药物,空白对照组和模型组大鼠灌胃等体积水,
        每日1次,连续灌胃42 d。实验期间,每日观察大鼠日常状况和体质量变化。给药结束前1 d采集大鼠空腹血糖,进行口服葡萄糖
        耐量试验并计算曲线下面积(AUC);末次给药后,计算大鼠心脏、肝脏、肾脏脏器指数;检测糖化血红蛋白(HbA1c)、总胆固醇
       (TC)、三酰甘油(TG)、丙二醛(MDA)、超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)水平及肝糖原含量;采用苏木精-
        伊红染色观察大鼠肝脏和胰腺组织病理形态学变化并计算病理等级评分;采用 Western blot 法检测大鼠肝脏磷酸化 PI3K
       (p-PI3K)、磷酸化Akt(p-Akt)、磷酸化FoxO1(p-FoxO1)、磷酸烯醇丙酮酸羧化激酶(PEPCK)、葡萄糖-6-磷酸酶(G6Pase)蛋白表达
        水平。结果 与空白对照组比较,模型组大鼠出现多饮、多食、多尿症状,体质量、SOD、GSH-Px水平和p-PI3K、p-AKT、p-FoxO1蛋
        白表达水平均显著降低(P<0.05);大鼠肝脏、肾脏脏器指数,灌胃葡萄糖溶液 0、0.5、2 h 时的血糖水平、AUC,空腹血糖水平、
        HbA1c水平,血清中MDA、TC、TG、肝糖原含量,肝脏、胰腺病理等级评分,PEPCK、G6Pase蛋白表达水平均显著升高(P<0.05)。
        与模型组比较,茯苓多糖各剂量组大鼠日常情况均有所改善,以上指标均有不同程度的逆转。结论 茯苓多糖可以通过减弱氧化
        应激,上调PI3K/Akt/FoxO1通路,从而下调糖异生关键酶PEPCK和G6Pase的蛋白表达,抑制肝脏糖异生,进而有效降低2型糖尿
        病模型大鼠的血糖水平,调节糖脂代谢。
        关键词 茯苓多糖;2型糖尿病;氧化应激;PI3K/Akt/FoxO1通路;糖异生

        Study on the mechanism of Poria cocos polysaccharides on the regulation of gluconeogenesis in liver of
        type 2 diabetic mellitus model rats
        HAN Sijie,PAN Xiang,ZHU Qianqian,ZHANG Dandan,ZHANG Hanrui,FANG Jingxian,WEI Qiong,LIU
        Dan,YE Xiaochuan(College of Pharmacy/Hubei Provincial Key Laboratory of Chinese Medicine Resource and
        TCM Chemistry,Hubei University of TCM,Wuhan 430065,China)

        ABSTRACT    OBJECTIVE To investigate the effect and mechanism of Poria cocos polysaccharides on the regulation of blood
        glucose in type 2 diabetes mellitus(T2DM)model rats by phosphatidylinositol 3-kinase(PI3K)/protein kinase B(Akt)/forked box
        transcription factor O1(FoxO1)pathway. METHODS SD rats were randomly divided into blank control group(no modeling,no
        administration),model group(modeling,no administration),metformin group(modeling,200 mg/kg)and P. cocos polysaccharide
        low-dose,medium-dose and high-dose groups(modeling,100,200,400 mg/kg),8 in each group. Except for blank control group,
        other groups were given high fat diet combined with streptozotocin to construct the model of T2DM rats. At the same time,
        administration groups were given relevant dose of medicine intragastrically,and blank control group and model group were given
        constant volume of water intragastrically,once a day,for consecutive 42 days. During the experiment,general condition and
        bodyweight of rats were observed every day;fasting blood glucose(FBG)of rats were collected,and oral glucose tolerance test were
        conducted and area under curve(AUC)was calculated the day before last administration. After last medication,the heart,liver,
        kidney organ index were calculated;the levels of HbA1c,TC,TG,MDA,SOD,GSH-Px and hepatic glycogen content were
                                                           detected. HE staining was used to observe the pathological
           Δ 基金项目 国家重点研发计划项目(No.2017YFC1703004);湖北         changes of liver and pancreatic tissue,and the pathological
        省技术创新专项——重大项目(No.2019ACA121)
                                                           grade score was calculated. Western blot assay was used to
           *第一作者 硕士研究生。研究方向:中药及其制剂的药效和物质
                                                           detect the protein expressions of p-PI3K,p-Akt,p-FoxO1,
        基础。E-mail:843228181@qq.com
                                                           PEPCK and G6Pase in liver tissues. RESULTS Compared
           # 通信作者 教授,博士生导师,博士。研究方向:中药及其制剂的
        物 质 基 础 、中 药 新 产 品 研 发 。 电 话 :027-68890101。 E-mail:yxx-  with blank control group,the rats of model group suffered
        cc1965@163.com                                     from polydipsia,polyphagia and polyuria;the body weight,


        中国药房    2022年第33卷第13期                                             China Pharmacy 2022 Vol. 33 No. 13  ·1581 ·
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