老年肥胖食蟹猴糖尿病动物模型的建立
发布时间:2019-03-02 16:13
【摘要】: 目的 糖尿病(Diabetes Mellitus,DM)是一种内分泌代谢失常性疾病,发病率高,难根治、并发症多。目前糖尿病已成为仅次于肿瘤和心血管疾病之后列到第三大危害人类的疾病,但以病患者为直接研究对象进行科学研究受到诸多因素的制约,尤其是伦理学方面的限制。故有必要建立糖尿病动物模型来开展相关的基础性和应用研究。 本研究拟建立猴Ⅰ型糖尿病动物模型。而Ⅰ型糖尿病造模方法有手术、化学损伤诱导、和病毒诱导等,其中最常用的是链脲佐菌素(STZ)。目前国内外已经建立的猴Ⅰ型糖尿病动物模型均未考虑肥胖、年龄等糖尿病易感因素,本研究拟在研究中引入上述因素,同时探讨猴糖尿病的系统诊断标准。主要用于Ⅰ型糖尿病造模的动物有大鼠、小鼠、猴等。大鼠、小鼠价格便宜,但与人类遗传差异差异较大。如胰岛淀粉样多肽(LAPP)作为胰岛淀粉样物的特有成分是由37个氨基酸组成的多肽,主要是由胰岛β细胞分泌。LAPP作为与糖尿病关系密切的物质仅在人、猴、猫、浣熊存在。 方法 本课题以食蟹猴为对象,选用8只13岁以上的老年雄性肥胖食蟹猴分为模型组、对照组,模型组禁食16小时后一次性静脉注射STZ(临用前由0.1mmol/l、pH4.2-4.5柠檬酸缓冲液配成1%浓度),剂量为45mg/kg;对照猴同样禁食16小时后一次性静脉注射0.1mmol/l、pH4.2-4.5柠檬酸缓冲液,剂量为45mg/kg。定时检测动物血糖、尿糖、GAD-Ab、C肽、静脉葡萄糖耐量试验(Ⅳ.GTT)和详细记录动物的摄食量、饮水量、排尿量及体重的变化等与糖尿病相关的临床指标,并对动物进行组织病理学检查。 结果 模型猴造模后摄食、饮水、尿量均比未给药前有明显升高,有统计学意义(P<0.05),空腹血糖从造模后第二周开始明显升高,此外尿糖也在造模后第二周由阴性变为2000mmol/L,糖耐量第5周由造模开始的正常状态变为糖耐量异常。造模后第七周C肽(衡量胰岛细胞功能的重要指标)明显降低,GAD—Ab(Ⅰ型糖尿病患者最早出现的自身抗体)由阴性变为阳性。精神状况、甘油三脂、总胆固醇没有显著变化。而对照猴摄食、饮水、尿量或者无明显变化,或者仅有少量下降,血糖、尿糖、糖耐量正常。 结论 本研究通过STZ人工诱导食蟹猴,建立了诱发性Ⅰ型糖尿病动物模型。同时研究显示食蟹猴糖尿病的诊断标准:(1)空腹血糖≥8.0mmol/L且持续3周以上。空腹指至少8h未进食。(2)葡萄糖耐量试验中,葡萄糖负荷后2h血糖≥10.0mmol/L。具有以上二条之一皆可视为动物已患有糖尿病,若动物C肽下降、GAD—Ab变为阳性,则可认为此糖尿病为Ⅰ型。
[Abstract]:Objective Diabetes mellitus (Diabetes Mellitus,DM) is an endocrine metabolic disorder with high incidence, difficult to cure and many complications. At present, diabetes has become the third most harmful disease after tumor and cardiovascular disease. However, the scientific research on patients with diabetes is restricted by many factors, especially in ethics. Therefore, it is necessary to establish diabetic animal model to carry out related basic and applied research. The animal model of type I diabetes mellitus in monkeys was established in this study. The methods of modeling type I diabetes include surgery, chemical injury induction, and viral induction. Among them, streptozotocin (STZ). Is the most commonly used method. The animal models of type 鈪,
本文编号:2433222
[Abstract]:Objective Diabetes mellitus (Diabetes Mellitus,DM) is an endocrine metabolic disorder with high incidence, difficult to cure and many complications. At present, diabetes has become the third most harmful disease after tumor and cardiovascular disease. However, the scientific research on patients with diabetes is restricted by many factors, especially in ethics. Therefore, it is necessary to establish diabetic animal model to carry out related basic and applied research. The animal model of type I diabetes mellitus in monkeys was established in this study. The methods of modeling type I diabetes include surgery, chemical injury induction, and viral induction. Among them, streptozotocin (STZ). Is the most commonly used method. The animal models of type 鈪,
本文编号:2433222
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