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to October 2021. T2DM model was established for three groups(except for group C)using intraperitoneal injection of STZ. Then
drug was administered by intragastric administration to the groups as follows:equal amount of 0.9% sodium chloride solution for
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group C,metformin (200 mg·kg ·d ) for group M,metformin (200 mg·kg ·d ) suspension+rosuvastatin calcium (0.42
-1
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mg·kg ·d ) for group M+RL,and metformin (200 mg·kg ·d ) suspension+rosuvastatin calcium (0.83 mg·kg -1
-1
·d ) for group M+RH. Rats were sacrificed after 6 weeks of intervention,while their blood and kidney tissues were collected.
The extent of injury of kidney tissues was observed under light microscope after being stained with H&E,and was analyzed
using Image-Pro Plus 6.0 after being stained with periodic-acid schiff,and Masson's trichrome,respectively. The expression
of glucose transporter 4(GLUT4) mRNA in the renal tissue was measured by real-time polymerase chain reaction(PCR),
and the protein levels of GLUT4 were detected by Western-blotting. Results Compared with group C,the glomerulus of rats in
other three groups showed significant structural damage,accompanied by inflammatory cell infiltration and interstitial fibrosis.
Moreover,mRNA expression levels of GLUT4 in these groups were significantly lowered(P<0.05). Furthermore,the protein
levels of GLUT4 in groups M and M+RL were lowered notably(P<0.05). The mRNA and protein expression levels of GLUT4 in
group M+RL or M+RH were higher than those of group M(P<0.05). In addition,the mRNA and protein expression levels of
GLUT4 in M+RH group were higher than those in M+RL group(P<0.05). Conclusion Rosuvastatin calcium with metformin
could reduce inflammatory cell infiltration in glomerular and tubular,alleviate glomerular basement membrane thickening and
tubular vacuolar degeneration,delay the interstitial fibrosis development,and increase GLUT4 mRNA and GLUT4 protein
expression in STZ-induced T2DM rats. Moreover,higher dose of rosuvastatin calcium showed better effect. Our study indicated
that rosuvastatin calcium combined with metformin may achieve a renoprotective effect by regulating the expression of GLUT4
mRNA and protein in T2DM rats,and this effect may be enhanced with the increase in the dose of rosuvastatin calcium.
【Key words】 Diabetes mellitus,type 2;Rats;Renal protection;Kidney diseases;Rosuvastatin calcium;
Metformin;Glucose transporter 4
近年来,随着经济发展、老年人比例的增加及超重、
本研究价值:
肥胖等患病率的增加,我国 2 型糖尿病(T2DM)发病 (1)目前糖尿病的发病率不断增加,各类药物
率显著上升 [1] 。血管内皮细胞损伤、炎性反应、氧化 对肾脏的影响亟须获得更高程度的关注,然而他汀类
应激和胰岛素抵抗等是 T2DM 发展的独立危险因素 [2] 。
药物对肾脏的保护作用还未得到充分研究,尤其现在
瑞舒伐他汀钙是一种强效的降脂药物,亲水性优于其他
关于他汀类药物是否引发新发糖尿病还存在一定争
同类药物,对肝脏损害较小。有研究表明,瑞舒伐他汀
议。本研究通过动物实验发现瑞舒伐他汀钙联合二甲
钙对肾脏同样具有保护作用,可降低炎性因子水平、改 双胍对 2 型糖尿病(T2DM)大鼠肾脏具有保护作用,
善血管内皮功能、抗氧化及提高胰岛素敏感性 [3-4] 。二
可能与调控肾脏葡萄糖转运蛋白 4(GLUT4)mRNA
甲双胍是临床治疗 T2DM 的常见药物,可通过激活腺苷
及蛋白的表达有关。
酸活化蛋白激酶(AMPK),保护肾小管细胞免受炎症、
(2)本研究通过研究不同剂量瑞舒伐他汀钙联
凋亡、活性氧(ROS)应激、内质网(ER)应激、上皮 - 间
合二甲双胍对 T2DM 大鼠肾脏的组织学(HE 染色、
充质转化(EMT)的影响,还具有抑制系膜细胞凋亡和 PAS 染 色、Masson 染色)变化及 GLUT4 mRNA、
肾小管细胞衰老的作用 [5] 。章超等 [6] 研究发现,瑞舒
GLUT4 蛋白表达的影响,发现其可通过改善胰岛素
伐他汀联合二甲双胍能改善 T2DM 患者血糖、血脂水平,
抵抗、氧化应激、肾脏纤维化、抑制细胞凋亡等作用
控制炎性反应,缓解胰岛素抵抗(insulin resistance,
保护肾脏,从蛋白与 mRNA 角度观察剂量与肾脏病
IR),具有重要的临床价值。本研究观察了瑞舒伐他
理性改变的关系,且保护作用与药物剂量呈正相关。
汀钙联合二甲双胍对链脲佐菌素(STZ)诱导的 T2DM
大鼠肾脏组织结构学、葡萄糖转运蛋白 4(GLUT4) 中国人民解放军联勤保障部队第九六〇医院动物饲养
mRNA 及蛋白表达的影响,以探讨其在 T2DM 大鼠肾脏 中心〔SYXK(鲁)2012-0043〕,将大鼠饲养于室温
损伤中的保护作用及机制。 21~25 ℃、空气流通的环境中进行 1 周的适应性饲养。
1 材料与方法 本实验由中国人民解放军联勤保障部队第九六〇医院伦
1.1 实验动物 2021 年 7—10 月选用清洁级健康雄性 理委员会审查通过(20210123)。动物饲料由北京博泰
Wistar 大 鼠 40 只,8 周 龄, 体 质 量(200±20)g, 购 宏达生物技术有限公司配制,主要营养成分:蛋白质
于济南朋悦实验动物繁育有限公司〔SCXK(鲁)2019- 24.2%,碳水化合物 42.1%,脂肪 25.4%。
0003〕,动物合格证号:370726210100677087,饲养于 1.2 实验药物及试剂 瑞舒伐他汀钙(商品名:可定),