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610072 成都,四川省人民医院肾内科,电子科技大学医学院四川省肾脏疾病临床研究中心
[ 丁涵露, E-mail: dhanlu@163.com DING Hanlu, E-mail: dhanlu@163.com
收稿:2020-07-12,
修回:2020-09-07,
纸质出版:2021-01-30
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汪伟, 李怡, 吴松, 等. 干预血栓调节蛋白表达对糖尿病肾病肾损伤的影响[J]. 第三军医大学学报, 2021,43(2):156-162.
Wei WANG, Yi LI, Song WU, et al. Effect of modulating thrombomodulin expression on renal injury in rats with diabetic nephropathy[J]. Journal of Third Military Medical University, 2021, 43(2): 156-162.
汪伟, 李怡, 吴松, 等. 干预血栓调节蛋白表达对糖尿病肾病肾损伤的影响[J]. 第三军医大学学报, 2021,43(2):156-162. DOI: 10.16016/j.1000-5404.202007105.
Wei WANG, Yi LI, Song WU, et al. Effect of modulating thrombomodulin expression on renal injury in rats with diabetic nephropathy[J]. Journal of Third Military Medical University, 2021, 43(2): 156-162. DOI: 10.16016/j.1000-5404.202007105.
目的
2
探讨干预血栓调节蛋白(thrombomodulin,TM)表达对糖尿病肾病(diabetic nephropathy,DN)肾损伤的影响及可能机制。
方法
2
① 利用免疫组化检测25例DN患者肾组织以及6例正常肾组织中肝X受体-α(liver X receptor-α,LXR-α)、TM、凝血因子XⅢ- A(FXⅢ-A)和CD163表达;②在明确LXR-α激动剂T0901317上调db/db小鼠TM表达及TM干扰RNA(Ad-TM shRNA)下调TM表达作用后,将12周龄雄性db/db小鼠分为4组(
n
=6):DN生理盐水组、Ad-ctrl+DN组、T0901317+DN组、Ad-TM shRNA+DN组,C57BL6野生小鼠作为正常对照组。上述5组给药4周后,Western blot、免疫组化观察干预TM表达对肾组织TM、LXR-α、FXⅢ-A、CD163表达的影响,ELISA检测血炎症介质(TNF-α、IL-6)以及尿微量白蛋白的变化。
结果
2
DN患者肾组织TM、LXR-α表达量较对照组下降,且与肾小球滤过率正相关(
P
<
0.05);而FXⅢ-A和CD163表达较对照组升高,且与肾小球滤过率负相关(
P
<
0.05)。动物实验显示:DN生理盐水组与野生小鼠对照组相比、Ad-TM shRNA组与DN对照组相比,均表现为尿微量白蛋白和血TNF-α、IL-6水平上升、肾组织TM和LXR-α表达减少、FXⅢ-A和CD163表达增加(
P
<
0.05),而T0901317+DN组较DN对照组,上述指标改善。
结论
2
表达上调的TM可能通过抑制肾组织FXⅢ-A、CD163表达以及下调血炎症介质水平而改善db/db小鼠尿蛋白水平。
Objective
2
To investigate the effect of modulating thrombomodulin (TM) expression on renal injury in a rat model of diabetic nephropathy (DN) and explore the possible mechanism.
Methods
2
We examined the expression of liver X receptor-α (LXR-α)
TM
coagulation factor XⅢ-A (FXⅢ-A) and CD163 in 25 renal biopsy samples from patients with DN and in 6 normal renal tissue specimens using immunohistochemistry. Twenty-four 12-week-old male db/db mice with DN were randomly assigned into 4 equal groups and treated daily with intragastric administration of normal saline or LXR-α agonist T0901317
or with intravenous injection of an adenoviral vector carrying TM shRNA or the control adenoviral vector for 7 consecutive days; 6 wild-type C57BL6 mice with intragastric saline treatment served as the normal control group. Four weeks after the treatment
the expression of TM
LXR-α
FXⅢ-A and CD163 in the renal tissues of the mice were detected using Western blotting
the levels of tumor necrosis factor-α (TNF-α) and interleukine-6 (IL-6) were detected by ELISA
and the urinary microalbumin level was determined.
Results
2
The renal expression levels of TM and LXR-α were decreased (
P
<
0.05) and those of FXⅢ-A and CD163 were increased significantly (
P
<
0.05) in the kidney tissues of DN patients compared with normal kidney tissues. In db/db mouse model of DN
the expression levels of TM and LXR-α were positively correlated while those of FXⅢ-A and CD163 were negatively correlated with glomerular filtration rate (
P
<
0.05). Compared with the wild-type mice
the mouse model of DN showed significantly increased urinary microalbumin levels and serum levels of TNF-α and IL-6
lowered renal expressions of TM and LXR-α
and increased renal expression of FXⅢ-A and CD163; these changes were further exacerbated in the mice treated with Ad-TM shRNA (
P
<
0.05) but significantly improved in the mouse models treated with T0901317.
Conclusion
2
Upregulating TM expression can reduce urinary microalbumin level in db/db mouse model of DN by inhibiting the renal expression of FXⅢ-A and CD163 and downregulating blood levels of inflammatory mediators.
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