糖基化终末产物诱导心肌细胞老化的机制
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江苏省科技厅自然科学基金(BK2011382);江苏省“六大人才高峰”(2011WSN-029);江苏省卫生厅科技项目(Z201301)


Mechanisms of advanced glycation end products induced cardiomyocytes aging
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    目的:研究糖基化终末产物(advanced glycation end products,AGEs)诱导心肌细胞老化的机制。方法:AEGs-抗AGE受体(RAGE)抗体干预乳鼠心肌细胞48 h。通过Western blot和β-半乳糖苷酶(SA-β-Gal)染色分别检测老化相关蛋白p53-p16的表达及SA-β-Gal活性;采用JC-1-DCFH-DA分别测定线粒体膜电位-细胞内活性氧(reactive oxygen species,ROS);通过Western blot检测自噬相关蛋白LC3-Beclin1。结果:AGEs干预细胞48 h后与对照组相比,AGEs组SA-β-Gal活性明显增高,p53-p16的表达量明显增加(P < 0.01),同时伴随线粒体膜电位的降低(P < 0.01)及细胞内ROS水平增加(P < 0.01),LC3与Beclin1表达量明显增加(P均 < 0.01);给予抗RAGE抗体干预后与AGEs组相比,SA-β-Gal活性降低,p53-p16的表达量明显降低(P < 0.01),线粒体膜电位增高(P < 0.01),细胞内ROS减少(P < 0.01),LC3与Beclin1表达量降低(P < 0.05和P < 0.01)。结论:AGEs与其受体RAGE作用可能通过氧化应激及线粒体损伤与自噬诱导心肌细胞老化。

    Abstract:

    Objective:To study the mechanisms of cardiomyocytes aging induced by advanced glycation end products. Methods:Neonatal rat cardiac myocytes were cultured with AGEs,anti-RAGE antibody for 48 h. Senescence-associated beta galactosidase (SA-β-Gal) activity was observed via SA-β-Gal assay in neonatal rat cardiomyocytes. p53,p16,LC3 and Beclin1 were measured by Western blot. We observed mitochondrial membrane potential and the generation of reactive oxygen species(ROS) by JC-1 and DCFH-DA methods. Results:After intervention for 48 h with AGEs,SA-β-Gal activity and the expression of p53(P < 0.01),p16(P < 0.01),LC3(P < 0.01) and Beclin1(P < 0.01) were significantly increased in the AGEs group compared to that of the control group,accompanied by the significantly decrease of mitochondrial membrane potential (P < 0.01) and remarkably increase of ROS(P < 0.01). After treated with anti-RAGE antibody,SA-β-Gal activity and the level of p53(P < 0.01),p16 (P < 0.01),LC3 (P < 0.05)and Beclin1(P < 0.01)were remarkably decreased compared with the AGEs group. However,inhibition of RAGE with anti-RAGE antibody remarkably increased mitochondrial membrane potential(P < 0.01) and significantly decreased ROS compared with AGEs group(P < 0.01).Conclusion:AGEs-RAGE may induce aging of cardiomyocytes by mitochondrial damage,the generation of ROS and autophagy.

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李世玲,郭聪娴,王俊宏,郭 妍.糖基化终末产物诱导心肌细胞老化的机制[J].南京医科大学学报(自然科学版),2015,(8):1066-1071

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  • 收稿日期:2014-09-13
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  • 在线发布日期: 2015-08-04
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