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北京中医药大学 中药学院,北京 102488
Received:30 September 2021,
Published Online:17 November 2021,
Published:20 September 2022
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姚妮,王楚茵,赵希彤等.芦荟大黄素对Al3+存在下Aβ42聚集和细胞增殖抑制作用的影响[J].中国实验方剂学杂志,2022,28(18):99-107.
YAO Ni,WANG Chuyin,ZHAO Xitong,et al.Effect of Aloe-emodin on Aβ42 Aggregation and Cytotoxicity in Presence of Al3+[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(18):99-107.
姚妮,王楚茵,赵希彤等.芦荟大黄素对Al3+存在下Aβ42聚集和细胞增殖抑制作用的影响[J].中国实验方剂学杂志,2022,28(18):99-107. DOI: 10.13422/j.cnki.syfjx.20212153.
YAO Ni,WANG Chuyin,ZHAO Xitong,et al.Effect of Aloe-emodin on Aβ42 Aggregation and Cytotoxicity in Presence of Al3+[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(18):99-107. DOI: 10.13422/j.cnki.syfjx.20212153.
目的
2
在体外研究芦荟大黄素(AE)对金属铝离子(Al
3+
)诱导的
β
-淀粉样蛋白42(A
β
42
)聚集的抑制作用,以及对已形成的A
β
42
-Al
3+
聚集体的解聚作用,并考察其对Al
3+
存在下A
β
42
聚集产生的细胞增殖抑制作用的影响。
方法
2
设置A
β
42
组、A
β
42
+Al
3+
组、A
β
42
+AE组、A
β
42
+Al
3+
+AE组,以及解聚作用考察实验,应用硫黄素T(ThT)荧光试验、透射电子显微镜(TEM)、动态光散射法(DLS)及噻唑蓝(MTT)细胞增殖抑制作用试验分别检测各组A
β
42
的聚集纤维化过程、聚集体形貌、聚集体尺寸及细胞增殖抑制作用。
结果
2
与A
β
42
组比较,Al
3+
可促进A
β
42
聚集,使ThT荧光强度升高至124.48%,诱导A
β
42
聚集形成粒径较大的纤维束,并显著降低人神经母细胞瘤细胞SH-SY5Y的细胞活力(
P
<
0.01),使细胞生存率降低至51.05%。AE不仅能抑制A
β
42
聚集,而且可浓度依赖性地抑制Al
3+
诱导的A
β
42
聚集;与A
β
42
+Al
3+
组比较,高浓度AE使ThT荧光强度降低至41.66%,改变多肽聚集途径形成粒径较小的无定型结构聚集体,并显著抑制Al
3+
诱导A
β
42
产生的细胞增殖抑制作用(
P
<
0.01),使细胞生存率恢复至84.87%。解聚研究发现,AE可解聚A
β
42
-Al
3+
聚集体,使已形成的聚集体消失,形成一些毒性较低的小粒径短纤维及无定型结构聚集体。
结论
2
AE可抑制Al
3+
存在下的A
β
42
聚集及细胞增殖抑制作用,解聚已形成的A
β
42
-Al
3+
聚集体,缓解其产生的细胞增殖抑制作用,为探索AE治疗阿尔茨海默病的作用机制奠定基础。
Objective
2
To study the inhibitory effect of aloe-emodin (AE) on aluminum ion (Al
3+
)-induced
β
-amyloid protein 42 (A
β
42
)
aggregation and its depolymerization on formed A
β
42
-Al
3+
aggregates
in vitro
, and to investigate the effect of AE on the cytotoxicity of A
β
42
aggregation in the presence of Al
3+
.
Method
2
The A
β
42
group, A
β
42
+Al
3+
group, A
β
42
+AE group, A
β
42
+Al
3+
+AE group and the depolymerization test group were set up in the experiment. The aggregation fibrosis process, aggregation morphology, aggregation size and cytotoxicity of A
β
42
in each group were detected by thioflavin T (ThT) fluorescence assay, transmission electron microscopy (TEM), dynamic light scattering (DLS) experiment and thiazolyl blue (MTT) cytotoxicity assay.
Result
2
Compared with the A
β
42
group, Al
3+
could promote A
β
42
aggregation, increase the fluorescence intensity of ThT by 124.48%, induce the aggregation of A
β
42
to form fiber bundles with larger particle size, and significantly reduce the cell viability of human neuroblastoma SH-SY5Y cells (
P
<
0.01), thus reducing the cell survival rate to 51.05%. AE not only inhibited A
β
42
aggregation, but also inhibited Al
3+
-induced A
β
42
aggregation in a concentration-dependent manner. Compared with the A
β
42
+Al
3+
group, high concentration of AE could reduce the ThT fluorescence intensity to 41.66%, and change the polypeptide aggregation pathway to form amorphous aggregates with small particle size. Besides, it significantly inhibited the cytotoxicity of A
β
42
induced by Al
3+
(
P
<
0.01), and restored the cell survival rate to 84.87%. Further depolymerization was conducted, AE could depolymerize A
β
42
-Al
3+
aggregates to make the formed aggregates disappear and form some small-particle short fibers and amorphous structure aggregates with low toxicity.
Conclusion
2
AE can inhibit A
β
42
aggregation and cytotoxicity in the presence of Al
3+
, depolymerize the formed A
β
42
-Al
3+
aggregates and alleviate the cytotoxicity, thus laying the foundation for exploring the mechanism of AE in the treatment of Alzheimer's disease.
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