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贵州中医药大学第一附属医院肾内科,贵阳 550001
黄宁川,Email:Toner200908@163.com,研究方向:原发与继发性慢性肾脏病。
收稿:2023-04-13,
修回:2023-08-29,
录用:2023-09-11,
纸质出版:2025-06-28
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黄宁川,马辉,马鹏.Sp1/ABCA1信号通路在尿毒症动脉粥样硬化中的作用及其调节机制[J].重庆医科大学学报,2025,50(6):808-814.
Huang Ningchuan,Ma Hui,Ma Peng.Role of Sp1/ABCA1 signaling pathway in uremic atherosclerosis and its regulatory mechanism[J].Journal of Chongqing Medical University,2025,50(6):808-814.
黄宁川,马辉,马鹏.Sp1/ABCA1信号通路在尿毒症动脉粥样硬化中的作用及其调节机制[J].重庆医科大学学报,2025,50(6):808-814. DOI: 10.13406/j.cnki.cyxb.003661.
Huang Ningchuan,Ma Hui,Ma Peng.Role of Sp1/ABCA1 signaling pathway in uremic atherosclerosis and its regulatory mechanism[J].Journal of Chongqing Medical University,2025,50(6):808-814. DOI: 10.13406/j.cnki.cyxb.003661.
目的
2
探讨特异性蛋白1(specificity protein 1,Sp1)/三磷酸腺苷结合盒转运蛋白A1(adenosine triphosphate-binding cassette transporter A1,ABCA1)信号通路在尿毒症动脉粥样硬化中的作用及其调节机制。
方法
2
小鼠血管平滑肌细胞(vascular smooth muscle cells,VSMCs)分为对照(Con)组、吲哚酚硫酸盐(indophenol sulfate,IS)组、IS+Sp1组和IS+Sp1+sh-ABCA1组。Con组用0.1%二甲基亚砜(Dimethyl sulfoxide,DMSO)处理24 h,其他组加入250 nmol/L IS处理24 h。通过蛋白质印迹分析和DiI标记氧化型低密度脂蛋白(DiI-labeled oxidized low density lipoprotein,DiI-ox-LDL)染色分析Sp1/ABCA1蛋白表达和脂质积聚情况。80 只ApoE
-/-
小鼠随机分为4组,假手术(Sham)组、尿毒症加速动脉粥样硬化(uremia accelerated atherosclerosis,UAAS)组、UAAS+Vector组、UAAS+Sp1组,每组20只。通过主动脉油红O染色(OilRedO,ORO)检测主动脉脂质情况。
结果
2
IS浓度依赖性地促进细胞内DiI-ox-LDL荧光强度(
P
<
0.001)。与IS组相比,IS+Sp1组细胞内DiI-ox-LDL荧光强度明显降低(
P
<
0.001)。IS+Sp1+sh-ABCA1组细胞内DiI-ox-LDL荧光强度明显高于IS+Sp1组(
P
=0.015)。与Sham组相比,UAAS组、UAAS+Vector组主动脉和主动脉根、弓中ORO阳性面积明显增加(
P
<
0.001),和主动脉窦组织中α-平滑肌肌动蛋白(α-smooth muscle actin,α-SMA)与Sp1的共定位水平明显减少(
P
=0.002、0.005)。UAAS+Sp1组主动脉、主动脉根和弓中ORO阳性面积较UAAS+Vector组明显减少(
P
<
0.001),和α-SMA与Sp1的共定位水平较UAAS+Vector组明显增加(
P
=0.008)。UAAS+Sp1组主动脉组织中Sp1和ABCA1蛋白表达水平明显高于UAAS+Vector组(
P
<
0.001)。
结论
2
尿毒症毒素IS可能通过抑制Sp1/ABCA1信号通路诱导VSMCs的脂质积聚,从而加速尿毒症内皮功能受损,促进动脉粥样硬化发展。
Objective
2
To investigate the role of specificity protein 1(Sp1)/ATP-binding cassette transporter A1(ABCA1) signaling pathway in uremic atherosclerosis and its regulatory mechanism.
Methods
2
Mouse vascular smooth muscle cells(VSMCs) were divided into control(Con) group,indophenol sulfate(IS) group,IS+Sp1 group,and IS+Sp1+sh-ABCA1 group. The Con group was treated with 0.1% DMSO for 24 h,while other groups were treated with 250 nmol/L IS for 24 h. The protein expression of Sp1/ABCA1 and lipid accumulation were analyzed by Western blot and Dil-labeled oxidized low-density lipoprotein(Dil-ox-LDL) staining. Eighty ApoE
-/-
mice were randomly divided into four groups: sham group,uremia accelerated atherosclerosis(UAAS) group,UAAS+Vector group,and UAAS+Sp1 group,with 20 mice in each group. Aortic lipids were measured by oil red O(ORO) staining.
Results
2
IS promoted the fluorescence intensity of intracellular DiI-ox-LDL in a concentration-dependent manner(
P
<
0.05). Compared with the IS group,the IS+Sp1 group had a significantly decreased fluorescence intensity of DiI-ox-LDL(
P
<
0.01). The fluorescence intensity of DiI-ox-LDL in the IS+Sp1+sh-ABCA1 group was significantly higher than that in the IS+Sp1 group(
P
<
0.05). Compared with the Sham group,the UAAS and UAAS+Vector groups had significantly increased ORO-positive areas in the aorta and aortic root and arch(
P
<
0.05) and significantly reduced colocation levels of alpha-smooth muscle actin (α-SMA) and Sp1 in the aortic sinus tissue(
P
<
0.05). Compared with the UAAS+Vector group,the UAAS+Sp1 group had significantly reduced ORO-positive areas in the aorta and aortic root and arch(
P
<
0.05) and significantly increased colocation levels of α-SMA and Sp1(
P
<
0.05). The protein expression levels of Sp1 and ABCA1 in the aortic tissue of the UAAS+Sp1 group were significantly higher than those of the UAAS+Vector group(
P
<
0.05).
Conclusion
2
Uremic toxin IS may induce lipid accumulation in the VSMCs by inhibiting the Sp1/ABCA1 signaling pathway,thus accelerating endothelial dysfunction in uremia and promoting the progression of atherosclerosis.
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