Nicorandil protects podocytes via modulation of antioxidative capacity in acute puromycin aminonucleoside-induced nephrosis in rats.

IF 3.7 2区 医学 Q1 PHYSIOLOGY
Masaki Yamanaka, Yoshifuru Tamura, Emiko Kuribayashi-Okuma, Shunya Uchida, Shigeru Shibata
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引用次数: 1

Abstract

Nephrotic syndrome, characterized by proteinuria and hypoalbuminemia, results from the dysregulation of glomerular podocytes and is a significant cause of end-stage kidney disease. Patients with idiopathic nephrotic syndrome are generally treated with immunosuppressive agents; however, these agents produce various adverse effects. Previously, we reported the renoprotective effects of a stimulator of the mitochondrial ATP-dependent K+ channel (MitKATP), nicorandil, in a remnant kidney model. Nonetheless, the cellular targets of these effects remain unknown. Here, we examined the effect of nicorandil on puromycin aminonucleoside-induced nephrosis (PAN) rats, a well-established model of podocyte injury and human nephrotic syndrome. PAN was induced using a single intraperitoneal injection. Nicorandil was administered orally at 30 mg/kg/day. We found that proteinuria and hypoalbuminemia in PAN rats were significantly ameliorated following nicorandil treatment. Immunostaining and ultrastructural analysis under electron microscopy demonstrated that podocyte injury in PAN rats showed a significant partial attenuation following nicorandil treatment. Nicorandil ameliorated the increase in the oxidative stress markers nitrotyrosine and 8-hydroxy-2-deoxyguanosine in glomeruli. Conversely, nicorandil prevented the decrease in levels of the antioxidant enzyme manganese superoxide dismutase in PAN rats. We found that mitochondrial Ca2+ uniporter levels in glomeruli were higher in PAN rats than in control rats, and this increase was significantly attenuated by nicorandil. We conclude that stimulation of MitKATP by nicorandil reduces proteinuria by attenuating podocyte injury in PAN nephrosis, which restores mitochondrial antioxidative capacity, possibly through mitochondrial Ca2+ uniporter modulation. These data indicate that MitKATP may represent a novel target for podocyte injury and nephrotic syndrome.NEW & NOTEWORTHY Our findings suggest that the mitochondrial Ca2+ uniporter may be an upstream regulator of manganese superoxide dismutase and indicate a biochemical basis for the interaction between the ATP-sensitive K+ channel and Ca2+ signaling. We believe that our study makes a significant contribution to the literature because our results indicate that the ATP-sensitive K+ channel may be a potential therapeutic target for podocyte injury and nephrotic syndrome.

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尼可地尔通过调节急性嘌呤霉素氨基核苷肾病大鼠的抗氧化能力来保护足细胞。
肾病综合征以蛋白尿和低白蛋白血症为特征,是肾小球足细胞失调的结果,是终末期肾脏疾病的重要原因。特发性肾病综合征患者通常使用免疫抑制剂治疗;然而,这些药物会产生各种不良反应。之前,我们报道了尼可地尔在残肾模型中对线粒体atp依赖性K+通道(MitKATP)的刺激作用的肾保护作用。尽管如此,这些作用的细胞靶点仍然未知。在这里,我们研究了尼可地尔对嘌呤霉素氨基核苷性肾病(PAN)大鼠的影响,这是一种成熟的足细胞损伤和人肾病综合征模型。单次腹腔注射诱导PAN。口服尼可地尔30 mg/kg/天。我们发现尼可地尔治疗后PAN大鼠的蛋白尿和低白蛋白血症明显改善。电镜下的免疫染色和超微结构分析显示,尼可地尔处理后PAN大鼠足细胞损伤出现明显的部分衰减。尼可地尔改善肾小球氧化应激标志物硝基酪氨酸和8-羟基-2-脱氧鸟苷的升高。相反,尼可地尔阻止PAN大鼠抗氧化酶锰超氧化物歧化酶水平的下降。我们发现,PAN大鼠肾小球中线粒体Ca2+单转运蛋白水平高于对照大鼠,尼可地尔显著降低了这种升高。我们得出结论,尼可地尔刺激MitKATP通过减轻PAN肾病足细胞损伤来减少蛋白尿,从而恢复线粒体抗氧化能力,可能是通过线粒体Ca2+单转运体调节。这些数据表明,MitKATP可能是足细胞损伤和肾病综合征的新靶点。我们的研究结果表明,线粒体Ca2+单转运蛋白可能是锰超氧化物歧化酶的上游调节剂,并表明atp敏感的K+通道和Ca2+信号传导之间相互作用的生化基础。我们认为我们的研究对文献有重大贡献,因为我们的研究结果表明,atp敏感的K+通道可能是足细胞损伤和肾病综合征的潜在治疗靶点。
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来源期刊
CiteScore
8.40
自引率
7.10%
发文量
154
审稿时长
2-4 weeks
期刊介绍: The American Journal of Physiology - Renal Physiology publishes original manuscripts on timely topics in both basic science and clinical research. Published articles address a broad range of subjects relating to the kidney and urinary tract, and may involve human or animal models, individual cell types, and isolated membrane systems. Also covered are the pathophysiological basis of renal disease processes, regulation of body fluids, and clinical research that provides mechanistic insights. Studies of renal function may be conducted using a wide range of approaches, such as biochemistry, immunology, genetics, mathematical modeling, molecular biology, as well as physiological and clinical methodologies.
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