Kidney Int:蛋白尿慢性肾病与红细胞寿命、变形能力和代谢改变有关

2021-12-30 MedSci原创 MedSci原创

尿毒症环境中的红细胞功能障碍是红细胞丢失和肾病相关贫血发生的重要机制。

贫血是慢性肾病常见的并发症,影响患者的生活质量在各种因素中,缺铁、促红细胞生成素缺乏症和红细胞(RBC)寿命缩短与贫血的发病机制有关。然而,关于肾病患者体内红细胞功能障碍的机制数据尚缺乏。本研究描述了服用阿霉素或诱导性波多霉素缺乏导致的蛋白肾病小鼠发生慢性肾病相关贫血的情况。

在这两个实验模型中,尽管循环促红细胞生成素水平和骨髓和脾脏中的红细胞生成增加,但第10天仍出现贫血,并在第30天发生进展。两种小鼠模型的循环红细胞的形态都发生了改变,渗透敏感性变形能力降低,同时外质膜上的磷脂酰丝氨酸外化增加,这是红细胞死亡的标志。阿霉素诱导的肾病小鼠第20天的红细胞荧光标记显示其血液循环过早清除。

蛋白尿慢性肾病(CKD)伴贫血患者红细胞(RBC)死亡

两种小鼠模型的红细胞代谢组学分析显示氧化还原循环途径和Lands循环(一种膜脂重塑过程)的时间变化。蛋白尿肾病的贫血患者循环磷脂酰丝氨酸阳性红细胞的比例增加。

这项研究表明,在小鼠模型中,蛋白尿性肾病导致红细胞(RBC)过早清除,最终导致贫血的发生。慢性肾病和贫血患者的红细胞死亡也增加。无论内源性促红细胞生成素分泌如何,尿毒症环境中的红细胞功能障碍是红细胞丢失和肾病相关贫血发生的重要机制。

参考文献:Rosi Bissinger, Travis Nemkov, Angelo D'Alessandro, et al, Proteinuric chronic kidney disease is associated with altered red blood cell lifespan, deformability and metabolism, Kidney International, Volume 100, Issue 6, 2021, Pages 1227-1239, ISSN 0085-2538, https://doi.org/10.1016/j.kint.2021.08.024.

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    2021-12-22 gwc389

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