J Invest Dermatol:银屑病皮肤上的钠积聚可以反映病情严重程度

2021-10-25 医路坦克 MedSci原创

钠是人体必需的矿物质和渗透压调节剂。它是细胞外液中的主要阳离子,因此在维持血液容量、渗透压和血压的调节等稳态过程中起着至关重要的作用。

钠是人体必需的矿物质和渗透压调节剂。它是细胞外液中的主要阳离子,因此在维持血液容量、渗透压和血压的调节等稳态过程中起着至关重要的作用。动物研究表明,膳食中的盐负荷可通过与糖胺聚糖结合导致皮肤中储存高渗钠。钠是由单核-巨噬细胞系统衍生的血管内皮生长因子诱导的淋巴管生成介导从皮肤的清除。阻断淋巴管内皮细胞VEGF-C受体的VEGF受体3可诱导盐敏感型高血压,这表明皮肤钠稳态与血压调节直接相关。钠-23 (23Na)磁共振成像(MRI)的最新发展使人类皮肤和软组织中钠的无创定量和可视化成为可能。23Na MRI研究表明,高血压患者的皮肤钠含量更高,从而证实了动物研究的发现。此外,发现皮肤钠含量随着年龄的增长而增加,并且在肾功能降低的患者中也是如此。因此,当血钠的浓度超过正常血清水平时,会在皮肤上积聚。高钠环境可导致致病性辅助性T细胞-17(IL-17)的增殖。银屑病是一种慢性炎症性皮肤病,产生IL-17的T辅助细胞在其中起关键作用。

结果:在一项观察性研究中,我们用钠-23磁共振成像技术测量了与银屑病患者年龄匹配的健康对照组的皮肤钠含量。PASI>5的患者皮肤钠和水含量明显高于PASI较低的患者或健康对照组,而其他组织中的钠和水含量无明显变化。用钠-23光谱学或原子吸收光谱法在灰白色的皮肤活检组织中测量皮肤钠浓度,用钠-23磁共振成像证实了这一发现。银屑病患者外周血辅助性T细胞-17细胞在氯化钠浓度升高的条件下,可明显诱导IL-17A的表达。咪喹莫特诱导的牛皮癣小鼠模型证实了人类的发现。细胞外示踪剂铬-51-EDTA在咪喹莫特组和对照治疗组皮肤中的测量显示细胞外浓度相似,导致细胞内水分过多。慢性遗传性IL-17A导致的牛皮癣小鼠模型强调了IL-17A在皮肤钠蓄积和炎症中的作用。

图1 用23Na MRI测定正常人和银屑病患者皮肤和肌肉的钠、水含量:(a)正常人皮肤和PASI评分在5分以下和以上的患者皮肤的相对钠强度;(b)皮肤相对钠强度与PASI评分的相关性。(c)对照组和研究组皮肤中的相对水信号强度。(d)健康对照组和PASI评分低于或高于5分的患者肌肉中的相对钠强度。(e)肌肉中的相对钠强度与PASI评分之间的相关性。(f)对照组和患者组肌肉中的相对水信号强度。(g)具有代表性的23Na磁共振成像(TE=2.07ms),显示健康对照组和银屑病患者低PASI和高PASI评分的小腿(上图)。同一受试者的代表性水(1H-MRI)图像(下图)。含有10、20、30和40 mmol/l氯化钠溶液的试管布置在末端下方,从而允许我们校准组织中的钠。*P<0.001.1H-MRI,质子磁共振成像;23Na,钠-23;MRI,磁共振成像;ms,毫秒;Na,钠离子;NaCl,氯化钠;ns,无意义,TE,回声时间

图2.银屑病患者皮肤钠含量与炎症参数和循环IL-17+γδT细胞相关,皮肤相对钠强度与血液(A)白细胞总数、(B)中性粒细胞和(C)hsCRP浓度呈显著正相关。(D)银屑病患者循环刺激CD3+CD4-γδTCR+细胞IL-17A和IFN-γ表达的代表性点图分析。银屑病患者IL-17+IFNγ-γδTCR+细胞与皮肤相对钠强度呈显著正相关。23Na,钠-23;G,GigA;hsCRP,高敏CRP;MRI,磁共振成像;Na,钠离子;Q,四分位;TE,回声时间。

结论:我们的数据将皮肤钠描述为银屑病的病理生理特征,这可能为银屑病的治疗开辟新的途径。

原文出处:

Maifeld A,  Wild J,  Karlsen TV, et al.Skin Sodium Accumulates in Psoriasis and Reflects Disease Severity.J Invest Dermatol 2021 Jul 05

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    2021-10-26 查查佳佳

    心电图不好记、看不懂,怎么办?记住这

    0

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    2021-10-25 1207866fm50(暂无昵称)

    谢谢分享

    0

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    2021-10-25 谭桂峰

    钠是人体必需的矿物质和渗透压调节剂。

    0

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    2021-10-25 ms6000000292023383

    学习

    0

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