Clinically Viable Assay for Monitoring Uromodulin Glycosylation.

Clinically Viable Assay for Monitoring Uromodulin Glycosylation.
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DOI:
10.1021/jasms.0c00317
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发表时间:
2021-02-03
影响因子:
3.2
通讯作者:
Desaire H
Desaire H
中科院分区:
化学3区
文献类型:
--
作者:
Patabandige MW;Go EP;Desaire H

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尿调蛋白,也称为Tamm-Horsfall蛋白或THP,是人类尿液中排泄的最丰富的蛋白质。它与肾脏疾病的进展有关;因此,这种蛋白质的糖基化谱的变化可以作为肾脏健康的潜在生物标志物。用于定量尿调蛋白糖基化的典型糖组学分析方法涉及耗时且繁琐的糖蛋白分离和标记步骤,这限制了其在临床糖组学测定中的效用,其中样品通量是重要的。在这里,我们介绍了一个从根本上简化的样品制备工作流程,直接ESI-MS分析,使定量的N-连接的聚糖来源于尿调蛋白。该方法省略了任何聚糖标记步骤,但包括减少样品的盐含量的步骤,从而使离子抑制最小化。该方法可有效地定量来自不同生物状态的尿调蛋白样品的细微糖基化差异。作为概念证明,来自不同妊娠状态的样品的糖基化显示是可区分的。
Uromodulin, also known as the Tamm-Horsfall protein or THP, is the most abundant protein excreted in human urine. It is associated with the progression of kidney diseases; therefore, changes in the glycosylation profile of this protein could serve as a potential biomarker for kidney health. The typical glycomics analysis approaches used to quantify uromodulin glycosylation involve time-consuming and tedious glycoprotein isolation and labeling steps, which limit their utility in clinical glycomics assays, where sample throughput is important. Herein we introduce a radically simplified sample preparation workflow, with direct ESI-MS analysis, enabling the quantitation of N-linked glycans that originate from uromodulin. The method omits any glycan labeling steps but includes steps to reduce the salt content of the samples, thereby minimizing ion suppression. The method is effective for quantifying subtle glycosylation differences of uromodulin samples derived from different biological states. As a proof of concept, glycosylation from samples that differ by pregnancy status were shown to be differentiable.
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