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位点特异性N-糖蛋白质组学分析揭示弱精子症患者精浆中岩藻糖基化上调。

Site-specific N-glycoproteomic analysis reveals up-regulated fucosylation in seminal plasma of asthenozoospermia.

作者信息

Xin Miaomiao, Li Cheng, You Shanshan, Zhu Bojing, Shen Jiechen, Dong Wenbo, Xue Xia, Shi Wenhao, Xiong Yao, Shi Juanzi, Sun Shisheng

机构信息

The Assisted Reproduction Center, Northwest Women and Children's Hospital, NO. 73, houzaimen, Xincheng Zone, Xi'an 710003, China.

Laboratory for Disease Glycoproteomics, College of Life Sciences, Northwest University, Xi'an 710069, P. R. China.

出版信息

Glycobiology. 2024 Jul 26;34(9). doi: 10.1093/glycob/cwae054.

Abstract

N-linked glycoproteins are rich in seminal plasma, playing essential roles in supporting sperm function and fertilization process. The alteration of seminal plasma glycans and its correspond glycoproteins may lead to sperm dysfunction and even infertility. In present study, an integrative analysis of glycoproteomic and proteomic was performed to investigate the changes of site-specific glycans and glycoptoteins in seminal plasma of asthenozoospermia. By large scale profiling and quantifying 5,018 intact N-glycopeptides in seminal plasma, we identified 92 intact N-glycopeptides from 34 glycoproteins changed in asthenozoospermia. Especially, fucosylated glycans containing lewis x, lewis y and core fucosylation were significantly up-regulated in asthenozoospermia compared to healthy donors. The up-regulation of fucosylated glycans in seminal plasma may interfere sperm surface compositions and regulation of immune response, which subsequently disrupts sperm function. Three differentiated expression of seminal vesicle-specific glycoproteins (fibronectin, seminogelin-2, and glycodelin) were also detected with fucosylation alteration in seminal plasma of asthenozoospermia. The interpretation of the altered site-specific glycan structures provides data for the diagnosis and etiology analysis of male infertility, as well as providing new insights into the potential therapeutic targets for male infertility.

摘要

N-连接糖蛋白在精浆中含量丰富,在支持精子功能和受精过程中发挥着重要作用。精浆聚糖及其相应糖蛋白的改变可能导致精子功能障碍甚至不育。在本研究中,进行了糖蛋白质组学和蛋白质组学的综合分析,以研究弱精子症患者精浆中位点特异性聚糖和糖蛋白的变化。通过对精浆中5018种完整N-糖肽进行大规模分析和定量,我们从34种在弱精子症中发生变化的糖蛋白中鉴定出92种完整N-糖肽。特别是,与健康供体相比,弱精子症患者中含有岩藻糖x、岩藻糖y和核心岩藻糖基化的岩藻糖化聚糖显著上调。精浆中岩藻糖化聚糖的上调可能会干扰精子表面成分和免疫反应调节,进而破坏精子功能。在弱精子症患者的精浆中还检测到三种精囊特异性糖蛋白(纤连蛋白、精子蛋白2和糖蛋白D)的差异表达,且伴有岩藻糖基化改变。对位点特异性聚糖结构改变的解读为男性不育的诊断和病因分析提供了数据,也为男性不育的潜在治疗靶点提供了新的见解。

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