Noninvasive imaging of sialyltransferase activity in living cells by chemoselective recognition.

Noninvasive imaging of sialyltransferase activity in living cells by chemoselective recognition.
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通过化学选择性识别对活细胞中唾液酸转移酶活性进行无创成像

DOI:
10.1038/srep10947
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发表时间:
2015-06-05
期刊:
影响因子:
4.6
通讯作者:
Ju H
Ju H
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bao L;Ding L;Yang M;Ju H

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为了阐明唾液酸转移酶(STS)的生物学和病理功能,细胞内的ST活性评估是必要的。针对目前缺乏非侵入性获取动态活动信息的方法,本文设计了一种用于细胞内ST活动的FRET原位成像和唾液酸化过程示踪的传感平台。该系统以四甲基罗丹明-异硫氰酸酯标记的唾液酸(TRITC-AF)为ST底物,以荧光素-异硫氰酸酯标记的3-氨基苯基硼酸(FITC-APBA)为唾液酸化产物的化学选择性识别探针,两者均被包裹在脂质体中用于细胞递送。FITC-APBA对唾液酸化的TRITC-AF的识别导致FRET信号,并通过FRET效率图像进行分析。这一策略已被用于评估ST活性与恶性程度和细胞表面唾液酸化的相关性,以及抑制唾液酸化的活性。这项工作为研究多糖生物合成机制、癌症诊断和药物开发提供了强有力的非侵入性工具。
To elucidate the biological and pathological functions of sialyltransferases (STs), intracellular ST activity evaluation is necessary. Focusing on the lack of noninvasive methods for obtaining the dynamic activity information, this work designs a sensing platform for in situ FRET imaging of intracellular ST activity and tracing of sialylation process. The system uses tetramethylrhodamine isothiocyanate labeled asialofetuin (TRITC-AF) as a ST substrate and fluorescein isothiocyanate labeled 3-aminophenylboronic acid (FITC-APBA) as the chemoselective recognition probe of sialylation product, both of which are encapsulated in a liposome vesicle for cellular delivery. The recognition of FITC-APBA to sialylated TRITC-AF leads to the FRET signal that is analyzed by FRET efficiency images. This strategy has been used to evaluate the correlation of ST activity with malignancy and cell surface sialylation, and the sialylation inhibition activity of inhibitors. This work provides a powerful noninvasive tool for glycan biosynthesis mechanism research, cancer diagnostics and drug development.
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