SCI REP:通过荧光探针的水解实时成像肠道细菌β-葡糖醛酸糖苷酶活性

2017-06-10 Yara MedSci原创

基于FDGlcU的成像显示了肠道细菌βG的体外和体内活性,这将有助于动物研究中特异性细菌βG抑制剂的药效学研究。

肠道细菌β-葡萄糖醛酸糖苷酶(βG)在葡萄糖醛酸化的代谢物水解时产生毒性物质,导致肠道损伤。因此,开发抑制βG的方法是重要的,但是受到直接评估活体动物酶活性的困难限制。在这里,研究人员使用荧光探针荧光素二-β-D-葡糖苷酸(FDGlcU)来非侵入地成像裸鼠中的肠细菌βG活性。体外细胞检测显示检出下限限为表达βG的104个菌落形成单位,而7.81ng / mL的FDGlcU足以产生显着的荧光信号。在裸鼠全身光学图像中,用FDGlcU灌胃后3小时时检测到肠中βG活性的最大荧光信号。用细菌βG抑制剂预处理后,腹部和肠切除图像中的荧光信号显着降低。用抑制肠道细菌的抗生素治疗4天,基于FDGlcU的图像显示βG活性在第4天降低8.5倍,然后在治疗停止后逐渐增加。结果表明,基于FDGlcU的成像显示了肠道细菌βG的体外和体内活性,这将有助于动物研究中特异性细菌βG抑制剂的药效学研究。

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