Dual-Stimuli-Responsive Probes for Detection of Ovarian Cancer Cells and Quantification of Both pH and Enzyme Activity
作者:Wenting Huo、Koji Miki、Daisuke Tokunaga、Huiying Mu、Masahiro Oe、Hiroshi Harada、Kouichi Ohe
DOI:10.1246/bcsj.20210168
日期:2021.8.15
Many physiological processes involve multiple coordinated chemical and/or biological events. Therefore, it is considered urgent to develop dual-responsive probes for a more comprehensive understanding of the synergistic effects between multiple analytes in complex cellular environments. In this study, we developed a dual-responsive probe βgal-BP-PMB (β-galactosyl–3,3′-dihydroxy-2,2′-bipyridyl–p-methoxybenzyl), the photoluminescence of which can be activated by β-galactosidase (β-gal) and acidic conditions. The overexpression of β-gal is an important feature of senescent and ovarian cancer cells. Single-input activatable probes for detecting β-gal activity in ovarian cancer cells can induce a false positive response from senescent cells. Because the lysosomal pH in senescent cells is increased, probe βgal-BP-PMB can be specifically activated in ovarian cancer cells, but silenced in senescent cells. Probe βgal-BP-PMB has a small molecular size, high sensitivity towards targeted stimuli and unique ratiometric properties, thereby enabling the quantification of both pH and enzyme activity. Such dual-responsive probes could earn a unique place in the field of bioimaging, where multiple analytes should be accurately and simultaneously monitored.
许多生理过程涉及多种协调的化学和/或生物事件。因此,开发双响应探针以更全面地了解复杂细胞环境中多种分析物之间的协同效应被认为是当务之急。在这项研究中,我们开发了一种双响应探针βgal-BP-PMB(β-半乳糖基-3,3′-二羟基-2,2′-联吡啶-对甲氧基苄基),其光致发光可被β-半乳糖苷酶(β-gal)和酸性条件激活。β-gal的过度表达是衰老细胞和卵巢癌细胞的一个重要特征。用于检测卵巢癌细胞中β-gal活性的单输入可激活探针可能会诱发衰老细胞的假阳性反应。由于衰老细胞的溶酶体 pH 值升高,探针 βgal-BP-PMB 可在卵巢癌细胞中被特异性激活,但在衰老细胞中却被沉默。探针βgal-BP-PMB分子小,对靶向刺激的灵敏度高,具有独特的比率测量特性,因此可以同时对pH值和酶活性进行定量。这种双响应探针可在生物成像领域赢得一席之地,因为该领域需要同时准确地监测多种分析物。