A porphyrin-pyranine dyad for ratiometric fluorescent sensing of intracellular pH
作者:Jinghui Zhang、Mengliang Zhu、Jiawen Cui、Chiming Wang、Ziwen Zhou、Tianhang Wang、Lei Gong、Chaorui Su、Dongdong Qi、Yongzhong Bian、Hongwu Du、Jianzhuang Jiang
DOI:10.1016/j.jphotochem.2020.112524
日期:2020.6
buffer. The two pKa values (pKa1 = 3.92 and pKa2 = 6.46) obtained can be assigned to the successive and reversible protonation/deprotonation of the meso-pyridyl groups and inner pyrrole units of the porphyrin moiety, respectively. Por-Py 1 also exhibits good cell permeability, lysosome-targeting ability, and low cytotoxicity, ensuring its further application for pHi calibration by fluorescence ratio imaging
对于细胞生物学和医学,非常需要通过荧光成像来检测细胞内pH(pH i)。在这项研究中,我们开发了一种基于FRET的卟啉-吡喃二聚体(Por-Py 1),由吡喃基部分作为能量供体和卟啉部分作为pH响应能量受体,用于pH i的比例荧光传感。在PBS缓冲液中pH从2.59变为8.58时,Por-Py 1显示出95倍的荧光强度比(F 660 / F 435)增强。这两个p K a值(p K a1 = 3.92和p K a2 = 6.46)可以分别分配给卟啉部分的中吡啶基和内吡咯单元的连续和可逆的质子化/去质子化。Por-Py 1还表现出良好的细胞渗透性,溶酶体靶向能力和低细胞毒性,从而确保了其在活细胞中通过荧光比率成像在pH i校准中的进一步应用。