A photostable Si-rhodamine-based near-infrared fluorescent probe for monitoring lysosomal pH during heat stroke.

A photostable Si-rhodamine-based near-infrared fluorescent probe for monitoring lysosomal pH during heat stroke.
Anal Chim Acta. 2019 Dec 27;1092:117-125
Authors: Mao GJ, Liang ZZ, Gao GQ, Wang YY, Guo XY, Su L, Zhang H, Ma QJ, Zhang G
Abstract
Heat stroke is a symptom of hyperthermia with a temperature of more than 40 °C, which usually leads to all kinds of physical discomfort and even death. It is necessary to study the mechanism of action of heat stroke on cells or organelles (such as cytotoxicity of heat) and the processes of cells or organelles during heat stroke. Recent studies have shown that there is a certain correlation between heat stroke and lysosome acidity. In order to clarify their relationship, Lyso-NIR-pH, a photostable Si-rhodamine-based near-infrared fluorescent probe, was developed for sensing pH changes in lysosomes during heat stroke in this paper. For Lyso-NIR-pH, a morpholine group is employed as the lysosome-targeting unit and a H+-triggered openable deoxylactam is employed as the response unit to pH. Lyso-NIR-pH can detect pH with a high selectivity and a sensitivity, and its pKa is 4.63. Lyso-NIR-pH also has outstanding imaging performances, such as excellent lysosome-targeting ability, low autofluorescence and photostable fluorescence signal, which are in favor of long-term imaging of pH with accurate fluorescence signals. Moreover, we successfully applied Lyso-NIR-pH to monitor lysosomal pH increases i...

Source: Analytica Chimica Acta - November 13, 2019 Category: Chemistry Authors: Mao GJ, Liang ZZ, Gao GQ, Wang YY, Guo XY, Su L, Zhang H, Ma QJ, Zhang G Tags: Anal Chim Acta Source Type: research