A near-infrared fluorescent sensor for selective detection of cysteine and its application in live cell imaging

作者：Guan, Ying-Shi; Niu, Li-Ya; Chen, Yu-Zhe; Wu, Li-Zhu; Tung, Chen-Ho; Yang, Qing-Zheng^*

来源：RSC Advances, 2014, 4(16): 8360-8364.

DOI：10.1039/c3ra47116k

• LIVING CELLS
• IN-VIVO
• PLASMA HOMOCYSTEINE
• ALZHEIMERS-DISEASE
• REACTIVE OXYGEN
• RISK-FACTOR
• PROBE
• GLUTATHIONE
• THIOLS
• NAPHTHALIMIDE

Biological thiols, including cysteine (Cys), homocysteine (Hcy) and glutathione (GSH), play important roles in maintaining the appropriate redox status of biological systems. The discrimination between them is of great importance because of their different biological roles. Herein, we present a new near-infrared (NIR) fluorescent sensor Cy-NO2 for selective detection of Cys over Hcy/GSH. The nitrothiophenol group is introduced to quench the fluorescence through photo-induced electron transfer (PET). The sensor undergoes displacement of nitrothiophenol with thiol to turn on the fluorescence. The amino groups of Cys/Hcy further replace the thiolate to form amino-substituted products, which exhibit dramatically different photophysical properties compared to the sulfur-substituted product from the reaction with GSH. By means of more rapid intramolecular displacement of sulfur with the amino group of Cys than Hcy, the discrimination of Cys is achieved. Moreover, Cy-NO2 was successfully applied for bioimaging Cys in living cells.

• 出版日期2014
• 单位中国科学院大学; 中国科学院理化技术研究所