A highly sensitive fluorescent probe for HClO and its application in live cell imaging

Area of Science:

• Chemical Biology
• Analytical Chemistry
• Biomedical Imaging

Background:

• Hypochlorous acid (HClO) is a reactive oxygen species involved in various physiological and pathological processes.
• Accurate detection and imaging of HClO are crucial for understanding its biological roles.
• Existing detection methods often lack specificity or sensitivity for in vivo applications.

Purpose of the Study:

• To design and synthesize a new rhodamine-based fluorescent molecular probe for sensitive and selective detection of HClO.
• To evaluate the probe's performance in buffer solutions and its applicability for imaging endogenous HClO in living cells.

Main Methods:

• Synthesis of a novel rhodamine-based fluorescent probe (Probe 1).
• Spectroscopic analysis (fluorescence intensity) to assess probe response to HClO.
• Selectivity studies against other reactive oxygen and/or nitrogen species.
• Cellular imaging experiments to visualize endogenous HClO in living cells under physiological conditions.

Main Results:

• Probe 1 exhibited near-zero fluorescence in its free state.
• A significant enhancement in fluorescence intensity was observed upon reaction with HClO.
• The probe demonstrated excellent sensitivity and selectivity for HClO over other species.
• Successful imaging of endogenous HClO in living cells was achieved using Probe 1.

Conclusions:

• The developed rhodamine-based probe is a highly sensitive and selective tool for HClO detection.
• Probe 1 offers a promising platform for investigating the biological functions of HClO in vitro and in vivo.
• This fluorescent probe facilitates the real-time imaging of endogenous HClO in living systems.