Single molecular multianalyte (Ca2+, Mg2+) fluorescent probe and applications to bioimaging

Area of Science:

• Cell Biology
• Biochemistry
• Molecular Imaging

Background:

• Intracellular signal transduction relies on precise spatial and temporal dynamics of signaling molecules.
• Multicolor imaging is crucial for studying these dynamics but faces challenges like spectral overlap and probe toxicity.
• Understanding the interplay between calcium (Ca2+) and magnesium (Mg2+) is vital, as Ca2+ is a key transmitter and Mg2+ acts as a cofactor.

Purpose of the Study:

• To overcome the limitations of existing multicolor imaging techniques for analyzing intracellular signaling.
• To develop a novel method for simultaneous quantification and imaging of intracellular Ca2+ and Mg2+ concentrations.
• To demonstrate the utility of single-molecular multifluorescent probes for complex biological analyses.

Main Methods:

• Design and synthesis of a novel Ca2+-Mg2+ responsive multifluorescent probe, KCM-1.
• KCM-1 exhibits distinct spectral shifts (blue for Ca2+, red for Mg2+) upon cation binding.
• Simultaneous quantification of Ca2+ and Mg2+ using KCM-1 with analysis at different excitation wavelengths and intracellular imaging via the AM-ester method.

Main Results:

• KCM-1 successfully demonstrated cation-specific spectral responses.
• Simultaneous quantification of intracellular Ca2+ and Mg2+ concentrations was achieved.
• Intracellular Ca2+ and Mg2+ were successfully imaged simultaneously using the developed probe and method.

Conclusions:

• Single-molecular multifluorescent probes offer a superior alternative to traditional multicolor imaging for analyzing intracellular analyte dynamics.
• The KCM-1 probe enables unprecedented simultaneous imaging of intracellular Ca2+ and Mg2+.
• This represents the first successful demonstration of intracellular multiple analyte imaging using a single-molecular multifluorescent probe.