Enhanced mitochondrial fluorescence imaging through confinement fluorescence effect within a rigid silicon suboxide...

Area of Science:

• Cell Biology
• Nanotechnology
• Biochemistry

Background:

• Fluorescence imaging is crucial for studying mitochondrial morphology in live cells.
• Current fluorophores face challenges with photostability and phototoxicity for long-term monitoring.
• Developing advanced imaging probes is essential for understanding mitochondrial dynamics.

Purpose of the Study:

• To introduce the confinement fluorescence effect (CFE) for designing novel fluorophores.
• To create nanoparticles encapsulating fluorophores to enhance fluorescence and reduce phototoxicity.
• To enable long-term, non-invasive monitoring of mitochondrial morphology and dynamics.

Main Methods:

• Confining small-molecule fluorophores within silicon suboxide nanoparticles (CFE-NPs).
• Functionalizing CFE-NPs with TPP+ for mitochondrial targeting (SY2@SiOxTPP).
• Evaluating fluorescence intensity, phototoxicity, and mitochondrial function assays.

Main Results:

• CFE-NPs (SY2@SiOx) showed an 80-fold increase in fluorescence intensity and 0.15-fold reduction in phototoxicity.
• SY2@SiOxTPP demonstrated effective mitochondrial imaging and dynamics monitoring.
• SY2@SiOxTPP exhibited significantly lower phototoxicity to mitochondrial functions than conventional probes.

Conclusions:

• CFE-NPs offer a promising strategy for developing superior fluorescence imaging probes.
• SY2@SiOxTPP enables long-term, functional live-cell imaging of mitochondrial dynamics.
• This approach overcomes limitations of current probes for studying cellular processes.