Genetically-encoded markers for confocal visualization of single dense core vesicles.

Area of Science:

• Neuroscience
• Cell Biology
• Molecular Biology

Background:

• Neuronal dense core vesicles (DCVs) are crucial for storing and releasing various neuromodulators, trophic factors, and bioamines.
• Analyzing single DCVs is challenging with traditional electron microscopy, hindering the understanding of cargo segregation and vesicle heterogeneity.

Purpose of the Study:

• To overcome the limitations of electron microscopy for single DCV analysis.
• To develop novel tools for visualizing and analyzing DCV heterogeneity and cargo segregation at single-vesicle resolution.

Main Methods:

• Development of genetically-encoded markers specifically designed for DCVs.
• Integration of these markers with standard immunohistochemistry techniques.
• Application of expansion microscopy to achieve super-resolution imaging.
• Utilizing confocal microscopy for single-vesicle analysis.

Main Results:

• Successful development and validation of genetically-encoded markers for DCVs.
• Demonstration of single-vesicle resolution for DCV analysis using confocal microscopy.
• Enabled detailed investigation of DCV cargo segregation and heterogeneity.

Conclusions:

• The new genetically-encoded markers provide a powerful approach to study neuronal DCVs.
• This method overcomes previous limitations, allowing for unprecedented insights into DCV function and composition.
• Facilitates advanced research in neurobiology and molecular medicine.