Fluorescent probes that stain living nerve terminals

Area of Science:

• Neuroscience
• Cell Biology
• Biochemistry

Background:

• Cationic mitochondrial dyes are used to visualize cellular structures.
• Staining living nerve terminals is crucial for understanding neural function.
• Previous methods had limitations in long-term observation of nerve terminal dynamics.

Purpose of the Study:

• To evaluate the efficacy of 18 cationic mitochondrial dyes for staining living nerve terminals.
• To identify dyes that provide excellent staining of neuromuscular junctions.
• To assess the long-term impact of the most effective dye on nerve terminal structure and function.

Main Methods:

• Screening of 18 cationic mitochondrial dyes for their ability to stain nerve terminals.
• Detailed investigation of the optimal dye, 4-(4-diethylaminostyryl)-N-methylpyridinium iodide (4-Di-2-ASP).
• Assessment of the dye's effect on the structure and function of motor nerve terminals.

Main Results:

• Several cationic mitochondrial dyes demonstrated efficacy in staining living nerve terminals.
• Excellent staining of neuromuscular junctions was achieved across multiple species.
• The dye 4-Di-2-ASP showed no adverse long-term effects on motor nerve terminal structure or function.

Conclusions:

• 4-Di-2-ASP is a highly effective dye for staining nerve terminals.
• This dye allows for the long-term tracking of identified motor nerve terminal configurations.
• It offers a valuable tool for neuroscience research, particularly in studying neural plasticity and development.