Single neuron analysis by capillary electrophoresis with fluorescence spectroscopy

Area of Science:

• Neuroscience
• Analytical Chemistry
• Biochemistry

Background:

• Analyzing intracellular compounds in single neurons is challenging due to small sample volumes.
• Existing methods often lack the sensitivity or specificity required for comprehensive neuronal profiling.

Purpose of the Study:

• To develop and validate a sensitive technique for simultaneous identification and quantification of multiple compounds within individual neurons.
• To establish a method applicable to complex biological samples like neurons from marine invertebrates.

Main Methods:

• Nanoliter volume sampling of individual neurons.
• Capillary electrophoresis for compound separation.
• Wavelength-resolved native fluorescence detection for identification.

Main Results:

• Simultaneous analysis of over 30 compounds in single neurons.
• Achieved limits of detection in the attomole to femtomole range.
• Successfully identified aromatic monoamines (e.g., serotonin), amino acids, peptides, flavins, and nucleotide analogs.
• Demonstrated applicability in neurons from Aplysia californica and Pleurobranchaea californica.

Conclusions:

• The developed technique offers high sensitivity and specificity for analyzing complex neuronal chemistry.
• This method provides a powerful tool for neurochemical research and understanding neuronal function.
• The technique is robust and applicable to diverse neuronal types.