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Characterizing RNA Modifications in Single Neurons Using Mass Spectrometry
Published on: April 21, 2022
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Subcellular Peptide Localization in Single Identified Neurons by Capillary Microsampling Mass Spectrometry
Linwen Zhang1, Nikkita Khattar1, Ildiko Kemenes2
1Department of Chemistry, The George Washington University, Washington, DC, 20052, USA.
Scientific Reports
|August 17, 2018
Summary
Single cell mass spectrometry identified neuropeptides in distinct subcellular locations within single neurons. This technique revealed peptide localization differences between cytoplasm and nucleus, advancing our understanding of cellular peptide functions.
Area of Science:
- Cellular Biology
- Neuroscience
- Analytical Chemistry
Background:
- Single cell analysis is crucial for understanding cellular heterogeneity.
- Peptides play diverse roles in cellular compartments, including neurotransmission and gene regulation.
- Subcellular peptide localization requires advanced analytical techniques.
Purpose of the Study:
- To analyze subcellular peptide distributions within identified single neurons.
- To sequence novel neuropeptides using mass spectrometry.
- To investigate the localization of Phe-Met-Arg-Phe amide-like (FMRFamide-like) neuropeptides in neuronal cytoplasm and nucleus.
Main Methods:
- Capillary microsampling mass spectrometry (MS) coupled with ion mobility separation.
- Analysis of single neurons from the mollusk Lymnaea stagnalis.
- Tandem MS for de novo peptide sequencing.
Main Results:
- Quantification of nine neuropeptides in the cytoplasm of FMRFamide-like peptide-expressing neurons.
- Detection of six of these neuropeptides within the neuronal nucleus at varying abundances.
- Sequencing of a novel 28-residue neuropeptide from enriched neuronal samples.
Conclusions:
- Single cell mass spectrometry enables detailed analysis of subcellular peptide localization.
- Distinct neuropeptide profiles exist between neuronal cytoplasm and nucleus.
- This approach facilitates the discovery and characterization of novel neuropeptides within single cells.
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