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High-Throughput Label-free Single-Cell Proteomics Enabled by Multicolumn NanoLC with a 5-min Cycle Time.

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A new multicolumn nanoLC-MS platform enables high-throughput single-cell proteomics (SCP) by reducing run times to 5 minutes. This breakthrough allows for the analysis of thousands of cells per study, offering deep proteome coverage and biological insights.

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Area of Science:

  • Proteomics
  • Mass Spectrometry
  • Cellular Biology

Background:

  • Mass spectrometry (MS)-based single-cell proteomics (SCP) provides high-resolution proteome analysis.
  • Current nanoLC-MS workflows have low throughput due to long separation gradients.
  • This limits the application of SCP in large-scale studies.

Purpose of the Study:

  • To develop a high-throughput multicolumn nanoLC-MS platform for SCP.
  • To enable the analysis of thousands of single cells within a single study.
  • To maintain deep proteome coverage and biological interpretability.

Main Methods:

  • Implementation of a multicolumn nanoLC-MS system with 5-minute separation windows.
  • Operation at ~100 nL/min flow rate with 100% duty cycles.
  • Analysis of over 4,000 samples, including RAW264.7 macrophages.

Main Results:

  • Achieved throughput of ~288 single cells per day (SPD).
  • Identified ~3,200 proteins per single HeLa cell, comparable to longer-gradient methods.
  • Demonstrated accurate quantification across ~6,000 proteins and distinguished cellular proteomes.
  • Revealed LPS-induced markers and macrophage activation pathways.

Conclusions:

  • The developed platform is robust, scalable, and suitable for high-throughput SCP.
  • Enables thousands of single-cell analyses in a single study.
  • Maintains deep proteome coverage and biological interpretability for cellular heterogeneity studies.