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Updated: Feb 15, 2026
08:45
A Western Blotting Protocol for Small Numbers of Hematopoietic Stem Cells
Published on: August 22, 2018
11.0K
Subcellular western blotting of single cells
Kevin A Yamauchi1,2, Amy E Herr1,2
1Department of Bioengineering, University of California, Berkeley, CA 94720, USA.
Microsystems & Nanoengineering
|January 16, 2018
Summary
This study introduces a subcellular western blotting technique for precise protein localization within individual cells. This method overcomes limitations of traditional immunoassays, offering enhanced selectivity and single-cell resolution for studying protein signaling dynamics.
Area of Science:
- Cell biology
- Biochemistry
- Analytical chemistry
Background:
- Immunoassays are standard for subcellular protein localization but suffer from antibody cross-reactivity and fixation artifacts.
- Existing methods lack single-cell resolution or are confounded by technical limitations.
Purpose of the Study:
- To develop a highly selective, single-cell resolution technique for assaying proteins in distinct subcellular compartments (cytoplasm and nucleus).
- To overcome limitations of immunoassays by eliminating antibody cross-reactivity and fixation artifacts.
Main Methods:
- A passive multilayer microdevice enabling precision fluidic control for subcellular fractionation.
- Single-cell differential detergent fractionation to isolate cytoplasmic and nuclear lysates.
- Bi-directional electrophoresis for multiplexed, compartment-specific protein analysis.
- Chemical cytometry assay for direct measurement of nucleocytoplasmic protein distribution.
Main Results:
- Demonstrated subcellular western blotting for six targets per cell with high selectivity.
- Successfully localized spliceosome-associated proteins, distinguishing closely sized proteins.
- Measured NF-κB translocation dynamics in unfixed cells with reduced technical variance compared to immunofluorescence.
- Provided direct measurement of nucleocytoplasmic protein distribution in individual, unfixed cells.
Conclusions:
- The subcellular western blot technique offers enhanced selectivity and single-cell resolution for protein localization.
- This chemical cytometry approach provides valuable insights into protein signaling in heterogeneous cell populations.
- The method reduces technical variance and eliminates reliance on subjective image analysis.
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