Here we demonstrate a technique to generate proteomic signatures of specific cell types within heterogeneous populations. While our method is broadly applicable across biological systems, we have limited the current work to study neural cell types isolated from human, post-mortem Alzheimer’s disease (AD) and aged-matched non-symptomatic (NS) brains. Motivating the need for this tool, we conducted an initial meta-analysis of current, human AD proteomics studies. While the results broadly corroborated major neurodegenerative disease hypotheses, cell type-specific predictions were limited. By adapting our Formaldehyde-fixed Intracellular Target-Sorted Antigen Retrieval (FITSAR) method for proteomics and applying this technique to characterize AD and NS brains, we generated enriched neuron and astrocyte proteomic profiles for a sample set of donors (available at www.fitsarpro.appspot.com). Results showed the feasibility for using FITSAR to evaluate cell-type specific hypotheses. Our overall methodological approach provides an accessible platform to determine protein presence in specific cell types and emphasizes the need for protein-compatible techniques to resolve systems complicated by cellular heterogeneity.
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Fluorescence-activated cell sorting
Formaldehyde-fixed Intracellular Target-Sorted Antigen Retrieval
Glial fibrillary acidic protein
Hallmark gene sets
KEGG gene sets
Oligodendrocyte marker 1
Phosphate saline buffer
Protease and phosphatase inhibitor
Reactome gene sets
Sodium dodecyl sulfate
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The authors would like to thank Rebecca Hamelin and Brown’s Animal Care Facility for providing sentinel rats for method optimization, Dr. Edward Stopa, Terra D. Velilla, and the Brain Tissue Resource Center for providing primary human brain samples, Mark Dooner and the COBRE Flow Cytometry Core at Rhode Island Hospital for his assistance with FACS runs, Dr. TuKiet Lam, Jean Kanyo, Wei Wei Wang, and Keck Mass Spectrometry & Proteomics Resource Core at Yale University for the mass spectrometry sample preparation and data analysis, Dr. Thomas Neubert for his feedback on the proteomics analyses, Dr. Thomas Wisniewski, Dr. Arline Faustin, and the New York University Alzheimer’s Disease Center (funded in part by PHS Grant P30 AG08051) for providing primary human brain tissue sections, and Dr. Ryosuke Kita for his help on using data spectra.
This work was supported by the National Institutes of Health (R01 AR063642 to EMD, T32 to JSS via T32 AG052909 (Wisniewski, Scharfman)), the National Science Foundation (CAREER CBET 1253189 and EAGER CBET 1547819 to EMD, GRFP 2014183678 to JSS), the Cure Alzheimer’s Fund (SAL), and the Alzheimer’s Disease Resource Center at NYU Langone (SAL and JSS).
JSS, LAC, HCC, CF, SAL, and EMD designed the study and wrote the manuscript. JSS conducted all experimental work, including cell isolation, FACS, WBs, and proteomics experiments. JSS and LAC conducted all bioinformatics analyses. JSS and HCC conducted all confocal imaging.
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Sadick, J.S., Crawford, L.A., Cramer, H.C. et al. Generating Cell Type-Specific Protein Signatures from Non-symptomatic and Diseased Tissues. Ann Biomed Eng 48, 2218–2232 (2020). https://doi.org/10.1007/s10439-020-02507-y
- Alzheimer’s disease
- Cellular heterogeneity