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Related Concept Videos

Proteomics01:33

Proteomics

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A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term...
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The homogenate obtained after cell lysis contains various membrane-bound organelles that can be further separated into pure fractions by subcellular fractionation. These isolates are used to study specific cellular components, analyze localized protein activity, and are even employed in diagnostics. Fractionation is typically achieved using centrifugation methods, the most common being density-gradient and differential centrifugation.
Differential Centrifugation
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One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry out specialized functions. Since biological membranes are only selectively permeable to solutes, they help create a compartment with controlled conditions inside an organelle. These microenvironments are tailored to the organelle's specific functions and help isolate them from the surrounding cytosol.
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NicheProt: Cell-type-resolved proteomics of tissue compartments.

Yi-Chien Wu1, Dylan Schwartz1, Elie Abi Khalil1

  • 1Department of Pharmaceutical Sciences, University of Illinois College of Pharmacy, Chicago, IL, USA.

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|November 24, 2025
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Summary

Spatial proteomics reveals distinct dendritic cell phenotypes in mouse spleen niches. This new method enables cell-type and microregion-resolved proteomic analysis for discovering cell subtypes and functions.

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Area of Science:

  • Proteomics
  • Cell Biology
  • Immunology

Background:

  • Spatial proteomics provides insights into cellular functions within tissues.
  • Laser capture microdissection and mass spectrometry offer proteomic profiling but lack cell-type specificity.
  • Analyzing specific cell types within defined tissue microenvironments remains challenging.

Purpose of the Study:

  • To develop a novel method for cell-type and microregion-resolved spatial proteomics.
  • To identify distinct dendritic cell phenotypes within specific niches of the inflamed mouse spleen.

Main Methods:

  • Developed NicheProt, a 3D optical microscopy-guided, photobleaching-mediated cell barcoding technique.
  • Applied sequential bottom-up proteomic analysis to isolated cell populations.
  • Utilized NicheProt to analyze CD11c+ dendritic cells in the mouse spleen.

Main Results:

  • Identified two distinct CD11c+ dendritic cell phenotypes based on spatial location in the inflamed mouse spleen.
  • Characterized these compartment-specific populations by proteomic signatures with 54 protein level differences.
  • Demonstrated the capability of NicheProt for high-resolution spatial proteomic analysis.

Conclusions:

  • NicheProt enables precise isolation of specific cell types from defined tissue niches.
  • This method facilitates the discovery of previously unrecognized cell subtypes and their functions.
  • Spatial proteomics guided by 3D microscopy is powerful for understanding tissue complexity.