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Updated: Sep 18, 2025
Proteomic Sample Preparation from Formalin Fixed and Paraffin Embedded Tissue
Published on: September 2, 2013
μMap-FFPE: A High-Resolution Protein Proximity Labeling Platform for Formalin-Fixed Paraffin-Embedded Tissue Samples
Noah B Bissonnette1, Marie E Zamanis2, Steve D Knutson1
1Merck Center for Catalysis at Princeton University, Princeton, New Jersey 08544, United States.
Abstract:
Many disease states can be understood by elucidating small-scale biomolecular protein interaction networks, or microenvironments. Photoproximity labeling methods, like μMap, have recently emerged as high-resolution techniques for mapping spatial relationships within subcellular architectures. However, in vitro models typically utilized lack the cell-type heterogeneity and three-dimensional structure essential for translating findings to clinical settings. To this end, formalin-fixed paraffin-embedded (FFPE) tissues are invaluable model systems for biomedical research, as they preserve complex multicellular interaction networks in their natural environment. While identifying microscale interactions in these samples could provide critical clinical insights, chemical modifications introduced during formalin-fixation and de-cross-linking are incompatible with standard photoproximity labeling techniques. Herein, we introduce μMap-FFPE, a new labeling system that enables comparison of the CD20 interactome across healthy cells, cancerous cells, and preserved patient tissues.
Insights
We developed μMap-FFPE, a novel method to map protein interactions in formalin-fixed paraffin-embedded tissues. This technique allows studying cellular microenvironments in preserved patient samples, advancing disease research.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Understanding disease states requires elucidating small-scale biomolecular protein interaction networks (microenvironments).
- Photoproximity labeling, such as μMap, offers high-resolution mapping of spatial relationships within subcellular architectures.
- Existing in vitro models lack the cell-type heterogeneity and 3D structure crucial for clinical relevance.
Purpose of the Study:
- To develop a photoproximity labeling method compatible with formalin-fixed paraffin-embedded (FFPE) tissues.
- To enable the study of protein interactions within the native cellular environment of FFPE samples.
- To compare the CD20 interactome across healthy, cancerous, and patient-derived tissues.
Main Methods:
- Introduction of μMap-FFPE, a novel labeling system.
- Adaptation of photoproximity labeling techniques for FFPE tissues, overcoming chemical modification incompatibilities.
- Application of μMap-FFPE to analyze the CD20 interactome.
Main Results:
- Successfully adapted photoproximity labeling for FFPE tissues.
- Enabled comparison of the CD20 interactome in diverse cellular contexts.
- Demonstrated the utility of μMap-FFPE for studying protein interactions in preserved patient samples.
Conclusions:
- μMap-FFPE is a valuable tool for mapping protein interactions in FFPE tissues.
- This method facilitates the study of cellular microenvironments in native tissue architectures.
- Findings from μMap-FFPE can provide critical clinical insights into disease states.
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