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Updated: Mar 17, 2026
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A Streamlined Approach for Mass Spectrometry-Based Proteomics Using Selected Tissue Regions
Published on: April 18, 2025
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An Optimized Method for Protein Extraction from OCT-Embedded Human Kidney Tissue for Protein Quantification by
Marc Vrana1, Anne Goodling1, Maryam Afkarian1
1Department of Pharmaceutics (M.V., B.P.) and Kidney Research Institute and Division of Nephrology, Department of Medicine (A.G., M.A.), University of Washington, Seattle, Washington.
Summary
We developed a cost-effective method to extract proteins from optimal cutting temperature (OCT) medium-embedded kidney tissue. This technique enables reliable quantitative proteomics analysis of clinically relevant proteins in biobanked tissue samples.
Area of Science:
- Biochemistry
- Proteomics
- Renal Medicine
Background:
- Biobanks of remnant kidney biopsy tissue offer potential for quantitative proteomics.
- Optimal cutting temperature (OCT) medium preservation hinders protein quantification by mass spectrometry.
Purpose of the Study:
- To develop a simple, reproducible, and cost-effective protein extraction method for OCT-embedded kidney tissue.
- To enable quantitative proteomics analysis of clinically relevant proteins in archived kidney biopsy samples.
Main Methods:
- Scraping excess OCT medium, homogenization, and diethyl ether/methanol extraction to remove OCT.
- Denaturation, reduction, alkylation, and chloroform/methanol/water extraction for protein recovery.
- Trypsin digestion and targeted selective reaction monitoring (SRM) proteomics for quantification.
Main Results:
- The developed method successfully extracted proteins from OCT-embedded kidney tissue.
- Quantitative proteomics analysis yielded results comparable to flash-frozen tissue.
- Individual protein quantities and interindividual variabilities were similar between OCT-embedded and flash-frozen samples.
Conclusions:
- The described protein extraction procedure is effective for OCT-preserved kidney tissue.
- This method allows for quantitative proteomics studies on archived clinical kidney biopsy samples.
- Enables analysis of clinically relevant proteins, including drug transporters and metabolizing enzymes, in various kidney compartments.
