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Abstract

Medicine

A Protein Suspension-Trapping Sample Preparation for Tear Proteomics by Liquid Chromatography-Tandem Mass Spectrometry

Published: December 1st, 2023

DOI:

10.3791/64617

1Centre for Myopia Research, School of Optometry, The Hong Kong Polytechnic University, 2Centre for Eye and Vision Research (CEVR), 3Research Centre for SHARP Vision (RCSV), The Hong Kong Polytechnic University, 4Research Centre for Chinese Medicine Innovation (RCMI), The Hong Kong Polytechnic University

* These authors contributed equally

Abstract

Tear fluid is one of the easily accessible biofluids that can be collected non-invasively. Tear proteomics has the potential to discover biomarkers for several ocular diseases and conditions. The suspension trapping column has been reported to be an efficient and user-friendly sample preparation workflow for the broad application of downstream proteomic analysis. Yet, this strategy has not been well-studied in the analysis of human tear proteome. The present protocol describes an integrated workflow from clinical human tear samples to purified peptides for non-invasive tear protein biomarker research using mass spectrometry, which provides insights into disease biomarkers and monitoring when combined with bioinformatics analysis. A protein suspension trapping sample preparation was applied and demonstrated the discovery of tear proteome with fast, reproducible, and user-friendly procedures, as a universal, optimized sample preparation for human tear fluid analysis. In particular, the suspension trapping procedure outperformed in-solution sample preparation in terms of peptide recovery, protein identification, and shorter sample preparation time.

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Keywords Tear Proteomics

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