Quantitation of peptides from non-invasive skin tapings using isotope dilution and tandem mass spectrometry.

Quantitation of peptides from non-invasive skin tapings using isotope dilution and tandem mass spectrometry.

J Chromatogr B Analyt Technol Biomed Life Sci. 2018 Mar 21;1084:132-140

Authors: Reisdorph N, Armstrong M, Powell R, Quinn K, Legg K, Leung D, Reisdorph R

Abstract
Previous work from our laboratories utilized a novel skin taping method and mass spectrometry-based proteomics to discover clinical biomarkers of skin conditions; these included atopic dermatitis, Staphylococcus aureus colonization, and eczema herpeticum. While suitable for discovery purposes, semi-quantitative proteomics is generally time-consuming and expensive. Furthermore, depending on the method used, discovery-based proteomics can result in high variation and inadequate sensitivity to detect low abundant peptides. Therefore, we strove to develop a rapid, sensitive, and reproducible method to quantitate disease-related proteins from skin tapings. We utilized isotopically-labeled peptides and tandem mass spectrometry to obtain absolute quantitation values on 14 peptides from 7 proteins; these proteins had shown previous importance in skin disease. The method demonstrated good reproducibility, dynamic range, and linearity (R2 > 0.993) when n = 3 standards were analyzed across 0.05-2.5 pmol. The method was used to determine if differences exist between skin proteins in a small group of atopic versus non-atopic individuals (n = 12). While only minimal differences were found, peptides were detected in all samples and exhibited good correlation between peptides for 5 of the 7 proteins (R2 = 0.71-0.98). This method can be applied to larger cohorts to further establish the relationships of these proteins to skin disease.

PMID: 29601982 [PubMed - as supplied by publisher]

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