Abstract
Lipidomics investigates the composition and function of lipids, typically employing blood or tissue samples as the primary study matrices. Hair has recently emerged as a potential complementary sample type to identify biomarkers in early disease stages and retrospectively document an individual’s metabolic status due to its long detection window of up to several months prior to the time of sampling. However, the limited coverage of lipid profiling presented in previous studies has hindered its exploitation. This study aimed to evaluate the lipid coverage of hair using an untargeted liquid chromatography-high-resolution mass spectrometry lipidomics platform. Two distinct three-step exhaustive extraction experiments were performed using a hair metabolomics one-phase extraction technique that has been recently optimized, and the two-phase Folch extraction method which is recognized as the gold standard for lipid extraction in biological matrices. The applied lipidomics workflow improved hair lipid coverage, as only 99 species could be annotated using the one-phase extraction method, while 297 lipid species across six categories were annotated with the Folch method. Several lipids in hair were reported for the first time, including N-acyl amino acids, diradylglycerols, and coenzyme Q10. The study suggests that hair lipids are not solely derived from de novo synthesis in hair, but are also incorporated from sebum and blood, making hair a valuable matrix for clinical, forensic, and dermatological research. The improved understanding of the lipid composition and analytical considerations for retrospective analysis offers valuable insights to contextualize untargeted hair lipidomic analysis and facilitate the use of hair in translational studies.
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Data availability
Raw datafiles are available through the MassIVE repository (https://massive.ucsd.edu/ProteoSAFe/) with the data set identifier MSV000091771.
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Acknowledgements
MvdL and EI acknowledge funding of the Research Scientific Foundation-Flanders (FWO)—project numbers 1120623N and 1161620N, respectively. KMdS was funded by the University of Antwerp (BOF DOCPRO 4-Antigoon ID 36893). In addition, RR acknowledges funding of the University of Antwerp (BOF-Antigoon ID 46315). The work was supported by the Exposome Centre of Excellence of the University of Antwerp (BOF grant, Antigoon database number 41222).
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MvdL: conceptualization, methodology, investigation, formal analysis, validation, visualization, writing—original draft, writing—review and editing. KMdS: methodology, investigation, writing—review and editing. EI and RR: methodology, writing—review and editing. ALNvN and AC: supervision, conceptualization, writing—review and editing, resources.
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van de Lavoir, M., da Silva, K.M., Iturrospe, E. et al. Untargeted hair lipidomics: comprehensive evaluation of the hair-specific lipid signature and considerations for retrospective analysis. Anal Bioanal Chem 415, 5589–5604 (2023). https://doi.org/10.1007/s00216-023-04851-z
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DOI: https://doi.org/10.1007/s00216-023-04851-z