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Validation of hepcidin quantification in plasma using LC-HRMS and discovery of a new hepcidin isoform
Bertrand Rochat1, Davide Peduzzi, Justin McMullen
1Quantitative Mass Spectrometry Facility University of Lausanne -CHUV, Route du Bugnon, BH18-218, 1011 Lausanne, Switzerland.
Background:
Hepcidin, a 25 amino acid peptide, plays an important role in iron homeostasis. Some hepcidin truncated peptides have antibiotic effects.
Results:
A new analytical method for hepcidin determination in human plasma using LC-HRMS operating in full-scan acquisition mode has been validated. The extraction consists of protein precipitation and a drying reconstitution step; a 2.1 x 50 mm (idxL) C18 analytical column was used. Detection specificity, stability, accuracy, precision and recoveries were determined. The LOQ/LOD were 0.25/0.1 nM, respectively. More than 600 injections of plasma extracts were performed, allowing evaluation of the assay robustness. Hepcidin-20, hepcidin-22 and a new isoform, hepcidin-24, were detected in patients.
Conclusion:
The data underscore the usefulness of LC-HRMS for in-depth investigations related to hepcidin levels and pathways.
