Samenvatting
Soluble tumor necrosis factor-related apoptosis-inducing ligand (sTRAIL) induces apoptosis via the extrinsic death receptor pathway and maybe a biomarker in the pathogenesis of a broad range of diseases. To investigate the role of sTRAIL in asthma, we developed a quantitative LC-MS/MS method with a lower limit of quantitation (LLOQ) of approximate to 3 pM in induced sputum (174 pg/mL) and saliva (198 pg/mL) without the use of antibodies. sTRAIL was enriched by immobilized metal affinity chromatography (IMAC) solid phase extraction (SPE) followed by tryptic digestion and subsequent enrichment of a signature peptide by strong cation exchange (SCX) SPE. The method was validated with respect to stability, accuracy and precision using the standard addition approach and fully metabolically N-15-labelled hrTRAIL as internal standard. Our results indicate that it is possible to quantify cytokines like sTRAIL at the pM level by LC-MS/MS without the use of antibodies, which has, to our knowledge, never been shown before. (C) 2016 Elsevier B.V. All rights reserved.
Originele taal-2 | English |
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Pagina's (van-tot) | 205-210 |
Aantal pagina's | 6 |
Tijdschrift | Journal of Chromatography B-Analytical Technologies in the Biomedical and Life Sciences |
Volume | 1032 |
DOI's | |
Status | Published - 1-okt.-2016 |