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Plasma PCSK9 measurement by liquid chromatography-Tandem mass spectrometry and comparison with conventional ELISA

By Mickael CROYAL, Fanta Fall, Michel Krempf, Aurélie Thedrez, Khadija Ouguerram, Veronique Ferchaud-Roucher, Audrey Aguesse, Stéphanie Billon-Crossouard, Pedro Mata, Rodrigo Alonso, Gilles Lambert and Estelle Nobecourt

Abstract

The combination of liquid chromatography-tandem mass spectrometry (LC-MS/MS) and trypsin proteolysis is an effective tool for accurate quantitation of multiple proteins in a single run. However, expensive samples pre-treatment as immunoenrichment are often required to analyze low abundant proteins. Plasma proprotein convertase subtilisin/kexin type 9 (PCSK9), a circulating regulator of low-density lipoprotein metabolism, was studied as an example of a low abundant plasma protein. We investigated post-proteolysis solid-phase extraction (SPE) as an alternative strategy to improve its detection. After optimization of pretreatment, including denaturation, reduction, alkylation, tryptic digestion and selective SPE concentration, 91 +/- 7% of PCSK9 was recovered from human plasma samples and coefficients of variation were less than 13.2% with a lower limit of quantification of 37.5 ng/ml. This LC-MS/MS method was compared with standard enzyme-linked immunosorbent assay in 30 human plasma samples with a broad range of PCSK9 concentrations. Both methods were significantly correlated (r =0.936, p < 0.001) with less than 7% of the values out of the 95% confidence interval and similar concentrations were measured using either LC-MS/MS or ELISA methods (514.2 +/- 217.2 vs. 504.2 +/- 231.0 ng/ml, respectively p = NS). This method involving SPE is an effective measurement tool for low abundant plasma protein analysis that could be easily included in multiplexed assays

Topics: Proteotypic peptide analysis, LC-MS/MS, Solid-phase extraction, PCSK9, [SDV]Life Sciences [q-bio]
Publisher: 'Elsevier BV'
Year: 2017
DOI identifier: 10.1016/j.jchromb.2016.12.040
OAI identifier: oai:HAL:hal-01607568v1
Provided by: HAL-Univ-Nantes
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