Plasma PCSK9 measurement by liquid chromatography-Tandem mass spectrometry and comparison with conventional ELISA - Archive ouverte HAL
Article Dans Une Revue Journal of Chromatography B - Analytical Technologies in the Biomedical and Life Sciences Année : 2017

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

Khadija Ouguerram
Stéphanie Billon-Crossouard
  • Fonction : Auteur

Résumé

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.
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Dates et versions

hal-01607568 , version 1 (03-10-2017)

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Mickael Croyal, Fanta Fall, Michel Krempf, Aurélie Thedrez, Khadija Ouguerram, et al.. Plasma PCSK9 measurement by liquid chromatography-Tandem mass spectrometry and comparison with conventional ELISA. Journal of Chromatography B - Analytical Technologies in the Biomedical and Life Sciences, 2017, 1044, pp.24-29. ⟨10.1016/j.jchromb.2016.12.040⟩. ⟨hal-01607568⟩
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