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Accueil du site > Production scientifique > Implementation of a Penning Ionization Source on a FTICR Instrument With Ion Funnel Optics

Implementation of a Penning Ionization Source on a FTICR Instrument With Ion Funnel Optics

Date de publication: 1er septembre 2013

Marie-Anne Maubert, Elodie Quévrain, Estelle Capton, Jean Pierre Grill, Ginette Thomas, Marie Bachelet, Dominique Rainteau, Germain Trugnan, Jean-Claude Tabet, Joëlle Masliah, Carlos Afonso
Rapid Communications in Mass Spectrometry 27 2179 (2013). DOI

Travail réalisé sur le site de l’Université Pierre et Marie Curie.

Abstract

RATIONALE

Intestinal epithelial cells (IEC) secrete many chemokines in response to proinflammatory stimuli. We investigated their role in the mucosal inflammatory response in the intestine, by developing a non-targeted approach for analyzing the profile of peptides secreted by stimulated IEC, based on differential mass spectrometry analysis.

METHODS

Lipopolysaccharide (LPS) was incubated with IEC as a proinflammatory stimulus. Differential peptidomic analysis was then carried out, comparing the profiles of IEC with and without LPS stimulation. A mass spectrometry procedure was developed, based on a liquid chromatography/tandem mass spectrometry (LC/MS/MS) approach without enzymatic pretreatment of the peptides. Partial de novo sequencing was carried out by Fourier transform ion cyclotron resonance (FTICR), and the native peptides in the culture media were identified.

RESULTS

A major ion (m/z 7862.51) detected after stimulation was identified as GRO alpha and a minor ion (m/z 8918.17) was identified as IL-8. ELISA-based comparisons gave results consistent with those obtained by MS. Surprisingly, GRO alpha was secreted in amounts 5 to 15 times higher than those for IL-8 in our cellular model. The truncated form of IL-8, resulting from activation, was detected and distinguished from the native peptide by MS, whereas this was not possible with enzyme-linked immunosorbent assay (ELISA).

CONCLUSIONS

Mass spectrometric analysis of culture media can be used to identify the principal peptides produced in response to the stimulation of IEC, and their metabolites. Mass spectrometry provides a comprehensive view of the chemokines and peptides potentially involved in gut inflammation, making it possible to identify the most appropriate peptides for further quantification.