Volume 6, Issue 1 p. 153-171
Research Article

Proteomic analysis of malignant lymphocyte membrane microparticles using double ionization coverage optimization

Laurent Miguet

Laurent Miguet

Laboratoire de Spectrométrie de Masse Bio-Organique, UMR 7512, Strasbourg, France

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Karine Pacaud

Karine Pacaud

Laboratoire de Spectrométrie de Masse Bio-Organique, UMR 7512, Strasbourg, France

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Claire Felden

Claire Felden

Institut d'Hématologie et d'Immunologie, Faculté de Médecine, Université Louis Pasteur, Strasbourg Cedex, France

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Bénédicte Hugel

Bénédicte Hugel

Institut d'Hématologie et d'Immunologie, Faculté de Médecine, Université Louis Pasteur, Strasbourg Cedex, France

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M. Carmen Martinez

M. Carmen Martinez

Institut d'Hématologie et d'Immunologie, Faculté de Médecine, Université Louis Pasteur, Strasbourg Cedex, France

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Jean-Marie Freyssinet

Jean-Marie Freyssinet

Institut d'Hématologie et d'Immunologie, Faculté de Médecine, Université Louis Pasteur, Strasbourg Cedex, France

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Raoul Herbrecht

Raoul Herbrecht

Département d'Onco-Hématologie, Hôpital Hautepierre, Strasbourg, France

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Noelle Potier Dr.

Corresponding Author

Noelle Potier Dr.

Laboratoire de Spectrométrie de Masse Bio-Organique, UMR 7512, Strasbourg, France

Laboratoire de Spectrométrie de Masse Bio-Organique, ECPM, Université Louis Pasteur, CNRS UMR 7512, 25 rue Becquerel 67087 Strasbourg Cedex 2 France Fax: +33-390-242781===Search for more papers by this author
Alain van Dorsselaer

Alain van Dorsselaer

Laboratoire de Spectrométrie de Masse Bio-Organique, UMR 7512, Strasbourg, France

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Laurent Mauvieux Dr.

Laurent Mauvieux Dr.

Institut d'Hématologie et d'Immunologie, Faculté de Médecine, Université Louis Pasteur, Strasbourg Cedex, France

Laboratoire d'Hématologie, Hôpital Hautepierre, Strasbourg, France

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First published: 09 January 2006
Citations: 104

Abstract

Shed membrane microparticles (MPs) are microvesicles generated from the plasma membrane when cells are submitted to stress conditions. Although MPs reflect the cell state (at least in vitro), little is known on their protein composition. We describe the first set of experiments aiming to characterize the MP proteome. Two ways of triggering MP formation from a T-lymphocytic cell line were analyzed using a 1-D gel approach coupled with LC-MS/MS and the results were compared with those obtained from a classic membrane preparation. In total, 390 proteins were identified in MPs, among which 34% were localized to the plasma membrane. The MPs revealed a broad representation of plasma membrane proteins including 17 hematopoietic clusters of differentiation. This approach was successfully applied to one human chronic B-cell lymphoid malignancy. In all, 413 proteins were identified, including 117 membrane proteins, many of them being pathology associated. The sequence coverage in identified proteins was improved combining both nano-LC-MS/MS and MALDI-MS data. The suppression effect, observed on very complex peptide mixtures, was remediated by chromatographic fractionation. MPs may represent a new tool for studying plasma membrane proteins, displaying the advantages of reproducibility, minimal organelle contamination, and being potentially applicable to most cell types.