Abstract
Protein biomarker discovery and validation are crucial for diagnosis, prognosis, and theranostics of human pathologies; “omics” approaches bring new insights in this field. In particular, the combination of immuno-sensors in array format with mass spectrometry efficiently extends the classical immunoassay format and includes molecular characterization. Here, we coupled surface plasmon resonance imaging (SPRi) with MALDI-TOF mass spectrometry in a hyphenated technique which enables multiplexed quantification of binding by SPRi and molecular characterization of interacting partners by subsequent MS analysis. This adds specificity, because MS enables differentiation of molecules that are difficult to distinguish by use of antibodies, for example truncation variants or protein isoforms. Proof of concept was established for detection, identification, and characterization of a potential breast cancer marker, the LAG3 protein, at ~1 μg mL−1, added to human plasma. The analytical performance of this new method, dubbed “SUPRA-MS”, was established, particularly its specificity (S/N > 10) and reliability (100 % LAG3 identification with high significant mascot score >87.9). The adjusted format for rapid, collective, and automated on-chip MALDI-MS analysis is robust at the femtomole level and has numerous potential applications in proteomics.
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Acknowledgment
The authors thank other members of our laboratory for help and fruitful discussions. The authors would like to thank Dr Frédéric Triebel (from Immutep SA) for providing the A9H12/LAG3 model and the technological “Mimento platform” (Besançon, France). We are grateful to Bruker Daltonics, especially Y. Hebert for his technological support. This study was supported by grants from Horiba Scientific, the Ministry of Health and Research, the Conseil Regional de Bourgogne, and the Franche-Comté University. The authors thank Mr Philip Bastable, translator at Dijon Hospital, for proofreading.
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Remy-Martin, F., El Osta, M., Lucchi, G. et al. Surface plasmon resonance imaging in arrays coupled with mass spectrometry (SUPRA–MS): proof of concept of on-chip characterization of a potential breast cancer marker in human plasma. Anal Bioanal Chem 404, 423–432 (2012). https://doi.org/10.1007/s00216-012-6130-4
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DOI: https://doi.org/10.1007/s00216-012-6130-4