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Targeted LC-MS/MS for the evaluation of proteomics biomarkers in the blood of neonates with necrotizing enterocolitis and late-onset sepsis

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Abstract

Late-onset sepsis (LOS) and necrotizing enterocolitis (NEC) are severe life-threatening conditions for neonates. Accurate, early diagnosis and timely initiation of treatment are crucial. Non-specific overlapping clinical signs along with the non-sensitive/specific diagnostic tools set obstacles to speedy, trustful diagnosis including differential diagnosis. The objective of this study was to evaluate the potential of targeted LC-MS/MS proteomics in identifying diagnostic biomarkers of NEC or LOS. We conducted a prospective case-control study evaluating serum proteomics profiles of 25 NEC, 18 LOS, and an equal number of matched control neonates, over three sampling points. Eighty-three concatemers and synthetic peptides belonging to 47 protein markers of the two diseases were selected after thorough literature search. A novel selected reaction monitoring (SRM), LC-MS/MS method was developed for their analysis and evaluation as potential biomarkers. Multivariate and univariate statistical analyses highlighted significant proteins in differentiating LOS and NEC neonates and diseased from controls. Moreover, panels of proteins were tested for their ability to distinguish LOS from NEC and controls. We suggest two panels of three proteins each, exhibiting very high diagnostic value for LOS and excellent diagnostic performance at the critical LOS-NEC differentiation, reaching an AUC ROC value close to 1 (0.999). These panels constitute a valuable starting point for further validation with broader cohorts of neonates, aiming to improve the clinical practice.

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Acknowledgements

This research has been co-financed—via a program of State Scholarships Foundation (IKY)—by the European Union (European Social Fund (ESF)) and Greek national funds through the action entitled “Scholarships programme for postgraduate studies—2nd Study Cycle” in the framework of the Operational Programme “Human Resources Development Program, Education and Lifelong Learning” of the National Strategic Reference Framework (NSRF) 2014–2020.

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Contributions

Anastasia Chrysovalantou Chatziioannou, Kosmas Sarafidis, Georgios Theodoridis, Justina Clarinda Wolters, and Rainer Bischoff conceived and designed the study and contributed to the realization of the analysis. Anastasia Chrysovalantou Chatziioannou, Kosmas Sarafidis, Georgios Theodoridis, Rainer Bischoff, Justina Clarinda Wolters, and Jan Albert Kuivenhoven. contributed to the manuscript’s drafting. Anastasia Chrysovalantou Chatziioannou performed analytical proteomics experiments, statistical analysis, and prepared tables (except ESM Table S1) and figures. Kosmas Sarafidis, Agathi Thomaidou, and Charalampos Agakidis were responsible for the medical care of neonates, clinical data evaluation, and sampling. Justina Clarinda Wolters and Rainer Bischoff. supervised sample analysis and provided the infrastructure required. Justina Clarinda Wolters developed the applied targeted proteomics essays. Jan Albert Kuivenhoven and Natalia Govorukhina provided concatemers and synthetic peptides respectively for the targeted proteomics analysis. All authors reviewed the manuscript.

Corresponding authors

Correspondence to Rainer Bischoff or Georgios Theodoridis.

Ethics declarations

The study protocol was reviewed and approved by the School of Medicine ethics committee of the Aristotle University of Thessaloniki. Informed written consent was obtained from all parents/guardians before enrolling the neonates in the study.

Conflict of interest

All authors declare that they have no conflict of interest.

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Chatziioannou, A.C., Wolters, J.C., Sarafidis, K. et al. Targeted LC-MS/MS for the evaluation of proteomics biomarkers in the blood of neonates with necrotizing enterocolitis and late-onset sepsis. Anal Bioanal Chem 410, 7163–7175 (2018). https://doi.org/10.1007/s00216-018-1320-3

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  • DOI: https://doi.org/10.1007/s00216-018-1320-3

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