Abstract
Leucocytes from soldiers exposed to battlefield-like stress (RASP: Rangers Assessment and Selection Program) were exposed in vitro to Staphylococcal enterotoxin B (SEB). We assayed SEB-induced regulation of gene expression, both in the presence and absence of severe stress, to generate two sets of gene profiles. One set of transcripts and microRNAs were specific to post-RASP SEB exposure, and another set were signatures of SEB exposure common to both the pre- and post-RASP leucocytes. Pathways and upstream regulatory analyses indicated that the post-RASP SEB-signature transcripts were manifestation of the anergic state of post-RASP leucocytes. These were further verified using expression-based predictions of cellular processes and literature searches. Specificity of the second set of transcripts to SEB exposure was verified using machine-learning algorithms on our and four other (Gene Expression Omnibus) data sets. Cell adhesion, coagulation, hypoxia and vascular endothelial growth factor-mediated vascular leakage were SEB-specific pathways even under the background of severe stress. Hsa-miR-155-3p was the top SEB exposure predictor in our data set, and C-X-C motif chemokine ligand 9 was SEB specific in all the analyzed data sets. The SEB-signature transcripts (which also showed distinct expression signatures from Yersinia pestis and dengue virus) may serve as potential biomarkers of SEB exposure even under the background of stress.
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Acknowledgements
We thank Julia Scheerer and Allison Hoke for editing the manuscript and for their invaluable comments. We are grateful to The Defense Threat Reduction Agency for funding.
Human subjects protection
Research was conducted in compliance with IRB-approved human subjects protocol—no.1014 for initial collection of samples and A-16815 for continuation of data evaluation. The human use approval was obtained from the local Protection of Human subjects Office and further approved by the Human Research Protection Office, Office of Research Protections, US Army Medical Research and Materiel Command, Fort Detrick, MD, USA.
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The views, opinions, and/or findings contained in this report are those of the authors and should not be construed as official Department of the Army position, policy or decision, unless so designated by other official documentation. Citations of commercial organizations or trade names in this report do not constitute an official Department of the Army endorsement or approval of the products or services of these organizations.
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Muhie, S., Hammamieh, R., Cummings, C. et al. Stress-caused anergy of leukocytes towards Staphylococcal enterotoxin B and exposure transcriptome signatures. Genes Immun 16, 330–346 (2015). https://doi.org/10.1038/gene.2015.16
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DOI: https://doi.org/10.1038/gene.2015.16