title: The Temporal Pattern of Changes in Serum Biomarker Levels Reveals Complex and Dynamically Changing Pathologies after Exposure to a Single Low-Intensity Blast in Mice.
abstract: Time-dependent changes in blood-based protein biomarkers can help identify the -pathological processes in blast-induced traumatic brain injury (bTBI), assess injury severity, and monitor disease progression. We obtained blood from control and injured mice (exposed to a single, low-intensity blast) at 2-h, 1-day, 1-week, and 1-month post-injury. We then determined the serum levels of biomarkers related to metabolism (4-HNE, HIF-1α, ceruloplasmin), vascular function (AQP1, AQP4, VEGF, vWF, Flk-1), inflammation (OPN, CINC1, fibrinogen, MIP-1a, OX-44, p38, MMP-8, MCP-1 CCR5, CRP, galectin-1), cell adhesion and the extracellular matrix (integrin α6, TIMP1, TIMP4, Ncad, connexin-43), and axonal (NF-H, Tau), neuronal (NSE, CK-BB) and glial damage (GFAP, S100β, MBP) at various post-injury time points. Our findings indicate that the exposure to a single, low-intensity blast results in metabolic and vascular changes, altered cell adhesion, and axonal and neuronal injury in the mouse model of bTBI. Interestingly, serum levels of several inflammatory and astroglial markers were either unchanged or elevated only during the acute and subacute phases of injury. Conversely, serum levels of the majority of biomarkers related to metabolic and vascular functions, cell adhesion, as well as neuronal and axonal damage remained elevated at the termination of the experiment (1 month), indicating long-term systemic and cerebral alterations due to blast. Our findings show that the exposure to a single, low-intensity blast induces complex pathological processes with distinct temporal profiles. Hence, monitoring serum biomarker levels at various post-injury time points may provide enhanced diagnostics in blast-related neurological and multi-system deficits.
authors.affiliation: Department of Anatomy, Physiology and Genetics, Uniformed Services University , Bethesda, MD , USA.
authors.forename: Farid
authors.initials: F
authors.lastname: Ahmed
authors.affiliation: Department of Neuroscience, Karolinska Institutet , Stockholm , Sweden.
authors.forename: Stefan
authors.initials: S
authors.lastname: Plantman
authors.affiliation: Faculty of Rehabilitation Medicine, Canadian Military and Veterans' Clinical Rehabilitation Research, University of Alberta , Edmonton, AB , Canada.
authors.forename: Ibolja
authors.initials: I
authors.lastname: Cernak
authors.affiliation: Department of Anatomy, Physiology and Genetics, Uniformed Services University , Bethesda, MD , USA ; Department of Neuroscience, Karolinska Institutet , Stockholm , Sweden.
authors.forename: Denes V
authors.initials: DV
authors.lastname: Agoston
keywords: biomarkers; blast; mouse; serum; traumatic brain injury