Prospective Assessment of Acute Blood Markers of Brain Injury in Sport-Related Concussion

• Published in: Journal of neurotrauma Vol. 34; no. 22; pp. 3134 - 3142
• Main Authors: Meier, Timothy B, Nelson, Lindsay D, Huber, Daniel L, Bazarian, Jeffrey J, Hayes, Ronald L, McCrea, Michael A
• Format: Journal Article
• Language: English
• Published: United States Mary Ann Liebert, Inc 15.11.2017
• Subjects: Acute Disease; Acute effects; Adolescent; Adult; Athletes; Athletic Injuries - blood; Biomarkers; Biomarkers - blood; Blood; Blood-brain barrier; Brain Concussion - blood; Brain injury; Calcium-binding protein; College football; Concussion; Emergency medical care; Follow-Up Studies; Football - injuries; Glial fibrillary acidic protein; Glial Fibrillary Acidic Protein - blood; Humans; Hydrolase; Male; Neurosciences; Neurosurgery; Original; Prospective Studies; Protein gene product 9.5; Proteins; S100 Calcium Binding Protein beta Subunit - blood; S100b protein; Serum levels; Sports injuries; Src protein; Trauma; Traumatic brain injury; Ubiquitin; Ubiquitin Thiolesterase - blood; Young Adult; S100B; UCH-L1; mild traumatic brain injury; GFAP
• ISSN: 0897-7151; 1557-9042
• DOI: 10.1089/neu.2017.5046

There is a pressing need to identify objective biomarkers for the assessment of sport-related concussion (SRC) to reduce the reliance on clinical judgment for the management of these injuries. The goal of the current study was to prospectively establish the acute effects of SRC on serum levels of S100 calcium-binding protein beta (S100B), glial fibrillary acidic protein (GFAP), and ubiquitin C-terminal hydrolase-L1 (UCH-L1). Collegiate and high school football players were enrolled and provided blood at pre-season. Injured athletes participated in follow-up visits at ∼6 and 24-48 h following documented SRC (n = 32). Uninjured football players participated in similar follow-up visits and served as controls (n = 29). The median time between injury and blood collection was 2 h (6 h visit) and 22.5 h (24-48 h visit) in concussed athletes. Concussed athletes had significantly elevated UCH-L1 levels at the 6 h visit relative to pre-season levels (Z = 2.22, p = 0.03) and levels in control athletes (Z = 3.02, p = 0.003). Concussed athletes also had elevated S100B at 6 h relative to pre-season (Z = 2.07, p = 0.04) and controls (Z = 2.75, p = 0.006). Both markers showed fair discrimination between concussed and control athletes (UCH-L1 area under receiver operating characteristic curve [AUC] [95% CI] = 0.74 [0.61-0.88], S100B AUC = 0.72 [0.58-0.87]). Percent-change of UCH-L1 and S100B at 6 h relative to pre-season also showed fair discrimination (AUC = 0.79 [0.66-0.92] and AUC = 0.77 [0.64-0.90]). GFAP levels did not differ between groups or in concussed athletes relative to pre-season. This study provides prospective evidence of significant increases in serum levels of UCH-L1 and S100B during the early acute period following SRC, and lays the foundation for future studies examining the clinical potential for blood-based biomarkers in the early detection of concussion.