AUTHOR=Neumann Kiel D. , Seshadri Vikram , Thompson Xavier D. , Broshek Donna K. , Druzgal Jason , Massey James C. , Newman Benjamin , Reyes Jose , Simpson Spenser R. , McCauley Katelyenn S. , Patrie James , Stone James R. , Kundu Bijoy K. , Resch Jacob E. 

TITLE=Microglial activation persists beyond clinical recovery following sport concussion in collegiate athletes

JOURNAL=Frontiers in Neurology

VOLUME=14

YEAR=2023

URL=https://www.frontiersin.org/journals/neurology/articles/10.3389/fneur.2023.1127708

DOI=10.3389/fneur.2023.1127708

ISSN=1664-2295

ABSTRACT=<sec><title>Introduction</title><p>In concussion, clinical and physiological recovery are increasingly recognized as diverging definitions. This study investigated whether central microglial activation persisted in participants with concussion after receiving an unrestricted return-to-play (uRTP) designation using [<sup>18</sup>F]DPA-714 PET, an <italic>in vivo</italic> marker of microglia activation.</p></sec><sec><title>Methods</title><p>Eight (5 M, 3 F) current athletes with concussion (Group 1) and 10 (5 M, 5 F) healthy collegiate students (Group 2) were enrolled. Group 1 completed a pre-injury (Visit1) screen, follow-up Visit2 within 24 h of a concussion diagnosis, and Visit3 at the time of uRTP. Healthy participants only completed assessments at Visit2 and Visit3. At Visit2, all participants completed a multidimensional battery of tests followed by a blood draw to determine genotype and study inclusion. At Visit3, participants completed a clinical battery of tests, brain MRI, and brain PET; no imaging tests were performed outside of Visit3.</p></sec><sec><title>Results</title><p>For Group 1, significant differences were observed between Visits 1 and 2 (<italic>p</italic> &lt; 0.05) in ImPACT, SCAT5 and SOT performance, but not between Visit1 and Visit3 for standard clinical measures (all <italic>p</italic> &gt; 0.05), reflecting clinical recovery. Despite achieving clinical recovery, PET imaging at Visit3 revealed consistently higher [<sup>18</sup>F]DPA-714 tracer distribution volume (VT) of Group 1 compared to Group 2 in 10 brain regions (<italic>p</italic> &lt; 0.001) analyzed from 164 regions of the whole brain, most notably within the limbic system, dorsal striatum, and medial temporal lobe. No notable differences were observed between clinical measures and VT between Group 1 and Group 2 at Visit3.</p></sec><sec><title>Discussion</title><p>Our study is the first to demonstrate persisting microglial activation in active collegiate athletes who were diagnosed with a sport concussion and cleared for uRTP based on a clinical recovery.</p></sec>