PMID- 33613412 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20210604 IS - 1664-2295 (Print) IS - 1664-2295 (Electronic) IS - 1664-2295 (Linking) VI - 11 DP - 2020 TI - Peripheral Blood and Salivary Biomarkers of Blood-Brain Barrier Permeability and Neuronal Damage: Clinical and Applied Concepts. PG - 577312 LID - 10.3389/fneur.2020.577312 [doi] LID - 577312 AB - Within the neurovascular unit (NVU), the blood-brain barrier (BBB) operates as a key cerebrovascular interface, dynamically insulating the brain parenchyma from peripheral blood and compartments. Increased BBB permeability is clinically relevant for at least two reasons: it actively participates to the etiology of central nervous system (CNS) diseases, and it enables the diagnosis of neurological disorders based on the detection of CNS molecules in peripheral body fluids. In pathological conditions, a suite of glial, neuronal, and pericyte biomarkers can exit the brain reaching the peripheral blood and, after a process of filtration, may also appear in saliva or urine according to varying temporal trajectories. Here, we specifically examine the evidence in favor of or against the use of protein biomarkers of NVU damage and BBB permeability in traumatic head injury, including sport (sub)concussive impacts, seizure disorders, and neurodegenerative processes such as Alzheimer's disease. We further extend this analysis by focusing on the correlates of human extreme physiology applied to the NVU and its biomarkers. To this end, we report NVU changes after prolonged exercise, freediving, and gravitational stress, focusing on the presence of peripheral biomarkers in these conditions. The development of a biomarker toolkit will enable minimally invasive routines for the assessment of brain health in a broad spectrum of clinical, emergency, and sport settings. CI - Copyright (c) 2021 Janigro, Bailey, Lehmann, Badaut, O'Flynn, Hirtz and Marchi. FAU - Janigro, Damir AU - Janigro D AD - Department of Physiology Case Western Reserve University, Cleveland, OH, United States. AD - FloTBI Inc., Cleveland, OH, United States. FAU - Bailey, Damian M AU - Bailey DM AD - Neurovascular Research Laboratory, Faculty of Life Sciences and Education, University of South Wales, Wales, United Kingdom. FAU - Lehmann, Sylvain AU - Lehmann S AD - IRMB, INM, UFR Odontology, University Montpellier, INSERM, CHU Montpellier, CNRS, Montpellier, France. FAU - Badaut, Jerome AU - Badaut J AD - Brain Molecular Imaging Lab, CNRS UMR 5287, INCIA, University of Bordeaux, Bordeaux, France. FAU - O'Flynn, Robin AU - O'Flynn R AD - IRMB, INM, UFR Odontology, University Montpellier, INSERM, CHU Montpellier, CNRS, Montpellier, France. FAU - Hirtz, Christophe AU - Hirtz C AD - IRMB, INM, UFR Odontology, University Montpellier, INSERM, CHU Montpellier, CNRS, Montpellier, France. FAU - Marchi, Nicola AU - Marchi N AD - Cerebrovascular and Glia Research, Department of Neuroscience, Institute of Functional Genomics (UMR 5203 CNRS-U 1191 INSERM, University of Montpellier), Montpellier, France. LA - eng PT - Systematic Review DEP - 20210204 PL - Switzerland TA - Front Neurol JT - Frontiers in neurology JID - 101546899 PMC - PMC7890078 OTO - NOTNLM OT - blood biomarkers OT - concussion OT - epilepsy OT - extreme sports OT - neurodegeneration OT - neurovascular unit OT - saliva OT - traumatic brain injury COIS- DJ was affiliated to the company FloTBI Inc. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. EDAT- 2021/02/23 06:00 MHDA- 2021/02/23 06:01 PMCR- 2021/02/04 CRDT- 2021/02/22 05:53 PHST- 2020/06/29 00:00 [received] PHST- 2020/12/01 00:00 [accepted] PHST- 2021/02/22 05:53 [entrez] PHST- 2021/02/23 06:00 [pubmed] PHST- 2021/02/23 06:01 [medline] PHST- 2021/02/04 00:00 [pmc-release] AID - 10.3389/fneur.2020.577312 [doi] PST - epublish SO - Front Neurol. 2021 Feb 4;11:577312. doi: 10.3389/fneur.2020.577312. eCollection 2020.