News Release
Wednesday, July 8, 2020
A study from the National Institutes of Health confirms that neurofilament light chain as a blood biomarker can detect brain injury and predict recovery in multiple groups, including professional hockey players with acute or chronic concussions and clinic-based patients with mild, moderate, or severe traumatic brain injury. The research was conducted by scientists at the NIH Clinical Center, Bethesda, Maryland, andpublished in the July 8, 2020, online issue ofNeurology.
After a traumatic brain injury, neurofilament light chain breaks away from neurons in the brain and collects in the cerebrospinal fluid (CSF). The scientists confirmed that neurofilament light chain also collects in the blood in levels that correlate closely with the levels in the CSF. They demonstrated that neurofilament light chain in the blood can detect brain injury and predict recovery across all stages of traumatic brain injury.
Currently, there are no validated blood-based biomarkers to provide an objective diagnosis of mild traumatic brain injury or to predict recovery, said Leighton Chan, M.D., M.P.H., chief of the Rehabilitation Medicine Department at the NIH Clinical Center. Our study reinforces the need and a way forward for a non-invasive test of neurofilament light chain to aid in the diagnosis of patients and athletes whose brain injuries are often unrecognized, undiagnosed or underreported.
The study examined multiple groups including professional hockey players in Sweden with sports-related concussions, hockey players without concussions, hockey players with persistent post-concussion symptoms, non-athlete controls, and clinic-based patients at the NIH Clinical Center who were healthy or with acute, subacute, and chronic mild traumatic brain injuries. The study showed that neurofilament light chain in the blood:
In the clinic-based patients, the levels of blood neurofilament light chain at five years after a single mild, moderate, or severe traumatic brain injury were significantly increased compared to healthy controls. This suggests that even a single mild traumatic brain injury (without visible signs of structural damage on a standard clinical MRI) may cause long-term brain injury, and serum neurofilament light could be a sensitive biomarker to detect even that far out from initial injury.
This study is the first to do a detailed assessment of serum neurofilament light chain and advanced brain imaging in multiple cohorts, brain injury severities, and time points after injury, said the studys lead author, Pashtun Shahim, M.D., Ph.D., NIH Clinical Center. Our results suggest that serum neurofilament light chain may provide a valuable compliment to imaging by detecting underlying neuronal damage which may be responsible for the long-term symptoms experienced by a significant number of athletes with acute concussions, and patients with more severe brain injuries.
The study was funded by the Intramural Research Program at NIH, the Department of Defense Center for Neuroscience and Regenerative Medicine at the Uniformed Services University, and the Swedish Research Council.
Traumatic brain injury is a major leading cause of death and disability in the United States with more than 2.87 million emergency department visits, hospitalizations and deaths annually. While majority of all traumatic brain injuries are classified as mild (also known as a concussion), it remains difficult to diagnose this condition. There are a wide range of variable behavioral and observational tests to help determine a patients injuries but most of these tests rely on the patient to self-report signs and symptoms. Also, imaging has limitations with detecting micro-structural injuries in the brain.
About the NIH Clinical Center:The NIH Clinical Center is the worlds largest hospital entirely devoted to clinical research. It is a national resource that makes it possible to rapidly translate scientific observations and laboratory discoveries into new approaches for diagnosing, treating, and preventing disease. Over 1,600 clinical research studies are conducted at the NIH Clinical Center, including those focused on cancer, infectious diseases, blood disorders, heart disease, lung disease, alcoholism and drug abuse. For more information about the Clinical Center, visit https://clinicalcenter.nih.gov/index.html.
About the National Institutes of Health (NIH):NIH, the nation's medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit http://www.nih.gov.
NIHTurning Discovery Into Health
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