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Neurocritical Care
Published in: Neurocritical Care 3/2017

01-06-2017 | Original Article

Autophagy Biomarkers Beclin 1 and p62 are Increased in Cerebrospinal Fluid after Traumatic Brain Injury

Published in: Neurocritical Care | Issue 3/2017

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Abstract

Background

Autophagy is a process that recycles damaged proteins and organelles. Beclin 1 is involved in the nucleation phase, while p62 is consumed during the elongation phase. We hypothesized that these autophagy biomarkers are increased in cerebrospinal fluid (CSF) after traumatic brain injury (TBI) in children and associated with unfavorable outcome.

Methods

Thirty children with severe TBI had CSF collected on days 1, 3, and 7. Patients without TBI or meningoencephalitis served as controls. Beclin 1 and p62 were measured by ELISA. Outcome was assigned 6 months after injury (Glasgow Outcome Scale score; GOS).

Results

Mean and peak CSF beclin 1 and p62 levels were increased compared to controls (P < 0.05). Peak p62 levels were higher in patients with unfavorable versus favorable outcome (0.79 ± 1.03 vs. 0.17 ± 0.54 ng/ml, respectively; mean ± SD, P = 0.002) and were independently associated with outcome when controlling for age and initial Glasgow Coma Scale score (P = 0.019; AUC 0.88, 95% CI 0.76, 1.00).

Conclusions

Beclin 1 and p62 are increased in CSF after TBI, suggesting increased autophagy with impairment of, and/or exceeding the capacity for, autophagic flux. The association of increased p62 with unfavorable outcome suggests that autophagy in excess of the capacity to clear degradation products may be deleterious after TBI.
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Metadata
Title
Autophagy Biomarkers Beclin 1 and p62 are Increased in Cerebrospinal Fluid after Traumatic Brain Injury
Publication date
01-06-2017
Published in
Neurocritical Care / Issue 3/2017
Print ISSN: 1541-6933
Electronic ISSN: 1556-0961
DOI
https://doi.org/10.1007/s12028-016-0351-x

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