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Axonal damage and behavioral deficits in rats with repetitive exposure of the brain to laser-induced shock waves: Effects of inter-exposure time.
- Source :
-
Neuroscience letters [Neurosci Lett] 2021 Apr 01; Vol. 749, pp. 135722. Date of Electronic Publication: 2021 Feb 13. - Publication Year :
- 2021
-
Abstract
- Much attention has been given to effects of repeated exposure to a shock wave as a possible factor causing severe higher brain dysfunction and post-traumatic stress disorder (PTSD)-like symptoms in patients with mild to moderate blast-induced traumatic brain injury (bTBI). However, it is unclear how the repeated exposure and the inter-exposure time affect the brain. In this study, we topically applied low-impulse (∼54 Pa·s) laser-induced shock waves (LISWs; peak pressure, ∼75.7 MPa) to the rat brain once or twice with the different inter-exposure times (15 min, 1 h, 3 h, 24 h and 7 days) and examined anxiety-related behavior and motor dysfunction in the rats as well as expression of β-amyloid precursor protein (APP) as an axonal damage marker in the brains of the rats. The averaged APP expression scores for the rat brains doubly-exposed to LISWs with inter-exposure times from 15 min to 24 h were significantly higher than those for rats with a single exposure (P < 0.0001). The rats with double exposure to LISWs showed significantly more frequent anxiety-related behavior (P < 0.05) and poorer motor function (P < 0.01) than those of rats with a single exposure. When the inter-exposure time was extended to 7 days, however, the rats showed no significant differences either in axonal damage score or level of motor dysfunction. The results suggest that the cumulative effects of shock wave-related brain injury can be avoided with an appropriate inter-exposure time. However, clinical bTBI occurs in much more complex environments than those in our model. Further study considering other factors, such as the effects of acceleration, is needed to know the clinically-relevant, necessary inter-exposure time.<br /> (Copyright © 2021 Elsevier B.V. All rights reserved.)
- Subjects :
- Animals
Anxiety physiopathology
Axons metabolism
Blast Injuries physiopathology
Brain metabolism
Brain physiopathology
Disease Models, Animal
Rats, Sprague-Dawley
Stress Disorders, Post-Traumatic physiopathology
Rats
Axons drug effects
Behavior, Animal drug effects
Blast Injuries drug therapy
Brain drug effects
Lasers adverse effects
Subjects
Details
- Language :
- English
- ISSN :
- 1872-7972
- Volume :
- 749
- Database :
- MEDLINE
- Journal :
- Neuroscience letters
- Publication Type :
- Academic Journal
- Accession number :
- 33592306
- Full Text :
- https://doi.org/10.1016/j.neulet.2021.135722