Related Experiment Videos
Traumatic brain injury does not alter cerebral artery contractility
R D Bukoski1, S N Wang, K Bian
1Department of Internal Medicine, University of Texas Medical Branch, Galveston 77555-1065, USA.
The American Journal of Physiology
|March 1, 1997
Summary
Traumatic brain injury (TBI) did not impair the intrinsic contractile activity of rat cerebral arteries. This study found no changes in force generation or relaxation responses following TBI, suggesting other mechanisms are involved.
Area of Science:
- Neuroscience
- Vascular Biology
- Trauma Research
Background:
- Traumatic brain injury (TBI) is known to reduce cerebral blood flow and vascular reactivity.
- Previous research suggests TBI may impair the intrinsic contractile function of cerebral arteries.
Purpose of the Study:
- To test the hypothesis that TBI impairs the intrinsic contractile activity of cerebral arteries.
- To investigate the effects of TBI on serotonin- and K+-induced force generation and acetylcholine-induced relaxation in rat cerebral arteries.
Main Methods:
- Rats underwent moderate or severe midline fluid percussion TBI or sham injury.
- Posterior cerebral or middle cerebral arteries were isolated to measure isometric force generation.
- Vascular responses were assessed at 10 and 30 minutes post-injury, with and without endothelial function assessment and cyclooxygenase blockade.
Main Results:
- Moderate and severe TBI did not affect serotonin- or K+-induced force generation or sensitivity in arteries isolated within 10 minutes.
- Endothelial disruption and cyclooxygenase blockade did not alter serotonin-induced responses post-TBI.
- Acetylcholine-induced relaxation was unaffected by moderate TBI at both 10 and 30 minutes post-injury.
Conclusions:
- Midline fluid percussion TBI in rats does not appear to affect the intrinsic contraction or relaxation of proximal middle or posterior cerebral arteries.
- The study suggests that TBI-induced reductions in cerebral blood flow and vascular reactivity are not mediated by direct impairment of cerebral artery contractility.