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Low-intensity (400 mW/cm2, 500 kHz) pulsed transcranial ultrasound preconditioning may mitigate focal cerebral ischemia in rats
Journal article   Peer reviewed

Low-intensity (400 mW/cm2, 500 kHz) pulsed transcranial ultrasound preconditioning may mitigate focal cerebral ischemia in rats

Hangdao Li, Junfeng Sun, Daqu Zhang, Daryl Omire-Mayor, Peter A. Lewin and Shanbao Tong
Brain stimulation, v 10(3), pp 695-702
May 2017
DOI: https://doi.org/10.1016/j.brs.2017.02.008
PMID: 28279642
Featured in Collection :   UN Sustainable Development Goals @ Drexel
url
https://doaj.org/article/41554512a0d841849076f0757ad0fce5View
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Abstract

Cerebral blood flow Focal cerebral ischemia Low-intensity pulsed ultrasound Neuroprotection Preconditioning Transcranial stimulation
Preconditioning methods, which could increase tolerance of brain to subsequent ischemic injuries with a small dose of non-injury stimuli, have gained attention. Capitalizing on noninvasiveness and safety of ultrasound modality, the pulsed transcranial ultrasound stimulation (pTUS) approach may provide a novel treatment for patients with high risk of stroke. This study's goal was to investigate whether the risk of stroke could be minimized or eliminated by prior exposure to low-intensity, pulsed transcranial ultrasound stimulation (pTUS). Rats were randomly assigned to control (n = 12) and pTUS preconditioning (pTUS-PC) groups (n = 14). The animals in pTUS-PC group were exposed to transcranial ultrasound stimulation before the induction of photothrombotic stroke, whereas control animals were handled identically but without the ultrasound stimulation. Cerebral blood flow was monitored using laser speckle imaging in both groups during stroke induction, as well as 24 and 48 h after stroke, respectively. Also, infarct volumes and edema were measured at 48 h after stroke. pTUS-PC rats had smaller ischemic areas during stroke induction, and 24 and 48 h after the stroke, and smaller infarct volume (1.770 ± 0.169%) than the controls (3.215 ± 0.401%) (p < 0.01). Moreover, the pTUS-PC group experienced lower volume of brain edema than the control group (pTUS-PC rats: 6.658 ± 1.183%; control rats: 12.48 ± 1.386%, p < 0.01). These results support the hypothesis that transcranial ultrasound stimulation applied before photothrombosis could provide neuroprotection by increasing the brain's tolerance to subsequently induced focal ischemic injury. •The risk of stroke could be reduced by low-intensity pulsed transcranial ultrasound stimulation preconditioning (pTUS-PC).•pTUS-PC could delay and alleviate hemodynamic compromise during photothrombosis.•pTUS-PC could improve cerebral blood flow (CBF) restoration 24 and 48 h after photothrombosis.•pTUS-PC could reduce infarct volumes and brain edema after ischemic stroke.

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Collaboration types
Domestic collaboration
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Web of Science research areas
Clinical Neurology
Neurosciences
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