Low-Intensity Focused Ultrasound Alleviates Spasticity and Increases Expression of the Neuronal K-Cl Cotransporter in the L4-L5 Sections of Rats Following Spinal Cord Injury

Low-intensity focused ultrasound (LIFU) has been shown to provide effective activation of the spinal cord neurocircuits. The aim of this study was to investigate the effects of LIFU in order to alleviate spasticity following spinal cord injury (SCI) by activating the spinal neurocircuits and increas...

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Published in:Frontiers in cellular neuroscience 2022-05, Vol.16, p.882127-882127
Main Authors: Liao, Ye-Hui, Chen, Mo-Xian, Chen, Shao-Chun, Luo, Kai-Xuan, Wang, Bing, Ao, Li-Juan, Liu, Yao
Format: Article
Language:English
Subjects:
Animals
Cellular Neuroscience
Electromyography
Frequency dependence
Immunofluorescence
KCC2
low-intensity focused ultrasound
Medical research
Muscle contraction
Muscle pain
Nervous system
neurocircuits
Neurons
Pathogenesis
Potassium-chloride cotransporter
Spasticity
Spinal cord injuries
spinal cord injury
Ultrasonic imaging
Ultrasound
Urination
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Summary:Low-intensity focused ultrasound (LIFU) has been shown to provide effective activation of the spinal cord neurocircuits. The aim of this study was to investigate the effects of LIFU in order to alleviate spasticity following spinal cord injury (SCI) by activating the spinal neurocircuits and increasing the expression of the neuronal K-Cl cotransporter KCC . Adult male Sprague Dawley (SD) rats (220-300 g) were randomly divided into a sham control group, a LIFU group, and a LIFU group. The mechanical threshold hold (g) was used to evaluate the behavioral characteristics of spasm. Electromyography (EMG) was used to assess activation of the spinal cord neurocircuits and muscle spontaneous contraction. Spasticity was assessed by frequency-dependent depression (FDD). The expression of KCC of the lumbar spinal cord was determined via western blot (WB) and immunofluorescence (IF) staining. The spinal cord neurocircuits were activated by LIFU simulation, which significantly reduced the mechanical threshold (g), FDD, and EMG recordings (s) after 4 weeks of treatment. WB and IF staining both demonstrated that the expression of KCC was reduced in the LIFU group ( < 0.05). After 4 weeks of LIFU stimulation, expression of KCC had significantly increased ( < 0.05) in the LIFU group compared with the LIFU group. Thus, we hypothesized that LIFU treatment can alleviate spasticity effectively and upregulate the expression of KCC in the L4-L5 section of SCI rats.
ISSN:1662-5102
1662-5102
DOI:10.3389/fncel.2022.882127