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Electrical stimulation improved cognitive deficits associated with traumatic brain injury in rats.
Brain and Behavior 2017 November
Introduction: Cognitive deficits associated with traumatic brain injury (TBI) reduce patient quality of life. However, to date, there have been no effective treatments for TBI-associated cognitive deficits. In this study, we aimed to determine whether electrical stimulation (ES) improves cognitive deficits in TBI rats.
Methods: Rats were randomly divided into three groups: the Sham control group, electrical stimulation group (ES group), and No electrical stimulation control group (N-ES group). Following fluid percussion injury, the rats in the ES group received ES treatment for 3 weeks. Potent cognitive function-relevant factors, including the escape latency, time percentage in the goal quadrant, and numbers of CD34+ cells, von Willebrand Factor+ (vWF + ) vessels, and circulating endothelial progenitor cells (EPCs), were subsequently assessed using the Morris water maze (MWM) test, immunohistochemical staining, and flow cytometry.
Results: Compared with the rats in the N-ES group, the rats in the ES group exhibited a shorter escape latency on day 3 ( p = .025), day 4 ( p = .011), and day 5 ( p = .003), as well as a higher time percentage in the goal quadrant ( p = .025) in the MWM test. After 3 weeks of ES, there were increased numbers of CD34+ cells ( p = .008) and vWF + vessels ( p = .000) in the hippocampus of injured brain tissue in the ES group compared with those in the N-ES group. Moreover, ES also significantly increased the number of EPCs in the peripheral blood from days 3 to 21 after TBI in the ES group ( p < .05).
Conclusions: Taken together, these findings suggest that ES may improve cognitive deficits induced by TBI, and this protective effect may be a result, in part, of enhanced angiogenesis, which may be attributed to the increased mobilization of EPCs in peripheral blood.
Methods: Rats were randomly divided into three groups: the Sham control group, electrical stimulation group (ES group), and No electrical stimulation control group (N-ES group). Following fluid percussion injury, the rats in the ES group received ES treatment for 3 weeks. Potent cognitive function-relevant factors, including the escape latency, time percentage in the goal quadrant, and numbers of CD34+ cells, von Willebrand Factor+ (vWF + ) vessels, and circulating endothelial progenitor cells (EPCs), were subsequently assessed using the Morris water maze (MWM) test, immunohistochemical staining, and flow cytometry.
Results: Compared with the rats in the N-ES group, the rats in the ES group exhibited a shorter escape latency on day 3 ( p = .025), day 4 ( p = .011), and day 5 ( p = .003), as well as a higher time percentage in the goal quadrant ( p = .025) in the MWM test. After 3 weeks of ES, there were increased numbers of CD34+ cells ( p = .008) and vWF + vessels ( p = .000) in the hippocampus of injured brain tissue in the ES group compared with those in the N-ES group. Moreover, ES also significantly increased the number of EPCs in the peripheral blood from days 3 to 21 after TBI in the ES group ( p < .05).
Conclusions: Taken together, these findings suggest that ES may improve cognitive deficits induced by TBI, and this protective effect may be a result, in part, of enhanced angiogenesis, which may be attributed to the increased mobilization of EPCs in peripheral blood.
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