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Treatment with Rapamycin in Animal Models of Traumatic Brain Injuries; a Systematic Review and Meta-Analysis.
INTRODUCTION: In light of the potential of enhanced functional and neurological recovery in traumatic brain injury (TBI) with the administration of rapamycin, this systematic review and meta-analysis aimed to investigate the efficacy of rapamycin treatment in animal models of TBI.
METHODS: An extensive search was conducted in the electronic databases of Medline, Embase, Scopus, and Web of Science by July 1st , 2023. Two independent researchers performed the screening process by reviewing the titles and abstracts and the full texts of the relevant articles, including those meeting the inclusion criteria. Apoptosis rate, inflammation, locomotion, and neurological status were assessed as outcomes. A standardized mean difference (SMD) with a 95% confidence interval (95%CI) was calculated for each experiment, and a pooled effect size was reported. Statistical analyses were performed using STATA 17.0 software.
RESULTS: Twelve articles were deemed eligible for inclusion in this meta-analysis. Pooled data analysis indicated notable reductions in the number of apoptotic cells (SMD for Tunnel-positive cells = -1.60; 95%CI: -2.21, -0.99, p<0.001), p-mTOR (SMD=-1.41; 95%CI: -2.03, -0.80, p<0.001), and p-S6 (SMD=-2.27; 95%CI: -3.03, -1.50, p<0.001) in TBI post-treatment. Our analysis also indicated substantial IL-1β reductions after rapamycin administration (SMD= -1.91; 95%CI: -2.61, -1.21, p<0.001). Moreover, pooled data analysis found significant neurological severity score (NSS) improvements at 24 hours (SMD= -1.16; 95%CI: -1.69, -0.62, p<0.001; I²=0.00%), 72 hours (SMD= -1.44; 95%CI: -2.00, -0.88, p<0.001; I²=0.00%), and 168 hours post-TBI (SMD= -1.56; 95%CI: -2.44, -0.68, p<0.001; I²=63.37%). No such improvement was observed in the grip test.
CONCLUSION: Low to moderate-level evidence demonstrated a significant decrease in apoptotic and inflammatory markers and improved neurological status in rodents with TBI. However, no such improvements were observed in locomotion recovery.
METHODS: An extensive search was conducted in the electronic databases of Medline, Embase, Scopus, and Web of Science by July 1st , 2023. Two independent researchers performed the screening process by reviewing the titles and abstracts and the full texts of the relevant articles, including those meeting the inclusion criteria. Apoptosis rate, inflammation, locomotion, and neurological status were assessed as outcomes. A standardized mean difference (SMD) with a 95% confidence interval (95%CI) was calculated for each experiment, and a pooled effect size was reported. Statistical analyses were performed using STATA 17.0 software.
RESULTS: Twelve articles were deemed eligible for inclusion in this meta-analysis. Pooled data analysis indicated notable reductions in the number of apoptotic cells (SMD for Tunnel-positive cells = -1.60; 95%CI: -2.21, -0.99, p<0.001), p-mTOR (SMD=-1.41; 95%CI: -2.03, -0.80, p<0.001), and p-S6 (SMD=-2.27; 95%CI: -3.03, -1.50, p<0.001) in TBI post-treatment. Our analysis also indicated substantial IL-1β reductions after rapamycin administration (SMD= -1.91; 95%CI: -2.61, -1.21, p<0.001). Moreover, pooled data analysis found significant neurological severity score (NSS) improvements at 24 hours (SMD= -1.16; 95%CI: -1.69, -0.62, p<0.001; I²=0.00%), 72 hours (SMD= -1.44; 95%CI: -2.00, -0.88, p<0.001; I²=0.00%), and 168 hours post-TBI (SMD= -1.56; 95%CI: -2.44, -0.68, p<0.001; I²=63.37%). No such improvement was observed in the grip test.
CONCLUSION: Low to moderate-level evidence demonstrated a significant decrease in apoptotic and inflammatory markers and improved neurological status in rodents with TBI. However, no such improvements were observed in locomotion recovery.
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