1. Protein hydrolysate from Atlantic salmon (Salmo salar) improves aging-associated neuroinflammation and cognitive decline in rats by reshaping the gut microbiota and Th17/Treg balance.
- Author
-
Guan MQ, Yu L, Gu H, Fu Q, Liu MM, Li K, Yang XR, Framroze B, Guo JH, Wei JJ, and Li YL
- Abstract
As the global population ages, cognitive decline in older adults has gained significant attention in public health, underscoring the urgent need for effective intervention strategies. This study investigates the impact of salmon protein hydrolysate (SPH) on gut microbiota and cognitive decline in aged rats. Over 8 weeks, aged Sprague-Dawley rats were treated with SPH, resulting in significant enhancements in cognitive function as evidenced by operant-based attentional set-shifting and Morris water maze tasks. SPH modulated microglial activation in the hippocampus, reducing M1 polarization and promoting M2 polarization. RT-PCR analysis indicated a decrease in pro-inflammatory cytokines and an increase in anti-inflammatory cytokines, suggesting a reduction in neuroinflammation. Additionally, 16S rRNA gene sequencing revealed that SPH transformed gut microbiota, increasing Bacteroidetes and decreasing Proteobacteria. The bacterial genera Prevotella, Bacteroidetes and Ruminococcus showed notable increases. Furthermore, SPH intervention can also increase the concentrations of certain short-chain fatty acids (SCFAs) in aged rats. Additionally, SPH also restored the Th17/Treg balance and decreased peripheral inflammation. This study offers compelling evidence for SPH as a functional food that may mitigate cognitive decline due to aging., Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Yan-Li Li reports financial support was provided by National Natural Science Foundation of China. Yan-Li Li reports financial support was provided by Natural Science Foundation of Shanxi Province. Yan-Li Li reports financial support was provided by Start-up Fund for Doctor of Shanxi Medical University. Yan-Li Li reports financial support was provided by Shanxi Province Higher Education Billion Project. Jing-Jing Wei reports financial support was provided by Hofseth BioCare AS. Aalesund. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2025 The Author(s). Published by Elsevier B.V. All rights reserved.)
- Published
- 2025
- Full Text
- View/download PDF