Abstract
Neuroinflammation is considered an important factor that leads to cognitive impairment. Microglia play a crucial role in neuroinflammation, which leads to cognitive impairment. This study aimed at determining whether temporin-GHaR peptide (GHaR) could improve cognitive function and at uncovering the underlying mechanisms. We found that GHaR treatment alleviated LPS-induced cognitive impairment and inhibited activation of microglia in LPS-induced mice. Furthermore, GHaR inhibited activation of endoplasmic reticulum stress (ERS) and the NF-κB signaling pathway in LPS-induced mice. In vitro, GHaR inhibited M1 polarization of BV2 cells and suppressed TNF-α and IL-6 secretion. Additionally, GHaR neuronal cell viability and apoptosis were induced by LPS-activated microglia-conditioned medium. Moreover, in LPS-induced BV2 cells, GHaR inhibited activation of ERS and the NF-κB signaling pathway. In summary, GHaR improved LPS-induced cognitive and attenuated inflammatory responses via microglial activation reversal. In conclusion, the neuroprotective effects of GHaR were mediated via the ERS signaling pathway.
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Funding
This study was supported by grants from the National Natural Science Foundation of China (82104129 to R.W. and 82260250 to DQ.Z.), the Hainan provincial natural science foundation of China (322RC584 to R.W., 820MS140 to DQ.Z.), the Hainan Province Science and Technology Special Fund, Key Research and Development Project of Hainan Province (ZDYF2022SHFZ294 to DQ.Z. and ZDYF2021SHFZ042 to YX.Z.), the Project supported by Hainan Province Clinical Medical Center, and the Foundation of Collaborative Innovation Center of One Health of Hainan University (XTCX2022JKB05 to YX.Z.).
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Da-Qi Zhang: Performed the experiments; Analyzed and interpreted the data; Wrote the paper. Xiaoqian Dong, Simin Su, Linlin Zhang,Jiayu Zhang and Wenjing Yang: Performed the experiments; Analyzed and interpreted the data. Wenting Hu, Lushuang Li , Yanting Song, Xi Xie and Qifu Li: Analyzed and interpreted the data ; review & editing the paper. Rong Wang, Yingxia Zhang: Conceived and designed the experiments.All authors reviewed the manuscript.
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Zhang, DQ., Dong, X., Su, S. et al. Temporin-GHaR Peptide Alleviates LPS-Induced Cognitive Impairment and Microglial Activation by Modulating Endoplasmic Reticulum Stress. Probiotics & Antimicro. Prot. (2024). https://doi.org/10.1007/s12602-024-10277-5
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DOI: https://doi.org/10.1007/s12602-024-10277-5