Abstract
Peripheral surgery-induced neural inflammation is a key pathogenic mechanism of postoperative cognitive dysfunction (POCD). However, the mechanism underlying neuroinflammation and associated neural injury remains elusive. Surgery itself can lead to gut damage, and the occurrence of POCD is accompanied by high levels of TNF-α in the serum and blood‒brain barrier (BBB) damage. Reductions in stress, inflammation and protein loss have been emphasized as strategies for enhanced recovery after surgery (ERAS). We designed an amino acids and dipeptide (AAD) formula for injection that could provide intestinal protection during surgery. Through the intraoperative infusion of AAD based on the ERAS concept, we aimed to explore the effect of AAD injection on POCD and its underlying mechanism from the gut to the brain. Here, we observed that AAD injection ameliorated neural injury in POCD, in addition to restoring the function of the intestinal barrier and BBB. We also found that TNF-α levels decreased in the ileum, blood and hippocampus. Intestinal barrier protectors and TNF-α inhibitors also alleviated neural damage. AAD injection treatment decreased HMGB1 production, pyroptosis, and M1 microglial polarization and increased M2 polarization. In vitro, AAD injection protected the impaired gut barrier and decreased TNF-α production, alleviating damage to the BBB by stimulating cytokine transport in the body. HMGB1 and Caspase-1 inhibitors decreased pyroptosis and M1 microglial polarization and increased M2 polarization to protect TNF-α-stimulated microglia in vitro. Collectively, these findings suggest that the gut barrier–TNF-α–BBB–HMGB1–Caspase-1 inflammasome–pyroptosis–M1 microglia pathway is a novel mechanism of POCD related to the gut–brain axis and that intraoperative AAD infusion is a potential treatment for POCD.
Graphical Abstract
According to our findings, AAD injection, which is based on the ERAS concept, alleviates POCD by decreasing the activity of the gut barrier–TNF‐α–BBB–HMGB1–Caspase-1 inflammasome–pyroptosis–M1 microglial axis
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Data Availability
The authors declare that all the data supporting the findings of this study are available within the article.
Abbreviations
- POCD:
-
Postoperative cognitive dysfunction
- ERAS:
-
Enhan
ced recovery after surgery
- BBB:
-
Blood–brain barrier
- AAD:
-
Amino acid and dipeptide
- HMGB1:
-
High mobility group box-1
- HE:
-
Hematoxylin–eosin
- IHC:
-
Immunohistochemistry
- IF:
-
Immu
nofluorescence
- CCK-8:
-
Cell counting kit-8
- MMP:
-
Mitochondrial membrane potential
- DCFH-DA:
-
Dichlorodihydrofluorescein diacetate
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Acknowledgements
We would like to thank the laboratory at Zhongshan Hospital, Fudan University, for their support of our study.
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This study was supported by grants from the Shanghai Municipal Key Clinical Specialty (shslczdzk03603) and the Research Program of Zhongshan Hospital, Fudan University (2021ZSCX27).
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Shengjin Ge designed the overall project and supervised the study; Shengjin Ge, Yelong Ji and Yuanyuan Ma designed the experiments; Yelong Ji, Li Xu and Yimei Ma performed the in vivo experiments; Yelong Ji and Xining Zhao performed the in vitro experiments; Yelong Ji and Ying Wang performed the formal analysis; and Yelong Ji and Yuanyuan Ma wrote the paper with input from the other authors; Shengjin Ge reviewed and supervised the paper. All authors have read and agreed to the published version of the manuscript.
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All animal procedures were conducted in accordance with the Guidelines for Care and Use of Laboratory Animals of Fudan University, and all efforts were made to minimize animal suffering. The study protocol was approved by the Ethics Committee of the Affiliated Zhongshan Hospital, Fudan University (approval: 202106021 S).
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Ji, Y., Ma, Y., Ma, Y. et al. An Amino Acids and Dipeptide Injection Inhibits the TNF-α/HMGB1 Inflammatory Signaling Pathway to Reduce Pyroptosis and M1 Microglial Polarization in POCD Mice: the Gut to the Brain. Mol Neurobiol (2024). https://doi.org/10.1007/s12035-024-04209-1
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DOI: https://doi.org/10.1007/s12035-024-04209-1