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Improvement effects of cyclic peptides from Annona squamosa on cognitive decline in neuroinflammatory mice

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Abstract

Cyclic peptides can resist enzymatic hydrolysis to pass through the intestine barrier, which may reduce the risk of mild cognition decline. But evidence is lacking on whether they work by alleviating neuroinflammation. A cylic peptide from Annona squamosa, Cylic(PIYAG), was biologically evaluated in vivo and in vitro. Cylic(PIYAG) enhanced the spatial memory ability of LPS-induced mice. And treatment with Cylic(PIYAG) markedly reduced the iNOS, MCP-1, TNF-α, and gp91phox expression induced by LPS. Cylic(PIYAG, 0.01, 0.05 and 0.2 μM) could significantly reduce the protein expression level of COX-2 and iNOS (P < 0.05) in BV2 cells. The concentration of Cylic(PIYAG) in blood reached a peak of 3.64 ± 1.22 μg/ml after intragastric administration in 1 h. And fluorescence microscope shows that Cylic(PIYAG) mainly locates and may play an anti-inflammatory role in the cytoplasm of microglia. This study demonstrates that the peptidic can prevent microglia activation, decrease the inflammatory reaction, improve the cognition of LPS-induced mice.

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Acknowledgements

Thanks to the financial support of The Research Fund of Anhui Medical University (A20210020012).

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Authors and Affiliations

  1. Neurology Department, Anqing Medical Center, Anhui Medical University, Anqing, China

    Bo Li & Xueying Shi

  2. Clinical Nutrition Department, Anqing Hospital Affiliated to Anhui Medical University, Anqing, 246000, Anhui, China

    Erhua Chen

  3. Department of Neurology, Graduate School, Anhui Medical University, Hefei, 230000, Anhui, China

    Xiaocui Wu

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  1. Bo Li
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  4. Xiaocui Wu
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Contributions

Con-ceptualization, BL, XW and XS; methodology, BL; software, XW, BL; validation, XW, BL; formal analysis, XW, XS; investigation, BL; resources, BL; data curation, BL; writing-original draft preparation, EC; writing-review and editing, EC; visualization, EC; supervision, EC; project administration, EC; funding acquisition, EC All authors have read and agreed to the published version of the manuscript.

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Correspondence to Xueying Shi or Erhua Chen.

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Li, B., Shi, X., Chen, E. et al. Improvement effects of cyclic peptides from Annona squamosa on cognitive decline in neuroinflammatory mice. Food Sci Biotechnol 33, 1437–1448 (2024). https://doi.org/10.1007/s10068-023-01441-8

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