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Structural Characterization and Immune Activation Capacity of Peptidoglycan from Corynebacterium glutamicum in RAW264.7 Cells

文献类型： 外文期刊

作者： Xiaoying Wang;Shuzhen Li;Aijuan Zheng;Zhimin Chen;Jiang Chen;Zhiheng Zou;Guohua Liu

作者机构：

关键词： Corynebacterium glutamicum;cytokines;immune activation;peptidoglycan;RAW264.7 cells

期刊名称： International Journal of Molecular Sciences

ISSN： 1661-6596

年卷期： 2025 年 26 卷 1 期

页码：

收录情况： SCIE（2025版）

摘要： Peptidoglycan (PGN) is a unique component of prokaryotic cell walls with immune-enhancing capacities. Here, we extracted PGN from Corynebacterium glutamicum, a by-product of amino acid fermentation, using the trichloroacetic acid (TCA) method. SDS-PAGE analysis confirmed the presence of PGN, with a band of approximately 28 kDa. Further analysis was conducted through amino acid analysis, FTIR, and MALDI-TOF/TOF MS, and the results showed that the chemical structural monomer of PGN is NAG-(β-1,4-)-NAM-l-Ala-d-Glu-l-Lis-d-Ala. The immune activation effects of PGN were evaluated in a RAW264.7 cell model. Our results showed that PGN could increase the secretion level of NO, ROS, and immune regulatory substances, including TNF-α and IL-1β, and up-regulated the mRNA expression of TNF-α and iNOS. In addition, PGN stimulated the expression of ERK2, MyD88, RIP2, and the related receptor NOD1 in the NF-κB and MAPK pathways. Comparative RNA sequencing was conducted to analyze the gene expression profiles in RAW264.7 cells. KEGG analysis indicated that most of the genes were enriched in the NF-κB, MAPK, and TNF signaling pathways. Taken together, these findings suggest that PGN may have immune-activating potential for the development and application of immune adjuvants. Importantly, the application of PGN also provides a new way to utilize amino acid fermentation by-products.

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