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Objective. To investigate the effect of Mn3O4 nanoparticles (Mn3O4NPs) on inflammatory factors induced by lipopolysaccharide (LPS) in human tendon cells and its mechanism. Methods. The Mn3O4NPs were synthesized by a hydrothermal method. RT-qPCR was used to detect the expression levels of miRNAs related to inflammation in human tendon cells. The expression level of NLRP1 (NOD-like receptor containing pyrin domain 1) was measured by Western blotting. ELISA assay was used to measure the level of TNF-α, IL-1β, IL-4, and IL-10. The relationship between miR-181a-5p and NLRP1 was verified by dual-luciferase reporter assay. Results. Mn3O4NPs produced in this study were brown spherical particles with an average size of 7-10 nm. Mn3O4NP treatment significantly reduced the levels of TNF-α and IL-1β but increased the levels of IL-4 and IL-10 in the human tendon cells induced by LPS. In addition, Mn3O4NP treatment remarkably increased the expression level of miR-181a-5p. NLRP1 is one of the targets of miR-181a-5p, and miR-181a-5p downregulated its expression. Further study showed that Mn3O4NPs could alleviate the inflammatory response of human tendon cells induced by LPS by upregulating miR-181a-5p and thus downregulating the expression of NLRP1. Conclusion. Mn3O4NPs affect the expression of inflammatory cytokines in the human tendon cells induced by LPS by modulating the molecular axis of miR-181a-5p/NLRP1.

Effect of Mn3O4 Nanoparticles on Lipopolysaccharide-Induced Inflammatory Factors in the Human Tendon Cells and Its Mechanism

Effect of Mn₃O₄ Nanoparticles on Lipopolysaccharide-Induced Inflammatory Factors in the Human Tendon Cells and Its Mechanism