1. Curcumin relieves arecoline‐induced oral submucous fibrosis via inhibiting the LTBP2/NF‐κB axis.
- Author
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Zhang, Lin, Tan, Jin, Liu, Yiping, and Luo, Mang
- Subjects
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NF-kappa B , *FLOW cytometry , *CARRIER proteins , *CELL proliferation , *CELL physiology , *APOPTOSIS , *ENZYME-linked immunosorbent assay , *ORAL mucosa , *CELLULAR signal transduction , *CELL motility , *TRANSCRIPTION factors , *ORAL diseases , *FIBROSIS , *PLANT extracts , *FIBROBLASTS , *GENES , *CURCUMIN , *WESTERN immunoblotting , *HYPOXEMIA - Abstract
Background: Submucosal fibrosis (OSF) of the oral cavity is a chronic scarring disease. Arecoline (Are) is the driving factor for the occurrence and deterioration of OSF. Curcumin plays a vital anti‐inflammatory role in Are‐induced OSF development. However, its potential pharmacological mechanism needs to be elucidated. Methods: The relative molecular level was measured via qRT‐PCR or Western blot. MTT assay, transwell assay and flow cytometry detected cell proliferation, migration, and apoptosis. The correlation between hypoxia‐inducible factor‐1α (HIF‐1α) and LTBP2 promoter was confirmed through dual‐luciferase reporter assay. ELISA was performed to detect inflammatory cytokines levels. Results: Curcumin alleviated Are‐induced oral mucosal fibroblast cells fibrosis by reducing oral mucosa fibroblasts viability, promoting cell apoptosis, suppressing cell migration, and down‐regulating the levels of fibrosis markers and inflammatory factors. Curcumin relieved Are‐induced OSF via inhibiting HIF‐1α. Mechanically, HIF‐1α bound to the promoter of LTBP2 to transcriptionally activated LTBP2. LTBP2 knockdown relieved Are‐induced OSF, and curcumin down‐regulated LTBP2 via inhibiting HIF‐1α to relieve Are‐induced OSF. Moreover, curcumin decreased NF‐κB signal associated proteins via inhibiting LTBP2 to relieve Are‐induced OSF. Conclusion: Curcumin reduced the transcription level of LTBP2 by inhibiting HIF‐1α, thereby inactivating NF‐κB pathway to alleviate Are‐induced OSF. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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