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• W2099284983 abstract "Background and Objective: Arecoline, an arecanut alkaloid present in the saliva of betel quid chewers, has been implicated in the pathogenesis of a variety of inflammatory oral diseases, including oral submucous fibrosis and periodontitis. To understand the molecular basis of arecoline action in epithelial changes associated with these diseases, we investigated the effects of arecoline on human keratinocytes with respect to cell growth regulation and the expression of stress‐responsive genes. Material and Methods: Human keratinocyte cells (of the HaCaT cell line) were treated with arecoline, following which cell viability was assessed using the Trypan Blue dye‐exclusion assay, cell growth and proliferation were analyzed using the MTT (3‐[4,5‐dimethylthiazol‐2‐yl]‐2,5‐diphenyltetrazolium bromide) and 5‐bromo‐2‐deoxyuridine incorporation assays, cell cycle arrest and generation of reactive oxygen species were examined using flow cytometry, and gene expression changes were investigated using the reverse transcription–polymerase chain reaction technique. The role of oxidative stress, muscarinic acetylcholine receptor and mitogen‐activated protein kinase (MAPK) pathways were studied using specific inhibitors. Western blot analysis was performed to study p38 MAPK activation. Results: Arecoline induced the generation of reactive oxygen species and cell cycle arrest at the G1/G0 phase in HaCaT cells without affecting the expression of p21/Cip1. Arecoline‐induced epithelial cell death at higher concentrations was caused by oxidative trauma without eliciting apoptosis. Sublethal concentrations of arecoline upregulated the expression of the following stress‐responsive genes: heme oxygenase‐1; ferritin light chain; glucose‐6‐phosphate dehydrogenase; glutamate‐cysteine ligase catalytic subunit; and glutathione reductase. Additionally, there was a dose‐dependent induction of interleukin‐1alfa mRNA by arecoline via oxidative stress and p38 MAPK activation. Conclusion: Our data highlight the role of oxidative stress in arecoline‐mediated cell death, gene regulation and inflammatory processes in human keratinocytes." @default.
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• W2099284983 date "2009-08-21" @default.
• W2099284983 modified "2023-10-16" @default.
• W2099284983 title "Regulation of oxidative-stress responsive genes by arecoline in human keratinocytes" @default.
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• W2099284983 doi "https://doi.org/10.1111/j.1600-0765.2008.01176.x" @default.
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