Antioxidants counteract nicotine and promote migration via RacGTP in oral fibroblast cells

Journal of Periodontology
Symone M San MiguelKathy K H Svoboda

Abstract

Smoking is associated with an increased risk of oral health and dental problems. The aim of this study is to address the hypothesis that nicotine impairs wound healing by increasing reactive oxygen species and inhibiting cell migration, and antioxidants (AOs) may counteract nicotine effects. Primary human gingival fibroblasts (HGFs) and human periodontal ligament (HPDL) fibroblasts were grown to confluence, pretreated with 6 mM nicotine for 2 hours, and treated with AOs in the presence of nicotine. The pure AO compounds ferulic acid (F), phloretin (P), tetrahydrocurcuminoid Cockroft Gault (T), and resveratrol (R) were tested in single, double, or triple combinations (10(-5) M). The migratory behavior at a scratch-wound edge was recorded every 15 minutes for 10 hours by using live-cell imaging. The active form of the Rho-associated protein (Rac) and guanosine triphosphate (GTP) (RacGTP) was immunolabeled and analyzed using confocal microscopy. Combinations of double and triple AOs had a greater effect than single AOs on migration rates and Rac activation. The triple combinations PFR and RFT clearly and unambiguously counteracted the effects of nicotine and significantly increased migration rates in HGF and HPDL fibroblast. Treat...Continue Reading

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