Masae Furukawa1, Jingshu Wang1, Mie Kurosawa1, Noboru Ogiso2, Yosuke Shikama1, Takuro Kanekura3, Kenji Matsushita4. 1. Department of Oral Disease Research, National Center for Geriatrics and Gerontology, 7-430 Morioka-cho, Obu City, Aichi, 474-8511, Japan. 2. Department of Laboratory of Experimental Animals, National Center for Geriatrics and Gerontology, 7-430 Morioka-cho, Obu City, Aichi, 474-8511, Japan. 3. Department of Dermatology, Graduate School of Medical and Dental Sciences, Kagoshima University, 8-35-1, Sakuragaoka, Kagoshima City, Kagoshima, 890-8520, Japan. 4. Department of Oral Disease Research, National Center for Geriatrics and Gerontology, 7-430 Morioka-cho, Obu City, Aichi, 474-8511, Japan. Electronic address: kmatsu30@ncgg.go.jp.
Abstract
OBJECTIVES: Tooth bleaching has become one of the most frequently requested esthetic procedures in dental practice. A side effect of bleaching is gingival irritation. This study examined the efficacy of propolis to treat gingival irritation caused by bleaching in vivo and in vitro. METHODS: Gingival irritation was mimicked by a mild burn injury to oral mucosa in young (10 week old) and aged (18 month old) mice. Propolis ointment was immediately applied to the burn area. After 24 h, gingiva was collected to determine the efficacy of propolis by hematoxylin and eosin staining and real-time polymerase chain reaction (PCR). RESULTS: Topical application of propolis ointment reduced the infiltration of inflammatory cells at irritated sites and promoted the repair of the mucosal epithelium in young and aged mice. It also suppressed the expression of IL-1β and TNF-α and increased keratin 1 and 5 expression in the irritated gingiva. Propolis suppressed an increase in IL-1β and TNF-α upon stimulation with H2O2 in young and SA-β-gal-expressing senescent human gingival fibroblasts (HGFs) cultures. CONCLUSIONS: Propolis may be effective for mucosal repair in gingival irritation as it suppresses the expression of proinflammatory cytokines and promotes keratin expression.
OBJECTIVES:Tooth bleaching has become one of the most frequently requested esthetic procedures in dental practice. A side effect of bleaching is gingival irritation. This study examined the efficacy of propolis to treat gingival irritation caused by bleaching in vivo and in vitro. METHODS:Gingival irritation was mimicked by a mild burn injury to oral mucosa in young (10 week old) and aged (18 month old) mice. Propolis ointment was immediately applied to the burn area. After 24 h, gingiva was collected to determine the efficacy of propolis by hematoxylin and eosin staining and real-time polymerase chain reaction (PCR). RESULTS: Topical application of propolis ointment reduced the infiltration of inflammatory cells at irritated sites and promoted the repair of the mucosal epithelium in young and aged mice. It also suppressed the expression of IL-1β and TNF-α and increased keratin 1 and 5 expression in the irritated gingiva. Propolis suppressed an increase in IL-1β and TNF-α upon stimulation with H2O2 in young and SA-β-gal-expressing senescent human gingival fibroblasts (HGFs) cultures. CONCLUSIONS: Propolis may be effective for mucosal repair in gingival irritation as it suppresses the expression of proinflammatory cytokines and promotes keratin expression.