Abstract
Gingival wound healing plays a critical role in maintaining oral health. However, this process can be delayed by oxidative stress and excessive inflammatory responses. In this study, we established a human inflammatory gingival tissue equivalent (iGTE) to investigate the inhibitory effects of hydrogen-rich water (HW), enzyme-digested edible bird’s nest (EBND) and sialic acid (SA) on PMA (an inducer of oxidative free radicals)- and LPS (an inflammatory stimulus)-impaired wound healing. The iGTE was constructed by human gingival fibroblasts (hGFs), keratinocytes and macrophages under three-dimensional conditions. Wounds in the iGTE and hGF/keratinocyte monolayers were created by mechanical injury. Tissues and cells were pretreated with HW, EBND, and SA, and then exposed to the inflammatory and oxidative environment induced by PMA (10 ng/mL) and LPS (250 ng/mL). The inflammatory cytokines IL-6 and IL-8 were quantitatively analyzed by ELISA. Histopathological image analysis was performed by HE and immunofluorescence staining. In the iGTE, PMA/LPS significantly reduced the epithelial thickness while causing a decrease in K8/18, E-cadherin, laminin and elastin expression and an increase in COX-2 expression along with ulcer-like lesions. In mechanically scratched hGFs and keratinocyte monolayers, PMA/LPS significantly impaired wound healing, and promoted the secretion of IL-6 and IL-8. Pretreatment of HW, EBND, and SA significantly suppressed PMA/LPS-induced wound healing delay and inflammatory responses in cell monolayers, as well as in the iGTE. Remarkably, the combined use of HW and EBND exhibited particularly robust results. Combined use of HW and EBND may be applied for the prevention and treatment of wound healing delay.
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The data presented in this study are available within the article. Other data related to this study are available on request from the corresponding author.
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Acknowledgements
This research was funded by JSPS KAKENHI Grant-in-Aid for Scientific Research (No. 22K10009 to L.X.; No. 21K21025 to N.S.). The administrative support and advice from Chikako Saiki, as well as Katsuhisa Sunada, are sincerely appreciated by the authors. Technical support from staffs in the Research Center for Odontology, School of Life Dentistry at Tokyo, The Nippon Dental University, are acknowledged by the authors. The authors also express gratitude to Nathaniel Green for his proofreading.
Funding
This research was funded by JSPS KAKENHI Grant-in-Aid for Scientific Research (No. 22K10009 to L.X.; No. 21K21025 to N.S.).
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D.W. is an employee of Beijing Xiaoxiandun Biotechnology Co., Ltd. No other author has reported a potential conflict of interest relevant to this article.
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Wang, D., Shimamura, N., Miwa, N. et al. Combined use of hydrogen-rich water and enzyme-digested edible bird’s nest improves PMA/LPS-impaired wound healing in human inflammatory gingival tissue equivalents. Human Cell (2024). https://doi.org/10.1007/s13577-024-01065-y
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DOI: https://doi.org/10.1007/s13577-024-01065-y