Abstract
Background
Chimpi, the dried peel of Citrus unshiu or Citrus reticulata, has various pharmacological effects. Chimpi extract was recently shown to affect the skin, including its inhibitory effect against atopic dermatitis. In this study, we analyzed the effects of Chimpi extract on the functional molecule aquaporin-3 (AQP3), which is involved in water transport and cell migration in the skin.
Methods and Results
Chimpi extract was added to HaCaT human skin keratinocytes, and the AQP3 expression level was analyzed. A wound healing assay was performed to evaluate the effect of Chimpi extract on cell migration. The components of Chimpi extract and fractions obtained by liquid–liquid distribution studies were added to HaCaT cells, and AQP3 expression was analyzed. Chimpi extract significantly increased AQP3 expression in HaCaT cells at both the mRNA and protein levels. Immunocytochemical staining revealed that Chimpi extract also promoted the transfer of AQP3 to the cell membrane. Furthermore, Chimpi extract enhanced cell migration. Hesperidin, narirutin, and nobiletin did not increase AQP3 levels. Although the components contained in the fractions obtained from the chloroform, butanol, and water layer increased AQP3, the active components could not be identified.
Conclusions
These results reveal that Chimpi extract may increase AQP3 levels in keratinocytes and increase the dermal water content. Therefore, Chimpi extract may be effective for the management of dry skin.
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Acknowledgements
This research was funded by the following grants; Grant-in Aid for Scientific Research (C) from the Japan Society for the Promotion of Science, grant number 22K11838. We would like to thank Tsumura and Co. for supply HPLC profile of Chimpi extract.
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Japan Society for the Promotion of Science, 22K11838, Nobutomo Ikarashi
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All authors contributed to the study conception and design. Data collection and analysis were performed by NI, MK, DW, YS, KT, RY, YN, and NW. The first draft of the manuscript was written by MK. The review and editing were performed by NI, RK, HS, JK, and TH. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Ikarashi, N., Kaneko, M., Wakana, D. et al. Effect of Chimpi, dried citrus peel, on aquaporin-3 expression in HaCaT human epidermal keratinocytes. Mol Biol Rep 49, 10175–10181 (2022). https://doi.org/10.1007/s11033-022-07892-2
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DOI: https://doi.org/10.1007/s11033-022-07892-2