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Original Article | Open Access

IFT140+/K14+ cells function as stem/progenitor cells in salivary glands

Xueming Zhang1 , Ji Zhou2, Xinyu Wang2, Jiangyu Geng2, Yubei Chen2, Yao Sun2 ( )
Department of Oral and Maxillofacial Surgery, Stomatological Hospital and Dental School of Tongji University, Shanghai Engineering Research Center of Tooth Restoration and Regeneration, No. 399, YanChang Middle Road, Shanghai, China
Department of Implantology, Stomatological Hospital and Dental School of Tongji University, Shanghai Engineering Research Center of Tooth Restoration and Regeneration, No. 399, YanChang Middle Road, Shanghai, China

These authors contributed equally: Xueming Zhang, Ji Zhou

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Abstract

Stem/progenitor cells are important for salivary gland development, homeostasis maintenance, and regeneration following injury. Keratin-14+ (K14+) cells have been recognized as bona fide salivary gland stem/progenitor cells. However, K14 is also expressed in terminally differentiated myoepithelial cells; therefore, more accurate molecular markers for identifying salivary stem/progenitor cells are required. The intraflagellar transport (IFT) protein IFT140 is a core component of the IFT system that functions in signaling transduction through the primary cilia. It is reportedly expressed in mesenchymal stem cells and plays a role in bone formation. In this study, we demonstrated that IFT140 was intensively expressed in K14+ stem/progenitor cells during the developmental period and early regeneration stage following ligation-induced injuries in murine submandibular glands. In addition, we demonstrated that IFT140+/K14+ could self-renew and differentiate into granular duct cells at the developmental stage in vivo. The conditional deletion of Ift140 from K14+ cells caused abnormal epithelial structure and function during salivary gland development and inhibited regeneration. IFT140 partly coordinated the function of K14+ stem/progenitor cells by modulating ciliary membrane trafficking. Our investigation identified a combined marker, IFT140+/K14+, for salivary gland stem/progenitor cells and elucidated the essential role of IFT140 and cilia in regulating salivary stem/progenitor cell differentiation and gland regeneration.

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International Journal of Oral Science
Volume 14,
2022
Article number: 49
DOI: 10.1038/s41368-022-00200-5

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Cite this article:
Zhang X, Zhou J, Wang X, et al. IFT140+/K14+ cells function as stem/progenitor cells in salivary glands. International Journal of Oral Science, 2022, 14: 49. https://doi.org/10.1038/s41368-022-00200-5

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Accepted: 05 September 2022
Published: 10 October 2022
© The Author(s) 2022

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