Int J Biol Sci 2019; 15(10):2087-2099. doi:10.7150/ijbs.27231

Research Paper

Ciliary IFT80 regulates dental pulp stem cells differentiation by FGF/FGFR1 and Hh/BMP2 signaling

Xue Yuan1, Min Liu2, Xu Cao3, Shuying Yang1,2✉

1. Department of Oral Biology, School of Dental Medicine, University of Buffalo, State University of New York, Buffalo, NY, United States
2. Department of Anatomy & Cell Biology, School of Dental Medicine, University of Pennsylvania, PA, United States
3. Department of Orthopedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States

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Citation:
Yuan X, Liu M, Cao X, Yang S. Ciliary IFT80 regulates dental pulp stem cells differentiation by FGF/FGFR1 and Hh/BMP2 signaling. Int J Biol Sci 2019; 15(10):2087-2099. doi:10.7150/ijbs.27231. Available from http://www.ijbs.com/v15p2087.htm

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Abstract

Primary cilia and intraflagellar transport (IFT) proteins control a wide variety of processes during development and tissue homeostasis. However, their potential roles in the regulation of stem cell differentiation and tooth development remain elusive. Here, we uncovered the critical roles of ciliary IFT80 in cilia formation and differentiation of dental pulp stem cells (DPSCs). IFT80-deficient DPSCs showed reduced fibroblast growth factor receptor 1 (FGFR1) expression, leading to the disruption of FGF2-FGFR1 signaling. We found, during DPSC differentiation, FGF2-FGFR1 signaling induces stress fiber rearrangement to promote cilia elongation, meanwhile stimulates PI3K-AKT signaling to aid Hh/bone morphogenetic protein 2 (BMP2) signaling activation. These signaling pathways and their coupling were disrupted in IFT80-deficient DPSCs, causing impaired differentiation. Our findings revealed a novel mechanism that ciliary protein regulates the odontogenic differentiation of DPSCs through FGF/FGFR1 and Hh/BMP2 signaling.

Keywords: Primary cilia, intraflagellar transport, dental pulp stem cells, fibroblast growth factor signaling, hedgehog signaling, bone morphogenetic protein