IL-6 regulates stress-induced REX-1 expression via ATP-P2Y1 signalling in stem cells isolated from human exfoliated deciduous teeth |
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Authors: | Nattanan Govitvattana Thanaphum Osathanon Thasanporn Toemthong Prasit Pavasant |
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Institution: | 1. Research Unit of Mineralized Tissue, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand;2. Graduate Program in Oral Biology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand;3. Department of Anatomy, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand;4. Department of Mental Health, Ministry of Public Health, Bangkok, Thailand |
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Abstract: | ObjectiveTo investigate the relationship between ATP and IL-6 in mechanical stress-induced REX-1 expression in SHEDs.MethodsCells were stimulated with mechanical stress (0–2.5 g cm−2), IL-6 (0.1–5 ng/ml), or ATP (10–100 μM) for 2 h in serum-free media. IL-6 and REX-1 expression was examined by qualitative and quantitative polymerase chain reaction. ATP release was measured using a bioluminescence assay. The molecular mechanisms of the signalling pathways were investigated using chemical inhibitors.ResultsMechanical stress induced IL-6 and REX-1 mRNA expression and ATP release. JAK inhibitor I inhibited the increase in REX-1 expression and ATP release but not IL-6 induction. Furthermore, suramin inhibited the upregulation of REX-1 mRNA expression but not ATP release. Exogenous IL-6 promoted both ATP release and REX-1 expression. The IL-6-induced REX-1 expression was attenuated by a P2Y1-specific receptor antagonist. Moreover, REX-1 expression was upregulated in a dose-dependent manner by the addition of ATP or a P2Y1 agonist. This inductive effect was abolished by the P2Y1-specific receptor antagonist.ConclusionsATP-P2Y1 signalling is involved in IL-6-regulated stress-induced REX-1 expression in SHEDs. These results imply the participation of mechanical stress, IL-6, and ATP in regulating the expression of REX-1, a pluripotent stem cell marker. |
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Keywords: | ATP P2Y1 IL-6 Rex-1 SHEDs Stemness |
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