Abstract
This Querystudy aimed to investigate the effects of low-energy red light-emitting diode (LED) irradiation on the proliferation of stem cells from apical papilla (SCAPs) and preliminarily elucidated the underlying molecular mechanisms. SCAPs were isolated and identified in vitro. The light source was a 10 W red LED with continuous output and a wavelength of 600–700 nm. SCAPs were irradiated with 0 (control group), 0.5 J/cm2, 1 J/cm2, 3 J/cm2, or 5 J/cm2. Cell Counting Kit-8 (CCK-8) assays were used to analyze cell proliferation rates and determine the most effective concentration of extracellular signal-regulated kinase 5 (ERK5) blocker, BIX02189. A real-time polymerase chain reaction (RT-PCR) was carried out to determine the involvement of the ERK5 signalling pathway and proliferation-associated genes (C-Jun, Jun B, and Cyclin D1). 5-Ethynyl-2′-deoxyuridine (EDU) was used to analyze cell cycle kinetic parameters. CCK-8 assay results suggested that SCAPs in red LED groups exhibited a higher proliferation rate than those in the control group, and 10 μmol/L BIX02189 was the most effective blocker. The RT-PCR results demonstrate that red LEDs upregulated the expression of the ERK5, C-Jun, Jun B, and Cyclin D1 genes, and BIX02189 successfully blocked the ERK5 signalling pathway. The results of EdU staining indicated that red LED promoted DNA synthesis activity and that BIX02189 suppressed cells into S phase. Red LEDs irradiation enhances the proliferation of SCAPs via the ERK5 signalling pathway by upregulating the expression of C-Jun, Jun B, and Cyclin D1.
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This work was supported by the Luzhou Municipal People’s Government-Southwest Medical University science and technology strategic cooperation projects of China (no. 2017LZXNYDT03). The reagents of this study were supported by this fund that came from Southwest Medical University.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Chunxia Shu and Lan Hou. The first draft of the manuscript was written by Chunxia Shu and Lan Hou, and the authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Shu, C., Hou, L., Chen, Q. et al. Irradiation with a red light-emitting diode enhances the proliferation of stem cells of apical papilla via the ERK5 signalling pathway. Lasers Med Sci 37, 2259–2268 (2022). https://doi.org/10.1007/s10103-021-03492-x
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DOI: https://doi.org/10.1007/s10103-021-03492-x