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Erschienen in: Lasers in Medical Science 9/2022

06.09.2022 | Original Article

Low-level laser therapy with different irradiation methods modulated the response of bone marrow mesenchymal stem cells in vitro

verfasst von: Daiwei Si, Bo Su, Jingwei Zhang, Kui Zhao, JinMeng Li, DeChun Chen, ShiQi Hu, Xintao Wang

Erschienen in: Lasers in Medical Science | Ausgabe 9/2022

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Abstract

Low-level laser therapy (LLLT) also known as photobiomodulation is a treatment to change cellular biological activity. The exact effects of LLLT remain unclear due to the different irradiation protocols. The purpose of this study was to investigate the effects of LLLT by three different irradiation methods on the proliferation and osteogenic differentiation of bone marrow mesenchymal stem cells (BMSCs) in vitro. BMSCs were inoculated in 24-well plates and then irradiated or not (control) with a laser using three different irradiation methods. The irradiation methods were spot irradiation, covering irradiation, and scanning irradiation according to different spot areas (0.07 cm2 or 1.96 cm2) and irradiation areas (0.35 cm2 or 1.96 cm2), respectively. The laser was applied three times at energy densities of 4 J/cm2. The cell proliferation by CCK-8. ALP activity assay, alizarin red, and quantitative real-time polymerase chain reaction (RT-PCR) were performed to assess osteogenic differentiation and mineralization. Increases in cell proliferation was obvious following irradiation, especially for covering irradiation. The ALP activity was significantly increased in irradiated groups compared with non-irradiated control. The level of mineralization was obviously improved following irradiation, particularly for covering irradiation. RT-PCR detected significantly higher expression of ALP, OPN, OCN, and RUNX-2 in the group covering than in the others, and control is the lowest. The presented results indicate that the biostimulative effects of LLLT on BMSCs was influenced by t he irradiation method, and the covering irradiation is more favorable method to promote the proliferation and osteogenic differentiation of BMSCs.
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Metadaten
Titel
Low-level laser therapy with different irradiation methods modulated the response of bone marrow mesenchymal stem cells in vitro
verfasst von
Daiwei Si
Bo Su
Jingwei Zhang
Kui Zhao
JinMeng Li
DeChun Chen
ShiQi Hu
Xintao Wang
Publikationsdatum
06.09.2022
Verlag
Springer London
Erschienen in
Lasers in Medical Science / Ausgabe 9/2022
Print ISSN: 0268-8921
Elektronische ISSN: 1435-604X
DOI
https://doi.org/10.1007/s10103-022-03624-x

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