Er:YAG laser irradiation decreases Sost expressions in bone and osteogenic cell (6h after surgery)
Ontology highlight
ABSTRACT: The purpose of this study was to evaluate comprehensive and sequential gene expressions in Er;YAG laser ablated bone, bur-drilled bone, and non-treated control bone to clarify the biological responses for bone healing.
Project description:The purpose of this study was to evaluate comprehensive and sequential gene expressions in Er;YAG laser ablated bone, bur-drilled bone, and non-treated control bone to clarify the biological responses for bone healing.
Project description:The purpose of this study was to evaluate comprehensive and sequential gene expressions in Er;YAG laser ablated bone, bur-drilled bone, and non-treated control bone to clarify the biological responses for bone healing.
Project description:A number of reports showed that photo-bio-modulation by various lasers has favorable biological effects on cells. However, the effects of low-level Er:YAG laser irradiation on osteoblasts remain unclear. The purpose of this study was to evaluate the effects on proliferation and osteogenic differentiation of primary osteoblast-like cells by low-level Er:YAG laser irradiation. Osteoblast-like cells isolated from the calvariae of 3–5-day-old Wistar rats were irradiated by Er:YAG laser at energy fluences of 2.2, 3.3, or 4.3 J/cm2, respectively. After irradiation, cell surface temperature was measured and cell proliferation was evaluated by flow cytometry. Calcification was evaluated by measuring the Alizarin red S staining area after 7-day-culture with osteoinductive medium. Gene expressions in non-irradiated and laser-irradiated cells were evaluated by qPCR at 3, 6, and 12 hours after irradiation. Microarray analysis was performed to comprehensively evaluate gene expressions of non-irradiated cells and irradiated cells at 3.3 J/cm2 at 6 hours after irradiation. No pronounced increase of cell surface temperature was induced by low-level Er:YAG laser irradiation, and the Er:YAG laser irradiation did not affect osteoblast-like cell proliferation. Osteoblast-like cell calcification was significantly increased 7 days after Er:YAG laser irradiation at 3.3 J/cm2. Bglap expression was significantly increased in cells irradiated at 3.3 J/cm2 at 6 hours post-irradiation. Microarray analysis showed that irradiation at 3.3 J/cm2 caused up-regulation of inflammation-related genes and down-regulation of Wisp2. Gene set enrichment analysis also clarified enrichment of inflammation-related gene sets and Notch signaling pathway. In conclusion, Low-level Er:YAG laser irradiation enhanced calcification of primary osteoblast-like cells via enhanced Bglap expression and enriched Notch signaling pathway.
Project description:This study aimed to explore the effects of low-level Er:YAG laser irradiation on the proliferation of gingival fibroblasts without the photothermal effect.
Project description:This study aimed to investigate the molecular effects of non-ablative Er:YAG laser treatment using an in vitro model of the non-keratinized mucous membrane and to compare its molecular effects with other ablative and non-ablative laser systems. In dermatology, the use of non-ablative and ablative fractional lasers has become the gold standard treatment for a number of indications. Each of the individual laser types is advantageous for different types of indications due to its respective properties, but new technologies open up new fields of application for individual laser systems. Performing a comprehensive gene expression profiling we compared the gene regulatory effects of non-ablative Er:YAG laser with other non-ablative and ablative laser systems. In vitro 3D models have proven to be a reliable and reproducible tool to study the molecular biological effects of different laser settings.