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黃芹苷於皮膚角質細胞(HaCat cell)對中波紫外線之輻射保護作用

Radioprotective Effects of Baicalin after UVB Exposure in HaCat Cells

摘要


黃芩苷是類黃酮的化合物,來自中醫草藥中黃芩主要的成份,具有藥物活性、抗氧化、抗菌、抗細胞凋亡、抗發炎等特徵,研究發現在長波紫外線暴露後黃芩苷可減少過氧化物、氮氧化物及活性氧物種(reactive oxygen species)的產生。本研究旨在探討黃芩苷對於中波紫外線(UVB)暴露後於人類皮膚角 質細胞(HaCat cell)之細胞殘留分率及釐清黃芩苷對此合併處理之作用機制。黃芩苷合併處理(100 μg/ml)的細胞存活率比單獨輻射組增加27%;黃芩苷合併處理(50 μg/ml)的細胞存活率比單獨輻射組增加16%。細胞週期分析UVB 與黃芩苷(50、100 μg/ml)合併處理比較,黃芩苷合併處理與輻射單獨處理相比,其在sub-G1期比率依序減少52%、40%。在西方點墨法實驗中,加入黃芩苷處理後與單獨UVB相比可以減 少細胞蛋白酶-3與增加MCL-1之活性。結論顯示黃芩苷具有輻射保護作用,明確可以降低經由中波紫外線照射後的細胞死亡率及細胞凋亡率。

並列摘要


Baicalin is a flavonid glycoside isolated from Scutellaria baicalensis. The flavones have the multiple potentials in exerting antioxidant, anti-bacterial, anti-apoptotic, anti-inflammatory. In previous studies, baicalin were reported with radioprotection mediating by decreases of reactive oxygen species (ROS), super-oxide anion (O_2 ^-), and nitogen oxide (NO) on photodamage after ultraviolet A (UVA) radiation. The aims of this study were to analyze survival fractions and to investigate the mechanisms of baicalin and ultraviolet B (UVB) in HaCat cell. In combined groups of baicalin (100, 50 μg/ml) and UVB, cell viabilities were increased 27% and 16% than UVB alone. The cells of sub-G1 stage of combined groups with baicalin of 100 and 50 μg/ml were reduced 52% and 40% than UVB alone, respectively. In the western blot, the combined groups decreased the expression of caspase-3 and increased the MCL-1 expression than UVB alone. The baicalin pretreatment has radioprotective effects, it apparently reduces cell death and apoptosis rate in the human keratinocyte cell after UVB exposure.

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