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首页> 外文期刊>Journal of Photochemistry and Photobiology, B. Biology: Official Journal of the European Society for Photobiology >Inhibitory effects of silk protein,sericin on UVB-induced acute damage and tumor promotion by reducing oxidative stress in the skin of hairless mouse
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Inhibitory effects of silk protein,sericin on UVB-induced acute damage and tumor promotion by reducing oxidative stress in the skin of hairless mouse

机译:蚕丝蛋白丝氨酸通过减少无毛小鼠皮肤中的氧化应激对UVB诱导的急性损伤和促进肿瘤的抑制作用

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摘要

This study was conducted to assess protective effect of an antioxidant protein,sericin,on UVB-induced acute damage and tumor promotion in mouse skin.In experiment 1,HR-1 hairless mice were treated with 180 mJ/cm~2 of ultraviolet B light (UVB) once daily for 1 and 7 days.The treatment for 7 days caused red sunburn lesions of the skin.The intensity of red color and area of these lesions were inhibited by the topical application of sericin at the dose of 5 mg after UVB treatment.Immunohistochemical analyses showed that the application of sericin significantly suppressed UVB-induced elevations in 4-hydroxynonenal (4-HNE),expression of cyclooxygenase-2 (COX-2) protein,and proliferating cell nuclear antigen (PCNA)-labeling index in the UVB-exposed epidermis.In experiment 2,HR-1 hairless mice were treated with 200 nmol of 7,12-dimethylbenz[alpha]anthracene (DMBA) followed 1 week later by irradiation with 180 mJ/cm~2 of UVB twice weekly for 22 weeks.The protective effect of serrcin was evident in terms of significant reduction in turmor incidence and tumor multiplicity at the dose of 5 mg.The results suggest that sericin possesses photoprotective effect against UVB-induced acute damage and tumor promotion by reducing oxidative stress,COX-2 and cell proliferation in mouse skin.
机译:本研究旨在评估抗氧化蛋白丝氨酸对小鼠皮肤紫外线B诱导的急性损伤和肿瘤促进的保护作用。实验1,用180 mJ / cm〜2的紫外线B光治疗HR-1无毛小鼠(UVB)每天一次,持续1天和7天,治疗7天导致皮肤出现红色晒伤斑,在UVB剂量为5 mg的局部施用丝胶后,会抑制红色强度和这些斑的面积免疫组织化学分析表明,丝胶蛋白的应用显着抑制了UVB诱导的4-羟基壬烯醛(4-HNE)升高,环氧合酶2(COX-2)蛋白的表达以及增殖细胞核抗原(PCNA)标记指数。在实验2中,用200nmol的7,12-二甲基苯并蒽(DMBA)处理HR-1无毛小鼠,随后1周后每周两次用180mJ / cm 2的UVB照射。持续22周.serrcin的保护作用明显结果表明,丝胶蛋白通过降低小鼠皮肤的氧化应激,COX-2和细胞增殖,可显着降低肿瘤发生率和5倍剂量的肿瘤多重性。结果表明,丝胶蛋白具有抗UVB诱导的急性损伤和促进肿瘤的光保护作用。

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