扇贝多肽抗紫外线A对无毛小鼠皮肤的氧化损伤

目的:探究扇贝多肽(PCF)抗紫外线UVA对无毛小鼠皮肤氧化损伤的作用.方法:昆明种无毛小鼠,随机分为双蒸水未照射组和模型组(双蒸水照射组、5％PCF组、20％PCF组、10％维生素 C组).酶法测定皮肤匀浆抗氧化酶(GSH-Px、T-AOC、SOD)活性和MDA的含量;免疫组织化学法测定皮肤Bc1-2和NOS蛋白表达;电镜观察皮肤组织超微结构.结果:PCF能明显增加皮肤组织匀浆总抗氧化能力及GSH-Px、SOD活性,降低MDA含量.免疫组化结果表明,PCF能上调Bcl-2蛋白的表达;抑制NOS蛋白的表达.超微结构显示20％PCF组表皮细胞结构正常,成纤维细胞的细胞器结构正常;模型对照组表皮细胞损伤,胞质内可见空泡形成,真皮成纤维细胞内可见囊泡状扩张的滑面内质网,粗面内质网等细胞器减少,PCF组与模型对照组比较各项指标均有改善(P<0.05).结论:扇贝多肽具有抗紫外线UVA对无毛小鼠皮肤氧化损伤的作用.其机制与扇贝多肽上调BCl-2蛋白表达,下调NOS蛋白的表达,提高抗氧化酶含量,抑制脂质过氧化有关.

Protective effect of polypeptide from Chlamys farreri on hairless mice damaged by ultraviolet A

AIM: To study the protective effect of the polypeptide isolated from Chlamys farreri (PCF) on hairless mice skin damaged by ultraviolet A. METHODS: Enzymes and malondialdehyde (MDA) were determined by biochemical methods; the expressions of Bcl-2 protein and NOS protein were examined by immunohistochemical technique. The ultra-structure of the skin was observed through electronic microscope. RESULTS: PCF could enhance the activities of glutathione peroxidase (GSH-px), superoxide dismutase (SOD), and total anti-oxidative capacity (T-AOC). Also PCF could reduce the amount of MDA, increase the expression of Bcl-2 protein, and inhibit the expression of NOS protein. The ultra-structure of epidermis and fibroblasts remained normal in 20 % PCF groups; there were vacuoles in smooth endoplasm reticulum in epidermis of mice and the number of rough endoplasm reticulum in fibroblasts was decreased in model group. CONCLUTION: PCF had the protective effects on hairless mice skin damaged by ultraviolet A via its anti-oxidative mechanisms.