扇贝多肽保护Hela细胞免受紫外线UVA氧化损伤

目的:建立紫外线UVA(辐照强度为3650μJ·cm~(-2)对Hela细胞氧化损伤模型.探究扇贝多肽(PCF)对Hela细胞紫外线UVA氧化损伤的保护作用.方法:MTT法测定细胞活性;酶法测定抗氧化酶(GSH-Px、CAT、SOD)活性;流式细胞仪AnnexinV法测定细胞的凋亡率和死亡率;Fluo-3 AM为荧光染料,流式细胞仪测定细胞内游离Ca~(2 )的含量.结果:PCF(0.5％-2％)能明显增加 Hela细胞的增殖活性和细胞内游离Ca~(2 )的浓度.显著提高Hela细胞GSH-Px、CAT、SOD活性,且呈量效关系.同时降低Hela细胞的凋亡率和死亡率.PCF组与模型对照组比较各项指标均有统计学意义(P< 0.0 5,P<0.01).结论:扇贝多肽具有抗紫外线UVA对Hela细胞氧化损伤的作用.其机制与扇贝多肽提高抗氧化酶含量,抑制脂质过氧化有关.

Protective effects of polypeptide from Chlamys farreri on Hela cells damaged by ultraviolet A

AIM: To study the protective effect of polypeptide isolated from Chlamys farreri (PCF) on Hela cells damaged by ultraviolet A (UVA) in vitro. METHODS: Cell proliferation was determined by MTT method; intra-cellular free calcium Ca2 ]i and rates of apoptosis and death were measured by flow cytometry (FCM). RESULTS: PCF (0.5 %-2 %) enhanced the activities of glutathione peroxidase (GSH-px), superoxide dismutase (SOD), and catalase (CAT), and stimulated cell proliferation. The concentration of Ca2 ]i was increased while the amounts of MDA and the rates of apoptosis and death of the cells were decreased. The differences between the PCF groups and control group were significant (P<0.05, P<0.01). CONCLUSION: PCF protected Hela cells against damage by UVA via its anti-oxidative mechanisms.