海洋胶原肽抗皮肤老化作用的实验研究

目的 探讨海洋胶原肽抗皮肤衰老的作用及机制.方法 清洁级SD大鼠,每日腹腔注射D-半乳糖(0.125 g/kg)建立皮肤衰老模型,同时灌胃给予海洋胶原肽(0.225、0.450、1.350g/kg),连续进行90 d后,测定大鼠血清中超氧化物歧化酶(SOD)、过氧化氢酶(CAT)活性及丙二醛(MDA)含量,并观察皮肤组织形态学改变.结果 海洋胶原肽干预后,动物皮肤表皮变厚,真皮层中成纤维细胞增多且活跃,3个海洋胶原肽干预组血清中抗氧化酶SOD的活性分别为(455.52±11.39)U/ml、(460.15±18.09)U/ml、(468.59±27.25)U/ml,明显高于模型对照组SOD的活性(395.56±15.25)U/ml;0.225 g/kg和1.35 g/kg海洋胶原肽干预后大鼠血清中CAT的活性分别为(21.33±4.82)U/ml和(21.69±1.68)U/ml,与模型对照组CAT活性(17.14±2.81)U/ml相比明显升高,0.450 g/kg和1.350 g/kg海洋胶原肽干预后大鼠血清中脂质过氧化产物MDA含量分别(5.67±0.93)nmol/ml、(5.76±1.02)nmol/ml,与模型对照组(7.63±1.37)nmol/ml相比显著性降低.结论 海洋胶原肽可通过提高机体抗氧化活性,从而有效延缓D-半乳糖所致的皮肤衰老.

Effects of marine collagen peptide on delaying the skin aging

OBJECTIVE: To investigate the protective effect of marine collagen peptides (MCPs) on the skin of aged mice induced by D-galactose. METHODS: Subchronic toxicity study was conducted while D-galactose induced subacute aging model was established. D-galactose dose of 0.125 g/kg body weight was intraperitoneally injected daily for 90 days. Marine collagen peptide 0.225, 0.450, 1.350 g/kg body weight were administered by oral gavage. Superoxide dismutase (SOD), catalase (CAT) activity and malondiadehyde (MDA) content in blood serum were measured, along with cutaneous histopathology examination. RESULTS: Epidermal thickness was significantly higher in MCPs treated group. Number and activity of fibroblast in MCPs treated dermis was increased prominently. The activity of SOD in 0.225, 0.450, 1.350 g/kgbw MCPs treated groups were 455.52 +/- 11.39, 460.15 +/- 18.09, 468.59 +/- 27.25 U/ml respectively, each of which was significantly higher than that in model control group; the activity of serum CAT in 0.225, 1.350 g/kgbw MCPs treated groups (21.33 +/- 4.82, 21.69 +/- 1.68 U/ml) were obviously increased compared with that in model control group (17.14 +/- 2.81 U/ml); MDA level in 0.450, 1.350 g/kgbw MCPs treated groups were 5.67 +/- 0.93, 5.76 +/- 1.02 nmol/ml respectively, each of which was significantly lower than that in model control group (7.63 +/- 1.37 nmol/ml). CONCLUSIONS: The results showed that MCPs might play a protective role on skin aging by improving the activity of antioxidant.