大黄素次酸对皮肤黑素细胞一氧化氮合酶的调控作用及意义(英文)  

Significance and effects of emodin hypo-acid on regulating nitricoxide synthase of melanocyte in skin

作　　者：钟桂书[1] 程基焱[2] 李燎[1] 陈德宇[1] 

机构地区：[1]泸州医学院附属医院皮肤科,四川省泸州市646000 [2]泸州医学院组织学与胚胎学教研室,四川省泸州市646000

出　　处：《中国临床康复》2006年第19期187-189,共3页Chinese Journal of Clinical Rehabilitation

摘　　要：背景:在影响黑素细胞功能的诸多信号介导途径中,一氧化氮被认为是一种极为重要的信号分子。大黄有效成分大黄素次酸可以影响黑素细胞的增殖及调节细胞中酪氨酸酶的活性。目的:观察大黄有效成分大黄素次酸对豚鼠皮肤黑素细胞的一氧化氮合酶表达的影响,以期确定大黄在活体皮肤中对黑素细胞的黑素合成的有效作用浓度和作用机制。设计:完全随机分组设计,对照实验。单位:泸州医学院附属医院皮肤科。材料:实验于2004-01/06在泸州医学院附属医院传染科实验室和泸州医学院组织学与胚胎学实验室完成。选用成年健康雄性封闭群豚鼠24只。随机将豚鼠分为6组:对照组,大黄素次酸2,5,10,20,40mg/L组,每组4只。方法:①将大黄素次酸用二甲基亚砜溶解稀释为2,5,10,20,40mg/L,分别对大黄素次酸(中国生物医学制品检定所提供,该药品为实验室提取的白色粉末纯品)2,5,10,20,40mg/L组豚鼠臀部、背部两处局部皮肤进行相应质量浓度皮下注射处理,注射量均为1mL。24h后对其中一处皮肤加注1mL相同浓度大黄素次酸一次。48h后取材,常规石蜡切片(取对照组及大黄素次酸组未注射药物处皮肤作实验对照组)。②免疫组织化学方法法显示一氧化氮合酶的表达,用光学显微镜在高倍镜下观察,识别黑素细胞,观察细胞胞质的染色及特点。用MLAS-1000图像分析仪,每组随机选择5张切片,每张切片检测20个细胞,由计算机处理系统计算出各组黑素细胞胞质中阳性免疫产物的平均吸光度(A值)。③计量资料差异比较采用方差分析,并且用SNK-q进行组间比较。主要观察指标:免疫组织化学方法显示黑素细胞内一氧化氮合酶的表达,用光学显微镜和图像分析仪获得实验结果。结果:黑素细胞胞质中阳性免疫产物的平均A值:大黄素次酸2,5,10,20,40mg/L组明显低于实验对照组(0.126±0.118,0.103±0.082,0.118±0.097,0.1BACKGROUND： Among multiple signals which affect the function of melanocyte, nitrogen monoxide （NO） has been thought as an important signal molecule. Emodin hypo-acid, effective component of rhubarb, can affect proliferation of melanocyte and regulate activity of tyrosinase in cells. OBJECTIVE： To study the effect of emodin hypo-acid on expression of nitricoxide synthase （NOS） of melanoeyte in skin of guinea pig and definite the effective concentrations and mechanism of melanocyte in synthesizing melanin in living skin. DESIGN： Completely randomized grouping design and controlled study. SETTING： Department of Dermatology, Affiliated Hospital of Luzhou Medical College. MATERIALS： The experiment was completed at the Infection laboratory of Affiliated Hospital of Luzhou Medical College and Laboratory of Histology and Embryology of Luzhou Medical College from January to June 2004. A total of 24 adult healthy male guinea pigs were randomly divided into 6 groups： control group, 2, 5, 10, 20 and 40 mg/L emodin hypo-acid groups with 4 in each group. METHODS： ① Emodin hypo-acid was diluted with dimethyl-sulfoxide into 2, 5, 10, 20 and 40 mg/L, then guinea pigs in emodin hypo-acid groups were injected subcutaneously with relevant dosages of emodin hypoacid which was provided by National Institute for the Control of Pharmaceutical and Biological Products into local skins of haunch and back, and the injected volume was 1 mL. Twenty-four hours later, 1 mL emodin hypo-acid of the same concentration was injected once again into one of the places which was injected before. Skin samples were selected after 48 hours and routine paraffin section was made. Skins which were not injected with any drugs were selected from control group and emodin hypoacid groups to regard as experimental control group. ② Expression of NOS was assayed with immunohistochemical method and melanocyte was identified under high-times optic microscope to observe stain and characteristic of cytoplasm. Five sections were randoml

关 键 词：黑素细胞/药物作用 一氧化氯合酶 大黄酸 

分 类 号：R758.3[医药卫生—皮肤病学与性病学]