消可宁对高糖状态下大鼠肾小球系膜细胞增殖的调控效应

背景:中药对早期糖尿病肾病有较好的防治作用,这一作用是基于中药有效成分的多样性而作用于糖尿病肾病不同靶点所引起的。目的:观察消可宁对高糖培养的大鼠肾小球系膜细胞增生的影响,并探讨其可能的作用机制。设计:对照观察。单位:南京医科大学第一附属医院内分泌科。材料:实验于2003-07/2004-05在南京医科大学第一附属医院内分泌代谢研究中心细胞培养研究室完成。大鼠系膜细胞株HBZY-1:购自武汉大学中国典型培养物保藏中心。方法:系膜细胞按说明进行传代培养备用。①不同刺激浓度分组:高糖 消可宁组(消可宁分别取20.0,40.0,60.0,80.0,120.0,200.0g/L);正常糖对照组,细胞液中葡萄糖浓度为5.6mmol/L;高糖对照组,细胞液中葡萄糖浓度为30mmol/L,分别刺激72h进行观察。不同刺激时间分组:正常糖对照组,细胞液中葡萄糖浓度为5.6mmol/L;高糖对照组,细胞液中葡萄糖浓度为30mmol/L;高糖 消可宁组,细胞液中葡萄糖浓度为30mmol/L,消可宁浓度为60g/L;3组分别在刺激24,48,72h给予观察。②将配置好的细胞悬液放入96孔培养板,每孔加200μL。培养板放置体积分数为0.05CO2,37℃孵箱24h后,取出弃上清,加入各组含不同药物及浓度的细胞液,每孔200μL。将96孔板放入37℃含体积分数为0.05的CO2空气和100%湿度培养箱中孵育。不同刺激浓度组别于72h后分别向板孔中加20μL4-甲基偶氮四唑蓝(5g/L),不同刺激时间组别于24,48,72h后分别向板孔中加20μL4-甲基偶氮四唑蓝(5g/L),之后均在37℃培养箱中温育4h,置镜下观察4-甲基偶氮四唑蓝掺入细胞内,吸出上清,加入150μL二甲基亚砜使用甲醇溶解,用平板摇床摇匀振荡30s,于酶标仪492nm波长读数,并记录吸光度值。主要观察指标:不同培养时间及不同消可宁培养浓度下系膜细胞增殖情况(吸光度值)。结果:①不同刺激时间各组系膜细胞增殖的情况:(下转第201页)高糖对照组刺激24,48,72h系膜细胞吸光度值分别为0.685±0.010,0.750±0.087,0.659±0.018,高于正常糖对照组(0.586±0.054,0.598±0.040,0.527±0.047,P<0.05),高糖对照组及正常糖对照组葡萄糖刺激系膜细胞48h吸光度值高于24h(P<0.05),刺激72h吸光度值低于48h,(P<0.05)。高糖 消可宁组药物刺激72h后系膜细胞吸光度值为0.538±0.023,低于高糖对照组(P<0.05)。②不同浓度消可宁刺激系膜细胞增生情况:消可宁自浓度为60.0g/L起,可明显的阻止高糖对系膜细胞的过度刺激作用,并随着浓度的增加,这种作用逐渐增强,但过高的浓度(120.0g/L)则出现细胞脱落死亡,极高的药物浓度(200.0g/L)则不见存活的细胞。结论:高糖培养的系膜细胞在消可宁刺激72h后表现出较强的抑制系膜细胞增殖的作用,在一定范围内呈剂量依赖的方式,但过高的药物浓度又表现出很强的细胞毒性。

Effect of Xiaokening on adjusting the proliferation of mesangial cells in rats under high glucose

BACKGROUND: Chinese medicines have better effects on preventing and treating diabetic nephropathy at early period, and the effects are caused by the diversity of the effective components of Chinese medicines which acts on the different targets of diabetic nephropathy.OBJECTIVE: To observe the effect of Xiaokening on the proliferation of mesangial cells under high glucose, and investigate the possible mechanism. DESIGN: A controlled observation.SETTING: Department of Endocrinology, the First Affiliated Hospital of Nanjing Medical University.MATERIALS: The experiments were completed in the Research Room of Cell Culture, Research Center of Endocrine Metabolism, the First Affiliated Hospital of Nanjing Medical University from July 2003 to May 2004. The rat mesangial cell lines HBZY-1 were bought from Chinese Center for Typical Culture Collection.METHODS: The mesangial cells were passaged and cultured according to the instructions. ① Grouping according to different concentration of stimulation: In the high glucose+Xiaokening group, Xiaokening of 6 concentrations were used, I.e., 20.0, 40.0, 60.0, 80.0, 120.0, 200.0 g/L. Meanwhile,normal glucose control group and high glucose control group were also set,the glucose concentration in the medium was 5.6 and 30 mmol/L respectively. The proliferations were observed after 72 hours. Grouping according to different time points of stimulation: There were normal glucose control group, high glucose control group and high glucose+Xiaokening group, the glucose concentration in the medium was 5.6, 30 and 30 mmol/L respectively, and the Xiaokening concentration was 60 g/L. The proliferations were observed at 24, 48 and 72 hours respectively in the three groups.② The dispensed cell suspension was placed into the 96-well plate, and 200 μL suspension for each well. The culture plate was placed in the inoculation box containing CO2 (0.05 in volume fraction) at 37 ℃ for 24 hours, then the supernatant was deserted, cell solutions containing different drugs of different concentrations were added in each group, 200 μL for each well. The 96-well plate was then placed in the culture box containing CO2 (0.05 in volume fraction) and 100% humidity at 37 ℃ for inoculation.In the groups of different concentrations, 20 μL MTT (5 g/L) was added into the wells after 72 hours. In the groups of different time points, 20 μL MTT (5 g/L) was added into the wells at 24, 48 and 72 hours. Then the plates were inoculated at 37 ℃ for 4 hours. Under microscope, it was observed that MTT get into the cells, the supernatant was sucked away, then 150 μL dimathyl sulfoxide was added to dissolve methyl alcohol, and shaken to even with plate rocking bed for 30 s, and the absorbance (A) values were recorded with the microplate reader at the wavelength of 492 nm.MAIN OUTCOME MEASURES: The proliferations of mesangial cells (A value) were observed at different time points and in Xiaokening of different concentrations.RESULTS: ①Proliferation of mesangial cells at different time points: The A values in the high glucose control group at 24, 48 and 72 hours (0.685 ±0.010, 0.750±0.087, 0.659±0.018) were higher than those in the normal glucose control group (0.586±0.054, 0.598±0.040, 0.527±0.047, P ＜ 0.05). In both the high and normal glucose control groups, the A value at 48 hours was higher than that at 24 hours (P ＜ 0.05), but the A value at 72 hours was lower than that at 48 hours (P ＜ 0.05). The A value in the high glucose+Xiaokening group at 72 hours was 0.538±0.023, and it was lower than that in the high glucose control group (P ＜ 0.05). ② Proliferation of mesangial cells in Xiaokening of different concentrations: Xiaokening high er than 60.0 g/L could obviously restrain the excessive stimulation of high glucose to the mesangial cells, and the effect was in a concentration-de pendent manner, but too high concentration (120.0 g/L) would result in the abscission and death of cells, whereas no survived cells could be observed in extremely high concentration (200.0 g/L). CONCLUSION: Xiaokening could inhibit the proliferation of mesan gial cells stimulated by high glucose after 72 hours in a concentration dependent manner, but too high concentration would cause strong cytotoxicity.