肾阳虚证患者红细胞LPO、SOD和ATP酶活性的变化

目的 :探讨肾阳虚证患者红细胞LPO、SOD和ATP酶活性的特点及其意义。方法 :观察 19例肾阳虚证患者和 2 1例正常人红细胞LPO、SOD和红细胞膜Na+ K+ ATP酶、Mg2 + ATP酶、Ca2 + ATP酶、Ca2 + Mg2 + ATP酶活性的变化。结果 :与对照组比较 ,肾阳虚证患者红细胞LPO含量升高 (P <0 .0 1) ,红细胞SOD活性降低 (P <0 .0 1) ;红细胞膜Na+ K+ ATP酶活性显著升高 (P <0 .0 1) ,而Mg2 + ATP酶活性变化无显著性差异 ,Ca2 + ATP酶活性升高 (P <0 .0 1) ,Ca2 + Mg2 + ATP酶活性也显著升高 (P <0 .0 1)。结论 :肾阳虚证患者红细胞内脂质过氧化反应增强 ,而抗氧化能力降低 ,红细胞膜Na+ K+ ATP酶、Ca2 + ATP酶和Ca2 + Mg2 + ATP酶活性升高 ;本研究为理解肾阳虚证的病理生理基础提供了初步实验依据     

针灸对环磷酰胺化疗小鼠脂质过氧化损伤的影响

环磷酰胺（ＣＴＸ）能损伤机体抗氧化系统，引发脂质过氧化损伤。实验对照组血清、肝组织ＳＯＤ活力分别为：２０５．０８±４６．７０，１３０．７７±４１．６９，与正常对照组（２９９．５８±３８．７５，３８３．６９±５１．７６）差别均有非常显著性意义（Ｐ＜０．０１），而其肝组织ＭＤＡ含量又明显高于正常对照组（Ｐ＜０．０１）。针灸能较好地保护机体的抗氧化系统，提高ＳＯＤ活力，减少脂质代谢产物在体内的堆积，减轻环磷酰胺对机体的毒副作用。各针灸组ＳＯＤ活力均不同程度地高于实验对照组。而其ＭＤＡ含量又明显低于实验对照组。针灸的效应与所选用的腧穴、刺激量、刺激方法有关。以足三里穴好于大椎、命门；针刺好于艾灸；针灸５分钟好于１０分钟。     

针刺对烧伤创面组织LPO、SOD的影响

目的:探讨针刺促进烧伤创面愈合的机理.方法:建立兔深Ⅱ度烧伤动物模型,电针双侧"足三里"穴,同时取正常组织对照.动态观察烧伤后早期创面组织中脂质过氧化物(LPO)和超氧化物歧化酶(SOD)的变化以及针刺"足三里"穴后对创面组织中LPO、SOD的影响.结果:烧伤创面组织早期SOD的活性下降,LPO升高.针刺后可提高烧伤后早期组织抗过氧化能力.结论:针刺可促进烧伤创面愈合,其机理可能是针刺可提高烧伤组织抗过氧化能力所致.     

Ion release from a composite resin after exposure to different 10% carbamide peroxide bleaching agents

Objective

This in vitro study evaluated the influence of two 10% carbamide peroxide bleaching agents - a commercial product (Opalescence PF; Ultradent Products, Inc.) and a bleaching agent prepared in a compounding pharmacy - on the chemical degradation of a light-activated composite resin by determining its release of ions before and after exposure to the agents.

Material and Methods

Thirty composite resin (Filtek Z250; 3M/ESPE) samples were divided into three groups: group I (exposed to Opalescence PF commercial bleaching agent), group II (exposed to a compounded bleaching agent) and group III (control - Milli-Q water). After 14 days of exposure, with a protocol of 8 h of daily exposure to the bleaching agents and 16 h of immersion in Milli-Q water, the analysis of ion release was carried out using a HP 8453 spectrophotometer. The values were analyzed statistically by ANOVA, Tukey''s test and the paired t-tests. The significance level was set at 5%.

Results

After 14 days of the experiment, statistically significant difference was found between group II and groups I and III, with greater ion release from the composite resin in group II.

Conclusions

The compounded bleaching agent had a more aggressive effect on the composite resin after 14 days of exposure than the commercial product and the control (no bleaching).     

珍珠口服液对自由基及果蝇寿命的影响

研究珍珠口服液对动物SOD、LPO、耐缺氧和果蝇寿命的影响结果表明，珍珠口服液可使大鼠RBC内SOD活性明显升高．小鼠血清中LPO含量降低，提高小鼠耐缺氧能力，显著延长果蝇的平均寿命及最高寿命．     

丙泊酚对儿童红细胞抗氧化酶系统的影响

目的观察不同浓度丙泊酚对儿童红细胞抗氧化损伤的保护作用。方法采集20例健康儿童动脉血制成压积红细胞．分为五种不同浓度丙泊酚组（12．5、25、50、75、100μmol／L）（Ⅰ～Ⅴ组）、单纯过氧化氢损伤组（Ⅵ组）和空白对照组（Ⅶ组）．孵育后测各组谷胱甘肽还原酶（GR）活力、谷胱甘肽（GSH）含量。结果Ⅵ组GR活力、GSH含量显著降低,丙泊酚浓度〈50μmol／L时,GSH含量、GR活性Ⅱ、Ⅲ、Ⅳ、Ⅴ组与Ⅵ组及Ⅶ组相比显著增加;当丙泊酚浓度〉50μmol／L时,GSH含量、GR活性皆呈下降趋势。结论一定浓度的丙泊酚可增强儿童红细胞谷胱甘肽抗氧化酶系统活性。     

The effectiveness of chemical denture cleansers and ultrasonic device in biofilm removal from complete dentures

Adequate denture hygiene can prevent and treat infection in edentulous patients. They are usually elderly and have difficulty for brushing their teeth.

Objective

This study evaluated the efficacy of complete denture biofilm removal using chemical (alkaline peroxide-effervescent tablets), mechanical (ultrasonic) and combined (association of the effervescent and ultrasonic) methods.

Material and Methods

Eighty complete denture wearers participated in the experiment for 21 days. They were distributed into 4 groups (n=20): (1) Brushing with water (Control); (2) Effervescent tablets (Corega Tabs); (3) Ultrasonic device (Ultrasonic Cleaner, model 2840 D); (4) Association of effervescent tablets and ultrasonic device. All groups brushed their dentures with a specific brush (Bitufo) and water, 3 times a day, before applying their treatments. Denture biofilm was collected at baseline and after 21 days. To quantify the biofilm, the internal surfaces of the maxillary complete dentures were stained and photographed at 45º. The photographs were processed and the areas (total internal surface stained with biofilm) quantified (Image Tool 2.02). The percentage of the biofilm was calculated by the ratio between the biofilm area multiplied by 100 and the total area of the internal surface of the maxillary complete denture.

Results

The Kruskal-Wallis test was used for comparison among groups followed by the Dunn multiple-comparison test. All tests were performed respecting a significance level of 0.05. Significant difference was found among the treatments (KW=21.18; P<0.001), the mean ranks for the treatments and results for Dunn multiple comparison test were: Control (60.9); Chemical (37.2); Mechanical (35.2) and Combined (29.1).

Conclusion

The experimental methods were equally effective regarding the ability to remove biofilm and were superior to the control method (brushing with water). Immersion in alkaline peroxide and ultrasonic vibration can be used as auxiliary agents for cleaning complete dentures.     

Serum lipid peroxides and total antioxidant status in postmenopausal women on hormone replacement therapy

Estradiol (E₂) has antioxidant properties. The role of progestins in antioxidant defense is still unknown. We have evaluated the influence of E₂ and E₂ plus medroxyprogesterone acetate (MPA) on serum lipid peroxide (LPO) levels, a marker of free radical reactions, and serum total antioxidant status (TAS) in postmenopausal women. Subjects consisted of 26 women with surgical menopause, before and after 4 months of estrogen replacement therapy (ERT; E₂), and 54 women with natural menopause on hormone replacement therapy (HRT; E₂ plus MPA). Forty premenopausal women served as a control group. Serum E₂ was estimated by radioimmunoassay, follicle-stimulating hormone by IRMA methods, LPO and TAS by colorimetric methods. Before therapy, LPO levels in the postmenopausal women were significantly higher (p?<?0.001) than in the control group. After both ERT and HRT, LPO decreased significantly and did not differ between both groups and the control group. TAS was significantly lower in postmenopausal women (p?<?0.001) than in the control group before therapy. After both ERT and HRT, TAS increased significantly and did not differ between both groups and the control group. We conclude that oxidative stress is increased after menopause. ERT and HRT inhibit the generation of free radicals and raise antioxidant potential to the levels found in premenopausal women. MPA did not influence the antioxidant action of E₂.     

乙肝Ⅱ号治疗慢性乙型病毒肝炎时的抗氧自由基作用

目的：研究乙肝Ⅱ号治疗慢性乙型肝炎时的抗氧自由基作用及其机制。方法：采用乙肝Ⅱ号治疗慢性乙型肝炎40例。观察患者血清过氧化脂质（LPO）含量、超氧化物歧化酶（SOD）及谷胱甘肽过氧化物酶（GSH－P x）活力以及丙氨酸转氨酶（ALT）的变化。结果：乙肝Ⅱ号治疗组,治疗后LPO含量下降,SOD、GSH－Px活力上升,ALT、AST明显降低,数据显示：ALT、AST与SOD、TSH－Px呈负相关,与LPO呈正相关。结论：乙肝Ⅱ号对慢性乙型肝炎患者具有恢复肝功能、抗 氧自由基的作用。     

家兔缺血与再灌流肾内脂质过氧化物含量的变化

本研究发现:家兔缺血60min(未再灌流)肾皮质和髓质内,脂质过氧化物含量均显著降低;缺血60min再灌流15min的肾皮质和髓质内,脂质过氧化物含量均显著增加。实验提示:缺血再灌流贤内氧自由基“爆发性”生成所引发的脂质过氧化可能是肾缺血性损伤的重要机制之一。