Vitamin C Inhibits Benzo[a]pyrene-Induced Cell Cycle Changes Partly via Cyclin D1/E2F Pathway in Human Embryo Lung Fibroblasts

INTRODUCTION Polycyclic aromatic hydrocarbons (PAHs) such as B[a]P are widespread environmental contaminants formed as byproducts of combustion[1]. PAHs have been found to be potent mammary carcinogens in rodents[2-3]. It is believed that B[a]P requires biological activation through oxidative metabolism to be carcinogenic. The ultimate carcinogenic metabolite has been considered to be the cytochrome P450 isozyme- and microsomal epoxide hydrolase- derived metabolite, BPDE, which forms…     

理血饮加减治疗紫癜性肾炎血尿40例疗效观察

目的:观察理血汤加减治疗紫癜性肾炎(HSPN)的临床疗效及作用机制。方法:将80例紫癜性肾炎血尿患者随机分为两组,治疗组40例以理血饮加减治疗(处方:黄芪,海螵蛸,茜草,白芍,丹皮,白茅根,藕节,女贞子,旱莲草),对照组40例以血尿安胶囊治疗。两组疗程均为1个月。主要观察临床疗效及对IL-1、TNF-α的影响。结果:总有效率治疗组为95%,对照组为85%,两组比较差异显著,(P<0.05)。且治疗后血中IL-1活性、TNF-α浓度明显降低,与对照组比较差异显著(P<0.01)。治疗组无不良反应发生,而对照组有2例因肝功能受损退出试验。结论:理血汤加减对紫癜性肾炎血尿有显著疗效,其作用机制可能与降低血中IL-1活性、TNF-α浓度,调节免疫有关。     

An 18-months' evaluation of self-etch and etch & rinse adhesive in non-carious cervical lesions

Objective. In this intra-individual comparison (an 18-months' randomized, controlled prospective study), we evaluated the clinical performance of one self-etch and one “etch & rinse” adhesive in non-carious cervical lesions. Methods. Twenty-five patients with at least two pairs of similar-sized non-carious cervical lesions participated. Seventy-eight restorations were placed; 39 with etch & rinse (Single-Bond) and 39 with self-etch (Adper Prompt). Both adhesives were combined with the microfilled resin composite Filtek-A110. The restorations were evaluated at baseline, 6, 12, and 18 months according to slightly modified USPHS criteria. Statistical differences between the adhesives was tested with McNemar's test and clinical degradation over time for each material with the Fisher exact test (α=0.05). Results. Thirty pairs were evaluated at 12 and 18 months. Two self-etch restorations were lost after 18 months. Nine Adper Prompt and four Single-Bond restorations scored bravo for marginal adaptation at 18 months (p<0.05). Nine Adper Prompt and three Single-Bond restorations scored bravo for marginal discoloration (p<0.05). Conclusions. Both adhesive systems showed acceptable clinical retention rates according to the ADA full acceptance criteria for enamel-bonding systems in class V non-carious lesions. The self-etch adhesive showed a faster progressive marginal degradation.     

Association of light-to-moderate alcohol drinking in pregnancy with preterm birth and birth weight: elucidating bias by pooling data from nine European cohorts

Women who drink light-to-moderately during pregnancy have been observed to have lower risk of unfavourable pregnancy outcomes than abstainers. This has been suggested to be a result of bias. In a pooled sample, including 193 747 live-born singletons from nine European cohorts, we examined the associations between light-to-moderate drinking and preterm birth, birth weight, and small-for-gestational age in term born children (term SGA). To address potential sources of bias, we compared the associations from the total sample with a sub-sample restricted to first-time pregnant women who conceived within six months of trying, and examined whether the associations varied across calendar time. In the total sample, drinking up to around six drinks per week as compared to abstaining was associated with lower risk of preterm birth, whereas no significant associations were found for birth weight or term SGA. Drinking six or more drinks per week was associated with lower birth weight and higher risk of term SGA, but no increased risk of preterm birth. The analyses restricted to women without reproductive experience revealed similar results. Before 2000 approximately half of pregnant women drank alcohol. This decreased to 39% in 2000–2004, and 14% in 2005–2011. Before 2000, every additional drink was associated with reduced mean birth weight, whereas in 2005–2011, the mean birth weight increased with increasing intake. The period-specific associations between low-to-moderate drinking and birth weight, which also were observed for term SGA, are indicative of bias. It is impossible to distinguish if the bias is attributable to unmeasured confounding, which change over time or cohort heterogeneity.     

Quadrant通道下单侧后路腰椎椎体间融合术与传统开放手术治疗退行性腰椎疾病的初步比较分析

目的 比较分析采用Quadrant通道与传统开放单侧后路腰椎椎体间融合术治疗退行性腰椎疾病的临床效果及优缺点.方法 2008年1月～2011年6月,87例退行性腰椎疾病患者采用随机分组行单侧后路腰椎椎体间融合术,其中40例采用Quadrant通道微创手术治疗,47例采用传统开放手术治疗作为对照.比较两组手术时间、术中失血量及术后住院时间等,采用VAS疼痛评分、ODI功能障碍评分和改良MacNab分级进行疗效评定.结果 全部病例随访12～52个月,平均26.7个月.两组手术时间、出血量、术后住院时间等差异有统计学意义.两组术后VAS疼痛评分比较差异有统计学意义(P＜0.05) ;两组ODI功能障碍评分和改良MacNab分级评定差异无统计学意义.结论 Quadrant通道下单侧后路腰椎椎体间融合术治疗退行性腰椎疾病具有术中出血量少、创伤小、术后恢复快、疗效确切等优点,是临床上可行的实用的一种脊柱微创术式,与传统开放式手术比较疗效相近,为退行性腰椎疾病的外科治疗提供又一选择,但由于提供的操作空间有限,手术视野小,所以病例选择及手术操作熟练程度显得尤其重要.