Effect of inflammation on endothelial cells induced by poly-L-lactic acid degradation in vitro and in vivo

Abstract

As a promising candidate, biodegradable Poly-L-lactic Acid (PLLA) has been extensively used in coronary artery stents. In our previous reports, PLLA stents implanted in porcine coronary arteries showed safety without stent thrombosis. However, inflammatory responses were observed, which needed further study. In this study, human aortic endothelial cells (HAEC) were treated with different volume percentages of extract of pre-degraded PLLA (extract of PLLA) in vitro, and the cell growth curve and morphological changes were examined. The expression of inflammatory cytokines such as NF-κB, VEGF and VCAM-1 were also observed by ELISA. In addition, PLLA stent was implanted in porcine coronary artery to examine morphological changes, functional marker eNOS and inflammatory responses. The extract of PLLA caused significant growth inhibition and release of NF-κB, VEGF and VCAM-1 in HAEC with volume percentage-dependence. Although re-endothelialization and expression of eNOS was observed, expression of NF-κB and lymphocytes surrounding PLLA were also found after PLLA stents were implanted in the artery. This study demonstrated the effects of inflammation on endothelial cells induced by PLLA degradation in vitro and showed the inflammation in vivo, suggesting that anti-inflammatory strategy is necessary for PLLA stent implantation in the artery.     

神经血管治疗仪联合前列地尔等治疗糖尿病足疗效观察

目的探讨神经血管治疗仪联合前列地尔等治疗糖尿病足的临床疗效。方法将70例糖尿病足患者随机分为2组,每组各35例。试验组给予神经血管治疗仪、红外线照射疼痛治疗仪联合前列地尔治疗,并给予无菌换药;对照组仅给予前列地尔针剂等药物和无菌换药治疗。观察两组的临床疗效、平均住院时间、症状体征消失时间、ABI指标水平。结果试验组的总有效率显著高于对照组(P<0.05);平均住院时间和症状体征消失时间显著短于对照组(P<0.05);ABI指标水平显著优于对照组(P<0.05)。结论神经血管治疗仪、红外线照射疼痛治疗仪联合前列地尔、无菌换药治疗糖尿病足临床疗效显著,值得临床推广应用。     

目标性培训在消毒供应中心培训中的应用

目的 探讨目标性培训方法在消毒供应中心岗位人员器械培训中的应用效果。方法 本研究为随机对照试验。选取2021年4月至7月在揭阳市人民医院消毒供应中心从事手术组工作的 20名 33～45岁女性岗位人员作为培训对象，采用随机数字表法将其分为对照组和观察组，各 10名。 对照组应用传统的培训方法，观察组应用目标性培训方法。培训后比较两组人员操作技能考核成绩、 培训满意度、负责清洗包装腹腔镜基础器械包的清洗质量和包装质量合格率。符合正态分布的计量资料采用均数±标准差（xˉ ± s）表示，组间比较采用独立样本t检验；计数资料采用例数或率（%）表示， 组间比较采用卡方检验；P＜0.05为差异有统计学意义。结果 观察组考核成绩、培训满意度及其负责清洗包装的腹腔镜基础器械包清洗质量、包装质量合格率明显高于对照组［（90.2±6.1）分比（77.0± 7.5）分、（90.0±6.0）分比（72.1±9.8）分、487（97.4%）比453（90.6%）、492（98.4%）比472（94.4%）］，差异有统计学意义（均P＜0.05）。结论 在消毒供应中心岗位人员器械培训时应用目标性培训方法，可有效提高岗位人员考核成绩及培训满意度及其负责清洗包装的腹腔镜基础器械包清洗质量、包装质量合 格率，保障患者安全。     

An evaluation of microleakage of various glass ionomer based restorative materials in deciduous and permanent teeth: An in vitro study

AimTo evaluate the microleakage of recently available glass ionomer based restorative materials (GC Fuji IX GP, GC Fuji VII, and Dyract) and compare their microleakage with the previously existing glass ionomer restorative materials (GC Fuji II LC) in primary and permanent teeth.MethodOne hundred and fifty (75 + 75) non-carious deciduous and permanent teeth were restored with glass ionomer based restorative materials after making class I cavities. Samples were subjected to thermocycling after storing in distilled water for 24 h. Two coats of nail polish were applied 1 mm short of restorative margins and samples sectioned buccolingually after storing in methylene blue dye for 24 h. Microleakage was assessed using stereomicroscope.ResultSignificant differences (P < 0.05) were found when inter group comparisons were done. Except when GC Fuji VII (Group III) was compared with GC Fuji II LC (Group II) and Dyract (Group IV), non-significant differences (P > 0.05) were observed. It was found that there was no statistically significant difference when the means of microleakage of primary teeth were compared with those of permanent teeth.ConclusionsGC Fuji IX GP showed maximum microleakage and GC Fuji VII showed least microleakage.     

Chitin-based poly(urea-urethane)s

—Chitins of various origins in DMA-LiCl solution have been reacted with excess 1,6-diisocyanatohexane (three or twelve equivalents per repeating unit) for 4-20 h. The resulting solutions were exposed to water vapor for 2 days and flexible and opaque materials were produced, which upon drying yielded powders whose main characteristics were insolubility in aqueous and organic solvents, remarkable crystallinity, typical infrared spectrum, high N/C ratio (0.287), and a high degree of substitution (0.29). Under the SEM structural features reminiscent of chitin were absent but no thermoplastic behavior was found by differential scanning calorimetry. Chitosan was similarly treated under heterogeneous conditions in anhydrous pyridine, and yielded reaction products with a lower degree of substitution (0.17). With partially hydrolysed chitosan, highly crystalline products were obtained.     

Fluoride bioactive glass paste improves bond durability and remineralizes tooth structure prior to adhesive restoration

ObjectiveThe current study aimed at examining a fluoride containing bioactive glass (BiominF®) paste as a temporary filling material capable of remineralizing the demineralized enamel or dentin, and its ability to decrease a simulated dentinal fluids pressure on the resin/dentin interface, without affecting the shear bond strength of a universal bonding agent to enamel and dentin.Methods60 premolars were utilized for the acid resistance, trans-microradiography (TMR) and shear bond strength (SBS) experiments. Enamel and dentin discs were demineralized for 4 days to create a subsurface demineralized zone followed by applying BiominF® paste, 1.23% acidulated phosphate fluoride, or a temporary filling material for 24 h.30 extracted human non-carious third molars were utilized for the pulpal pressure experiment in which direct communication to the pulp chamber was created by cutting at a level approximately 1 mm below the cemento-enamel junction while the coronal enamel was ground to expose mid coronal dentin. The dentin surface was exposed to a simulated pulpal pressure. The dentin surfaces had BiominF® paste, an oxalate desensitizing agent, or temporary filling material followed by application of a universal adhesive system.ResultsOne way ANOVA showed that BiominF® paste remineralized effectively the demineralized enamel or dentin, did not affect the bond strength of the enamel and dentin surfaces to the tested adhesive system p < 0.05, and improved the acid resistance of the demineralized enamel and dentin against a secondary erosive challenge. Moreover, BiominF® paste decreased the nanoleakage expression in the dentin/adhesive interface exposed to a simulated pulpal pressure.SignificanceBiominF® paste may serve as a temporary filling material that may improve the longevity of adhesive restorations and help to conserve tooth structures by preserving the demineralized enamel and dentin form cutting during cavity preparation.     

Counting primary loops in polymer gels

Much of our fundamental knowledge related to polymer networks is built on an assumption of ideal end-linked network structure. Real networks invariably possess topological imperfections that negatively affect mechanical properties; modifications of classical network theories have been developed to account for these defects. Despite decades of effort, there are no known experimental protocols for precise quantification of even the simplest topological network imperfections: primary loops. Here we present a simple conceptual framework that enables primary loop quantification in polymeric materials. We apply this framework to measure the fraction of primary loop junctions in trifunctional PEG-based hydrogels. We anticipate that the concepts described here will open new avenues of theoretical and experimental research related to polymer network structure.     

肿瘤相关性贫血的治疗

肿瘤相关性贫血是肿瘤相关性炎症或肿瘤相关治疗导致骨髓抑制（主要是放、化疗）引起的贫血。肿瘤相关性 贫血可以发生在肿瘤诊治的任何阶段，其发生与肿瘤类型、分期及治疗等因素密切相关。2012 年国内的调查显示，肿瘤相 关性贫血的发生率为60.83%，其中轻度贫血40.84%，中度贫血15.67%，重度贫血3.47%，极重度贫血0.84%。发病率较高的肿瘤分别为消化道癌、乳腺癌和肺癌等。研究显示，肿瘤相关性贫血会明显降低肿瘤患者的生活质量，影响治疗效果， 缩短生存期，增加死亡风险；而通过合理的治疗，纠正贫血后，可以改善患者的生活质量，提高生存率。肿瘤相关性贫血 的发病机制复杂，可能与肿瘤本身及其并发症（如肿瘤侵犯骨髓、溶血、失血、肿瘤相关性炎症等）、治疗手段引起的骨 髓抑制（化疗、放疗等）等有关。肿瘤相关性贫血的治疗目标为“提高生活质量，降低红细胞输注需求”。在病因治疗的 基础上，补充造血原料（铁剂、叶酸、维生素 B12 等），应用促红细胞生成素类药物及输红细胞治疗为其常用治疗手段。     

Influence of Fermentation and Drying Materials on the Contamination of Cocoa Beans by Ochratoxin A

Ochratoxin A (OTA) is a mycotoxin produced mainly by species of Aspergillus and Penicillium. Contamination of food with OTA is a major consumer health hazard. In Côte d’Ivoire, preventing OTA contamination has been the subject of extensive study. The current study was conducted to evaluate the influence of fermentation and drying materials on the OTA content in cocoa. For each test, 7000 intact cocoa pods were collected, split open to remove the beans, fermented using 1 of 3 different materials, sun-dried on 1 of 3 different platform types and stored for 30 days. A total of 22 samples were collected at each stage of post-harvesting operations. The OTA content in the extracted samples was then quantified by high-performance liquid chromatography. OTA was detected in beans at all stages of post-harvesting operations at varying levels: pod-opening (0.025 ± 0.02 mg/kg), fermentation (0.275 ± 0.2 mg/kg), drying (0.569 ± 0.015 mg/kg), and storage (0.558 ± 0.04 mg/kg). No significant relationships between the detected OTA level and the materials used in the fermentation and drying of cocoa were observed.