双氯芬酸钠滴眼液控制准分子激光上皮角膜磨镶术后反应的临床评价

目的观察评价双氯芬酸钠滴眼液控制准分子激光上皮下角膜磨镶术（LASEK）术后疼痛及炎性反应的疗效和安全性。方法用自身对照法观察75例（150眼）接受LASEK的患者,一眼应用双氯芬酸钠滴眼液作为试验组,另一眼用常规药物治疗作为自身对照组,观察1个月。结果两组在控制术后疼痛及炎性反应方面比较差异有统计学意义,试验组未见严重的并发症和不良反应。结论双氯芬酸钠滴眼液是控制LASEK术后眼部疼痛及炎性反应的安全、有效的药物。     

富血小板血浆对体外培养条件下人真皮成纤维细胞增殖能力的影响

目的:探讨富血小板血浆(PRP)对人真皮成纤维细胞(hDFbs)在体外培养条件下增殖能力的影响,探讨PRP促进皮肤、黏膜伤口愈合的机制.方法:PRP和hDFbs来源于健康成年人,两次离心法制备PRP,倒置相差显微镜观察0、12.5%、25.0%、50.0%和100.0%PRP浓度作用下 hDFbs的增殖;免疫细胞化学检...     

1,2-丙二醇体内外安全性实验研究

目的 从体内和体外分别考察1,2-丙二醇气管内雾化给药局部刺激性、体外溶血性和细胞毒性,初步评价1,2-丙二醇吸入给药安全性。方法 取大鼠,采用气管内雾化给药方式给予30% 1,2-丙二醇200 μL,连续5 d,评价1,2-丙二醇吸入给药对肺部的局部刺激性;采用体外试管法肉眼观察和紫外分光光度计法计算溶血率考察1,2-丙二醇的溶血性;采用MTT法研究1,2-丙二醇对人肺腺癌细胞A549、人支气管上皮细胞16HBE、大鼠气管上皮细胞RTE的不良反应,分别计算IC₅₀值。结果 1,2-丙二醇气管内雾化给药后,动物出现极轻度的血管壁周围水肿,极轻度到轻度的肺脏局部支气管内炎症细胞浸润,溶剂对照出现极轻度到轻度的血管壁周围水肿。当1,2-丙二醇浓度≥50%,溶血试验肉眼观察发现,温育1 h上层略偏红色,温育时间延长,颜色略加深,3 h温育结束,发生溶血,但未见凝聚现象;采用紫外分光光度计法计算溶血率均>5%,均有溶血发生。细胞毒性试验中,1,2-丙二醇体积分数在0.12%~10%,对A549、16HBE及RTE的细胞不良反应存在一定的量效关系,相关系数R²值分别为0.986,0.989,0.993,IC₅₀分别为2.538%,2.015%,1.983%。结论 气管内雾化给予1,2-丙二醇对肺部刺激性较小,肺部耐受性较好。浓度≥50%时,可引起溶血。体积分数达到2%时,1,2-丙二醇对A549、16HBE和RTE细胞有显著的不良反应。本研究为1,2-丙二醇吸入途径应用的安全性提供了毒理学数据参考。     

Silk fibroin scaffolds loaded with angiogenic genes in adenovirus vectors for tissue regeneration

Vascularization remains a critical challenge in dermal tissue regeneration. In this study, a vascular endothelial growth factor (VEGF165) and angiopoietin‐1 (Ang‐1) dual gene coexpression vector that encoded green fluorescent protein (GFP) was constructed from an arginine–glycine–aspartic acid‐modified adenovirus. Silk fibroin (SF) scaffolds loaded with adenovirus vectors were fabricated by freeze‐drying method. In vitro, the human endothelial‐derived cell line EA.hy926 was infected with adenovirus vectors and then expressed GFP, secreted VEGF165 and Ang‐1, and promoted cell proliferation effectively. The VEGF165 and Ang‐1 genes loaded in the SF scaffolds significantly promoted the formation of abundant microvascular networks in the chick embryo chorioallantoic membrane. In vivo, angiogenic genes loaded in the scaffolds promoted vascularization and collagen deposition in scaffolds, thus effectively accelerating dermal tissue regeneration in a dorsal full‐thickness skin defect wound model in Sprague–Dawley rats. In conclusion, SF scaffolds loaded with arginine–glycine–aspartic acid‐modified adenovirus vectors encoding VEGF165 and Ang‐1 could stimulate the formation of vascular networks through the effective expression of target genes in vascular endothelial cells, thereby accelerating the regeneration of dermal tissue.     

Promotion of dermal regeneration using pullulan/gelatin porous skin substitute

Tissue‐engineered dermal substitutes represent a promising approach to improve wound healing and provide more sufficient regeneration, compared with current clinical standards on care of large wounds, early excision, and grafting of autografts. However, inadequate regenerative capacity, impaired regeneration/degradation profile, and high cost of current commercial tissue‐engineered dermal regeneration templates hinder their utilization, and the development of an efficient and cost‐effective tissue‐engineered dermal substitute remains a challenge. Inspired from our previously reported data on a pullulan/gelatin scaffold, here we present a new generation of a porous pullulan/gelatin scaffold (PG2) served as a dermal substitute with enhanced chemical and structural characteristics. PG2 shows excellent biocompatibility (viability, migration, and proliferation), assessed by in vitro incorporation of human dermal fibroblasts in comparison with the Integra® dermal regeneration template (Control). When applied on a mouse full‐thickness excisional wound, PG2 shows rapid scaffold degradation, more granulation tissue, more collagen deposition, and more cellularity in comparison with Control at 20 days post surgery. The faster degradation is likely due to the enhanced recruitment of inflammatory macrophages to the scaffold from the wound bed, and that leads to earlier maturation of granulation tissue with less myofibroblastic cells. Collectively, our data reveal PG2's characteristics as an applicable dermal substitute with excellent dermal regeneration, which may attenuate scar formation.     

Ocular irritation reversibility assessment for personal care products using a porcine corneal culture assay

Personal care product manufacturers have used a broad spectrum of alternative ocular irritation assays during the past two decades because these tests do not require the use of live animals, they provide reliable predictive data, and they are relatively inexpensive to conduct. To complement these assays, the ex vivo Porcine Corneal Opacity Reversibility Assay (PorCORA) was recently developed using a corneal culture model to predict reversibility of ocular irritants. Three commercially available consumer products (a shampoo, a hair color glaze, and a hair colorant system containing 12% hydrogen peroxide) were each tested in two PorCORA study replicates in order to assess potential ocular damage reversibility for surfactant-, propylene carbonate-, and peroxide-based formulations, respectively. Under the exaggerated, in vitro study conditions, the surfactant-based shampoo may cause irreversible porcine corneal damage (histological changes in the epithelial squamous cell and/or basal cell layers), whereas the hair color glaze and 12% hydrogen peroxide product caused fully reversible ocular irritation (microscopic changes only in the superficial squamous cell layer). The hair color glaze and peroxide product results correlate with established in vivo data for similar compounds, but the shampoo results contradicted previous BCOP results (expected to be only a mild irritant). Therefore, although the PorCORA protocol shows promise in predicting the extent and reversibility of potential ocular damage caused by accidental consumer eye exposure to personal care products, the contradictory results for the surfactant-based shampoo indicate that more extensive validation testing of the PorCORA is necessary to definitively establish the protocol’s reliability as a Draize test replacement.     

Porcine Corneal Ocular Reversibility Assay (PorCORA) predicts ocular damage and recovery for global regulatory agency hazard categories

In this study, we examined the capacity of the Porcine Corneal Ocular Reversibility Assay (PorCORA) to classify the reversibility of ocular effects for 32 test compounds (20 reversible, 12 irreversible) from various chemical classes. PorCORA predicted 28 of 32 compounds correctly when compared to historical rabbit eye test data. The correlation coefficient for PorCORA versus historical rabbit test data was 0.84, based on the last day of damaged cornea reversal. These results demonstrate a high correlation between corneal irritation recovery time in the PorCORA and the rabbit eye. When compared to historical Modified Maximal Average Score (MMAS) in rabbit eyes, PorCORA yielded a correlation coefficient of 0.80, demonstrating ability to predict MMAS. PorCORA was highly predictive of regulatory agency ocular hazard classification categories, resulting in 91% accuracy for EU R41 and GHS Category 1. PorCORA was also predictive of EPA Category I (88% accuracy). Overall, the accuracy (88–91%), sensitivity (79–86%), specificity (94%), positive predictivity (94%), and negative predictivity (85–89%) for all three regulatory classifications indicate that ocular irritation hazardous effects were well predicted by the PorCORA. This study suggests that PorCORA could help discriminate between EU R36 and R41, GHS Categories 1 and 2, and EPA Categories I and II.     

Influence of different techniques of secondary cleft lip revision surgery on upper lip projection

Patient dissatisfaction with labial appearance in the adult cleft lip is frequently linked to poor upper lip projection. Other areas of concern include asymmetry and impaired upper lip height. Different surgical techniques are available to address volumetric deficiencies, according to extent and localization. However, data comparing outcomes in these different areas are limited. The main aim of this study was to assess the relative gains in upper lip projection. An evaluation of upper vermilion height and symmetry was also performed. Thirty-seven consecutive patients treated by a single surgeon had their pre- and postoperative results measured using standardized photographs; these were analysed using subjective and objective outcome measures. Seven examiners evaluated anonymized pre- and postoperative side and front views for subjective evaluation. The objective analysis was performed using Adobe Photoshop. Fifteen lip revisions, four Abbe flaps, 12 dermal grafts, and six PermaLip implants were performed. In bilateral cleft lip and palate patients, Abbe flaps showed the most significant improvement in labial projection, followed by PermaLip implants and dermal grafts. In unilateral cleft lip and palate patients, PermaLip implants best addressed impaired lip projection, followed by dermal grafts. Overall, functional lip revisions showed excellent outcomes for upper lip symmetry; however, only minor changes in labial projection were found.     

脱细胞真皮基质与上皮下结缔组织瓣治疗牙龈退缩效果的系统评价

目的系统评价脱细胞真皮基质(ADM)与上皮下结缔组织瓣(sCTG)治疗牙龈退缩(GR)的效果。方法计算机检索PubMed、EMbase、The Cochrane Library、Web of Science、CNKI、WanFang Data和VIP数据库,搜集有关ADM和sCTG比较治疗GR疗效的随机对照试验(RCT),检索时限均从建库至2019年7月11日。由2名研究者独立筛选文献、提取资料并评价纳入研究的偏倚风险后,采用RevMan 5.3和Stata 12.1软件进行Meta分析。结果共纳入9个RCT。Meta分析结果显示:术后两组探诊深度(PD)[MD(3月)=-0.04,95%CI(-0.18,0.11),P=0.63]、[MD(6月)=-0.01,95%CI(-0.13,0.12),P=0.90]和GR程度[MD(3月)=-0.10,95%CI(-0.37,0.18),P=0.48]、[MD(6月)=-0.02,95%CI(-0.33,0.29),P=0.89]的差异均无统计学意义。但sCTG组术后3个月的临床附着丧失(CAL)偏少[MD=0.33,95%CI(0.00,0.66),P=0.05]、术后6个月的角化龈宽度(KTW)更大[MD=-0.48,95%CI(-0.76,-0.20),P=0.000 7],差异均有统计学意义。结论现有证据表明,ADM与sCTG术后3个月及6个月的PD、GR程度无差异;sCTG组术后3个月CAL和术后6个月KTW较ADM组更具优势。受纳入研究数量和质量的限制,上述结论尚待更多高质量研究予以验证。     

用于替代皮肤刺激试验的组织工程表皮模型的构建研究

目的探讨人表皮细胞与聚碳酸脂膜构建组织工程表皮模型的方法,建立可用于皮肤刺激试验的组织工程表皮模型。方法应用组织工程方法,以聚碳酸脂膜为支架,以人皮肤角质形成细胞为细胞来源,构建组织工程表皮模型。气液面培养13 d,通过HE染色、角蛋白10(keratin 10,K10)和K13抗体、K14抗体、层粘连蛋白抗体、角化细胞交联外膜蛋白抗体、中间丝相关蛋白抗体免疫荧光染色、透射电镜观察组织工程表皮模型组织结构。采用快速渗透试验方法,SDS分别作用于培养基中添加脂质物(实验组)和未添加脂质物(对照组)的组织工程表皮模型18 h,测定组织活性减小50%所需化学物质的浓度(half maximal inhibitory concentration of a substance,IC50)值。结果 HE染色、免疫荧光染色及透射电镜观察显示,构建的组织工程表皮模型分化良好,具有与正常表皮相似的结构:基底膜、棘层、颗粒层和角化层。实验组和对照组组织工程表皮模型的IC50值分别为0.183%(6.00 mmol/L)和0.072%(2.36 mmol/L)。结论在聚碳酸酯膜上构建的组织工程表皮模型具有与正常表皮相似的组织结构,并且具有一定的屏障功能。