羟氯喹及没食子酸酯对HaCaT细胞光照射的影响

目的 探讨羟氯喹和绿茶活性成分表没食子儿茶素没食子酸酯(EGCG)对中波紫外线(UVB)损伤永生化角质形成细胞株(HaCaT细胞)的保护作用及其机制。方法 采用UVB定时及定量照射培养的HaCaT细胞,分别加入羟氯喹和EGCG干预处理,以RT-PCR法检测各受试组p53、p21、c-fos基因表达水平。结果 UVB照射后可明显增加HaCaT细胞中p53,p21,c-fos mRNA表达,羟氯喹和EGCG可不同程度地下调上述基因表达水平。结论 羟氯喹和EGCG的光保护作用在HaCaT细胞可能与其抑制p53,p21,c-fos基因表达有关。     

中波紫外线对HaCaT细胞凋亡、细胞周期变化及p16、c-myc蛋白表达的影响及阿魏酸干预作用研究

目的观察传统中药川芎的有效成份阿魏酸(ferulic)对中波紫外线(UVB)辐射引起的人表皮角质形成细胞系HaCaT细胞凋亡、细胞周期及对p16、c-myc蛋白水平变化的影响,以探讨其光保护作用与机制。方法培养HaCaT细胞,以不同剂量UVB和200mg/mL浓度的阿魏酸处理细胞,以流式细胞仪检测0、30、60和90mJ/cm~2的UVB照射后24h细胞周期和凋亡率变化;以Western blot方法检测30mJ/cm~2UVB照射后p16、c-myc蛋白的表达水平。结果UVB照射诱导HaCaT细胞产生凋亡,凋亡率呈UVB剂量增加而升高;30mJ/cm~2剂量下细胞可出现明显S期阻滞,但高剂量时S期细胞数量相对下降;照光后p16、c-myc蛋白水平均增高。加入阿魏酸处理可抑制UVB引起的上述改变。结论阿魏酸可明显抑制UVB引起的凋亡与细胞周期阻滞以及p16、c-myc蛋白表达。     

中波紫外线对HaCaT细胞核因子-κB和p53表达的影响

目的研究中波紫外线(UVB)对HaCaT细胞核因子-κB(NF-κB)和p53表达的影响。方法以60mJ/cm2的UVB照射HaCaT细胞后8h、16h和24h,采用real time PCR和western blot等技术检测NF-κB和p53的表达情况。结果 1与未处理组相比,UVB照射HaCaT细胞8h、16h和24h后,NF-κB mRNA水平升高程度分别为27%、32%和42%,p53 mRNA水平升高程度分别为13%、20%和28%;2未处理组HaCaT细胞NF-κB和p53蛋白的表达水平分别为0.3989±0.04802和0.3018±0.03605,UVB照射8h、16h和24h后,二者的表达均随时间延长而升高,NF-κB为0.4283±0.0195、0.5976±0.0401和0.8255±0.0214,p53为0.3925±0.0244、0.4595±0.0362和0.5811±0.0482,差异有统计学意义(P0.05)。结论 UVB可致HaCat细胞中NF-κB和p53表达水平升高。     

黄芩苷对中波紫外线所致HaCaT细胞凋亡、细胞周期变化及p16、原癌基因c-myc蛋白表达的影响

目的:观察中波紫外线(UVB)辐射引起的人表皮角质形成细胞株HacaT细胞凋亡、细胞周期及p16、c-myc蛋白水平的影响及传统中药黄芩苷(baicalin)对它的干预作用.方法:以200 mg/L黄芩苷预处理HacaT细胞,以流式细胞仪检测经0、30、60和90 mJ/cm2的UVB照射后24 h细胞周期和凋亡率变化;以Western blot方法检测90 mJ/cm2 UVB照射后p16、c-myc 蛋白的表达水平.结果:UVB照射可诱导HaCaT细胞产生凋亡,凋亡率呈剂量依赖性增加;30 mJ/cm2 剂量下细胞可出现明显S期阻滞,随UVB剂量增大,S期细胞数量相对下降;照光后p16、c-myc蛋白水平均有所增高.加入黄芩苷处理可抑制UVB引起的上述变化.结论:黄芩苷可明显抑制UVB引起的凋亡与细胞周期阻滞以及p16、c-myc蛋白表达,证实该药具有有效的光保护作用.     

绿茶提取物及羟氯喹对表皮细胞光保护生物学效应的研究

目的观察羟氯喹及没食子儿茶素没食子酸脂(EGCG)对中波紫外线(UVB)照射引起的人永生化角质形成细胞系HaCaT细胞增殖活性变化及凋亡的影响。方法采用剂量分别为0、30、60、90mJ/cm~2的UVB照射培养的HaCaT细胞并加入羟氯喹及EGCG,共孵育24h后以四甲基偶氮唑蓝还原法(MTT)检测细胞活性,流式细胞仪检测细胞周期和凋亡率变化。结果UVB照射后HaCaT细胞出现增殖活性下降,其幅度与辐射强度成正比;加入羟氯喹及EGCG可使细胞活性有一定程度恢复;此外,UVB照射可诱导HaCaT细胞产生凋亡,凋亡率呈UVB剂量依赖方式增加;30mJ/cm~2UVB照射可使HaCaT细胞出现明显S期阻滞,随UVB剂量增大,S期细胞数量相对下降;加入药物处理可抑制上述改变。结论羟氯喹和EGCG可明显抑制UVB引起的HaCaT细胞增殖活性下降、凋亡与细胞周期阻滞。     

表没食子儿茶素没食子酸酯对紫外线诱导的角质形成细胞分泌血管内皮生长因子的影响

目的：研究绿茶中表没食子儿茶素没食子酸酯（EGCG）对中波紫外线（UVB）诱导角质形成细胞HaCaT株（简称HaCaT细胞）分泌血管内皮生长因子（VEGF）的影响。方法：试验共设立空白对照组、单纯加药组、单纯照光组和加药照光组4组，以15mJ/cm^2 UVB的剂量照射细胞，酶联免疫吸附试验（EUSA）方法检测不同时间细胞上清液中VEGF含量。反转录（RT）-PCR测定VEGFmRNA表达。结果：UVB照射后，HaCaT细胞分泌的VEGF在照光后12h开始明显增加，随时间延长。VEGF水平逐渐增加。EGCG对UVB诱导的VEGF升高有明显抑制作用。在12、18、24h3个时间点．EGCG明显抑制VEGF水平的升高。结论：EGCG可以抑制紫外线诱导的HaCaT细胞分泌VEGF。     

表没食子儿茶素没食子酸酯对中波紫外浅诱导的人皮肤成纤维细胞基质金属蛋白酶-1表达的影响

目的:研究中波紫外线(UVB)诱导人皮肤成纤维细胞(FB)表达基质金属蛋白酶(MMP)-1和表没食子儿茶素没食子酸酯(EGCG)及c-Jun氨基端激酶(JNK)抑制剂SP600125对该诱导的保护作用.方法:以30 mJ/cm2 UVB及12.5μg/mL EGCG处理FB.同时以SP600125为对照,照光和(或)加药后于相应时间点提取上清及总RNA,以ELISA法检测MMP-1表达,反转录(RT)-PCR法检测细胞中MMP-1 mRNA含量.结果:30 mJ/cm2 UVB照射FB后24h MMP-1表达为对照组的3.1倍,12h及24h时MMP-1 mRNA表达分别增加至对照组的2.60倍及2.66倍(P均<0.05).UVB照射前、后加EGCG及SP600125组较单纯UVB照射组显著抑制MMP-1的表达,MMP-1 mRNA含量分别为单纯照射组的71.9%及40.4%,MMP-1蛋白表达量分别为单纯照射组的61.8%及48.9%.结论:UVB照射FB后MMP-1 mRNA及MMP-1表达水平均显著增加,EGCG可抑制UVB所致的MMP-1 mRNA及MMP-1高表达.     

p53蛋白在UVB诱导凋亡的富集表皮干细胞的角质形成细胞中的表达

目的研究p53蛋白在中波紫外线(ultraviolet lightB,UVB)诱导凋亡的富集表皮干细胞的角质形成细胞群中的表达情况。方法分离富集人表皮干细胞的角质形成细胞群和正常角质形成细胞群,使用UVB诱导两种细胞群凋亡,蛋白印迹法比较不同剂量UVB诱导前后两组细胞的p53蛋白表达的差异。结果两种细胞在不同剂量的UVB照射后p53蛋白表达均比照射前显著增加,在20mJ/cm2与40mJ/cm2照射剂量时,富集人表皮干细胞的角质形成细胞群p53蛋白表达高于正常角质形成的细胞群,差异有统计学意义(P<0.05)。结论富集人表皮干细胞的角质形成细胞p53蛋白表达比其它角质形成细胞对中波紫外线的照射易感。     

黑果枸杞水提取物抑制UVB辐射后HaCaT细胞的凋亡及p16、p53蛋白表达

目的：明确黑果枸杞水提取物对中波紫外线(UVB)辐射引起的HaCaT细胞凋亡及p16、p53蛋白表达的影响。方法： 体外培养HaCaT细胞,分为对照组、UVB组、UVB+黑果枸杞水提取物组,UVB照射剂量为30 mJ/cm2 UVB,黑果枸杞水提取物浓度为2 mg/mL。流式细胞仪检测各组UVB照射后24 h细胞凋亡率,Western blot检测各组HaCaT细胞p16、p53蛋白的表达水平。结果：与对照组（6.12±1.19）%比较,UVB组HaCaT细胞凋亡率为(74.89±3.90)%、UVB+黑枸杞水提取物组为（57.52±2.93）%,差异有统计学意义（P<0.05）。对照组p16和p53蛋白水平为0.1±0.03和0.21±0.07,UVB组为0.28±0.06和0.5±0.04、UVB+黑枸杞水提取物组为0.15±0.025和0.25±0.01,差异均有统计学意义（Ps<0.05）。结论：黑果枸杞水提物可抑制UVB引起的HaCaT细胞凋亡以及p16、p53蛋白表达。     

蒿甲醚对紫外线照射后HaCaT细胞表达Fas和Bcl-2的影响

目的:为探讨蒿甲醚治疗光敏性皮肤病的机制,观察一定剂量的中波紫外线(UVB)照射HaCaT细胞后,不同浓度蒿甲醚对HaCaT细胞活性的影响及其表达凋亡相关蛋白Fas和Bcl-2的影响.方法:采用45.00 mJ/cm2剂量UVB照射培养的永生化HaCaT角质形成细胞,以羟氯喹及不同浓度的蒿甲醚进行干预处理,应用四甲基偶氮唑蓝(MTT)法及免疫组化检测紫外线照射及经羟氯喹和篙甲醚处理后HacaT细胞活性变化及其Fas和Bcl-2蛋白水平的变化.结果:①羟氯喹及小剂量(≤50mg/L)蒿甲醚对细胞活性影响不明显,而≥100mg/L蒿甲醚增加细胞活性.但浓度超过200mg/L,可见大量细胞悬浮于培养液上;②与未照射组相比UVB照射可使HaCaT细胞表达Fas增加;③与UVB组相比,UVB 羟氨喹(Q)组、UVB 25 mg/L蒿甲醚(H1)组、UVB 50mg/L蒿甲醚(H2)组、UVB 100mg/L蒿甲醚(H3)组使HaCaT细胞表达Fas减少;④与未照射组相比,UVB照射可使HaCaT细胞表达Bcl-2减少;⑤与UVB组相比,UVB Q组、UVB H1组、UVB H2组、UVB H3组可以使HaCaT细胞表达Bcl-2增加.结论:小剂量(25 mg/L、50 mg/L、100 mg/L)蒿甲醚可以抑制HaCaT细胞凋亡,具有一定的保护作用.蒿甲醚可能通过影响与凋亡相关的Fas和Bcl-2表达,减少紫外线诱导的HaCaT细胞凋亡.     

New fillers for the new man

ABSTRACT:  Two new collagen-based lidocaine-containing dermal fillers, ArteSense™/ArteFill™ (Artes Medical, San Diego, CA) and Evolence® (Colbar LifeScience Ltd., Herzliya, Israel), have proved to be of particular interest to men, many of whom seek a long-lasting or permanent correction. ArteFill™ has been available in the United States since 2006, and it is expected that Evolence® will reach the American market in 2008. The properties of the two products will be described, and experience based on the administration of many hundreds of syringes of both products by a Canadian dermatologist will be detailed here, with tips and precautions to optimize patient outcomes.     

Outcomes and adverse effects of ablative vs nonablative lasers for skin resurfacing: A systematic review of 1093 patients

It is generally believed that ablative laser therapies result in prolonged healing and greater adverse events when compared with nonablative lasers for skin resurfacing. To evaluate the efficacy of ablative laser use for skin resurfacing and adverse events as a consequence of treatment in comparison to other modalities, a PRISMA‐compliant systematic review (Systematic Review Registration Number: 204016) of twelve electronic databases was conducted for the terms “ablative laser” and “skin resurfacing” from March 2002 until July 2020. Studies included meta‐analyses, randomized control trials, cohort studies, and case reports to facilitate evaluation of the data. All articles were evaluated for bias. The search strategy produced 34 studies. Of 1093 patients included in the studies of interest, adverse events were reported in a total of 106 patients (9.7%). Higher rates of adverse events were described in nonablative therapies (12.2% ± 2.19%, 31 events) when compared with ablative therapy (8.28% ± 2.46%, 81 events). 147 patients (13.4%) reported no side effects, 68 (6.22%) reported expected, transient self‐resolving events, and five (0.046%) presented with hypertrophic scarring. Excluding transient events, ablative lasers had fewer complications overall when compared with nonablative lasers (2.56% ± 2.19% vs 7.48% ± 3.29%). This systematic review suggests ablative laser use for skin resurfacing is a safe and effective modality to treat a range of pathologies from photodamage and acne scars to hidradenitis suppurativa and posttraumatic scarring from basal cell carcinoma excision. Further studies are needed, but these results suggest that ablative lasers are a superior, safe, and effective modality to treat damaged skin.     

Multiple New-Onset Subcutaneous Nodules of the Upper Extremity Digits: Giant Cell Tumor of Tendon Sheath and Lipoma

A black woman with the concurrent onset of two subcutaneous nodules located on the digits of her upper extremities is described. Initially, a single systemic disorder was considered; yet, the lesions differed in morphology and consistency. Microscopic examination of the nodules showed a giant cell tumor of tendon sheath and a lipoma. Although Occam's “razor” suggests that multiple lesions in the same person are more likely to represent variable manifestations of a single disorder than several different diseases in that individual, the simultaneously appearing lesions in this patient represented two different conditions.     

Deutliche Einschränkung der Lebensqualität bei Patienten mit Pemphigus vulgaris: Ergebnisse der deutschen Bullous Skin Disease (BSD)‐Studiengruppe

Background: Pemphigus vulgaris is a potentially life‐threatening autoimmune disorder of the skin and mucous membranes characterized by antibodies against epidermal adhesion molecules. Clinically characteristic are painful chronic blisters or erosions of mucous membranes and skin. There are no published studies on the impact o this disease on quality of life. Patients and methods: This registration was performed within the scope of the German BSD (Bullous Skin Disease) study group, from November 1997 until January 2002. A total of 36 patients with the first diagnosis of pemphigus vulgaris were registered at the university hospitals of Dresden, Erlangen, Kiel, Mannheim, München and Würzburg. Thirty of the 36 (83 %) patients participated in the quality of life questionnaire utilizing the German version of ‘Dermatology Life Quality Index’ (DLQI) provided by A. Y. Finlay. The DLQI varies from 0 to 30 with an increased DLQI score indicating a decrease in quality of quality. Results: The overall DLQI total score of 10 ± 6,7 in the investigated pemphigus patients was significantly increased in comparison to other skin diseases. Conclusions: These results suggest that the DLQI can be a very useful additional outcome criteria for clinical studies with pemphigus vulgaris and in the treatment of these patients.     

Genetic alterations in RAS‐regulated pathway in acral lentiginous melanoma

Studies integrating clinicopathological and genetic features have revealed distinct patterns of genomic aberrations in Melanoma. Distributions of BRAF or NRAS mutations and gains of several oncogenes differ among melanoma subgroups, while 9p21 deletions are found in all melanoma subtypes. In the study, status of genes involved in cell cycle progression and apoptosis was evaluated in a panel of 17 frozen primary acral melanomas. NRAS mutations were found in 17% of the tumors. In contrast, BRAF mutations were not found. Gains of AURKA gene (20q13.3) were detected in 37.5% of samples, gains of CCND1 gene (11q13) or TERT gene (5p15.33) in 31.2% and gains of NRAS gene (1p13.2) in 25%. Alterations in 9p21 were identified in 69% of tumors. Gains of 11q13 and 20q13 were mutually exclusive, and 1p13.2 gain was associated with 5p15.33. Our findings showed that alterations in RAS‐related pathways are present in 87.5% of acral lentiginous melanomas.     

Medición del impacto psicológico en pacientes con psoriasis en tratamiento sistémico

Background and objectives

The negative impact of psoriasis on patient quality of life can be as important as the physical consequences of the disease. We could assume that clearance of the disease would also lead to an improvement in its psychosocial impact. The present study assesses the psychological state of patients with psoriasis receiving systemic treatment in a psoriasis unit, especially those with mild or no disease involvement.