TIG2在皮肤鳞癌中的表达及意义

目的:研究TIG2(tazarotene induced gene-2)在皮肤鳞癌中的作用机制.方法:用免疫组化和原位杂交的方法检测正常皮肤组织,未受累组织及鳞癌皮损中TIG2蛋白和mRNA的表达变化.结果:TIG2蛋白和mRNA表达于正常组织及未受累组织的表皮全层;在鳞癌的边缘皮损中,可见TIG2表达于角质层,棘层上中部,而不表达于棘层下部及基底层;在Ⅰ-Ⅱ期鳞癌中,TIG2可轻度表达于分化较好的角化珠周围;而在Ⅲ～Ⅳ期鳞癌中无表达.在正常组织和未受累皮肤中,TIG2的表达高丁鳞癌组织中的表达(P<0.01);边缘皮损基底层中的表达低于正常组织及未受累组织基底层中的表达(P<0.01);在Ⅲ～Ⅳ期鳞癌中的表达明显低于鳞癌边缘皮损中的表达(P<0.01).结论:TIG2可能参与鳞癌的发生和发展.     

Histological effects of tazarotene 0.1% cream vs. vehicle on photodamaged skin: a 6-month, multicentre, double-blind, randomized, vehicle-controlled study in patients with photodamaged facial skin

BACKGROUND: Topical tazarotene has been shown to offer efficacy in ameliorating multiple effects of photodamage. OBJECTIVES: To evaluate the histological effects of tazarotene cream on photodamaged skin. METHODS: In this multicentre, double-blind, randomized, vehicle-controlled study, 50 patients with photodamaged facial skin (at least mild fine wrinkling and mottled hyperpigmentation, with at least one of these being moderate) were randomized to apply tazarotene 0.1% cream or vehicle cream to their face, once daily for 24 weeks. RESULTS: Blinded assessments showed that tazarotene was less likely than vehicle to be associated with an increase in keratinocytic and melanocytic atypia, and more likely than vehicle to be associated with a reduction in atypia. Between-group comparisons in distribution of change from baseline categories of severity were in favour of tazarotene (P = 0.055 for keratinocytic atypia, P = 0.034 for melanocytic atypia, and P < 0.001 for the number of granular cell layers). Compared with vehicle, tazarotene was associated with an increase in epidermal polarity (P = 0.008) and epidermal thickness (P = 0.012), and a tendency for stratum corneum compaction. Tazarotene was also associated with widened intercellular spaces (reported as epidermal oedema) relative to vehicle (P < 0.001). CONCLUSIONS: Treatment of photodamaged skin with tazarotene is associated with an amelioration of keratinocytic and melanocytic atypia, an improvement in epidermal polarity, and an increase in epidermal thickness.     

他扎罗汀和全反式维A酸对热休克后的成纤维细胞表达金属基质蛋白酶及其抑制剂的研究

目的 观察维A酸(他扎罗汀和全反式维A酸)对体外培养的成纤维细胞热休克后,表达基质金属蛋白酶(MMP-1)和基质金属蛋白酶组织抑制因子(TIMP-1)的影响,探讨他扎罗汀和全反式维A酸对热休克后的真皮发生作用的分子生物学机制.方法 体外培养的成纤维细胞在43℃水浴中热休克30 min后,加入不同浓度的维A酸,24 h后应用ELISA法上清液检测MMP-1和TIMP-1表达,并与对照组比较.结果 维A酸类药物作用于热休克后的成纤维细胞,可减少MMP-1,同时增加其抑制剂TIMP-1的含量.其中,他扎罗汀的效果优于全反式维A酸.结论 维A酸类药物对热休克后成纤维细胞产生的,在皮肤老化中有重要作用的MMP-1及其抑制剂TIMP-1有调节作用,可能对修复热休克导致的真皮基质改变有积极作用.     

他扎罗汀凝胶外用联合NB-UVB治疗斑块状寻常型银屑病的疗效观察

目的：观察他扎罗汀凝胶外用联合NB-UVB照射治疗斑块状寻常型银屑病的疗效及安全性。方法：对35例轻、中度患者采用0．05％他扎罗汀凝胶每晚1次外涂配合NB-UVB每周2次照射，共治疗8周，用PASI积分评价疗效。结果：治疗开始1～2周后出现疗效，随着治疗时间的延长。有效率逐渐提高，治疗结束时痊愈率达到94．29％，有效率达100％。6例发生皮肤刺激反应，占17．14％。结论：他扎罗汀凝胶外用联合NB-UVB照射治疗斑块状寻常型银屑病具有良好疗效和安全性。     

Overexpression of p2lWaf1/Cip1 immunohistochemical staining in Bowen's disease, but not in disseminated superficial porokeratosis

Disseminated superficial porokeratosis (DSP) consists of multiple small lesions of porokeratosis. Although the pathogenesis of DSP remains unclear, localized cloning of abnormal epidermis has been hypothesized. Malignant cutaneous neoplasms, especially Bowen's disease, have been frequently reported in DSP. Immunopositive p53 has been demonstrated in a variety of human malignant tumours, and its role in oncogenesis and tumour progression is thought to be important. p21Waf1/Cip1 is thought to mediate the signal of p53 induced by DNA damaging agents to arrest the cell cycle. To clarify the role of p53 and p21Waf1/Cip1 in Bowen's disease and DSP, we analysed 12 cases of Bowen's disease and eight cases of DSP by immunohistochemistry. In five of the 12 Bowen's disease patients and two of the eight DSP patients, positive p53 staining was detected. In contrast, whereas p21Waf1/Cip1 overexpression was detected in all Bowen's disease patients, it was not seen in DSP. The present data suggest that p53 immunostaining provides relevant information concerning the pathogenesis of Bowen's disease and DSP. Furthermore, high p21Waf1/Cip1 expression appears to be a useful indicator of tumour activity in Bowen's disease.     

Tazarotene 0.1% cream versus tretinoin 0.05% emollient cream in the treatment of photodamaged facial skin: a multicenter,double‐blind,randomized, parallel‐group study

OBJECTIVES: To compare the efficacy and tolerability of tazarotene 0.1% cream and tretinoin 0.05% emollient cream in the treatment of photodamaged facial skin.

METHODS: Subjects were eligible to enroll in this multicenter, double‐blind, randomized, parallel‐group study if they had at least mild levels of facial fine wrinkling and mottled hyperpigmentation, and at least moderate levels of one of these. Subjects were randomly assigned to apply either tazarotene cream or tretinoin emollient cream to their faces once each evening for 24 weeks.

RESULTS: A total of 173 subjects were enrolled, of whom 157 completed. All significant between‐group differences in efficacy measures were in favor of tazarotene – for fine wrinkling at the study endpoint and, at earlier timepoints, for treatment success (≥50% global improvement), and the overall integrated assessment of photodamage, mottled hyperpigmentation, and coarse wrinkling. Both products were comparable in terms of cosmetic acceptability and tolerability except that tazarotene was associated with a transiently higher incidence of a burning sensation on the skin (in the first week of treatment but not thereafter).

CONCLUSIONS: Tazarotene 0.1% cream can offer superior efficacy over tretinoin 0.05% emollient cream in the treatment of facial photodamage, particularly with respect to the speed of improvement.     

卤米松与他扎罗汀对角质形成细胞RAR-γ和RXR-α表达的影响

目的 观察不同浓度卤米松和他扎罗汀对体外培养人永生化HaCaT角质形成细胞的维甲酸受体(RAR)-γ和维甲酸X受体(RXR)-α表达的影响,探讨卤米松对他扎罗汀治疗银屑病效应的潜在影响.方法 CCK-8方法检测不同浓度卤米松和他扎罗汀对HaCaT细胞增殖的影响;Western blot法和实时荧光定量PCR(RT-PCR)法检测不同浓度卤米松和他扎罗汀作用12 h、24 h后,HaCaT细胞中RAR-γ和RXR-α的mRNA水平和蛋白水平的变化.结果 卤米松和他扎罗汀均可抑制角质形成细胞增殖.卤米松使HaCaT细胞的RAR-γ和RXR-a mRNA水平和蛋白水平升高.他扎罗汀作用后RAR-γ和RXR-α的mR-NA水平降低,而蛋白水平在12 h升高,24 h降低.结论 卤米松作用角质形成细胞后可上调RAR-γ和RXR-α表达,这可能有助于提高角质形成细胞对他扎罗汀作用的反应性,从而提高他扎罗汀的作用效应.     

Topical retinoids in the treatment of photoaging

A large number of different substances comprise the family of retinoids, which are traditionally described as vitamin A derivatives. By exerting their action through nuclear and cytoplasmic receptors they may improve photoaging. Tretinoin is the best studied retinoid in the treatment of photoaging. Others such as isotretinoin, retinaldehyde, and tazarotene, although less well studied, have given promising results.     

他扎罗汀乳膏与阿达帕林凝胶随机对照治疗寻常型痤疮多中心临床试验

目的 评价国产0．1％他扎罗汀乳膏治疗面部轻中度寻常型痤疮的疗效及安全性。方法 用多中心、随机单盲对照试验方法，0．1％他扎罗汀乳膏或0．1％阿达帕林凝胶局部外用每日1次，疗程8周。在治疗前、治疗2，4和8周进行观察。入选病例142例，其中0．1％他扎罗汀乳膏组71例，完成8周观察64例。0．1％阿达帕林凝胶组71例，完成8周观察67例。结果他扎罗汀乳膏组有效率72．3％，阿达帕林凝胶组有效率62．7％。两组之间无显著统计学差异。两组的不良反应均表现为轻度到中度的局部刺激，发生率分别为28．70％和23．50％。结论 他扎罗汀乳膏治疗寻常型痤疮安全有效。