Study on the therapeutic mechanisms of pseudolaric acid in mice with allergic contact dermatitis

Objective:To study the therapeutic mechanisms of pseudolaric acid on allergic contact dermatitis in mice.Methods:A total of 50 BALB/C mice were selected and randomly divided into control group,model group,and treatment A,B,C groups with 10 rats in each group.ACD model was established in model group,and treatment A,B,C groups but not in control group.Model group received no treatment,but treatment A,B,C groups were treated with external application of the concentration of 0.1%,0.2% and 0.4% of the pseudolaric acid for the lesions of ear skin.And the weight gain and the swelling degree of the mice' ear were recorded,weight of thymus and spleen were measured.Spleen suspension was prepared to test T lymphocyte and B lymphocyte levels of mice in five groups.Changes in serum IFN-ed through the enzyme linked immunosorbent assay(ELISAγ,IL-4 and IL-10 levels were test).Results:The weight gain of mice in model group were significant lower than those of mice in the control group and the treatment A,B,C groups(P<0.05).Weight gain of mice in treatment A,B groups were significant lower than that of control group(P<0.05),but the difference in weight gain between treatment C group and control group showed no significant difference(P>0.05).The swelling degree and the weight of mice ears in model group were significant higher than those of mice in control group and treatment A,B,C groups(P<0.05).Swelling degree and the weight of mice ears of treatment A,B,C groups were obviously higher than that of control group(P<0.05).The swelling degree and weight of mice' ears in treatment A,B,C groups were decreased with the increase of the drug dosage,but comparison between A,B and C group showed statistically differences(P<0.05).The thymus and spleen index of mice in model group were significant higher than those of the other four groups(P<0.05),among the four groups,thymus and spleen index of treatment A and B group were higher than control group and treatment C group(P<0.05).The stimulation index of T and B cells of mice in model group was significantly higher than the rest four groups(P<0.05).The serum IFN-γ level of mice in control group and treatment A,B and C group was obviously lower than that of mice in model group(P<0.05).The serum IFN-γ level of mice in treatment A,B and C group were decreased with the increasing of the drug dosage,and the level of C group was obviously lower than that of A and B group(P<0.05).Conclusion:The pseudolaric acid has anti-inflammation and immune adjustment the effects showing a remarkable therapeutic effects for the ACD mice.

Review of allergic contact dermatitis: Scratching the surface

Contact dermatitis-including allergic contact dermatitis(ACD)-n and results in over four million lost work days per year in the United States alone. ACD is a classic example of a type IV delayed hypersensitivity reaction, and represents a significant burden on the health system, economy, and patient quality of life. Thorough history taking, clinical examination, histologic evaluation, and patch testing are keys to diagnosing contact dermatitis. Patch testing, especially with comprehensive and customized panels based on the patient's exposure history, is particularly useful in identifying potential allergens inthe case of allergic contact dermatitis. ACD management requires a combination of direct medical intervention, patient education, and appropriate environmental modification to prevent exposure to offending allergens in the home or workplace. Continuing advances in the study of ACD has led to an increased understanding of the disease processes, new methods for diagnosis, and improved management. This article reviews ACD-aiming to connect recent investigational data with the current clinical understanding of disease pathophysiology, diagnostic techniques, and management strategies.

Effect of 6＇-acetylpaeoniflorin on dinitrochlorobenzene induced allergic contact dermatitis in BALB/c mice

Aim The present study aimed to investigate anti-inflammatory activity of 6-AP on murine model of aller- gic contact dermatitis （ACD）. Methods 6＇-acetylpaeoniflorin （6-AP） was synthesized from paeoniflorin （Pae） via acetylation and the structure was characterized by 1H-NMR, 13C-NMR and EI-MS. ACD model was established by repeated application of dinitrochlorobenzene （DNCB） to induce skin immune inflammation. The mice were oral- ly administered 6-AP （35, 70, 140 mg. kg-1 ·d^-l）, Pae （70 rag. kg-1·d^-1） and prednisone （Pre, 5 rag. kg^- 1· d^-1 ） from day 1 to day 7 after Cutaneous inflammation was evaluated by ear swelling and histological exami- nation. Splenocyte proliferation was assayed by the 3-（4, 5-dimethylthiazol-2-yl）-2, 5-diphenyl-2H tetrazolium bromide assay. The cytokine production in the splenocytes was measured by enzyme-linked immunosorbent assay. Results Topical application of DNCB to the skin provoked obvious swelling and inflammatory cell infiltration. 6- AP significantly inhibited ear swelling, decreased inflammatory cell infiltration and epidermal keratinization. Ad- dtionally, 6-AP obviously alleviated the hyperplasia of red pulp and germinal center （GC） appearance, decreased spleen index, decreased spleen index, and inhibited splenocyte proliferation in ACD model, compared to that of Pae. Further, the study indicated that 6-AP treatment could increase IL-10 level, while reduce IL-17 level in splenocytes simultaneously. The correlation analysis displayed significantly positive correlations between IL-17 level and the severity of skin inflammation, while negative correlations between IL-10 level and skin inflammation. Con- clusion 6-AP has a significantly higher anti-inflammatory effect than Pae, and it may be a useful treatment for ACD.

Occupational Allergic Contact Dermatitis in Tunisia: Epidemiology and Occupational Outcome

Background: Occupational allergic contact dermatitis (ACD) is one of the most frequent diseases on the workplace worldwide. Its national incidence and prevalence were not previously studied in Tunisia. Objective: To assess incidence of occupational allergic contact dermatitis and its occupational outcome in Tunisia. Methods: Descriptive epidemiological study of all cases of occupational allergic contact dermatitis reported from 2002 to 2012 in Tunisia and recognized by the medical commissions of the National Health Insurance Fund. Results: 315 cases of occupational ACD were collected representing an annual incidence of 31.65 cases/100.000 workers in the private sector in Tunisia. The mean age of our population was 42.70 ± 9.02 years with a male predominance (sex ratio 3.03). The most affected sectors were the clothing sector (14.3% of cases) and the cement industry (13.7% of cases). Patch tests were positive in 188 patients (59.67%). The most frequently positive allergen was potassium dichromate in 27.3% of the cases. Overall, 25.4% of patients had lost their jobs. After multiple binary logistic regression, job loss had a statistically significant relationship with localization of lesions on the face and on dominant hand. Conclusion: Occupational ACD is frequent in Tunisia and is responsible for an important rate of job loss. Preventive measures must be reinforced, especially the wearing of protective gloves.

Allergic Contact Dermatitis from Diethyl Sebacate in a Topical Antimycotic Medicament

Diethyl sebacate is used in topical medicaments in United States and Japan. We described a case of allergic contact dermatitis from diethyl sebacate in a topical antimycotic medicament. Allergic reaction to diethyl sebacate is likely more common because our group has found three of eight sensitized cases. We believe that an investigation regarding the sensitized frequency to diethyl sebacate would conduct to improve the safety of products in United States and Japan.

Allergic Contact Dermatitis Syndrome Due to Tocopherol Acetate, in Addition to Glycyrrhetinic Acid

Natural vitamin E is suggested to have an antioxidant function. However, the synthetic form of vitamin E, DL-tocopherol, which has been widely used in topical ointments, may cause allergic contact dermatitis. Here, we report a case of allergic contact dermatitis with erythema multiforme-like eruption caused by a topical ointment. Patch testing indicated a positive allergic reaction to an anti-inflammatory ointment the patient had been using and its ingredient, DL-alpha-tocopheryl acetate (vitamin E). In addition, a positive reaction to glycyrrhetinic acid was observed. Both vitamin E and glycyrrhetinic acid are useful ingredients of topical applications. However, the possibility that both can cause contact dermatitis, albeit rarely, should be considered.

Follicular contact dermatitis revisited: A review emphasizing neomycin-associated follicular contact dermatitis

Follicular contact dermatitis clinically presents as individual papules that include a central hair follicle. Pathologic features involve the follicle and the surrounding dermis: spongiosis and vesicle formation of the follicular epithelium associated with perifollicular and perivascular lymphocytic inflammation. Using the Pub Med database, an extensive literature search was performed on follicular contact dermatitis and neomycin. Relevant papers were reviewed and the clinical and pathologic features, the associated chemicals(including a more detailed description of neomycin), the hypothesized pathogenesis, and the management of follicular contact dermatitis were described. Several agentseither as allergens or irritants-have been reported to elicit follicular contact dermatitis. Several hypotheses have been suggested for the selective involvement of the follicles in follicular contact dermatitis: patient allergenicity, characteristics of the agent, vehicle containing the agent, application of the agent, and external factors. The differential diagnosis of follicular contact dermatitis includes not only recurrent infundibulofolliculitis, but also drug eruption, mite infestation, viral infection, and dermatoses that affect hair follicles. The primary therapeutic intervention for follicular contact dermatitis is withdrawal of the causative agent; treatment with a topical corticosteroid preparation may also promote resolution of the dermatitis. In conclusion, follicular contact dermatitis may be secondary to allergens or irritants; topical antibiotics, including neomycin, may cause this condition. Several factors may account for the selective involvement of the hair follicle in this condition. Treatment of the dermatitis requires withdrawal of the associated topical agent; in addition, topical corticosteroids may be helpful to promote resolution of lesions.

Pathogenesis and diagnosis of contact dermatitis:Applications of reflectance confocal microscopy

Contact dermatitis(CD) is the most common professional skin disease, with frequencies ranging from 24 to 170 every 100000 individuals. Approximately 20% of the United States population suffers from CD. CD can be classified according to its origin and severity. ICD stands for irritant CD, whereas ACD means allergic CD. Their clinical presentation includes acute, sub-acute and chronic eczema. Despite their different origin, ICD and ACD often present similar clinical and histologic findings. The current gold standard for diagnosis is patchtesting. However, patch-testing is being questioned in terms of validity and reproducibility, as it relies heavily on the skill of the observer. Real-time reflectance confocal microscopy is a non-invasive imaging technique that bears strong promise for the study of CD, and it enables the evaluation of cellular and subcellular changes over time with similar resolution compared to that of conventional histology.

Deficiency of Autophagy-Related Gene 5 in Keratinocytes Leads to Aggravation of Epidermal Damage in 2,4-Dinitrochlorobenzene-Induced Allergic Contact Dermatitis

Objective:The interrelationship between apoptosis and autophagy plays an important role in many pathophysiological processes,however,whether their interplay is involved in allergic contact dermatitis(ACD)has not yet been elucidated.So,we conducted this study to determine whether keratinocyte-specific autophagy-related gene 5(ATG5)deficiency can regulate apoptosis to inhibit skin damage in mice with 2,4-dinitrochlorobenzene(DNCB)-induced ACD.Methods:This study involved keratinocyte-specificAtg5 conditional knockout(cKO)mice(Krt14cre/+-Atg5flox/flox)and control mice(Krt14+/+-Atg5flox/flox).We painted DNCB on the right ear of each mouse to induce ACD.Dermatitis scoring and measurements of ear weight and thickness were performed to evaluate inflammation levels.An immunohistochemical assay was performed to analyze immune cell infiltration.Histological study and TUNEL staining were performed to compare the differences in skin lesions betweenAtg5 cKO mice and control mice.Immunofluorescence and western blotting were used to examine the levels of ATG5 and apoptosis-related protein.The results were statistically analyzed byt test.Results:After DNCB stimulation of mice ears,we observed a more severe phenotype inAtg5 cKO mice than in control mice(dermatitis score:7.500±2.588vs.3.250±0.822,P=0.003).Further analysis of ATG5 protein confirmed keratinocyte-specific ablation ofAtg5 in cKO mice and showed that DNCB did not influence ATG5 expression.Immunohistochemistry assay revealed that the infiltrated immune cells were not involved in aggravation of the phenotype of DNCB-stimulatedAtg5 cKO mice.However,the histological study(P=0.024),TUNEL staining(P=0.024),immunofluorescence(P=0.036),and western blotting showed that the increase in keratinocyte death,especially apoptosis,contributed to aggravation of the phenotype of DNCB-stimulatedAtg5 cKO mice.Conclusion:Deficiency ofAtg5 in keratinocytes increases apoptosis,aggravating skin damage in DNCB-induced ACD mice.This has no relationship with the involvement of immune cells.

Analysis of nickel distribution by synchrotron radiation X-ray fluorescence in nickel-induced early- and late-phase allergic contact dermatitis in Hartley guinea pigs

Background: Nickel-induced allergic contact dermatitis (Ni-ACD) is a global health problem. More detailed knowledge on the skin uptake of haptens is required. This study aimed to investigate the penetration process and distribution of nickel in skin tissues with late phase and early phase of Ni-ACD to understand the mechanisms of metal allergy. Methods: Forty Hartley guinea pigs were divided into four groups according to the NiSO4 sensitizing concentration and the NiSO4 challenged concentration: the 5% NiSO4-group, 5% to 10%(sensitization-challenge;late phase group);10% NiSO4-group, 10% to 10%(sensitization-challenge;early-phase group);and the positive and negative controls. Pathological biopsies were performed on each group. The depth profile of nickel element concentration in the skin of guinea pigs was detected by synchrotron radiation micro X-ray fluorescence spectroscopy (SR-μ-XRF) and micro X-ray absorption near-edge spectroscopy (μ-XANES). Results: In each section, the nickel element concentration in both the 5% NiSO4-group and 10% NiSO4-group was significantly higher than that in the negative control group. In the upper 300-μm section of skin for the early phase group, the nickel element concentration was significantly higher than that in the lower section of skin. In deeper sections (>200 μm) of skin, the concentration of nickel in the early phase group was approximately equal to that in the late phase group. The curve of the late phase group was flat, which means that the nickel element concentration was distributed uniformly by SR-μ-XRF. According to the XANES data for the 10% NiSO4 metal salt solution, structural changes occurred in the skin model sample, indicating that nickel was not present in the Ni^2+ aqueous ionic state but in the nickel-binding protein. Conclusions: This study showed that the distribution of the nickel element concentration in ACD skin tissue was different between the early phase and late phase groups. The nickel element was not present in the Ni^2+ aqueous ionic state but bound with certain proteins to form a complex in the stratum corneum in ACD model tissue.

Qualitative and quantitative analysis of Arnebiae Radix and Dictamni Cortex and efficacy study of herbal extracts on allergic contact dermatitis using 3D human reconstructed epidermis

Objective:To evaluate the quality of Arnebiae Radix(AR)and Dictamni Cortex(DC)and study the efficacy of herbal extracts of these two herbs on the treatment of allergic contact dermatitis(ACD).Methods:Qualitative and quantitative analysis of effective components was performed using High Performance Thin Layer Chromatography(HPTLC),High Performance Liquid Chromatography(HPLC),and HPLC-Quadrupole Time of Flight-Mass Spectrometry(HPLC-QTOF-MS).In vitro allergic ACD 3D model was established by incubating 3D reconstructed human epidermis(RHE)with skin sensitizer,potassium dichromate.A total of 65 gene expression that were associated with ACD,which included 24 antioxidant responsive element(ARE)and 41 SENS-IS genes were quantified by q RT-PCR.More than or equal to 10 ARE genes and 18 SENN-IS genes were induced by 1.3-fold,demonstrating the successful establishment of in vitro ACD model.Oil extracts of AR and DC were applied on the in vitro ACD model to study the efficacy.Results:Batch 3 of AR and batch 2 of DC showed presence of all active ingredients with the highest concentrations.Active ingredients of the herbs were extracted using a special oil and formulated into herbal oil extracts.The herbal oil extracts were able to down regulate the induced genes in the in-vitro ACD skin model,bringing the tissue back to homeostatic status.Conclusion:The oil extracts showed the potent efficacy of using AR and DC in ACD treatment.The combination study will be done to optimize the formulation ratio which will be developed into a topical cream.

基于生物信息学分析筛选镍变应性接触性皮炎的关键基因

目的利用生物信息学方法分析镍变应性接触性皮炎(Ni-ACD)皮损与正常皮肤的差异基因,筛选关键基因,并进行治疗药物预测。方法由基因表达数据库(GEO)检索得到GSE60028及GSE168735数据集,采用R语言对数据进行校正、筛选差异表达基因、基因本体(GO)功能分析和京都基因与基因组百科全书数据库(KEGG)通路富集分析,并对2个数据集交集的差异基因进行蛋白-蛋白相互作用(PPI)分析,通过Cytoscape分析得到关键基因,将12个关键基因输入Connectivity Map(CMap)中预测治疗Ni-ACD的潜在化合物。结果本研究筛选获得GSE60028和GSE168735数据集交集差异表达基因417个,关键基因MX1、ISG15、IRF7、XAF1、BST2、IRF1、IFI35、OAS2、RSAD2、IFIT3、ISG20和OASL共12个。GO及KEGG分析结果表明,差异表达基因主要参与白细胞的细胞-细胞黏附、细胞因子介导的信号通路、白细胞迁移、T细胞激活的调节和白细胞的细胞-细胞黏附的调节等生物过程,主要富集在细胞因子及免疫相关通路上。预测得到10种化合物,可能对Ni-ACD具有潜在的治疗作用。结论本研究基于生物信息学方法筛选Ni-ACD关键基因,并预测潜在的治疗药物,为临床及药物研究提供参考。

养血消风饮对慢性ACD小鼠淋巴细胞凋亡及其相关细胞因子影响的实验研究

目的:进行养血消风饮的药效学研究,从淋巴细胞凋亡及其相关细胞因子的角度进行其免疫学机制探讨。方法:用二硝基氯苯建立小鼠耳廓慢性ACD模型,随机分为4组:空白组、模型组、中药组、西药对照组,采用免疫组化的方法,检测慢性ACD模型小鼠病变组织中细胞因子TNF-α、NF-κBp50、Fas/FasL含量,同时取小鼠脾组织冲洗液,用Annexin V-FITC细胞凋亡检测方法,用流式细胞仪检测不同组间淋巴细胞早期凋亡的百分率,并进行其与Fas/FasL含量的相关分析。通过对小鼠慢性ACD发病过程中皮损部位上述细胞因子表达的变化、脾淋巴细胞早期凋亡百分率及其相关性进行研究,探求养血消风饮可能的作用机制和环节。从细胞水平探索养血消风饮能否通过诱导淋巴细胞凋亡下调免疫应答强度,进而抑制ACD的发生。结果:养血消风饮可明显下调慢性ACD小鼠病变皮肤组织中TNF-α、NF-κBp50的表达水平,并明显上调Fas和FasL的表达,且二者分别呈正相关。同时,ACD小鼠的脾淋巴细胞早期凋亡的百分率较模型组明显增加,且与小鼠耳组织Fas、FasL的表达分别呈正相关。中药组脾淋巴细胞凋亡百分率优于西药对照组。结论:养血消风饮可明显下调慢性ACD小鼠病变皮肤组织中TNF-α、NF-κBp50的表达水平,可能在转录水平抑制炎症的发生,抑制免疫反应;同时,可明显上调其病变皮肤组织中Fas和FasL的表达,促进小鼠脾淋巴细胞凋亡。

基于“复气”理论论治过敏性皮炎

[目的]基于“复气”理论探讨过敏性皮炎病机及治法。[方法]查阅古籍及文献,论述“复气”理论内涵,结合过敏性皮炎发病特点,从“复气”理论深入分析过敏性皮炎病机与治法,并附病案佐证之。[结果]过敏性皮炎属中医学中“漆疮”“桃花癣”等范畴,常于春、秋季节加重或发病,并易复发。“复气”是自然界中五行之间保持阴阳平衡的一种方式,也是一种人体调节五行平衡的机制。受《素问·气交变大论》“复气”理论的启发,结合过敏性皮炎临床特点及春、秋季节气候特点探讨其病机及治疗方法,认为其核心病机为“脾土不及,易感外邪;肝风助发,来势急骤;金气来复,燥热相兼”,并提出“培土疏肝,清金润燥”的治疗原则。基于此及大量临床实践,自拟制复润燥消红方并收效甚好。文中病案,辨为脾虚肝旺证,治以健脾疏肝、润燥消红,方拟制复润燥消红方,随证加减,疗效显著。[结论]基于“复气”理论论治过敏性皮炎,本质在于调节五行之间的平衡,制复润燥消红方临床应用疗效确切并可防其复发,为过敏性皮炎提供了一种有所裨益的辨治新思路。

不同加工方式的油茶籽油对变应性接触性皮炎的抗炎效果

为了明确不同加工方式的油茶籽油对变应性接触性皮炎(ACD)的治疗效果,并探究油茶籽油中的主要抗炎物质,分别制备低温压榨油茶籽油、热榨油茶籽原油、热榨精炼油茶籽油、土榨油茶籽油和超临界CO_(2)油茶籽油,分析不同加工方式及添加不同活性物质的油茶籽油对ACD模型小鼠耳廓肿胀的影响,并结合ELISA法、HE染色和免疫组化探究其对小鼠炎症的抑制效果。结果表明:超临界CO_(2)油茶籽油对ACD小鼠耳廓肿胀的抑制率最高,与阳性对照组相比其小鼠血清中炎症因子TNF-α、IL-1β和IL-6含量降低率超过10%,炎症细胞浸润程度明显好转,耳廓肿胀组织中NF-κB阳性表达量与阴性对照组相比无显著差异;预防性给药的抗炎效果普遍低于造模后给药;倍数添加角鲨烯和生育酚的油茶籽油对ACD小鼠耳廓肿胀的抑制率显著提高,在50%左右,且角鲨烯、生育酚处理组小鼠耳廓组织中NF-κB阳性表达量与阴性对照组无显著差异。因此,外用超临界CO_(2)萃取的油茶籽油治疗小鼠ACD效果最佳,其抗炎效果并非源于单一活性成分,与角鲨烯和生育酚等活性成分均密切相关。

中医药治疗变应性接触性皮炎的研究概况

变应性接触性皮炎是一种由皮肤接触变应原而导致的炎症性皮肤病,患病人群广,严重影响患者的身心健康。由于变应性接触性皮炎发病病因复杂、病情反复发作性、症状重且无特效治疗方法。因此文章对变应性接触性皮炎的病因病机、中医药治疗变应性接触性皮炎的方法及作用机制进行归纳与总结。治疗变应性接触性皮炎的中医药方法包括单味中药、中药单体成分、中药内服复方制剂、中药外用复方制剂、中医药特色疗法及中医药联合疗法等,其作用机制主要是抑制炎症反应,调节免疫平衡,降低机体氧化应激、调控相关通路及蛋白表达等。

脂肪移植治疗DNCB诱导ACD模型小鼠的实验研究

目的探究脂肪移植治疗2,4-二硝基氯苯(DNCB)诱导变应性接触性皮炎(allergic contact dermatitis,ACD)模型小鼠的效果及其可能机制。方法采用DNCB复制ACD小鼠模型,随机分成A(脂肪移植治疗组)、B(假手术治疗组)、C(药物治疗组)、D组(自然修复组),观察脂肪移植对ACD小鼠的治疗效果。2周后处死小鼠,取背部皮损处全层皮肤组织,苏木精-伊红染色法染色观察各组小鼠皮肤组织病理改变;实时荧光定量聚合酶链反应(q RT-PCR)检测皮损中白介素10(IL-10)、白介素17(IL-17)、干扰素-γ(IFN-γ)的表达。结果 A、C组可以观察到表皮厚度恢复正常,角质层变薄;B、D组无明显改变。RT-PCR检测发现A、C组皮肤组织中IL-10和IL-17 m RNA水平低于D组,IFN-γm RNA较D组升高(P<0.05),而B与D组比较差异无统计学意义(P>0.05)。结论脂肪移植可降低皮损中IL-10和IL-17的表达,促进IFN-γ产生,减轻皮损炎症。

医用臭氧油通过抑制FcεRI/Syk信号通路缓解DNCB诱导的变应性接触性皮炎

目的:臭氧被广泛用于治疗过敏性皮肤病,如湿疹、特应性皮炎和接触性皮炎。然而其具体的机制仍然不清楚。本研究旨在探讨医用臭氧油对2,4-二硝基氯苯(2,4-dinitrochlorobenzene,DNCB)诱导的变应性接触性皮炎(allergic contact dermatitis,ACD)的治疗作用及其机制。方法:除空白对照组外,其余小鼠均用DNCB处理。采用DNCB建立ACD样小鼠模型,随机分为模型组、基础油组、医用臭氧油组、FcεRI过表达质粒(FcεRI-OE)组和FcεRI空质粒(FcεRI-NC)组;基础油和医用臭氧油组分别采用同等剂量基础油和医用臭氧油进行处理,FcεRI-OE组和FcεRI-NC组分别皮内注射25μg FcεRI过表达质粒和空质粒。记录皮损每日的变化,并使用反射共聚焦显微镜(reflectance confocal microscope,RCM)评估皮损厚度和炎症改变,同时对皮损组织进行苏木精-伊红(hematoxylineosin,HE)染色、实时聚合酶链反应(real-time PCR)、RNA测序(RNA-sequencing,RNA-seq)和免疫组织化学的检测及分析。结果:医用臭氧油显著减轻了DNCB诱导的ACD样皮炎,并降低了IFN-γ、IL-17A、IL-1β、TNF-α和其他相关炎症因子的表达(均P<0.05)。RNA-seq分析显示医用臭氧油显著抑制了DNCB诱导的FcεRI/Syk信号通路的激活,后续通过real-time PCR和免疫组织化学方法得到证实(均P<0.05)。与臭氧油组和FcεRI-NC组相比,FcεRI-OE组的IFN-γ、IL-17A、IL-1β、IL-6、TNF-α和其他炎症基因的mRNA表达水平明显升高(均P<0.05),FcεRI-OE组FcεRI和Syk的mRNA和蛋白质表达水平也明显升高(均P<0.05)。结论:医用臭氧油通过抑制FcεRI/Syk信号通路显著改善ACD样皮炎,减轻DNCB诱导的ACD样皮炎。

化妆品中过敏原成分研究概况

通过介绍化妆品中过敏原致敏的反应机制和致敏后的皮肤表现,归纳了化妆品中常见的几种过敏原,结合各国的相关法规,综述了常见化妆品过敏原的临床诊断、毒理学检测和理化检测方法,并对如何降低化妆品过敏事件的发生提出了建议。

变应性接触性皮炎发病机制及中西医治疗研究进展

变应性接触性皮炎(ACD)是一种常见的炎症性皮肤病,属中医“漆疮”范畴。现代医学认为,影响ACD的发病因素包括遗传、环境及生活方式、特应性病史及皮肤屏障功能受损,其发病机制涉及机体免疫失调、炎症反应、氧化应激以及神经传导等。西医治疗ACD多采取糖皮质激素、类固醇及免疫抑制剂为主,还涉及热疗法、光疗法等。中医药治疗有口服给药、外用给药及针灸疗法等,能从免疫调节、抑制炎症反应、抗氧化、降低神经传导等多种途径达到治疗效果,且较西医治疗具有低复发率、高疗效的特点。论述ACD的发病机制、影响因素以及治疗方法,为防治ACD提供理论依据。