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.

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.

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.

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.

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。

The Effects of Nanodiamonds at the Action of Colored Metal Ions on the Skin of Guinea Pigs

The protective effect of modified nanodiamonds (MND) under the action of cobalt and nickel ions on the skin of Guinea pigs was shown. At the action of chromium ions on the skin of animals, the protective effect of MND was not found. The differences are related to different adsorption properties of MND to the investigated colored metal ions. It is shown in vitro that MND can adsorb ions of cobalt and nickel and don’t bind ions of chromium from aqueous medium. The perspectives using of MND as a new drug for the prevention allergic dermatitis caused by action of bivalent ions of metals are discussed.

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。

鱼肝油软膏联合地奈德乳膏治疗儿童变应性接触性皮炎疗效及皮肤屏障修复作用研究

目的研究鱼肝油软膏联合地奈德乳膏治疗儿童变应性接触性皮炎(ACD)的疗效及对患儿皮损皮肤屏障的修复效果。方法选取ACD患儿80例随机分为对照组和试验组,每组各40例。对照组给予地奈德乳膏治疗,试验组给予鱼肝油软膏联合地奈德乳膏治疗。治疗2周后,比较两组患儿治疗前后主客观症状评分及皮肤屏障功能指标[角质层含水量、表皮油脂含量及表皮水分丢失量(TEWL)]的变化,以及两组疗效。Spearman相关性分析试验组临床疗效与角质层含水量、表皮油脂含量及TEWL的相关性。结果治疗后,两组局部烧灼感、瘙痒、丘疹、红斑等症状体征评分及水疱数目均较前降低(P<0.01);且试验组上述评分均低于对照组(P<0.05)。两组表皮油脂含量、角质层含水量均较前升高(P<0.05),TEWL则较前降低(P<0.05);且试验组各项皮肤屏障功能指标均优于对照组(P<0.05)。试验组临床疗效高于对照组(92.50%vs.75.00%,P<0.05)。试验组总有效率与表皮油脂含量、角质层含水量呈正相关(r_(s)=0.496,0.438,P<0.05),与TEWL水平呈负相关(r_(s)=-0.483,P<0.05)。结论鱼肝油软膏联合地奈德乳膏治疗儿童ACD,可以有效缓解局部病灶症状,修复损伤皮肤屏障,优于单用地奈德乳膏治疗。

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。

葫芦巴碱调节PI3K/Akt/NF-κB信号通路对变应性接触性皮炎大鼠免疫反应的影响

目的探讨葫芦巴碱对变应性接触性皮炎(ACD)大鼠免疫、炎性反应及PI3K/Akt/NF-κB信号通路的影响。方法60只SD大鼠随机分为正常组、ACD组、葫芦巴碱(低、中、高)剂量组(20、40、80 mg/kg)和PI3K抑制剂(LY294002)组(40 mg/kg),每组10只。除正常组外,其余组大鼠采用2,4二硝基氟苯(DNFB)诱导ACD模型。给药结束后,通过录像观察大鼠挠痒行为;HE染色检测大鼠耳皮肤组织病理学变化;ELISA检测大鼠血清IgE及Th1、Th2、Th17型细胞因子(IFN-γ、IL-4、IL-17)水平;Western blot检测大鼠耳皮肤组织中炎性因子(IL-1β、IL-6)蛋白及PI3K/Akt/NF-κB信号通路相关蛋白表达。结果与正常组比较,ACD组大鼠挠痒次数增加,血清IgE、IFN-γ、IL-4、IL-17水平及耳皮肤组织中IL-1β、IL-6蛋白表达和p-PI3K/PI3K、p-Akt/Akt、p-NF-κB/NF-κB比值升高(P<0.05),耳皮肤组织角化过度且可见大量炎性细胞浸润;与ACD组比较,葫芦巴碱(低、中、高)剂量组和LY294002组大鼠挠痒次数减少,血清IgE、IFN-γ、IL-4、IL-17水平及耳皮肤组织中IL-1β、IL-6蛋白表达和p-PI3K/PI3K、p-Akt/Akt、p-NF-κB/NF-κB比值降低(P<0.05),耳皮肤组织病理损伤均有所改善,且葫芦巴碱各给药组呈剂量依赖效应;葫芦巴碱高剂量组和LY294002组大鼠上述指标比较,差异无统计学意义(P>0.05)。结论葫芦巴碱可抑制ACD大鼠皮肤组织中PI3K/Akt/NF-κB信号通路激活,调控Th1、Th2、Th17型免疫应答并减轻皮肤局部和全身炎性反应。

基于网络药理学和分子对接探讨马齿苋抗变应性接触性皮炎作用机制

目的马齿苋具有抗变应性接触性皮炎的作用,但其作用机制尚不明确,本文基于网络药理学和分子对接探讨马齿苋抗变应性接触性皮炎的作用机制。方法通过TCMSP数据库,筛选出马齿苋的活性成分及靶点,在GeneCards数据库中获取疾病相关靶点,通过Venny 2.1在线平台获得马齿苋与疾病的交集靶点,再利用Cytoscape软件构建药物-活性化合物-靶点-疾病网络,通过String数据库构建蛋白相互作用(PPI)网络,利用Metascape数据库对交集靶点进行富集分析,最后选取关键靶点对关键成分进行分子对接验证。结果研究得到马齿苋活性成分10个,交集基因共有110个,PPI分析得到核心作用靶点有RELA、JUN、TNF等,GO分析富集显示相关生物过程涉及对脂多糖的反应,对细菌起源分子反应等,KEGG富集结果显示马齿苋抗变应性接触性皮炎的主要通路涉及癌症通路、脂质与动脉粥样硬化、TNF等。结论马齿苋抗变应性接触性皮炎具有多成分、多靶点、多通路协同调节的特点,为其后期作用机制研究奠定了基础。

常用清热类中药抗Ⅳ型超敏反应的实验研究

目的:研究常用治疗急性湿疹的清热类中药(生地、黄芩、丹皮、赤芍、白鲜皮、苦参)对小鼠超敏反应的影响,探讨中药的作用机制。方法:使用2,4-二硝基氯苯(DNCB)建立小鼠变应性接触性皮炎(ACD)动物模型,各单味中药灌胃,观察小鼠耳的厚度、重量、外周血的白细胞数,采用ELISA法检测各组小鼠血清中的白细胞介素4(IL-4)、γ-干扰素(IFN-γ)及可溶性白细胞介素2受体(sIL-2R)的含量。结果:生地、黄芩、丹皮、赤芍、白鲜皮、苦参这6味中药在一定程度上均可改善DNCB引起的小鼠耳部肿胀,以黄芩、赤芍、苦参的作用最明显。除苦参外均可明显降低末梢血中白细胞总数的作用。生地、黄芩、丹皮、赤芍、白鲜皮、苦参均显著提高下降的IFN-γ、sIL-2R的水平。生地、丹皮、赤芍、白鲜皮可使IL-4水平降低,黄芩、苦参不能使IL-4水平降低。结论:治疗急性湿疹的清热类中药有抗Ⅳ型超敏反应的作用,作用机理与抑制白细胞总数、调节细胞因子及受体有关。