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.

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.

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.

消敏合剂对慢性变应性接触性皮炎小鼠病变组织ICAM-1、NF-κB含量影响随机平行对照研究

[目的]观察消敏合剂对慢性变应性接触性皮炎小鼠病变组织ICAM-1、NF-κB含量影响。[方法]使用随机平行对照方法,将50只健康昆明种小鼠编号按随机数字标法分为5组,10只/组(空白对照组、模型组、消敏合剂组、氯雷他定组、消风止痒颗粒组)。使用2,4-二硝基氯苯(DNCB)诱导小鼠变应性接触性皮炎(ACD)模型。造模前1d开始灌胃干预,0.4mL/次,1次/d,直至末次激发后6h行最后一次灌胃;空白对照组、ACD模型组生理盐水;其他各组以体表面积折算,按每天成人用药等效剂量4倍浓度分别消敏合剂、氯雷他定、消风止痒颗粒灌胃干预。采用ELISA法测定血清ICAM-1、NF-κB水平。[结果]外周血白细胞计数消敏合剂组、氯雷他定组、消风止痒颗粒组均显著降低(P<0.01),模型组明显高于空白对照组(P<0.01),消风止痒颗粒组与消敏合剂均高于氯雷他定组(P<0.01)。病变组织ICAM-1、NF-κB含量各组均明显高于空白对照组(P<0.01),各干预组均显著低于模型组(P<0.01),消敏合剂组明显低于消风止痒颗粒组(P<0.01),消风止痒颗粒组高于氯雷他定组(P<0.01)。ICAM-1表达空白对照组表皮内阳性表达不明显,真皮层细胞内仅见包浆内有少量或散在的棕染颗粒,染色较浅,模型组见表皮、表皮细胞强阳性表达,胞浆内含有大量棕染颗粒,颜色较深,消敏合剂组、氯雷他定组和消风止痒颗粒组均可见不同程度的阳性棕染颗粒,但与模型组比较表达数量较少,可见散在胞浆内棕染颗粒。NF-κB表达空白对照组表皮内阳性表达不明显,真皮层细胞内仅见包浆内有少量或散在棕染颗粒,染色较浅;模型组见表皮、表皮细胞强阳性表达,胞浆内含有大量棕染颗粒,颜色较深;消敏合剂组、氯雷他定组和消风止痒颗粒组均可见不同程度阳性棕染颗粒,与模型组比较表达数量较少,可见散在胞浆内棕染颗粒。[结论]消敏合剂能调节ICAM-1、NF-κB细胞因子表达,对DNCB诱导慢性变态性接触性皮炎炎症反应有抑制作用。

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。

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。

喘可治注射液抑制小鼠变应性接触性皮炎的实验研究

目的:探讨中药喘可治注射液抑制小鼠变应性接触性皮炎(Ⅳ型变态反应)的效果。方法:将小鼠按给药不同分为喘可治注射液高、中,低剂量组,地塞米松(DEX)组,苯海拉明及生理盐水组,利用2 ,4 -二硝基氟苯诱发的小鼠左耳变应性接触性皮炎的动物模型,各组于第0d、1d致敏前2h ,第2d和第5d诱发前2h及诱发后6h腹腔注射给药,通过测量左耳厚度差、左耳重量差,体重差及观察左耳病理改变,比较不同剂量喘可治注射液之间以及与对照组之间的疗效。结果:喘可治注射液高、中、低剂量和DEX组小鼠左耳厚度及重量的增加,浸润的单核细胞和中性粒细胞的数量均明显低于生理盐水组(P <0 . 0 1) ;DEX组小鼠左耳红肿的程度虽稍低于喘可治组,但小鼠体重差与其它组比较均有显著差异(P <0 . 0 1) ;苯海拉明组小鼠变应性接触性皮炎的程度与生理盐水组差异无显著。结论:喘可治注射液具有明显抑制小鼠变应性接触性皮炎的作用。

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。

氧化苦参碱抑制二硝基氟苯所致小鼠接触性皮炎及淋巴细胞增殖

目的探讨氧化苦参碱(OMT)对二硝基氟苯(DNFB)所致小鼠变应性接触性皮炎(ACD)的抑制作用及小鼠淋巴细胞增殖的影响。方法①建立DNFB所致小鼠ACD模型,以不同剂量的OMT、PBS、氢化可的松(HCT)进行腹腔注射,检测小鼠耳廓肿胀度变化。②利用羧基荧光素乙酰乙酸(CFDA-SE)染色,流式细胞术检测OMT对小鼠淋巴细胞增殖的影响。结果①OMT对DNFB所致小鼠ACD呈剂量依赖性抑制作用,且与同等剂量HCT作用效果相似,但副作用明显减小。②体外实验证明,在500、125和31mg/L组,OMT对小鼠淋巴细胞增殖呈剂量依赖性抑制。结论OMT对DNFB所致小鼠ACD有显著的抑制作用,而且抑制小鼠淋巴细胞增殖;OMT是一种免疫抑制剂。

皮炎洗剂对小鼠慢性变应性接触性皮炎的影响及其作用机制

目的评价皮炎洗剂治疗小鼠慢性变应性接触性皮炎(ACD)的疗效。方法采用2,4-二硝基氯苯(DNCB)诱导小鼠背部ACD。60只小鼠随机分为空白对照组、ACD组、阳性组、皮炎洗剂大剂量组(0.4g/mL)、中剂量组(0.2g/mL)、小剂量组(0.1g/mL),每组10只,于致敏后给药,观察各组小鼠第4次激发24h后皮损炎症程度、组织病理切片、炎症细胞数量改变及血清中IFN-和IL-4水平的变化。结果皮炎洗剂中、大剂量能有效减轻ACD小鼠引起的免疫器官肿大、皮损炎症程度,减少皮损组织炎症细胞数量,调节ACD组小鼠血清中-干扰素(IFN-)和白细胞介素-4(IL-4)水平。结论皮炎洗剂对小鼠ACD具有明显的治疗作用,其作用机制可能与皮炎洗剂调节Th1、Th2型细胞因子有关。