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  • 1
    Online Resource
    Online Resource
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Keywords: Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (257 pages)
    Edition: 1st ed.
    ISBN: 9783662088432
    Series Statement: Hochschultext Series
    Language: German
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  • 2
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background Staphylococcus aureus is a well known trigger factor of atopic dermatitis (AD). Besides the superantigens, further exotoxins are produced by S. aureus and may have an influence on the eczema.Objective To explore the impact of staphylococcal α-toxin on human T cells, as those represent the majority of skin infiltrating cells in AD.Methods Adult patients with AD were screened for cutaneous colonization with α-toxin producing S. aureus. As α-toxin may induce necrosis, CD4+ T cells were incubated with sublytic α-toxin concentrations. Proliferation and up-regulation of IFN-γ on the mRNA and the protein level were assessed. The induction of t-bet translocation in CD4+ T cells was detected with the Electrophoretic Mobility Shift Assay.Results Thirty-four percent of the patients were colonized with α-toxin producing S. aureus and α-toxin was detected in lesional skin of these patients by immunohistochemistry. Sublytic α-toxin concentrations induced a marked proliferation of isolated CD4+ T cells. Microarray analysis indicated that α-toxin induced particularly high amounts of IFN-γ transcripts. Up-regulation of IFN-γ was confirmed both on the mRNA and the protein level. Stimulation of CD4+ T cells with α-toxin resulted in DNA binding of t-bet, known as a key transcription factor involved into primary T helper type 1 (Th1) commitment.Conclusion α-toxin is produced by S. aureus isolated from patients with AD. We show here for the first time that sublytic α-toxin concentrations activate T cells in the absence of antigen-presenting cells. Our results indicate that α-toxin is relevant for the induction of a Th1 like cytokine response. In AD, this facilitates the development of Th1 cell dominated chronic eczema.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Clinical & experimental allergy 34 (2004), S. 0 
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background Food allergy is a common problem in patients with atopic dermatitis (AD), particularly in children. While immediate reactions to food are well characterized, the importance of food as a provocation factor for late eczematous reactions has been a subject of debate for several decades.Objective To investigate the importance of food for the induction of late eczematous reactions in children with AD and to correlate the clinical outcome to the results of specific IgE determinations and atopy patch tests (APTs).Methods One hundred and six double-blind placebo-controlled food challenges (DBPCFCs) to cow's milk, hen's egg, wheat and soy in 64 children with AD (median age 2 years) were analysed retrospectively. Total and food-specific IgE were determined by CAP RAST FEIA and APTs with native foodstuff were performed. The diagnostic values of specific IgE and APT results were calculated.Results Forty-nine (46%) of the challenges were related to a clinical reaction. An exacerbation of AD (late eczematous reaction) commonly occurred 24 h after the ingestion of food. Isolated late eczematous reactions were seen in 12% of all positive challenges. Forty-five percent of the positive challenges were associated with late eczematous responses, which followed immediate-type reactions. The sensitivity of food-specific IgE and the APT was 76% and 70%, respectively. Specific IgE and APT were often false positive, which resulted in low positive predictive values (64% and 45%, respectively).Conclusions Late eczematous reactions may often be observed upon food challenge in children with AD. Due to the poor reliability of food-specific IgE and APT results DBPCFCs have still to be regarded as the gold standard for the appropriate diagnosis of food responsive eczema in children with AD.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 26 (1996), S. 0 
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background Bovine casein leads to an expansion of lymphocytes expressing the cutaneous lymphocyte antigen and to specific lymphocyte proliferation in a subgroup of patients with milk-responsive atopic dermatitis (AD). The casein fraction is composed of different proteins with defined and completely different sequences.Objective To define the stimulatory capacity of the major casein protein (α and k) in lymphocyte proliferation assays with cells from milk-allergic and non-allergic individuals.Methods Proliferative responses of peripheral blood mononuclear cells to lipopolysaccharide-depleted casein subfractions were measured by thymidine incorporation. Lymphocytes from milk-responsive patients with AD were compared with cells from non-responsive patients with AD and to non-atopic individuals, Atopic individuals with immediate symptoms following consumption of cow's milk were included as positive controls. Casein-specific T-cell clones (TCC) from four patients with milk-responsive AD were restimulated with unfractioned casein and K-casein.Results Higher proliferative responses to unfractionated casein and α-,β and casein were observed in milk-responsive patients compared with non-responders. Unfractionated casein and K-casein discriminated best between the milk-responsive patients with AD and non-responders. Twenty-five of 31 TCC from patients with milkresponsive AD reacted to the mixed casein preparation and K-casein.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background and aim Atopic dermatitis (AD) is a common chronic inflammatory skin disease often accompanied by cutaneous Staphylococcus aureus colonization and, in this regard, especially complicated by the presence of superantigen-producing strains. Because IgG antibodies comprise an important defence mechanism of the adaptive immune system against bacteria, it was investigated whether AD patients have an abnormal pattern or distribution of superantigen-specific IgG subclass antibodies in association with disease severity and activity.Methods Staphylococcal enterotoxin B (SEB) and staphylococcal enterotoxin C1 (SEC1) specific IgG antibody subclasses were assessed in n=89 adult AD patients with mild to severe disease activity as determined by the SCORAD score and in n=28 healthy age-matched controls. Results were correlated with the current status of bacterial skin colonization and severity score.Results Thirty-eight per cent of the AD patients showed a selective deficiency in IgG2 antibodies against SEC1 compared with only 14% in the control group. The absence of these antibodies was found in both currently colonized and non-colonized AD patients and was associated with a severe phenotype (SCORAD more than 40 points in two-thirds of the deficient patients). However, these patients had normal production levels of IgG2 antibodies against pneumococcal capsular polysaccharide (PCP) and SEB, but higher IgG1 and IgG4 titres against SEC1. Except for elevated total IgG1, total IgG subclass levels were normal in this AD subgroup. Yet, peripheral blood mononuclear cells (PBMCs) derived from these patients clearly produced IL-4 and IL-5 upon SEC1 re-stimulation whereas PBMCs from those providing SEC1-specific IgG2 antibodies failed in the production of these cytokines.Conclusion A subgroup of AD patients suffers from a selective deficiency to produce anti-SEC1 IgG2 antibodies. This patient group is characterized by a severe AD phenotype.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Aims:  Sentinel lymph node biopsy is an increasingly established procedure in the primary staging of high-risk melanoma patients. However, the laboratory evaluation of sentinel lymph node biopsies is a matter of controversy. The aim of this study was to determine the specificity of polymerase chain reaction (PCR) techniques for the evaluation of lymph nodes with regard to melanoma metastases in comparison with histology and immunohistology.Methods and results:  Sentinel lymph nodes (n = 41) from 29 melanoma patients and 29 lymph nodes from 27 patients without melanoma were analysed by histology (H&E) and immunohistology (Melan A, HMB45). cDNA of these lymph nodes was subjected to LightCycler PCR amplification using primers specific for tyrosinase and HMB45. Two melanoma sentinel lymph nodes contained naevus cells by histology and immunohistology and were therefore excluded from further evaluation. Eight (20.5%) of the remaining 39 melanoma sentinel lymph nodes were positive by histology and immunohistology and tyrosinase PCR, 15.4% (6/39) were positive only by tyrosinase PCR, 2.6% (1/39) were positive only by histology and immunohistology. HMB45 PCR revealed positive results in 7.7% (3/39) sentinel lymph nodes, which were also positive by tyrosinase PCR and histology and immunohistology. Of non-melanoma lymph nodes 13.8% (4/29) and 14.8% (4/27) of non-melanoma patients were positive by tyrosinase PCR but negative by histology and immunohistology and HMB45 PCR. Thus, tyrosinase PCR had a specificity of only 85.2%.Conclusions:  The specificity of tyrosinase PCR and the sensitivity of HMB45 PCR are too low to recommend these PCR examinations for the guidance of therapy, in particular complete regional lymph node dissection.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    British journal of dermatology 153 (2005), S. 0 
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    British journal of dermatology 152 (2005), S. 0 
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background  Noninfectious granulomatous skin diseases are inflammatory disorders of unknown aetiology which are often recalcitrant to common anti-inflammatory treatment regimens. Recently, in several case reports, fumaric acid esters (FAE) have proved beneficial in granulomatous skin diseases, but studies on a larger collection of consecutive patients have not yet been performed.Objectives  To investigate the therapeutic efficacy of FAE for the treatment of granulomatous skin diseases.Patients and methods  The therapeutic efficacy and side-effects of FAE were analysed retrospectively in 32 patients with disseminated granuloma annulare (n = 13), annular elastolytic giant cell granuloma (n = 3), sarcoidosis (n = 11), necrobiosis lipoidica (n = 4), or granulomatous cheilitis (n = 1).Results  Three patients discontinued treatment within 4 weeks because of side-effects. Of the remaining 29 patients, 18 patients responded to treatment with FAE. Marked improvement or complete clearance was seen in seven patients. We observed a slight to moderate improvement in 11 patients, and 11 patients did not respond. In patients showing a complete remission, the maximum effect was observed after 8·5 months (SD ±6 months, range 3–20 months). In two patients with systemic sarcoidosis, the pulmonary changes improved in parallel with the skin. Side-effects were usually mild and resolved spontaneously upon dose reduction or discontinuation of the therapy.Conclusions  The data presented here indicate that FAE may be considered for the treatment of recalcitrant granulomatous skin disease.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 135 (1996), S. 0 
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In this study we evaluated antigen-specific in vitro responses of peripheral blood lymphocytes to lipopoiysaccharide (LPS)-depleted food allergens in children who reacted to food challenge (cow's milk or hen's egg) with a deterioration of their atopic dermatitis (AD). Some ofthe children showed immediate symptoms (urticaria, bronchial asthma or gastrointestinal symptoms) as well. The proliferation of casein-stimulated lymphocytes from children reacting to cow's milk (age (0.7–5.9 years) was significantly higher (P〈0.01) than the proliferation of lymphocytes from 15 children with AD without milk allergy (age: 2.1–9.1 years). Twenty-eight T-cell clones (TCC) were established from the blood of three children sensitized to cow's milk and hen's egg who reacted to double-blind, placebo-controlled oral food challenge both with a deterioration of AD and wilh immediate symptoms. Surprisingly, 16 of 28 casein- or ovalhumin-specific TCC were CD8+. All TCC produced high amounts of IFN-γ upon stimulation with concanavalin A. In addition. 75%. of the CD4+ TCC and 44% of the CD8+ TCC secreted IL-4. Our results indicate that: (i) food-specific proliferation of blood lymphocytes can be detected in patients with clinically relevant food allergy with LPS-depleted allergens in vitro and (ii) circulating food-specific lymphocytes are CD4+ and CD8+ T cells with the capacity of producing both type 1 and type 2 cytokines.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary Tacalcitol is a vitamin D analogue which has been developed for the therapy of psoriasis vulgaris. The treatment with a twice daily application of 2μg/g ointment is efficacious and safe in Japanese patients. The objective of this randomized, placebo-controlled, intraindividual right-left comparison was to investigate the efficacy and safety of 8 weeks' therapy with a once daily application of a 4 μg/g tacalcitol ointment in Caucasian psoriatics.The data on 122 male and female patients were analysed. The score sum of erythema, infiltration and desquamation was influenced significantly more by tacalcitol ointment than by placebo (P〈0.0001) at every control point, starting from week 2. With regard to the individual symptoms of desquamation, infiltration and erythema, the treatment with tacalcitol was also superior to placebo treatment beginning at week 2. Qualitatively, the same results were obtained with the preference assessment of both treated body sides and also the global assessments of efficacy and benefit. Symptoms of local skin irritation which may be related to the active compound or the ointment base were reported by 12·3% of patients. In only one patient, irritation required discontinuation of tacalcitol treatment. Laboratory criteria, including serum calcium, serum phosphate and serum levels of calcitonin, parathormone, 1α,24-dihydroxyvitamin D3 and 25- hydroxyvitamin D3 did not reveal any changes of clinical relevance during or after treatment. Furthermore, the global assessment of tolerance was good or very good in more than 90% of cases. The results of this study demonstrate that the once daily application of a 4 μg/g tacalcitol ointment is an efficacious therapy for psoriasis vulgaris in Caucasian patients, and that its tolerance is good, wherever the lesion is located, including on the face.
    Type of Medium: Electronic Resource
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