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Concept: Atopic dermatitis

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Atopic dermatitis (AD) is a common chronic inflammatory skin disease that results in significant morbidity. A hallmark of AD is disruption of the critical barrier function of upper epidermal layers, causatively linked to environmental stimuli, genetics, and infection, and a critical current target for the development of new therapeutic and prophylactic interventions. Staphylococcus aureus is an AD-associated pathogen producing virulence factors that induce skin barrier disruption in vivo and contribute to AD pathogenesis. We show, using immortalized and primary keratinocytes, that S. aureus protease SspA/V8 is the dominant secreted factor (in laboratory and AD clinical strains of S. aureus) inducing barrier integrity impairment and tight junction damage. V8-induced integrity damage was inhibited by an IL-1β-mediated mechanism, independent of effects on claudin-1. Induction of keratinocyte expression of the antimicrobial/host defense peptide human β-defensin 2 (hBD2) was found to be the mechanism underpinning this protective effect. Endogenous hBD2 expression was required and sufficient for protection against V8 protease-mediated integrity damage, and exogenous application of hBD2 was protective. This modulatory property of hBD2, unrelated to antibacterial effects, gives new significance to the defective induction of hBD2 in the barrier-defective skin lesions of AD and indicates therapeutic potential.

Concepts: Inflammation, Bacteria, Microbiology, Staphylococcus aureus, Skin, Protease, Virulence factor, Atopic dermatitis

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Patients with atopic dermatitis (AD) tend to have greatly elevated levels of serum immunoglobulin E (IgE). However, the role of IgE in the pathogenesis of AD is debated. This investigator-initiated open-label pilot study evaluates an anti-IgE-treatment approach by combining extracorporeal immunoadsorption and anti-IgE antibody omalizumab in 10 patients with severe, therapy-refractory AD. IgE levels decreased after immunoadsorption and decreased continuously in all patients during anti-IgE therapy. The reverse trend was observed during follow-up without treatment. In parallel with these observations, an improvement in AD was observed during the treatment period, with aggravation during follow-up. Further research is needed, based on the principle of reducing IgE levels in order to improve clinical symptoms, using a combination anti-IgE treatment approach, adjusted according to IgE levels.

Concepts: Immune system, Glycoproteins, Asthma, Hypersensitivity, Immunoglobulin E, Allergy, Omalizumab, Atopic dermatitis

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Evidence that atopic eczema partly originates in utero is increasing, with some studies linking the risk of developing the condition with aspects of maternal diet during pregnancy. Nicotinamide, a naturally occurring nutrient that is maintained through the dietary intakes of vitamin B3 and tryptophan has been used in the treatment of some skin conditions including atopic eczema.

Concepts: Nutrition, Death, Niacin, Fat, Essential nutrient, Eczema, Psoriasis, Atopic dermatitis

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The role of clothing in the management of eczema (also called atopic dermatitis or atopic eczema) is poorly understood. This trial evaluated the effectiveness and cost-effectiveness of silk garments (in addition to standard care) for the management of eczema in children with moderate to severe disease.

Concepts: Atopy, Eczema, Textile, Atopic dermatitis, Clothing

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Abstract Background: Pruritus ani (PA) is defined as intense chronic itching affecting perianal skin. Objective: We aimed to determine the efficacy of topical tacrolimus treatment in atopic dermatitis (AD) patients who have PA. Methods: The study included 32 patients with AD who were suffering PA. Patients were randomized into two groups. In total, 16 patients used 0.03% tacrolimus ointment and 16 patients used Vaseline® as placebo. All groups applied topical treatments to their perianal area twice daily for 4 weeks. The treatments were then reversed for 4 weeks after a 2 weeks wash out period. Results: In total, 32 patients with AD who had refractory anal itching were enrolled in the present study. None of the patients had obtained successful results with previous treatments. There was a statistically significant decrease in the recorded EASI, DLQI and itching scores for the tacrolimus group compared to the placebo groupat weeks 4 and 6 of treatment (p < 0.05). Conclusion: Topical tacrolimus treatment was well tolerated and effective in controlling persistent PA in AD patients.

Concepts: Allergy, Symptoms, Tacrolimus, Hemorrhoid, Itch, Anal fissure, Atopic dermatitis, Pruritus ani

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Research on atopic dermatitis is actively growing and continuously completing our knowledge on the pathophysiology of this complex disease.

Concepts: Atopy, Atopic dermatitis

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Leflunomide (LEF) is an immune modulator used most commonly for rheumatoid arthritis (RA). The mechanisms of action of LEF also include anti-microbial effects, particularly anti-viral effects.
OBSERVATIONS: We present three patients with atopic dermatitis on azathioprine therapy who had multiple verrucae and in two molluscum contagiosum (MC) that were resistant to repeated conventional therapies. These patients were switched to LEF, and all the patients showed complete resolution of their verrucae and MC within 2 months of starting therapy. In addition, all three patients showed equivalent to better control of their atopic dermatitis with LEF.
CONCLUSIONS: LEF has previously been reported to be a useful immune modulator for the treatment of severe atopic dermatitis. The spectrum of anti-viral effects previously seen with leflunomide did appear beneficial in these patients in clearing verrucae and MC, which had been resistant to conventional therapies while the patients were on azathioprine.

J Drugs Dermatol. 2015;14(3):230-234.

Concepts: Inflammation, Rheumatoid arthritis, Rheumatology, Molluscum contagiosum, Psoriatic arthritis, Atopic dermatitis, Wart, Cantharidin

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Canine atopic dermatitis (AD) is a common, genetically predisposed, inflammatory and pruritic skin disease. The pathogenesis of canine AD is incompletely understood.

Concepts: Inflammation, Allergy, Atopy, Atopic dermatitis

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More than fifteen years have passed since the clinical launch of topical tacrolimus for the treatment of atopic dermatitis. Its efficacy and safety have been clearly demonstrated in many global and domestic short-term and long-term clinical trials. Although the prolonged external application of steroids causes many adverse reactions including cutaneous atrophy, no such reactions occur with the use of topical tacrolimus. Therefore, the therapeutic guidelines recommend a combined topical treatment with tacrolimus and steroids. Tacrolimus is a potent immunosuppressant. However, recent studies have revealed its diverse action on the cardinal pathomechanisms of atopic dermatitis. In this review, we summarize the mechanistic role of tacrolimus in various aspects of allergic inflammation including mast cell activation, innate allergic response, pruritus, sensory nerve activation and skin barrier dysfunction. This article is protected by copyright. All rights reserved.

Concepts: Immune system, Asthma, Allergy, Mast cell, All rights reserved, Tacrolimus, Copyright, Atopic dermatitis

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