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      Cytokines and Chemokines in Irritant Contact Dermatitis

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          Abstract

          Irritant contact dermatitis is a result of activated innate immune response to various external stimuli and consists of complex interplay which involves skin barrier disruption, cellular changes, and release of proinflammatory mediators. In this review, we will focus on key cytokines and chemokines involved in the pathogenesis of irritant contact dermatitis and also contrast the differences between allergic contact dermatitis and irritant contact dermatitis.

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          New perspectives on epidermal barrier dysfunction in atopic dermatitis: gene-environment interactions.

          W Duff, Amanda J. Cork, Adam Ferguson … (2006)
          Atopic dermatitis (AD) is a multifactorial, chronic inflammatory skin disorder in which genetic mutations and cutaneous hyperreactivity to environmental stimuli play a causative role. Genetic mutations alone might not be enough to cause clinical manifestations of AD, and this review will propose a new perspective on the importance of epidermal barrier dysfunction in genetically predisposed individuals, predisposing them to the harmful effects of environmental agents. The skin barrier is known to be damaged in patients with AD, both in acute eczematous lesions and also in clinically unaffected skin. Skin barrier function can be impaired first by a genetic predisposition to produce increased levels of stratum corneum chymotryptic enzyme. This protease enzyme causes premature breakdown of corneodesmosomes, leading to impairment of the epidermal barrier. The addition of environmental interactions, such as washing with soap and detergents, or long-term application of topical corticosteroids can further increase production of stratum corneum chymotryptic enzyme and impair epidermal barrier function. The epidermal barrier can also be damaged by exogenous proteases from house dust mites and Staphylococcus aureus. One or more of these factors in combination might lead to a defective barrier, thereby increasing the risk of allergen penetration and succeeding inflammatory reaction, thus contributing to exacerbations of this disease.
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            Filaggrin loss-of-function mutations are associated with enhanced expression of IL-1 cytokines in the stratum corneum of patients with atopic dermatitis and in a murine model of filaggrin deficiency

            Sanja Kezic, Grainne M. O'Regan, Rene Lutter … (2012)
            Background Filaggrin (FLG) mutations result in reduced stratum corneum (SC) natural moisturizing factor (NMF) components and consequent increased SC pH. Because higher pH activates SC protease activity, we hypothesized an enhanced release of proinflammatory IL-1 cytokines from corneocytes in patients with atopic dermatitis (AD) with FLG mutations (AD FLG ) compared with that seen in patients with AD without these mutations (AD NON-FLG ). Objectives We sought to investigate SC IL-1 cytokine profiles in the uninvolved skin of controls and patients with AD FLG versus patients with AD NON-FLG . We also sought to examine the same profiles in a murine model of filaggrin deficiency (Flgft/Flgft [FlgdelAPfal ] mice). Methods One hundred thirty-seven patients were studied. NMF levels were ascertained using confocal Raman spectroscopy; transepidermal water loss and skin surface pH were measured. IL-1α, IL-1β, IL-18, IL-1 receptor antagonist (IL-1RA), and IL-8 levels were determined in SC tape strips from 93 patients. All subjects were screened for 9 FLG mutations. Flgft/Flgft (FlgdelAPfal) mice, separated from maFlgft/maFlgft (flaky tail) mice, were used for the preparation and culture of primary murine keratinocytes and as a source of murine skin. RT-PCR was performed using primers specific for murine IL-1α, IL-1β, and IL-1RA. Results SC IL-1 levels were increased in patients with AD FLG ; these levels were inversely correlated with NMF levels. NMF values were also inversely correlated with skin surface pH. Skin and keratinocytes from Flgft/Flgft mice had upregulated expression of IL-1β and IL-1RA mRNA. Conclusions AD FLG is associated with an increased SC IL-1 cytokine profile; this profile is also seen in a murine homologue of filaggrin deficiency. These findings might have importance in understanding the influence of FLG mutations on the inflammasome in the pathogenesis of AD and help individualize therapeutic approaches.
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              Keratinocytes as initiators of inflammation.

              V M Dixit, B Nickoloff, Samuel C. Griffiths … (1991)
              Environmental stimuli responsible for inducing cutaneous inflammation include contact allergens and ultraviolet light. We postulate that these diverse stimuli trigger a cutaneous inflammatory response by directly inducing epidermal keratinocytes to elaborate specific pro-inflammatory cytokines and adhesion molecules. The consequences are activation of dermal microvascular endothelial cells and selective accumulation of specific mononuclear cells in the dermis and epidermis. Thus, keratinocytes may act as "signal transducers", capable of converting exogenous stimuli into the production of cytokines, adhesion molecules, and chemotactic factors (acting in an autocrine and paracrine fashion) responsible for initiation of "antigen-independent" cutaneous inflammation. The initiation phase may facilitate or promote an amplification phase with additional production of tumour-necrosis factor alpha and interferon gamma via an "antigen-dependent" pathway, and keratinocyte/T cell/antigen-presenting dendritic cellular associations. The direct activation of keratinocytes, with their ability to produce the complete repertoire of pro-inflammatory cytokines, can profoundly influence endogenous and recruited immunocompetent cells, thereby providing the critical trigger responsible for the swift and clinically dramatic alterations that occur following contact between the epidermis and a host of "noxious" agents.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Mediators Inflamm
                Journal ID (iso-abbrev): Mediators Inflamm
                Journal ID (publisher-id): MI
                Title: Mediators of Inflammation
                Publisher: Hindawi Publishing Corporation
                ISSN (Print): 0962-9351
                ISSN (Electronic): 1466-1861
                Publication date (Print): 2013
                Publication date (Electronic): 25 November 2013
                Volume: 2013
                Electronic Location Identifier: 916497
                Affiliations
                1Department of Dermatology, Inselspital, University of Bern, 3010 Bern, Switzerland
                2Department of Dermatology, Mie University Graduate School of Medicine, Tsu, Mie 514-8507, Japan
                Author notes

                Academic Editor: Elisabetta Buommino

                Author information
                http://orcid.org/0000-0001-9011-3655
                Article
                DOI: 10.1155/2013/916497
                PMC ID: 3858878
                PubMed ID: 24371376
                SO-VID: e49d00b0-3f00-426c-a571-5f320286ce34
                Copyright © Copyright © 2013 Haur Yueh Lee et al.
                License:

                This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 12 September 2013
                Date accepted : 8 October 2013
                Categories
                Subject: Review Article

                ScienceOpen disciplines: Immunology
                Data availability:
                ScienceOpen disciplines: Immunology

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