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    J Allergy Clin Immunol. 2008 Aug;122(2):261-6. Epub 2008 Apr 25.

    Antimicrobial peptides and the skin immune defense system.

    Source

    Department of Dermatology and Allergology, Ludwig-Maximilians-University, Munich, Germany.

    Abstract

    Our skin is constantly challenged by microbes but is rarely infected. Cutaneous production of antimicrobial peptides (AMPs) is a primary system for protection, and expression of some AMPs further increases in response to microbial invasion. Cathelicidins are unique AMPs that protect the skin through 2 distinct pathways: (1) direct antimicrobial activity and (2) initiation of a host response resulting in cytokine release, inflammation, angiogenesis, and reepithelialization. Cathelicidin dysfunction emerges as a central factor in the pathogenesis of several cutaneous diseases, including atopic dermatitis, in which cathelicidin is suppressed; rosacea, in which cathelicidin peptides are abnormally processed to forms that induce inflammation; and psoriasis, in which cathelicidin peptide converts self-DNA to a potent stimulus in an autoinflammatory cascade. Recent work identified vitamin D3 as a major factor involved in the regulation of cathelicidin. Therapies targeting control of cathelicidin and other AMPs might provide new approaches in the management of infectious and inflammatory skin diseases.

    PMID:
    18439663
    [PubMed - indexed for MEDLINE]
    PMCID:
    PMC2639779
    Free PMC Article

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