Journal
MOLECULAR IMMUNOLOGY
Volume 44, Issue 11, Pages 2943-2949Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.molimm.2007.01.007
Keywords
complement; biosynthesis; soluble complement regulators; cytokines
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Extrahepatic complement synthesis is believed to play an important role in host defense and inflammation at tissue and organ level. In the epidermis the most abundant cell type, keratinocytes have been shown to produce C3, factor B and factor H. In the present study, we investigated the synthesis of factor I by human keratinocytes. We also studied whether proinflammatory cytokines IL-1 alpha, IL-6, TGF-beta 1, TNF-alpha and IFN-gamma regulate factor I synthesis in keratinocytes. Human keratinocytes constitutively expressed factor I mRNA and produced factor I protein. Amongst the above-mentioned cytokines, only IFN-gamma regulated the synthesis of factor I, and this effect occurred predominantly at pre-translational level. Factor I produced by keratinocytes was functionally active in cleaving C3b. In conclusion, we demonstrate that keratinocytes are capable of synthesizing factor I, and that this synthesis is regulated by IFN-gamma. (c) 2007 Published by Elsevier Ltd.
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