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Psoriasis scales contain C5a as the predominant chemotaxin for monocyte‐derived dendritic cells
Author(s) -
Mrowietz U.,
Koch W.A.,
Zhu K.,
Wiedow O.,
Bartels J.,
Christophers E.,
Schröder J.M.
Publication year - 2001
Publication title -
experimental dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.108
H-Index - 96
eISSN - 1600-0625
pISSN - 0906-6705
DOI - 10.1034/j.1600-0625.2001.100403.x
Subject(s) - psoriasis , chemotaxis , monocyte , dendritic cell , immunology , chemistry , biology , biochemistry , receptor , antigen
Dendritic cells seem to be of major importance for the pathogenesis of psoriasis. They are increased in number in lesional psoriatic skin which is thought to be due to an increased influx from the peripheral blood regulated by chemotaxins. Using a biological/biochemical approach we have addressed the question whether psoriasis scale extracts contain proteinaceous chemotaxins for dendritic cells. Human monocytes differentiated into dendritic cells by culture with GM‐CSF and IL‐4 (MoDC) served as responder cells. Chemotactic activity for MoDC was purified by several HPLC‐steps. The results of our study show that C5a/C5a desarg is the major chemotactic peptide for MoDC in psoriasis scale extracts. In comparison to other stimuli such as fMLP or monocyte chemotactic peptide 1 (MCP‐1) C5a proved to be a most potent and efficient chemotaxin for MoDC. C5a co‐eluted with MRP14/calgranulin B which is present in large amounts in psoriasis scale extracts as identified by amino acid sequencing. However, MRP14/calgranulin B did not possess any chemotactic activity for MoDC. Our results provide evidence that C5a/C5a desarg although not specific for dendritic cells seems to be the major chemoattractant for these cells in lesional psoriasis skin.