Interaction of murine dendritic cells with collagen up‐regulates allostimulatory capacity, surface expression of heat stable antigen, and release of cytokines

In vivo, dendritic cells (DC) reside in direct proximity to extracellular matrix (ECM) proteins. Because ECM proteins affect morphology and function of a number of cell types, this study investigated potential effects of ECM proteins on functional properties of DC. DC were generated from murine bone marrow cultures, supplemented with granulocyte‐macrophage colony‐stimulating factor, and subsequently cultured on tissue culture plates coated with various ECM proteins. Among the ECM proteins tested, collagen (COL) up‐regulated the T cell stimulatory capacity of DC. This effect was accompanied by sustained surface expression of the co‐stimulatory molecule heat stable antigen on DC and by enhanced release of interleukin‐1 and interleukin‐6, respectively. Because fibronectin or solubilized COL were unable to cause similar changes in DC phenotype or function, we conclude that adherence to COL interferes specifically with DC function. These data suggest that ECM proteins may be involved in regulation of DC phenotype as well as in their functional activation. J. Leukoc. Biol. 60: 465–472; 1996.

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