Global Expression Analysis of Extracellular Matrix–Integrin Interactions in Monocytes

Central to immune and inflammatory responses are the integrin-mediated adhesive interactions of cells with their extracellular matrix (ECM)-rich environment. Using a comprehensive and quantitative mRNA profiling technique, we analyzed the effect of ECM-induced attachment on monocyte gene expression, its regulation by growth factors, and the integrin specificity of this event. Adhesion of cells to fibronectin resulted in increased expression of a large number of genes, which was strongly potentiated by the presence of growth factors. Adhesion activated both the NF-κB and Jak/STAT pathways of gene transcription and increased expression of genes involved in inflammatory and immune responses, revealing the importance of ECM–integrin interactions in these processes.