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B
* Laboratory of Molecular Immunoregulation, National Cancer Institute, Frederick, MD 21702; and
SUGEN, South San Francisco, CA 94080.
Macrophages produce an array of proinflammatory mediators at sites of inflammation and contribute to the development of inflammatory responses. Important roles for cytokines, such as IL-1 or TNF-
, and bacterial products, such as LPS, in this process have been well documented; however, the role for the extracellular matrix proteins, such as collagen, remains unclear. We previously reported that discoidin domain receptor 1 (DDR1), a nonintegrin collagen receptor, is expressed during differentiation of human monocytes into macrophages, and the interaction of the DDR1b isoform with collagen facilitates their differentiation via the p38 mitogen-activated protein kinase (MAPK) pathway. In this study, we report that the interaction of DDR1b with collagen up-regulates the production of IL-8, macrophage inflammatory protein-1, and monocyte chemoattractant protein-1 in human macrophages in a p38 MAPK- and NF-
B-dependent manner. p38 MAPK was critical for DDR1b-mediated, increased NF-B trans-activity, but not for IB degradation or NF-B nuclear translocation, suggesting a role for p38 MAPK in the modification of NF-B. DDR1b-mediated IB degradation was mediated through the recruitment of the adaptor protein Shc to the LXNPXY motif of the receptor and the downstream TNFR-associated factor 6/NF-B activator 1 signaling cascade. Taken together, our study has identified NF-B as a novel target of DDR1b signaling and provided a novel mechanism by which tissue-infiltrating macrophages produce large amounts of chemokines during the development of inflammatory diseases. Intervention of DDR1b signaling may be useful to control inflammatory diseases in which these proteins play an important role.
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