Abstract
Current ideas about the mechanism of wound healing and the pathogenesis of atherosclerosis, pulmonary fibrosis and hepatic fibrosis suggest a central role for the mononuclear phagocyte in attracting and/or stimulating the proliferation of mesenchymal cells1–5. We demonstrate here that activated human blood monocytes, but not resting monocytes, release a mediator that attracts smooth muscle cells and cooperates with other mediators to stimulate fibroblast proliferation. This mediator is very similar to platelet-derived growth factor (PDGF): its Chromatographic properties and chemical stability are similar to those of PDGF6,7, it competes with 125I-PDGF for binding to fibroblasts and it immunoprecipitates with anti-PDGF antibodies. In parallel, stimulated monocytes, but not resting monocytes, express the c-sis proto-oncogene, a gene coding for one of the PDGF chains8,9, consistent with the concept that expression of the c-sis proto-oncogene may be involved in the ability of mononuclear phagocytes to modulate the accumulation of mesenchymal cells.
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Martinet, Y., Bitterman, P., Mornex, JF. et al. Activated human monocytes express the c-sis proto-oncogene and release a mediator showing PDGF-like activity. Nature 319, 158–160 (1986). https://doi.org/10.1038/319158a0
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DOI: https://doi.org/10.1038/319158a0
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