PMID: 8971179Dec 15, 1996Paper

Independent regulation of invasion and anchorage-independent growth by different autophosphorylation sites of the macrophage colony-stimulating factor 1 receptor

Cancer Research
E SapiB M Kacinski

Abstract

Invasion of tissue by macrophages and implantation into the uterine wall by placental trophoblasts are known to be regulated by the macrophage colony-stimulating factor (CSF-1) and its receptor (CSF-1R, the product of the c-fms proto-oncogene). Recently, the clinical importance of CSF-1 and CSF-1R in invasive breast carcinoma has been recognized, but the significance of coexpression of CSF-1 and CSF-1R in mammary epithelial cell invasion has not been explored. In the present study, we investigated the invasive potential of a noninvasive, CSF-1R-negative, mouse mammary epithelial cell line (HC11) expressing a high level of CSF-1, which was stably transfected with the mouse wild-type CSF-1R. Compared with parental cells, transfected cells expressing a wild-type CSF-1R invaded 100-fold more efficiently through a barrier of reconstituted basement membrane (Matrigel) and formed colonies in soft agar, whereas the cellular growth rate was only slightly increased. Analysis of cell-conditioned medium by zymography and quantitative enzyme activity assays showed that clones transfected with a wild-type CSF-1R expressed significantly higher levels of urokinase-type plasminogen activator than did untransfected clones. Furthermore, after inj...Continue Reading

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