Figure 2From: Tamoxifen induces pleiotrophic changes in mammary stroma resulting in extracellular matrix that suppresses transformed phenotypesInfluence of tamoxifen treatment on mammary stromal fibroblasts and macrophages. (a) Motility of primary mammary fibroblasts isolated from individual control rats (Ctl; n = 7), tamoxifen-treated rats (Tam; n = 10), and pooled populations (insert). (b) One-dimensional gel of extracellular matrix (ECM) proteins laid down in culture by primary mammary fibroblasts isolated from control and tamoxifen-treated rats. Arrow shows about a prominent 250 kD band identified as containing fibronectin (FN) by mass spectrometry, which is present in control ECM and greatly reduced in tamoxifen ECM. Lane 3 depicts molecular weight (MW) marker. (c) upper panel: 5 μm representative sections of mammary glands stained for CD68, a macrophage lysosomal-associated protein. 400× magnification. (c) lower panel: Quantitation of CD68 positive mammary cells in control (n = 6) and tamoxifen-treated (n = 6) rats demonstrates significantly fewer macrophages with tamoxifen treatment (*p = 0.013).Back to article page