Abstract
Normal mammary epithelial (NME) cells and MCF-7 cells aggregate and grow as spheroids when cultured on extracellular matrix derived from Engelbreth/ Holmes/Swarth (EHS) tumour. NME cells stop dividing and differentiate but MCF-7 cells continue to proliferate, although growth is counterbalanced by cell death. In mixed cultures of NME cells and MCF-7 cells, the two cell types form mixed aggregates but then segregate to form well separated domains, often joined by only a narrow neck of cells. In these mixed cultures the growth of MCF-7 cells is inhibited by a factor secreted by NME cells into the medium.
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