Abstract
We have developed a co-culture system to study paracrine effects of fetal mesenchyme cells on the growth of primary mammary epithelial cells of the mouse. The method should be adaptable for study of interaction of a variety of cell populations. The procedure is simple and inexpensive. The culture consists of four layers: a monolayer of mesenchyme cells on a plastic culture dish, a soft agarose layer overlaying the cell monolayer, epithelial cells suspended in collagen gel placed atop the agarose, and culture medium above the collagen gel. The agarose layer prevents direct contact of two different cell populations but allows soluble molecules produced by either cell population to diffuse through the system, so as to contact and interact with the other cell population.
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