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A method is presented for the isolation and purification of three cell types, endothelial cells, small luteal cells and large luteal cells, from the ovine corpus luteum. The method involves enzymatic dispersion of luteal tissue followed by centrifugation of separated cells on a Ficoll gradient. The three purified cell types and others, particularly fibrocytes and smooth muscle cells, that were removed during purification, were identified by their morphology. The cell yield, the cellular composition and cellular progesterone content of each fraction from the Ficoll gradient were measured. The endothelial cell fractions were relatively free of contamination by other cell types and had negligible progesterone. Fractions of small luteal cells and those of large luteal cells contained endothelial cells but were relatively free of other cell types. Large luteal cells contained significantly more progesterone, produced more progesterone when incubated in culture, but were less responsive to luteinizing hormone than small luteal cells.

Purification, Morphology, and Progesterone Production and Content of Three Cell Types Isolated from the Corpus Luteum of the Sheep