Abstract
A cell line, ROSE 199, derived from rat ovarian surface epithelium (ROSE) formed papillary structures which resembled, histologically, serous papillary cystadenomas of borderline malignancy seen in the human ovary. Crowded cultures produced two layers of cells separated by a thick layer of collagen fibers. Such cultures shed viable cells into the growth medium, while no cells were shed by short-term ROSE cultures. The resemblance to ovarian tumors exhibited by ROSE 199 cells in culture, reinforces the hypothesis that the common epithelial tumors of the ovary are derived from the ovarian surface epithelium. ROSE 199 cells, while retaining their epithelial morphology and ultrastructural characteristics, express stromal activity such as abundant collagen production. Perhaps this ability to express epithelial and stromal behavior is a contributing factor to the ready neoplastic transformation of the ovarian surface epithelium.
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