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Biology of Reproduction, Vol 46, 1136-1143, Copyright © 1992 by Society for the Study of Reproduction
ARTICLES |
J Mulholland, JD Aplin, S Ayad, L Hong and SR Glasser
Department of Cell Biology, Baylor College of Medicine, Houston, Texas 77030.
The expression of collagen type VI in the extracellular matrix of rat uterine endometrial stroma after a decidual stimulus was examined by immunolocalization and immunoblotting. The intermediate filament protein, desmin, was used as a marker to identify decidual cells. Tissue was examined from pregnant animals and from ovariectomized, hormone-treated rats in which decidualization had been induced artificially. In undifferentiated tissue from both groups of animals, collagen type VI was abundant, and desmin was present only in vascular smooth muscle cells. By 72 h after a decidual stimulus, however, collagen type VI had essentially disappeared from the matrix of the antimesometrial stromal compartment, and desmin was highly expressed in the decidualizing cells. During regression of the decidual tissue, collagen type VI began to reappear in the stromal matrix, whereas desmin expression declined as decidual cells degenerated. These results indicate that remodeling of the uterine extracellular matrix in response to embryo implantation is a function of the differentiating decidual cell.
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