Abstract
Cytokeratin (CK)-positive cells were obtained from bovine corpora lutea. When cultured, these cells behave like CK-positive endothelial cells obtained from bovine large blood vessels. The origin of CK-positive cells has now been studied in 45 bovine corpora lutea of different estrous cycle stages. Additionally, 7 corpora lutea of pregnant cows were examined. The tissues were grouped into early stage (days 2 to 4), secretory stage (days 5 to 17) and late stage (days 18 to 21) according to gross morphology, wet weight and total progesterone content. One portion of a corpus luteum was used for immunohistochemistry, and another for Western blot analysis. Twenty-six of the 45 corpora lutea showed CK expression, as confirmed by immunostaining and Western blotting. Cytokeratin expression was found in all corporalutea from the early stage, in 14 of 26 corpora lutea from the secretory stage, and 3 of 10 from the late stage. Early stage corpora lutea displayed “zonation” such that a high number of CK-positive luteal cells occurred in the region of the previous granulosa layer and a very low number in the previous thecal layer. Secretory CK-positive corpora lutea showed uniformly distributed, predominantly large luteal cells. In secretory corpora lutea of group A, CK-positive cells and a distinct microvascular tree were seen, the latter visualized by factor VIII-related antigen immunolabelling of endothelial cells. Group B showed none or very few CK-positive cells. Corpora lutea of pregnant cows behaved like corpora lutea of group B. Roughly 1% of CK-positive cells closely associated with the capillary wall were sometimes reminiscent of endothelial cell sprouts.
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Ricken, A.M., Spanel-Borowski, K., Saxer, M. et al. Cytokeratin expression in bovine corpora lutea. Histochem Cell Biol 103, 345–354 (1995). https://doi.org/10.1007/BF01457809
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DOI: https://doi.org/10.1007/BF01457809