Ovine endometrial cells were isolated from ovariectomized oestrogen and progesterone-treated ewes and maintained in primary culture. In-vitro treatment with human interferon-α2 (Roferon, Hoffman La Roche) (5, 50 IU/ml) or purified ovine trophoblast protein 1 (oTP-1, 30 ng/ml) significantly attenuated PGF2α (25±17, 29±17, 28±9%±SEM of control [no in-vitro treatment = 100%] respectively, N=4 ewes) and PGE (11±4, 16±4, 16±5% of control) release from the cultured cells. Fluorography of two dimensional polyacrylamide gel electrophoretic analyses of proteins secreted by the cells following 35S-methionine incorporation, revealed that synthesis and secretion of the same "pregnancy-related" proteins was stimulated by both interferon-α2 and oTP-1. Thus, interferon-α2 (which has sequence homology with oTP-1) acts on the ovine endometrium, eliciting similar biological responses to those of oTP-1.
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