Abstract
Decidual prolactin-releasing factor (PRL-RF), a placental protein that stimulates the release of prolactin from human decidual tissue, has been purified from conditioned medium of human placental explants. The purification scheme consisted of ethanol extraction, anion exchange chromatography on DEAE-cellulose, size exclusion chromatography on Spherogel TSK-3000, and either a) immunoaffinity chromatography using an antiserum to a partially purified PRL-RF preparation or b) acetic acid-urea/SDS 2-dimensional PAGE. The apparent molecular weight of the purified releasing factor, estimated by SDS-PAGE, was 23,500 Da; and the half-maximal dose for the acute stimulation of prolactin release from human decidual cells was 0.05-0.1 ug/ml (2.2-4.4 nM).
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