Abstract
Abstract An effective procedure has been developed and utilized to demonstrate the presence of prolactin receptors on the plasma membranes of human chorion-decidua cells. Particulate fractions from human chorion-decidua sedimenting between 1,500 and 45,000 × g display optimal binding of 125 I-labeled ovine prolactin when incubated at a membrane protein concentration of 200 μg per assay tube for 2 hours at 22° C. Specific binding was increased by pretreatment of the membrane particles with 5M magnesium chloride to remove endogenous prolactin. These receptors show binding parameters (affinity, 0.92 × 10 9 L/mole; capacity, approximately 80 fmoles/mg) similar to those of lactogenic receptors in the rabbit mammary gland and, the rabbit and rat liver. The presence of prolactin receptors in human chorion-decidua suggests they may play a role in mediating local action(s) of prolactin such as involvement in the decidualization reaction or in maintaining fetal osmoregulation.
Published Version
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