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- W1592508082 abstract "Crude receptor preparations of rabbit mammary gland were made by differential centrifugation and reacted with lactoperoxidase-iodinated ovine prolactin (oPRL) in order to determine their binding characteristics. Receptors prepared from the mammary glands of animals less than 4 days postpartum bound oPRL with high affinity (Ka = 3.50 X 10(9) M-1), in good agreement with previous results of other investigators. The binding capacity of these preparations was 107 +/- 16.3 fmol/mg of protein. In contrast, receptors prepared from the mammary glands of late lactating rabbits (Days 25 to 30 of lactation) showed a 2.5-fold increase in binding affinity (Ka = 8.63 X 10(9) M-1, p less than 0.001) without a significant increase in binding capacity (135 +/- 21.4 fmol/mg, p greater than 0.2). Kinetic experiments revealed that the rates of association of hormone and receptor were identical in early and late receptor preparations, and that the 2.5-fold decrease the dissociation rate observed in the late preparations was fully explanatory of the differences in equilibrium binding. The mechanism of this affinity increase is not known. Such a change in binding characteristics, which would tend to enhance tissue responsiveness, may underlie the well characterized maintenance of full lactation in women despite falling concentrations of prolactin." @default.
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- W1592508082 date "1978-03-01" @default.
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- W1592508082 title "Rabbit mammary prolactin receptors. Demonstration of a late puerperal increase in affinity." @default.
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- W1592508082 doi "https://doi.org/10.1016/s0021-9258(17)34902-5" @default.
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