BINDING OF PROLACTIN TO THE RABBIT MAMMARY GLAND DURING PREGNANCY

in Journal of Endocrinology
Authors:
A. S. McNEILLY
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H. G. FRIESEN
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Department of Physiology, Faculty of Medicine, University of Manitoba, 770 Bannatyne Avenue, Winnipeg, Canada, R3E 0W3

(Received 7 April 1977)

Binding of prolactin to the rat mammary gland is low during pregnancy and only increases at parturition (Holcomb, Costlow, Bushchow & McGuire, 1976). Holcomb et al. (1976) have suggested that failure to demonstrate binding of prolactin may be related to occupancy of the prolactin receptor by placental lactogen. However, the rabbit apparently does not produce a placental lactogen (Kelly, Tsushima, Shiu & Friesen, 1976; McNeilly & Friesen, 1977), and it was therefore of considerable interest to determine whether the results of binding of prolactin to the rabbit mammary gland during pregnancy showed significant differences from those obtained in the rat.

Mammary glands were taken from pregnant New Zealand White rabbits killed by an i.v. overdose of sodium pentobarbitone on each of days 10, 15, 20, 25, 28, 29, 30 and

 

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