Hypothalamic Control of Lactation by F. G. Sulman (auth.)

By F. G. Sulman (auth.)

The contents of this monograph "Hypothalamic regulate of Lacta­ tion" are the results of reports via a nine-man group which has labored jointly for 9 years. the subject is so attention-grabbing that new examine scholars are interested in it each year, and the circle is turning out to be gradually. this can be, actually, a part of a way more broad examine box to which our division is utilizing itself at this time, viz. "Hypo­ thalamic Pharmacology". Our paintings during this sphere was once made attainable by way of a beneficiant furnish from the USA division of Agriculture, which helped us through the first five years of study with supply No. FG-IS-147, undertaking No. A10-AH-3, and lately with one other furnish for yet another 5-year interval, No. FG-IS-259, venture No. A10-AH-33. Our thank you are because of Dr. JOEL BITMAN, Hormone body structure chief of the USDA Agri­ cultural study provider at Beltsville, Md., the sponsor of this learn. As this monograph includes normally references attached with our personal paintings, the reader who needs to make a survey of lactation may still learn the references mentioned within the bibliography, comparable to COWIE (1961, 1966), COWIE and FOLLEY (1957, 1961), FOLLEY (1952, 1956), JACOB­ SOHN (1961), LYONS and DIXON (1966), MEITES (1959a, 1961, 1966), MEITES and NICOLL (1966).

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In vitro experiments with dog mammary tissue, on the other hand, showed a dual effect of the estrogen-progesterone combination: very low levels proved to be stimulatory for lactogenesis, while higher levels exerted an inhibitory influence (BARNA WELL, 1967). To sum up, it would seem that the gonadotropins and their secondary steroids-estrogen and progesterone-are important for the development of the mammary glands in the normal female. They are, however, not required for active lactation. Chapter 6 Adrenocorticotropin and Corticosteroids It has long been established that adrenal cortical hormones, as well as prolactin, are essential for maintenance of lactation.

Recently, CLEMENS and MErTES (1968) showed that implantation of ovine prolactin into the ME of mature, intact and ovariectomized rats resulted in increased hypothalamic content of PIF, reduced pituitary prolactin concentration and pituitary weight, and marked regression of the mammary glands. This effect was enhanced by simultaneous implantation of ACTH. These results suggest that the implanted prolactin inhibits pituitary prolactin synthesis and release by directly increasing hypothalamic PIF secretion.

Three groups were implanted with tubes containing prolactin in doses of 1, 4 and 16 IU/ rat respectively, and the fourth group, which served as control, was implanted with empty tubes. The implants were carried out in the following manner: NIH-PS-8 ovine prolactin was tapped into a micro glass tube (Rudman d's disposable pipettes) and, after all the overflow material had been cleaned from the external surface of the tube, it was immediately implanted in the ME. A follow-up showed that this technique permits complete absorption of the implanted hormone.

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