Lack of Influence of Hypophysectomy on Estrogen-Induced DNA Synthesis in Leydig Cells of BALB/c Mice

In mice of strains susceptible to Leydig cell tumor induction, treatment with estrogens induced a “spurt” of DNA synthesis within the first few days. This synthetic activity generally subsided, until areas of Leydig cell hyperplasia developed several months later. Autoradiographic and quantitative b...

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Bibliographic Details
Published in:JNCI : Journal of the National Cancer Institute 1977-04, Vol.58 (4), p.1047-1049
Main Authors: Huseby, Robert A., Samuels, Leo T.
Format: Article
Language:English
Subjects:
Animals
Cryptorchidism - pathology
Diethylstilbestrol - pharmacology
DNA - biosynthesis
Hyperplasia
Hypophysectomy
Leydig Cell Tumor - etiology
Leydig Cells - drug effects
Leydig Cells - metabolism
Leydig Cells - pathology
Male
Mice
Mice, Inbred BALB C
Neoplasms, Experimental - etiology
Pituitary Gland - physiology
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Summary:In mice of strains susceptible to Leydig cell tumor induction, treatment with estrogens induced a “spurt” of DNA synthesis within the first few days. This synthetic activity generally subsided, until areas of Leydig cell hyperplasia developed several months later. Autoradiographic and quantitative biochemical studies indicated that in BALB/c mice this initial DNA synthetic activity occurred in the absence of the hypophysis and apparently was the result of effects of estrogen directly on Leydig cells. Although hypophysectomy inhibited sperm maturation, [3H]thymidine incorporation into spermatogonia was reduced only slightly 2 weeks after surgery, as was the induced DNA spurt in the interstitial tissues.
ISSN:0027-8874
1460-2105
DOI:10.1093/jnci/58.4.1047