DISTRIBUTION OF MALE AND FEMALE STEROID SEX HORMONES IN SOME ORGANS OF THE MALE RAT

1970 ◽  
Vol 65 (1) ◽  
pp. 103-110 ◽  
Author(s):  
Kjell J. Tveter
Keyword(s):  
Skeletal Muscle ◽  
Pituitary Gland ◽  
Anterior Pituitary ◽  
Liquid Scintillation ◽  
Specific Activity ◽  
Seminal Vesicles ◽  
Anterior Pituitary Gland ◽  
Male Rats ◽  
Male Rat ◽  
Accessory Sex Organs

ABSTRACT [6,7-3H] 17β-Oestradiol with a specific activity of 42.4 Ci/mmole was injected intramuscularly into three to four month old male rats, castrated three days previously. The radioactivity in liver, skeletal muscle, blood, the anterior pituitary gland, the seminal vesicles and in the different prostatic lobes was measured by liquid scintillation counting at different intervals after the administration. A high and prolonged uptake of radioactivity was found in the anterior pituitary gland. The uptake by the accessory sex organs was much lower, but significantly higher than that by skeletal muscle. The uptake by the prostate and the seminal vesicles in castrated animals was similar to that in non-castrated animals. The pattern of radioactivity uptake in the anterior pituitary gland of castrated male rats given [3H] testosterone was distinctly different from that after administration of [3H] 17β-oestradiol. There was a rapid elimination of radioactivity from the adenohypophysis after the administration of [3H] testosterone.

Prolactin release, oestrogens and proliferation of prolactin-secreting cells in the anterior pituitary gland of adult male rats

1986 ◽  
Vol 108 (3) ◽  
pp. 399-403 ◽  
Author(s):  
R. L. Pérez ◽  
G. A. Machiavelli ◽  
M. I. Romano ◽  
J. A. Burdman
Keyword(s):  
Cell Proliferation ◽  
Pituitary Gland ◽  
Adult Male ◽  
Anterior Pituitary ◽  
Pituitary Hormones ◽  
Anterior Pituitary Gland ◽  
Male Rats ◽  
Serum Prolactin ◽  
Prolactin Release ◽  
Experimental Conditions

ABSTRACT Relationships among the release of prolactin, the effect of oestrogens and the proliferation of prolactin-secreting cells were studied under several experimental conditions. Administration of sulpiride or oestradiol released prolactin and stimulated cell proliferation in the anterior pituitary gland of adult male rats. Clomiphene completely abolished the rise in cell proliferation, but did not interfere with the sulpiride-induced release of prolactin. Treatment with oestradiol plus sulpiride significantly increased serum prolactin concentrations and the mitotic index compared with the sum of the stimulation produced by both drugs separately. Bromocriptine abolished the stimulatory effect of oestradiol on the serum prolactin concentration and on cell proliferation. In oestradiol- and/or sulpiride-treated rats, 80% of the cells in mitoses were lactotrophs. The remaining 20% did not stain with antisera against any of the pituitary hormones. The number of prolactin-secreting cells in the anterior pituitary gland significantly increased after the administration of oestradiol or sulpiride. The results demonstrate that treatment with sulpiride and/or oestradiol increases the proliferation and the number of lactotrophs in the anterior pituitary gland of the rat. J. Endocr. (1986) 108, 399–403

Involvement of the adrenal glands and testis in gap junction formation via testosterone within the male rat anterior pituitary gland

2012 ◽  
Vol 75 (12) ◽  
pp. 1632-1638 ◽  
Author(s):  
Eisuke Sakuma ◽  
Ikuo Wada ◽  
Takanobu Otsuka ◽  
Kenjiro Wakabayashi ◽  
Kinya Ito ◽  
...  
Keyword(s):  
Pituitary Gland ◽  
Gap Junction ◽  
Anterior Pituitary ◽  
Adrenal Glands ◽  
Anterior Pituitary Gland ◽  
Male Rat ◽  
Junction Formation

Relationships among release of prolactin, synthesis of DNA and growth of the anterior pituitary gland of the rat: effects of oestrogen and sulpiride

1982 ◽  
Vol 94 (1) ◽  
pp. 1-10 ◽  
Author(s):  
G. A. Jahn ◽  
G. A. Machiavelli ◽  
L. E. Kalbermann ◽  
I. Szijan ◽  
G. E. Alonso ◽  
...  
Keyword(s):  
Pituitary Gland ◽  
Anterior Pituitary ◽  
Single Injection ◽  
Serum Levels ◽  
Anterior Pituitary Gland ◽  
Male Rats ◽  
Maximum Increase ◽  
End Of Treatment ◽  
Pituitary Glands ◽  
Prolactin Synthesis

The effect of daily injections of sulpiride was compared with that of a single injection of the drug in male rats which had been treated with oestradiol diundecenoate for various periods of time. We studied the effect of the different treatments on weight of the pituitary gland, concentration of prolactin and incorporation of [3H]thymidine into DNA in the pituitary gland and on serum levels of prolactin. Administration of the oestrogen produced a marked increase in the synthesis of DNA at day 7. The stimulation diminished at day 21 and was not significant at day 45. The maximum increase in the concentration of prolactin in serum and pituitary glands was observed during the first 7 days (approximately 400 and 150% respectively) and in the weight of the anterior pituitary gland after 21 days of treatment (approximately 107%). A single injection of sulpiride markedly stimulated the release of prolactin and the synthesis of DNA at day 7. Both these effects diminished at day 21 and disappeared by day 45. Daily injections of sulpiride also produced similar changes in the release of prolactin and in the replication of DNA. The growth of the anterior pituitary gland was greater in this group than in the rats which had been treated with oestradiol diundecenoate only. After the end of treatment with oestrogen and sulpiride the pituitary weight and the concentration of prolactin in the anterior pituitary gland diminished together with levels of prolactin and oestrogen in serum. There was a good correlation between weight of the gland and serum levels of prolactin. The results further support the idea of a mechanism which controls the proliferation of lactotrophs in which the release of the hormone is accompanied by an increase in pituitary DNA synthesis.

ANDROGEN RECEPTORS IN THE RAT BRAIN, ANTERIOR PITUITARY GLAND AND VENTRAL PROSTATE GLAND: EFFECTS OF ORCHIDECTOMY AND AGEING

1979 ◽  
Vol 81 (1) ◽  
pp. 75-81 ◽  
Author(s):  
B. D. GREENSTEIN
Keyword(s):  
Pituitary Gland ◽  
Binding Sites ◽  
Anterior Pituitary ◽  
Androgen Receptors ◽  
Prostate Gland ◽  
Anterior Pituitary Gland ◽  
Male Rats ◽  
Ventral Prostate ◽  
Binding Reaction ◽  
Old Rats

Available high-affinity binding sites for 5α-dihydrotestosterone (DHT) were measured in cytosols obtained from the amygdala, hypothalamus, anterior pituitary gland and ventral prostate gland of 12-week-old rats at various times after orchidectomy, and in the corresponding tissues of 18-month-old male rats. It is suggested that the lower affinity of the DHT binding reaction in brain and ventral prostatic cytosols after orchidectomy or ageing respectively, may explain, at least in part, the changes in the responsiveness of the tissues to androgens.

METABOLISM AND MODE OF ACTION OF ANDROGENS IN TARGET TISSUES OF MALE RATS

1972 ◽  
Vol 69 (1) ◽  
pp. 153-164 ◽  
Author(s):  
L. Buric ◽  
H. Becker ◽  
C. Petersen ◽  
K. D. Voigt
Keyword(s):  
Skeletal Muscle ◽  
Adult Male ◽  
Mode Of Action ◽  
Total Radioactivity ◽  
Seminal Vesicles ◽  
Male Rats ◽  
Peripheral Muscle ◽  
Target Organs ◽  
Accessory Sex Organs ◽  
Testosterone Administration

ABSTRACT Either 0.7 μg [1,2-3H] testosterone* (51 Ci/mm) or 0.8 μg [1,2-3H] 5α-dihydrotestosterone (44 Ci/mm) was administered intravenously to normal adult male rats 3, 7, and 12 days after castration. 30 min after the injection, the animals were sacrificed. Total radioactivity counting was performed on aliquots of extracts of blood, peripheral muscle, prostates and seminal vesicles. In a first TCL the extracts were separated into five fractions. Further purification by acetylation and repeated chromatographic procedures revealed, that fraction C consisted of about 90 % of testosterone, fraction D of varying amounts of 5α- and 5β-DHT, fraction E of androstanedione and androstenedione, and fraction B mainly of androstanediols. The following results should be mentioned: 1. The radioactivity uptake by the accessory sex organs was significantly higher than that of skeletal muscle. The highest values were found on day 3 after castration. 5α-DHT under all conditions produced higher concentrations in the target tissues than testosterone, whereas in skeletal muscle the opposite was found. 2. After testosterone administration testosterone was very efficiently converted to 5α-DHT in target organs. Nevertheless substantial amounts of testosterone and of androstanedione and androstanediols are present. In blood, however, only small amounts of labelled 5α-DHT were found. After 5α-DHT administration, in target organs, 5α-DHT was converted to androstanedione and androstanediols up to about 20%. In blood the bulk of radioactivity was related to the androstanediol fraction. No conclusion therefore can be drawn from the data obtained in blood on the metabolic events occurring in the target organs. 3. The sequence of metabolic events in the target tissues supports the concept of a preferred 17-hydroxy pathway and a lack of 5β-reductase.

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