Effect of testosterone upon the beta-glucuronidase activity of some target tissues of the frog, Rana esculenta.
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Biomedical subjects
Publications and source records attributed to M Milone.
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In this study the authors have tried to furnish experimental support for the importance of fat bodies in the normal functioning of the hypothalamo-hypophyseal-gonadal system of the male frog, Rana esculenta. These experiments have shown a hypothalamo-hypophyseal control of the mobilization of fat body contents, directly involved in the control of testicular activity. Furthermore it is proposed that the fat body contents are released into the testis through direct vascular contacts between the two organs. We suggest that the A1 cells (lactotrophs) and/or B2 cells (FSH-gonadotrops) of the pars distalis gonadotropins are incapable of stimulating the testis in the absence of fat bodies. In the light of these results a scheme has been put forward showing the position of fat bodies in the hypothalamo-hypophyseal-gonadal axis of the frog.
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Daily s.c. injections of cyproterone acetate cause a time-related decrease in the weight and beta-glucuronidase activity of seminal vesicles in mouse. Protein content shows an initial increase and subsequently, after 120-180 days of treatment, a decline (reaching control levels). Acid phosphatase activity also decreases but only after long-term treatments. 5 alpha-DHT tends to bring the values of various parameters towards the control range. However, its effects are of a lesser magnitude in animals treated for 90 days with the antiandrogen. It is proposed that the antifertility action of cyproterone acetate is due mainly to its negative influence not only on the epididymis but also on seminal vesicles.
The influence of cyproterone acetate (CA) (0.1 mg/mouse/day) on the epididymis and male fertility was analyzed in a long-term study in the Swiss albino cc strain. CA inhibits epididymal function in all segments as measured by organ weights, protein content and beta-glucuronidase activity. This antiandrogen also suppresses male fertility. It is important to note that the low dose of CA, used in this study, does not affect spermatogenesis. The effects of CA on epididymis and fertility are reversible and the magnitude of recovery or the period (in days) required for a significant recovery after the discontinuation of CA were seemingly directly proportional to the duration of antiandrogen treatment.