Testicular Inhibin Category

Annual changes in plasma concentrations of ir-inhibin showed a high positive correlation with estradiol concentrations. Previous study of other seasonal breeders, such as the golden hamster, suggested that testicular ir-inhibin secretion may not be directly and immediately influenced by circulating FSH levels. In addition, studies from the rat and the human also suggested that LH […]

Previous studies in the stallion and other species, such as rats and boars, have also shown that aromatase is localized only in Leydig cells. It has been reported that the aromatase activity in the testis of adult rats is regulated by LH. On the other hand, in vitro studies in the adult rat and the […]

In a previous study in the rat, the majority of the inhibin a subunit and pB subunits were immunolocalizated in fetal-type Leydig cells during fetal life, but the immunostaining was reduced in adult-type Leydig cells after birth. In the present study, the immunopositive areas of inhibin a subunits in Leydig cells were obviously larger than […]

The present study demonstrated that a clear annual change in three circulating testicular hormones and two gonadotropins occurred in stallions and that the highest levels of these hormones were noted during the breeding season. These results for seasonal changes in ir-inhibin agree with results from a previous study in this species. Other seasonal breeders, such […]

Evaluation of Inhibin a Subunit Immunostaining Sites The percentages of area in the seminiferous tubules and interstitial tissue that stained positive for inhibin a subunit are shown in Figure 4. There was no significant difference in the percentage of area in the testis that stained positive between the breeding season and the nonbreeding season. Variations […]

Immunohistochemical Localization of Inhibin a, jiA, and jiB Subunits, 3/5-HSD, and Aromatase The hematoxylin- and eosin-stained sections showed many seminiferous tubules including a large amount of sperm, germ cells, and Sertoli cells. They were surrounded by interstitial tissue filled with large cells that had a spherical nucleus and an eosinophilic cytoplasm (Fig. 1a). buy asthma […]

Evaluation of Immunostaining Sites The percentages of area in the seminiferous tubule and in the interstitial tissue that stained positive for the inhibin a subunit were determined by analyzing sections of stallion testes during the breeding (n = 5) and the nonbreeding seasons (n = 5). Ten seminiferous tubules and ten fields within the interstitial […]