Long-term suppression of Leydig cell steroidogenesis prevents Leydig cell aging
نویسندگان
چکیده
منابع مشابه
Long-term suppression of Leydig cell steroidogenesis prevents Leydig cell aging.
Male aging is accompanied by reduced testosterone production by the Leydig cells, the testosterone-producing cells of the testis. The mechanism by which this occurs is unknown. Based on the observations that reactive oxygen is capable of damaging components of the steroidogenic pathway and that reactive oxygen is produced during steroidogenesis itself, we hypothesized that long-term suppression...
متن کاملEffect of 4-hydroxyandrostenedione on murine Leydig tumor cell steroidogenesis.
The murine Leydig cell tumor (M5480A) possesses high levels of estrogen receptor and is known to produce estrogens. In these studies we examined the effects of the potent aromatase inhibitor 4-hydroxyandrostenedione (4-OHA) on Leydig tumor cell steroidogenesis both in vitro and in vivo. The addition of 4-OHA to Leydig tumor cells in primary culture resulted in a dose- and a time-dependent decre...
متن کاملProtein kinase G-mediated stimulation of basal Leydig cell steroidogenesis.
The androgen-secreting Leydig cells produce cGMP, but the pathways responsible for generation and actions of this intracellular messenger have been incompletely characterized in these cells. Here, we show the presence of mRNA transcripts for the membrane-bound and soluble guanylyl cyclases (sGC), the cGMP-specific phosphodiesterase 5, and the cGMP-dependent protein kinase I (PKG I) and PKG II i...
متن کاملRole of P2-purinergic receptors in rat Leydig cell steroidogenesis.
The present study investigated the effects of extracellular ATP on the intracellular calcium ion concentration ([Ca2+]i) and testosterone production in isolated adult rat Leydig cells. This nucleotide caused an increase in [Ca2+]i, with a maximal effect at a concentration of 100 microM ATP, comprising a rapid initial spike followed by a long-lasting plateau. The first rapid spike was dependent ...
متن کاملLeydig cell tumor1
The effects of human choriogonadotropin (HCG) stimulation on lipid composition in the murine Leydig cell tumor M5480 grown subcutaneously were determined. The main lipids of the Leydig cell tumor were found to be largely triacylglycerols and phospholipids. Daily in vivo administration of human choriogonadotropin to tumor-bearing mice for 3 days increased the phospholipid content and altered the...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1999
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.96.26.14877