Changes in mRNAs encoding steroidogenic acute regulatory protein, steroidogenic enzymes and receptors for gonadotropins during spermatogenesis in rainbow trout testes.

Changes in steroidogenic enzyme and steroidogenic acute regulatory protein messenger RNAs in ovarian follicles during ovarian development of rainbow trout (Oncorhynchus mykiss).

In salmonid fishes, estradiol-17beta (E2) and 17alpha,20beta-dihydroxy-4-pregnen-3-one (17,20beta-P) are the major steroid hormones controlling oocyte growth (vitellogenesis) and final maturation (resumption of meiosis). The aim of this study was to determine changes in mRNAs encoding ovarian steroidogenic enzymes and steroidogenic acute regulatory protein (StAR) during ovarian development in f...

Differential suppressive effects of low physiological doses of estradiol-17b in vivo on levels of mRNAs encoding steroidogenic acute regulatory protein and three steroidogenic enzymes in previtellogenic ovarian follicles of rainbow trout

Numerous recent reports have demonstrated effects of estrogenic chemicals on reproductive physiology of fish. However, there is little information available on the regulation of ovarian steroidogenesis by physiological levels of endogenous steroids in teleosts. Therefore, we analyzed the levels of mRNAs encoding steroidogenic proteins in ovaries of E2-treated rainbow trout Oncorhynchus mykiss)....

Characterization and expression of steroidogenic acute regulatory protein and MLN64 cDNAs in trout.

Complementary DNA-encoding proteins with high homology to steroidogenic acute regulatory proteins (StAR) of mammals were cloned from rainbow trout head kidney and a mixture of several brook trout tissues. A cDNA encoding an MLN64 homolog was also cloned from brook trout. The C-terminal domains of rainbow trout StAR and brook trout StAR were very highly conserved compared with StAR of mammals. I...

Seasonal changes in gonadal expression of gonadotropin 1 receptors , steroidogenic acute regulatory protein and 2 steroidogenic enzymes in the European sea bass 3 4 5

MOLECULAR REPRODUCTION AND DEVELOPMENT 62:456–469 (2002) Molecular Cloning and Expression During Spermatogenesis of a cDNA Encoding Testicular 11b-Hydroxylase (P45011b) in Rainbow Trout (Oncorhynchus mykiss)

Cytochrome P450 1b-hydroxylase (P45011b) is an important steroidogenic enzyme for glucocorticoid and mineralocorticoid production in vertebrates. In teleosts, P45011b also plays a role in the production of 11-ketotestosterone (11-KT), the predominant androgen in male fish. In this study, we cloned a cDNA encoding rainbow trout (Oncorhynchus mykiss) testicular P45011b. The cDNA contains 1,740 nu...