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Up to the present no studies have been conducted either on baseline concentrations of adrenal hormones or on hormonal responses to stress in Greater rhea ( Rhea americana ) and most ratite species. The aims of this work were to assess the presence of corticosterone in plasma of Greater rhea, to...
Effects of hCG, ovariectomy and estradiol replacement on brain, plasma and/or ovarian vasotocin in vivo, and estradiol, progesterone, 17α, 20β-hydroxy-4-pregnen-3-one and hCG on ovarian vasotocin in vitro were investigated in the catfish. A 100 IU/fish of hCG induced ovulation and elicited both...
To develop new tools to study the regulation of testis physiology in teleost fish, a medium-term ex vivo organ culture system was adopted for zebrafish testis tissue. The addition of 100 nM 11-ketotestosterone to the system supported complete spermatogenesis, as determined by morphological,...
Key peptide hormones involved in the control of appetite in vertebrates were identified, their genes characterized and their regulation studied in Atlantic salmon: two agouti-related proteins (AgRP), cocaine- and amphetamine-regulated transcript (CART) and neuropeptide Y (NPY). The AgRP-1 and...
The white sturgeon, Acipenser transmontanus , is a primitive bony fish that is recognized as an important emerging species for aquaculture. However, many aspects of its stress and reproductive physiology remain unclear. These processes are controlled by various steroid hormones. In order to...
The Ca 2+ -Calmodulin (CaM) signaling pathway has previously been shown to be involved in the regulation of teleost fish ovarian steroidogenesis. However, a putative role of CaM in testicular steroidogenesis and potential targets has not been examined. To examine whether basal steroidogenesis is...
Three cDNA sequences encoding the gonadotropin subunits, common glycoprotein α subunit (GTHα), FSHβ and LHβ subunits were isolated from marbled eel. The cDNA of GTHα encodes 116 amino acids with a signal peptide of 24 amino acids and a mature peptide of 92 amino acids. The FSHβ subunit...
The effects of estradiol on the Harderian gland (HG) are believed to be partially regulated by the transcriptional regulation of the estrogen-related genes via estrogen receptor (ER). In reptiles, however, it has not been well established whether the HG contains or expresses steroid nuclear...
Female birds deposit corticosterone into their eggs. Elevated concentrations of this hormone may interfere with the development of their offspring, and mothers should thus regulate corticosterone levels deposited into the eggs adaptively. However, if females are unable to regulate deposition,...
Steroidogenic acute regulatory protein (StAR) transfers cholesterol from the outer mitochondrial membrane to the inner membrane where the cytochrome P450 side chain cleavage enzyme (P450scc) resides. This process is the rate-limiting step in steroidogenesis. StAR cDNAs have been cloned and...
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