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Previous studies have demonstrated that ovulatory female goldfish release a variety of sex steroids into the water where they function as a pheromonal blend dominated by C 21 steroids that stimulates male hormone release, sperm production and behavior. This study investigated whether male...
Body growth in vertebrates is chiefly regulated by the GH/IGF axis. Pituitary growth hormone (GH) stimulates liver insulin-like growth factor-I (IGF-I) production. During fasting, plasma IGF-I levels decline due to the development of liver GH resistance, while GH levels generally increase. In...
The identity of the maturation-inducing steroid (MIS) in black porgy, Acanthopagrus schlegeli , a marine protandrous teleost, is unknown. Previous studies demonstrated that two teleost MISs, the progestins 17,20β,21-trihydroxy-4-pregnen-3-one (20β-S) and 17,20β-dihydroxy-4-pregnen-3-one (DHP)...
In fish, luteinizing hormone (LH) stimulates processes leading to final oocyte maturation and ovulation in females, and spermiation in males. The hormone is a heterodimeric glycoprotein composed of two non-covalently associated subunits. In this study, we describe the expression of tilapia LH...
The effects of glucocorticoid (GC) hormones are mediated via an intracellular receptor, the glucocorticoid receptor (GR). It has been established that glucocorticoid down-regulate GR. Ginsenosides (GSS) from extract of Panax ginseng have demonstrated glucocorticoid-like activities in homeostasis...
The present communication is an attempt to demonstrate the influence of melatonin on the action of maturation inducing hormone (MIH) on the maturation of oocytes in carps. The oocytes from gravid female major carp Labeo rohita were isolated and incubated separately in Medium 199 containing (a)...
Neuromedin U (NMU), which is a brain-gut peptide, was first isolated as a smooth-muscle-contracting peptide from the porcine spinal cord in 1985. Intracerebroventricular (icv) injection of NMU into rats significantly reduced the food intake during dark period, and increased oxygen consumption,...
It is established that dopamine inhibits while GABA stimulates LH release in goldfish. In this study, we examine dopaminergic regulation of GABAergic activity in the hypothalamus of early recrudescent female goldfish ( Carassius auratus ). We utilize a unique technique that permits concomitant...
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