The acute salinity changes activate the dual pathways of endocrine responses in the brain and pituitary of tilapia.

摘要: To analyze and compare the stress osmoregulatory hormones receptors in pituitary during acute salinity changes, expression patterns of corticotropin releasing hormone (crh) hypothalamus, prolactin (prl) peptide (pRrp) telencephalon diencephalon, glucocorticoid 2 (gr2), mineralocorticoid receptor (mr), crh-r, pro-opiomelanocorticotropin (pomc), pRrp, prl, dopamine (d2-r), growth (gh), gh-receptor (gh-r) insulin-like (igf-1) transcripts were characterized euryhaline tilapia. The results indicate that crh increased hypothalamus rostral pars distalis after transfer fish to SW. Similarly, pRrp more abundant SW acclimated tilapia forebrain hypothalamus. gr2 mr expressed intermedia at than FW data acclimation stimulates these specific regions brain which may be related activation hypothalamic-pituitary-interrenal (HPI)-axis. dual situ hybridization reveal with pomc are highly co-localized corticotrophs pituitary. Furthermore, we demonstrate high low prl fish. No crh-r corticosteroid gh-r igf-1 mRNA levels significantly whereas there was no difference gh levels. suggest locally produced d2-r control regulate Therefore, roles involved (via brain-pituitary) pituitary) pathways exposed changes.