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• W2143843553 endingPage "1287" @default.
• W2143843553 startingPage "1273" @default.
• W2143843553 abstract "Ghrelin (GRLN) and its receptor have been identified and characterised in goldfish brain and the pituitary, and recent evidence shows that goldfish (g)GRLN(19) induces both growth hormone (GH) and maturational gonadotrophin (LH) release through an extracellular Ca(2+) -dependent mechanism in goldfish. To further understand the role of GRLN in hormone release, the present study examined the involvement of protein kinase C (PKC) and protein kinase A (PKA) in gGRLN(19) -induced GH and LH release and corresponding Ca(2+) signals in primary cultures of goldfish pituitary cells. Treatments with PKC inhibitors, Bis-II and Gö 6976, significantly reduced gGRLN(19) -induced GH and LH release and their corresponding intracellular Ca(2+) signals in identified somatotrophs and gonadotrophs, respectively. gGRLN(19) was unable to further stimulate hormone release or Ca(2+) signals when cells were pretreated with the PKC agonist, DiC8. PKA inhibitors, H-89 and KT 5720, inhibited gGRLN(19) -induced LH release and Ca(2+) signals in gonadotrophs but not GH release or Ca(2+) signals in somatotrophs. Interestingly, pretreatment of pituitary cells with the adenylate cyclase activator forskolin potentiated gGRLN(19) -induced GH, but not LH, release, although it had no effect on intracellular Ca(2+) signals in either cell type. Taken together, the results suggest that PKC is an important intracellular component in gGRLN(19) -induced GH and LH release, whereas PKA is involved in gGRLN(19) -elicited LH release. Furthermore, the PKA pathway potentiates gGRLN(19) -induced GH release via a Ca(2+) -independent mechanism. Overall, the present study provides insight into the neuroendocrine regulation of GH and LH release by elucidating the mechanistic aspects of GRLN, a hormone involved in many critical physiological processes, including pituitary functions." @default.
• W2143843553 created "2016-06-24" @default.
• W2143843553 creator A5030022125 @default.
• W2143843553 creator A5068974759 @default.
• W2143843553 date "2011-11-18" @default.
• W2143843553 modified "2023-09-23" @default.
• W2143843553 title "Differential Involvement of Protein Kinase C and Protein Kinase A in Ghrelin-Induced Growth Hormone and Gonadotrophin Release from Goldfish (Carassius auratus) Pituitary Cells" @default.
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• W2143843553 doi "https://doi.org/10.1111/j.1365-2826.2011.02221.x" @default.
• W2143843553 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21919972" @default.
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