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- W2079487987 abstract "Although an immunosuppressant, FK506, has been known to stimulate growth hormone (GH) release from rat somatotropes, the cellular signaling mechanism is unknown. In the present study, intracellular signaling pathways were investigated for FK506- and cyclosporin A (CsA)-induced GH release in cultured rat anterior pituitary cells. Northern and Western blot analysis revealed that the FK506-binding protein (FKBP12) and the CsA-binding protein (cyclophilin A) exist at the mRNA and protein level in the rat anterior pituitary tissue. FK506 and CsA increased GH release in a dose-dependent manner and inhibited calcineurin (CaN) activity in the cultured pituitary cells. The third immunosuppressant, rapamycin (RP), inhibited the FK506-induced GH release, although RP alone had no effect. Protein kinase A (PKA) inhibitors, H-89 and HA-1004 and EGTA blocked FK506- and CsA-induced GH release. TGF-β did not alter basal GH release, but inhibited FK506-induced GH release. GH primary transcripts were increased by FK506, and the effects were blocked by H-89 and HA-1004. These results suggest that the immunosuppressants, FK506 and CsA, stimulate GH release by inhibiting CaN activity which results in the activation of the PKA system in the rat somatotropes. TGF-β receptors might be involved in FK506-induced GH release as a separate pathway. FK506 also stimulates GH primary transcripts via a PKA-dependent mechanism in a manner similar to its effects on GH release." @default.
- W2079487987 created "2016-06-24" @default.
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- W2079487987 date "1998-01-01" @default.
- W2079487987 modified "2023-09-25" @default.
- W2079487987 title "Cellular Signaling Mechanisms for Stimulation of Growth Hormone Secretion and Growth Hormone Primary Transcripts by Immunosuppressant Agents, FK506 and Cyclosporin A, in Cultured Rat Pituitary Cells" @default.
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- W2079487987 doi "https://doi.org/10.1159/000026350" @default.
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