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• W2023707319 abstract "The present study was designed to characterize the cross-talk of parathyroid hormone (PTH)-responsive dual signal transduction systems (cAMP-dependent protein kinase (PKA) and calcium/protein kinase C [PKC]) and its participation in PTH-induced homologous desensitization of intracellular calcium ([Ca2+]i) in osteoblastic UMR-106 cells. Although our recent study revealed that prolonged (more than 2 h) pretreatment with PKC-activating phorbol ester, phorbol 12-myristate 13-acetate (PMA) significantly decreased the PTH-stimulated cAMP production, pretreatment with PMA (10(-7) and 10(-6) M) but not 10(-6) M 4 alpha-phorbol 12,13-didecanoate (PDD), incapable of activating PKC for 30 min significantly augmented 10(-7) M hPTH-(1-34)-stimulated cAMP production. H-7 (50 microM), a PKC inhibitor, significantly antagonized this PMA-induced effect. Pretreatment with 10(-6) M PMA for 30 min did not affect PTH receptor binding but significantly augmented a cAMP responsiveness to 10(-5) M forskolin and 1 microgram/ml cholera toxin. Pertussis toxin (0.5 microgram/ml) did not affect the PMA-induced augmentation of the PTH-stimulated cAMP production. PTH caused a complete homologous desensitization of [Ca2+]i response within 30 min. Pretreatment with 10(-4) M dibutyryl cAMP for 30 min and 6 h significantly reduced and completely blocked the PTH-induced increase in [Ca2+]i, respectively. Pretreatment with 10(-4) M Sp-cAMPs, a direct PKA activator, for 30 min completely blocked the PTH-induced increase in [Ca2+]i. Rp-cAMPS (10(-4) M), an antagonist of PKA, slightly but significantly antagonized the PTH-induced homologous desensitization of [Ca2+]i response. The present study indicates that the time of exposure to PKC activation is a critical determinant in modulating the cAMP system, while PKA activation counterregulatorily acts on the [Ca2+]i system, and that PKA activation is linked to the PTH-induced homologous desensitization of [Ca2+]i response." @default.
• W2023707319 created "2016-06-24" @default.
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• W2023707319 date "1994-02-01" @default.
• W2023707319 modified "2023-09-27" @default.
• W2023707319 title "Cross-talk of parathyroid hormone-responsive dual signal transduction systems in osteoblastic osteosarcoma cells: Its role in PTH-induced homologous desensitization of intracellular calcium response" @default.
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• W2023707319 doi "https://doi.org/10.1002/jcp.1041580220" @default.
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