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- W1526880510 abstract "cGMP-dependent protein kinase (cGMP kinase) has been implicated in the regulation of the cytosolic calcium level ([Ca2+]i). In Chinese hamster ovary (CHO) cells stably transfected with the cGMP kinase Iα (CHO-cGK cells), cGMP kinase suppressed the thrombin-induced increase in inositol 1,4,5-trisphosphate and [Ca2+]i (Ruth, P., Wang, G.-X., Boekhoff, I., May, B., Pfeifer, A., Penner, R., Korth, M., Breer, H., and Hofmann, F. (1993) Proc. Natl. Acad. Sci. U. S. A. 90, 2623-2627). Cholecystokinin activated intracellular calcium release via a pertussis toxin (PTX)-insensitive pathway in CHO-cGK cells. cGMP kinase did not attenuate the CCK-stimulated [Ca2+]i. In contrast, cGMP kinase suppressed calcium influx stimulated by insulin-like growth factors 1 and 2 (IGF-1 and IGF-2) via PTX-sensitive pathways. The effects of PTX and cGMP kinase on [Ca2+]i were not additive. 8-Bromo-cGMP had no effect on [Ca2+]i stimulated by IGF-1 or IGF-2 in wild type CHO cells. These results suggested that cGMP kinase inhibited the different signaling pathways by the phosphorylation of a PTX-sensitive G protein. cGMP kinase phosphorylated the α subunits of Gi1, Gi2, and Gi3 in vitro. Phosphorylation stoichiometry was 0.4 mol of phosphate/mol of Gαi1after reconstitution of heterotrimeric Gi1in phospholipid vesicles. The α subunit of Giwas also phosphorylated in vivo. These results show that cGMP kinase blocks transduction of distinct hormone pathways that signal via PTX-sensitive Giproteins. cGMP-dependent protein kinase (cGMP kinase) has been implicated in the regulation of the cytosolic calcium level ([Ca2+]i). In Chinese hamster ovary (CHO) cells stably transfected with the cGMP kinase Iα (CHO-cGK cells), cGMP kinase suppressed the thrombin-induced increase in inositol 1,4,5-trisphosphate and [Ca2+]i (Ruth, P., Wang, G.-X., Boekhoff, I., May, B., Pfeifer, A., Penner, R., Korth, M., Breer, H., and Hofmann, F. (1993) Proc. Natl. Acad. Sci. U. S. A. 90, 2623-2627). Cholecystokinin activated intracellular calcium release via a pertussis toxin (PTX)-insensitive pathway in CHO-cGK cells. cGMP kinase did not attenuate the CCK-stimulated [Ca2+]i. In contrast, cGMP kinase suppressed calcium influx stimulated by insulin-like growth factors 1 and 2 (IGF-1 and IGF-2) via PTX-sensitive pathways. The effects of PTX and cGMP kinase on [Ca2+]i were not additive. 8-Bromo-cGMP had no effect on [Ca2+]i stimulated by IGF-1 or IGF-2 in wild type CHO cells. These results suggested that cGMP kinase inhibited the different signaling pathways by the phosphorylation of a PTX-sensitive G protein. cGMP kinase phosphorylated the α subunits of Gi1, Gi2, and Gi3 in vitro. Phosphorylation stoichiometry was 0.4 mol of phosphate/mol of Gαi1after reconstitution of heterotrimeric Gi1in phospholipid vesicles. The α subunit of Giwas also phosphorylated in vivo. These results show that cGMP kinase blocks transduction of distinct hormone pathways that signal via PTX-sensitive Giproteins." @default.
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- W1526880510 date "1995-04-01" @default.
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- W1526880510 title "Cyclic GMP-dependent Protein Kinase Blocks Pertussis Toxin-sensitive Hormone Receptor Signaling Pathways in Chinese Hamster Ovary Cells" @default.
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- W1526880510 doi "https://doi.org/10.1074/jbc.270.16.9052" @default.
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