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- W4594923 abstract "Parathyroid hormone (PTH)-stimulated signal transduction through mechanisms alternate to adenosine 3',5'-cyclic monophosphate (cAMP) production were studied in UMR 106-01 cells, a cell line with an osteoblastic phenotype. PTH produced transient, dose-related increases in cytosolic calcium [( Ca2+]i), inositol trisphosphates, and diacylglycerol (DAG). Both inositol 1,4,5-trisphosphate (Ins-1,4,5P3) and inositol 1,3,4-trisphosphate (Ins-1,3,4P3) production were rapidly stimulated by PTH. Consistent with the production of Ins-1,3,4P3, rapid stimulation of late eluting inositol tetrakisphosphate was observed. The effects on the inositol phosphates were induced rapidly, consistent with roles as signals for changes in [Ca2+]i. In saponin-permeabilized UMR 106-01 cells, Ins-1,4,5P3 stimulated 45Ca release from a nonmitochondrial intracellular pool. Thus the hypothesis that PTH-stimulated Ins-1,4,5P3 production initiates Ca2+ release and contributes to transient elevations of [Ca2+]i is supported. Pretreatment of UMR 106-01 cells with pertussis toxin had no effect on PTH stimulation of inositol phosphates. Pertussis toxin reduced PTH-stimulated elevations of [Ca2+]i, but cAMP analogues had an even greater effect than pertussis toxin. These data suggest that stimulation of cAMP production during PTH stimulation may negatively affect production of rises in [Ca2+]i during PTH stimulation. The inactivation of the inhibitory G protein of adenylate cyclase by pertussis toxin could explain its action similar to cAMP analogues. Cyclic nucleotides diminish the effects of PTH on [Ca2+]i, probably interacting on a biochemical step subsequent to or independent of Ins-1,4,5P3 release." @default.
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- W4594923 date "1988-11-01" @default.
- W4594923 modified "2023-10-09" @default.
- W4594923 title "PTH elevates inositol polyphosphates and diacylglycerol in a rat osteoblast-like cell line" @default.
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- W4594923 doi "https://doi.org/10.1152/ajpendo.1988.255.5.e660" @default.
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