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• W1994008003 abstract "The effects of PTH on the binding and mitogenic activity of epidermal growth factor (EGF) were studied in clonal, PTH- and EGF-responsive mouse osteoblastic cell line, MC3T3-E1. Treatment of cells with synthetic rat PTH-(1-34) at 10(-10)-10(-8) M resulted in a dose-related decrease (maximally 30% relative to the control value) in the specific binding of a biologically active, 125I-iodolabeled derivative of recombinant human EGF ([125I]iodo-EGF). The PTH-induced decrease in EGF binding was time dependent, requiring at least 4 h of PTH treatment at 37 C for a maximal effect, completely reversible after cessation of PTH exposure and specific only to biologically active PTH. Scatchard analysis of saturation binding data revealed that the PTH-induced reduction of EGF binding was accounted for by a proportional decrease in the available EGF-binding sites without an alteration in binding affinity (Kd = 0.7-0.8 nM). PTH treatment resulted ina concomitant decrease in mitotic responsiveness to EGF (maximally 40-50% of control). Both of these down-regulatory effects of PTH were closely mimicked by forskolin, cholera toxin, or (Bu)2cAMP. Addition of either colchicine or cytochalasin-B during PTH treatment completely abolished the PTH-induced reduction of EGF binding. These data indicate that PTH down-regulates EGF receptors and reduces the mitotic responsiveness to EGF, probably via a cAMP-dependent cytoskeleton-mediated mechanism(s) in osteoblastic MC3T3-E1 cells." @default.
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• W1994008003 date "1989-05-01" @default.
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• W1994008003 title "Parathyroid Hormone Down-Regulates the Epidermal Growth Factor Receptors in Clonal Osteoblastic Mouse Calvarial Cells, MC3T3-E1: Possible Mediation by Adenosine 3',5'-Cyclic Monophosphate" @default.
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• W1994008003 doi "https://doi.org/10.1210/endo-124-5-2419" @default.
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