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• W2947521908 abstract "The parathyroid hormone 1 receptor (PTH1R) is a Class B G-protein-coupled receptor that is a target for osteoporosis therapeutics. Activated PTH1R couples through Gs to the stimulation of adenylyl cyclase. As well, β-arrestin is recruited to PTH1R leading to receptor internalization and MAPK/ERK signaling. Previously, we reported that the agonist potency of PTH1R is increased in the presence of extracellular ATP, which acts as a positive allosteric modulator of PTH signaling. Another nucleotide, cytidine 5'-monophosphate (CMP), also enhances PTH1R signaling, suggesting that ATP and CMP share a moiety responsible for positive allostery, possibly ribose-5-phosphate. Therefore, we examined the effect of extracellular sugar phosphates on PTH1R signaling. cAMP levels and β-arrestin recruitment were monitored using luminescence-based assays. Alone, ribose-5-phosphate had no detectable effect on adenylyl cyclase activity in UMR-106 rat osteoblastic cells, which endogenously express PTH1R. However, ribose-5-phosphate markedly enhanced the activation of adenylyl cyclase induced by PTH. Other sugar phosphates, including glucose-1-phosphate, glucose-6-phosphate, fructose-6-phosphate, and fructose-1,6-bisphosphate, also potentiated PTH-induced adenylyl cyclase activation. As well, some sugar phosphates enhanced PTH-induced β-arrestin recruitment to human PTH1R heterologously expressed in HEK293H cells. Interestingly, the effects of glucose-1-phosphate were greater than those of its isomer glucose-6-phosphate. Our results suggest that phosphorylated monosaccharides such as ribose-5-phosphate contain the pharmacophore for positive allosteric modulation of PTH1R. At least in some cases, the extent of modulation depends on the position of the phosphate group. Knowledge of the pharmacophore may permit future development of positive allosteric modulators to increase the therapeutic efficacy of PTH1R agonists." @default.
• W2947521908 created "2019-06-07" @default.
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• W2947521908 date "2019-05-22" @default.
• W2947521908 modified "2023-09-26" @default.
• W2947521908 title "Toward Defining the Pharmacophore for Positive Allosteric Modulation of PTH1 Receptor Signaling by Extracellular Nucleotides" @default.
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• W2947521908 doi "https://doi.org/10.1021/acsptsci.8b00053" @default.
• W2947521908 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7088899" @default.
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