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• W2034223658 abstract "The oxytocin receptor (OTR) and the β2-adrenergic receptor (β2AR) are key regulators of uterine contraction. These two receptors are targets of tocolytic agents used to inhibit pre-term labor. Our recent study on the nature of OTR- and β2AR-mediated ERK1/2 activation in human hTERT-C3 myometrial cells suggested the presence of an OTR/β2AR hetero-oligomeric complex (see companion article). The goal of this study was to investigate potential allosteric interactions between OTR and β2AR and establish the nature of the interactions between these receptors in myometrial cells. We found that OTR-mediated ERK1/2 activation was attenuated significantly when cells were pretreated with the β2AR agonist isoproterenol or two antagonists, propranolol or timolol. In contrast, pretreatment of cells with a third β2AR antagonist, atenolol resulted in an increase in OTR-mediated ERK1/2 activation. Similarly, β2AR-mediated ERK1/2 activation was strongly attenuated by pretreatment with the OTR antagonists, atosiban and OTA. Physical interactions between OTR and β2AR were demonstrated using co-immunoprecipitation, bioluminescence resonance energy transfer (BRET) and protein-fragment complementation (PCA) assays in HEK 293 cells, the latter experiments indicating the interactions between the two receptors were direct. Our analyses suggest physical interactions between OTR and β2AR in the context of a new heterodimer pair lie at the heart of the allosteric effects." @default.
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• W2034223658 date "2012-01-01" @default.
• W2034223658 modified "2023-10-18" @default.
• W2034223658 title "Allosteric interactions between the oxytocin receptor and the β2-adrenergic receptor in the modulation of ERK1/2 activation are mediated by heterodimerization" @default.
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• W2034223658 doi "https://doi.org/10.1016/j.cellsig.2011.09.020" @default.
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