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- W2103179978 abstract "G-protein-coupled receptor 39 (GPR39), a member of the ghrelin receptor family, has a full-length isoform GPR39-1a and a truncated isoform GPR39-1b. While GPR39-1a was clarified as a receptor of Zn(2+), the characteristic property of GPR39-1b remains unknown. Therefore, in this study, the molecular functions of GPR39-1b were explored in cell culture. In contrast to GPR39-1a, GPR39-1b showed no response to Zn(2+) stimulation in calcium mobilization assays, suggesting that GPR39-1b is not a functional receptor of Zn(2+). To understand the signaling interaction of GPR39-1b, we investigated the dimerization between the isoforms, and conducted bioluminescence resonance energy transfer (BRET(2)) assays. The results indicated that GPR39-1b homodimerized, but did not heterodimerize with GPR39-1a. We subsequently attempted to search the heterodimeric counterparts of GPR39-1b. Neurotensin receptor 1 (NTSR1) was also targeted as a GPR39-1b interacting partner because of its highly conserved amino acid sequence and mRNA localization, which was similar to GPR39-1b. BRET(2) assays demonstrated that GPR39-1b heterodimerized with NTSR1. To examine the effect of GPR39-1b on NTRS1-mediated cAMP/PKA signaling, we used the cAMP responsive element-luciferase assays and observed that GPR39-1b attenuated neurotensin-induced NTSR1 signaling. Taken together, our results provided a novel regulatory mechanism for GPR39-1b in NTRS1 signaling." @default.
- W2103179978 created "2016-06-24" @default.
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- W2103179978 date "2014-02-11" @default.
- W2103179978 modified "2023-10-18" @default.
- W2103179978 title "GPR39-1b, the 5-transmembrane isoform of GPR39 interacts with neurotensin receptor NTSR1 and modifies its function" @default.
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- W2103179978 doi "https://doi.org/10.3109/10799893.2014.885050" @default.
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