Inhibitory signaling in mammalian olfactory transduction potentially mediated by Gα(o).
Inhibitory signaling in mammalian olfactory transduction potentially mediated by Gα(o).
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DOI:
10.1016/j.mcn.2020.103585
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发表时间:
2021-01
影响因子:
3.5
通讯作者:
Ache, Barry W.
中科院分区:
文献类型:
--
作者:
Corey, Elizabeth A.;Ukhanov, Kirill;Bobkov, Yuriy V.;McIntyre, Jeremy C.;Martens, Jeffrey R.;Ache, Barry W.
Olfactory GPCRs (ORs) in mammalian olfactory receptor neurons (ORNs) mediate excitation through the Gαs family member Gαolf. Here we tentatively associate a second G protein, Gαo, with inhibitory signalling in mammalian olfactory transduction by first showing that odor evoked phosphoinositide 3-kinase (PI3K)-dependent inhibition of signal transduction is absent in the native ORNs of mice carrying a conditional OMP-Cre based knockout of Gαo. We then identify an OR from native rat ORNs that are activated by octanol through cyclic nucleotide signaling and inhibited by citral in a PI3K-dependent manner. We show that the OR activates cyclic nucleotide signaling and PI3K signaling in a manner that reflects its functionality in native ORNs. Our findings lay the groundwork to explore the interesting possibility that ORs can interact with two different G proteins in a functionally identified, ligand-dependent manner to mediate opponent signaling in mature mammalian ORNs.
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