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- W2149372271 abstract "Regulation of neuronal calcium channels by GTP-binding proteins (G proteins) is likely to be an important mechanism by which inhibitory transmitters influence excitation-secretion coupling in presynaptic nerve endings. Here, we report that in peripheral sensory neurons from embryonic chick dorsal root ganglia (DRG), the G protein-mediated inhibition of voltage-dependent calcium channels may best explain how norepinephrine (NE) and GABA inhibit the electrically evoked, calcium- dependent release of substance P (SP). As is the case for the previously reported inhibitory actions of these transmitters on DRG cell calcium channels, we demonstrate that NE and GABA inhibit peptide secretion through activation of alpha-adrenergic and GABAb receptors that are functionally coupled to pertussis toxin (PTX)-sensitive G proteins. Pretreatment of DRG cell cultures with PTX blocked the ability of NE and GABA to inhibit the release of SP, an action correlated with PTX-catalyzed ADP-ribosylation of membrane proteins with apparent molecular weight (Mr) of 40–41 kDa. Western immunoblot analysis of chick DRG cell membrane proteins using antisera directed against synthetic peptides corresponding to amino acid sequences predicted from cDNAs for PTX-sensitive G protein alpha subunits revealed a minimum of 2 Gi-like proteins (Mr 40 and 41 kDa) and a third Go-like protein (Mr 40 kD). Significantly, these findings implicate Gi- and/or Go-like GTP-binding proteins as mediators of presynaptic inhibition in peripheral sensory neurons." @default.
- W2149372271 created "2016-06-24" @default.
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- W2149372271 date "1989-02-01" @default.
- W2149372271 modified "2023-10-12" @default.
- W2149372271 title "G proteins couple alpha-adrenergic and GABAb receptors to inhibition of peptide secretion from peripheral sensory neurons" @default.
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- W2149372271 doi "https://doi.org/10.1523/jneurosci.09-02-00657.1989" @default.
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