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- W2126518616 abstract "Neurotransmitter release from presynaptic terminals is under the tight control of various metabotropic receptors. We report here that in addition to the regulation of Ca2+ channel activity, metabotropic GABAB receptors (GABABRs) at murine hippocampal glutamatergic synapses utilize an inhibitory pathway that directly targets the synaptic vesicle release machinery. Acute application of the GABABR agonist baclofen rapidly and reversibly inhibits vesicle fusion, which occurs independently of the SNAP-25 C-terminus. Using applications of hypertonic sucrose solutions, we find that the size of the readily releasable pool remains unchanged by GABABR activation, but the sensitivity of primed vesicles to hypertonic stimuli appears lowered as the response amplitudes at intermediate sucrose concentrations are smaller and release kinetics are slowed. These data show that presynaptic GABABRs can inhibit neurotransmitter release directly by increasing the energy barrier for vesicle fusion." @default.
- W2126518616 created "2016-06-24" @default.
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- W2126518616 date "2011-09-15" @default.
- W2126518616 modified "2023-10-17" @default.
- W2126518616 title "Activation of metabotropic GABA receptors increases the energy barrier for vesicle fusion" @default.
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- W2126518616 doi "https://doi.org/10.1242/jcs.074963" @default.
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