An implantable device based on organic electrochemical transistors is developed for quantitative mapping of neurotransmitter release across multiple brain regions, revealing a cross-talk between the mesolimbic and nigrostriatal dopaminergic pathways.
Challenging a widespread model, biophysical and electrophysiological experiments suggest a new mechanism whereby complexins inhibit neurotransmitter release through electrostatic repulsion between their accessory helix and the membranes.
Inhibition from the cerebellar nuclei to the inferior olive is exclusively asynchronous and GABAergic, whereas the vestibular nuclei provide rapid synchronous inhibition mediated by mixed GABA and glycinergic synapses.
A model for synchronous neurotransmitter release suggests that when not in the presence of calcium ions, Synaptotagmin proteins form ring-like structures between the vesicle and plasma membrane that prevent spontaneous fusion.
Neurons of the cholinergic system, which release the excitatory neurotransmitter acetycholine throughout the cortex, also release the inhibitory transmitter GABA, with potential implications for cognitive function.