GABAB receptors induce phasic release from medial habenula terminals through activity-dependent recruitment of release-ready vesicles
Peter Koppensteiner, Pradeep Bhandari, Cihan Önal, Carolina Borges-Merjane, Elodie Le Monnier, Utsa Roy, Yukihiro Nakamura, Tetsushi Sadakata, Makoto Sanbo, Masumi Hirabayashi, JeongSeop Rhee, Nils Brose, Peter Jonas, Ryuichi Shigemoto · FENS Forum 2024
GABAB receptor (GBR) activation inhibits neurotransmitter release in axon terminals in the brain, except in medial habenula (MHb) terminals, which show robust potentiation. However, mechanisms underlying this enigmatic potentiation remain elusive. Here, we report that GBR activation on MHb terminals induces an activity-dependent transition from a facilitating, tonic to a depressing, phasic neurotransmitter release mode. This transition is accompanied by a 4.1-fold increase in readily releasable vesicle pool (RRP) size and a 3.5-fold increase of docked synaptic vesicles at the presynaptic activ
ePoster · Neuroscience