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Ralf Schneggenburger

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Publications associées (38)

Integration of excitation and inhibition in a binaural auditory nucleus

Ralf Schneggenburger

Wiley-Blackwell2014

An Alien Divalent Ion Reveals a Major Role for Ca2+ Buffering in Controlling Slow Transmitter Release

Ralf Schneggenburger, Olexiy Kochubey, Daniel Keller, Zsolt Norbert Babai

Ca2+-dependent transmitter release occurs in a fast and in a slow phase, but the differential roles of Ca2+ buffers and Ca2+ sensors in shaping release kinetics are still controversial. Replacing extracellular Ca2+ by Sr2+ causes decreased fast release but ...

2014

Munc18-1 is a dynamically regulated PKC target during short-term enhancement of transmitter release

Ralf Schneggenburger, Olexiy Kochubey, Özgür Genç

Transmitter release at synapses is regulated by preceding neuronal activity, which can give rise to short-term enhancement of release like post-tetanic potentiation (PTP). Diacylglycerol (DAG) and Protein-kinase C (PKC) signaling in the nerve terminal have ...

Elife Sciences Publications Ltd2014

Molecular identity of Ca2+ sensors for transmitter release at the developing calyx of Held

Ralf Schneggenburger, Olexiy Kochubey

Wiley-Blackwell2014

Molecular mechanisms that specify fast-transmitting synapses in the auditory system

Ralf Schneggenburger

Wiley-Blackwell2014

Robo3-Driven Axon Midline Crossing Conditions Functional Maturation of a Large Commissural Synapse

Ralf Schneggenburger, Zsolt Norbert Babai

During the formation of neuronal circuits, axon pathfinding decisions specify the location of synapses on the correct brain side and in correct target areas. We investigated a possible link between axon midline crossing and the subsequent development of ou ...

Elsevier2013

BMP signaling specifies the development of a large and fast CNS synapse

Graham Knott, Ralf Schneggenburger, Le Xiao, Elin Kristina Kronander, Enida Gjoni

excitatory synapses with multiple active zones ensure reliable and fast information transfer at specific points in neuronal circuits. However, the mechanisms that determine synapse size in CNS circuits are largely unknown. Here we use the calyx of Held syn ...

Nature Publishing Group2013

Ca2+ channels and transmitter release at the active zone

Ralf Schneggenburger, Yunyun Han, Olexiy Kochubey

Ca2+-dependent transmitter release is the most important signaling mechanism for fast information transfer between neurons. Transmitter release takes places at highly specialized active zones with sub-micrometer dimension, which contain the molecular machi ...

Elsevier2012

Nigrostriatal overabundance of alpha-synuclein leads to decreased vesicle density and deficits in dopamine release that correlate with reduced motor activity

Patrick Aebischer, Marco Cantoni, Jean-Charles Bensadoun, Graham Knott, Safa Mohanna, Ralf Schneggenburger, Özgür Genç, Wojciech Janusz Bobela

alpha-Synuclein (alpha-syn) is a presynaptic protein present at most nerve terminals, but its function remains largely unknown. The familial forms of Parkinson's disease associated with multiplications of the alpha-syn gene locus indicate that overabundanc ...

Springer-Verlag2012

Regulation of transmitter release by Ca2+ and synaptotagmin: insights from a large CNS synapse

Ralf Schneggenburger, Olexiy Kochubey

Transmitter release at synapses is driven by elevated intracellular Ca2+ concentration (Ca2+) near the sites of vesicle fusion. Ca2+ signals of profoundly different amplitude and kinetics drive the phasic release component during a presynaptic ac ...

2011

Synaptotagmin increases the dynamic range of synapses by driving Ca2+ - evoked release and by clamping a near-linear remaining Ca2+ sensor

Ralf Schneggenburger, Olexiy Kochubey

Ca2+-evoked transmitter release shows a high dynamic range over spontaneous release. We investigated the role of the Ca2+ sensor protein, Synaptotagmin2 (Syt2), in both spontaneous and Ca2+-evoked release under direct control of presynaptic Ca2+, usin ...

2011

Developmental expression of Synaptotagmin isoforms in single calyx of Held-generating neurons

Heike Runne, Ralf Schneggenburger, Le Xiao, Yunyun Han, Olexiy Kochubey, Heather Mary Elizabeth Murray

The large glutamatergic calyx of Held synapse in the auditory brainstem has become a powerful model for studying transmitter release mechanisms, but the molecular bases of presynaptic function at this synapse are not well known. Here, we have used single-c ...

2010

Interaction between Facilitation and Depression at a Large CNS Synapse Reveals Mechanisms of Short-Term Plasticity

Ralf Schneggenburger, Olexiy Kochubey, Martin Guillermo Mueller

The two fundamental forms of short-term plasticity, short-term depression and facilitation, coexist at most synapses, but little is known about their interaction. Here, we studied the interplay between short-term depression and facilitation at calyx of Hel ...

Society for Neuroscience2010

Developmental regulation of the intracellular Ca2+ sensitivity of vesicle fusion and Ca2+-secretion coupling at the rat calyx of Held

Ralf Schneggenburger, Yunyun Han, Olexiy Kochubey

Developmental refinement of synaptic transmission can occur via changes in several pre- and postsynaptic factors, but it has been unknown whether the intrinsic Ca2+ sensitivity of vesicle fusion in the nerve terminal can be regulated during development. Us ...

2009

Exocytosis: Ca2+-Sensitivity

Ralf Schneggenburger

Regulated fusion of small synaptic vesicles and the ensuing release of neurotransmitter at nerve terminals underlies chemical synaptic transmission between neurons. This process of exocytosis is initiated by an increase in the intracellular Ca2+ concentrat ...

Elsevier2009

A limited contribution of Ca2+ current facilitation to paired-pulse facilitation of transmitter release at the rat calyx of Held

Ralf Schneggenburger, Martin Guillermo Mueller

Recent studies have suggested that transmitter release facilitation at synapses is largely mediated by presynaptic Ca2+ current facilitation, but the exact contribution of Ca2+ current facilitation has not been determined quantitatively. Here, we determine ...

2008

Phorbol esters modulate spontaneous and Ca2+-evoked transmitter release via acting on both munc13 and protein kinase C

Ralf Schneggenburger, Natalya Korogod

Diacylglycerol (DAG) and phorbol esters strongly potentiate transmitter release at synapses by activating protein kinase C (PKC) and members of the Munc13 family of presynaptic vesicle priming proteins. This PKC/Munc13 pathway has emerged as a crucial regu ...

Society for Neuroscience2008

The calyx of Held

Ralf Schneggenburger

Springer, Springer-Verlag2006

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