Membrane Trafficking at Synapses
Team Leader : David Perrais
The team (July 2020)
From left to right (without masks): Julie, Lou, Etienne,
David, Silvia, Vincent, May, Zehra, Mathias
Vesicular trafficking is one of the most salient features of synaptic physiology. In the tiny (less than 1 µm wide) chemical synapses, presynaptic vesicles concentrate and release neurotransmitter molecules which bind to post-synaptic receptors. The exocytosis and recycling of synaptic vesicles is a very prominent and essential feature of neuronal physiology that is highly controlled in time and space. Moreover, post-synaptic membrane trafficking, although not as prominent quantitatively, is pivotal for the maintenance of signal transduction complexes supporting synaptic transmission and plasticity. Most of our knowledge about synapse physiology comes from studying glutamatergic synapses which represent the majority of synapses in the brain. Nevertheless, other types of synapses, such as neuromodulatory dopaminergic synapses, could have a very different molecular composition and operate in a different way. However, because they represent a small minority of synapses formed from a very small number of neurons, their analysis has been difficult through classical cellular and molecular methods.
Our goal in the team is to use the most advanced fluorescence imaging techniques together with refined purification of synaptic elements (synaptosomes) to address the mechanisms regulating synapse function through membrane trafficking events in normal brain physiology or in the course of disease. To achieve this goal, we use, on top of the standard techniques of the modern neuroscience lab (molecular biology, biochemistry, imaging, electrophysiology), two unique expertise developed by the two PIs: first, with David Perrais, we develop methods to detect individual exocytosis and endocytosis events with pH sensitive fluorophores and perform quantitative imaging. Second, with Etienne Herzog, we purify synaptosomes from adult animals with fluorescence activated synaptosome sorting (FASS), which enables powerful proteomics, transcriptomics and functional approaches.
Altogether, we aim at identifying new pathways in specific synapses and test their relevance for synaptic nanostructure and function in the normal and diseased brain.
MemTraS: A new team at IINS
"MemTraS - Membrane traffic at synapses" is a new team recently born at IINS. The leader, David Perrais, presents the research axis:
Our goal in the team is to study the mechanisms of synapse function. We focus on membrane trafficking events, exocytosis and endocytosis, in normal brain physiology or in the course of disease. Indeed, membrane trafficking is essential in both sides of the synapse. The presynaptic element is filled with synaptic vesicles which fuse at the active zone to release neurotransmitter molecules, one of the defining features of synaptic transmission. After fusion, vesicles are very quickly and efficiently recycled to cope with neuronal activity. At the post-synaptic side, post-synaptic receptors are going through cycles of endocytosis and recycling, which is essential to regulate synaptic transmission and plasticity. We want to analyse how these processes are organized in space and time. Finally, we are not only interested in canonical synapses, such as cortical glutamatergic synapses, but also in rare and much less understood synapse populations such as neuromodulatory dopamine synapses.
To tackle these issues, we combine two types of expertise mastered by the researchers of the team, myself and Etienne Herzog. I bring electrophysiology combined with the most advanced fluorescence imaging techniques to detect and characterize individual exocytosis and endocytosis events in living cells, while Etienne brings his method of purification of synaptosomes from adult animals with fluorescence activated synaptosome sorting which enables powerful proteomics, transcriptomics and functional approaches. Altogether we aim at identifying new principles of organization in specific synapses and test their relevance for synaptic function in the normal and diseased brain.
The members of the team being formed in January 2020 are Lou Bouit, Silvia Sposini, Marlene Pfeffer, Etienne Herzog, May Bakr and David Perrais.
- More details on the Bordeaux Neurocampus website here.
- Contact: David Perrais
MemTraS Team crew is expanding
We are pleased to welcome several new members:
Sarka Jelinkova - Post Doctoral Fellow - Expert in Stem cell biology and molecular biology - Ph.D U Brno - Czech Republic
Nathan Hoareau - Master 2 rotation student - Ecole Supérieure de Chimie Organique et Minerale
Juan Manuel Defauce Garcia - Master 1 NeuroBIM rotation student - Université de Bordeaux
Khadija Inam - Master 1 NeuroBIM rotation student - Université de Bordeaux
Fantine Morinière - Technician degree rotation student - BTS Biotechnologies - Lycée Saint-Louis - Bordeaux
Welcome to all of them!
« Technical Staff »
|ANGIBAUD Julie||Technical firstname.lastname@example.org||+33533514748|
|BOUIT Lou||Technical email@example.com||+33533514861|
« Postdoc »
« PhD student »
|LAPIOS Paul||PhD firstname.lastname@example.org||+33533514779|
« Student »
|DAFAUCE GARCIA Juan Manuel||Studentemail@example.com||+33533514700|
« Alumni & Guests »
Anne-Sophie Hafner (Guest, 2017-2018)
Magalie Martineau (post-doc, 2015-2019 - Now Research and Development specialist at EIF Innovation, Paris, France)
Léa Claverie (PhD student, 2015-2019 - Now Project Manager at Euroquality, Bordeaux, France)
Florencia Angelo (Lab Manager, 2015-2020)
Thi Nhu Ngoc Van (post-doc, 2014-2016 - Now Project Manager at Sys2dia, Montpellier, France)
Julia Krapivkina (PhD student, 2012-2016 - Now Project Manager at Assystem, Paris, France)
Xiao Min Zhang (PhD Student, 2012-2016 - Now Assistant Prof at Sun Yat Sen University - China)
Morgane Rosendale (PhD student and post-doc, 2011-2016 - Now post-doctoral fellow at Institute for Molecular Sciences, Bordeaux)
Damien Jullié (PhD student, 2008-2012 - Now Research Specialist at UCSF Weill Institute for Neurosciences, San Francisco, USA)