Publications related to Exocytosis

Cholesterol-Containing Liposomes Decorated With Au Nanoparticles as Minimal Tunable Fusion Machinery

Francesco Stellacci, Paulo Henrique Jacob Silva, Ester Canepa, Giulia Rossi

Membrane fusion is essential for the basal functionality of eukaryotic cells. In physiological conditions, fusion events are regulated by a wide range of specialized proteins, operating with finely tuned local lipid composition and ionic environment. Fusog ...

WILEY-V C H VERLAG GMBH2023

Real-time monitoring of single-cell secretion with a high-throughput nanoplasmonic microarray

Hatice Altug, Xiaokang Li, Yen-Cheng Liu, Saeid Ansaryan, Eduardo Romero Arvelo

Proteins secreted by cells play significant roles in mediating many physiological, developmental, and pathological processes due to their functions in intra/intercellular communication and signaling. Conventional end-point methods are insufficient for unde ...

Elsevier2022

Cell-type-specific nicotinic input disinhibits mouse barrel cortex during active sensing

Carl Petersen, Sylvain Crochet, Célia Roxane Gasselin, Benoît Hohl

Fast synaptic transmission relies upon the activation of ionotropic receptors by neurotransmitter release to evoke postsynaptic potentials. Glutamate and GABA play dominant roles in driving highly dynamic activity in synaptically connected neuronal circuit ...

CELL PRESS2021

Calcium-Mediated Liposome Fusion to Engineer Giant Lipid Vesicles with Cytosolic Proteins and Reconstituted Mammalian Proteins

Leo Scheller

Giant unilamellar lipid vesicles (GUVs) are widely used as model membrane systems and provide an excellent basis to construct artificial cells. To construct more sophisticated artificial cells, proteins-in particular membrane proteins-need to be incorporat ...

2020

Calcium-triggered fusion of lipid membranes is enabled by amphiphilic nanoparticles

Francesco Stellacci, Ye Yang, Ahmet Bekdemir, Zekiye Pelin Güven

Lipid membrane fusion is an essential process for a number of critical biological functions. The overall process is thermodynamically favorable but faces multiple kinetic barriers along the way. Inspired by nature's engineered proteins such as SNAP recepto ...

National Academy of Sciences2020

Estimating the Readily-Releasable Vesicle Pool Size at Synaptic Connections in the Neocortex

Henry Markram, Eilif Benjamin Muller, Srikanth Ramaswamy, Rodrigo de Campos Perin, Giuseppe Chindemi, Natali Barros Zulaica

Previous studies based on the 'Quantal Model' for synaptic transmission suggest that neurotransmitter release is mediated by a single release site at individual synaptic contacts in the neocortex. However, recent studies seem to contradict this hypothesis ...

2019

ER-to-lysosome-associated degradation of proteasome-resistant ATZ polymers occurs via receptor-mediated vesicular transport

Maurizio Molinari, Paolo Paganetti

Maintenance of cellular proteostasis relies on efficient clearance of defective gene products. For misfolded secretory proteins, this involves dislocation from the endoplasmic reticulum (ER) into the cytosol followed by proteasomal degradation. However, po ...

2018

EVIR: Chimeric receptors that enhance dendritic cell cross-dressing with tumor antigens

Michele De Palma, Mario Leonardo Squadrito, Chiara Cianciaruso, Sarah Kate Hansen

We describe a lentivirus-encoded chimeric receptor, termed extracellular vesicle (EV)-internalizing receptor (EVIR), which enables the selective uptake of cancer-cell-derived EVs by dendritic cells (DCs). The EVIR enhances DC presentation of EV-associated ...

2018

Membrane scission driven by the PROPPIN Atg18

Hilal Lashuel, Bruno Claude Daniel Fauvet, Andreas Mayer

Sorting, transport, and autophagic degradation of proteins in endosomes and lysosomes, as well as the division of these organelles, depend on scission of membrane-bound tubulo-vesicular carriers. How scission occurs is poorly understood, but family protein ...

Nature Publishing Group2017

EspC forms a filamentous structure in the cell envelope of Mycobacterium tuberculosis and impacts ESX-1 secretion

Stewart Cole, Claudia Sala, Jan Lars Rybniker, Ye Lou

Pathogenicity of Mycobacterium tuberculosis (M. tb) is mediated by the ESX-1 secretion system, which exports EsxA and EsxB, the major virulence factors that are co-secreted with EspA and EspC. Functional information about ESX-1 components is scarce. Here, ...

2017

Proteolytic processing of the synaptic cell adhesion molecule neurexin-3beta and the neurobiological functions of the resulting cleavage products

Magda Maria Palczynska

Neurexins are key synaptic cell adhesion molecules involved in synapse specification and maturation. They couple synaptic activity and cell adhesion to regulate activity-dependent synapse development. Recently, neurexin processing by alpha- and gamma- secr ...

EPFL2016

Semisynthetic and in Vitro Phosphorylation of Alpha-Synuclein at Y39 Promotes Functional Partly Helical Membrane-Bound States Resembling Those Induced by PD Mutations

Hilal Lashuel, Bruno Claude Daniel Fauvet, Anne-Laure Mahul Mellier, Carole Desobry, Farah El Turk, Ana Jovicic

Alpha-synuclein is a presynaptic protein of poorly understood function that is linked to both genetic and sporadic forms of Parkinson's disease. We have proposed that alpha-synuclein may function specifically at synaptic vesicles docked at the plasma membr ...

Amer Chemical Soc2016

Membrane invagination induced by Shiga toxin B-subunit: from molecular structure to tube formation

Julian Charles Shillcock

The bacterial Shiga toxin is composed of an enzymatically active A-subunit, and a receptor-binding homopentameric B-subunit (STxB) that mediates intracellular toxin trafficking. Upon STxB-mediated binding to the glycolipid globotriaosylceramide (Gb3) at th ...

Royal Society of Chemistry2016

Ultrastructural analysis of adult mouse neocortex comparing aldehyde perfusion with cryo fixation

Carl Petersen, Graham Knott, Natalya Korogod

Analysis of brain ultrastructure using electron microscopy typically relies on chemical fixation. However, this is known to cause significant tissue distortion including a reduction in the extracellular space. Cryo fixation is thought to give a truer repre ...

Elife Sciences Publications Ltd2015

Molecular mechanisms governing Ca2+ regulation of evoked and spontaneous release

Ralf Schneggenburger

The relationship between transmitter release evoked by action potentials and spontaneous release has fascinated neuroscientists for half a century, and separate biological roles for spontaneous release are emerging. Nevertheless, separate functions for spo ...

2015

An Exclusion Zone for Ca2+ Channels around Docked Vesicles Explains Release Control by Multiple Channels at a CNS Synapse

Henry Markram, Ralf Schneggenburger, Olexiy Kochubey, Felix Schürmann, Yunyun Han, Daniel Keller, Zsolt Norbert Babai

The spatial arrangement of Ca2+ channels and vesicles remains unknown for most CNS synapses, despite of the crucial importance of this geometrical parameter for the Ca2+ control of transmitter release. At a large model synapse, the calyx of Held, transmitt ...

Public Library Science2015

Compartmentalization of GABA synthesis by GAD67 differs between pancreatic beta cells and neurons

Steinunn Baekkeskov Hanahan, Chiara Cianciaruso, Miriella Carmela Pasquier, Edward Allen Phelps

The inhibitory neurotransmitter GABA is synthesized by the enzyme glutamic acid decarboxylase (GAD) in neurons and in pancreatic β-cells in islets of Langerhans where it functions as a paracrine and autocrine signaling molecule regulating the function of i ...

Public Library of Science2015

Purification of centrosomes from mammalian cell lines

Paul Guichard

Centrosomes act as the main microtubule-organizing centre of animal cells and play critical roles in the cell, such as mitotic spindle organization, cell polarity, and motility. They are composed of two barrel-shaped structures, the centrioles, surrounded ...

Elsevier Academic Press Inc2015

Endosomes: Guardians Against [Ru(Phen)3]2+ Photo-action In Endothelial Cells During In Vivo pO2 Detection?

Georges Wagnières, Veronika Huntosova

Phototoxicity is a side-effect of in vitro and in vivo oxygen partial pressure (pO(2)) detection by luminescence lifetime measurement methods. Dichlorotris(1,10-phenanthroline)-ruthenium(II) hydrate (Ru(Phen)(3)) is a water soluble pO(2) probe associ ...

Royal Soc Chemistry2014

Activation and Spatial Organization of the Adenosine A2A Receptor in Supported Plasma Membrane Sheets

Sophie Roizard

G protein-coupled receptors (GPCRs) are ubiquitous mediators of signal transduction across cell membranes and constitute a very important class of therapeutic targets. The main mechanisms involving GPCR activation and signal transduction to the cell interi ...

EPFL2013