Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/14401
Title: Ensemble and single particle fluorimetric techniques in concerted action to study the diffusion and aggregation of the glycine receptor alpha 3 isoforms in the cell plasma membrane
Authors: NOTELAERS, Kristof 
SMISDOM, Nick 
Rocha, Susana
JANSSEN, Daniel 
Meier, Jochen C.
RIGO, Jean-Michel 
Hofkens, Johan
AMELOOT, Marcel 
Issue Date: 2012
Publisher: ELSEVIER SCIENCE BV
Source: BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES, 1818 (12), p. 3131-3140
Abstract: The spatio-temporal membrane behavior of glycine receptors (GlyRs) is known to be of influence on receptor homeostasis and functionality. In this work, an elaborate fluorimetric strategy was applied to study the GlyR alpha 3K and L isoforms. Previously established differential clustering, desensitization and synaptic localization of these isoforms imply that membrane behavior is crucial in determining GlyR alpha 3 physiology. Therefore diffusion and aggregation of homomeric alpha 3 isoform-containing GlyRs were studied in HEK 293 cells. A unique combination of multiple diffraction-limited ensemble average methods and subdiffraction single particle techniques was used in order to achieve an integrated view of receptor properties. Static measurements of aggregation were performed with image correlation spectroscopy (ICS) and, single particle based, direct stochastic optical reconstruction microscopy (dSTORM). Receptor diffusion was measured by means of raster image correlation spectroscopy (RICS), temporal image correlation spectroscopy (TICS), fluorescence recovery after photobleaching (FRAP) and single particle tracking (SPT). The results show a significant difference in diffusion coefficient and cluster size between the isoforms. This reveals a positive correlation between desensitization and diffusion and disproves the notion that receptor aggregation is a universal mechanism for accelerated desensitization. The difference in diffusion coefficient between the clustering GlyR alpha 3L and the non-clustering GlyR alpha 3K cannot be explained by normal diffusion. SPT measurements indicate that the alpha 3L receptors undergo transient trapping and directed motion, while the GlyR alpha 3K displays mild hindered diffusion. These findings are suggestive of differential molecular interaction of the isoforms after incorporation in the membrane. (C) 2012 Elsevier B.V. All rights reserved.
Notes: [Notelaers, Kristof; Smisdom, Nick; Janssen, Daniel; Rigo, Jean-Michel; Ameloot, Marcel] Transnat Univ Limburg, Sch Life Sci, B-3590 Diepenbeek, Belgium. [Notelaers, Kristof; Smisdom, Nick; Janssen, Daniel; Rigo, Jean-Michel; Ameloot, Marcel] Hasselt Univ, Biomed Res Inst, B-3590 Diepenbeek, Belgium. [Notelaers, Kristof; Rocha, Susana; Hofkens, Johan] Katholieke Univ Leuven, Dept Chem, Lab Photochem & Spect, B-3001 Heverlee, Belgium. [Meier, Jochen C.] Max Delbruck Ctr Mol Med, RNA Editing & Hyperexcitabil Disorders Grp, D-13092 Berlin, Germany. marcel.ameloot@uhasselt.be
Keywords: Glycine receptor; Alpha3 isoforms; Nanoscopy; Single particle; Ensemble average; Anomalous diffusion;Biochemistry & Molecular Biology; Biophysics; glycine receptor; alpha3 isoforms; nanoscopy; single partcle; ensemble average; anomalous diffusion
Document URI: http://hdl.handle.net/1942/14401
ISSN: 0005-2736
e-ISSN: 1879-2642
DOI: 10.1016/j.bbamem.2012.08.010
ISI #: 000309801500025
Category: A1
Type: Journal Contribution
Validations: ecoom 2013
Appears in Collections:Research publications

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