Tracking Quantum Dot–Tagged Calcium Channels at Vertebrate Photoreceptor Synapses: Retinal Slices and Dissociated Cells. Issue 1 (1st January 2013)

• Record Type: Journal Article
• Authors: Mercer, Aaron J.; Thoreson, Wallace B.
• Editors: Crawley, Jacqueline N.; Gerfen, Charles R.; Rogawski, Michael A.; Sibley, David R.; Skolnick, Phil; Wray, Susan
• Is Part Of: Current protocols in neuroscience. Issue 62:Issue 1(2013)
• Page Start: 2.18.1
• Page End: 2.18.23
• Publication Date: 2013-01-01
• Subjects: single particle tracking -- L‐type calcium channels -- ribbon synapse -- membrane diffusion; Neurosciences -- Laboratory manuals; Neurosciences; Cytological Techniques; Histological Techniques; Nervous System -- anatomy & histology; Neurosciences; Laboratory Manual; Laboratory manuals; 612.8
• DOI: 10.1002/0471142301.ns0218s62
• Languages: English
• ISSNs: 1934-8576

Abstract

Abstract: At synapses in the central nervous system, precisely localized assemblies of presynaptic proteins, neurotransmitter‐filled vesicles, and postsynaptic receptors are required to communicate messages between neurons. Our understanding of synaptic function has been significantly advanced using electrophysiological methods, but the dynamic spatial behavior and real‐time organization of synapses remains poorly understood. In this unit, we describe a method for labeling individual presynaptic calcium channels with photostable quantum dots for single‐particle tracking analysis. We have used this technique to examine the mobility of L‐type calcium channels in the presynaptic membrane of rod and cone photoreceptors in the retina. These channels control release of glutamate‐filled synaptic vesicles at the ribbon synapses in photoreceptor terminals. This technique offers the advantage of providing a real‐time biophysical readout of ion channel mobility and can be manipulated by pharmacological or electrophysiological methods. For example, the combination of electrophysiological and single‐particle tracking experiments has revealed that fusion of nearby vesicles influences calcium channel mobility and changes in channel mobility can influence release. These approaches can also be readily adapted to examine membrane proteins in other systems. Curr. Protoc. Neurosci . 62:2.18.1‐2.18.23. © 2013 by John Wiley & Sons, Inc.