Abstract:
:Synaptic glutamate receptors play a prominent role in the excitatory neurotransmission in the vertebrate central nervous system. Although elucidation of the functional properties of glutamate receptors using electrophysiologic analyses has yielded important information, methodological and technological limitations have prevented direct measurement of single channel properties of synaptic receptors. Here, we have isolated murine mossy fiber synaptosomes and reconstituted them into small artificial lipid bilayers to characterize the single-channel properties of synaptic alpha amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA)-subtype glutamate receptors. The reconstituted synaptosomal receptors were activated by nanomolar concentrations of AMPA and blocked by a potent AMPA receptor antagonist. The synaptosomal AMPA receptors exhibited channel conductances of 14-56 pS and linear current-voltage relationship. The open and closed dwell time distributions of single channel currents were best described by three exponentials. These channels frequently exhibited burst behavior with long burst duration of approx 60 ms. Experiments with multichannel recordings revealed that steady state probabilities could not be fitted using a binomial distribution, indicating a cooperative channel gating behavior that would account for larger membrane currents. Our findings suggest that isolation, reconstitution into lipid bilayers, and subsequent single channel analysis of synaptosomal receptors is a useful method for investigation of synaptic AMPA receptors.
journal_name
Cell Biochem Biophysjournal_title
Cell biochemistry and biophysicsauthors
Vaithianathan T,Manivannan K,Kleene R,Bahr BA,Dey MP,Dityatev A,Suppiramaniam Vdoi
10.1385/CBB:42:1:075subject
Has Abstractpub_date
2005-01-01 00:00:00pages
75-85issue
1eissn
1085-9195issn
1559-0283pii
CBB:42:1:075journal_volume
42pub_type
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