Kinetic properties of human AMPA-type glutamate receptors expressed in HEK293 cells

Julian Grosskreutz*, Antje Zoerner, Friedrich Schlesinger, Klaus Krampfl, Reinhard Dengler, Johannes Buffer

*Corresponding author for this work
53 Citations (Scopus)


AMPA-type glutamate receptors (AMPAR) display a high variability in functional properties, which determine the time course of excitatory postsynaptic potentials. They are assembled as tetramers of Glu R subunits 1-4 of different splice variants and nuclear edited isoforms. Presently, the kinetics of activation, desensitization and recovery from desensitization of human AMPARs (GluR1,3 and 4 flip and flop, and GluR2 flip and flop in R and G edited forms, respectively) transiently expressed in HEK293 cells were studied with patchclamp techniques and ultra fast agonist application. Activation time constants were identical for all receptors (0.13 ms). The GluR2 flip G variant showed the slowest desensitization (10.8 ms), GluR4 flip the fastest (1.6 ms). Recovery from desensitization varied between 3.1 ms (GluR4 flip) and 178 ms (GluR1 flip). To determine functional interactions between subunits in heteromeric receptors the GluR1 flip and the GluR2 flip R were coexpressed. The time constant of desensitization increased linearly from 2.5 ms (GluR1 flip homomers) to 6.8 ms (GluR2 flip R homomers) with the amount of GluR2 flip R cDNA transfected. Recovery followed a monoexponential time course and had a time constant of 178 ms in GluR1 flip homomeric expression. In all GluR1 flip/GluR2 flip heteromers and in GluR2 flip R homomers desensitization recovered with a time constant of ≈50 ms. Thus, subunit interaction seems likely during recovery but not desensitization. Both parameters might influence the ability of AMPA receptors to mediate glutamate induced chronic excitotoxicity inneurodegenerative diseases.

Original languageEnglish
JournalEuropean Journal of Neuroscience
Issue number6
Pages (from-to)1173-1178
Number of pages6
Publication statusPublished - 03.2003
Externally publishedYes

Research Areas and Centers

  • Centers: Center for Neuromuscular Diseases


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