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Changes in AMPA receptor-spliced variant expression and shift in AMPA receptor spontaneous desensitization pharmacology during cerebellar granule cell maturation in vitro

Abstract

Using appropriate internal standards, quantitative reverse transcripase-polymerase chain reaction (RT-PCR), and cerebellar granule cell (CG) in primary cultures we have quantified the expression of mRNAs encoding for GluR1–4 dl-α-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) receptor subunits during neuronal maturation in vitro. GluR1 is the mRNA that increases during CG maturation; the expression changes of the other GluR mRNAs are minimal and the translation products of these mRNAs change with a similar pattern. During CG maturation, there is an 8- to 10-fold increase in the GluR1 FLOP mRNA and a twofold increase in the expression of FLOP mRNA for GluR4 and GluR4C. The GluR1 FLIP mRNA increases, but by a smaller extent. We found that the GluR2 mRNA is completely edited at its Q/R site during CG maturation. The increase on the expression of GluR1 FLIP and FLOP and of GluR4 FLOP mRNA variants during development is associated with a 10-fold increase in AMPA-mediated Na+ currents and in the increased amplification of this current by 7-chloro-3-methyl-3,4-dihydro-2H-1,2,4benzothiadiazine S-S-dioxide (IDRA21) or by 6-chloro-3,4dihydro-3-(2-norbornen-5-yl)-7-sulfamoyl-1,2,4-benzothiadiazine 1,1 dioxide (cyclothiazide [CT]).

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Drs. Longone and Impagnatiello contributed equally to this work and should be considered co-lead authors.

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Longone, P., Impagnatiello, F., Mienville, JM. et al. Changes in AMPA receptor-spliced variant expression and shift in AMPA receptor spontaneous desensitization pharmacology during cerebellar granule cell maturation in vitro. J Mol Neurosci 11, 23–41 (1998). https://doi.org/10.1385/JMN:11:1:23

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  • DOI: https://doi.org/10.1385/JMN:11:1:23

Index Entries

  • AMPA receptors
  • cerebellar granule cells
  • cyclothiazide
  • IDRA21
  • glutamate receptors