Expression of Rat Brain Excitatory Amino Acid Receptors in Xenopus Oocytes

  • Richard A. Lampe
  • Leonard G. Davis
  • Michael J. Gutnick
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 221)


Xenopus laevis oocytes when injected with rat brain mRNA synthesize neuronal receptors that can be analyzed electrophysiologically. After a post-injection incubation period of 24–72 hours, L-glutamic acid, kainic acid and quisqualic acid caused a dose dependent (10–100 μM) depolarization of the oocyte membrane. The voltage and conductance changes associated with kainate activation were distinguishable from those seen for L-glutamate or quisqualate. There was no response to L-aspartate application and an inconsistent response to N-methyl-D-aspartate.

Upon fractionation of the mRNA on sucrose gradients, transcripts greater than 2 Kb in length were obligatory for the synthesis of excitatory amino acid receptors. The electrophysiological response of injected oocytes exposed to L-glutamate was similar to that of native oocytes when exposed to muscarinic agents. This similarity may reflect the activation of the same ionophore and suggests that the active mRNA fraction for glutamate responsiveness either encodes for a binding protein that can be assembled along with native ion channels into the oocyte membrane or encodes for a glutamate binding site with a similar channel.


Acetylcholine Receptor Xenopus Oocyte Excitatory Amino Acid Xenopus Laevis Oocyte Excitatory Amino Acid Receptor 
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Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • Richard A. Lampe
    • 1
  • Leonard G. Davis
    • 1
  • Michael J. Gutnick
    • 1
  1. 1.Neurobiology Group, Medical Products DepartmentE. I. du Pont de Nemours and CompanyWilmingtonUSA

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