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Properties of two classes of rat brain acidic amino acid receptors induced by distinct mRNA populations in Xenopus oocytes

Fong, Tung Ming and Davidson, Norman and Lester, Henry A. (1988) Properties of two classes of rat brain acidic amino acid receptors induced by distinct mRNA populations in Xenopus oocytes. Synapse, 2 (6). pp. 657-665. ISSN 0887-4476. doi:10.1002/syn.890020613. https://resolver.caltech.edu/CaltechAUTHORS:20201020-070235564

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Abstract

The Xenopus laevis oocyte expression system was used to study the molecular composition of mRNAs encoding acidic amino acid (AA) receptors from rat brain. Xenopus oocytes injected with poly(A) mRNA express two general classes of AA receptors. One class consists of AA‐gated cation channels. Responses are evoked by N‐methyl‐D‐aspartate (NMDA), by kainate, and to a lesser extent by L‐glutamate or quisqualate. The second class of receptor is coupled to an intracellular second messenger pathway activating an oocyte‐encoded Ca²⁺‐activated Cl⁻ conductance. This second messenger‐coupled AA receptor can be activated by L‐glutamate or quisqualate. DL‐2‐amino‐5‐phosphonopentanoic acid and D‐α‐aminohexanedioic acid inhibit the AA‐gated cation conductances activated by NMDA or kainate with different potencies but do not inhibit the second messenger‐coupled AA receptor. Responses to NMDA are enhanced by micromolar level of glycine and are inhibited by Mg²⁺, Zn²⁺, or MK‐801. Dose‐response analysis reveals that the AA‐gated cation conductance activated by kainate requires the binding of two agonist molecules. To study the molecular composition, the mRNAs were size fractionated by denaturing agarose gel electrophoresis. About 20‐fold purification in specific activity (nA/ng of mRNA injected) of mRNAs encoding the second messenger coupled AA receptor was achieved. In contrast, only a slight enrichment of the mRNAs encoding the AA‐gated channel was observed. This suggests that the second messenger coupled AA receptor is encoded by a single size class of mRNA, whereas the AA‐gated cation channel(s) is encoded by multiple species of mRNAs or by mRNAs whose size distribution is heterogeneous.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1002/syn.890020613DOIArticle
ORCID:
AuthorORCID
Lester, Henry A.0000-0002-5470-5255
Additional Information:© 1988 Alan R. Liss, Inc. Manuscript accepted: 25 July 1988; Manuscript received: 09 June 1988.
Subject Keywords:RNA fractionation; Agonist interactions; Antagonist sensitivity
Issue or Number:6
DOI:10.1002/syn.890020613
Record Number:CaltechAUTHORS:20201020-070235564
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20201020-070235564
Official Citation:Fong, T.M., Davidson, N. and Lester, H.A. (1988), Properties of two classes of rat brain acidic amino acid receptors induced by distinct mRNA populations in Xenopus oocytes. Synapse, 2: 657-665. doi:10.1002/syn.890020613
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106152
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Oct 2020 20:45
Last Modified:16 Nov 2021 18:51

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