Nephron

Physiology: Original Paper

SPAK and OSR1 Sensitivity of Excitatory Amino Acid Transporter EAAT3

Borrás J. · Salker M.S. · Elvira B. · Warsi J. · Fezai M. · Hoseinzadeh Z. · Lang F.

Author affiliations

Department of Physiology I, University of Tübingen, Tubingen, Germany

Keywords: EAAT3Oxidative stress-responsive kinase 1SPS1-related proline/alanine-rich kinaseWith-no-K(Lys)

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Nephron 2015;130:221-228
https://doi.org/10.1159/000433567

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Article / Publication Details

First-Page Preview
Abstract of Physiology: Original Paper

Received: March 26, 2015
Accepted: May 20, 2015
Published online: June 25, 2015
Issue release date: July 2015

Number of Print Pages: 8
Number of Figures: 7
Number of Tables: 0

ISSN: 1660-8151 (Print)
eISSN: 2235-3186 (Online)

For additional information: https://www.karger.com/NEF

Abstract

Background/Aims: Kinases involved in the regulation of epithelial transport include SPAK (SPS1-related proline/alanine-rich kinase) and OSR1 (oxidative stress-responsive kinase 1). SPAK and OSR1 are both regulated by WNK (with-no-K(Lys)) kinases. The present study explored whether SPAK and/or OSR1 influence the excitatory amino acid transporter EAAT3, which accomplishes glutamate and aspartate transport in kidney, intestine and brain. Methods: cRNA encoding EAAT3 was injected into Xenopus laevis oocytes with or without additional injection of cRNA encoding wild-type SPAK, constitutively active T233ESPAK, WNK insensitive T233ASPAK, catalytically inactive D212ASPAK, wild-type OSR1, constitutively active T185EOSR1, WNK insensitive T185AOSR1 and catalytically inactive D164AOSR1. Glutamate-induced current was taken as measure of electrogenic glutamate transport and was quantified utilizing dual electrode voltage clamp. Furthermore, Ussing chamber was employed to determine glutamate transport in the intestine from gene-targeted mice carrying WNK insensitive SPAK (spaktg/tg) and from corresponding wild-type mice (spak+/+). Results: EAAT3 activity was significantly decreased by wild-type SPAK and T233ESPAK, but not by T233ASPAK and D212ASPAK. SPAK decreased maximal transport rate without affecting significantly affinity of the carrier. Similarly, EAAT3 activity was significantly downregulated by wild-type OSR1 and T185EOSR1, but not by T185AOSR1 and D164AOSR1. Again OSR1 decreased maximal transport rate without affecting significantly affinity of the carrier. Intestinal electrogenic glutamate transport was significantly lower in spak+/+ than in spaktg/tg mice. Conclusion: Both, SPAK and OSR1 are negative regulators of EAAT3 activity.

© 2015 S. Karger AG, Basel



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Article / Publication Details

First-Page Preview
Abstract of Physiology: Original Paper

Received: March 26, 2015
Accepted: May 20, 2015
Published online: June 25, 2015
Issue release date: July 2015

Number of Print Pages: 8
Number of Figures: 7
Number of Tables: 0

ISSN: 1660-8151 (Print)
eISSN: 2235-3186 (Online)

For additional information: https://www.karger.com/NEF

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J.B. and M.S.S. contributed equally to this work and thus share first authorship.
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