共 51 条
Stimulation of the EAAT4 glutamate transporter by SGK protein kinase isoforms and PKB
被引:39
作者:

Böhmer, C
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h-index: 0
机构: Univ Tubingen, Dept Physiol, Tubingen, Germany

Philippin, M
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h-index: 0
机构: Univ Tubingen, Dept Physiol, Tubingen, Germany

Rajamanickam, J
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h-index: 0
机构: Univ Tubingen, Dept Physiol, Tubingen, Germany

Mack, A
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h-index: 0
机构: Univ Tubingen, Dept Physiol, Tubingen, Germany

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Palmada, M
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h-index: 0
机构: Univ Tubingen, Dept Physiol, Tubingen, Germany

Lang, F
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h-index: 0
机构:
Univ Tubingen, Dept Physiol, Tubingen, Germany Univ Tubingen, Dept Physiol, Tubingen, Germany
机构:
[1] Univ Tubingen, Dept Physiol, Tubingen, Germany
[2] Univ Tubingen, Dept Anat, Tubingen, Germany
[3] Australian Natl Univ, Div Biochem & Mol Biol, Canberra, ACT, Australia
关键词:
cerebellar Purkinje cells;
EAAT4;
glutamate transport;
neuroexcitotoxicity;
PKB;
SGK;
dehydration;
D O I:
10.1016/j.bbrc.2004.09.193
中图分类号:
Q5 [生物化学];
Q7 [分子生物学];
学科分类号:
071010 ;
081704 ;
摘要:
The serum and glucocorticoid inducible kinase (SGK) 1 is expressed in brain tissue and upregulated by ischemia, neuronal excitation, and dehydration. The present study has been performed to elucidate the expression of SGK1 in cerebellar Purkinje cells and to explore whether it influences the colocalized glutamate transporter EAAT4. Intense SGK1 staining was observed in Purkinje cells following 48 h of water deprivation. The kinase activates glutamate induced current (I-GLU) in Xenopus oocytes heterologously expressing EAAT4, an effect mimicked by its isoforms SGK2, 3 and PKB. I-GLU was decreased by the ubiquitin ligase Nedd4-2, an effect partially but not completely reversed by additional coexpression of the SGK kinase isoforms or PKB. According to immunohistochemistry EAAT4 protein abundance in the cell membrane was enhanced by SGK1 and decreased by Nedd4-2. In conclusion, SGK1 expression is upregulated by ischemia, excitation, and dehydration in cerebellar Purkinje cells. The upregulation of SGK1 may serve to stimulate EAAT4 and thus to reduce neuroexcitotoxicity. (C) 2004 Elsevier Inc. All rights reserved.
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页码:1242 / 1248
页数:7
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