Lactic acid increases aquaporin 4 expression on the cell membrane of cultured rat astrocytes

被引：67

作者：

Morishima, Tetsuro ^{[1
]}

Aoyama, Mineyoshi ^{[2
]}

Iida, Yuko ^{[1
]}

Yamamoto, Naoki ^{[3
]}

Hirate, Hiroyuki ^{[1
]}

Arima, Hajime ^{[1
]}

Fujita, Yoshihito ^{[1
]}

Sasano, Hiroshi ^{[1
]}

Tsuda, Takako ^{[1
]}

Katsuya, Hirotada ^{[1
]}

Asai, Kiyofumi ^{[2
]}

Sobue, Kazuya ^{[1
]}

机构：

[1] Nagoya City Univ, Grad Sch Med Sci, Dept Anesthesiol & Med Crisis Management, Mizuho Ku, Nagoya, Aichi 4678601, Japan

[2] Nagoya City Univ, Grad Sch Med Sci, Dept Mol Neurobiol, Mizuho Ku, Nagoya, Aichi 4678601, Japan

[3] Natl Ctr Geriatr & Gerontol, Natl Inst Longev Sci, Dept Alzhheimers Dis Res, Morioka, Obu 4748522, Japan

来源：

NEUROSCIENCE RESEARCH | 2008年 / 61卷 / 01期

关键词：

astrocytes; aquaporin; lactic acid; acidosis;

D O I：

10.1016/j.neures.2008.01.005

中图分类号：

Q189 [神经科学];

学科分类号：

071006 ;

摘要：

The water channel protein aquaporin (AQP) may play roles in the homeostasis of water content in the brain and brain edema. One possible mechanism of brain edema is glial swelling due to lactic acidosis associated with ischemia. Here, we investigated the effect of lactic acid on the expression and cellular distribution of AQP 4 in cultured rat astrocytes. After 24 h of incubation, the AQP4 expression level increased maximally with 35 mM lactic acid. The AQP4 expression levels also increased with hydrochloric acid or acetic acid. In contrast, with sodium lactate, the AQP4 levels did not increase. The increase in AQP4 expression level occurred without a significant increase in AQP4 mRNA expression level by lactic acid. Under the conditions of de novo protein synthesis inhibition with cycloheximide, lactic acid increased the AQP4 expression level. Furthermore, lactic acid increased the AQP4 expression level on the cell surface of the astrocytes, as determined by a cell surface biotinylation assay and immunocytochemical examination. The increase in AQP4 expression level on the cell membrane of astrocytes induced by lactic acid may be a new regulation mechanism of AQP4 in the brain. (c) 2008 Elsevier Ireland Ltd and the Japan Neuroscience Society. All rights reserved.

引用

页码：18 / 26

页数：9

共 33 条

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