Abstract:
:Altered aquaporin-4 (AQP4) expression has been reported in brain edema, tumors, muscular dystrophy, and neuromyelitis optica. However, the plasma membrane organization of AQP4 and its interaction with proteins such as the dystrophin-associated protein complex are not well understood. In this study, we used sucrose density gradient ultracentrifugation and 2D blue native/sodium dodecyl sulfate-polyacrylamide gel electrophoresis and showed the expression of several AQP4 multi-subunit complexes (pools) of different sizes, ranging from > 1 MDa to approximately 500 kDa and containing different ratios of the 30/32 kDa AQP4 isoforms, indicative of orthogonal arrays of particles of various sizes. A high molecular weight pool co-purified with dystrophin and beta-dystroglycan and was drastically reduced in the skeletal muscle of mdx3cv mice, which have no dystrophin. The number and size of the AQP4 pools were the same in the kidney where dystrophin is not expressed, suggesting the presence of dystrophin-like proteins for their expression. We found that AQP2 is expressed only in one major pool of approximately 500 kDa, indicating that the presence of different pools is a peculiarity of AQP4 rather than a widespread feature in the AQP family. Finally, in skeletal muscle caveolin-3 did not co-purify with any AQP4 pool, indicating the absence of interaction of the two proteins and confirming that caveolae and orthogonal arrays of particles are two independent plasma membrane microdomains. These results contribute to a better understanding of AQP4 membrane organization and raise the possibility that abnormal expression of specific AQP4 pools may be found in pathological states.
journal_name
J Neurochemjournal_title
Journal of neurochemistryauthors
Nicchia GP,Cogotzi L,Rossi A,Basco D,Brancaccio A,Svelto M,Frigeri Adoi
10.1111/j.1471-4159.2008.05302.xsubject
Has Abstractpub_date
2008-06-01 00:00:00pages
2156-65issue
6eissn
0022-3042issn
1471-4159pii
JNC5302journal_volume
105pub_type
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journal_title:Journal of neurochemistry
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journal_title:Journal of neurochemistry
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journal_title:Journal of neurochemistry
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journal_title:Journal of neurochemistry
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journal_title:Journal of neurochemistry
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doi:10.1111/j.1471-4159.1984.tb06686.x
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journal_title:Journal of neurochemistry
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journal_title:Journal of neurochemistry
pub_type: 杂志文章
doi:10.1111/j.1471-4159.1982.tb04717.x
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journal_title:Journal of neurochemistry
pub_type: 杂志文章
doi:10.1111/j.1471-4159.1991.tb08235.x
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journal_title:Journal of neurochemistry
pub_type: 杂志文章
doi:10.1111/j.1471-4159.1981.tb06318.x
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journal_title:Journal of neurochemistry
pub_type: 杂志文章
doi:10.1111/j.1471-4159.1986.tb13006.x
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pub_type: 杂志文章
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journal_title:Journal of neurochemistry
pub_type: 杂志文章
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journal_title:Journal of neurochemistry
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journal_title:Journal of neurochemistry
pub_type: 杂志文章
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更新日期:1994-06-01 00:00:00
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journal_title:Journal of neurochemistry
pub_type: 杂志文章
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journal_title:Journal of neurochemistry
pub_type: 杂志文章
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更新日期:2011-05-01 00:00:00
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pub_type: 杂志文章
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journal_title:Journal of neurochemistry
pub_type: 杂志文章
doi:10.1046/j.1471-4159.2000.0752563.x
更新日期:2000-12-01 00:00:00
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journal_title:Journal of neurochemistry
pub_type: 杂志文章
doi:10.1111/j.1471-4159.2007.05113.x
更新日期:2008-04-01 00:00:00
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journal_title:Journal of neurochemistry
pub_type: 杂志文章
doi:10.1111/j.1471-4159.1993.tb05843.x
更新日期:1993-01-01 00:00:00
abstract::The possibilities of interference by glycerophosphoryl ethanolamine (GPE) in the estimation of taurine levels in cerebral cortex, midbrain, cerebellum, medullapons, and spinal cord of developing human fetal brain regions were eliminated by hydrolyzing tissue extracts with 6 M HCl. Cysteic acid thus produced was separa...
journal_title:Journal of neurochemistry
pub_type: 杂志文章
doi:10.1111/j.1471-4159.1988.tb10564.x
更新日期:1988-04-01 00:00:00