Source:http://linkedlifedata.com/resource/pubmed/id/10484329
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
3 Pt 1
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pubmed:dateCreated |
1999-10-28
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pubmed:abstractText |
Cell shrinkage phosphorylates and activates the Na-K-2Cl cotransporter (NKCC1), indicating the presence of a volume-sensitive protein kinase. To identify this kinase, extracts of normal and shrunken aortic endothelial cells were screened for phosphorylation of NKCC1 fusion proteins in an in-the-gel kinase assay. Hypertonic shrinkage activated a 46-kDa kinase that phosphorylated an NH2-terminal fusion protein, with weaker phosphorylation of a COOH-terminal fusion protein. This cytosolic kinase was activated by both hypertonic and isosmotic shrinkage, indicating regulation by cell volume rather than osmolarity. Subsequent studies identified this kinase as c-Jun NH2-terminal kinase (JNK). Immunoblotting revealed increased JNK activity in shrunken cells; there was volume-sensitive phosphorylation of NH2-terminal c-Jun fusion protein; immunoprecipitation of JNK from shrunken cells but not normal cells phosphorylated NKCC1 in gel kinase assays; and treatment of cells with tumor necrosis factor, a known activator of JNK, mimicked the effect of hypertonicity. We conclude that JNK is a volume-sensitive kinase in endothelial cells that phosphorylates NKCC1 in vitro. This is the first demonstration of a volume-sensitive protein kinase capable of phosphorylating a volume-regulatory transporter.
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pubmed:grant | |
pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/Carrier Proteins,
http://linkedlifedata.com/resource/pubmed/chemical/JNK Mitogen-Activated Protein...,
http://linkedlifedata.com/resource/pubmed/chemical/Mitogen-Activated Protein Kinases,
http://linkedlifedata.com/resource/pubmed/chemical/Sodium-Potassium-Chloride Symporters
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pubmed:status |
MEDLINE
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pubmed:month |
Sep
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pubmed:issn |
0002-9513
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
277
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
C425-31
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pubmed:dateRevised |
2009-11-19
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pubmed:meshHeading |
pubmed-meshheading:10484329-Animals,
pubmed-meshheading:10484329-Aorta,
pubmed-meshheading:10484329-Carrier Proteins,
pubmed-meshheading:10484329-Cattle,
pubmed-meshheading:10484329-Cells, Cultured,
pubmed-meshheading:10484329-Electrophoresis, Polyacrylamide Gel,
pubmed-meshheading:10484329-Endothelium, Vascular,
pubmed-meshheading:10484329-Immunoblotting,
pubmed-meshheading:10484329-JNK Mitogen-Activated Protein Kinases,
pubmed-meshheading:10484329-Mitogen-Activated Protein Kinases,
pubmed-meshheading:10484329-Phosphorylation,
pubmed-meshheading:10484329-Precipitin Tests,
pubmed-meshheading:10484329-Sodium-Potassium-Chloride Symporters
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pubmed:year |
1999
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pubmed:articleTitle |
JNK is a volume-sensitive kinase that phosphorylates the Na-K-2Cl cotransporter in vitro.
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pubmed:affiliation |
Renal Division, Emory University School of Medicine, Atlanta, Georgia 30322, USA.
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pubmed:publicationType |
Journal Article,
Research Support, U.S. Gov't, P.H.S.
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