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dc.contributor.authorKing, L S
dc.contributor.authorAgre, P
dc.contributor.authorLeitch, V
dc.contributor.authorHoffert, J D
dc.date.accessioned2010-05-06T22:11:03Z
dc.date.available2010-05-06T22:11:03Z
dc.date.issued2000-03-24
dc.identifier.citationJ Biol Chem. 2000 Mar 24;275(12):9070-7. doi: 10.1074/jbc.275.12.9070en_US
dc.identifier.urihttp://jhir.library.jhu.edu/handle/1774.2/34098
dc.description.abstractAquaporin-5 (AQP5) is a water channel protein expressed in lung, salivary gland, and lacrimal gland epithelia. Each of these sites may experience fluctuations in surface liquid osmolarity; however, osmotic regulation of AQP5 expression has not been reported. This study demonstrates that AQP5 is induced by hypertonic stress and that induction requires activation of extracellular signal-regulated kinase (ERK). Incubation of mouse lung epithelial cells (MLE-15) in hypertonic medium produced a dose-dependent increase in AQP5 expression; AQP5 protein peaked by 24 h and returned to baseline levels within hours of returning cells to isotonic medium. AQP5 induction was observed only with relatively impermeable solutes, suggesting an osmotic pressure gradient is required for induction. ERK was selectively activated in MLE-15 cells by hypertonic stress, and inhibition of ERK activation with two distinct mitogen-activated extracellular regulated kinase kinase (MEK) inhibitors, U0126 and PD98059, blocked AQP5 induction. AQP5 induction was also observed in the lung, salivary, and lacrimal glands of hyperosmolar rats, suggesting potential physiologic relevance for osmotic regulation of AQP5 expression. This report provides the first example of hypertonic induction of an extrarenal aquaporin, as well as the first association between mitogen-activated protein kinase signaling and aquaporin expression.en_US
dc.language.isoen_USen_US
dc.publisherAmerican Society for Biochemistry and Molecular Biologyen_US
dc.subjectOsmotic Pressureen_US
dc.subjectMembrane Proteinsen_US
dc.subjectMAP Kinase Signaling Systemen_US
dc.subjectAquaporins/geneticsen_US
dc.titleHypertonic induction of aquaporin-5 expression through an ERK-dependent pathwayen_US
dc.typeArticleen_US


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