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J. Biol. Chem., Vol. 276, Issue 22, 18657-18664, June 1, 2001
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Inhibits Aquaporin 5 Expression in
Mouse Lung Epithelial Cells*
§,
,
From the Aquaporin 5 (AQP5), the major water
channel expressed in alveolar, tracheal, and upper bronchial
epithelium, is significantly down-regulated during pulmonary
inflammation and edema. The mechanisms that underlie this decrease in
AQP5 levels are therefore of considerable interest. Here we show that
AQP5 expression in cultured lung epithelial cells is decreased 2-fold
at the mRNA level and 10-fold at the protein level by the
proinflammatory cytokine tumor necrosis factor
Department of Molecular Genetics,
Biochemistry, and Microbiology, University of Cincinnati College of
Medicine, Cincinnati, Ohio 45267-0524 and the ¶ Division of
Pulmonary Biology, Children's Hospital Medical Center,
Cincinnati, Ohio 45229
(TNF-
). Treatment
of murine lung epithelial cells (MLE-12) with TNF-
results in a
concentration- and time-dependent decrease in AQP5 mRNA
and protein expression. Activation of the p55 TNF-
receptor (TNFR1)
with an agonist antibody is sufficient to cause decreased AQP5
expression, demonstrating that the TNF-
effect is mediated through
TNFR1. Inhibition of nuclear factor
B (NF-
B) translocation to the
nucleus blocks the effect of TNF-
on AQP5 expression, indicating
that activation of NF-
B is required, whereas inhibition of
extracellular signal-regulated or p38 mitogen-activated protein
kinases showed no effect. These data show that TNF-
decreases AQP5
mRNA and protein expression and that the molecular pathway for this
effect involves TNFR1 and activated NF-
B. The ability of
inflammatory cytokines to decrease aquaporin expression may help
explain the connection between inflammation and edema.
To whom correspondence should be addressed: Dept. of Molecular
Genetics, Biochemistry, and Microbiology, University of Cincinnati College of Medicine, 231 Albert Sabin Way, 3110 MSB, P. O. Box 670524, Cincinnati, OH 45267-0524. Tel.: 513-558-5534; Fax:
513-558-1885; E-mail: Anil.Menon@UC.edu.
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