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Author

Kwon, H. Moo
Inflammation and Kidney Disorder Lab
Research Interests
  • TonEBP, Obesity, Cancer, Chronic inflammatory diseases, Brain disorder, Kidney disorders, Genomic instability

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Hypertonicity stimulates PGE(2) signaling in the renal medulla by promoting EP3 and EP4 receptor expression

Cited 5 times inthomson ciCited 3 times inthomson ci
Title
Hypertonicity stimulates PGE(2) signaling in the renal medulla by promoting EP3 and EP4 receptor expression
Author
Kim, Jeong-AhSheen, Mee RieSang, Do LeeJung, Ju-YoungKwon, H. Moo
Keywords
AQP2; cAMP; Cell survival; Cyclooxygenase 2; NKCC2; Renal blood flow
Issue Date
200902
Publisher
NATURE PUBLISHING GROUP
Citation
KIDNEY INTERNATIONAL, v.75, no.3, pp.278 - 284
Abstract
Hypertonicity in the renal medulla stimulates local cyclooxygenase 2 expression, leading to abundant PGE(2) production. Here we found that mRNA expression by the PGE(2)-activated G-protein-coupled receptors, EP3 and EP4 in the renal medulla was decreased by furosemide treatment, a procedure that reduces medullary hypertonicity. When HepG2 cells were cultured in hypertonic conditions by addition of salt or sorbitol, EP3 expression was induced. A specific EP3 agonist inhibited cAMP production, indicating receptor functionality, and this led to a substantial increase in cell survival in hypertonic media. Survival was independent of the SLC5A3 inositol transporter and aldose reductase expression, suggesting that EP3 promoted cell survival under hypertonic conditions independent of cellular organic osmolyte accumulation. Reduced cAMP production did not contribute to increased survival. EP4 expression was stimulated by hypertonicity in MDCK and HepG2 cells, which was associated with increased cAMP production in response to an EP4 agonist. Our study shows that local hypertonicity promotes PGE(2) signaling in the renal medulla by stimulating cognate receptor and cyclooxygenase 2 expression that likely regulates local hemodynamics and tubular transport.
URI
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DOI
http://dx.doi.org/10.1038/ki.2008.498
ISSN
0085-2538
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