کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
3884598 1249482 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hypertonicity stimulates PGE2 signaling in the renal medulla by promoting EP3 and EP4 receptor expression
موضوعات مرتبط
علوم پزشکی و سلامت پزشکی و دندانپزشکی بیماری‌های کلیوی
پیش نمایش صفحه اول مقاله
Hypertonicity stimulates PGE2 signaling in the renal medulla by promoting EP3 and EP4 receptor expression
چکیده انگلیسی

Hypertonicity in the renal medulla stimulates local cyclooxygenase 2 expression, leading to abundant PGE2 production. Here we found that mRNA expression by the PGE2-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 PGE2 signaling in the renal medulla by stimulating cognate receptor and cyclooxygenase 2 expression that likely regulates local hemodynamics and tubular transport.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Kidney International - Volume 75, Issue 3, 1 February 2009, Pages 278–284
نویسندگان
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