Renal Cortical Regulation of Cox-1 and Functionally Related Products in Early Renovascular Hypertension (Rat).
From: Charité Universitätsmedizin Berlin, Institut für Vegetative Anatomie, Philippstr. 12, 10115 Berlin, Germany.
American journal of physiology. Renal physiology
- Publish Date: Nov 2006
- ISSN: 0363-6127
- Volume: 291
- Issue: 5
- Pages: F987-94
- Medium: Print
- Language: English
- Citation (JAMA): Theilig F, Debiec H, Nafz B, et al. Renal Cortical Regulation of Cox-1 and Functionally Related Products in Early Renovascular Hypertension (Rat).. Am. J. Physiol. Renal Physiol. Nov 2006;291:F987-94
Abstract
Renal volume regulation is modulated by the action of cyclooxygenases (COX) and the resulting generation of prostanoids. Epithelial expression of COX isoforms in the cortex directs COX-1 to the distal convolutions and cortical collecting duct, and COX-2 to the thick ascending limb. Partly colocalized are prostaglandin E synthase (PGES), the downstream enzyme for renal prostaglandin E(2) (PGE(2)) generation, and the EP receptors type 1 and 3. COX-1 and related components were studied in two kidney-one clip (2K1C) Goldblatt hypertensive rats with combined chronic ANG II or bradykinin B(2) receptor blockade using candesartan (cand) or the B(2) antagonist Hoechst 140 (Hoe). Rats (untreated sham, 2K1C, sham + cand, 2K1C + cand, sham + Hoe, 2K1C + Hoe) were treated to map expression of parameters controlling PGE(2) synthesis. In 2K1C, cortical COX isoforms did not change uniformly. COX-2 changed in parallel with NO synthase 1 (NOS1) expression with a raise in the clipped, but a decrease in the nonclipped side. By contrast, COX-1 and PGES were uniformly downregulated in both kidneys, along with reduced urinary PGE(2) levels, and showed no clear relations with the NO status. ANG II receptor blockade confirmed negative regulation of COX-2 by ANG II but blunted the decrease in COX-1 selectively in nonclipped kidneys. B(2) receptor blockade reduced COX-2 induction in 2K1C but had no clear effect on COX-1. We suggest that in 2K1C, COX-1 and PGES expression may fail to oppose the effects of renovascular hypertension through reduced prostaglandin signaling in late distal tubule and cortical collecting duct.
Mesh Headings (Keywords): Adrenergic beta-Antagonists, Angiotensin II Type 1 Receptor Blockers, Animals, Benzimidazoles, Blood Pressure, Bradykinin, Cyclic GMP, Cyclooxygenase 1, Cyclooxygenase 2, Dinoprostone, Disease Models, Animal, Hypertension, Renovascular, Kidney Cortex, Kidney Tubules, Collecting, Kidney Tubules, Distal, Loop of Henle, Male, Membrane Proteins, Nitric Oxide, Nitric Oxide Synthase, Rats, Rats, Sprague-Dawley, Receptors, Prostaglandin E, Surgical Instruments, Tetrazoles
Check for Full Text / PubMed Unique Identifier (PMID): 16788145
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