Abstract |
We hypothesized that the downregulation of Cyp2c by tumor necrosis factor ( TNF) alpha contributes to hypertension and renal injury in salt-sensitive angiotensin hypertension. Male Sprague-Dawley rats were fed a high- salt diet (8% NaCl), and osmotic minipumps were implanted to deliver angiotensin II for 14 days. Rats were divided into 3 groups: high salt, angiotensin high salt, and angiotensin high salt administered the TNF-alpha blocker, etanercept. Arterial pressure increased from 94+/-5 to 148+/-7 mm Hg during week 1 in the angiotensin high- salt group, whereas etanercept slowed blood pressure elevation during the first week in the treated group (90+/-2 to 109+/-6 mm Hg). After 2 weeks, arterial pressure increased to 156+/-11 mm Hg in the angiotensin high- salt group and 141+/-6 mm Hg in the etanercept-treated group. Albuminuria and proteinuria were significantly elevated in angiotensin high- salt rats and were reduced in the etanercept-treated rats. Urinary monocyte chemoattractant protein-1 excretion significantly increased in the angiotensin high- salt group (275+/-47 versus 81+/-19 ng/day) and was decreased in the etanercept-treated group (153+/-31 ng/day). Angiotensin high- salt rats also had a significant increase in renal monocyte/macrophage infiltration, and this was again attenuated by etanercept treatment. Renal expression of Cyp2c23 decreased, whereas renal epoxide hydrolase expression increased in angiotensin high- salt rats. Etanercept treatment increased Cyp2c23 expression and lowered epoxide hydrolase expression. These data suggest that TNF-alpha contributes to downregulation of Cyp2c23, blood pressure regulation, and renal injury in angiotensin high- salt hypertension.
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Authors | Ahmed A Elmarakby, Jeffrey E Quigley, David M Pollock, John D Imig |
Journal | Hypertension (Dallas, Tex. : 1979)
(Hypertension)
Vol. 47
Issue 3
Pg. 557-62
(Mar 2006)
ISSN: 1524-4563 [Electronic] United States |
PMID | 16415373
(Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
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Chemical References |
- Angiotensins
- Cyp2c23 protein, rat
- Immunoglobulin G
- Receptors, Tumor Necrosis Factor
- Sodium Chloride, Dietary
- Tumor Necrosis Factor-alpha
- Cytochrome P-450 Enzyme System
- Cytochrome P-450 CYP2J2
- Etanercept
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Topics |
- Albuminuria
(physiopathology)
- Angiotensins
- Animals
- Blood Pressure
(drug effects)
- Cytochrome P-450 CYP2J2
- Cytochrome P-450 Enzyme System
(metabolism)
- Disease Progression
- Etanercept
- Hypertension
(chemically induced, metabolism, pathology, physiopathology)
- Immunoglobulin G
(pharmacology)
- Kidney
(metabolism, pathology)
- Male
- Proteinuria
(physiopathology)
- Rats
- Rats, Sprague-Dawley
- Receptors, Tumor Necrosis Factor
- Sodium Chloride, Dietary
(pharmacology)
- Tumor Necrosis Factor-alpha
(antagonists & inhibitors)
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