Related Experiment Video
Updated: Jul 29, 2026
08:50
5/6th Nephrectomy in Combination with High Salt Diet and Nitric Oxide Synthase Inhibition to Induce Chronic Kidney Disease in the Lewis Rat
Published on: July 3, 2013
Renin expression in COX-2-knockout mice on normal or low-salt diets
1National Institute of Diabetes, and Digestive and Kidney Diseases, Bethesda, Maryland 20892, USA.
American Journal of Physiology. Renal Physiology
|October 29, 2000
Summary
Cyclooxygenase-2 (COX-2) in kidney tubule cells is crucial for regulating renin production. COX-2 deficiency impairs renin synthesis and its response to low salt diets.
Area of Science:
- Nephrology
- Molecular Biology
- Physiology
Background:
- Renin, an enzyme crucial for blood pressure regulation, is synthesized in juxtaglomerular granular cells.
- Cyclooxygenase-2 (COX-2) is expressed in renal epithelial cells near the glomerulus.
- The precise role of COX-2 in renin regulation remains to be fully elucidated.
Purpose of the Study:
- To investigate the role of cyclooxygenase-2 (COX-2) in regulating renin gene expression.
- To determine if COX-2 in macula densa and TAL cells influences renin synthesis in juxtaglomerular cells.
Main Methods:
- Experiments were conducted in wild-type and COX-2-knockout mice.
- Mice were subjected to control and low-sodium chloride (NaCl) diets.
- Renin activity, afferent arteriolar granularity, and renin mRNA levels were measured.
Main Results:
- COX-2 knockout mice exhibited reduced renin activity, afferent arteriolar granularity, and renin mRNA levels compared to wild-type mice.
- Low-salt diet increased renin markers in wild-type mice, but this response was significantly blunted in COX-2 knockout mice.
- COX-2 mRNA levels were elevated in angiotensin type 1A receptor-knockout mice.
Conclusions:
- COX-2 in the tubulovascular contact region is essential for renin synthesis under basal conditions.
- COX-2 plays a significant role in mediating the stimulation of renin expression in response to low-NaCl intake.
