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Renal cyclooxygenase-2 (COX-2). Physiological, pathophysiological, and clinical implications
Bernhard K Krämer1, Martin C Kammerl, Martin Kömhoff
1Nephrologie, Klinik und Poliklinik für Innere Medizin II, Regensburg, Germany. bernhard.kraemer@klinik.uni-regensburg.de
Kidney & Blood Pressure Research
|December 24, 2003
Summary
Cyclooxygenase-2 (COX-2) is crucial for normal kidney development and function. Inhibiting COX-2 can impair renal blood flow and filtration, potentially leading to acute kidney injury and other adverse effects.
Area of Science:
- Nephrology
- Renal Physiology
- Pharmacology
Background:
- Cyclooxygenase-2 (COX-2) plays a significant role in kidney function, development, and disease.
- Understanding COX-2's renal effects is critical due to the increasing use and side effects of COX-2 inhibitors.
Purpose of the Study:
- To review the specific role of cyclooxygenase-2 (COX-2) in renal physiology and pathophysiology.
- To examine the implications of COX-2 inhibition on kidney function and potential adverse events.
Main Methods:
- Comprehensive review of recent scientific literature.
- Inclusion of unpublished data from the authors' laboratories.
Main Results:
- COX-2 is constitutively present in key renal structures (macula densa, TALH, interstitial cells) and vital for renal development.
- Renal COX-2 activity is regulated by factors like sodium/volume intake and angiotensin II.
- COX-2 derived prostanoids are essential for maintaining renal blood flow, glomerular filtration, and natriuresis, especially during fluid deficit.
- COX-2 inhibitors can decrease glomerular filtration and perfusion, potentially causing acute renal failure, sodium retention, edema, hypertension, and cardiac failure.
- The role of COX-2 in renal inflammation and specific conditions like diabetic nephropathy and transplant rejection is still under investigation.
Conclusions:
- Cyclooxygenase-2 (COX-2) is a key mediator in both normal kidney function and disease states.
- Further research is warranted to elucidate COX-2's role in primary renal diseases.