The present study examined the effects of angiotensin converting enzyme (ACE) inhibitors and an angiotensin II type 1 (AT1) receptor antagonist on the metabolism of arachidonic acid (AA) in the kidney. Male Sprague-Dawley rats were treated with vehicle, captopril, enalapril, or candesartan for one week. The production of 20-hydroxy-eicosatetraenoic acid (20-HETE) and epoxyeicosatrienoic acids (EETs) by renal microsomes increased in rats treated with captopril and enalapril. In contrast, blockade of the AT1 receptors with candesartan had no effect on the production of these metabolites. Captopril and enalapril increased the expression of P450 4A protein and P450 reductase protein in renal microsomes. The effects of captopril on the renal matabolism of AA were blocked by either HOE-140, a bradykinin type 2 receptor antagonist or LNAME, a nitric oxide (NO) synthase inhibitor. These results suggest that ACE inhibitors increase the expression of P450 4A and P450 reductase proteins in the kidney and enhance the formation of 20-HETE and EETs secondary to increases in intrarenal levels of kinin and NO.
|Number of pages||4|
|Publication status||Published - 2001|
- 20-Hydroxyeicosatetraenoic acid
- Angiotensin converting enzyme inhibitor
- Arachidonic acid
- P450 4A
ASJC Scopus subject areas