Angiotensin II induces carbon monoxide production in the perfused kidney: relationship to protein kinase C activation

American Journal of Physiology. Renal Physiology
Ping LiAlberto Nasjletti

Abstract

Heme oxygenase (HO)-derived carbon monoxide (CO) attenuates vascular reactivity to constrictor stimuli. ANG II produces vasoconstriction and induces HO-1 isoform expression. However, direct evidence that ANG II promotes HO product generation is lacking. Therefore, we examined the effects of ANG II on CO release and HO isoform expression in isolated rat kidneys. Kidneys were perfused with oxygenated Krebs buffer. ANG II (1 micromol/l) increased (P < 0.05) perfusion pressure from 97 +/- 9 to 150 +/- 14 mmHg; it also increased (P < 0.05) the concentration of CO in the venous effluent (from 27.1 +/- 11.9 to 45.6 +/- 11.7, 62.5 +/- 16.7, 94.8 +/- 20.7, and 101.9 +/- 13.1 nmol/l after 30, 60, 90, and 120 min, respectively). The pressor effect of ANG II was blunted (P < 0.05) in kidneys perfused with buffer containing losartan (10 micromol/l) or PKC inhibitors staurosporine (0.1 micromol/l) or calphostin C (1 micromol/l). Kidneys perfused with buffer containing ANG II for 120 min also displayed increased (P < 0.05) HO-1 expression. Stannous mesoporphyrin (30 micromol/l) decreased CO release (P < 0.05) in preparations perfused with and without ANG II; the HO inhibitor also increased (P < 0.05) perfusion pressure, more so in kidneys per...Continue Reading

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