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We used the gracilis muscle vascular bed to bioassay blood from the two renal veins, vena cava, and aorta continuously for the presence of vasoactive agents before and for 45 minutes after partial occlusion of the left renal artery in dogs. Compared to comparable blood samples from control dogs, left renal venous, vena caval, and aortic blood, but not right renal venous blood, from dogs with renal artery constriction developed vasoconstrictor activity. This was associated with increased renin concentration in plasma from the left renal vein and the vena cava and an increase in systemic arterial pressure. In dogs pretreated with indomethacin, blood from the right renal vein also showed vasoconstrictor activity. Pretreatment with antirenin serum abolished all of the differences between control and experimental dogs. These findings suggest that during acute unilateral renal artery constriction the constricted kidney releases renin and the contralateral kidney releases prostaglandins in sufficient quantity to produce systemic vascular effects.

Bioassay in vivo for circulating vasoactive agents after renal artery constriction in dogs.