Localization of renal kallikrein-kinin system components in the kidney.

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Abstract
In a study using a stop-flow technique in dog kidney, the existence of kalikrein and kinin was recognized in distal tubules. The presence of kininase I was seen in both distal and proximal tubules, and also partly in the distal tubules. The presence of kininase II in the distal tubules was again confirmed by pretreatment with SQ14225. No evidence of kinin formation, however, was obtained in the proximal nephrons in stop-flow method. From these results, it was suggested that kininase I and II localized in proximal tubules may destroy the kinin filtered from glomeruli at the proximal level, while kallikrein and kininogen and also kininase I and II in the distal tubules may regulate the activity of the renal kallikrein-kinin system in the distal nephrons.

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