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Pflügers Archiv

, Volume 389, Issue 2, pp 91–95 | Cite as

Localization of kallikrein-like activity along a single nephron in rabbits

  • Kimio Tomita
  • Hitoshi Endou
  • Fuminori Sakai
Transport Processes, Metabolism and Endocrinology; Kidney, Gastrointestinal Tract, and Exocrine Glands

Abstract

In order to investigate the presence of renal kallikrein, the localization of kallikrein-like proteolytic activity along a single nephron was determined in rabbits. Single nephrons were dissected into 8 segments under a microscope. Activity was fluorometrically measured with two different substrates (benzyl-l-arginine ethyl ester: BAEE and prolyl-phenylalanylarginine-methylcoumarin amide: MCA). Proteolytic activity could be detected in the early (S1), the middle (S2), and the terminal (S3) portions of the proximal tubule and in the granular portion of the distal tubule (DCTg). With MCA, the specific activity in S1, S2, S3 and DCTg was 0.77±0.08, 0.28±0.10, 0.13±0.05, and 0.27±0.05 pmoles/μg/min, respectively. The activity in DCTg was inhibited by aprotinin but that in the proximal tubules was not inhibited. No activity was found in the glomerulus, the thick ascending limb of Henle's loop, the bright portion of the distal tubule, and the light portion of the cortical collecting tubule. The inhibition of the activity by aprotinin in DCTg suggests that intrarenal kallikrein could be localized only in DCTg.

Key words

Renal kallikrein Kallikrein-like activity Aprotinin Microdissection Single nephron Distal convoluted tubule Granular portion of distal convoluted tubule 

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Copyright information

© Springer-Verlag 1981

Authors and Affiliations

  • Kimio Tomita
    • 1
  • Hitoshi Endou
    • 1
  • Fuminori Sakai
    • 1
  1. 1.Department of Pharmacology, Faculty of MedicineUniversity of TokyoTokyoJapan

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