Renin and kallikrein in connecting tubule of mouse

Andreas Rohrwasser, Tomoaki Ishigami, Barbu Gociman, Pierre Lantelme, Terry Morgan, Tong Cheng, Elaine Hillas, Shuhua Zhang, Kenneth Ward, May Bloch-Faure, Pierre Meneton, J. M. Lalouel

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


Background. The observation of renin expression in connecting tubule, a segment that also expresses tissue kallikrein (KLK-1), raises two questions. Are the genes expressed in the same or in different cells of connecting tubule? Does this topography support the hypothesis that KLK-1 activates prorenin or is it more likely that it affords coordinated gene regulation? Methods. Renin and KLK-1 were examined by immunostaining and in situ hybridization. Renin activation by KLK-1 was investigated in vitro. In vivo, excretion of prorenin and active renin was compared in mice homozygous for targeted inactivation of KLK-1 (TK-/-) and normal littermates (TK+/+). Results. Using in situ immunostaining for renin and in situ hybridization for KLK-1 mRNA, we found that connecting tubule cells expressing renin also expressed KLK-1. We confirmed in vitro activation of prorenin by KLK-1, but found no difference in the ratio of active renin to prorenin in urine of TK-/- and TK+/+ animals. Compared to TK+/+ controls, TK -/- mice exhibited significantly lower 24-hour excretion of prorenin (5.05 ± 1.16 mg Ang I/hour vs. 9.39 ± 1.96 mg Ang I/hour, P < 0.05) and active renin (1.98 ± 0.25 mg Ang I/hour vs. 3.58 ± 0.39 mg Ang I/hour, P < 0.05), with no difference in either urine volumes or plasma renin concentrations. Conclusion. Direct interaction between renin and KLK-1, not ruled out in vitro, is not supported in vivo. By contrast, lower excretion of active renin and prorenin in TK-/- compared to TK +/+ suggest coordinated regulation of the two proteins in their participation to collecting duct function.

Original languageEnglish (US)
Pages (from-to)2155-2162
Number of pages8
JournalKidney International
Issue number6
StatePublished - Dec 2003
Externally publishedYes


  • Connecting tubule
  • Kallikrein
  • Mouse
  • Nephron
  • Prorenin
  • Renin
  • Urinary excretion

ASJC Scopus subject areas

  • Nephrology


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