Stimulation of plasma inactive renin by dexamethasone in the cat

N. Glorioso, C. Troffa, G. Tonolo, M. G. Melis, P. Manunta, A. Soro, P. Madeddu, A. Pazzola, F. Pala

Research output: Contribution to journalArticlepeer-review

Abstract

An inactive form of renin in human plasma is the biosynthetic precursor, prorenin . The cat is a good animal model for studies of inactive renin. The gene for human renin contains sequences homologous to the glucocorticoid consensus sequence. The response of cat plasma (active and inactive renin) and of angiotensinogen to administration of dexamethasone (0.5 mg/kg im, daily) was studied in ketamine-sedated cats (20 mg/kg im). Inactive renin increased by twofold after 7 days of dexamethasone (P <0.01). After a 7-day recovery period, it returned to base line. Active renin did not change. Angiotensinogen fell by 35% (P <0.01). The time course of the selective increase of plasma inactive renin showed that inactive renin began to rise after 2 days, peaking after 5 days. Ketamine alone induced inactive renin to rise slightly but significantly (P <0.05), although the magnitude of the increment was much less than that observed in ketamine-sedated cats receiving dexamethasone (P <0.01). Active renin did not change, whereas angiotensinogen was reduced by 25% (P <0.01). Our findings support the hypothesis that glucocorticoids might have a selective role in the synthesis and/or secretion of the precursor of renin, at least in the cat.

Original languageEnglish
JournalAmerican Journal of Physiology - Endocrinology and Metabolism
Volume257
Issue number6
Publication statusPublished - 1989

Keywords

  • angiotensinogen
  • animal model
  • glucocorticoids
  • prorenin

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology
  • Physiology

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