Myocardial and plasma renin-angiotensinogen dynamics during pressure- induced cardiac hypertrophy

Lois J. Heller, John A. Opsahl, Shane E. Wernsing, Retu Saxena, Stephen A. Katz

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

Plasma and left ventricular (LV) renin and angiotensinogen concentrations were assessed in a rat model of pressure-overload cardiac hypertrophy to determine if myocardial levels remained proportional to plasma levels over time. Three days after subdiaphragmatic aortic constriction (AC), LV hypertrophy was evident and renin concentrations in both plasma and LV, although not significantly elevated, were positively correlated with relative cardiac mass. After 42 days AC, LV hypertrophy remained, plasma and LV renin and angiotensinogen levels were not different from shams, and there was no correlation between renin and relative cardiac mass. Furthermore, LV renin and angiotensinogen concentrations remained at ~25 and 4%, respectively, of those in plasma throughout the experiment. Myocytes from 3-day AC and sham- treated rats contained little renin as did LV from 48-h anephric rats. Incubations using calculated concentrations of myocardial interstitial renin and angiotensinogen revealed significant angiotensin I generation. These data suggest that LV renin in this model varies directly with plasma renin, is confined to the interstitial space, and can generate significant intramyocardial angiotensin I.

Original languageEnglish (US)
Pages (from-to)R849-R856
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume274
Issue number3 43-3
StatePublished - Mar 1 1998

Keywords

  • Aortic constriction
  • Cardiac myocytes
  • Hypertension
  • Myocardium
  • Renin-angiotensin system

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