Postnatal development of the renin-angiotensin system in rats

K. B. Wallace, J. B. Hook, M. D. Bailie

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Abstract

The purpose of this investigation was to correlate the development of the various enzyme activities associated with the renin-angiotensin system with age-related differences in the steady-state concentrations of angiotensin I (AI) and II (AII). Angiotensin was quantified by radioimmunoassay. Plasma renin activity and concentration increased between birth and 3 wk of age, and declined thereafter to adult values. Renal renin content, on the other hand, increased throughout the first 6 wk of postnatal life. The concentration of AII in plasma also increased following birth; however, maximum concentrations were not attained until 5 wk of age. In contrast, plasma AI did not increase between 3 and 6 wk of age. These data suggest that the steady-state concentration of AII in neonatal rat plasma may be partially limited by the low plasma renin substrate concentration. The increase in AII between 3 and 6 wk of age may reflect the increasing converting enzyme activity.

Original languageEnglish (US)
Pages (from-to)432-437
Number of pages6
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume238
Issue number5
StatePublished - May 1980

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