Related Experiment Videos
Plasma renin activity, aldosterone and dopamine beta-hydroxylase activity as a function of age in normal children
Insights
Plasma renin activity (PRA) and aldosterone (PA) decrease with age in children, while dopamine beta hydroxylase activity (DBH) increases. These findings highlight the opposing developmental trajectories of the Renin-Angiotensin-Aldosterone System and the sympathoadrenal system.
Area of Science:
- Pediatric endocrinology
- Developmental physiology
- Cardiovascular regulation
Background:
- The Renin-Angiotensin-Aldosterone System (RAAS) and the sympathoadrenal system are critical for blood pressure regulation.
- Understanding their developmental patterns in children is essential for identifying potential health risks.
Purpose of the Study:
- To investigate the age-related changes in plasma renin activity (PRA), plasma aldosterone (PA), and plasma dopamine beta hydroxylase (DBH) activity in children.
- To explore the relationship between these hormonal systems during development.
Main Methods:
- Radioimmunoassay was used to measure PRA and PA in 149 children aged 6 days to 15 years.
- Dopamine beta hydroxylase (DBH) activity was measured using the Nagatsu method.
- Statistical analysis was performed to determine age-related trends and correlations.
Main Results:
- PRA and PA significantly decreased with age, from newborn levels to those in older children.
- DBH activity significantly increased with age, starting from below detection limits in neonates.
- Significant positive correlation between PRA and PA, and a negative correlation between PRA and DBH were observed.
Conclusions:
- The RAAS and the sympathoadrenal system exhibit inverse developmental patterns in children.
- These findings provide insights into the maturation of cardiovascular regulatory systems during childhood.
Abstract:
In 149 children between 6 days and 15 years of age, plasma renin activity (PRA) and aldosterone (PA) were measured by radioimmunoassay and plasma dopamine beta hydroxylase activity (DBH) by the method of Nagatsu. PRA and PA decreased with age from 496 +/- 119 ng/1/min for PRA and 643 +/- 158 pg/ml for PA in 6 to 30 day-old newborns to 37.8 +/- 4.7 ng/1/min for PRA and 43. 1+/- 8.3 ph/ml for PA in 9 to 15 year-old children. DBH increased with age from less than detection limit values (< 2 IU) in 6 day to 3 month-old newborns to 17.2 +/- 5.1 IU in 9 to 15 year-old children. In addition a significant relationship was found between PRA and PA (log PA = 0.99 log PRA -0.058, r = 0.732, n = 104, p < 0.001) and PRA and DBH (log DBH = -0.41 log PRA +1.62, r = 0.404, n = 80, p < 0.001). These results demonstrate the opposite evolution of the Renin-Angiotensin-Aldosterone System and of the sympathoadrenal system during development.