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Uptake of noradrenaline in high altitude native's heart
Experientia
|June 15, 1977
Insights
Native highlanders exhibit greater affinity for 3H-noradrenaline in heart atria compared to lowlanders. This indicates a lower Michaelis Menten constant, suggesting enhanced cardiac noradrenaline uptake in those adapted to high altitudes.
Area of Science:
- Cardiology
- Physiology
- Altitude Medicine
Background:
- The human heart's response to environmental factors like high altitude is crucial for understanding cardiovascular adaptation.
- Noradrenaline plays a key role in cardiac function and regulation.
Purpose of the Study:
- To investigate the differences in 3H-noradrenaline uptake by human atrial tissue between native highlanders and lowlanders.
- To determine if altitude adaptation affects cardiac adrenergic mechanisms.
Main Methods:
- Isolated atrial sections from highlanders and lowlanders were used.
- The uptake of 3H-noradrenaline was measured and analyzed.
Main Results:
- Human atria from native highlanders showed a significantly higher affinity for 3H-noradrenaline compared to lowlanders.
- The Michaelis Menten constant (Km) for noradrenaline uptake was found to be lower in the hearts of high-altitude natives.
Conclusions:
- Native highlanders possess an enhanced capacity for cardiac noradrenaline uptake.
- This adaptation may be a compensatory mechanism for cardiovascular function at high altitudes.
Abstract:
Uptake of 3H-noradrenaline by the heart was studied with sections of isolated atria obtained from high or lowlanders. In native highlanders, affinity for 3H-noradrenaline by human atria is more significant than in lowlanders. Furthermore, the Michaelis Menten constant is lower in high altitude native's heart.