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Clinical aspects on presynaptic noradrenaline metabolism
J Ludwig1, T Halbrügge, K H Graefe
1Medical School, University of Würzburg, Federal Republic of Germany.
Journal of Neural Transmission. Supplementum
|January 1, 1991
Summary
Essential hypertensives show elevated plasma dihydroxyphenylglycol (DOPEG) levels compared to healthy individuals. This difference is linked to both desipramine-sensitive and -resistant DOPEG pools, impacting noradrenaline (NA) metabolism.
Area of Science:
- Neuropharmacology
- Cardiovascular Physiology
- Biochemistry
Background:
- Plasma noradrenaline (NA) and its metabolite dihydroxyphenylglycol (DOPEG) are key indicators of sympathetic nervous system activity.
- Understanding the regulation of NA and DOPEG metabolism is crucial for investigating conditions like hypertension.
Purpose of the Study:
- To investigate the relationship between plasma NA and DOPEG levels in healthy subjects and patients with essential hypertension.
- To explore the role of neuronal uptake blockade in modulating plasma DOPEG levels.
Main Methods:
- Measurement of plasma NA and DOPEG concentrations in healthy subjects and essential hypertensives.
- Administration of desipramine to block neuronal uptake and assess its effect on plasma DOPEG.
- Comparison of DOPEG levels at varying plasma NA concentrations.
Main Results:
- In healthy subjects, upright posture and isoprenaline infusion induced similar increases in plasma NA and DOPEG.
- Desipramine blockade of neuronal uptake eliminated plasma DOPEG responses and reduced basal DOPEG levels.
- Essential hypertensives exhibited higher plasma DOPEG levels relative to plasma NA compared to normotensive controls.
Conclusions:
- Plasma DOPEG levels are influenced by neuronal uptake, as demonstrated by desipramine's effects.
- Elevated plasma DOPEG in essential hypertension is partly attributed to both desipramine-sensitive and -resistant DOPEG pools.
- These findings suggest altered noradrenaline metabolism in essential hypertension.