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Related Experiment Videos

Plasma free dopamine: physiological variability and pathophysiological significance

Y Miura1, T Watanabe, T Noshiro

  • 1Department of Informatics on Pathophysiology, Tohoku University Graduate School of Information Science, Japan.

Hypertension Research : Official Journal of the Japanese Society of Hypertension
|June 1, 1995
PubMed
Summary

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Unconjugated dopamine (PDA) in plasma, though scarce, differs in hypertensive patients. PDA levels are linked to peripheral dopaminergic activity and may play a role in cardiovascular and endocrine regulation.

Area of Science:

  • Biochemistry
  • Endocrinology
  • Cardiovascular Physiology

Background:

  • Dopamine (DA) is primarily found as inactive DA sulfate in plasma.
  • The physiological role of scarce unconjugated dopamine (PDA) is unclear.
  • PDA exhibits distinct patterns in various clinical hypertension types.

Purpose of the Study:

  • To investigate the physiological significance and behavior of unconjugated dopamine (PDA) in plasma.
  • To explore the role of PDA in the peripheral sympathoadrenal system and its relation to hypertension.

Main Methods:

  • Measurement of PDA using a highly sensitive radioenzymatic method.
  • Analysis of PDA levels in different hypertensive conditions (essential hypertension, primary aldosteronism, pheochromocytoma).
  • Assessment of PDA response to physiological stimuli (posture, salt intake) and pharmacological agents (metoclopramide, dexamethasone, alpha-methyl-p-tyrosine).

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Main Results:

  • PDA levels were lower in essential hypertension and higher in primary aldosteronism and pheochromocytoma.
  • Upright posture, high salt diets, and metoclopramide increased PDA in normal and hypertensive subjects.
  • Dexamethasone increased PDA, an effect blocked by alpha-methyl-p-tyrosine; responses to salt and metoclopramide were blunted in salt-sensitive hypertension.

Conclusions:

  • PDA is not just a norepinephrine precursor but an active peripheral neurotransmitter.
  • PDA serves as a sensitive marker for peripheral dopaminergic activity.
  • PDA may modulate cardiovascular/endocrine functions and contribute to hypertension pathogenesis.