Aug 1, 1984

Prenatal ontogenesis of p-, m-octopamine and phenylethanolamine in relation to catecholamines and their metabolizing enzymes in the developing rat brain and heart

Neuroscience
J C DavidJ Delacour

Abstract

Non-catecholamines such as phenylethanolamine and p-octopamine are present in many invertebrate nervous systems, sometimes in large amounts. These amines are normally present in the rat brain at much lower levels, p- and m-octopamine are present at trace levels in the mammalian brain. The prenatal development of these amines was studied in comparison with those of noradrenaline and dopamine. The activities of tyrosine hydroxylase, dopa decarboxylase, dopamine beta-hydroxylase and monoamine oxidase were determined in parallel. Phenylethanolamine and p-octopamine are more abundant in the brain between 13 and 17 fetal days than dopamine and noradrenaline but decrease after 17 days whereas the levels of m-octopamine and the two catecholamines increase afterwards. Dopa decarboxylase, dopamine beta-hydroxylase and tyrosine hydroxylase are detected early in fetal life (13, 15 and 14.5 days respectively) but monoamine oxidase activity was not found before 18 days.

  • References24
  • Citations10

Citations

Mentioned in this Paper

2-Hydroxyphenethylamine
Octopamine
August Rats
Brain
Myocardium
Dopamine-beta-monooxygenase
Norfenefrine, 2H-labeled cpd
Heart
DOPA decarboxylase
Tyrosine 3-Monooxygenase

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