Distribution of immunoreactive dynorphin A1-8 in discrete nuclei of the rat brain: Comparison with dynorphin A

Nadav Zamir, Miklós Palkovits, Michael J. Brownstein

Research output: Contribution to journalArticle

41 Citations (Scopus)


The distribution of immunoreactive (ir)-dynorphin A1-8 (Dyn A1-8) in 78 microdissected rat brain areas as well as in the neurointermediate lobe of pituitary gland was determined using a highly specific radioimmunoassay. The highest concentrations of Dyn A1-8 in brain were found in substantia nigra (673.8 fmol/mg protein) and lateral preoptic area (565.1 fmol/mg protein). High concentrations of ir-Dyn A1-8 (> 240 fmol/mg protein) were found in 5 nuclei: ventral premamillary nucleus, anterior hypothalamic nucleus, dorsomedial nucleus, arcuate nucleus, and medullary reticular nuclei. Moderate concentrations of the peptide (between 120 and 240 fmol/mg protein) were found in 55 brain nuclei such as septal and amygdaloid nuclei, most diencephalic structures, mesencephalic nuclei, pons and medulla oblongata nuclei and others. Low concentrations of ir-Dyn A1-8 (< 120 fmol/mg protein) were found in 16 regions, e.g. frontal cortex, hippocampus, caudate-putamen cortical amygdaloid nucleus, several thalamic nuclei, mamillary body superior and inferior colliculi, cerebellar nuclei and others. The posterior thalamic nucleus has the lowest ir-Dyn A1-8 concentration (62.0 fmol/mg protein). The neurointermediate lobe of the pituitary gland is extremely rich in ir-Dyn A1-8 (4063.0 fmol/mg protein).

Original languageEnglish
Pages (from-to)61-68
Number of pages8
JournalBrain research
Issue number1-2
Publication statusPublished - Jul 30 1984


  • Leu-enkephalin
  • RIA
  • dynorphin A
  • dynorphin A
  • posterior pituitary
  • rat brain nuclei

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

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