Melanin in the rat brain

Abba J. Kastin, Barbara Kuzemchak, Ronald G. Tompkins, Andrew V. Schally, M. Clinton Miller

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Melanin was measured in various parts of the rat brain by a spectrophotofluorometric assay. This method could detect natural, Sepia melanin as well as melanin synthesized from L-DOPA. Contrary to published expectations of other investigators, measurable amounts of melanin were found in the brain of albino as well as pigmented rats. The highest concentrations of melanin occurred in the pons-medulla and midbrain, but all regions within the blood-brain barrier contained greater concentrations than samples from many other tissues in the body. No significant change in the melanin content was found after various endocrine manipulations such as removal of the pituitary, pineal, adrenals, thyroid, testes, or ovaries, exposure to constant illumination or darkness, and daily injection for 5 weeks of α-MSH, Pro-Leu-Gly-NH2 (MIF-I) or melatonin. As expected, retinal tissue from black-hooded rats contained extremely high levels of melanin whereas that from albino rats contained no melanin. It is thought that the presence of melanin in the brain of albino and pigmented rats may have a function which is still unknown.

Original languageEnglish (US)
Pages (from-to)567-572
Number of pages6
JournalBrain Research Bulletin
Volume1
Issue number6
DOIs
StatePublished - Jan 1 1976
Externally publishedYes

Keywords

  • Brain
  • Melanin
  • MSH
  • Pigment
  • Pituitary

ASJC Scopus subject areas

  • Neuroscience(all)

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    Kastin, A. J., Kuzemchak, B., Tompkins, R. G., Schally, A. V., & Miller, M. C. (1976). Melanin in the rat brain. Brain Research Bulletin, 1(6), 567-572. https://doi.org/10.1016/0361-9230(76)90083-6