Cysteinyldopamine is not incorporated into neuromelanin.

Abstract:

:The pigment of human substantia nigra, neuromelanin, has been thought to be derived from dopamine. To examine the genesis of neuromelanin, we advanced a new hypothesis that neuromelanin is formed by oxidation of dopamine and cysteinyldopamine. On the basis of this hypothesis, synthetic neuromelanins were obtained by tyrosinase oxidation of dopamine in the presence of various ratios of cysteine and were hydrolyzed with hydriodic acid to obtain 4-amino-3-hydroxyphenylethylamine (AHPEA). The AHPEA content in these synthetic melanins was shown to be proportional to the sulfur content. Eleven samples of human substantia nigra were treated as well and contents of AHPEA were found to be only trace amounts. These results suggest that cysteinyldopamine may not be incorporated into neuromelanin.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Wakamatsu K,Ito S,Nagatsu T

doi

10.1016/0304-3940(91)90336-r

subject

Has Abstract

pub_date

1991-09-30 00:00:00

pages

57-60

issue

1

eissn

0304-3940

issn

1872-7972

pii

0304-3940(91)90336-R

journal_volume

131

pub_type

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