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Does tyrosinase exist in neuromelanin-pigmented neurons in the human substantia nigra?

Authors
Type
Published Article
Journal
Neuroscience Letters
0304-3940
Publisher
Elsevier
Publication Date
Volume
253
Issue
3
Pages
198–200
Identifiers
PMID: 9792245
Source
Medline
License
Unknown

Abstract

It is controversial whether tyrosinase is involved in the neuromelanin-biosynthetic pathway. We examined tyrosinase-immunoreactivity in human substantia nigra neurons which contain neuromelanin pigments, using antibodies against human tyrosinase and human tyrosine hydroxylase. In human melanoma, the antibody to tyrosinase showed intense immunoreactivity while there was no immunoreactivity with antibody to tyrosine hydroxylase. In the human midbrain pigmented neurons, however, we could detect no tyrosinase-immunoreactivity while the neurons were strongly immunoreactive to tyrosine hydroxylase. The present results suggest that tyrosinase is not involved in the main pathway of neuromelanin biosynthesis.

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