Tyrosinase biosynthesis in adult mammalian retinal pigment epithelial cells.
Exp Eye Res
; 83(2): 315-21, 2006 Aug.
Article
em En
| MEDLINE
| ID: mdl-16579986
ABSTRACT
Tyrosinase (EC 1.14.18.1) is the rate limiting enzyme of melanogenesis and it is unclear whether it is synthesized in postnatal retinal pigment epithelium (RPE). Cultured RPE cells from cattle were fed with isolated rod outer segments (ROS). After phagocytosis, RPE cells were tested for tyrosinase presence and activity with three independent methods:
(1) ultrastructural DOPA (l-3,4-dihydroxyphenylalanine) histochemistry (2) immunocytochemistry with anti-tyrosinase antibodies (3) measuring tyrosine hydroxylase activity using [(3)H]tyrosine. With all three methods tyrosinase was found in RPE cells after ROS-feeding but was absent without feeding. In contrast to the classical hypothesis, we demonstrated with three independent methods that the expression of tyrosinase and its enzymatic activity are induced in cultured adult RPE by phagocytosis of rod outer segments (ROS) in vitro.
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Coleções:
01-internacional
Temas:
Geral
Base de dados:
MEDLINE
Assunto principal:
Epitélio Pigmentado Ocular
/
Monofenol Mono-Oxigenase
Limite:
Animals
Idioma:
En
Revista:
Exp Eye Res
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Alemanha