Tyrosinase transfection produces melanin synthesis and growth retardation in glioma cells.

Abstract:

:Tyrosinase is the key enzyme in melanin biosynthesis in pigmented cells. We transfected 9L rat glioma cells with human tyrosinase cDNA that had been cloned in a high expression vector. Stable transfectants were selected by their resistance to the antibiotic G418. More than a dozen G418-resistant clones were isolated and were screened for tyrosinase expression using dopa-oxidase activity. The clone with the highest tyrosinase activity was selected and expanded for further studies. Northern blot analyses of total RNA from cells showed that the transfected cells had relatively more tyrosinase transcript than SK-MEL-23 human melanotic melanoma cells. The melanin content of the transfected cells was dependent on the concentration of L-tyrosine in the culture medium. In addition, the growth of transfected cells was inhibited when grown in a medium containing high concentrations of L-tyrosine. These results suggest that tyrosinase activity is cytotoxic in a substrate-dependent manner. This may have far reaching therapeutic use for glioma tumours.

journal_name

Melanoma Res

journal_title

Melanoma research

authors

Singh MV,Jimbow K

doi

10.1097/00008390-199812000-00003

subject

Has Abstract

pub_date

1998-12-01 00:00:00

pages

493-8

issue

6

eissn

0960-8931

issn

1473-5636

journal_volume

8

pub_type

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