Genetic Control of Melanization: Isolation and Analysis of Amelanotic Variants from Cultured Melanotic Melanoma Cells

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1974 Apr 1

PMID 4364526

Citations 7

Authors

J Pawelek

M Sansone

J Morowitz

G Moellmann

E Godawska

Affiliations

Soon will be listed here.

Abstract

MELANOMA CELLS EXPRESS A PHENOTYPE THAT IS EASY TO RECOGNIZE: the synthesis of melanin. We used this marker to isolate clones of amelanotic variants from large populations of wild-type melanotic clones. Cloudman mouse melanoma (S91, clone M-3, CCL 53.1) was chosen as the parental line because the cells are highly pigmented, grow well as clones in soft agar, and fuse readily with Sendai virus. Subclones (10(7)) of this line were screened without prior mutagenesis, and nine amelanotic variants were isolated. The mutagen ethylmethanesulfonate increased the frequency of variants by three to four orders of magnitude. Wild-type cells had both basal and melanocyte stimulating hormone-inducible tyrosinase activities. The four amelanotic variants that we have examined to date all behaved similarly: they lost basal tyrosinase (EC 1.14.18.1; monophenol monooxygenase) activity but retained melanocyte stimulating hormone-inducible activity; they contained Stage-II melanosomes but no melanized melanosomes; they exhibited growth characteristics similar to those of wild-type cells in culture but produced fewer tumors in mice.

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