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. 1993 Apr 1;90(7):3113–3117. doi: 10.1073/pnas.90.7.3113

Increased manganese superoxide dismutase expression suppresses the malignant phenotype of human melanoma cells.

S L Church 1, J W Grant 1, L A Ridnour 1, L W Oberley 1, P E Swanson 1, P S Meltzer 1, J M Trent 1
PMCID: PMC46247  PMID: 8464931

Abstract

Introduction of a normal human chromosome 6 into human melanoma cell lines results in suppression of tumorigenicity. This suggests that a gene(s) on chromosome 6 controls the malignant phenotype of human melanoma. Because antioxidants can suppress the tumor-promotion phase of carcinogenesis, and because the antioxidant enzyme manganese superoxide dismutase (MnSOD) has been localized to a region of chromosome 6 frequently lost in melanomas, we have examined the effect of transfecting sense and antisense human MnSOD cDNAs into melanoma cell lines. Cell lines expressing abundant (+)-sense MnSOD-5 cDNAs significantly altered their phenotype in culture and lost their ability to form colonies in soft agar and tumors in nude mice. In contrast, the introduction of antisense MnSOD or +psv2neo had no effect on melanoma tumorigenicity. These findings indicate that stable transfection of MnSOD cDNA into melanoma cell lines exerts a biological effect that mimics that observed after introduction of an entire human chromosome 6.

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