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Journal of Cancer Research and Clinical Oncology logoLink to Journal of Cancer Research and Clinical Oncology
. 1995 Jul;121(7):402–406. doi: 10.1007/BF01212946

Antioxidant enzymes are elevated in dimethylbenz[a]anthracene-induced neoplastic murine keratinocytes containing an activeras Ha oncogene

Kirsi Lehtola 1, Leena Laurikainen 2, Lasse Leino 1, Markku Ahotupa 3, Kari Punnonen 1,
PMCID: PMC12200380  PMID: 7635869

Abstract

Antioxidant enzyme activities and peroxidation potential were measured in primary mouse keratinocytes and neoplastic keratinocytes containing an activeras Ha oncogene. In neoplastic cell lines, SP-1 and 308, the activities of Cu, Zh-superoxide dismutase, catalase, and glutathione transferase were significantly elevated. The peroxidation potential was lower in cell homogenates prepared from neoplastic keratinocytes than in those prepared from normal keratinocytes. Consistently, the neoplastic 308 cell line was found to be more resistant than the normal keratinocytes to cytotoxicity induced by UV-B irradiation. The present study suggests that the enhanced antioxidant defense system protects the initiated cells from UV-B-induced oxidative stress, and that the enhanced enzymic anti-oxidant defense system is potentially a mechanism favoring the selective growth of neoplastic keratinocytes.

Key words: Antioxidants, rasHa oncogene, Keratinocyte, UV irradiation

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