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Promotion of colon carcinogenesis through increasing lipid peroxidation induced in rats by a high cholesterol diet

Authors
Journal
Cancer Letters
0304-3835
Publisher
Elsevier
Publication Date
Volume
100
Identifiers
DOI: 10.1016/0304-3835(95)04073-0
Keywords
  • Colon Cancer
  • Cholesterol
  • Lipid Peroxidation
  • Dimethylhydrazine
  • Promotion
Disciplines
  • Biology
  • Medicine

Abstract

Abstract To examine the influence of hypercholesteremia on 1,2-dimethylhydrazine (DMH)-induced rat colon cancer, Sprague-Dawley rats received dietary cholesterol (CH, 0–2%) and cholic acid (CA, 0.25%) with or without DMH (20 mg/kg, s.c. injection) for 18 weeks. The rats receiving dietary cholesterol and cholic acid all significantly increased total serum cholesterol and lipids but only a high cholesterol diet (2% CH plus 0.25% CA) decreased the activity of glutathione peroxidase (GSH-Px) and increased the formation of peroxides in the colon ( P < 0.01). The rats that received the combination of DMH and high cholesterol diet enhanced these effects. At the end of the experiment, the diet group administered DMH and high cholesterol (2% CH plus 0.25% CA) developed colon adenoma at 50% of incidence in pathological examination, but no colon adenoma formed in the rats treated with high cholesterol alone. It is supposed that a non-carcinogenic agent like cholesterol may potentiate the carcinogenicity of DMH in rats via an increase of lipid peroxidation and decrease in the activity of peroxidase in the target organ.

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