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Dietary components modify the ability of garlic to suppress 7,12-dimethylbenz(a)anthracene-induced mammary DNA

H Amagase1, E M Schaffer, J A Milner

  • 1Department of Nutrition, The Pennsylvania State University, University Park 16802, USA.

The Journal of Nutrition
|April 1, 1996
PubMed

Insights

Dietary garlic reduces mammary cell DNA adducts caused by 7,12-dimethylbenz(a)anthracene (DMBA) in rats. This protective effect is influenced by dietary casein, L-methionine, and corn oil levels.

Area of Science:

  • Nutritional biochemistry
  • Cancer prevention research
  • Toxicology

Background:

  • 7,12-dimethylbenz(a)anthracene (DMBA) is a potent carcinogen that induces DNA adducts in mammary cells.
  • Dietary factors can modulate the formation of DMBA-induced DNA adducts.
  • Garlic is known for its potential chemopreventive properties.

Purpose of the Study:

  • To investigate the influence of various dietary components on garlic's efficacy in reducing DMBA-induced mammary cell DNA adducts in rats.
  • To determine how dietary casein, L-methionine, and corn oil levels interact with garlic supplementation to affect DNA adduct formation.

Main Methods:

  • Rats were fed diets with or without garlic powder for 2 weeks before DMBA treatment.
  • Diets varied in casein (12 or 36 g/100 g), L-methionine (0.3 or 0.9 g/100 g), and corn oil (5 or 20 g/100 g) content.
  • Mammary cell DNA adduct levels were quantified following DMBA administration.

Main Results:

  • Garlic supplementation significantly reduced DMBA-induced DNA adducts.
  • Higher casein and L-methionine levels decreased adducts, and garlic's effect was more pronounced with lower methionine.
  • Increased corn oil intake elevated adducts, an effect mitigated by garlic.
  • Combined garlic, selenite, and retinyl acetate showed greater inhibition than individual supplements.

Conclusions:

  • Dietary garlic demonstrates chemopreventive potential against DMBA-induced mammary DNA adducts in rats.
  • The protective effect of garlic is significantly modulated by the levels of dietary casein, L-methionine, and corn oil.
  • Optimizing dietary composition alongside garlic intake may enhance its cancer-preventive benefits.

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