Modulation of aflatoxin toxicity and biomarkers by lycopene in F344 rats.

Abstract

Modulation by lycopene of aflatoxin B(1) (AFB(1))-induced toxic effects, metabolism, and metabolic activations was studied in young F344 rats. Animals were pretreated orally with either corn oil (control group) or lycopene [100 mg/kg body weight (b.w.), intervention group] 5 days/week for 2 weeks. Control animals were then treated daily with AFB(1) (250 microg/kg b.w) alone. Intervention animals were administered lycopene (100 mg/kg b.w.) at 1 h following a daily treatment with AFB(1) (250 mug/kg b.w.). Pretreatment and intervention with lycopene significantly reduced the toxic effect caused by AFB(1) and greatly modulated AFB(1) metabolism and metabolic activation. Urinary excretion of AFB(1) phase 1 metabolites, AFM(1), AFQ(1), and AFP(1), was significantly decreased in lycopene-treated animals. Formation of serum AFB(1)-albumin adducts was also significantly reduced. The rate of reduction was from approximately 30% on day 1 (p<0.05) to 67.7% on day 15 (p<0.001). Lycopene intervention also significantly reduced formation of AFB(1)-DNA adducts in liver compared to control animals, with the highest reduction (52.7%) occurring on day 3 (p<0.05). Levels of AFB(1)-N(7)-guanine excreted in urine were also significantly decreased. Urinary excretion of the phase 2 detoxification metabolite, AFB(1)-mecapturic acid, was significantly increased in lycopene-intervened animals. AFB(1)-induced urinary excretion of 8-hydroxydeoxyguanosine was also reduced to 50% on day 7 after lycopene intervention. Collectively, these results suggest that inhibition of phase 1 metabolism and metabolic activation, as well as induction of phase 2 detoxification enzyme activity are the potential mechanisms for the chemopreventive effects of lycopene.

• Authors: Lili Tang, Hongxia Guan, Xiaolin Ding, Jia-Sheng Wang
• Journal: Toxicology and applied pharmacology (Toxicol Appl Pharmacol) Vol. 219 Issue 1 Pg. 10-7 (Feb 15 2007) ISSN: 0041-008X [Print] United States
• PMID: 17229449 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)

Chemical References

• Albumins
• Anticarcinogenic Agents
• Biomarkers
• Carcinogens
• Carotenoids
• 8-Hydroxy-2'-Deoxyguanosine
• DNA
• Aflatoxin B1
• Deoxyguanosine
• Lycopene

Topics

• 8-Hydroxy-2'-Deoxyguanosine
• Aflatoxin B1 (antagonists & inhibitors, metabolism, toxicity)
• Albumins (chemistry)
• Animals
• Anticarcinogenic Agents (pharmacology)
• Biomarkers
• Carcinogens (antagonists & inhibitors, metabolism, toxicity)
• Carotenoids (pharmacology)
• DNA (biosynthesis, genetics)
• Deoxyguanosine (analogs & derivatives, urine)
• Hydrolysis
• Liver (drug effects, metabolism)
• Lycopene
• Male
• Rats
• Rats, Inbred F344