Chlorophyllin intervention reduces aflatoxin–DNA adducts in individuals at high risk for liver cancer
| Autor: | Jin Bing Wang, Lisa P. Jacobson, Shuang Yuan Kuang, Thomas W. Kensler, Patricia A. Egner, Kathy J. Helzlsouer, Geng Sun Qian, Qi Nan Zhang, John D. Groopman, Stephen J. Gange, George S. Bailey, Bao Chu Zhang, Yuan Rong Zhu, Yan Wu |
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| Rok vydání: | 2001 |
| Předmět: |
Adult
Male China Aflatoxin Aflatoxin B1 Carcinoma Hepatocellular Guanine Food Contamination Urine Pharmacology Toxicology DNA Adducts chemistry.chemical_compound Aflatoxins Risk Factors medicine Animals Humans Carcinogen Aged Multidisciplinary Chlorophyllides Chemistry Chlorophyllin Liver Neoplasms Middle Aged Biological Sciences medicine.disease Effective dose (pharmacology) Bioavailability Hepatocellular carcinoma Female Liver cancer Biomarkers |
| Zdroj: | Proceedings of the National Academy of Sciences. 98:14601-14606 |
| ISSN: | 1091-6490 0027-8424 |
| DOI: | 10.1073/pnas.251536898 |
| Popis: | Residents of Qidong, People's Republic of China, are at high risk for development of hepatocellular carcinoma, in part from consumption of foods contaminated with aflatoxins. Chlorophyllin, a mixture of semisynthetic, water-soluble derivatives of chlorophyll that is used as a food colorant and over-the-counter medicine, has been shown to be an effective inhibitor of aflatoxin hepatocarcinogenesis in animal models by blocking carcinogen bioavailability. In a randomized, double-blind, placebo-controlled chemoprevention trial, we tested whether chlorophyllin could alter the disposition of aflatoxin. One hundred and eighty healthy adults from Qidong were randomly assigned to ingest 100 mg of chlorophyllin or a placebo three times a day for 4 months. The primary endpoint was modulation of levels of aflatoxin-N 7 -guanine adducts in urine samples collected 3 months into the intervention measured by using sequential immunoaffinity chromatography and liquid chromatography–electrospray mass spectrometry. This aflatoxin–DNA adduct excretion product serves as a biomarker of the biologically effective dose of aflatoxin, and elevated levels are associated with increased risk of liver cancer. Adherence to the study protocol was outstanding, and no adverse events were reported. Aflatoxin-N 7 -guanine could be detected in 105 of 169 available samples. Chlorophyllin consumption at each meal led to an overall 55% reduction ( P = 0.036) in median urinary levels of this aflatoxin biomarker compared with those taking placebo. Thus, prophylactic interventions with chlorophyllin or supplementation of diets with foods rich in chlorophylls may represent practical means to prevent the development of hepatocellular carcinoma or other environmentally induced cancers. |
| Databáze: | OpenAIRE |
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