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Grape Seed Proanthocyanidin Suppression of Breast Cell Carcinogenesis Induced by Chronic Exposure to Combined 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone and Benzo[a]pyrene

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Journal Mol Carcinog
Date 2010 Feb 11
PMID 20146248
Citations 17
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Abstract

Breast cancer is the most common type of cancer among women in northern America and northern Europe; dietary prevention is a cost-efficient strategy to reduce the risk of this disease. To identify dietary components for the prevention of human breast cancer associated with long-term exposure to environmental carcinogens, we studied the activity of grape seed proanthocyanidin extract (GSPE) in suppression of cellular carcinogenesis induced by repeated exposures to low doses of environmental carcinogens. We used combined carcinogens 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) and benzo[a]pyrene (B[a]P), at picomolar concentrations, to repeatedly treat noncancerous, human breast epithelial MCF10A cells to induce cellular acquisition of cancer-related properties of reduced dependence on growth factors, anchorage-independent growth, and acinar-conformational disruption. Using these properties as biological target endpoints, we verified the ability of GSPE to suppress combined NNK- and B[a]P-induced precancerous cellular carcinogenesis and identified the minimal, noncytotoxic concentration of GSPE required for suppressing precancerous cellular carcinogenesis. We also identified that hydroxysteroid-11-beta-dehydrogenase 2 (HSD11B2) may play a role in NNK- and B[a]P-induced precancerous cellular carcinogenesis, and its expression may act as a molecular target endpoint in GSPE's suppression of precancerous cellular carcinogenesis. And, the ability of GSPE to reduce gene expression of cytochrome-P450 enzymes CYP1A1 and CYP1B1, which can bioactivate NNK and B[a]P, possibly contributes to the preventive mechanism for GSPE in suppression of precancerous cellular carcinogenesis. Our model system with biological and molecular target endpoints verified the value of GSPE for the prevention of human breast cell carcinogenesis induced by repeated exposures to low doses of multiple environmental carcinogens.

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