Malabaricone C-containing mace extract inhibits safrole bioactivation and DNA adduct formation both in vitro and in vivo - PubMed (original) (raw)
Malabaricone C-containing mace extract inhibits safrole bioactivation and DNA adduct formation both in vitro and in vivo
Erryana Martati et al. Food Chem Toxicol. 2014 Apr.
Abstract
Safrole, present in mace and its essential oils, causes liver tumors in rodents at high dose levels due to formation of a DNA reactive 1'-sulfooxysafrole. The present study identifies malabaricone C as a mace constituent able to inhibit safrole DNA adduct formation at the level of sulfotransferase mediated bioactivation. This inhibition was incorporated into physiologically based biokinetic rat and human models. Dosing safrole at 50mg/kg body weight and malabaricone C-containing mace extract at a ratio reflecting the relative presence in mace, and assuming 100% or 1% uptake of malabaricone C-containing mace extract, the model predicted inhibition of 1'-sulfooxysafrole formation for rats and humans by 90% and 100% or 61% and 91%, respectively. To validate the model, mace extract and safrole were co-administered orally to Sprague-Dawley rats. LC-ECI-MS/MS based quantification of DNA adduct levels revealed a significant (p<0.01) 55% reduction of safrole DNA adduct formation by malabaricone C-containing mace extract in the liver of rats exposed to safrole. The data obtained were used to perform a refined risk assessment of safrole. Overall, the results suggest a lower tumor incidence when safrole would be tested within a relevant food matrix containing sulfotransferase inhibitors compared to dosing pure safrole.
Keywords: In vitro; In vivo; Mace; PBBK model; Safrole; Safrole DNA adduct.
Copyright © 2014 Elsevier Ltd. All rights reserved.
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