Abstract
Genistein and daidzein are the main isoflavones in soy. Their potential beneficial or adverse effects in males like the prevention of prostate cancer or the impact on reproductive functions are controversially discussed. Major determinants of their bioactivity are the absorption and biotransformation of isoflavones. In this study, we focused on the influence of testosterone on plasma availability and phase II metabolism of isoflavones. Male Wistar rats, receiving an isoflavones rich diet, were randomized into three groups: Two groups were orchiectomized (ORX) at postnatal day (PND) 80 and treated for 11 days with testosterone propionate (TP) (ORX TP group) or a vehicle (ORX group) after a 7 days lasting hormonal decline. The third group served as control and remained intact. Rats were sacrificed at PND 98. ORX rats had reduced isoflavones plasma levels. Differently regulated mRNA expressions of transporters relevant for transport of phase II metabolites in liver and kidney may be responsible for this reduction, more precisely Slc10a1 and Slc21a1 in kidney as well as Slc22a8 in liver. While main phase II metabolites in intact rats were disulfates and sulfoglucuronides, the amount of sulfate conjugates was significantly diminished by ORX. In accordance with that, mRNA expression of different sulfotransferases was reduced in liver by ORX. The observed effects could be almost restored by TP treatment. In conclusion, testosterone, and likely further androgens, has a huge impact on phase II metabolism and availability of isoflavones by influencing the expression of different sulfotransferases and transporters.
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Abbreviations
- 1A:
-
Cytochrome-c-oxidase subunit 1A
- Abc:
-
ATP-binding cassette transporters
- Bcrp:
-
Breast cancer resistance protein
- DAI:
-
Daidzein
- DS:
-
Disulfate
- G:
-
Glucuronide
- GEN:
-
Genistein
- ISO:
-
Isoflavones
- Mrp:
-
Multidrug resistance-associated protein
- Ntcp:
-
Na+-taurocholate cotransporting polypeptide
- Oat:
-
Organic anion transporter
- Oatp:
-
Organic anion transporting polypeptide
- ORX:
-
Orchiectomy
- PND:
-
Postnatal day
- S:
-
Sulfate
- Slc:
-
Solute carrier
- Sult:
-
Sulfotransferase
- TP:
-
Testosterone propionate
- Ugt:
-
UDP-glucuronosyltransferase
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Acknowledgments
The authors thank Dr. Alexander Roth for his support with the statistical analysis of the data and Ute Laudenbach-Leschowsky for her support during the conduction of the animal experiment. Parts of the work were funded by the German Research Foundation (DFG), Grant KU-1079/9-1 and DI-716/12-2. This DFG project is part of the collaborative research project entitled IsoCross “Isoflavones: Cross-species comparison of metabolism, estrogen sensitivity, epigenetics and carcinogenesis”.
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Sebastian T. Soukup and Dennis R. Müller have contributed equally to this work.
Parts of the work (body and prostate weights as well as food intake and ISO overall plasma levels, presented in this manuscript in Supplementary Fig. 1 and Table 2) were previously presented in the manuscript investigating the influence of ISO on development and androgen sensitivity in male rats (Müller et al. 2016).
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Soukup, S.T., Müller, D.R., Kurrat, A. et al. Influence of testosterone on phase II metabolism and availability of soy isoflavones in male Wistar rats. Arch Toxicol 91, 1649–1661 (2017). https://doi.org/10.1007/s00204-016-1853-1
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DOI: https://doi.org/10.1007/s00204-016-1853-1