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Genistein, a soy isoflavone, up-regulates expression of antioxidant genes: involvement of estrogen receptors, ERK1/2, and NFB

Consuelo Borrás, Juan Gambini^*, M. Carmen Gómez-Cabrera, Juan Sastre^*, Federico V. Pallardó, Giovanni E. Mann and Jose Viña^*,1

^* Department of Physiology, School of Medicine, University of Valencia, Valencia, Spain;

Catholic University of Valencia, Valencia, Spain; and

Cardiovascular Division, King’s College London, London, UK

¹Correspondence: Department of Physiology, Universidad de Valencia, Avda. Blasco Ibáñez 17 46010 Valencia, Spain. Email: jose.vina{at}uv.es

ABSTRACT

We have previously reported that estrogens up-regulate longevity-associated genes. As recent evidence has shown that estrogen replacement therapy is associated with an increased risk of cardiovascular disease, we have studied the effects of genistein, a soy isoflavone with a similar structure to estradiol, on the expression of antioxidant, longevity-related genes. MCF-7 cells (human mammary gland tumor cell line) were incubated for 48 h with 0.5 µM genistein, a concentration found in the plasma of populations consuming diets rich in soy protein. Peroxide levels were determined by fluorimetry, activation of extracellular-signal regulated kinase (ERK1/2), and nuclear factor B (NFB)-signaling pathways by Western blot analysis and ELISA, respectively, and mRNA expression of antioxidant genes by real-time reverse transcriptase-polymerase chain reaction (RT-PCR). Inhibition of basal peroxide levels in MCF-7 cells by genistein was prevented by pretreatment of cells with the estrogen receptor antagonist tamoxifen. Phosphorylation of extracellular regulated kinase (ERK)1/2 led to an activation of NFB, as indicated by increased p50 subunit expression in nuclear extracts, and increased mRNA levels of the antioxidant enzyme manganese-superoxide dismutase (MnSOD). Inhibition of ERK1/2 abrogated genistein-mediated NFB activation and elevated expression of MnSOD. Our molecular studies may provide a basis to determine the effects of genistein and other soy protein-derived products on longevity in both animals and the human population.—Borrás, C., Gambini, J., Gómez-Cabrera, M. C., Sastre, J., Pallardó, F. V., Mann, G. E., Viña, J. Genistein, a soy isoflavone, upregulates expression of antioxidant genes: involvement of estrogen receptors, ERK1/2, and NFB.

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