Enterolactone induces heme oxygenase-1 expression through nuclear factor-E2-related factor 2 activation in endothelial cells - PubMed (original) (raw)
. 2008 Jul;138(7):1263-8.
doi: 10.1093/jn/138.7.1263.
Affiliations
- PMID: 18567745
- DOI: 10.1093/jn/138.7.1263
Free article
Enterolactone induces heme oxygenase-1 expression through nuclear factor-E2-related factor 2 activation in endothelial cells
Annukka M Kivelä et al. J Nutr. 2008 Jul.
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Abstract
Enterolactone is a lignan formed by enterobacteria from precursors in plant foods. Due to its phenolic structure, it can act as an antioxidant, e.g. via direct scavenging of hydroxyl radical. Moreover, many, but not all, phenolic compounds can have indirect antioxidative effects through induction of heme oxygenase-1 (HO-1), which has antiinflammatory functions via production of antioxidants bilirubin and biliverdin as well as carbon monoxide, thereby contributing to cardiovascular health. Our aim was therefore to assess whether enterolactone has indirect antioxidative effects via induction of HO-1 in endothelial cells. The effect of enterolactone on HO-1 mRNA and protein expression in human umbilical vein endothelial cells (HUVEC) was analyzed by quantitative real-time PCR and western blot. The role of nuclear factor-E2-related factor 2 (Nrf2) in HO-1 induction by enterolactone was studied using small interfering RNA (siRNA) and chromatin immunoprecipitation (ChIP) methods. Our results showed that enterolactone induced HO-1 in HUVEC in a time- and concentration-dependent manner. The induction appeared to be mediated via the transcription factor Nrf2, as Nrf2 siRNA abolished the HO-1 induction by enterolactone. We also showed using ChIP that exposure to enterolactone increased the binding of Nrf2 to the promoter region of HO-1. In conclusion, enterolactone increases the expression of HO-1 via Nrf2, which may contribute to its vasculoprotective effects.
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