title: Xenoestrogens alter estrogen receptor (ER) α intracellular levels.
abstract: 17β-estradiol (E2)-dependent estrogen receptor (ER) α intracellular concentration is a well recognized critical step in the pleiotropic effects elicited by E2 in several target tissues. Beside E2, a class of synthetic and plant-derived chemicals collectively named endocrine disruptors (EDs) or xenoestrogens bind to and modify both nuclear and extra-nuclear ERα activities. However, at the present no information is available on the ability of EDs to hamper ERα intracellular concentration. Here, the effects of bisphenol A (BPA) and naringenin (Nar), prototypes of synthetic and plant-derived ERα ligands, have been evaluated on ERα levels in MCF-7 cells. Both EDs mimic E2 in triggering ERα Ser118 phosphorylation and gene transcription. However, only E2 or BPA induce an increase of cell proliferation; whereas 24 hrs after Nar stimulation a dose-dependent decrease in cell number is reported. E2 or BPA treatment reduces ERα protein and mRNA levels after 24 hrs. Contrarily, Nar stimulation does not alter ERα content but reduces ERα mRNA levels like other ligands. Co-stimulation experiments indicate that 48 hrs of Nar treatment prevents the E2-induced ERα degradation and hijacks the physiological ability of E2:ERα complex to regulate gene transcription. Mechanistically, Nar induces ERα protein accumulation by preventing proteasomal receptor degradation via persistent activation of p38/MAPK pathway. As a whole these data demonstrate that ERα intracellular concentration is an important target through which EDs hamper the hormonal milieu of E2 target cells driving cells to different outcomes or mimicking E2 even in the absence of the hormone.
authors.affiliation: Department of Science, University Roma Tre, Rome, Italy.
authors.forename: Piergiorgio
authors.initials: P
authors.lastname: La Rosa
authors.affiliation: Department of Science, University Roma Tre, Rome, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Pellegrini
authors.affiliation: Department of Science, University Roma Tre, Rome, Italy.
authors.forename: Pierangela
authors.initials: P
authors.lastname: Totta
authors.affiliation: Department of Science, University Roma Tre, Rome, Italy.
authors.forename: Filippo
authors.initials: F
authors.lastname: Acconcia
authors.affiliation: Department of Science, University Roma Tre, Rome, Italy.
authors.forename: Maria
authors.initials: M
authors.lastname: Marino
mesh_terms: D000704:Analysis of Variance; D001559:Benzhydryl Compounds; D049109:Cell Proliferation / Q000187:drug effects; D017931:DNA Primers / Q000235:genetics; D004305:Dose-Response Relationship, Drug; D052244:Endocrine Disruptors / Q000378:metabolism / Q000494:pharmacology*; D004965:Estrogen Antagonists / Q000378:metabolism / Q000494:pharmacology*; D047628:Estrogen Receptor alpha / Q000378:metabolism*; D004968:Estrogens, Non-Steroidal / Q000378:metabolism / Q000494:pharmacology*; D044950:Flavanones; D006801:Humans; D008156:Luciferases; D061986:MCF-7 Cells; D010636:Phenols; D010766:Phosphorylation / Q000187:drug effects; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014158:Transcription, Genetic / Q000187:drug effects; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D017931:DNA Primers; D052244:Endocrine Disruptors; D004965:Estrogen Antagonists; D047628:Estrogen Receptor alpha; D004968:Estrogens, Non-Steroidal; D044950:Flavanones; D008156:Luciferases; D010636:Phenols; C005273:naringenin; C006780:bisphenol A; D000098826:Bisphenol A Compounds