title: Survival versus apoptotic 17beta-estradiol effect: role of ER alpha and ER beta activated non-genomic signaling.
abstract: The capability of 17beta-estradiol (E2) to induce the non-genomic activities of its receptors (ER alpha and ER beta) and to evoke different signaling pathways committed to the regulation of cell proliferation has been analyzed in different cell cancer lines containing transfected (HeLa) or endogenous (HepG2, DLD1) ER alpha or ER beta. In these cell lines, E2 induced different effects on cell growth/apoptosis in dependence of ER isoforms present. The E2-ER alpha complex rapidly activated multiple signal transduction pathways (i.e., ERK/MAPK, PI3K/AKT) committed to both cell cycle progression and apoptotic cascade prevention. On the other hand, the E2-ER beta complex induced the rapid and persistent phosphorylation of p38/MAPK which, in turn, was involved in caspase-3 activation and cleavage of poly(ADP-ribose)polymerase, driving cells into the apoptotic cycle. In addition, the E2-ER beta complex did not activate any of the E2-ER alpha-activated signal molecules involved in cell growth. Taken together, these results demonstrate the ability of ER beta isoform to activate specific signal transduction pathways starting from plasma membrane that may justify the effect of E2 in inducing cell proliferation or apoptosis in cancer cells. In particular this hormone promotes cell survival through ER alpha non-genomic signaling and cell death through ER beta non-genomic signaling.
authors.affiliation: Department of Biology, University Roma Tre, Rome, Italy.
authors.forename: Filippo
authors.initials: F
authors.lastname: Acconcia
authors.forename: Pierangela
authors.initials: P
authors.lastname: Totta
authors.forename: Sumito
authors.initials: S
authors.lastname: Ogawa
authors.forename: Irene
authors.initials: I
authors.lastname: Cardillo
authors.forename: Satoshi
authors.initials: S
authors.lastname: Inoue
authors.forename: Stefano
authors.initials: S
authors.lastname: Leone
authors.forename: Anna
authors.initials: A
authors.lastname: Trentalance
authors.forename: Masami
authors.initials: M
authors.lastname: Muramatsu
authors.forename: Maria
authors.initials: M
authors.lastname: Marino
mesh_terms: D017209:Apoptosis / Q000187:drug effects* / Q000502:physiology; D002455:Cell Division / Q000502:physiology; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects / Q000502:physiology; D004958:Estradiol / Q000494:pharmacology*; D047628:Estrogen Receptor alpha / Q000378:metabolism*; D047629:Estrogen Receptor beta / Q000378:metabolism*; D018014:Gene Transfer Techniques; D006801:Humans; D020239:Receptor Cross-Talk / Q000502:physiology; D015398:Signal Transduction / Q000187:drug effects* / Q000502:physiology; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: D047628:Estrogen Receptor alpha; D047629:Estrogen Receptor beta; D004958:Estradiol; D048051:p38 Mitogen-Activated Protein Kinases