title: Estrogen-independent activation of erbBs signaling and estrogen receptor alpha in the mouse vagina exposed neonatally to diethylstilbestrol.
abstract: Growth factors and estrogen receptor (ER) signaling cooperate to play essential roles in cell proliferation, differentiation and tumor progression in mouse reproductive organs. Treatment of neonatal mice with diethylstilbestrol (DES) induces an estrogen-independent persistent proliferation and cornification of the vaginal epithelium, which results in cancerous lesions later in life. However, the mechanisms of the estrogen-dependent and -independent pathways essentially remain unknown. We characterized the expression of epidermal growth factor (EGF)-like growth factors (EGF, transforming growth factor alpha (TGF-alpha), heparin-binding EGF-like growth factor (HB-EGF), betacellulin (BTC), amphiregulin (APR), epiregulin (EPR) and neuregulin (NRG) 1) and erbB receptors (EGF receptor (EGFR), erbB2/neu, erbB3 and erbB4) in the vaginae of mice treated either neonatally (0-4 day) or as adults (55-59 day) with estrogens. EGFR and erbB2 were activated in the vaginal epithelium of mice by estrogen treatment. This activation was also encountered in vaginae from neonatally DES-exposed mice, along with the expression of EGF, TGF-alpha, HB-EGF, BTC, APR, EPR and NRG1. Immunohistochemical analysis indicated that erbB2 was primarily expressed in vaginal epithelium. Finally, we found that serine 118 and 167 located in the AF-1 domain of ERalpha were phosphorylated in these vaginae. AG825, AG1478 or ICI 182,780 administration blocked proliferation of vaginal epithelium induced by neonatal DES exposure. Thus, signal transduction via EGFR and erbB2 could be related to the estrogen-induced vaginal changes and persistent erbBs phosphorylation and sustained expression of EGF-like growth factors, leading to ERalpha activation that may result in cancerous lesions in vaginae from neonatally DES-exposed mice later in life.
authors.affiliation: Department of Molecular Biomechanics, School of Life Science, The Graduate University for Advanced Studies, Okazaki 444-8585, Japan.
authors.forename: Shinichi
authors.initials: S
authors.lastname: Miyagawa
authors.forename: Yoshinao
authors.initials: Y
authors.lastname: Katsu
authors.forename: Hajime
authors.initials: H
authors.lastname: Watanabe
authors.forename: Taisen
authors.initials: T
authors.lastname: Iguchi
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D002455:Cell Division / Q000187:drug effects; D004054:Diethylstilbestrol / Q000494:pharmacology*; D004815:Epidermal Growth Factor / Q000494:pharmacology; D004847:Epithelial Cells / Q000166:cytology / Q000187:drug effects; D066246:ErbB Receptors / Q000235:genetics / Q000378:metabolism*; D004958:Estradiol / Q000031:analogs & derivatives* / Q000494:pharmacology; D047628:Estrogen Receptor alpha; D004967:Estrogens / Q000494:pharmacology; D005260:Female; D000077267:Fulvestrant; D051379:Mice; D008810:Mice, Inbred C57BL; D010766:Phosphorylation / Q000187:drug effects; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000235:genetics / Q000378:metabolism*; D011960:Receptors, Estrogen / Q000378:metabolism*; D015398:Signal Transduction / Q000187:drug effects*; D014621:Vagina / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism* / Q000473:pathology
chemical_list: D004054:Diethylstilbestrol; D004815:Epidermal Growth Factor; D066246:ErbB Receptors; D004958:Estradiol; D047628:Estrogen Receptor alpha; D004967:Estrogens; D000077267:Fulvestrant; D018719:Erb-b2 Receptor Tyrosine Kinases; D011960:Receptors, Estrogen