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• W2056563992 endingPage "1121" @default.
• W2056563992 startingPage "1112" @default.
• W2056563992 abstract "Medulloblastoma (MD) is the most common malignant brain tumor in children. These invasive neuroectodermal tumors arise from cerebellar granule cell-like precursors. In the developing cerebellum, estrogen influences growth and viability of granule cell precursors that transiently express elevated levels estrogen receptor-β (ERβ) during differentiation. Immunoanalysis revealed that ERβ was expressed in the maturing human cerebellum, in all 22 primary MD tumors analyzed, and in two MD-derived cell lines (D283Med and Daoy). Very low levels of ERα-like proteins were detected in each cell line and 41% of tumor samples. Physiological concentrations of the 17β-estradiol- or the ERβ-selective agonist 2,3-bis(4-hydroxyphenyl)-propionitrile diarylpropionitrile dose-dependently increased MD growth and cellular migration. In contrast, the ERα-selective agonist (4-propyl-[1H]pyrazole-1,3,5-triyl) trisphenol did not influence MD growth. Similar to previous studies in normal cerebellar granule cell precursors, these studies demonstrate that the physiological actions of estrogens in MD are mediated by ERβ. Preclinical studies assessing the therapeutic efficacy of antiestrogen chemotherapeutics for treating human MD were performed. It was found that pharmacological inhibition of ER-mediated signaling with the ER antagonist drug Faslodex (ICI182,780) blocked all estrogen-mediated effects in both cell culture and xenograft models of human MD. These studies have revealed that functional ERβ expression is a fundamental aspect of MD biology and has defined antiestrogen therapy as a potentially efficacious clinical approach to improve the long-term outcomes for MD patients. Estrogens, via ERβ, stimulate growth of medulloblastoma. ICI182,780 and the antiestrogen drug Faslodex block estrogen-stimulated tumor growth in vitro and in xenograft models of medulloblastoma." @default.
• W2056563992 created "2016-06-24" @default.
• W2056563992 creator A5020032394 @default.
• W2056563992 creator A5066033278 @default.
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• W2056563992 date "2008-11-13" @default.
• W2056563992 modified "2023-10-04" @default.
• W2056563992 title "Blockade of Estrogen Receptor Signaling Inhibits Growth and Migration of Medulloblastoma" @default.
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• W2056563992 doi "https://doi.org/10.1210/en.2008-1363" @default.
• W2056563992 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2654749" @default.
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