Ouabain and Digoxin Activate the Proteasome and the Degradation of the Erα in Cells Modeling Primary and Metastatic Breast Cancer
cancers Article Ouabain and Digoxin Activate the Proteasome and the Degradation of the ERα in Cells Modeling Primary and Metastatic Breast Cancer 1, 1, 2 3 Claudia Busonero y, Stefano Leone y, Fabrizio Bianchi , Elena Maspero , Marco Fiocchetti 1, Orazio Palumbo 4 , Manuela Cipolletti 1, Stefania Bartoloni 1 and Filippo Acconcia 1,* 1 Department of Sciences, Section Biomedical Sciences and Technology, University Roma Tre, Viale Guglielmo Marconi, 446, I-00146 Rome, Italy; claudia.busonero@uniroma3.it (C.B.); stefano.leone@uniroma3.it (S.L.); marco.fiocchetti@uniroma3.it (M.F.); manuela.cipolletti@uniroma3.it (M.C.); stefania.bartoloni2@uniroma3.it (S.B.) 2 Cancer Biomarkers Unit, Fondazione IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo (FG), Italy; f.bianchi@operapadrepio.it 3 Fondazione Istituto FIRC di Oncologia Molecolare (IFOM), 20139 Milan, Italy; elena.maspero@ifom.eu 4 Division of Medical Genetics, Fondazione IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo (FG), Italy; o.palumbo@operapadrepio.it * Correspondence: filippo.acconcia@uniroma3.it; Tel.: +39-065-733-6320; Fax: +39-065-733-6321 These authors contributed equally to this work. y Received: 25 November 2020; Accepted: 17 December 2020; Published: 19 December 2020 Simple Summary: Breast cancer (BC) treatment relies on the detection of the estrogen receptor α (ERα). ERα-expressing BC patients are treated with anti-estrogen drugs (i.e., tamoxifen and fulvestrant). Despite their proven efficacy, these drugs cause serious side effects in a significant fraction of the patients, including both tumor insurgence in secondary organs, and resistant phenotypes, which result in a relapsing disease with scarce treatment options.
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