Retinoic Acid Sensitivity of Triple-Negative Breast Cancer Cells Characterized by Constitutive Activation of the notch1 Pathway: The Role of Rarβ

Triple-negative breast cancer (TNBC) is a heterogeneous disease that lacks effective therapeutic options. In this study, we profile eighteen TNBC cell lines for their sensitivity to the anti-proliferative action of all-trans retinoic acid (ATRA). The only three cell lines (HCC-1599, MB-157 and MDA-M...

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Veröffentlicht in:Cancers 2020-10, Vol.12 (10), p.3027
Hauptverfasser: Paroni, Gabriela, Zanetti, Adriana, Barzago, Maria Monica, Kurosaki, Mami, Guarrera, Luca, Fratelli, Maddalena, Troiani, Martina, Ubezio, Paolo, Bolis, Marco, Vallerga, Arianna, Biancardi, Federica, Terao, Mineko, Garattini, Enrico
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container_issue 10
container_start_page 3027
container_title Cancers
container_volume 12
creator Paroni, Gabriela
Zanetti, Adriana
Barzago, Maria Monica
Kurosaki, Mami
Guarrera, Luca
Fratelli, Maddalena
Troiani, Martina
Ubezio, Paolo
Bolis, Marco
Vallerga, Arianna
Biancardi, Federica
Terao, Mineko
Garattini, Enrico
description Triple-negative breast cancer (TNBC) is a heterogeneous disease that lacks effective therapeutic options. In this study, we profile eighteen TNBC cell lines for their sensitivity to the anti-proliferative action of all-trans retinoic acid (ATRA). The only three cell lines (HCC-1599, MB-157 and MDA-MB-157) endowed with ATRA-sensitivity are characterized by genetic aberrations of the NOTCH1-gene, causing constitutive activation of the NOTCH1 γ-secretase product, N1ICD. N1ICD renders HCC-1599, MB-157 and MDA-MB-157 cells sensitive not only to ATRA, but also to γ-secretase inhibitors (DAPT; PF-03084014). Combinations of ATRA and γ-secretase inhibitors produce additive/synergistic effects in vitro and in vivo. RNA-sequencing studies of HCC-1599 and MB-157 cells exposed to ATRA and DAPT and ATRA+DAPT demonstrate that the two compounds act on common gene sets, some of which belong to the NOTCH1 pathway. ATRA inhibits the growth of HCC-1599, MB-157 and MDA-MB-157 cells via RARα, which up-regulates several retinoid target-genes, including RARβ. RARβ is a key determinant of ATRA anti-proliferative activity, as its silencing suppresses the effects exerted by the retinoid. In conclusion, we demonstrate that ATRA exerts a significant anti-tumor action only in TNBC cells showing constitutive NOTCH1 activation. Our results support the design of clinical trials involving combinations between ATRA and γ-secretase inhibitors for the treatment of this TNBC subtype.
doi_str_mv 10.3390/cancers12103027
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source MDPI - Multidisciplinary Digital Publishing Institute; PubMed Central; EZB Electronic Journals Library; PubMed Central Open Access
subjects Breast cancer
Cell activation
Clinical trials
DNA methylation
Gene expression
Leukemia
Ligands
Notch1 protein
Retinoic acid
Secretase
Signal transduction
Tumors
Vitamin A
title Retinoic Acid Sensitivity of Triple-Negative Breast Cancer Cells Characterized by Constitutive Activation of the notch1 Pathway: The Role of Rarβ
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