Background Aberrant Sonic Hedgehog/Gli (Hh/Gli) signaling pathway is a critical regulator of Sonic hedgehog medulloblastoma (SHH-MB). Cancer stem cells (CSCs), thought to be largely responsible for tumor initiation, maintenance, dissemination and relapse, have been identified in SHH-MB. Since we previously demonstrated that Hh/Gli signaling controls CSCs features in SHH-MB and that in these tumors miR-326 is down regulated, here we investigated whether there is a functional link between Hh/Gli signaling and miR-326. Methods We evaluated β-arrestin1 (Arrb1) and its intragenic miR-326 levels in CSCs derived from SHH-MB. Subsequently, we modulated the expression of Arrb1 and miR-326 in CSCs in order to gain insight into their biological role. We also analyzed the mechanism by which Arrb1 and miR-326 control Hh/Gli signaling and self-renewal, using luciferase and protein immunoprecipitation assays. Results Low levels of Arrb1 and miR-326 represent a feature of CSCs derived from SHH-MB. We observed that re-expression of Arrb1 and miR-326 inhibits Hh/Gli signaling pathway at multiple levels, which cause impaired proliferation and self-renewal, accompanied by down regulation of Nanog levels. In detail, miR-326 negatively regulates two components of the Hh/Gli pathway the receptor Smoothened (Smo) and the transcription factor Gli2, whereas Arrb1 suppresses the transcriptional activity of Gli1, by potentiating its p300-mediated acetylation. Conclusions Our results identify a new molecular mechanism involving miR-326 and Arrb1 as regulators of SHH-MB CSCs. Specifically, low levels of Arrb1 and miR-326 trigger and maintain Hh/Gli signaling and self-renewal.

β-arrestin1-mediated acetylation of Gli1 regulates Hedgehog/Gli signaling and modulates self-renewal of SHH medulloblastoma cancer stem cells / Miele, Evelina; Po, Agnese; Begalli, Federica; Antonucci, Laura; Mastronuzzi, Angela; Marras, Carlo Efisio; Carai, Andrea; Cucchi, Danilo; Abballe, Luana; Besharat, Zein Mersini; Catanzaro, Giuseppina; Infante, Paola; Di Marcotullio, Lucia; Canettieri, Gianluca; De Smaele, Enrico; Screpanti, Isabella; Locatelli, Franco; Ferretti, Elisabetta. - In: BMC CANCER. - ISSN 1471-2407. - 17:1(2017), p. 488. [10.1186/s12885-017-3477-0]

β-arrestin1-mediated acetylation of Gli1 regulates Hedgehog/Gli signaling and modulates self-renewal of SHH medulloblastoma cancer stem cells

Miele, Evelina;Po, Agnese;Begalli, Federica;Antonucci, Laura;Mastronuzzi, Angela;Cucchi, Danilo;Abballe, Luana;Besharat, Zein Mersini;Catanzaro, Giuseppina;Infante, Paola;Di Marcotullio, Lucia;Canettieri, Gianluca;De Smaele, Enrico;Screpanti, Isabella;Locatelli, Franco;Ferretti, Elisabetta
2017

Abstract

Background Aberrant Sonic Hedgehog/Gli (Hh/Gli) signaling pathway is a critical regulator of Sonic hedgehog medulloblastoma (SHH-MB). Cancer stem cells (CSCs), thought to be largely responsible for tumor initiation, maintenance, dissemination and relapse, have been identified in SHH-MB. Since we previously demonstrated that Hh/Gli signaling controls CSCs features in SHH-MB and that in these tumors miR-326 is down regulated, here we investigated whether there is a functional link between Hh/Gli signaling and miR-326. Methods We evaluated β-arrestin1 (Arrb1) and its intragenic miR-326 levels in CSCs derived from SHH-MB. Subsequently, we modulated the expression of Arrb1 and miR-326 in CSCs in order to gain insight into their biological role. We also analyzed the mechanism by which Arrb1 and miR-326 control Hh/Gli signaling and self-renewal, using luciferase and protein immunoprecipitation assays. Results Low levels of Arrb1 and miR-326 represent a feature of CSCs derived from SHH-MB. We observed that re-expression of Arrb1 and miR-326 inhibits Hh/Gli signaling pathway at multiple levels, which cause impaired proliferation and self-renewal, accompanied by down regulation of Nanog levels. In detail, miR-326 negatively regulates two components of the Hh/Gli pathway the receptor Smoothened (Smo) and the transcription factor Gli2, whereas Arrb1 suppresses the transcriptional activity of Gli1, by potentiating its p300-mediated acetylation. Conclusions Our results identify a new molecular mechanism involving miR-326 and Arrb1 as regulators of SHH-MB CSCs. Specifically, low levels of Arrb1 and miR-326 trigger and maintain Hh/Gli signaling and self-renewal.
2017
Arrb1; CSCs; Gli1 acetylation; Hh/Gli signaling; Medulloblastoma; MiR-326; Oncology; Genetics; Cancer Research
01 Pubblicazione su rivista::01a Articolo in rivista
β-arrestin1-mediated acetylation of Gli1 regulates Hedgehog/Gli signaling and modulates self-renewal of SHH medulloblastoma cancer stem cells / Miele, Evelina; Po, Agnese; Begalli, Federica; Antonucci, Laura; Mastronuzzi, Angela; Marras, Carlo Efisio; Carai, Andrea; Cucchi, Danilo; Abballe, Luana; Besharat, Zein Mersini; Catanzaro, Giuseppina; Infante, Paola; Di Marcotullio, Lucia; Canettieri, Gianluca; De Smaele, Enrico; Screpanti, Isabella; Locatelli, Franco; Ferretti, Elisabetta. - In: BMC CANCER. - ISSN 1471-2407. - 17:1(2017), p. 488. [10.1186/s12885-017-3477-0]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1024175
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