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Wnt and Notch Signaling Govern Self-Renewal and Differentiation in a Subset of Human Glioblastoma Stem Cells

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Wnt and Notch Signaling Govern Self-Renewal and Differentiation in a Subset of Human Glioblastoma Stem Cells Downloaded from genesdev.cshlp.org on October 3, 2021 - Published by Cold Spring Harbor Laboratory Press Wnt and Notch signaling govern self-renewal and differentiation in a subset of human glioblastoma stem cells Nishani Rajakulendran,1,12 Katherine J. Rowland,2,12 Hayden J. Selvadurai,2 Moloud Ahmadi,1 Nicole I. Park,2,3 Sergey Naumenko,4,5 Sonam Dolma,2 Ryan J. Ward,2 Milly So,2 Lilian Lee,2 Graham MacLeod,1 Clarissa Pasiliao,2,3 Caroline Brandon,2 Ian D. Clarke,2,11 Michael D. Cusimano,4,5 Mark Bernstein,6 Nizar Batada,7 Stephane Angers,1,8 and Peter B. Dirks2,3,9,10 1Leslie Dan Faculty of Pharmacy, Department of Pharmaceutical Sciences, University of Toronto, Toronto, Ontario M5S 3M2, Canada; 2Developmental and Stem Cell Biology Program, Arthur and Sonia Labatt Brain Tumour Research Centre, The Hospital for Sick Children, Toronto, Ontario M5G 0A4, Canada; 3Faculty of Medicine, Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5G 0A4, Canada; 4Genetics and Genome Biology Program, The Hospital for Sick Children, Toronto, Ontario M5G 0A4, Canada; 5St. Michael’s Hospital, Toronto, Ontario M5B 1W8, Canada; 6Toronto Western Hospital, Toronto, Ontario M5T 2S8, Canada; 7Institute of Genetics and Molecular Medicine, Edinburgh EH4 2XU, United Kingdom; 8Faculty of Medicine, Department of Biochemistry, University of Toronto, Toronto, Ontario M5S 1A8, Canada; 9Faculty of Medicine, Department of Surgery, University of Toronto, Toronto, Ontario M5S 1A8, Canada; 10Division of Neurosurgery The Hospital for Sick Children, Toronto, Ontario M5G 1X8, Canada Developmental signal transduction pathways act diversely, with context-dependent roles across systems and disease types. Glioblastomas (GBMs), which are the poorest prognosis primary brain cancers, strongly resemble develop- mental systems, but these growth processes have not been exploited therapeutically, likely in part due to the extreme cellular and genetic heterogeneity observed in these tumors. The role of Wnt/βcatenin signaling in GBM stem cell (GSC) renewal and fate decisions remains controversial. Here, we report context-specific actions of Wnt/ βcatenin signaling in directing cellular fate specification and renewal. A subset of primary GBM-derived stem cells requires Wnt proteins for self-renewal, and this subset specifically relies on Wnt/βcatenin signaling for enhanced tumor burden in xenograft models. In an orthotopic Wnt reporter model, Wnthi GBM cells (which exhibit high levels of βcatenin signaling) are a faster-cycling, highly self-renewing stem cell pool. In contrast, Wntlo cells (with low levels of signaling) are slower cycling and have decreased self-renewing potential. Dual inhibition of Wnt/βcatenin and Notch signaling in GSCs that express high levels of the proneural transcription factor ASCL1 leads to robust neuronal differentiation and inhibits clonogenic potential. Our work identifies new contexts for Wnt modulation for targeting stem cell differentiation and self-renewal in GBM heterogeneity, which deserve further exploration therapeutically. [Keywords: Ascl1; glioblastoma; Notch; Wnt; cancer; differentiation; neuronal; self-renewal] Supplemental material is available for this article. Received October 22, 2018; revised version accepted February 19, 2019. Many tumors contain a hierarchical structure reminis- a unifying therapy for all patients within a given cancer cent of a stem cell system, with more primitive and challenging (Lan et al. 2017). more therapy-resistant cell types, called cancer stem cells Among tumors of the central nervous system (CNS), (CSCs), driving tumorigenicity and confounding thera- glioblastoma (GBM) is the most malignant, with very peutic efficacy (Nguyen et al. 2012; Patel et al. 2014). In poor prognosis and severe limitations in treatment op- addition to demonstrating intratumoral heterogeneity, tu- tions, currently still restricted to radiation and chemo- mors from different patients also typically show specific therapy using the alkylating agent temozolomide. GBM mutations, structural alterations, or transcriptional pro- follows a hierarchical structure, with a small population grams that define individual features that make finding of cells identified to have functional and phenotypic 11Present address: OCAD University, Toronto, Ontario M5T 1W1, Canada. © 2019 Rajakulendran et al. This article is distributed exclusively by 12These authors contributed equally to this work. Cold Spring Harbor Laboratory Press for the first six months after the Corresponding authors: [email protected], peter.dirks@ full-issue publication date (see http://genesdev.cshlp.org/site/misc/ sickkids.ca terms.xhtml). After six months, it is available under a Creative Commons Article available online ahead of print. Article and publication date are on- License (Attribution-NonCommercial 4.0 International), as described at line at http://www.genesdev.org/cgi/doi/10.1101/gad.321968.118. http://creativecommons.org/licenses/by-nc/4.0/. GENES & DEVELOPMENT 33:1–13 Published by Cold Spring Harbor Laboratory Press; ISSN 0890-9369/19; www.genesdev.org 1 Downloaded from genesdev.cshlp.org on October 3, 2021 - Published by Cold Spring Harbor Laboratory Press Rajakulendran et al. similarities to neural stem cells (Galli et al. 2004; Singh the LEF/TCF family of transcription factors to regulate et al. 2004; Tirosh et al. 2016; Lan et al. 2017) that are de- context-dependent expression of Wnt target genes such fined as GBM stem cells (GSCs). GSCs are resistant to che- as AXIN2 and NKD1. In the developing brain, Wnt/βcate- motherapy and radiotherapy (Bao et al. 2006; Chen et al. nin signaling promotes NSC self-renewal and proliferation 2012) and therefore contribute to tumor recurrence. It is (Chenn and Walsh 2002; Lie et al. 2005; Kalani et al. 2008) therefore fundamentally important to understand the un- and regulates the anterior–posterior patterning of the ner- derlying biology of GSCs to develop new strategies to vous system (Ciani and Salinas 2005). During later stages eliminate them along with the bulk of the tumor. of neurogenesis, Wnt/βcatenin signaling is required for During embryonic development and adult tissue ho- specification of neuronal subtypes (Israsena et al. 2004; meostasis, a recurrent number of signaling pathways con- Kuwabara et al. 2009; Munji et al. 2011). Several studies trolled by secreted growth factors such as Notch, Wnt, have implicated dysregulated Wnt signaling in GBM de- Hedgehog, and TGFβ govern core processes in stem and spite the absence of genetic alterations within known progenitor cells that include self-renewal, proliferation, pathway components such as APC or βcatenin (Reya and differentiation, and migration (Moore and Lemischka Clevers 2005). For example, the forkhead transcription fac- 2006; Clevers et al. 2014). Reactivation or subversion of tor FOXM1 promotes the nuclear translocation of βcatenin these pathways in cancer frequently contributes to tumor in GBM and contributes to pathway activation and GSC progression as a result of uncontrolled growth, differenti- self-renewal (Hodgson et al. 2009; Zhang et al. 2011). In ation failure, or invasion (Dreesen and Brivanlou 2007; GSCs, Wnt signaling pathway components can be up-reg- Azzarelli et al. 2018). Numerous studies, including fate ulated indirectly due to genetic modifications in other mapping of in vivo barcoded primary GBM cells (Lan genes such as overexpression of PLAGL2, which is neces- et al. 2017), strongly support the concept that GBM is driv- sary for self-renewal and can up-regulate Wnt signaling en by a growth process that is highly reminiscent of a pathway members (Zheng et al. 2010). In addition, aber- developmental hierarchy based on rare stem cells. Inter- rant regulation of a transcriptional network controlled by estingly, one of the biggest phenotypic differences with ASCL1 represses DKK1 expression, a negative regulator normal neural stem cells appears to be the decreased dif- of Wnt/βcatenin signaling, and leads to increased Wnt sig- ferentiation potential of GSCs following growth factor naling in GBM (Rheinbay et al. 2013). Supporting a func- withdrawal. Strategies that overcome differentiation fail- tionally important role for the Wnt/βcatenin pathway in ure in GBM to restrict uncontrolled expansion of GSCs GBM, small molecule inhibitors of the acyltransferase Por- and favor generation of more mature cells with limited cupine (PORCN), which blocks the palmitoylation of Wnt proliferative capacity may therefore represent attractive proteins and consequently their secretion and activity, in- therapeutic opportunities. For example, we recently un- hibit the proliferation and clonogenic potential of GSCs in covered that a subset of GSCs expressing a relatively vitro and tumor progression in vivo (Kahlert et al. 2015; high level of the proneural transcription factor ASCL1 re- Huang et al. 2016). This finding was also supported by tain developmental neurogenic capacity (Park et al. 2017). the discovery that Wntless (WLS), which is also involved We demonstrated that the latent neuronal differentiation in Wnt ligand secretion, is highly expressed in gliomas, potential of ASCL1hi GSCs can be therapeutically un- and knockout of WLS results in a reduction of prolifera- masked by modulating Notch signaling, using γ secretase tion, clonogenic growth, and invasion (Augustin et al. inhibitors, to promote neuronal differentiation, decrease 2012). self-renewal, and restrict their tumorigenic potential In this study, we uncovered that
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