Abstract:
:Pineoblastoma is a rare pediatric cancer induced by germline mutations in the tumor suppressors RB1 or DICER1. Presence of leptomeningeal metastases is indicative of poor prognosis. Here we report that inactivation of Rb plus p53 via a WAP-Cre transgene, commonly used to target the mammary gland during pregnancy, induces metastatic pineoblastoma resembling the human disease with 100% penetrance. A stabilizing mutation rather than deletion of p53 accelerates metastatic dissemination. Deletion of Dicer1 plus p53 via WAP-Cre also predisposes to pineoblastoma, albeit with lower penetrance. In silico analysis predicts tricyclic antidepressants such as nortriptyline as potential therapeutics for both pineoblastoma models. Nortriptyline disrupts the lysosome, leading to accumulation of non-functional autophagosome, cathepsin B release and pineoblastoma cell death. Nortriptyline further synergizes with the antineoplastic drug gemcitabine to effectively suppress pineoblastoma in our preclinical models, offering new modality for this lethal childhood malignancy.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Chung PED,Gendoo DMA,Ghanbari-Azarnier R,Liu JC,Jiang Z,Tsui J,Wang DY,Xiao X,Li B,Dubuc A,Shih D,Remke M,Ho B,Garzia L,Ben-David Y,Kang SG,Croul S,Haibe-Kains B,Huang A,Taylor MD,Zacksenhaus Edoi
10.1038/s41467-020-15585-2subject
Has Abstractpub_date
2020-04-14 00:00:00pages
1825issue
1issn
2041-1723pii
10.1038/s41467-020-15585-2journal_volume
11pub_type
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