Abstract | BACKGROUND:
Medulloblastoma (MB) comprises four subtypes of which group 3 MB are the most aggressive. Although overall survival for MB has improved, the outcome of group 3 MB remains dismal. C-MYC (MYC) amplification or MYC overexpression which characterizes group 3 MB is a strong negative prognostic factor and is frequently associated with metastases and relapses. We previously reported that MYC expression alone promotes highly aggressive MB phenotypes, in part via repression of thrombospondin-1 (TSP-1), a potent tumor suppressor. METHODS: In this study, we examined the potential role of TSP-1 and TSP-1 peptidomimetic ABT-898 in MYC-amplified human MB cell lines and two distinct murine models of MYC-driven group 3 MBs. RESULTS: We found that TSP-1 reconstitution diminished metastases and prolonged survival in orthotopic xenografts and promoted chemo- and radio-sensitivity via AKT signaling. Furthermore, we demonstrate that ABT-898 can recapitulate the effects of TSP-1 expression in MB cells in vitro and specifically induced apoptosis in murine group 3 MB tumor cells. CONCLUSION:
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Authors | Tiffany S Y Chan, Daniel Picard, Cynthia E Hawkins, Mei Lu, Stefan Pfister, Andrey Korshunov, Martine F Roussel, Robert J Wechsler-Reya, Jack Henkin, Eric Bouffet, Annie Huang |
Journal | Neuro-oncology advances
(Neurooncol Adv)
2021 Jan-Dec
Vol. 3
Issue 1
Pg. vdab002
ISSN: 2632-2498 [Electronic] England |
PMID | 33629064
(Publication Type: Journal Article)
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Copyright | © The Author(s) 2021. Published by Oxford University Press, the Society for Neuro-Oncology and the European Association of Neuro-Oncology. |