Monotherapy efficacy of blood-brain barrier permeable small molecule reactivators of protein phosphatase 2A in glioblastoma

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http://hdl.handle.net/10138/320603

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Merisaari , J , Denisova , O , Doroszko , M , Le Joncour , V , Johansson , P , Leenders , W P J , Kastrinsky , D B , Zaware , N , Narla , G , Laakkonen , P , Nelander , S , Ohlmeyer , M & Westermarck , J 2020 , ' Monotherapy efficacy of blood-brain barrier permeable small molecule reactivators of protein phosphatase 2A in glioblastoma ' , Brain communications , vol. 2 , no. 1 , 02 . https://doi.org/10.1093/braincomms/fcaa002

Title: Monotherapy efficacy of blood-brain barrier permeable small molecule reactivators of protein phosphatase 2A in glioblastoma
Author: Merisaari, Joni; Denisova, Oxana; Doroszko, Milena; Le Joncour, Vadim; Johansson, Patrik; Leenders, William P. J.; Kastrinsky, David B.; Zaware, Nilesh; Narla, Goutham; Laakkonen, Pirjo; Nelander, Sven; Ohlmeyer, Michael; Westermarck, Jukka
Contributor: University of Helsinki, CAN-PRO - Translational Cancer Medicine Program
University of Helsinki, Helsinki Institute of Life Science HiLIFE, Infra
Date: 2020
Language: eng
Number of pages: 12
Belongs to series: Brain communications
ISSN: 2632-1297
URI: http://hdl.handle.net/10138/320603
Abstract: Glioblastoma is a fatal disease in which most targeted therapies have clinically failed. However, pharmacological reactivation of tumour suppressors has not been thoroughly studied as yet as a glioblastoma therapeutic strategy. Tumour suppressor protein phosphatase 2A is inhibited by non-genetic mechanisms in glioblastoma, and thus, it would be potentially amendable for therapeutic reactivation. Here, we demonstrate that small molecule activators of protein phosphatase 2A, NZ-8-061 and DBK-1154, effectively cross the in vitro model of blood-brain barrier, and in vivo partition to mouse brain tissue after oral dosing. In vitro, small molecule activators of protein phosphatase 2A exhibit robust cell-killing activity against five established glioblastoma cell lines, and nine patient-derived primary glioma cell lines. Collectively, these cell lines have heterogeneous genetic background, kinase inhibitor resistance profile and stemness properties; and they represent different clinical glioblastoma subtypes. Moreover, small molecule activators of protein phosphatase 2A were found to be superior to a range of kinase inhibitors in their capacity to kill patient-derived primary glioma cells. Oral dosing of either of the small molecule activators of protein phosphatase 2A significantly reduced growth of infiltrative intracranial glioblastoma tumours. DBK-1154, with both higher degree of brain/blood distribution, and more potent in vitro activity against all tested glioblastoma cell lines, also significantly increased survival of mice bearing orthotopic glioblastoma xenografts. In summary, this report presents a proof-of-principle data for blood-brain barrier-permeable tumour suppressor reactivation therapy for glioblastoma cells of heterogenous molecular background. These results also provide the first indications that protein phosphatase 2A reactivation might be able to challenge the current paradigm in glioblastoma therapies which has been strongly focused on targeting specific genetically altered cancer drivers with highly specific inhibitors. Based on demonstrated role for protein phosphatase 2A inhibition in glioblastoma cell drug resistance, small molecule activators of protein phosphatase 2A may prove to be beneficial in future glioblastoma combination therapies.
Subject: PME-1
CIP2A
DT-061
E98
tricyclic neurological drugs
GENE-EXPRESSION
GLIOMA MODELS
CANCER
IDENTIFICATION
SUBTYPES
TARGET
EGFR
3112 Neurosciences
3124 Neurology and psychiatry
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