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Schnöller, L.E.* ; Albrecht, V.* ; Brix, N.* ; Nieto, A.E.* ; Fleischmann, D.F.* ; Niyazi, M.* ; Hess-Rieger, J. ; Belka, C. ; Unger, K. ; Lauber, K. ; Orth, M.*

Integrative analysis of therapy resistance and transcriptomic profiling data in glioblastoma cells identifies sensitization vulnerabilities for combined modality radiochemotherapy.

Radiat. Oncol. 17:79 (2022)
Verlagsversion DOI
Open Access Gold
Creative Commons Lizenzvertrag
Background: Inherent resistance to radio/chemotherapy is one of the major reasons for early recurrence, treatment failure, and dismal prognosis of glioblastoma. Thus, the identification of resistance driving regulators as prognostic and/or predictive markers as well as potential vulnerabilities for combined modality treatment approaches is of pivotal importance. Methods: We performed an integrative analysis of treatment resistance and DNA damage response regulator expression in a panel of human glioblastoma cell lines. mRNA expression levels of 38 DNA damage response regulators were analyzed by qRT-PCR. Inherent resistance to radiotherapy (single-shot and fractionated mode) and/or temozolomide treatment was assessed by clonogenic survival assays. Resistance scores were extracted by dimensionality reduction and subjected to correlation analyses with the mRNA expression data. Top-hit candidates with positive correlation coefficients were validated by pharmacological inhibition in clonogenic survival assays and DNA repair analyses via residual γH2AX/53BP1-foci staining. Results: Inherent resistance to single-shot and similarly also to fractionated radiotherapy showed strong positive correlations with mRNA expression levels of known vulnerabilities of GBM, including PARP1, NBN, and BLM, as well as ATR and LIG4—two so far underestimated targets. Inhibition of ATR by AZD-6738 resulted in robust and dose-dependent radiosensitization of glioblastoma cells, whereas LIG4 inhibition by L189 had no noticeable impact. Resistance against temozolomide showed strong positive correlation with mRNA expression levels of MGMT as to be expected. Interestingly, it also correlated with mRNA expression levels of ATM, suggesting a potential role of ATM in the context of temozolomide resistance in glioblastoma cells. ATM inhibition exhibited slight sensitization effects towards temozolomide treatment in MGMT low expressing glioblastoma cells, thus encouraging further characterization. Conclusions: Here, we describe a systematic approach integrating clonogenic survival data with mRNA expression data of DNA damage response regulators in human glioblastoma cell lines to identify markers of inherent therapy resistance and potential vulnerabilities for targeted sensitization. Our results provide proof-of-concept for the feasibility of this approach, including its limitations. We consider this strategy to be adaptable to other cancer entities as well as other molecular data qualities, and its upscaling potential in terms of model systems and observational data levels deserves further investigation.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Atm ; Atr ; Chemosensitization ; Clonogenic Survival ; Correlation Analysis ; Dna Damage Response ; Glioblastoma ; Lig4 ; Radiosensitization ; Radiotherapy ; Temozolomide ; Therapy Resistance
ISSN (print) / ISBN 1748-717X
e-ISSN 1748-717X
Zeitschrift Radiation Oncology
Quellenangaben Band: 17, Heft: 1, Seiten: , Artikelnummer: 79 Supplement: ,
Verlag BioMed Central
Begutachtungsstatus Peer reviewed
Institut(e) Research Unit Radiation Cytogenetics (ZYTO)
CCG Personalized Radiotherapy in Head and Neck Cancer (KKG-KRT)
Förderungen Ludwig-Maximilians-Universitat Munchen

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