Abstract
Background
Medulloblastoma is the most common pediatric malignant brain tumor, consisting of four molecular subgroups (WNT, SHH, Group 3, Group 4) and 12 subtypes. Expression of the cell surface poliovirus receptor (PVR), CD155, is necessary for entry of the viral immunotherapeutic agent, PVSRIPO, a polio:rhinovirus chimera. CD155, physiologically expressed in the mononuclear phagocytic system, is widely expressed ectopically in solid tumors. The objective of this study is to elucidate CD155 expression as both a receptor for PVSRIPO and a therapeutic target in medulloblastoma.
Methods
PVR mRNA expression was determined in several patient cohorts and human medulloblastoma cell lines. Patient samples were also analyzed for CD155 expression using immunohistochemistry and cell lines were analyzed using Western Blots. CD155 was blocked using a monoclonal antibody and cell viability, invasion, and migration were assessed.
Results and Discussion
PVR mRNA expression was highest in the WNT subgroup and lowest in Group 4. PVR expression in the subgroups of medulloblastoma were similar to other pediatric brain and non-brain tumors. PVR expression was largely not associated with subgroup or subtype. Neither PVR protein expression intensity nor frequency were associated with overall survival. PVR expression was elevated in Group 3 patients with metastases but there was no difference in paired primary and metastatic medulloblastoma. Blocking PVR resulted in dose-dependent cell death, decreased invasion in vitro, and modestly inhibited cell migration.
Conclusions
CD155 is expressed across medulloblastoma subgroups and subtypes. Blocking CD155 results in cell death and decreased cellular invasion. This study provides rationale for CD155-targeting agents including PVSRIPO and antibody-mediated blockade of CD155.
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Acknowledgements
The authors wish to thank lab members for technical support, Beth Perry for IRB assistance, Samuel Dell for technical assistance, and the Preston Robert Tisch Brain Tumor Center personnel for assistance with human specimens.
Funding
EMT: Department of Defense CA171067, Musella Foundation for Brain Tumor Research & Information, Chetna & Meena Trust. The Preston Robert Tisch Brain Tumor Center Biorespository is supported by the Pediatric Brain Tumor Foundation.
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EMT designed research; SL, RM ES, RK, AML, FMGC, MB, and EMT performed research; all authors analyzed and interpreted data, SL and EMT wrote the manuscript. All authors reviewed/revised the manuscript.
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MG and MB own intellectual property related to PVSRIPO, which has been licensed to Istari Oncology, Inc. MG holds equity in Istari Oncology, Inc.; MG and MB received consultancy fees from Istari Oncology, Inc.
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Patient studies were approved by the Duke University Institutional Review Board (Pro00085537).
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Li, S., McLendon, R., Sankey, E. et al. CD155 is a putative therapeutic target in medulloblastoma. Clin Transl Oncol 25, 696–705 (2023). https://doi.org/10.1007/s12094-022-02975-9
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DOI: https://doi.org/10.1007/s12094-022-02975-9