期刊
CLINICAL CANCER RESEARCH
卷 27, 期 6, 页码 1766-1777出版社
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/1078-0432.CCR-20-1499
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资金
- NIH [R01NS087990, R01NS106379, R33 NS101150, P50CA221747]
- ORIP of the NIH [P40OD011050]
- Northwestern University Flow Cytometry Core Facility - NCI [P30-CA060553]
- Center for Advanced Microscopy - NCI [P30-CA060553]
- Mouse Histology and Phenotyping Laboratory - NCI [P30-CA060553]
The study demonstrates that oncolytic virus loaded MSCs can efficiently deliver to DIPG cells and release within brainstem xenografts in mice, leading to prolonged survival when combined with radiotherapy.
Purpose: Diffuse intrinsic pontine glioma (DIPG) is among the deadliest of pediatric brain tumors. Radiotherapy is the standard-of-care treatment for DIPG, but offers only transient relief of symptoms for patients with DIPG without providing significant survival benefit. Oncolytic virotherapy is an anticancer treatment that has been investigated for treating various types of brain tumors. Experimental Design: Here, we have explored the use of mesenchymal stem cells (MSC) for oncolytic virus (OV) delivery and evaluated treatment efficacy using preclinical models of DIPG. The survivin promoter drives the conditional replication of OV used in our studies. The efficiency of OV entry into the cells is mediated by fiber modification with seven lysine residues (CRAd.S.pK7). Patients' samples and cell lines were analyzed for the expression of viral entry proteins and survivin. The ability of MSCs to deliver OV to DIPG was studied in the context of a low dose of irradiation. Results: Our results show that DIPG cells and tumors exhibit robust expression of cell surface proteins and survivin that enable efficient OV entry and replication in DIPG cells. MSCs loaded with OV disseminate within a tumor and release OV throughout the DIPG brainstem xenografts in mice. Administration of OV-loaded MSCs with radiotherapy to mice bearing brainstem DIPG xenografts results in more prolonged survival relative to that conferred by either therapy alone (P < 0.01). Conclusions: Our study supports OV, CRAd.S.pK7, encapsulated within MSCs as a therapeutic strategy that merits further investigation and potential translation for DIPG treatment.
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