Mesenchymal stem cell carriers enhance antitumor efficacy of oncolytic adenoviruses in an immunocompetent mouse model

Oncotarget
Esther RincónJ García-Castro

Abstract

Oncolytic virotherapy represents a promising alternative for cancer treatment; however, viral delivery to the tumor represents a major challenge. Mesenchymal stem cells (MSCs) chemotax to tumors, and can serve as a viral delivery tool. Previously, we demonstrated antitumor therapeutic efficacy for mesenchymal stem cells (MSCs) infected with the oncolytic human adenovirus ICOVIR5 (Celyvir) for treatment of neuroblastoma patients. Given the lack of suitable immunocompetent preclinical models, the mechanism underlying Celyvir antitumor activity remains unknown. In this study, we used the syngeneic murine CMT64 cell line as a human adenovirus-semi-permissive tumor model and demonstrate the homing capacity of mouse Celyvir (mCelyvir) to CMT64 tumors. We found that the combined treatment of mCelyvir and intratumoral injections (i.t.) of ICOVIR5 was more effective than treatment with i.t. ICOVIR5 alone. Interestingly, the superior therapeutic effect of the combined therapy was associated with a higher tumor infiltration of CD8+ and CD4+ T cells. Our findings suggest that the use of MSCs as carriers of oncolytic adenovirus can improve the clinical efficacy of anti-cancer virotherapy, not only by driving the adenovirus to tumors, but al...Continue Reading

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Citations

May 17, 2019·Immunotherapy·Parnian JabbariNima Rezaei
Aug 6, 2019·Stem Cells·Sanam L Kavari, Khalid Shah
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Methods Mentioned

BETA
genetic modification
xenografts
fluorescence microscopy
PCR
FACS
flow cytometry
confocal microscopy
ELISA
Assay
fluorescence-activated cell sorting

Clinical Trials Mentioned

NCT02068794
NCT01844661

Software Mentioned

StataSE12
FlowJo
LAS AF
GraphPad Prism
Living Image

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