Background Pediatric high-grade gliomas (pHGGs) are among the most common and incurable malignant neoplasms of childhood. Despite aggressive, multimodal treatment, the outcome of children with high-grade gliomas has not significantly improved over the past decades, prompting the development of innovative approaches. Methods To develop an effective treatment, we aimed at improving the suboptimal antitumor efficacy of oncolytic adenoviruses (OAs) by testing the combination with a gene-therapy approach using a bispecific T-cell engager (BiTE) directed towards the erythropoietin-producing human hepatocellular carcinoma A2 receptor (EphA2), conveyed by a replication-incompetent adenoviral vector (EphA2 adenovirus (EAd)). The combinatorial approach was tested in vitro, in vivo and thoroughly characterized at a molecular level. Results After confirming the relevance of EphA2 as target in pHGGs, documenting a significant correlation with worse clinical outcome of the patients, we showed that the proposed strategy provides significant EphA2-BiTE amplification and enhanced tumor cell apoptosis, on coculture with T cells. Moreover, T-cell activation through an agonistic anti-CD28 antibody further increased the activation/proliferation profiles and functional response against infected tumor cells, inducing eradication of highly resistant, primary pHGG cells. The gene-expression analysis of tumor cells and T cells, after coculture, revealed the importance of both EphA2-BiTE and costimulation in the proposed system. These in vitro observations translated into significant tumor control in vivo, in both subcutaneous and a more challenging orthotopic model. Conclusions The combination of OA and EphA2-BiTE gene therapy strongly enhances the antitumor activity of OA, inducing the eradication of highly resistant tumor cells, thus supporting the clinical translation of the approach.

Oncolytic adenovirus and gene therapy with epha2-bite for the treatment of pediatric high-grade gliomas / Arnone, C. M.; Polito, V. A.; Mastronuzzi, A.; Carai, A.; Diomedi, F. C.; Antonucci, L.; Petrilli, L. L.; Vinci, M.; Ferrari, F.; Salviato, E.; Scarsella, M.; De Stefanis, C.; Weber, G.; Quintarelli, C.; De Angelis, B.; Brenner, M. K.; Gottschalk, S.; Hoyos, V.; Locatelli, F.; Caruana, I.; Del Bufalo, F.. - In: JOURNAL FOR IMMUNOTHERAPY OF CANCER. - ISSN 2051-1426. - 9:5(2021), pp. 1-15. [10.1136/jitc-2020-001930]

Oncolytic adenovirus and gene therapy with epha2-bite for the treatment of pediatric high-grade gliomas

Arnone C. M.
Membro del Collaboration Group
;
Antonucci L.
Membro del Collaboration Group
;
Locatelli F.
Supervision
;
2021

Abstract

Background Pediatric high-grade gliomas (pHGGs) are among the most common and incurable malignant neoplasms of childhood. Despite aggressive, multimodal treatment, the outcome of children with high-grade gliomas has not significantly improved over the past decades, prompting the development of innovative approaches. Methods To develop an effective treatment, we aimed at improving the suboptimal antitumor efficacy of oncolytic adenoviruses (OAs) by testing the combination with a gene-therapy approach using a bispecific T-cell engager (BiTE) directed towards the erythropoietin-producing human hepatocellular carcinoma A2 receptor (EphA2), conveyed by a replication-incompetent adenoviral vector (EphA2 adenovirus (EAd)). The combinatorial approach was tested in vitro, in vivo and thoroughly characterized at a molecular level. Results After confirming the relevance of EphA2 as target in pHGGs, documenting a significant correlation with worse clinical outcome of the patients, we showed that the proposed strategy provides significant EphA2-BiTE amplification and enhanced tumor cell apoptosis, on coculture with T cells. Moreover, T-cell activation through an agonistic anti-CD28 antibody further increased the activation/proliferation profiles and functional response against infected tumor cells, inducing eradication of highly resistant, primary pHGG cells. The gene-expression analysis of tumor cells and T cells, after coculture, revealed the importance of both EphA2-BiTE and costimulation in the proposed system. These in vitro observations translated into significant tumor control in vivo, in both subcutaneous and a more challenging orthotopic model. Conclusions The combination of OA and EphA2-BiTE gene therapy strongly enhances the antitumor activity of OA, inducing the eradication of highly resistant tumor cells, thus supporting the clinical translation of the approach.
2021
antibodies; brain neoplasms; neoplasm; oncolytic virotherapy; pediatrics; translational medical research; adenoviridae; animals; antibodies, bispecific; apoptosis; cell line, tumor; coculture techniques; cytotoxicity, immunologic; female; gene expression regulation, neoplastic; genetic vectors; glioma; humans; lymphocyte activation; lymphocytes, tumor-infiltrating; mice, inbred nod; mice, scid; neoplasm grading; oncolytic viruses; receptor, epha2; t-lymphocytes; xenograft model antitumor assays; genetic therapy; oncolytic virotherapy
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Oncolytic adenovirus and gene therapy with epha2-bite for the treatment of pediatric high-grade gliomas / Arnone, C. M.; Polito, V. A.; Mastronuzzi, A.; Carai, A.; Diomedi, F. C.; Antonucci, L.; Petrilli, L. L.; Vinci, M.; Ferrari, F.; Salviato, E.; Scarsella, M.; De Stefanis, C.; Weber, G.; Quintarelli, C.; De Angelis, B.; Brenner, M. K.; Gottschalk, S.; Hoyos, V.; Locatelli, F.; Caruana, I.; Del Bufalo, F.. - In: JOURNAL FOR IMMUNOTHERAPY OF CANCER. - ISSN 2051-1426. - 9:5(2021), pp. 1-15. [10.1136/jitc-2020-001930]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1670161
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