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Published in: Cancer Immunology, Immunotherapy 5/2021

01-05-2021 | Adenovirus | Original Article

Telomerase-specific oncolytic immunotherapy for promoting efficacy of PD-1 blockade in osteosarcoma

Authors: Yusuke Mochizuki, Hiroshi Tazawa, Koji Demiya, Miho Kure, Hiroya Kondo, Tadashi Komatsubara, Kazuhisa Sugiu, Joe Hasei, Aki Yoshida, Toshiyuki Kunisada, Yasuo Urata, Shunsuke Kagawa, Toshifumi Ozaki, Toshiyoshi Fujiwara

Published in: Cancer Immunology, Immunotherapy | Issue 5/2021

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Abstract

Immune checkpoint inhibitors including anti-programmed cell death 1 (PD-1) antibody have recently improved clinical outcome in certain cancer patients; however, osteosarcoma (OS) patients are refractory to PD-1 blockade. Oncolytic virotherapy has emerged as novel immunogenic therapy to augment antitumor immune response. We developed a telomerase-specific replication-competent oncolytic adenovirus OBP-502 that induces lytic cell death via binding to integrins. In this study, we assessed the combined effect of PD-1 blockade and OBP-502 in OS cells. The expression of coxsackie and adenovirus receptor (CAR), integrins αvβ3 and αvβ5, and programmed cell death ligand 1 (PD-L1) was analyzed in two murine OS cells (K7M2, NHOS). The cytopathic activity of OBP-502 in both cells was analyzed using the XTT assay. OBP-502-induced immunogenic cell death was assessed by analyzing the level of extracellular ATP and high-mobility group box protein B1 (HMGB1). Subcutaneous tumor models for K7M2 and NHOS cells were used to evaluate the antitumor effect and number of tumor-infiltrating CD8+ cells in combination therapy. K7M2 and NHOS cells showed high expression of integrins αvβ3 and αvβ5, but not CAR. OBP-502 significantly suppressed the viability of both cells, in which PD-L1 expression and the release of ATP and HMGB1 were significantly increased. Intratumoral injection of OBP-502 significantly augmented the efficacy of PD-1 blockade on subcutaneous K2M2 and NHOS tumor models via enhancement of tumor-infiltrating CD8+  T cells. Our results suggest that telomerase-specific oncolytic virotherapy is a promising antitumor strategy to promote the efficacy of PD-1 blockade in OS.
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Metadata
Title
Telomerase-specific oncolytic immunotherapy for promoting efficacy of PD-1 blockade in osteosarcoma
Authors
Yusuke Mochizuki
Hiroshi Tazawa
Koji Demiya
Miho Kure
Hiroya Kondo
Tadashi Komatsubara
Kazuhisa Sugiu
Joe Hasei
Aki Yoshida
Toshiyuki Kunisada
Yasuo Urata
Shunsuke Kagawa
Toshifumi Ozaki
Toshiyoshi Fujiwara
Publication date
01-05-2021
Publisher
Springer Berlin Heidelberg
Published in
Cancer Immunology, Immunotherapy / Issue 5/2021
Print ISSN: 0340-7004
Electronic ISSN: 1432-0851
DOI
https://doi.org/10.1007/s00262-020-02774-7

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