Novel combinatorial therapy of oncolytic adenovirus AdV5/3-D24-ICOSL-CD40L with anti PD-1 exhibits enhanced anti-cancer efficacy through promotion of intratumoral T-cell infiltration and modulation of tumour microenvironment in mesothelioma mouse model

Front Oncol. 2023 Nov 20:13:1259314. doi: 10.3389/fonc.2023.1259314. eCollection 2023.

Abstract

Introduction: Malignant mesothelioma is a rare and aggressive form of cancer. Despite improvements in cancer treatment, there are still no curative treatment modalities for advanced stage of the malignancy. The aim of this study was to evaluate the anti-tumor efficacy of a novel combinatorial therapy combining AdV5/3-D24-ICOSL-CD40L, an oncolytic vector, with an anti-PD-1 monoclonal antibody.

Methods: The efficacy of the vector was confirmed in vitro in three mesothelioma cell lines - H226, Mero-82, and MSTO-211H, and subsequently the antineoplastic properties in combination with anti-PD-1 was evaluated in xenograft H226 mesothelioma BALB/c and humanized NSG mouse models.

Results and discussion: Anticancer efficacy was attributed to reduced tumour volume and increased infiltration of tumour infiltrating lymphocytes, including activated cytotoxic T-cells (GrB+CD8+). Additionally, a correlation between tumour volume and activated CD8+ tumour infiltrating lymphocytes was observed. These findings were confirmed by transcriptomic analysis carried out on resected human tumour tissue, which also revealed upregulation of CD83 and CRTAM, as well as several chemokines (CXCL3, CXCL9, CXCL11) in the tumour microenvironment. Furthermore, according to observations, the combinatorial therapy had the strongest effect on reducing mesothelin and MUC16 levels. Gene set enrichment analysis suggested that the combinatorial therapy induced changes to the expression of genes belonging to the "adaptive immune response" gene ontology category. Combinatorial therapy with oncolytic adenovirus with checkpoint inhibitors may improve anticancer efficacy and survival by targeted cancer cell destruction and triggering of immunogenic cell death. Obtained results support further assessment of the AdV5/3-D24-ICOSL-CD40L in combination with checkpoint inhibitors as a novel therapeutic perspective for mesothelioma treatment.

Keywords: CD40L; ICOSL; TILs; anti PD-1; immune checkpoint inhibitors; immunotherapy; mesothelioma; oncolytic adenovirus.

Grants and funding

The author(s) declare financial support was received for the research, authorship, and/or publication of this article. LK was supported by the National Science Centre, Poland, SONATA (2022/47/D/NZ7/03212), SONATINA (2019/32/C/NZ7/00156), and the National Institute of Public Health NIH – National Research Institute, Poland (BW-3/2023, 1BWBW/2022). M.G. acknowledges STARS Starting Grant (STARS StG) (Grant Number: GARO_STARS_MUR22_01) funded by the University of Padua. This publication is based on work in COST Action CA 17140 “Cancer Nanomedicine from the Bench to the Bedside” supported by COST (European Cooperation in Science and Technology) (LK, MG). MS was supported by the Centre for Advanced Materials and Technologies, WUT, Poland and grant POB BioTechMed-1 No. 504/04496/1020/45.010406 and BIOTECHMED-LAB-1 (Excellence Initiative Research University). ML was partially supported by IDUB against COVID-19 project granted by Warsaw University of Technology under the Excellence Initiative Program: Research University (IDUB). DP research was funded by Warsaw University of Technology under the Excellence Initiative Program: Research University (IDUB) and co-supported by Polish National Science Centre (2019/35/O/ST6/02484 and 2020/37/B/NZ2/03757). Computations were performed using the Artificial Intelligence HPC platform financed by the Polish Ministry of Science and Higher Education (Decision No. 7054/IA/SP/2020 of 2020-08-28). TS research was co-funded by (POB Biotechnology and Biomedical Engineering) of Warsaw University of Technology within the Excellence Initiative Program: Research University (IDUB).