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Delwar Z, Tatsiy O, Chouljenko DV, Lee IF, Liu G, Liu X, Bu L, Ding J, Singh M, Murad YM, Jia WWG. Prophylactic Vaccination and Intratumoral Boost with HER2-Expressing Oncolytic Herpes Simplex Virus Induces Robust and Persistent Immune Response against HER2-Positive Tumor Cells. Vaccines (Basel) 2023; 11:1805. [PMID: 38140209 PMCID: PMC10747554 DOI: 10.3390/vaccines11121805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 11/11/2023] [Accepted: 11/28/2023] [Indexed: 12/24/2023] Open
Abstract
The development of effective cancer vaccines remains a significant challenge due to immune tolerance and limited clinical benefits. Oncolytic herpes simplex virus type 1 (oHSV-1) has shown promise as a cancer therapy, but efficacy is often limited in advanced cancers. In this study, we constructed and characterized a novel oHSV-1 virus (VG22401) expressing the human epidermal growth factor receptor 2 (HER2), a transmembrane glycoprotein overexpressed in many carcinomas. VG22401 exhibited efficient replication and HER2 payload expression in both human and mouse colorectal cancer cells. Mice immunized with VG22401 showed significant binding of serum anti-HER2 antibodies to HER2-expressing tumor cells, inducing antibody-dependent cell-mediated cytotoxicity (ADCC) and complement-dependent cytotoxicity (CDC). Furthermore, mice primed with VG22401 and intratumorally boosted with the same virus showed enhanced antitumor efficacy in a bilateral syngeneic HER2(+) tumor model, compared to HER2-null backbone virus. This effect was accompanied by the induction of anti-HER2 T cell responses. Our findings suggest that peripheral priming with HER2-expressing oHSV-1 followed by an intratumoral boost with the same virus can significantly enhance antitumor immunity and efficacy, presenting a promising strategy for cancer immunotherapy.
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Chouljenko DV, Murad YM, Lee IF, Delwar Z, Ding J, Liu G, Liu X, Bu X, Sun Y, Samudio I, Jia WWG. Targeting carcinoembryonic antigen-expressing tumors using a novel transcriptional and translational dual-regulated oncolytic herpes simplex virus type 1. Mol Ther Oncolytics 2023; 28:334-348. [PMID: 36938544 PMCID: PMC10018392 DOI: 10.1016/j.omto.2023.02.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 02/07/2023] [Indexed: 02/12/2023] Open
Abstract
VG2025 is a recombinant oncolytic herpes simplex virus type 1 (HSV-1) that uses transcriptional and translational dual regulation (TTDR) of critical viral genes to enhance virus safety and promote tumor-specific virus replication without reducing virulence. The TTDR platform is based on transcriptional control of the essential HSV-1 immediate-early protein ICP27 using a tumor-specific carcinoembryonic antigen (CEA) promoter, coupled with translational control of the neurovirulence factor ICP34.5 using multiple microRNA (miR)-binding sites. VG2025 further incorporates IL-12 and the IL-15/IL-15 receptor alpha subunit complex to enhance the antitumor and immune stimulatory properties of oncolytic HSVs. The TTDR strategy was verified in vitro and shown to be highly selective. Strong in vivo antitumor efficacy was observed following both intratumoral and intravenous administration. Clear abscopal and immune memory effects were also evident, indicating a robust antitumor immune response. Gene expression profiling of treated tumors revealed increased immune cell infiltration and activation of multiple immune-signaling pathways when compared with the backbone virus. Absence of neurotoxicity was verified in mice and in rhesus monkeys. Taken together, the enhanced tumor clearance, excellent safety profile, and positive correlation between CEA levels and viral replication efficiency may provide an opportunity for using biomarker-based precision medicine in oncolytic virotherapy.
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Affiliation(s)
- Dmitry V. Chouljenko
- Virogin Biotech Canada Ltd., 150-13511 Commerce Parkway, Richmond, BC V6V 2J8, Canada
- Corresponding author: Dmitry V. Chouljenko, Virogin Biotech Canada Ltd., 150-13511 Commerce Parkway, Richmond, BC V6V 2J8, Canada.
| | - Yanal M. Murad
- Virogin Biotech Canada Ltd., 150-13511 Commerce Parkway, Richmond, BC V6V 2J8, Canada
| | - I-Fang Lee
- Virogin Biotech Canada Ltd., 150-13511 Commerce Parkway, Richmond, BC V6V 2J8, Canada
| | - Zahid Delwar
- Virogin Biotech Canada Ltd., 150-13511 Commerce Parkway, Richmond, BC V6V 2J8, Canada
| | - Jun Ding
- Virogin Biotech Canada Ltd., 150-13511 Commerce Parkway, Richmond, BC V6V 2J8, Canada
| | - Guoyu Liu
- Virogin Biotech Canada Ltd., 150-13511 Commerce Parkway, Richmond, BC V6V 2J8, Canada
| | - Xiaohu Liu
- Virogin Biotech Canada Ltd., 150-13511 Commerce Parkway, Richmond, BC V6V 2J8, Canada
| | - Xuexian Bu
- Virogin Biotech Canada Ltd., 150-13511 Commerce Parkway, Richmond, BC V6V 2J8, Canada
| | - Yi Sun
- Virogin Biotech Canada Ltd., 150-13511 Commerce Parkway, Richmond, BC V6V 2J8, Canada
| | - Ismael Samudio
- Virogin Biotech Canada Ltd., 150-13511 Commerce Parkway, Richmond, BC V6V 2J8, Canada
| | - William Wei-Guo Jia
- Virogin Biotech Canada Ltd., 150-13511 Commerce Parkway, Richmond, BC V6V 2J8, Canada
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