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Adenovirus replication-competent vectors (KD1, KD3) complement the cytotoxicity and transgene expression from
Nagy A Habib1, Ragai Mitry, Prem Seth
1Department of Surgery, Faculty of Medicine, Imperial College, Hammersmith Hospital Campus, London, UK. nagy.habib@ic.ac.uk
Abstract:
The successful clinical application of adenovirus (Ad) in cancer control has been of limited success because of the current inability to infect the majority of cancer cells with a large amount of vector. In this study, we show that when human lung tumors growing in immunodeficient nude mice were coinfected with a replication-defective (RD) Ad vector expressing green fluorescent protein and a replication-competent (RC) Ad vector named KD3, KD3 enhanced the expression of green fluorescent protein throughout the tumor. Also, KD3 and another RC vector named KD1 complemented the expression of luciferase from a RD vector in a human liver tumor xenotransplant in nude mice. Altogether, these results suggest that the combination of a RD vector with a RC vector might be a more effective treatment for cancer than either vector alone due to more widespread dissemination of the virus.
Insights
Combining replication-defective and replication-competent adenovirus vectors enhances cancer treatment. This dual-vector approach improves virus dissemination and gene expression in tumors, offering a more effective cancer control strategy.
Area of Science:
- Oncolytic virotherapy
- Gene therapy delivery vectors
Background:
- Adenovirus (Ad) vectors show promise for cancer treatment but face limitations in infecting sufficient cancer cells.
- Current Ad vector strategies struggle with widespread tumor cell infection and effective gene delivery.
Purpose of the Study:
- To evaluate the efficacy of combining replication-defective (RD) and replication-competent (RC) Ad vectors for enhanced cancer treatment.
- To determine if RC Ad vectors can improve the gene expression and dissemination of RD Ad vectors in tumors.
Main Methods:
- Human lung tumors in immunodeficient mice were coinfected with RD Ad vector (GFP) and RC Ad vector (KD3).
- Human liver tumor xenografts were infected with RD Ad vector (luciferase) and complemented by RC Ad vectors (KD1, KD3).
Main Results:
- Coinfection with KD3 significantly enhanced green fluorescent protein expression throughout lung tumors.
- RC vectors KD1 and KD3 effectively complemented luciferase expression from a RD vector in liver tumor xenografts.
- The combination of RD and RC Ad vectors led to more widespread viral dissemination within tumors.
Conclusions:
- Combining RD and RC Ad vectors offers a superior strategy for cancer therapy compared to using either vector alone.
- This dual-vector approach overcomes limitations in Ad vector tumor cell infection and enhances therapeutic gene delivery.
- Widespread viral dissemination facilitated by RC vectors is key to improving Ad-based cancer control.