Immune recruitment and therapeutic synergy: keys to optimizing oncolytic viral therapy?

Jay D Naik1, Christopher J Twelves, Peter J Selby

  • 1Leeds Institute of Molecular Medicine, University of Leeds, Leeds, UK. j.d.naik@leeds.ac.uk

Insights

Oncolytic viruses show promise in cancer treatment but require understanding complex interactions. Harnessing the immune system and combining with chemotherapy can enhance antitumor efficacy.

Area of Science:

  • Virology
  • Immunology
  • Oncology

Background:

  • Oncolytic viruses (OVs) are DNA and RNA viruses that replicate in and kill tumor cells.
  • Clinical trials show OVs have progressed, but their efficacy has not met preclinical expectations.
  • Direct tumor cell killing (oncolysis) may not be the sole mechanism of OV efficacy.

Purpose of the Study:

  • To explore clinical and preclinical data on oncolytic viruses.
  • To highlight progress, uncertainties, and translational opportunities in OV therapy.
  • To emphasize the role of immune system interaction and therapeutic synergy.

Main Methods:

  • Review of clinical and preclinical data on oncolytic viruses.
  • Analysis of the complex interactions between OVs, tumors, chemotherapy, and the immune system.
  • Exploration of immune recruitment and therapeutic synergy.

Main Results:

  • The host immune system can be an ally, generating antitumor immunity when interacting with OVs.
  • Oncolytic viruses demonstrate synergy with standard therapies, potentially improving clinical response rates.
  • Direct oncolysis is not the only factor contributing to OV-mediated antitumor effects.

Conclusions:

  • Understanding the interplay between OVs, the immune system, and chemotherapy is crucial for maximizing OV therapeutic potential.
  • Leveraging immune responses and therapeutic synergy offers significant translational opportunities for OV therapy.
  • Further research is needed to fully realize the clinical promise of oncolytic viruses.

Related Concept Videos

Tumor Immunotherapy01:27

Tumor Immunotherapy

Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
Inhibitors of Viral Protein Synthesis01:30

Inhibitors of Viral Protein Synthesis

Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
Cancer Therapies02:49

Cancer Therapies

Cancer therapies are various modes of treatment, such as surgery, radiation therapy, and chemotherapy that are administered to cancer patients.
However, cancer treatments can pose several challenges, as therapies used to kill cancer cells are generally also toxic to normal cells. Moreover, cancer cells mutate rapidly and can develop resistance to chemical agents or radiation therapy. Besides, all types of cancer cells may not respond to the same therapy. Some cancer cells respond to one...
Cytotoxic T Cells-mediated Immune Response01:27

Cytotoxic T Cells-mediated Immune Response

Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
Microorganisms in Medicine and Therapeutics01:29

Microorganisms in Medicine and Therapeutics

Microorganisms play a fundamental role in vaccine development, gene therapy, and therapeutic production. Their biological properties are harnessed to advance medicine and public health. Beyond immunization, microorganisms contribute to gut health, antibiotic synthesis, and genetic disease treatment.Live Attenuated and Inactivated VaccinesLive attenuated vaccines, such as the measles, mumps, and rubella (MMR) vaccine, utilize weakened forms of pathogens to closely resemble natural infections.
Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...