How Cancer Cells Evade Chemotherapy via “Zombie-Like State”: New Irish Research

Trinity College Dublin Researchers Discover How Tumours Evade Chemotherapy

Scientists at Trinity College Dublin have discovered that cancerous tumours evade chemotherapy by entering a zombie-like state, tricking the immune system into helping them survive. Researchers at the Smurfit Institute of Genetics found that malignant cells use Inhibitor of Apoptosis Proteins to neutralise cell-killing molecules and hijack the body’s natural wound-healing processes.

Cancer cells mimic damaged tissue to trick immune system

When exposed to chemotherapy drugs, surviving cancer cells undergo dramatic changes within days. According to findings published in the journal Science Advances, these cells stop dividing, swell up to ten times their normal size, and enter a state known as premature senescence. Tumours masquerade as damaged tissue to attract the wound-healing properties of a patient’s immune system.

Instead of destroying the malignancy, the tricked immune system supplies malignant cells with extra oxygen and nutrients. This protective response allows tumours to bounce back after treatment. The Trinity team noted that cancers function much like wounds that fail to heal, exploiting repair mechanisms for their own expansion.

Proteins block death receptors to prevent cell self-destruction

The Trinity researchers discovered that molecules called Inhibitor of Apoptosis Proteins block this process by neutralising death receptors activated by drug-induced DNA damage. Without this protection, the senescent cells would self-destruct. Instead, they linger in the body, secreting inflammatory mediators that recruit immune cells and negatively affect surrounding healthy tissue.

“Discovering how tumours can evade the cell-killing effects of chemotherapy and enter senescence is an important and challenging problem,” said Professor Seamus Martin, Smurfit professor of medical genetics at Trinity College Dublin.

Targeting Zombie Cells With IAP Antagonists

The research points toward new therapeutic strategies that could improve patient survival rates and quality of life. Because these senescent cancer cells depend heavily on Inhibitor of Apoptosis Proteins for survival, compounds known as IAP antagonists offer a way to lower tumour defences. Administering these drugs after chemotherapy blocks malignant cells from entering senescence, reactivating their internal self-destruct programmes and eliminating them.

“These new findings suggest ways in which we may be able to lower the defences of tumours by neutralising IAPs after the delivery of chemotherapeutic drugs, which should block their entry to senescence and kill more cells of the tumour,” said Martin. The project was led by Martin and Dr Gokhan Gunay, a postdoctoral research fellow, with support from the European Research Council and Research Ireland.

What are zombie-like cells and how are they eliminated?

What are zombie-like cells in cancer treatment?

Zombie-like cells are cancerous cells that stop dividing after chemotherapy exposure but refuse to die, lingering in the body and releasing inflammatory signals that harm surrounding tissues.

How do tumours trick the immune system?

Tumours mimic damaged tissue, causing the immune system to treat them as wounds requiring repair, which directs extra oxygen and nutrients to the malignant cells.

What compounds can eliminate these surviving cells?

Compounds called IAP antagonists can neutralise Inhibitor of Apoptosis Proteins, reactivating the death receptor self-destruct programme in senescent cancer cells according to the Trinity College Dublin study.

Who funded and published the research?

The research was led by Professor Seamus Martin and Dr Gokhan Gunay at Trinity College Dublin, supported by the European Research Council and Research Ireland, and published in Science Advances.

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