Jellyfish are among the most cancer-resistant animals on the planet, and a new mathematical and experimental study helps explain why. Researchers at the California Institute of Technology found that rapid cell division, long blamed for raising cancer risk, may in some cases work the opposite way, acting as a built-in quality-control system that weeds out abnormal cells before they can turn into tumors.
The study, published in PNAS, was led by Anish A. Sarma and John Doyle of Caltech’s Division of Engineering and Applied Sciences, along with biologist Lea Goentoro. The team built a mathematical model of cell division, death and mutation, then tested its predictions on live jellyfish.
How “high-flux proofreading” turns cell division into a defense
Normally, cell division carries risk: each split gives a cell a small chance of picking up a mutation that could eventually cause cancer. That is why fast-dividing tissues like skin, lungs and the colon develop more tumors than slow-dividing tissue such as brain neurons.
The model confirmed that pattern under most conditions, but also uncovered a second, less obvious one. When cell death is tightly linked to cell division, so more cells die each time more are made, higher division rates can end up clearing out abnormal cells rather than letting them build up.
Researchers called this process “high-flux proofreading,” since a large flow of new and dying cells can catch and remove errors even when the detection system for spotting cancerous cells is far from perfect.
To test the idea, researchers turned to the moon jellyfish, a species considered highly cancer-resistant since tumors are almost never documented in the wild. They studied young jellyfish called ephyrae, whose eight symmetrical arms make abnormal growths easy to spot.
Exposing the ephyrae to a cancer-causing chemical alone did not produce tumors. But when researchers also blocked the cells’ natural ability to self-destruct, a process called apoptosis, tumors appeared, confirming that the jellyfish rely on killing off damaged cells to stay healthy.
Blocking proliferation makes cancer-resistant jellyfish vulnerable to tumors
The team then found that jellyfish exposed to the carcinogen ramped up cell division as a protective response. When that response was blocked with stress, injury, or drugs that slow proliferation, tumors became far more common.
Restoring cell division by feeding the animals leucine, an amino acid known to boost growth, brought tumor rates back down, reinforcing the link between faster cell turnover and cancer resistance.
Researchers said the findings may help explain low cancer rates in other long-lived animals, such as elephants and naked mole rats, and could guide new strategies for detecting or preventing cancer in humans, particularly as tissue maintenance declines with age.
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