Scientists at La Trobe University found a new way that cells die and send signals to the body. This could help doctors create better medicines that support the immune system.
The work was published in Nature Communications. It shows that the final steps of a dying cell are not messy but follow a clear plan.
PhD student Stephanie Rutter led the study in Professor Ivan Poon’s lab at the La Trobe Institute for Molecular Science. They learned that cell death is much more organized than we thought.
New Tiny Packages From Dying Cells
When a cell reaches the end of its life, it changes shape, pulls away from its neighbors, and leaves a tiny residue. The researchers call this residue the "footprint of death."
Inside the residue they found a brand‑new type of extracellular vesicle (EV). EVs are tiny bubbles that carry proteins, fats, DNA and RNA between cells.
The new vesicles, named F‑ApoEVs, stay where the cell died. They act like breadcrumbs, guiding immune cells to clean up the leftover bits and stop inflammation.
How Viruses Use the Cleanup Trail
In lab tests with flu‑infected cells, the team saw that viruses can hide inside F‑ApoEVs. This lets the virus travel to nearby cells while staying hidden inside the body’s normal trash‑removal system.
Professor Poon, director of the Research Centre for Extracellular Vesicles, said the discovery could help create new treatments that boost the immune system’s ability to fight disease.
He explained that billions of cells die every day, and we used to think the breakup of these cells was random. Their findings show each step is carefully controlled and essential for proper clean‑up.
Talking After Death
Stephanie Rutter highlighted that cells keep communicating even after they die. This communication helps prevent inflammation and autoimmune problems like lupus.
She was surprised to see viruses hijack this system, using the vesicles as secret hide‑outs.
Understanding this process could improve how we treat infections and autoimmune diseases.
What This Means for Immune Health
Co‑leader Dr. Georgia Atkin‑Smith from WEHI noted that dying cells can still send signals that affect immune function. This knowledge is important for many illnesses.
The research involved scientists from La Trobe’s RCEV, LIMS, the School of Agriculture, Biomedicine and Environment, as well as partners at WEHI and Toronto Metropolitan University.