Scientists discover how harmful “zombie cells” hide from the immune system — SkimNews
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- Cedars-Sinai researchers identified PD-L2 as a protein enabling senescent cells to evade immune clearance, publishing the discovery in Cell Metabolism on October 14, 2026.
- In laboratory mice, blocking or removing PD-L2 reduced accumulation of senescent cells and lowered levels of inflammatory substances those cells release.
- Mice with reduced PD-L2 activity also showed improved blood sugar processing and greater grip strength, pointing to physical-function gains from clearing senescent cells.
- Human senescent cells produced more PD-L2 than younger cells, and protein levels rose with age in certain human tissues, suggesting the mouse mechanism translates to humans.
- First and co-corresponding author Selim Chaib, PhD said PD-L2 may also serve as a blood marker to detect and monitor senescent cell buildup in people.
- Senior author James Kirkland, MD, PhD said more research is needed before the approach can be considered for treating people.
Why it matters: The study names PD-L2 as the first specific protein mechanism behind senescent cell immune evasion, giving drug developers a concrete molecular handle where they previously had none. Financial disclosures show first author Chaib and several co-authors hold patents and equity at senolytic-focused firms including Rejuveron Senescence Therapeutics and Altos Labs, aligning the research direction with companies positioned to commercialize any resulting therapy.
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