Two mitochondrial signals fuel 'zombie' cell inflammation — SkimNews
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- Senescent 'zombie' cells sustain chronic aging inflammation through the senescence-associated secretory phenotype (SASP), remaining metabolically active even though they have stopped dividing.
- Two mitochondrial pathways converge to drive SASP: elevated acetyl-CoA loosens DNA packaging around inflammatory genes, while leaked mitochondrial DNA and RNA trigger immune signals that activate those exposed genes.
- The drug CTPI-2, which blocks a transport protein needed to produce acetyl-CoA, reduced inflammation across multiple tissues and improved healthspan in aging mice — even though the immune-triggering mitochondrial DNA leaks remained active.
- Peter Adams of Sanford Burnham Prebys and João Passos of Mayo Clinic co-led the work, with first author Hélène Martini; collaborators included researchers from Imperial College London, Albert Einstein College of Medicine, and the University of Glasgow.
- Funding came from the NIH, National Institute on Aging, Hevolution Foundation, Glenn Foundation, Cancer Research UK, and others, with results published in Nature in September 2026.
Why it matters: Pinpointing acetyl-CoA production as a druggable checkpoint for senescent-cell inflammation gives researchers a concrete molecular target — demonstrated by CTPI-2's multi-tissue anti-inflammatory effects and improved healthspan in mice — for an aging-driven disease mechanism that currently has no targeted therapies.
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