Immune-Cell Atlas Links Granzyme Profiles to Future Health Risks
Published in Bioinformatics, Biology, Immunology, Journals.
October 9, 2026
WashU Medicine highlighted an Immunity study published today that maps different trajectories of immune ageing. Researchers at WashU, Nationwide Children’s Hospital and King’s College London examined approximately 12.4 million blood immune cells from 2,609 mainly healthy adults across eight cohorts.
The analysis focused on the balance between effector-memory CD8 T cells producing granzyme K and those producing granzyme B. A profile leaning toward granzyme B was associated with less favourable health trajectories, rather than simply reflecting chronological age.
To examine future outcomes, the team developed a protein-based model and applied it to baseline samples from 50,000 UK Biobank participants. Their cell profiles were inferred from blood proteins, not directly counted in that cohort. Granzyme B-dominant profiles were associated with higher subsequent mortality and several chronic diseases.
These observational associations do not prove that changing the cell ratio prevents illness or extends life. Researchers are working toward a simpler blood test; the announcement does not establish a ready-to-use routine diagnostic.
The findings provide a research framework for investigating why similarly aged people can have different immune health.