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  "path": "/articles/d41586-026-01531-7",
  "publishedAt": "2026-05-15T00:04:03.485Z",
  "site": "https://www.nature.com",
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  "textContent": "Nature, Published online: 14 May 2026; doi:10.1038/d41586-026-01531-7\n\nOld T cells secrete an enzyme that can impair brain function in mice.",
  "title": "Immune cells in the blood drive cognitive ageing — blocking them improves memory",
  "updatedAt": "2026-05-14T00:00:00.000Z"
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