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  "path": "/news/2026-06-hidden-mechanism-joint-tissue-growth.html",
  "publishedAt": "2026-06-24T15:20:01.000Z",
  "site": "https://medicalxpress.com",
  "textContent": "Researchers at Hospital for Special Surgery (HSS) have identified a specialized population of immune cells that plays a central role in driving abnormal tissue growth in rheumatoid arthritis (RA), offering new insight into disease progression and potential treatment strategies. The study, published in Science Translational Medicine, reveals that a subset of immune cells known as SPP1ʰⁱ macrophages works in tandem with structural cells and protein scaffolds to promote excessive tissue expansion in the joints of patients with RA.",
  "title": "Hidden mechanism driving joint tissue growth in rheumatoid arthritis has been found"
}