{
  "id": 3283505,
  "title": "Infrapatellar Fat Pad Extracellular Vesicles Induce a Pro-Angiogenic VEGFAhigh/BMP4low Switch in Articular Chondrocytes: Implications for Chondrosarcoma",
  "url": "https://urgent.news/2026/08/25/infrapatellar-fat-pad-extracellular-vesicles-induce-a-pro-angiogenic",
  "topic": "science",
  "section": "Science",
  "published": "2026-08-25T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.08.25.746948v1?rss=1"
  },
  "original_language": "en",
  "account": "A recent study explores the role of infrapatellar fat pad (IFP) extracellular vesicles (EVs) in promoting angiogenesis in articular chondrocytes, which may contribute to the development of chondrosarcoma. The IFP, located within the articular joint and in direct contact with cartilage, is a significant source of adipose-derived EVs. The research found that the IFP released significantly more EVs than subcutaneous fat. When primary human articular chondrocytes were exposed to IFP EVs for 24 hours, it led to an increase in VEGFA levels (+1.6-fold) and a decrease in BMP4 levels (-2.4-fold). This change in gene expression engaged the VEGF/eNOS/ERK axis, which drives chondrosarcoma angiogenesis. Further analysis of previously published data from the same donor EVs, as well as a pooled analysis of donor groups (n = 3), supported the activation of eNOS, ERK1/2, PLC-{gamma}1, and HSP27. These findings highlight the IFP as a major source of EVs within the articular joint, capable of inducing a pro-angiogenic state in articular cartilage cells, providing insights into a signaling model relevant to chondrosarcoma angiogenesis.",
  "summary": "Chondrosarcoma is a hyper-vascularised, chemoresistant cartilage malignancy driven by VEGF-centred angiogenesis, and local adipose depots are increasingly recognised as paracrine drivers of tumour angiogenesis via adipokines and extracellular vesicles (EVs). The infrapatellar fat pad (IFP), an inflammatory adipose depot within the articular joint in direct cartilage contact, is a key local source…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}