{
  "id": 10786130,
  "title": "Tiny blood clots help guide blood flow as placenta develops, mouse study finds",
  "url": "https://urgent.news/2026/09/29/tiny-blood-clots-help-guide-blood-flow-as-placenta-develops-mouse",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-29T21:40:07.000Z",
  "source": {
    "name": "Medical Xpress",
    "slug": "medical-xpress",
    "url": "https://medicalxpress.com/news/2026-09-tiny-blood-clots-placenta-mouse.html"
  },
  "original_language": "en",
  "account": "A recent mouse study has revealed that tiny blood clots, known as placental microthrombi, play a crucial role in guiding blood flow as the placenta develops during pregnancy. This finding, published in the Journal of Clinical Investigation, challenges the previously held belief that these clots were primarily responsible for pregnancy complications. Dr. Markus Abeln, who led the research at Hannover Medical School, explains that these microthrombi act like temporary dams, restricting maternal blood flow at specific points to ensure proper development of the placenta. The microthrombi contain maternal platelets and clotting proteins, as well as the complement protein C3, which is part of the body's innate immune system. The scientists discovered that the formation of these microthrombi involves a delicate balance between platelets, clotting factors, and the complement system. They found that a specific sugar molecule (sialic acid) on the placental surface is essential for normal microthrombus formation. When this molecule is missing, excessive activation of the complement system, extensive platelet deposits, and clotting factor accumulation occur, leading to severe placental development issues. The study highlights the importance of a fine-tuned interaction between these components for a successful pregnancy, with dysregulation potentially contributing to various pregnancy complications in humans, such as preeclampsia, recurrent miscarriages, and autoimmune-related adverse outcomes. Further research is needed to translate these findings to human placental tissue and models.",
  "summary": "During pregnancy, the human embryo is initially supplied with nutrients through the yolk sac; later, the placenta takes over this role. It consists of maternal and embryonic tissue, through whose blood vessels the mother's blood flows. An interdisciplinary research team at Hannover Medical School (MHH) has demonstrated in a mouse model that tiny, localized blood clots at the interface between…",
  "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."
}