{
  "id": 146577,
  "title": "Signaling pathway may explain how transition from milk to solid food shapes immune system development",
  "url": "https://urgent.news/2026/08/04/signaling-pathway-may-explain-how-transition-from-milk-to-solid-food",
  "topic": "science",
  "section": "Science",
  "published": "2026-08-04T20:40:03.000Z",
  "source": {
    "name": "Medical Xpress",
    "slug": "medical-xpress",
    "url": "https://medicalxpress.com/news/2026-08-pathway-transition-solid-food-immune.html"
  },
  "original_language": "en",
  "account": "The transition from breastfeeding to solid food plays a critical role in shaping the immune system during early life. Dendritic cells, specialized immune cells that process material from the environment, are key to this process. When young mice begin eating solid, grain-based food, certain lymphocytes ramp up the production of interferon-gamma. This molecule triggers a signaling cascade that activates a specific type of dendritic cell known as cDC1, which in turn produces a signaling molecule called CXCL9. These cDC1 cells influence the properties and activity of CD8 T cells, which recognize food-derived substances.\n\nThis regulatory circuit was observed in germ-free mice as well, indicating that it does not rely on the changes in gut microbiota that accompany weaning. However, the specific dietary components that influence the immune response have yet to be identified, though they are likely bioactive substances found in grain feed, such as beta-glucans, or traces of molecules derived from microbes like lipopolysaccharides.\n\nInterestingly, these cDC1 cells remained responsive to dietary changes even in adult mice. This suggests that diet may be a modifiable environmental stimulus capable of influencing immunity both during early life and later in adulthood. The study's findings reveal that food provides the immune system with more than just nutrients; it also delivers crucial information. Schraml notes that the discovery that cDC1 remain responsive to dietary changes in adults opens up the potential for investigating whether immune responses can be influenced by targeted dietary interventions in the future.",
  "summary": "The early period of life is a critical phase in which the immune system must learn to tolerate harmless environmental stimuli, such as food and microbes that normally live in and on the body, while remaining vigilant against harmful substances and pathogens. If it fails to strike the right balance, the individual may become more susceptible later in life to allergies and autoimmune diseases.…",
  "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."
}