{
  "id": 14635302,
  "title": "Can we take the STING out of bone loss? Pathway presents potential treatment target for skeletal aging",
  "url": "https://urgent.news/2026/10/15/can-we-take-the-sting-out-of-bone-loss-pathway-presents-potential",
  "topic": "science",
  "section": "Science",
  "published": "2026-10-15T07:10:01.000Z",
  "source": {
    "name": "Medical Xpress",
    "slug": "medical-xpress",
    "url": "https://medicalxpress.com/news/2026-10-bone-loss-pathway-potential-treatment.html"
  },
  "original_language": "en",
  "account": "Osteoporosis, a condition characterized by weak and brittle bones, is a common consequence of aging. This bone deterioration is attributed to alterations in cells within the bone marrow microenvironment, including heightened fat cells and pro-inflammatory immune cells. The STING signaling pathway, a molecular trigger of inflammation, has been identified as a factor in aging bones, but its role remained unknown until recently.\n\nIn a recent study published in Advanced Science, researchers discovered that the STING pathway is activated in bone marrow macrophages as part of the aging process. Macrophages are immune cells that can contribute to inflammation, a characteristic of skeletal aging. The study involved mice genetically engineered to lack the STING protein in bone marrow cells. Despite exhibiting reduced bone density during their youth, these mice were protected against bone loss as they grew older.\n\nThe researchers then investigated the role of bone marrow fat cells, termed bone marrow adipocytes, in the STING pathway activation. When these fat cells were cultured with young bone marrow cells, they triggered STING activation. As bone marrow fat cells age, they undergo senescence, a state where they cease dividing and functioning correctly. Senescent fat cells secrete harmful factors that activate the STING pathway, leading to inflammation and bone loss.\n\nFurther analysis revealed that a protein called DPP4, secreted by senescent fat cells, activated the STING pathway, induced inflammation, and contributed to bone loss. Downstream of STING activation, the researchers found that NAD⁺, an essential molecule involved in various cellular processes, was depleted in the surrounding bone marrow cells. This NAD⁺ depletion impaired the differentiation of bone marrow stem cells, which are crucial for bone formation and repair, thus contributing to skeletal aging.\n\nThe study elucidates how the STING pathway in bone marrow macrophages functions as a central integration hub, connecting various cell types involved in skeletal aging. Consequently, these findings suggest that targeting the STING signaling pathway in bone marrow macrophages could offer a comprehensive approach to managing the complex bone marrow microenvironment during aging.",
  "summary": "As we age, our bones become weak and brittle, a process called osteoporosis. This bone loss is caused by changes in the cells within the bone marrow microenvironment, such as elevated fat and inflammation-promoting immune cells. One molecular driver of inflammation is the STING signaling pathway, though the role of this pathway in aging bones has until now been unclear.",
  "key_points": [
    "STING signaling pathway activates inflammation in aging bones",
    "Mice without STING protein protected against bone loss in old age",
    "DPP4 protein from senescent fat cells triggers STING activation"
  ],
  "editors_take": "Targeting the STING signaling pathway offers a way to manage the complex bone marrow microenvironment by preventing the inflammation and stem cell depletion that drive age-related skeletal deterioration.",
  "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."
}