{
  "id": 10428562,
  "title": "BLTP3A dysfunction unleashes lysosomal stress-induced antitumor immunity through STING",
  "url": "https://urgent.news/2026/09/28/bltp3a-dysfunction-unleashes-lysosomal-stress-induced-antitumor",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-28T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.25.752224v1?rss=1"
  },
  "original_language": "en",
  "account": "High-grade serous ovarian cancer thrives in an environment rich in lipids, characterized by stress-adaptation programs that foster malignant growth. However, the role of stress resolution in tumor progression remains unclear. In this study, researchers discovered that unresolved lysosomal stress impedes tumor growth by maintaining STING activity within tumor cells and reshaping antitumor immunity. They identified BLTP3A as a crucial lysosomal stress-resolution factor in ovarian cancer. Individuals possessing the common germline missense variant, BLTP3A M1098T, exhibited longer overall survival and tumors with a higher concentration of cytotoxic T cells and myeloid neighbors. When Bltp3a was lost or expressed as an orthologous variant in syngeneic tumors, progression was delayed, leading to the formation of Cxcl9+ antigen-presenting macrophage niches. Human tumors carrying the M1098T variant also promoted interferon-responsive myeloid and T-cell enrichment in humanized mice. The underlying mechanism involves an STING-ATF4-BLTP3A feedback loop. Dysfunctional BLTP3A disrupted CASM-associated lysosomal stress resolution, resulting in persistent STING activity and continuous tumor-derived interferon-lambda secretion without elevated cGAMP levels. The tumor cells' STING and interferon-lambda were essential for immune remodeling and tumor control. Therefore, BLTP3A-dependent lysosomal stress resolution curtails the persistence of stress-induced STING signaling, while its failure sustains a tumor-specific inflammatory program that cultivates protective antitumor immunity.",
  "summary": "High-grade serous ovarian cancer progresses within a lipid-rich ascites microenvironment that engages stress-adaptation programs supporting malignant growth, yet how failed stress resolution influences tumor progression remains incompletely defined. Here, we show that unresolved lysosomal stress restrains tumor progression by sustaining tumor cell-intrinsic STING activity and reorganizing…",
  "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."
}