ArticleInternational journal of molecular sciences2026
A CAF-Associated Stromal Remodeling Signature Links Immune Exclusion to Exhaustion-Prone CD8
Article in International journal of molecular sciences, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
High-grade serous ovarian carcinoma (HGSOC) shows limited benefit from immune checkpoint blockade, partly because stromal barriers impair antitumor immunity. We developed a cancer-associated fibroblast (CAF)-associated mitochondrial metabolic and matrix-remodeling signature, termed CMMS, to characterize this immune-suppressive stromal state. CMMS integrated contractile/myCAF, extracellular matrix (ECM), and mitochondrial metabolic genes. Its clinical, metabolic, and immune relevance was evaluated in TCGA-HGSOC, independent GEO cohorts, single-cell RNA-seq datasets, and an anti-PD-L1-treated cohort, followed by cell-cell communication and experimental validation. LASSO-weighted CMMS stratified overall survival, with high CMMS indicating poorer prognosis. CMMS-high tumors exhibited ECM/TGFβ activation; associations with COL1A1, POSTN, and LOX; and a hypoxia-dominant metabolic phenotype. Mediation analysis suggested that hypoxia largely linked CMMS to glycolytic remodeling. Immune profiling revealed stromal-rich immune exclusion, checkpoint activation, and exhaustion-prone T-cell dysfunction. Single-cell analysis localized CMMS mainly to myCAF-like ECM-remodeling CAFs. In validation datasets, CMMS-high CAFs were associated with reduced CD8 abundance, increased CD8 exhaustion, and stronger matrix- and chemokine-related communication with T cells. Experiments further supported a link between TGFβ-related fibroblast activation, ECM-remodeling features, and impaired CD8
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