Work

ALKBH5 demethylation modification of SE-lncRNA ZMIZ1-AS1 promotes FGFR1-mediated proliferation and invasive metastasis in osteosarcoma

Year: 2025

Type: article

Abstract: Osteosarcoma is the most prevalent primary malignant bone tumor in children and adolescents. However, its underlying pathogenesis and mechanisms driving metastasis remain poorly understood. Here, we identified a novel super-enhancer-associated long noncoding RNA (SE-lncRNA), Zinc Finger MIZ-Type Containing 1 Antisense RNA 1 (ZMIZ1-AS1), which is highly expressed in osteosarcoma and promoted tumor cell proliferation, migration, and invasion. Mechanistically, the m⁶A demethylase ALKBH5 post-transcriptionally stabilized ZMIZ1-AS1 through m⁶A demethylation. Furthermore, ZMIZ1-AS1 directly bound to the RNA-binding protein Polypyrimidine Tract Binding Protein 1 (PTBP1), facilitating the translocation of PTBP1 from the nucleus to the cytoplasm. The relocalized PTBP1 then bound to and stabilized fibroblast growth factor receptor 1 (FGFR1) mRNA. In nude mouse models, ZMIZ1-AS1 overexpression promoted tumor growth and lung metastasis. Notably, combined inhibition of ALKBH5 (using ALKBH5-IN-5) and FGFR1 (using BGJ398/infigratinib) synergistically suppressed ZMIZ1-AS1-driven oncogenesis in vivo. Our study establishes the ALKBH5/ZMIZ1-AS1/PTBP1/FGFR1 signaling axis as a key driver of osteosarcoma progression and a promising target for therapeutic intervention.

Source: Cellular and Molecular Life Sciences

DOI: 10.1007/s00018-025-05969-2