ArticleThe Journal of clinical investigation2025
PIM3-mediated phosphorylation stabilizes myeloid leukemia factor 2 to promote metastasis in osteosarcoma.
Article in The Journal of clinical investigation, 2025. 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
Osteosarcoma is the most common primary malignant bone cancer, characterized by a high incidence of lung metastasis and a lack of therapeutic targets. Here, by combining an in vivo CRISPR activation screen with the interactome of STUB1, a tumor suppressor in osteosarcoma, we identified that myeloid leukemia factor 2 (MLF2) promotes osteosarcoma metastasis. Mechanistically, MLF2 disrupted the interaction between BiP and IRE1α, thereby activating the IRE1α/XBP1-S-MMP9 axis. The E3 ligase STUB1 ubiquitinated MLF2 at Lys119 and targeted it for proteasomal degradation, whereas PIM3-mediated phosphorylation of MLF2 at Ser65 enhanced its stabilizing interaction with USP21. Our findings demonstrate that the PIM3/MLF2 axis is a critical regulator of osteosarcoma lung metastasis. We propose PIM3 as a potential therapeutic target for patients with osteosarcoma lung metastasis.
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