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Mechano-oncogenic cytoskeletal remodeling drives leukemic transformation with mitochondrial vesicle-mediated STING activation

ABSTRACT: Mitochondria are integrated within the cytoskeleton for structural integrity and functional regulation, yet the pathological exploitation of these interactions in cell fate decisions remains largely unexplored. Here, we identify a cytoskeleton-mitochondria remodeling mechanism underlying leukemic transformation by the core-binding factor subunit beta and smooth muscle myosin heavy-chain fusion (CBFβ-SMMHC). This chimera reconstructs a cytosolic filamentous cytoskeleton, inducing NMIIA phosphorylation and INF2-dependent filamentous actin (F-actin) assembly, which enhance cellular stiffness and tension, leading to calcium-mediated mitochondrial constriction, termed cytoskeletal co-option of mitochondrial constriction (CCMC). CCMC can also be triggered through diverse approaches independent of CBFβ-SMMHC, reconstructing a similar cytoskeleton and recapitulating acute myeloid leukemia (AML) with consistent immunophenotypes and inflammatory signatures. Notably, CCMC generates TOM20−PDH+mtDNA+ mitochondrial-derived vesicles that activate cGAS-STING signaling, with Sting knockout abrogating CCMC-induced leukemogenesis. Targeted inhibition of CCMC or STING suppresses AML propagation while sparing normal hematopoiesis. These findings establish CCMC as an intrinsic mechano-oncogenic process linking genetic mutations with cytoskeletal remodeling to oncogenic transformation, highlighting its promise as a therapeutic target.

ORGANISM(S): Mus musculus

PROVIDER: GSE253848 | GEO | 2025/01/01

REPOSITORIES: GEO

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Project description:Remodeling of the actin cytoskeleton through actin dynamics (assembly and disassembly of filamentous actin) is known to be essential for numerous basic biological processes. In addition, recent in vitro studies provided evidence that actin dynamics participate in the control of gene expression. A spontaneous mouse mutant, corneal disease 1 (corn1), is deficient for a regulator of actin dynamics, destrin (DSTN; also known as actin depolymerizing factor or ADF), and develops epithelial hyperproliferation and neovascularization in the cornea. Dstncorn1 mice exhibit the actin dynamics defect in the corneal epithelial cells as evidenced by increased filamentous actin, offering an in vivo model to investigate the physiological significance of the transcriptional regulation by actin dynamics. To examine the effect of the Dstncorn1 mutation on gene expression, we performed a microarray analysis using the cornea from Dstncorn1 and wild-type control mice. A dramatic alteration of gene expression was observed in the Dstncorn1 cornea, with 1,226 annotated genes differentially expressed. Functional annotation of these genes revealed that most significantly enriched functional categories are associated with actin and/or cytoskeleton. Among genes that belong to these categories, a considerable number of serum response factor (SRF) target genes were found, indicating the existence of the actin-SRF pathway of transcriptional regulation in vivo. A comparative study using an allelic mutant strain, Dstncorn1-2J, with milder corneal phenotypes also suggested that the severity of the actin dynamics defect correlates with the level of gene expression changes. Our study provides evidence that actin dynamics have a strong impact on gene expression in vivo. Experiment Overall Design: Microarray analysis was performed in triplicate with RNA from each genotype, A. BY H2bc H2-T18f/SnJ (A. BY wild-type), A. BY H2bc H2-T18f/SnJ-Dstncorn1/J (Dstncorn1), C57BL/6J (B6 wild-type), C57BL/6JSmn-Dstncorn1-2J/J (Dstncorn1-2J), and C.129S2(B6)-Il8rbtm1Mwm/J (Il8rb-/-), hybridized to three Affymetrix MG 430 2.0 arrays.

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Mechano-oncogenic cytoskeletal remodeling drives leukemic transformation with mitochondrial vesicle-mediated STING activation

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