Stiffness-activated hepatic stellate cells boost HCC migration via TGM2/ITGB1-mediated matrix remodeling and mitochondrial transfer

Early human evidence such as case series or small samples is exploring possible benefits.

• Level A · Stronger Clinical Evidence
• Level B · Emerging clinical evidence with positive signals
• Level C · Early human research exploring benefits
• Level D · Scientific groundwork from lab and animal studies
• Emerging · Emerging topic under active research

Abstract (original English)

Background & aims High liver stiffness correlates with poor outcomes in hepatocellular carcinoma (HCC). Prior studies focused on neoplastic cells rather than the tumor microenvironment. This study investigated how the tumor microenvironment, particularly mechanosignaling in hepatic stellate cells (HSCs), drives HCC progression. Methods The study examined the roles of transglutaminase 2 (TGM2) and integrin β1 (ITGB1) in HSCs under mechanical stress through proteomics, cell contraction assays, and protein interactions. It also analyzed gene expression data from 178 patients with HCC and cirrhosis to assess the impact of TGM2 and ITGB1 on overall survival (OS). Mitochondrial transfer and cell migration were observed using confocal microscopy, and the effect of TGM2/ITGB1 on extracellular matrix (ECM) remodeling and HCC recurrence was studied in a rat liver cancer model. Results We showed that HSC activation under matrix stiffness relied on ITGB1 mechanosignaling, with high cell-surface TGM2 expression required for ITGB1 activation. This process activated downstream CAV1, which in turn stabilized ITGB1 expression. Moreover, high co-expression of TGM2/ITGB1 (R = 0.77, p -16 ) was negatively correlated with OS. Interestingly, we found massive mitochondrial transfer in hybrid co-cultures between cancer-associated fibroblasts (CAFs) and Huh7 cells by tunneling nanotubes under high stif

Evidence level

Early human evidence such as case series or small samples is exploring possible benefits.

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