Remembering Stiffness: HCC Maintains Malignancy through Heritable Hyperacetylation Driven by Mechanically Mediated Acetyl-CoA Levels

Hepatocellular carcinoma (HCC) typically arises within fibrotic, mechanically rigid microenvironments where matrix stiffness directly drives primary tumor proliferation and invasion. However, whether and how tumor cells retain these mechanical adaptations upon disseminating to softer metastatic sites has remained unclear. In this issue of Cancer Research, Luo and colleagues demonstrate that HCC cells retain a "mechanical memory" of matrix stiffness that persists even after metastasizing to soft secondary niches, such as the lungs. Mechanistically, this memory is mediated by contractility-dependent suppression of mitochondrial fission. The resulting accumulation of acetyl-CoA fuels sustained histone hyperacetylation, preserving a proliferative state across subsequent cell generations. These findings uncover a novel mechano-metabolic-epigenetic axis that sustains HCC proliferation during metastatic dissemination. See related article by Luo et al., p. 5354.