Inhibition of matrix stiffness relating integrin β1 signaling pathway inhibits tumor growth in vitro and in hepatocellular cancer xenografts

Background: Cancer development is strictly correlated to composition and physical properties of the extracellular matrix. Particularly, a higher matrix stiffness has been demonstrated to promote tumor sustained growth. Our purpose was to explore the role of matrix stiffness in liver cancer development. Methods: The matrix stiffness of tumor tissues was determined by atomic force microscopy (AFM) analysis. In vitro, we used a tunable Polyacrylamide (PA) hydrogels culture system for liver cancer cells culture. The expression level of integrin beta 1, phosphorylated FAK, ERK1/2, and NF-kappa B in SMMC-7721 cells was measured by western blotting analysis. We performed MTT, colony formation and transwell assay to examine the tumorigenic and metastatic potential of SMMC-7721 cells cultured on the tunable PA hydrogels. SMMC-7721 cancer xenografts were established to explore the anticancer effects of integrin inhibitors. Results: Our study provided evidence that liver tumor tissues from metastatic patients possessed a higher matrix stiffness, when compared to the non-metastatic group. Liver cancer cells cultured on high stiffness PA hydrogels displayed enhanced tumorigenic potential and migrative properties. Mechanistically, activation of integrin beta 1/FAK/ERK1/2/NF-kappa B signaling pathway was observed in SMMC-7721 cells cultured on high stiffness PA hydrogels. Inhibition of ERK1/2, FAK, and NF-kappa B signaling suppressed the pro-tumor effects induced by matrix stiffness. Combination of chemotherapy and integrin beta 1 inhibitor suppressed the tumor growth and prolonged survival time in hepatocellular cancer xenografts. Conclusion: A higher matrix stiffness equipped tumor cells with enhanced stemness and proliferative characteristics, which was dependent on the activation of integrin beta 1/FAK/ERK1/2/NF-kappa B signaling pathway. Blockade of integrin signals efficiently improved the outcome of chemotherapy, which described an innovative approach for liver cancer treatment.

Automated summary

The study revealed that liver tumor tissues from metastatic patients had higher matrix stiffness, promoting tumor growth and metastatic potential. Culturing liver cancer cells on high stiffness matrix activated integrin signaling pathways, and inhibiting these pathways weakened the pro-tumor effects induced by matrix stiffness. Blocking integrin signals improved chemotherapy outcomes and provided an innovative approach for liver cancer treatment.