Mechanistic Study of Matrix Stiffness Promoting Lymph Node Metastasis in Cervical Cancer by Regulating NETs Formation...

Cervical cancer is a common gynecological malignancy, with a 5-year survival rate of only 17% for recurrent or metastatic cases. Increased extracellular matrix stiffness, a key change in the tumor mechanical microenvironment, promotes tumor metastasis via mechanotransduction. Piezo1, a mechanosensitive cation channel, senses matrix stiffness and converts mechanical signals into intracellular chemical signals. Neutrophil extracellular traps (NETs) are overformed in tumors, but the mechanism by which matrix stiffness regulates NETs in cervical cancer remains unclear. We detected matrix stiffness and related protein expression in cervical cancer tissues using atomic force microscopy and histochemical staining. Polyacrylamide gel models were used to culture HeLa/SiHa cells, with transcriptome sequencing and ELISA to analyze IL-8 expression. NETs were induced from human peripheral blood neutrophils, and their effect on lymphatic endothelial cells was evaluated. A TC-1 mouse model was used to verify in vivo effects, and Western blot/ELISA explored the Piezo1/NF-κB pathway. Higher Young's modulus, increased α-SMA/Collagen I expression and collagen content in metastatic cervical cancer tissues. High matrix stiffness activated Piezo1/NF-κB, upregulated IL-8, induced NETs, and enhanced lymphatic endothelial cell tube formation/migration. BAPN reduced tumor stiffness, inhibited metastasis, and decreased NETs in mice. Knocking down Piezo1 blocked NF-κB activation and IL-8 upregulation. High matrix stiffness activates Piezo1/NF-κB to promote IL-8 secretion and NETs formation, enhancing lymphangiogenesis and cervical cancer metastasis, providing a new target for advanced cervical cancer treatment.