Activation hypoxia inducible factor-1α gene affected the tumor microenvironment and induced recurrence and invasion of bladder cancer in vitro.

Objective: This work aimed to investigate the molecular mechanism of the activation of hypoxia-inducible factors under different low oxygen partial pressures.

Methods: Strictly follow in vitro aseptic culture of bladder cancer cell line UMUC3 and when the cells grow in the logarithmic phase, culture the cells under different low oxygen partial pressures. Among these groups, two groups of cells were transfected with small interfering-hypoxia inducible factor 1α (si-HIF-1α) liposome plasmids to silencing the HIF-1α expression.

Results: Cell cloning experiment showed that HIF-1α will increase cell adhesion and proliferation under hypoxia. Matrigel angiogenesis experiment showed that hypoxia has a negative impact on the angiogenesis of tumor cells. Cell scratch test indicated that hypoxia has a greater impact on the migration ability of cancer cells, and HIF-1α has a significant impact on the migration process. Cell invasion test proved that hypoxia has a greater impact on the invasion ability of cancer cells, and HIF-1α has a great impact on the invasion process.

Conclusion: HIF-1α can target the regulatory gene vascular endothelial growth factor to promote tumor cell proliferation, migration, invasion, neovascularization and lymph node metastasis.