Effect of NF- κ B inhibitor PDTC on VEGF and endostatin expression of mice with Lewis lung cancer.

Objective: To investigate the effects of NF- κ B inhibitor pyrrolidine dithiocarbamate hydrochloride (PDTC) on vascular endothelial growth factor (VEGF) and endostatin expression in mice with Lewis lung cance; and its mechanism.

Methods: Mice survival rate and anti-tumor effects were observed in different concentrations of NF- κ B inhibitor PDTC after the Lewis lung cancer mice model was established. VEGF and endostatin expressions were detected by immunohistochemical assay.

Results: Lewis lung cancer was be inhibited by 0.5 mg/kg, 1.5 mg/kg and 3.0 mg/kg of NF- κ B inhibitor PDTC (P<0.05). Microvessel density (MVD) in 0.5 mg/kg, 1.5 mg/kg and 3.0 mg/kg NF- κ B inhibitor PDTC groups were significantly lower than the control group (P<0.05). Immunohistochemical assay results showed that VEGF and endostatin expressions in the 0.5 mg/kg, 1.5 mg/kg and 3.0 mg/kg NF-κ B inhibitor PDTC groups were significantly lower than the control group (P<0.05). Western blot results also showed that NF- κ B inhibitor PDTC could inhibit VEGF and endostatin expressions in tumor tissues.

Conclusions: NF- κ B inhibitor PDTC can inhibit tumor formation and reduce tumor angiogenesis in mice with Lewis lung cancer; and its mechanism maybe associated to VEGF and endostatin down-regulation.