29110

TBK1

TANK-binding kinase 1;TBK1;TANK-binding kinase 1

NF-kB-activating kinase|NF-kappa-B-activating kinase|serine/threonine-protein kinase TBK1

12q14.1

protein-coding

BACKGROUND: Lymph node involvement and tumor-induced lymphangiogenesis appear as the earliest features of esophageal squamous cell carcinoma (ESCC), although the molecular regulatory mechanisms involved have remained unclear. Our aim was to investigate the contribution of NF-kappaB and Notch1 signaling to lymph node involvement and tumor-induced lymphangiogenesis in ESCC. MATERIAL AND METHODS: NF-kappaB and Notch1 expression in 60 tissue samples of ESCC were assessed by immunohistochemical staining. The correlations of NF-kappaB and Notch1 with lymph node involvement, lymphatic vessel density (LVD), podoplanin, and vascular endothelial growth factor-C (VEGF-C) were further evaluated to determine the association of NF-kappaB and Notch1 expression with tumor-induced lymphangiogenesis. RESULTS: Chi-square tests revealed that NF-kappaB and Notch1 expression in ESCC tissues were significant associated with lymph node metastasis, LVD, podoplanin, and VEGF-C expression. Strong expression of NF-kappaB, but weak expression of Notch1, was observed in tumor tissues with lymph nodes involvement (P < 0.05 for both). The mean histoscores of LVD, podoplanin, and VEGF-C staining were higher in high-NF-kappaB-expressing tissue than in low-expressing tissue (P < 0.05 for each). In contrast, the mean histoscores of LVD and VEGF-C staining were lower in high-Notch1-expressing tissue than in low-expressing tissue (P < 0.05 for both). A multiple factors analysis of LVD and VEGF-C further demonstrated that LVD and VEGF-C status were significantly correlated with NF-kappaB and Notch1 expression in tumors. NF-kappaB and Notch1 expression were also significantly inversely correlated (P < 0.05). CONCLUSION: These results suggest that different patterns of NF-kappaB and Notch1 signaling contribute to lymph nodes metastasis and tumor-induced lymphangiogenesis of ESCC, and reveal that up-regulation of NF-kappaB is associated with down-regulation of Notch1 in tumor tissue.