title: Different patterns of NF-κB and Notch1 signaling contribute to tumor-induced lymphangiogenesis of esophageal squamous cell carcinoma.
abstract: 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-κB and Notch1 signaling to lymph node involvement and tumor-induced lymphangiogenesis in ESCC.
  
  
  METHODS
  NF-κB and Notch1 expression in 60 tissue samples of ESCC were assessed by immunohistochemical staining. The correlations of NF-κB 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-κB and Notch1 expression with tumor-induced lymphangiogenesis.
  
  
  RESULTS
  Chi-square tests revealed that NF-κB and Notch1 expression in ESCC tissues were significant associated with lymph node metastasis, LVD, podoplanin, and VEGF-C expression. Strong expression of NF-κB, 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-κB-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-κB and Notch1 expression in tumors. NF-κB and Notch1 expression were also significantly inversely correlated (P < 0.05).
  
  
  CONCLUSIONS
  These results suggest that different patterns of NF-κB and Notch1 signaling contribute to lymph nodes metastasis and tumor-induced lymphangiogenesis of ESCC, and reveal that up-regulation of NF-κB is associated with down-regulation of Notch1 in tumor tissue.
authors.affiliation: Department of Thoracic Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou (510080), Guangdong, People's Republic of China.
authors.forename: Chunhua
authors.initials: C
authors.lastname: Su
authors.forename: Zhenguang
authors.initials: Z
authors.lastname: Chen
authors.forename: Honghe
authors.initials: H
authors.lastname: Luo
authors.forename: Yihua
authors.initials: Y
authors.lastname: Su
authors.forename: Wangkai
authors.initials: W
authors.lastname: Liu
authors.forename: Lie
authors.initials: L
authors.lastname: Cai
authors.forename: Tao
authors.initials: T
authors.lastname: Wang
authors.forename: Yiyan
authors.initials: Y
authors.lastname: Lei
authors.forename: Beilong
authors.initials: B
authors.lastname: Zhong
mesh_terms: D000328:Adult; D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000235:genetics / Q000378:metabolism*; D004938:Esophageal Neoplasms / Q000235:genetics / Q000378:metabolism*; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008198:Lymph Nodes / Q000473:pathology; D042583:Lymphangiogenesis / Q000235:genetics; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D016328:NF-kappa B / Q000235:genetics / Q000378:metabolism*; D009367:Neoplasm Staging; D051881:Receptor, Notch1 / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction; D042582:Vascular Endothelial Growth Factor C / Q000378:metabolism
chemical_list: D016328:NF-kappa B; D051881:Receptor, Notch1; D042582:Vascular Endothelial Growth Factor C