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Lymphotoxin‐α promotes tumor angiogenesis in HNSCC by modulating glycolysis in a PFKFB3‐dependent manner
Author(s) -
Yang JieGang,
Wang WeiMing,
Xia HouFu,
Yu ZiLi,
Li HuiMin,
Ren JianGang,
Chen Gang,
Wang BeiKe,
Jia Jun,
Zhang Wei,
Zhao YiFang
Publication year - 2019
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.32221
Subject(s) - lymphotoxin , angiogenesis , glycolysis , cancer research , biology , medicine , microbiology and biotechnology , immunology , metabolism , cytokine
Tumor angiogenesis is critical for tumor progression as the new blood vessels supply nutrients and facilitate metastasis. Previous studies indicate tumor associated lymphocytes, including B cells and T cells, contribute to tumor angiogenesis and tumor progression. The present study aims to identify the function of Lymphotoxin‐α (LT‐α), which is secreted by the activated lymphocytes, in the tumor angiogenesis of head and neck squamous cell carcinoma (HNSCC). The coculture system between HNSCC cell line Cal27 and primary lymphocytes revealed that tumor cells promoted the LT‐α secretion in the cocultured lymphocytes. In vitro data further demonstrated that LT‐α promoted the proliferation, migration and tube formation of human umbilical vein endothelial cells (HUVECs) by enhancing the PFKFB3‐mediated glycolytic flux. Genetic and pharmacological inhibition of PFKFB3 suppressed the enhanced proliferation and migration of HUVECs. We further identified that LT‐α induced PFKFB3 expression was dependent on the TNFR/NF‐κB signaling pathway. In addition, we proved that PFKFB3 blockade decreased the density of CD31 positive blood vessels in HNSCC xenografts. Finally, the results from the human HNSCC tissue array revealed that the expression of LT‐α in HNSCC samples positively correlated with microvessel density, lymphocytes infiltration and endothelial PFKFB3 expression. In conclusion, infiltrated lymphocyte secreted LT‐α enhances the glycolysis of ECs in a PFKFB3‐dependent manner through the classical NF‐κB pathway and promotes the proliferation and migration of ECs, which may contribute to the aberrant angiogenesis in HNSCCs. Our study suggests that PFKFB3 blockade is a promising therapeutic approach for HNSCCs by targeting tumor angiogenesis.