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21 January 2018 : Laboratory Research  

High CXC Chemokine Ligand 16 (CXCL16) Expression Promotes Proliferation and Metastasis of Lung Cancer via Regulating the NF-κB Pathway

Kun Liang1ABCDEF, Yanru Liu2BC, Dun Eer2D, Jingbin Liu3E, Fan Yang3F, Ke Hu1AG*

DOI: 10.12659/MSM.906230

Med Sci Monit 2018; 24: LBR405-411

Abstract

BACKGROUND: CXC chemokine ligand 16 (CXCL16) is a soluble chemokine with a transmembrane domain, playing an important role in inflammatory regulation. NF-κB has a critical role in tumor progression. Recent studies focused on the effect of CXCL16 on tumor progression. However, few reports showed the influence of CXCL16 on lung cancer, especially in regulating NF-κB activity. Here we investigated CXCL16 expression and its clinical significance in lung cancer, as well as the effect on lung cancer cell biological characteristics by regulating NF-κB.

MATERIAL AND METHODS: CXCL16 expression in lung cancer was detected and its associations with clinical characteristics were analyzed. Proliferation and invasion of A549 and PC-9 cells was measured before and after silencing CXCL16 or inhibiting the NF-κB pathway, separately.

RESULTS: The positive rate of CXCL16 in lung cancer tissue was significantly higher than that in adjacent tissue, and that in patients with lymphatic metastasis was significantly higher than that in patients without (all, P<0.05). The positive rate of CXCL16 was significantly (P<0.05) positively corrected with poor prognosis of lung cancer. Silencing CXCL16 not only suppressed proliferation and invasion of A549 and PC-9 cells, but also significantly (P<0.05) inhibited c-Rel, p105, and Rel-B in the NF-κB pathway. Inhibiting NF-κB also suppressed proliferation and invasion of A549 and PC-9 cells, which was similar to the results after silencing CXCL16.

CONCLUSIONS: Enhanced CXCL16 expression in lung cancer tissue promoted the proliferation and invasion of lung cancer cells. CXCL16 might promote proliferation and invasion of lung cancer by regulating the NF-κB pathway.

Keywords: Chemokines, CXC

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750