Publication date: November 2017
Source:European Journal of Cancer, Volume 85
Author(s): Po-Lin Lin, Tzu-Chin Wu, De-Wei Wu, Lee Wang, Chi-Yi Chen, Huei Lee
High programmed cell death 1 ligand 1 (PD-L1) expression in tumour tissues was associated with poor outcomes in non–small cell lung cancer (NSCLC) due to evasion of tumour immune surveillance. However, the role of PD-L1 in tumour invasion and resistance to tyrosine kinase inhibitor (TKI) treatments is not fully understood. Here, we provide evidence to support the involvement of PD-L1 expression in the invasiveness and TKI resistance in NSCLC cells by increased Bcl-2-associated athanogene-1 (BAG-1) expression. The upregulation of BAG-1 transcription by PD-L1 was verified by constructing the BAG-1 promoters using the polymerase chain reaction (PCR) and deletion mutations for luciferase reporter assays. The results indicated that C/EBPβ phosphorylation by extracellular signal-regulated kinase (ERK) signalling was responsible for PD-L1-mediated BAG-1 transcription. Mechanistically, the PD-L1-induced BAG-1 expression reciprocally increased PD-L1 expression due to persistent activation of ERK signalling, and it consequently conferred TKI resistance in NSCLC cells. The mechanistic action of this cell model was further confirmed by an animal model, affirming that PD-L1 conferred tumour invasiveness and TKI resistance via persistent activation of ERK signalling by the PD-L1/BAG-1 axis. We therefore suggest a combination of an ERK inhibitor with a TKI as a potential strategy for conquering PD-L1-mediated tumour invasion and TKI resistance in NSCLC patients whose tumours harbour high PD-L1/high BAG-1 expression.
http://ift.tt/2wfPdGc
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- Contaminant characteristics and environmental risk...
- Stability of BiFeO 3 nanoparticles via microwave-a...
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- Does fear extinction in the laboratory predict out...
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- Response to “Re: A Systematic Review and Meta-anal...
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